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Diffstat (limited to 'Godeps/_workspace/src')
41 files changed, 7084 insertions, 0 deletions
diff --git a/Godeps/_workspace/src/code.google.com/p/graphics-go/graphics/Makefile b/Godeps/_workspace/src/code.google.com/p/graphics-go/graphics/Makefile new file mode 100644 index 000000000..28a06f0e8 --- /dev/null +++ b/Godeps/_workspace/src/code.google.com/p/graphics-go/graphics/Makefile @@ -0,0 +1,15 @@ +# Copyright 2011 The Graphics-Go Authors. All rights reserved. +# Use of this source code is governed by a BSD-style +# license that can be found in the LICENSE file. + +include $(GOROOT)/src/Make.inc + +TARG=code.google.com/p/graphics-go/graphics +GOFILES=\ + affine.go\ + blur.go\ + rotate.go\ + scale.go\ + thumbnail.go\ + +include $(GOROOT)/src/Make.pkg diff --git a/Godeps/_workspace/src/code.google.com/p/graphics-go/graphics/affine.go b/Godeps/_workspace/src/code.google.com/p/graphics-go/graphics/affine.go new file mode 100644 index 000000000..0ac2ec9da --- /dev/null +++ b/Godeps/_workspace/src/code.google.com/p/graphics-go/graphics/affine.go @@ -0,0 +1,174 @@ +// Copyright 2011 The Graphics-Go Authors. All rights reserved. +// Use of this source code is governed by a BSD-style +// license that can be found in the LICENSE file. + +package graphics + +import ( + "code.google.com/p/graphics-go/graphics/interp" + "errors" + "image" + "image/draw" + "math" +) + +// I is the identity Affine transform matrix. +var I = Affine{ + 1, 0, 0, + 0, 1, 0, + 0, 0, 1, +} + +// Affine is a 3x3 2D affine transform matrix. +// M(i,j) is Affine[i*3+j]. +type Affine [9]float64 + +// Mul returns the multiplication of two affine transform matrices. +func (a Affine) Mul(b Affine) Affine { + return Affine{ + a[0]*b[0] + a[1]*b[3] + a[2]*b[6], + a[0]*b[1] + a[1]*b[4] + a[2]*b[7], + a[0]*b[2] + a[1]*b[5] + a[2]*b[8], + a[3]*b[0] + a[4]*b[3] + a[5]*b[6], + a[3]*b[1] + a[4]*b[4] + a[5]*b[7], + a[3]*b[2] + a[4]*b[5] + a[5]*b[8], + a[6]*b[0] + a[7]*b[3] + a[8]*b[6], + a[6]*b[1] + a[7]*b[4] + a[8]*b[7], + a[6]*b[2] + a[7]*b[5] + a[8]*b[8], + } +} + +func (a Affine) transformRGBA(dst *image.RGBA, src *image.RGBA, i interp.RGBA) error { + srcb := src.Bounds() + b := dst.Bounds() + for y := b.Min.Y; y < b.Max.Y; y++ { + for x := b.Min.X; x < b.Max.X; x++ { + sx, sy := a.pt(x, y) + if inBounds(srcb, sx, sy) { + c := i.RGBA(src, sx, sy) + off := (y-dst.Rect.Min.Y)*dst.Stride + (x-dst.Rect.Min.X)*4 + dst.Pix[off+0] = c.R + dst.Pix[off+1] = c.G + dst.Pix[off+2] = c.B + dst.Pix[off+3] = c.A + } + } + } + return nil +} + +// Transform applies the affine transform to src and produces dst. +func (a Affine) Transform(dst draw.Image, src image.Image, i interp.Interp) error { + if dst == nil { + return errors.New("graphics: dst is nil") + } + if src == nil { + return errors.New("graphics: src is nil") + } + + // RGBA fast path. + dstRGBA, dstOk := dst.(*image.RGBA) + srcRGBA, srcOk := src.(*image.RGBA) + interpRGBA, interpOk := i.(interp.RGBA) + if dstOk && srcOk && interpOk { + return a.transformRGBA(dstRGBA, srcRGBA, interpRGBA) + } + + srcb := src.Bounds() + b := dst.Bounds() + for y := b.Min.Y; y < b.Max.Y; y++ { + for x := b.Min.X; x < b.Max.X; x++ { + sx, sy := a.pt(x, y) + if inBounds(srcb, sx, sy) { + dst.Set(x, y, i.Interp(src, sx, sy)) + } + } + } + return nil +} + +func inBounds(b image.Rectangle, x, y float64) bool { + if x < float64(b.Min.X) || x >= float64(b.Max.X) { + return false + } + if y < float64(b.Min.Y) || y >= float64(b.Max.Y) { + return false + } + return true +} + +func (a Affine) pt(x0, y0 int) (x1, y1 float64) { + fx := float64(x0) + 0.5 + fy := float64(y0) + 0.5 + x1 = fx*a[0] + fy*a[1] + a[2] + y1 = fx*a[3] + fy*a[4] + a[5] + return x1, y1 +} + +// TransformCenter applies the affine transform to src and produces dst. +// Equivalent to +// a.CenterFit(dst, src).Transform(dst, src, i). +func (a Affine) TransformCenter(dst draw.Image, src image.Image, i interp.Interp) error { + if dst == nil { + return errors.New("graphics: dst is nil") + } + if src == nil { + return errors.New("graphics: src is nil") + } + + return a.CenterFit(dst.Bounds(), src.Bounds()).Transform(dst, src, i) +} + +// Scale produces a scaling transform of factors x and y. +func (a Affine) Scale(x, y float64) Affine { + return a.Mul(Affine{ + 1 / x, 0, 0, + 0, 1 / y, 0, + 0, 0, 1, + }) +} + +// Rotate produces a clockwise rotation transform of angle, in radians. +func (a Affine) Rotate(angle float64) Affine { + s, c := math.Sincos(angle) + return a.Mul(Affine{ + +c, +s, +0, + -s, +c, +0, + +0, +0, +1, + }) +} + +// Shear produces a shear transform by the slopes x and y. +func (a Affine) Shear(x, y float64) Affine { + d := 1 - x*y + return a.Mul(Affine{ + +1 / d, -x / d, 0, + -y / d, +1 / d, 0, + 0, 0, 1, + }) +} + +// Translate produces a translation transform with pixel distances x and y. +func (a Affine) Translate(x, y float64) Affine { + return a.Mul(Affine{ + 1, 0, -x, + 0, 1, -y, + 0, 0, +1, + }) +} + +// Center produces the affine transform, centered around the provided point. +func (a Affine) Center(x, y float64) Affine { + return I.Translate(-x, -y).Mul(a).Translate(x, y) +} + +// CenterFit produces the affine transform, centered around the rectangles. +// It is equivalent to +// I.Translate(-<center of src>).Mul(a).Translate(<center of dst>) +func (a Affine) CenterFit(dst, src image.Rectangle) Affine { + dx := float64(dst.Min.X) + float64(dst.Dx())/2 + dy := float64(dst.Min.Y) + float64(dst.Dy())/2 + sx := float64(src.Min.X) + float64(src.Dx())/2 + sy := float64(src.Min.Y) + float64(src.Dy())/2 + return I.Translate(-sx, -sy).Mul(a).Translate(dx, dy) +} diff --git a/Godeps/_workspace/src/code.google.com/p/graphics-go/graphics/blur.go b/Godeps/_workspace/src/code.google.com/p/graphics-go/graphics/blur.go new file mode 100644 index 000000000..9a54d5ad5 --- /dev/null +++ b/Godeps/_workspace/src/code.google.com/p/graphics-go/graphics/blur.go @@ -0,0 +1,68 @@ +// Copyright 2011 The Graphics-Go Authors. All rights reserved. +// Use of this source code is governed by a BSD-style +// license that can be found in the LICENSE file. + +package graphics + +import ( + "code.google.com/p/graphics-go/graphics/convolve" + "errors" + "image" + "image/draw" + "math" +) + +// DefaultStdDev is the default blurring parameter. +var DefaultStdDev = 0.5 + +// BlurOptions are the blurring parameters. +// StdDev is the standard deviation of the normal, higher is blurrier. +// Size is the size of the kernel. If zero, it is set to Ceil(6 * StdDev). +type BlurOptions struct { + StdDev float64 + Size int +} + +// Blur produces a blurred version of the image, using a Gaussian blur. +func Blur(dst draw.Image, src image.Image, opt *BlurOptions) error { + if dst == nil { + return errors.New("graphics: dst is nil") + } + if src == nil { + return errors.New("graphics: src is nil") + } + + sd := DefaultStdDev + size := 0 + + if opt != nil { + sd = opt.StdDev + size = opt.Size + } + + if size < 1 { + size = int(math.Ceil(sd * 6)) + } + + kernel := make([]float64, 2*size+1) + for i := 0; i <= size; i++ { + x := float64(i) / sd + x = math.Pow(1/math.SqrtE, x*x) + kernel[size-i] = x + kernel[size+i] = x + } + + // Normalize the weights to sum to 1.0. + kSum := 0.0 + for _, k := range kernel { + kSum += k + } + for i, k := range kernel { + kernel[i] = k / kSum + } + + return convolve.Convolve(dst, src, &convolve.SeparableKernel{ + X: kernel, + Y: kernel, + }) +} diff --git a/Godeps/_workspace/src/code.google.com/p/graphics-go/graphics/blur_test.go b/Godeps/_workspace/src/code.google.com/p/graphics-go/graphics/blur_test.go new file mode 100644 index 000000000..1d84fa604 --- /dev/null +++ b/Godeps/_workspace/src/code.google.com/p/graphics-go/graphics/blur_test.go @@ -0,0 +1,207 @@ +// Copyright 2011 The Graphics-Go Authors. All rights reserved. +// Use of this source code is governed by a BSD-style +// license that can be found in the LICENSE file. + +package graphics + +import ( + "code.google.com/p/graphics-go/graphics/graphicstest" + "image" + "image/color" + "testing" + + _ "image/png" +) + +var blurOneColorTests = []transformOneColorTest{ + { + "1x1-blank", 1, 1, 1, 1, + &BlurOptions{0.83, 1}, + []uint8{0xff}, + []uint8{0xff}, + }, + { + "1x1-spreadblank", 1, 1, 1, 1, + &BlurOptions{0.83, 2}, + []uint8{0xff}, + []uint8{0xff}, + }, + { + "3x3-blank", 3, 3, 3, 3, + &BlurOptions{0.83, 2}, + []uint8{ + 0xff, 0xff, 0xff, + 0xff, 0xff, 0xff, + 0xff, 0xff, 0xff, + }, + []uint8{ + 0xff, 0xff, 0xff, + 0xff, 0xff, 0xff, + 0xff, 0xff, 0xff, + }, + }, + { + "3x3-dot", 3, 3, 3, 3, + &BlurOptions{0.34, 1}, + []uint8{ + 0x00, 0x00, 0x00, + 0x00, 0xff, 0x00, + 0x00, 0x00, 0x00, + }, + []uint8{ + 0x00, 0x03, 0x00, + 0x03, 0xf2, 0x03, + 0x00, 0x03, 0x00, + }, + }, + { + "5x5-dot", 5, 5, 5, 5, + &BlurOptions{0.34, 1}, + []uint8{ + 0x00, 0x00, 0x00, 0x00, 0x00, + 0x00, 0x00, 0x00, 0x00, 0x00, + 0x00, 0x00, 0xff, 0x00, 0x00, + 0x00, 0x00, 0x00, 0x00, 0x00, + 0x00, 0x00, 0x00, 0x00, 0x00, + }, + []uint8{ + 0x00, 0x00, 0x00, 0x00, 0x00, + 0x00, 0x00, 0x03, 0x00, 0x00, + 0x00, 0x03, 0xf2, 0x03, 0x00, + 0x00, 0x00, 0x03, 0x00, 0x00, + 0x00, 0x00, 0x00, 0x00, 0x00, + }, + }, + { + "5x5-dot-spread", 5, 5, 5, 5, + &BlurOptions{0.85, 1}, + []uint8{ + 0x00, 0x00, 0x00, 0x00, 0x00, + 0x00, 0x00, 0x00, 0x00, 0x00, + 0x00, 0x00, 0xff, 0x00, 0x00, + 0x00, 0x00, 0x00, 0x00, 0x00, + 0x00, 0x00, 0x00, 0x00, 0x00, + }, + []uint8{ + 0x00, 0x00, 0x00, 0x00, 0x00, + 0x00, 0x10, 0x20, 0x10, 0x00, + 0x00, 0x20, 0x40, 0x20, 0x00, + 0x00, 0x10, 0x20, 0x10, 0x00, + 0x00, 0x00, 0x00, 0x00, 0x00, + }, + }, + { + "4x4-box", 4, 4, 4, 4, + &BlurOptions{0.34, 1}, + []uint8{ + 0x00, 0x00, 0x00, 0x00, + 0x00, 0xff, 0xff, 0x00, + 0x00, 0xff, 0xff, 0x00, + 0x00, 0x00, 0x00, 0x00, + }, + []uint8{ + 0x00, 0x03, 0x03, 0x00, + 0x03, 0xf8, 0xf8, 0x03, + 0x03, 0xf8, 0xf8, 0x03, + 0x00, 0x03, 0x03, 0x00, + }, + }, + { + "5x5-twodots", 5, 5, 5, 5, + &BlurOptions{0.34, 1}, + []uint8{ + 0x00, 0x00, 0x00, 0x00, 0x00, + 0x00, 0x00, 0x00, 0x00, 0x00, + 0x00, 0x96, 0x00, 0x96, 0x00, + 0x00, 0x00, 0x00, 0x00, 0x00, + 0x00, 0x00, 0x00, 0x00, 0x00, + }, + []uint8{ + 0x00, 0x00, 0x00, 0x00, 0x00, + 0x00, 0x02, 0x00, 0x02, 0x00, + 0x02, 0x8e, 0x04, 0x8e, 0x02, + 0x00, 0x02, 0x00, 0x02, 0x00, + 0x00, 0x00, 0x00, 0x00, 0x00, + }, + }, +} + +func TestBlurOneColor(t *testing.T) { + for _, oc := range blurOneColorTests { + dst := oc.newDst() + src := oc.newSrc() + opt := oc.opt.(*BlurOptions) + if err := Blur(dst, src, opt); err != nil { + t.Fatal(err) + } + + if !checkTransformTest(t, &oc, dst) { + continue + } + } +} + +func TestBlurEmpty(t *testing.T) { + empty := image.NewRGBA(image.Rect(0, 0, 0, 0)) + if err := Blur(empty, empty, nil); err != nil { + t.Fatal(err) + } +} + +func TestBlurGopher(t *testing.T) { + src, err := graphicstest.LoadImage("../testdata/gopher.png") + if err != nil { + t.Fatal(err) + } + + dst := image.NewRGBA(src.Bounds()) + if err = Blur(dst, src, &BlurOptions{StdDev: 1.1}); err != nil { + t.Fatal(err) + } + + cmp, err := graphicstest.LoadImage("../testdata/gopher-blur.png") + if err != nil { + t.Fatal(err) + } + err = graphicstest.ImageWithinTolerance(dst, cmp, 0x101) + if err != nil { + t.Fatal(err) + } +} + +func benchBlur(b *testing.B, bounds image.Rectangle) { + b.StopTimer() + + // Construct a fuzzy image. + src := image.NewRGBA(bounds) + for y := bounds.Min.Y; y < bounds.Max.Y; y++ { + for x := bounds.Min.X; x < bounds.Max.X; x++ { + src.SetRGBA(x, y, color.RGBA{ + uint8(5 * x % 0x100), + uint8(7 * y % 0x100), + uint8((7*x + 5*y) % 0x100), + 0xff, + }) + } + } + dst := image.NewRGBA(bounds) + + b.StartTimer() + for i := 0; i < b.N; i++ { + Blur(dst, src, &BlurOptions{0.84, 3}) + } +} + +func BenchmarkBlur400x400x3(b *testing.B) { + benchBlur(b, image.Rect(0, 0, 400, 400)) +} + +// Exactly twice the pixel count of 400x400. +func BenchmarkBlur400x800x3(b *testing.B) { + benchBlur(b, image.Rect(0, 0, 400, 800)) +} + +// Exactly twice the pixel count of 400x800 +func BenchmarkBlur400x1600x3(b *testing.B) { + benchBlur(b, image.Rect(0, 0, 400, 1600)) +} diff --git a/Godeps/_workspace/src/code.google.com/p/graphics-go/graphics/convolve/Makefile b/Godeps/_workspace/src/code.google.com/p/graphics-go/graphics/convolve/Makefile new file mode 100644 index 000000000..a5691fa30 --- /dev/null +++ b/Godeps/_workspace/src/code.google.com/p/graphics-go/graphics/convolve/Makefile @@ -0,0 +1,11 @@ +# Copyright 2011 The Graphics-Go Authors. All rights reserved. +# Use of this source code is governed by a BSD-style +# license that can be found in the LICENSE file. + +include $(GOROOT)/src/Make.inc + +TARG=code.google.com/p/graphics-go/graphics/convolve +GOFILES=\ + convolve.go\ + +include $(GOROOT)/src/Make.pkg diff --git a/Godeps/_workspace/src/code.google.com/p/graphics-go/graphics/convolve/convolve.go b/Godeps/_workspace/src/code.google.com/p/graphics-go/graphics/convolve/convolve.go new file mode 100644 index 000000000..da69496d0 --- /dev/null +++ b/Godeps/_workspace/src/code.google.com/p/graphics-go/graphics/convolve/convolve.go @@ -0,0 +1,274 @@ +// Copyright 2011 The Graphics-Go Authors. All rights reserved. +// Use of this source code is governed by a BSD-style +// license that can be found in the LICENSE file. + +package convolve + +import ( + "errors" + "fmt" + "image" + "image/draw" + "math" +) + +// clamp clamps x to the range [x0, x1]. +func clamp(x, x0, x1 float64) float64 { + if x < x0 { + return x0 + } + if x > x1 { + return x1 + } + return x +} + +// Kernel is a square matrix that defines a convolution. +type Kernel interface { + // Weights returns the square matrix of weights in row major order. + Weights() []float64 +} + +// SeparableKernel is a linearly separable, square convolution kernel. +// X and Y are the per-axis weights. Each slice must be the same length, and +// have an odd length. The middle element of each slice is the weight for the +// central pixel. For example, the horizontal Sobel kernel is: +// sobelX := &SeparableKernel{ +// X: []float64{-1, 0, +1}, +// Y: []float64{1, 2, 1}, +// } +type SeparableKernel struct { + X, Y []float64 +} + +func (k *SeparableKernel) Weights() []float64 { + n := len(k.X) + w := make([]float64, n*n) + for y := 0; y < n; y++ { + for x := 0; x < n; x++ { + w[y*n+x] = k.X[x] * k.Y[y] + } + } + return w +} + +// fullKernel is a square convolution kernel. +type fullKernel []float64 + +func (k fullKernel) Weights() []float64 { return k } + +func kernelSize(w []float64) (size int, err error) { + size = int(math.Sqrt(float64(len(w)))) + if size*size != len(w) { + return 0, errors.New("graphics: kernel is not square") + } + if size%2 != 1 { + return 0, errors.New("graphics: kernel size is not odd") + } + return size, nil +} + +// NewKernel returns a square convolution kernel. +func NewKernel(w []float64) (Kernel, error) { + if _, err := kernelSize(w); err != nil { + return nil, err + } + return fullKernel(w), nil +} + +func convolveRGBASep(dst *image.RGBA, src image.Image, k *SeparableKernel) error { + if len(k.X) != len(k.Y) { + return fmt.Errorf("graphics: kernel not square (x %d, y %d)", len(k.X), len(k.Y)) + } + if len(k.X)%2 != 1 { + return fmt.Errorf("graphics: kernel length (%d) not odd", len(k.X)) + } + radius := (len(k.X) - 1) / 2 + + // buf holds the result of vertically blurring src. + bounds := dst.Bounds() + width, height := bounds.Dx(), bounds.Dy() + buf := make([]float64, width*height*4) + for y := bounds.Min.Y; y < bounds.Max.Y; y++ { + for x := bounds.Min.X; x < bounds.Max.X; x++ { + var r, g, b, a float64 + // k0 is the kernel weight for the center pixel. This may be greater + // than kernel[0], near the boundary of the source image, to avoid + // vignetting. + k0 := k.X[radius] + + // Add the pixels from above. + for i := 1; i <= radius; i++ { + f := k.Y[radius-i] + if y-i < bounds.Min.Y { + k0 += f + } else { + or, og, ob, oa := src.At(x, y-i).RGBA() + r += float64(or>>8) * f + g += float64(og>>8) * f + b += float64(ob>>8) * f + a += float64(oa>>8) * f + } + } + + // Add the pixels from below. + for i := 1; i <= radius; i++ { + f := k.Y[radius+i] + if y+i >= bounds.Max.Y { + k0 += f + } else { + or, og, ob, oa := src.At(x, y+i).RGBA() + r += float64(or>>8) * f + g += float64(og>>8) * f + b += float64(ob>>8) * f + a += float64(oa>>8) * f + } + } + + // Add the central pixel. + or, og, ob, oa := src.At(x, y).RGBA() + r += float64(or>>8) * k0 + g += float64(og>>8) * k0 + b += float64(ob>>8) * k0 + a += float64(oa>>8) * k0 + + // Write to buf. + o := (y-bounds.Min.Y)*width*4 + (x-bounds.Min.X)*4 + buf[o+0] = r + buf[o+1] = g + buf[o+2] = b + buf[o+3] = a + } + } + + // dst holds the result of horizontally blurring buf. + for y := 0; y < height; y++ { + for x := 0; x < width; x++ { + var r, g, b, a float64 + k0, off := k.X[radius], y*width*4+x*4 + + // Add the pixels from the left. + for i := 1; i <= radius; i++ { + f := k.X[radius-i] + if x-i < 0 { + k0 += f + } else { + o := off - i*4 + r += buf[o+0] * f + g += buf[o+1] * f + b += buf[o+2] * f + a += buf[o+3] * f + } + } + + // Add the pixels from the right. + for i := 1; i <= radius; i++ { + f := k.X[radius+i] + if x+i >= width { + k0 += f + } else { + o := off + i*4 + r += buf[o+0] * f + g += buf[o+1] * f + b += buf[o+2] * f + a += buf[o+3] * f + } + } + + // Add the central pixel. + r += buf[off+0] * k0 + g += buf[off+1] * k0 + b += buf[off+2] * k0 + a += buf[off+3] * k0 + + // Write to dst, clamping to the range [0, 255]. + dstOff := (y-dst.Rect.Min.Y)*dst.Stride + (x-dst.Rect.Min.X)*4 + dst.Pix[dstOff+0] = uint8(clamp(r+0.5, 0, 255)) + dst.Pix[dstOff+1] = uint8(clamp(g+0.5, 0, 255)) + dst.Pix[dstOff+2] = uint8(clamp(b+0.5, 0, 255)) + dst.Pix[dstOff+3] = uint8(clamp(a+0.5, 0, 255)) + } + } + + return nil +} + +func convolveRGBA(dst *image.RGBA, src image.Image, k Kernel) error { + b := dst.Bounds() + bs := src.Bounds() + w := k.Weights() + size, err := kernelSize(w) + if err != nil { + return err + } + radius := (size - 1) / 2 + + for y := b.Min.Y; y < b.Max.Y; y++ { + for x := b.Min.X; x < b.Max.X; x++ { + if !image.Pt(x, y).In(bs) { + continue + } + + var r, g, b, a, adj float64 + for cy := y - radius; cy <= y+radius; cy++ { + for cx := x - radius; cx <= x+radius; cx++ { + factor := w[(cy-y+radius)*size+cx-x+radius] + if !image.Pt(cx, cy).In(bs) { + adj += factor + } else { + sr, sg, sb, sa := src.At(cx, cy).RGBA() + r += float64(sr>>8) * factor + g += float64(sg>>8) * factor + b += float64(sb>>8) * factor + a += float64(sa>>8) * factor + } + } + } + + if adj != 0 { + sr, sg, sb, sa := src.At(x, y).RGBA() + r += float64(sr>>8) * adj + g += float64(sg>>8) * adj + b += float64(sb>>8) * adj + a += float64(sa>>8) * adj + } + + off := (y-dst.Rect.Min.Y)*dst.Stride + (x-dst.Rect.Min.X)*4 + dst.Pix[off+0] = uint8(clamp(r+0.5, 0, 0xff)) + dst.Pix[off+1] = uint8(clamp(g+0.5, 0, 0xff)) + dst.Pix[off+2] = uint8(clamp(b+0.5, 0, 0xff)) + dst.Pix[off+3] = uint8(clamp(a+0.5, 0, 0xff)) + } + } + + return nil +} + +// Convolve produces dst by applying the convolution kernel k to src. +func Convolve(dst draw.Image, src image.Image, k Kernel) (err error) { + if dst == nil || src == nil || k == nil { + return nil + } + + b := dst.Bounds() + dstRgba, ok := dst.(*image.RGBA) + if !ok { + dstRgba = image.NewRGBA(b) + } + + switch k := k.(type) { + case *SeparableKernel: + err = convolveRGBASep(dstRgba, src, k) + default: + err = convolveRGBA(dstRgba, src, k) + } + + if err != nil { + return err + } + + if !ok { + draw.Draw(dst, b, dstRgba, b.Min, draw.Src) + } + return nil +} diff --git a/Godeps/_workspace/src/code.google.com/p/graphics-go/graphics/convolve/convolve_test.go b/Godeps/_workspace/src/code.google.com/p/graphics-go/graphics/convolve/convolve_test.go new file mode 100644 index 000000000..f34d7afc8 --- /dev/null +++ b/Godeps/_workspace/src/code.google.com/p/graphics-go/graphics/convolve/convolve_test.go @@ -0,0 +1,78 @@ +// Copyright 2011 The Graphics-Go Authors. All rights reserved. +// Use of this source code is governed by a BSD-style +// license that can be found in the LICENSE file. + +package convolve + +import ( + "code.google.com/p/graphics-go/graphics/graphicstest" + "image" + "reflect" + "testing" + + _ "image/png" +) + +func TestSeparableWeights(t *testing.T) { + sobelXFull := []float64{ + -1, 0, 1, + -2, 0, 2, + -1, 0, 1, + } + sobelXSep := &SeparableKernel{ + X: []float64{-1, 0, +1}, + Y: []float64{1, 2, 1}, + } + w := sobelXSep.Weights() + if !reflect.DeepEqual(w, sobelXFull) { + t.Errorf("got %v want %v", w, sobelXFull) + } +} + +func TestConvolve(t *testing.T) { + kernFull, err := NewKernel([]float64{ + 0, 0, 0, + 1, 1, 1, + 0, 0, 0, + }) + if err != nil { + t.Fatal(err) + } + + kernSep := &SeparableKernel{ + X: []float64{1, 1, 1}, + Y: []float64{0, 1, 0}, + } + + src, err := graphicstest.LoadImage("../../testdata/gopher.png") + if err != nil { + t.Fatal(err) + } + b := src.Bounds() + + sep := image.NewRGBA(b) + if err = Convolve(sep, src, kernSep); err != nil { + t.Fatal(err) + } + + full := image.NewRGBA(b) + Convolve(full, src, kernFull) + + err = graphicstest.ImageWithinTolerance(sep, full, 0x101) + if err != nil { + t.Fatal(err) + } +} + +func TestConvolveNil(t *testing.T) { + if err := Convolve(nil, nil, nil); err != nil { + t.Fatal(err) + } +} + +func TestConvolveEmpty(t *testing.T) { + empty := image.NewRGBA(image.Rect(0, 0, 0, 0)) + if err := Convolve(empty, empty, nil); err != nil { + t.Fatal(err) + } +} diff --git a/Godeps/_workspace/src/code.google.com/p/graphics-go/graphics/detect/Makefile b/Godeps/_workspace/src/code.google.com/p/graphics-go/graphics/detect/Makefile new file mode 100644 index 000000000..0b1c6cb3e --- /dev/null +++ b/Godeps/_workspace/src/code.google.com/p/graphics-go/graphics/detect/Makefile @@ -0,0 +1,15 @@ +# Copyright 2011 The Graphics-Go Authors. All rights reserved. +# Use of this source code is governed by a BSD-style +# license that can be found in the LICENSE file. + +include $(GOROOT)/src/Make.inc + +TARG=code.google.com/p/graphics-go/graphics +GOFILES=\ + detect.go\ + doc.go\ + integral.go\ + opencv_parser.go\ + projector.go\ + +include $(GOROOT)/src/Make.pkg diff --git a/Godeps/_workspace/src/code.google.com/p/graphics-go/graphics/detect/detect.go b/Godeps/_workspace/src/code.google.com/p/graphics-go/graphics/detect/detect.go new file mode 100644 index 000000000..dde941cbe --- /dev/null +++ b/Godeps/_workspace/src/code.google.com/p/graphics-go/graphics/detect/detect.go @@ -0,0 +1,133 @@ +// Copyright 2011 The Graphics-Go Authors. All rights reserved. +// Use of this source code is governed by a BSD-style +// license that can be found in the LICENSE file. + +package detect + +import ( + "image" + "math" +) + +// Feature is a Haar-like feature. +type Feature struct { + Rect image.Rectangle + Weight float64 +} + +// Classifier is a set of features with a threshold. +type Classifier struct { + Feature []Feature + Threshold float64 + Left float64 + Right float64 +} + +// CascadeStage is a cascade of classifiers. +type CascadeStage struct { + Classifier []Classifier + Threshold float64 +} + +// Cascade is a degenerate tree of Haar-like classifiers. +type Cascade struct { + Stage []CascadeStage + Size image.Point +} + +// Match returns true if the full image is classified as an object. +func (c *Cascade) Match(m image.Image) bool { + return c.classify(newWindow(m)) +} + +// Find returns a set of areas of m that match the feature cascade c. +func (c *Cascade) Find(m image.Image) []image.Rectangle { + // TODO(crawshaw): Consider de-duping strategies. + matches := []image.Rectangle{} + w := newWindow(m) + + b := m.Bounds() + origScale := c.Size + for s := origScale; s.X < b.Dx() && s.Y < b.Dy(); s = s.Add(s.Div(10)) { + // translate region and classify + tx := image.Pt(s.X/10, 0) + ty := image.Pt(0, s.Y/10) + for r := image.Rect(0, 0, s.X, s.Y).Add(b.Min); r.In(b); r = r.Add(ty) { + for r1 := r; r1.In(b); r1 = r1.Add(tx) { + if c.classify(w.subWindow(r1)) { + matches = append(matches, r1) + } + } + } + } + return matches +} + +type window struct { + mi *integral + miSq *integral + rect image.Rectangle + invArea float64 + stdDev float64 +} + +func (w *window) init() { + w.invArea = 1 / float64(w.rect.Dx()*w.rect.Dy()) + mean := float64(w.mi.sum(w.rect)) * w.invArea + vr := float64(w.miSq.sum(w.rect))*w.invArea - mean*mean + if vr < 0 { + vr = 1 + } + w.stdDev = math.Sqrt(vr) +} + +func newWindow(m image.Image) *window { + mi, miSq := newIntegrals(m) + res := &window{ + mi: mi, + miSq: miSq, + rect: m.Bounds(), + } + res.init() + return res +} + +func (w *window) subWindow(r image.Rectangle) *window { + res := &window{ + mi: w.mi, + miSq: w.miSq, + rect: r, + } + res.init() + return res +} + +func (c *Classifier) classify(w *window, pr *projector) float64 { + s := 0.0 + for _, f := range c.Feature { + s += float64(w.mi.sum(pr.rect(f.Rect))) * f.Weight + } + s *= w.invArea // normalize to maintain scale invariance + if s < c.Threshold*w.stdDev { + return c.Left + } + return c.Right +} + +func (s *CascadeStage) classify(w *window, pr *projector) bool { + sum := 0.0 + for _, c := range s.Classifier { + sum += c.classify(w, pr) + } + return sum >= s.Threshold +} + +func (c *Cascade) classify(w *window) bool { + pr := newProjector(w.rect, image.Rectangle{image.Pt(0, 0), c.Size}) + for _, s := range c.Stage { + if !s.classify(w, pr) { + return false + } + } + return true +} diff --git a/Godeps/_workspace/src/code.google.com/p/graphics-go/graphics/detect/detect_test.go b/Godeps/_workspace/src/code.google.com/p/graphics-go/graphics/detect/detect_test.go new file mode 100644 index 000000000..8a2df113d --- /dev/null +++ b/Godeps/_workspace/src/code.google.com/p/graphics-go/graphics/detect/detect_test.go @@ -0,0 +1,77 @@ +// Copyright 2011 The Graphics-Go Authors. All rights reserved. +// Use of this source code is governed by a BSD-style +// license that can be found in the LICENSE file. + +package detect + +import ( + "image" + "image/draw" + "testing" +) + +var ( + c0 = Classifier{ + Feature: []Feature{ + Feature{Rect: image.Rect(0, 0, 3, 4), Weight: 4.0}, + }, + Threshold: 0.2, + Left: 0.8, + Right: 0.2, + } + c1 = Classifier{ + Feature: []Feature{ + Feature{Rect: image.Rect(3, 4, 4, 5), Weight: 4.0}, + }, + Threshold: 0.2, + Left: 0.8, + Right: 0.2, + } + c2 = Classifier{ + Feature: []Feature{ + Feature{Rect: image.Rect(0, 0, 1, 1), Weight: +4.0}, + Feature{Rect: image.Rect(0, 0, 2, 2), Weight: -1.0}, + }, + Threshold: 0.2, + Left: 0.8, + Right: 0.2, + } +) + +func TestClassifier(t *testing.T) { + m := image.NewGray(image.Rect(0, 0, 20, 20)) + b := m.Bounds() + draw.Draw(m, image.Rect(0, 0, 20, 20), image.White, image.ZP, draw.Src) + draw.Draw(m, image.Rect(3, 4, 4, 5), image.Black, image.ZP, draw.Src) + w := newWindow(m) + pr := newProjector(b, b) + + if res := c0.classify(w, pr); res != c0.Right { + t.Errorf("c0 got %f want %f", res, c0.Right) + } + if res := c1.classify(w, pr); res != c1.Left { + t.Errorf("c1 got %f want %f", res, c1.Left) + } + if res := c2.classify(w, pr); res != c1.Left { + t.Errorf("c2 got %f want %f", res, c1.Left) + } +} + +func TestClassifierScale(t *testing.T) { + m := image.NewGray(image.Rect(0, 0, 50, 50)) + b := m.Bounds() + draw.Draw(m, image.Rect(0, 0, 8, 10), image.White, b.Min, draw.Src) + draw.Draw(m, image.Rect(8, 10, 10, 13), image.Black, b.Min, draw.Src) + w := newWindow(m) + pr := newProjector(b, image.Rect(0, 0, 20, 20)) + + if res := c0.classify(w, pr); res != c0.Right { + t.Errorf("scaled c0 got %f want %f", res, c0.Right) + } + if res := c1.classify(w, pr); res != c1.Left { + t.Errorf("scaled c1 got %f want %f", res, c1.Left) + } + if res := c2.classify(w, pr); res != c1.Left { + t.Errorf("scaled c2 got %f want %f", res, c1.Left) + } +} diff --git a/Godeps/_workspace/src/code.google.com/p/graphics-go/graphics/detect/doc.go b/Godeps/_workspace/src/code.google.com/p/graphics-go/graphics/detect/doc.go new file mode 100644 index 000000000..a0f4e94cd --- /dev/null +++ b/Godeps/_workspace/src/code.google.com/p/graphics-go/graphics/detect/doc.go @@ -0,0 +1,31 @@ +// Copyright 2011 The Graphics-Go Authors. All rights reserved. +// Use of this source code is governed by a BSD-style +// license that can be found in the LICENSE file. + +/* +Package detect implements an object detector cascade. + +The technique used is a degenerate tree of Haar-like classifiers, commonly +used for face detection. It is described in + + P. Viola, M. Jones. + Rapid Object Detection using a Boosted Cascade of Simple Features, 2001 + IEEE Conference on Computer Vision and Pattern Recognition + +A Cascade can be constructed manually from a set of Classifiers in stages, +or can be loaded from an XML file in the OpenCV format with + + classifier, _, err := detect.ParseOpenCV(r) + +The classifier can be used to determine if a full image is detected as an +object using Detect + + if classifier.Match(m) { + // m is an image of a face. + } + +It is also possible to search an image for occurrences of an object + + objs := classifier.Find(m) +*/ +package detect diff --git a/Godeps/_workspace/src/code.google.com/p/graphics-go/graphics/detect/integral.go b/Godeps/_workspace/src/code.google.com/p/graphics-go/graphics/detect/integral.go new file mode 100644 index 000000000..814ced590 --- /dev/null +++ b/Godeps/_workspace/src/code.google.com/p/graphics-go/graphics/detect/integral.go @@ -0,0 +1,93 @@ +// Copyright 2011 The Graphics-Go Authors. All rights reserved. +// Use of this source code is governed by a BSD-style +// license that can be found in the LICENSE file. + +package detect + +import ( + "image" + "image/draw" +) + +// integral is an image.Image-like structure that stores the cumulative +// sum of the preceding pixels. This allows for O(1) summation of any +// rectangular region within the image. +type integral struct { + // pix holds the cumulative sum of the image's pixels. The pixel at + // (x, y) starts at pix[(y-rect.Min.Y)*stride + (x-rect.Min.X)*1]. + pix []uint64 + stride int + rect image.Rectangle +} + +func (p *integral) at(x, y int) uint64 { + return p.pix[(y-p.rect.Min.Y)*p.stride+(x-p.rect.Min.X)] +} + +func (p *integral) sum(b image.Rectangle) uint64 { + c := p.at(b.Max.X-1, b.Max.Y-1) + inY := b.Min.Y > p.rect.Min.Y + inX := b.Min.X > p.rect.Min.X + if inY && inX { + c += p.at(b.Min.X-1, b.Min.Y-1) + } + if inY { + c -= p.at(b.Max.X-1, b.Min.Y-1) + } + if inX { + c -= p.at(b.Min.X-1, b.Max.Y-1) + } + return c +} + +func (m *integral) integrate() { + b := m.rect + for y := b.Min.Y; y < b.Max.Y; y++ { + for x := b.Min.X; x < b.Max.X; x++ { + c := uint64(0) + if y > b.Min.Y && x > b.Min.X { + c += m.at(x-1, y) + c += m.at(x, y-1) + c -= m.at(x-1, y-1) + } else if y > b.Min.Y { + c += m.at(b.Min.X, y-1) + } else if x > b.Min.X { + c += m.at(x-1, b.Min.Y) + } + m.pix[(y-m.rect.Min.Y)*m.stride+(x-m.rect.Min.X)] += c + } + } +} + +// newIntegrals returns the integral and the squared integral. +func newIntegrals(src image.Image) (*integral, *integral) { + b := src.Bounds() + srcg, ok := src.(*image.Gray) + if !ok { + srcg = image.NewGray(b) + draw.Draw(srcg, b, src, b.Min, draw.Src) + } + + m := integral{ + pix: make([]uint64, b.Max.Y*b.Max.X), + stride: b.Max.X, + rect: b, + } + mSq := integral{ + pix: make([]uint64, b.Max.Y*b.Max.X), + stride: b.Max.X, + rect: b, + } + for y := b.Min.Y; y < b.Max.Y; y++ { + for x := b.Min.X; x < b.Max.X; x++ { + os := (y-b.Min.Y)*srcg.Stride + x - b.Min.X + om := (y-b.Min.Y)*m.stride + x - b.Min.X + c := uint64(srcg.Pix[os]) + m.pix[om] = c + mSq.pix[om] = c * c + } + } + m.integrate() + mSq.integrate() + return &m, &mSq +} diff --git a/Godeps/_workspace/src/code.google.com/p/graphics-go/graphics/detect/integral_test.go b/Godeps/_workspace/src/code.google.com/p/graphics-go/graphics/detect/integral_test.go new file mode 100644 index 000000000..0bc321a4d --- /dev/null +++ b/Godeps/_workspace/src/code.google.com/p/graphics-go/graphics/detect/integral_test.go @@ -0,0 +1,156 @@ +// Copyright 2011 The Graphics-Go Authors. All rights reserved. +// Use of this source code is governed by a BSD-style +// license that can be found in the LICENSE file. + +package detect + +import ( + "bytes" + "fmt" + "image" + "testing" +) + +type integralTest struct { + x int + y int + src []uint8 + res []uint8 +} + +var integralTests = []integralTest{ + { + 1, 1, + []uint8{0x01}, + []uint8{0x01}, + }, + { + 2, 2, + []uint8{ + 0x01, 0x02, + 0x03, 0x04, + }, + []uint8{ + 0x01, 0x03, + 0x04, 0x0a, + }, + }, + { + 4, 4, + []uint8{ + 0x02, 0x03, 0x00, 0x01, + 0x01, 0x02, 0x01, 0x05, + 0x01, 0x01, 0x01, 0x01, + 0x01, 0x01, 0x01, 0x01, + }, + []uint8{ + 0x02, 0x05, 0x05, 0x06, + 0x03, 0x08, 0x09, 0x0f, + 0x04, 0x0a, 0x0c, 0x13, + 0x05, 0x0c, 0x0f, 0x17, + }, + }, +} + +func sprintBox(box []byte, width, height int) string { + buf := bytes.NewBuffer(nil) + i := 0 + for y := 0; y < height; y++ { + for x := 0; x < width; x++ { + fmt.Fprintf(buf, " 0x%02x,", box[i]) + i++ + } + buf.WriteByte('\n') + } + return buf.String() +} + +func TestIntegral(t *testing.T) { + for i, oc := range integralTests { + src := &image.Gray{ + Pix: oc.src, + Stride: oc.x, + Rect: image.Rect(0, 0, oc.x, oc.y), + } + dst, _ := newIntegrals(src) + res := make([]byte, len(dst.pix)) + for i, p := range dst.pix { + res[i] = byte(p) + } + + if !bytes.Equal(res, oc.res) { + got := sprintBox(res, oc.x, oc.y) + want := sprintBox(oc.res, oc.x, oc.y) + t.Errorf("%d: got\n%s\n want\n%s", i, got, want) + } + } +} + +func TestIntegralSum(t *testing.T) { + src := &image.Gray{ + Pix: []uint8{ + 0x02, 0x03, 0x00, 0x01, 0x03, + 0x01, 0x02, 0x01, 0x05, 0x05, + 0x01, 0x01, 0x01, 0x01, 0x02, + 0x01, 0x01, 0x01, 0x01, 0x07, + 0x02, 0x01, 0x00, 0x03, 0x01, + }, + Stride: 5, + Rect: image.Rect(0, 0, 5, 5), + } + img, _ := newIntegrals(src) + + type sumTest struct { + rect image.Rectangle + sum uint64 + } + + var sumTests = []sumTest{ + {image.Rect(0, 0, 1, 1), 2}, + {image.Rect(0, 0, 2, 1), 5}, + {image.Rect(0, 0, 1, 3), 4}, + {image.Rect(1, 1, 3, 3), 5}, + {image.Rect(2, 2, 4, 4), 4}, + {image.Rect(4, 3, 5, 5), 8}, + {image.Rect(2, 4, 3, 5), 0}, + } + + for _, st := range sumTests { + s := img.sum(st.rect) + if s != st.sum { + t.Errorf("%v: got %d want %d", st.rect, s, st.sum) + return + } + } +} + +func TestIntegralSubImage(t *testing.T) { + m0 := &image.Gray{ + Pix: []uint8{ + 0x02, 0x03, 0x00, 0x01, 0x03, + 0x01, 0x02, 0x01, 0x05, 0x05, + 0x01, 0x04, 0x01, 0x01, 0x02, + 0x01, 0x02, 0x01, 0x01, 0x07, + 0x02, 0x01, 0x09, 0x03, 0x01, + }, + Stride: 5, + Rect: image.Rect(0, 0, 5, 5), + } + b := image.Rect(1, 1, 4, 4) + m1 := m0.SubImage(b) + mi0, _ := newIntegrals(m0) + mi1, _ := newIntegrals(m1) + + sum0 := mi0.sum(b) + sum1 := mi1.sum(b) + if sum0 != sum1 { + t.Errorf("b got %d want %d", sum0, sum1) + } + + r0 := image.Rect(2, 2, 4, 4) + sum0 = mi0.sum(r0) + sum1 = mi1.sum(r0) + if sum0 != sum1 { + t.Errorf("r0 got %d want %d", sum1, sum0) + } +} diff --git a/Godeps/_workspace/src/code.google.com/p/graphics-go/graphics/detect/opencv_parser.go b/Godeps/_workspace/src/code.google.com/p/graphics-go/graphics/detect/opencv_parser.go new file mode 100644 index 000000000..51ded1a1c --- /dev/null +++ b/Godeps/_workspace/src/code.google.com/p/graphics-go/graphics/detect/opencv_parser.go @@ -0,0 +1,125 @@ +// Copyright 2011 The Graphics-Go Authors. All rights reserved. +// Use of this source code is governed by a BSD-style +// license that can be found in the LICENSE file. + +package detect + +import ( + "bytes" + "encoding/xml" + "errors" + "fmt" + "image" + "io" + "io/ioutil" + "strconv" + "strings" +) + +type xmlFeature struct { + Rects []string `xml:"grp>feature>rects>grp"` + Tilted int `xml:"grp>feature>tilted"` + Threshold float64 `xml:"grp>threshold"` + Left float64 `xml:"grp>left_val"` + Right float64 `xml:"grp>right_val"` +} + +type xmlStages struct { + Trees []xmlFeature `xml:"trees>grp"` + Stage_threshold float64 `xml:"stage_threshold"` + Parent int `xml:"parent"` + Next int `xml:"next"` +} + +type opencv_storage struct { + Any struct { + XMLName xml.Name + Type string `xml:"type_id,attr"` + Size string `xml:"size"` + Stages []xmlStages `xml:"stages>grp"` + } `xml:",any"` +} + +func buildFeature(r string) (f Feature, err error) { + var x, y, w, h int + var weight float64 + _, err = fmt.Sscanf(r, "%d %d %d %d %f", &x, &y, &w, &h, &weight) + if err != nil { + return + } + f.Rect = image.Rect(x, y, x+w, y+h) + f.Weight = weight + return +} + +func buildCascade(s *opencv_storage) (c *Cascade, name string, err error) { + if s.Any.Type != "opencv-haar-classifier" { + err = fmt.Errorf("got %s want opencv-haar-classifier", s.Any.Type) + return + } + name = s.Any.XMLName.Local + + c = &Cascade{} + sizes := strings.Split(s.Any.Size, " ") + w, err := strconv.Atoi(sizes[0]) + if err != nil { + return nil, "", err + } + h, err := strconv.Atoi(sizes[1]) + if err != nil { + return nil, "", err + } + c.Size = image.Pt(w, h) + c.Stage = []CascadeStage{} + + for _, stage := range s.Any.Stages { + cs := CascadeStage{ + Classifier: []Classifier{}, + Threshold: stage.Stage_threshold, + } + for _, tree := range stage.Trees { + if tree.Tilted != 0 { + err = errors.New("Cascade does not support tilted features") + return + } + + cls := Classifier{ + Feature: []Feature{}, + Threshold: tree.Threshold, + Left: tree.Left, + Right: tree.Right, + } + + for _, rect := range tree.Rects { + f, err := buildFeature(rect) + if err != nil { + return nil, "", err + } + cls.Feature = append(cls.Feature, f) + } + + cs.Classifier = append(cs.Classifier, cls) + } + c.Stage = append(c.Stage, cs) + } + + return +} + +// ParseOpenCV produces a detection Cascade from an OpenCV XML file. +func ParseOpenCV(r io.Reader) (cascade *Cascade, name string, err error) { + // BUG(crawshaw): tag-based parsing doesn't seem to work with <_> + buf, err := ioutil.ReadAll(r) + if err != nil { + return + } + buf = bytes.Replace(buf, []byte("<_>"), []byte("<grp>"), -1) + buf = bytes.Replace(buf, []byte("</_>"), []byte("</grp>"), -1) + + s := &opencv_storage{} + err = xml.Unmarshal(buf, s) + if err != nil { + return + } + return buildCascade(s) +} diff --git a/Godeps/_workspace/src/code.google.com/p/graphics-go/graphics/detect/opencv_parser_test.go b/Godeps/_workspace/src/code.google.com/p/graphics-go/graphics/detect/opencv_parser_test.go new file mode 100644 index 000000000..343390499 --- /dev/null +++ b/Godeps/_workspace/src/code.google.com/p/graphics-go/graphics/detect/opencv_parser_test.go @@ -0,0 +1,75 @@ +// Copyright 2011 The Graphics-Go Authors. All rights reserved. +// Use of this source code is governed by a BSD-style +// license that can be found in the LICENSE file. + +package detect + +import ( + "image" + "os" + "reflect" + "testing" +) + +var ( + classifier0 = Classifier{ + Feature: []Feature{ + Feature{Rect: image.Rect(0, 0, 3, 4), Weight: -1}, + Feature{Rect: image.Rect(3, 4, 5, 6), Weight: 3.1}, + }, + Threshold: 0.03, + Left: 0.01, + Right: 0.8, + } + classifier1 = Classifier{ + Feature: []Feature{ + Feature{Rect: image.Rect(3, 7, 17, 11), Weight: -3.2}, + Feature{Rect: image.Rect(3, 9, 17, 11), Weight: 2.}, + }, + Threshold: 0.11, + Left: 0.03, + Right: 0.83, + } + classifier2 = Classifier{ + Feature: []Feature{ + Feature{Rect: image.Rect(1, 1, 3, 3), Weight: -1.}, + Feature{Rect: image.Rect(3, 3, 5, 5), Weight: 2.5}, + }, + Threshold: 0.07, + Left: 0.2, + Right: 0.4, + } + cascade = Cascade{ + Stage: []CascadeStage{ + CascadeStage{ + Classifier: []Classifier{classifier0, classifier1}, + Threshold: 0.82, + }, + CascadeStage{ + Classifier: []Classifier{classifier2}, + Threshold: 0.22, + }, + }, + Size: image.Pt(20, 20), + } +) + +func TestParseOpenCV(t *testing.T) { + file, err := os.Open("../../testdata/opencv.xml") + if err != nil { + t.Fatal(err) + } + defer file.Close() + + cascadeFile, name, err := ParseOpenCV(file) + if err != nil { + t.Fatal(err) + } + if name != "name_of_cascade" { + t.Fatalf("name: got %s want name_of_cascade", name) + } + + if !reflect.DeepEqual(cascade, *cascadeFile) { + t.Errorf("got\n %v want\n %v", *cascadeFile, cascade) + } +} diff --git a/Godeps/_workspace/src/code.google.com/p/graphics-go/graphics/detect/projector.go b/Godeps/_workspace/src/code.google.com/p/graphics-go/graphics/detect/projector.go new file mode 100644 index 000000000..1ebd6db59 --- /dev/null +++ b/Godeps/_workspace/src/code.google.com/p/graphics-go/graphics/detect/projector.go @@ -0,0 +1,55 @@ +// Copyright 2011 The Graphics-Go Authors. All rights reserved. +// Use of this source code is governed by a BSD-style +// license that can be found in the LICENSE file. + +package detect + +import ( + "image" +) + +// projector allows projecting from a source Rectangle onto a target Rectangle. +type projector struct { + // rx, ry is the scaling factor. + rx, ry float64 + // dx, dy is the translation factor. + dx, dy float64 + // r is the clipping region of the target. + r image.Rectangle +} + +// newProjector creates a Projector with source src and target dst. +func newProjector(dst image.Rectangle, src image.Rectangle) *projector { + return &projector{ + rx: float64(dst.Dx()) / float64(src.Dx()), + ry: float64(dst.Dy()) / float64(src.Dy()), + dx: float64(dst.Min.X - src.Min.X), + dy: float64(dst.Min.Y - src.Min.Y), + r: dst, + } +} + +// pt projects p from the source rectangle onto the target rectangle. +func (s *projector) pt(p image.Point) image.Point { + return image.Point{ + clamp(s.rx*float64(p.X)+s.dx, s.r.Min.X, s.r.Max.X), + clamp(s.ry*float64(p.Y)+s.dy, s.r.Min.Y, s.r.Max.Y), + } +} + +// rect projects r from the source rectangle onto the target rectangle. +func (s *projector) rect(r image.Rectangle) image.Rectangle { + return image.Rectangle{s.pt(r.Min), s.pt(r.Max)} +} + +// clamp rounds and clamps o to the integer range [x0, x1]. +func clamp(o float64, x0, x1 int) int { + x := int(o + 0.5) + if x < x0 { + return x0 + } + if x > x1 { + return x1 + } + return x +} diff --git a/Godeps/_workspace/src/code.google.com/p/graphics-go/graphics/detect/projector_test.go b/Godeps/_workspace/src/code.google.com/p/graphics-go/graphics/detect/projector_test.go new file mode 100644 index 000000000..c6d0b0cd5 --- /dev/null +++ b/Godeps/_workspace/src/code.google.com/p/graphics-go/graphics/detect/projector_test.go @@ -0,0 +1,49 @@ +// Copyright 2011 The Graphics-Go Authors. All rights reserved. +// Use of this source code is governed by a BSD-style +// license that can be found in the LICENSE file. + +package detect + +import ( + "image" + "reflect" + "testing" +) + +type projectorTest struct { + dst image.Rectangle + src image.Rectangle + pdst image.Rectangle + psrc image.Rectangle +} + +var projectorTests = []projectorTest{ + { + image.Rect(0, 0, 6, 6), + image.Rect(0, 0, 2, 2), + image.Rect(0, 0, 6, 6), + image.Rect(0, 0, 2, 2), + }, + { + image.Rect(0, 0, 6, 6), + image.Rect(0, 0, 2, 2), + image.Rect(3, 3, 6, 6), + image.Rect(1, 1, 2, 2), + }, + { + image.Rect(30, 30, 40, 40), + image.Rect(10, 10, 20, 20), + image.Rect(32, 33, 34, 37), + image.Rect(12, 13, 14, 17), + }, +} + +func TestProjector(t *testing.T) { + for i, tt := range projectorTests { + pr := newProjector(tt.dst, tt.src) + res := pr.rect(tt.psrc) + if !reflect.DeepEqual(res, tt.pdst) { + t.Errorf("%d: got %v want %v", i, res, tt.pdst) + } + } +} diff --git a/Godeps/_workspace/src/code.google.com/p/graphics-go/graphics/graphicstest/Makefile b/Godeps/_workspace/src/code.google.com/p/graphics-go/graphics/graphicstest/Makefile new file mode 100644 index 000000000..7bfdf22d8 --- /dev/null +++ b/Godeps/_workspace/src/code.google.com/p/graphics-go/graphics/graphicstest/Makefile @@ -0,0 +1,11 @@ +# Copyright 2011 The Graphics-Go Authors. All rights reserved. +# Use of this source code is governed by a BSD-style +# license that can be found in the LICENSE file. + +include $(GOROOT)/src/Make.inc + +TARG=code.google.com/p/graphics-go/graphics/graphicstest +GOFILES=\ + graphicstest.go\ + +include $(GOROOT)/src/Make.pkg diff --git a/Godeps/_workspace/src/code.google.com/p/graphics-go/graphics/graphicstest/graphicstest.go b/Godeps/_workspace/src/code.google.com/p/graphics-go/graphics/graphicstest/graphicstest.go new file mode 100644 index 000000000..ceb3a974d --- /dev/null +++ b/Godeps/_workspace/src/code.google.com/p/graphics-go/graphics/graphicstest/graphicstest.go @@ -0,0 +1,112 @@ +// Copyright 2011 The Graphics-Go Authors. All rights reserved. +// Use of this source code is governed by a BSD-style +// license that can be found in the LICENSE file. + +package graphicstest + +import ( + "bytes" + "errors" + "fmt" + "image" + "image/color" + "os" +) + +// LoadImage decodes an image from a file. +func LoadImage(path string) (img image.Image, err error) { + file, err := os.Open(path) + if err != nil { + return + } + defer file.Close() + img, _, err = image.Decode(file) + return +} + +func delta(u0, u1 uint32) int { + d := int(u0) - int(u1) + if d < 0 { + return -d + } + return d +} + +func withinTolerance(c0, c1 color.Color, tol int) bool { + r0, g0, b0, a0 := c0.RGBA() + r1, g1, b1, a1 := c1.RGBA() + r := delta(r0, r1) + g := delta(g0, g1) + b := delta(b0, b1) + a := delta(a0, a1) + return r <= tol && g <= tol && b <= tol && a <= tol +} + +// ImageWithinTolerance checks that each pixel varies by no more than tol. +func ImageWithinTolerance(m0, m1 image.Image, tol int) error { + b0 := m0.Bounds() + b1 := m1.Bounds() + if !b0.Eq(b1) { + return errors.New(fmt.Sprintf("got bounds %v want %v", b0, b1)) + } + + for y := b0.Min.Y; y < b0.Max.Y; y++ { + for x := b0.Min.X; x < b0.Max.X; x++ { + c0 := m0.At(x, y) + c1 := m1.At(x, y) + if !withinTolerance(c0, c1, tol) { + e := fmt.Sprintf("got %v want %v at (%d, %d)", c0, c1, x, y) + return errors.New(e) + } + } + } + return nil +} + +// SprintBox pretty prints the array as a hexidecimal matrix. +func SprintBox(box []byte, width, height int) string { + buf := bytes.NewBuffer(nil) + i := 0 + for y := 0; y < height; y++ { + for x := 0; x < width; x++ { + fmt.Fprintf(buf, " 0x%02x,", box[i]) + i++ + } + buf.WriteByte('\n') + } + return buf.String() +} + +// SprintImageR pretty prints the red channel of src. It looks like SprintBox. +func SprintImageR(src *image.RGBA) string { + w, h := src.Rect.Dx(), src.Rect.Dy() + i := 0 + box := make([]byte, w*h) + for y := src.Rect.Min.Y; y < src.Rect.Max.Y; y++ { + for x := src.Rect.Min.X; x < src.Rect.Max.X; x++ { + off := (y-src.Rect.Min.Y)*src.Stride + (x-src.Rect.Min.X)*4 + box[i] = src.Pix[off] + i++ + } + } + return SprintBox(box, w, h) +} + +// MakeRGBA returns an image with R, G, B taken from src. +func MakeRGBA(src []uint8, width int) *image.RGBA { + b := image.Rect(0, 0, width, len(src)/width) + ret := image.NewRGBA(b) + i := 0 + for y := b.Min.Y; y < b.Max.Y; y++ { + for x := b.Min.X; x < b.Max.X; x++ { + ret.SetRGBA(x, y, color.RGBA{ + R: src[i], + G: src[i], + B: src[i], + A: 0xff, + }) + i++ + } + } + return ret +} diff --git a/Godeps/_workspace/src/code.google.com/p/graphics-go/graphics/interp/Makefile b/Godeps/_workspace/src/code.google.com/p/graphics-go/graphics/interp/Makefile new file mode 100644 index 000000000..4d8f524fb --- /dev/null +++ b/Godeps/_workspace/src/code.google.com/p/graphics-go/graphics/interp/Makefile @@ -0,0 +1,13 @@ +# Copyright 2012 The Graphics-Go Authors. All rights reserved. +# Use of this source code is governed by a BSD-style +# license that can be found in the LICENSE file. + +include $(GOROOT)/src/Make.inc + +TARG=code.google.com/p/graphics-go/graphics/interp +GOFILES=\ + bilinear.go\ + doc.go\ + interp.go\ + +include $(GOROOT)/src/Make.pkg diff --git a/Godeps/_workspace/src/code.google.com/p/graphics-go/graphics/interp/bilinear.go b/Godeps/_workspace/src/code.google.com/p/graphics-go/graphics/interp/bilinear.go new file mode 100644 index 000000000..e18321a15 --- /dev/null +++ b/Godeps/_workspace/src/code.google.com/p/graphics-go/graphics/interp/bilinear.go @@ -0,0 +1,206 @@ +// Copyright 2012 The Graphics-Go Authors. All rights reserved. +// Use of this source code is governed by a BSD-style +// license that can be found in the LICENSE file. + +package interp + +import ( + "image" + "image/color" + "math" +) + +// Bilinear implements bilinear interpolation. +var Bilinear Interp = bilinear{} + +type bilinear struct{} + +func (i bilinear) Interp(src image.Image, x, y float64) color.Color { + if src, ok := src.(*image.RGBA); ok { + return i.RGBA(src, x, y) + } + return bilinearGeneral(src, x, y) +} + +func bilinearGeneral(src image.Image, x, y float64) color.Color { + p := findLinearSrc(src.Bounds(), x, y) + var fr, fg, fb, fa float64 + var r, g, b, a uint32 + + r, g, b, a = src.At(p.low.X, p.low.Y).RGBA() + fr += float64(r) * p.frac00 + fg += float64(g) * p.frac00 + fb += float64(b) * p.frac00 + fa += float64(a) * p.frac00 + + r, g, b, a = src.At(p.high.X, p.low.Y).RGBA() + fr += float64(r) * p.frac01 + fg += float64(g) * p.frac01 + fb += float64(b) * p.frac01 + fa += float64(a) * p.frac01 + + r, g, b, a = src.At(p.low.X, p.high.Y).RGBA() + fr += float64(r) * p.frac10 + fg += float64(g) * p.frac10 + fb += float64(b) * p.frac10 + fa += float64(a) * p.frac10 + + r, g, b, a = src.At(p.high.X, p.high.Y).RGBA() + fr += float64(r) * p.frac11 + fg += float64(g) * p.frac11 + fb += float64(b) * p.frac11 + fa += float64(a) * p.frac11 + + var c color.RGBA64 + c.R = uint16(fr + 0.5) + c.G = uint16(fg + 0.5) + c.B = uint16(fb + 0.5) + c.A = uint16(fa + 0.5) + return c +} + +func (bilinear) RGBA(src *image.RGBA, x, y float64) color.RGBA { + p := findLinearSrc(src.Bounds(), x, y) + + // Array offsets for the surrounding pixels. + off00 := offRGBA(src, p.low.X, p.low.Y) + off01 := offRGBA(src, p.high.X, p.low.Y) + off10 := offRGBA(src, p.low.X, p.high.Y) + off11 := offRGBA(src, p.high.X, p.high.Y) + + var fr, fg, fb, fa float64 + + fr += float64(src.Pix[off00+0]) * p.frac00 + fg += float64(src.Pix[off00+1]) * p.frac00 + fb += float64(src.Pix[off00+2]) * p.frac00 + fa += float64(src.Pix[off00+3]) * p.frac00 + + fr += float64(src.Pix[off01+0]) * p.frac01 + fg += float64(src.Pix[off01+1]) * p.frac01 + fb += float64(src.Pix[off01+2]) * p.frac01 + fa += float64(src.Pix[off01+3]) * p.frac01 + + fr += float64(src.Pix[off10+0]) * p.frac10 + fg += float64(src.Pix[off10+1]) * p.frac10 + fb += float64(src.Pix[off10+2]) * p.frac10 + fa += float64(src.Pix[off10+3]) * p.frac10 + + fr += float64(src.Pix[off11+0]) * p.frac11 + fg += float64(src.Pix[off11+1]) * p.frac11 + fb += float64(src.Pix[off11+2]) * p.frac11 + fa += float64(src.Pix[off11+3]) * p.frac11 + + var c color.RGBA + c.R = uint8(fr + 0.5) + c.G = uint8(fg + 0.5) + c.B = uint8(fb + 0.5) + c.A = uint8(fa + 0.5) + return c +} + +func (bilinear) Gray(src *image.Gray, x, y float64) color.Gray { + p := findLinearSrc(src.Bounds(), x, y) + + // Array offsets for the surrounding pixels. + off00 := offGray(src, p.low.X, p.low.Y) + off01 := offGray(src, p.high.X, p.low.Y) + off10 := offGray(src, p.low.X, p.high.Y) + off11 := offGray(src, p.high.X, p.high.Y) + + var fc float64 + fc += float64(src.Pix[off00]) * p.frac00 + fc += float64(src.Pix[off01]) * p.frac01 + fc += float64(src.Pix[off10]) * p.frac10 + fc += float64(src.Pix[off11]) * p.frac11 + + var c color.Gray + c.Y = uint8(fc + 0.5) + return c +} + +type bilinearSrc struct { + // Top-left and bottom-right interpolation sources + low, high image.Point + // Fraction of each pixel to take. The 0 suffix indicates + // top/left, and the 1 suffix indicates bottom/right. + frac00, frac01, frac10, frac11 float64 +} + +func findLinearSrc(b image.Rectangle, sx, sy float64) bilinearSrc { + maxX := float64(b.Max.X) + maxY := float64(b.Max.Y) + minX := float64(b.Min.X) + minY := float64(b.Min.Y) + lowX := math.Floor(sx - 0.5) + lowY := math.Floor(sy - 0.5) + if lowX < minX { + lowX = minX + } + if lowY < minY { + lowY = minY + } + + highX := math.Ceil(sx - 0.5) + highY := math.Ceil(sy - 0.5) + if highX >= maxX { + highX = maxX - 1 + } + if highY >= maxY { + highY = maxY - 1 + } + + // In the variables below, the 0 suffix indicates top/left, and the + // 1 suffix indicates bottom/right. + + // Center of each surrounding pixel. + x00 := lowX + 0.5 + y00 := lowY + 0.5 + x01 := highX + 0.5 + y01 := lowY + 0.5 + x10 := lowX + 0.5 + y10 := highY + 0.5 + x11 := highX + 0.5 + y11 := highY + 0.5 + + p := bilinearSrc{ + low: image.Pt(int(lowX), int(lowY)), + high: image.Pt(int(highX), int(highY)), + } + + // Literally, edge cases. If we are close enough to the edge of + // the image, curtail the interpolation sources. + if lowX == highX && lowY == highY { + p.frac00 = 1.0 + } else if sy-minY <= 0.5 && sx-minX <= 0.5 { + p.frac00 = 1.0 + } else if maxY-sy <= 0.5 && maxX-sx <= 0.5 { + p.frac11 = 1.0 + } else if sy-minY <= 0.5 || lowY == highY { + p.frac00 = x01 - sx + p.frac01 = sx - x00 + } else if sx-minX <= 0.5 || lowX == highX { + p.frac00 = y10 - sy + p.frac10 = sy - y00 + } else if maxY-sy <= 0.5 { + p.frac10 = x11 - sx + p.frac11 = sx - x10 + } else if maxX-sx <= 0.5 { + p.frac01 = y11 - sy + p.frac11 = sy - y01 + } else { + p.frac00 = (x01 - sx) * (y10 - sy) + p.frac01 = (sx - x00) * (y11 - sy) + p.frac10 = (x11 - sx) * (sy - y00) + p.frac11 = (sx - x10) * (sy - y01) + } + + return p +} + +// TODO(crawshaw): When we have inlining, consider func (p *RGBA) Off(x, y) int +func offRGBA(src *image.RGBA, x, y int) int { + return (y-src.Rect.Min.Y)*src.Stride + (x-src.Rect.Min.X)*4 +} +func offGray(src *image.Gray, x, y int) int { + return (y-src.Rect.Min.Y)*src.Stride + (x - src.Rect.Min.X) +} diff --git a/Godeps/_workspace/src/code.google.com/p/graphics-go/graphics/interp/bilinear_test.go b/Godeps/_workspace/src/code.google.com/p/graphics-go/graphics/interp/bilinear_test.go new file mode 100644 index 000000000..242d70546 --- /dev/null +++ b/Godeps/_workspace/src/code.google.com/p/graphics-go/graphics/interp/bilinear_test.go @@ -0,0 +1,143 @@ +// Copyright 2012 The Graphics-Go Authors. All rights reserved. +// Use of this source code is governed by a BSD-style +// license that can be found in the LICENSE file. + +package interp + +import ( + "image" + "image/color" + "testing" +) + +type interpTest struct { + desc string + src []uint8 + srcWidth int + x, y float64 + expect uint8 +} + +func (p *interpTest) newSrc() *image.RGBA { + b := image.Rect(0, 0, p.srcWidth, len(p.src)/p.srcWidth) + src := image.NewRGBA(b) + i := 0 + for y := b.Min.Y; y < b.Max.Y; y++ { + for x := b.Min.X; x < b.Max.X; x++ { + src.SetRGBA(x, y, color.RGBA{ + R: p.src[i], + G: p.src[i], + B: p.src[i], + A: 0xff, + }) + i++ + } + } + return src +} + +var interpTests = []interpTest{ + { + desc: "center of a single white pixel should match that pixel", + src: []uint8{0x00}, + srcWidth: 1, + x: 0.5, + y: 0.5, + expect: 0x00, + }, + { + desc: "middle of a square is equally weighted", + src: []uint8{ + 0x00, 0xff, + 0xff, 0x00, + }, + srcWidth: 2, + x: 1.0, + y: 1.0, + expect: 0x80, + }, + { + desc: "center of a pixel is just that pixel", + src: []uint8{ + 0x00, 0xff, + 0xff, 0x00, + }, + srcWidth: 2, + x: 1.5, + y: 0.5, + expect: 0xff, + }, + { + desc: "asymmetry abounds", + src: []uint8{ + 0xaa, 0x11, 0x55, + 0xff, 0x95, 0xdd, + }, + srcWidth: 3, + x: 2.0, + y: 1.0, + expect: 0x76, // (0x11 + 0x55 + 0x95 + 0xdd) / 4 + }, +} + +func TestBilinearRGBA(t *testing.T) { + for _, p := range interpTests { + src := p.newSrc() + + // Fast path. + c := Bilinear.(RGBA).RGBA(src, p.x, p.y) + if c.R != c.G || c.R != c.B || c.A != 0xff { + t.Errorf("expect channels to match, got %v", c) + continue + } + if c.R != p.expect { + t.Errorf("%s: got 0x%02x want 0x%02x", p.desc, c.R, p.expect) + continue + } + + // Standard Interp should use the fast path. + cStd := Bilinear.Interp(src, p.x, p.y) + if cStd != c { + t.Errorf("%s: standard mismatch got %v want %v", p.desc, cStd, c) + continue + } + + // General case should match the fast path. + cGen := color.RGBAModel.Convert(bilinearGeneral(src, p.x, p.y)) + r0, g0, b0, a0 := c.RGBA() + r1, g1, b1, a1 := cGen.RGBA() + if r0 != r1 || g0 != g1 || b0 != b1 || a0 != a1 { + t.Errorf("%s: general case mismatch got %v want %v", p.desc, c, cGen) + continue + } + } +} + +func TestBilinearSubImage(t *testing.T) { + b0 := image.Rect(0, 0, 4, 4) + src0 := image.NewRGBA(b0) + b1 := image.Rect(1, 1, 3, 3) + src1 := src0.SubImage(b1).(*image.RGBA) + src1.Set(1, 1, color.RGBA{0x11, 0, 0, 0xff}) + src1.Set(2, 1, color.RGBA{0x22, 0, 0, 0xff}) + src1.Set(1, 2, color.RGBA{0x33, 0, 0, 0xff}) + src1.Set(2, 2, color.RGBA{0x44, 0, 0, 0xff}) + + tests := []struct { + x, y float64 + want uint8 + }{ + {1, 1, 0x11}, + {3, 1, 0x22}, + {1, 3, 0x33}, + {3, 3, 0x44}, + {2, 2, 0x2b}, + } + + for _, p := range tests { + c := Bilinear.(RGBA).RGBA(src1, p.x, p.y) + if c.R != p.want { + t.Errorf("(%.0f, %.0f): got 0x%02x want 0x%02x", p.x, p.y, c.R, p.want) + } + } +} diff --git a/Godeps/_workspace/src/code.google.com/p/graphics-go/graphics/interp/doc.go b/Godeps/_workspace/src/code.google.com/p/graphics-go/graphics/interp/doc.go new file mode 100644 index 000000000..b115534cc --- /dev/null +++ b/Godeps/_workspace/src/code.google.com/p/graphics-go/graphics/interp/doc.go @@ -0,0 +1,25 @@ +// Copyright 2012 The Graphics-Go Authors. All rights reserved. +// Use of this source code is governed by a BSD-style +// license that can be found in the LICENSE file. + +/* +Package interp implements image interpolation. + +An interpolator provides the Interp interface, which can be used +to interpolate a pixel: + + c := interp.Bilinear.Interp(src, 1.2, 1.8) + +To interpolate a large number of RGBA or Gray pixels, an implementation +may provide a fast-path by implementing the RGBA or Gray interfaces. + + i1, ok := i.(interp.RGBA) + if ok { + c := i1.RGBA(src, 1.2, 1.8) + // use c.R, c.G, etc + return + } + c := i.Interp(src, 1.2, 1.8) + // use generic color.Color +*/ +package interp diff --git a/Godeps/_workspace/src/code.google.com/p/graphics-go/graphics/interp/interp.go b/Godeps/_workspace/src/code.google.com/p/graphics-go/graphics/interp/interp.go new file mode 100644 index 000000000..560637d4a --- /dev/null +++ b/Godeps/_workspace/src/code.google.com/p/graphics-go/graphics/interp/interp.go @@ -0,0 +1,29 @@ +// Copyright 2012 The Graphics-Go Authors. All rights reserved. +// Use of this source code is governed by a BSD-style +// license that can be found in the LICENSE file. + +package interp + +import ( + "image" + "image/color" +) + +// Interp interpolates an image's color at fractional co-ordinates. +type Interp interface { + // Interp interpolates (x, y). + Interp(src image.Image, x, y float64) color.Color +} + +// RGBA is a fast-path interpolation implementation for image.RGBA. +// It is common for an Interp to also implement RGBA. +type RGBA interface { + // RGBA interpolates (x, y). + RGBA(src *image.RGBA, x, y float64) color.RGBA +} + +// Gray is a fast-path interpolation implementation for image.Gray. +type Gray interface { + // Gray interpolates (x, y). + Gray(src *image.Gray, x, y float64) color.Gray +} diff --git a/Godeps/_workspace/src/code.google.com/p/graphics-go/graphics/rotate.go b/Godeps/_workspace/src/code.google.com/p/graphics-go/graphics/rotate.go new file mode 100644 index 000000000..62bde1a08 --- /dev/null +++ b/Godeps/_workspace/src/code.google.com/p/graphics-go/graphics/rotate.go @@ -0,0 +1,35 @@ +// Copyright 2011 The Graphics-Go Authors. All rights reserved. +// Use of this source code is governed by a BSD-style +// license that can be found in the LICENSE file. + +package graphics + +import ( + "code.google.com/p/graphics-go/graphics/interp" + "errors" + "image" + "image/draw" +) + +// RotateOptions are the rotation parameters. +// Angle is the angle, in radians, to rotate the image clockwise. +type RotateOptions struct { + Angle float64 +} + +// Rotate produces a rotated version of src, drawn onto dst. +func Rotate(dst draw.Image, src image.Image, opt *RotateOptions) error { + if dst == nil { + return errors.New("graphics: dst is nil") + } + if src == nil { + return errors.New("graphics: src is nil") + } + + angle := 0.0 + if opt != nil { + angle = opt.Angle + } + + return I.Rotate(angle).TransformCenter(dst, src, interp.Bilinear) +} diff --git a/Godeps/_workspace/src/code.google.com/p/graphics-go/graphics/rotate_test.go b/Godeps/_workspace/src/code.google.com/p/graphics-go/graphics/rotate_test.go new file mode 100644 index 000000000..bfc532a0a --- /dev/null +++ b/Godeps/_workspace/src/code.google.com/p/graphics-go/graphics/rotate_test.go @@ -0,0 +1,169 @@ +// Copyright 2011 The Graphics-Go Authors. All rights reserved. +// Use of this source code is governed by a BSD-style +// license that can be found in the LICENSE file. + +package graphics + +import ( + "code.google.com/p/graphics-go/graphics/graphicstest" + "image" + "math" + "testing" + + _ "image/png" +) + +var rotateOneColorTests = []transformOneColorTest{ + { + "onepixel-onequarter", 1, 1, 1, 1, + &RotateOptions{math.Pi / 2}, + []uint8{0xff}, + []uint8{0xff}, + }, + { + "onepixel-partial", 1, 1, 1, 1, + &RotateOptions{math.Pi * 2.0 / 3.0}, + []uint8{0xff}, + []uint8{0xff}, + }, + { + "onepixel-complete", 1, 1, 1, 1, + &RotateOptions{2 * math.Pi}, + []uint8{0xff}, + []uint8{0xff}, + }, + { + "even-onequarter", 2, 2, 2, 2, + &RotateOptions{math.Pi / 2.0}, + []uint8{ + 0xff, 0x00, + 0x00, 0xff, + }, + []uint8{ + 0x00, 0xff, + 0xff, 0x00, + }, + }, + { + "even-complete", 2, 2, 2, 2, + &RotateOptions{2.0 * math.Pi}, + []uint8{ + 0xff, 0x00, + 0x00, 0xff, + }, + []uint8{ + 0xff, 0x00, + 0x00, 0xff, + }, + }, + { + "line-partial", 3, 3, 3, 3, + &RotateOptions{math.Pi * 1.0 / 3.0}, + []uint8{ + 0x00, 0x00, 0x00, + 0xff, 0xff, 0xff, + 0x00, 0x00, 0x00, + }, + []uint8{ + 0xa2, 0x80, 0x00, + 0x22, 0xff, 0x22, + 0x00, 0x80, 0xa2, + }, + }, + { + "line-offset-partial", 3, 3, 3, 3, + &RotateOptions{math.Pi * 3 / 2}, + []uint8{ + 0x00, 0x00, 0x00, + 0x00, 0xff, 0xff, + 0x00, 0x00, 0x00, + }, + []uint8{ + 0x00, 0xff, 0x00, + 0x00, 0xff, 0x00, + 0x00, 0x00, 0x00, + }, + }, + { + "dot-partial", 4, 4, 4, 4, + &RotateOptions{math.Pi}, + []uint8{ + 0x00, 0x00, 0x00, 0x00, + 0x00, 0xff, 0x00, 0x00, + 0x00, 0x00, 0x00, 0x00, + 0x00, 0x00, 0x00, 0x00, + }, + []uint8{ + 0x00, 0x00, 0x00, 0x00, + 0x00, 0x00, 0x00, 0x00, + 0x00, 0x00, 0xff, 0x00, + 0x00, 0x00, 0x00, 0x00, + }, + }, +} + +func TestRotateOneColor(t *testing.T) { + for _, oc := range rotateOneColorTests { + src := oc.newSrc() + dst := oc.newDst() + + if err := Rotate(dst, src, oc.opt.(*RotateOptions)); err != nil { + t.Errorf("rotate %s: %v", oc.desc, err) + continue + } + if !checkTransformTest(t, &oc, dst) { + continue + } + } +} + +func TestRotateEmpty(t *testing.T) { + empty := image.NewRGBA(image.Rect(0, 0, 0, 0)) + if err := Rotate(empty, empty, nil); err != nil { + t.Fatal(err) + } +} + +func TestRotateGopherSide(t *testing.T) { + src, err := graphicstest.LoadImage("../testdata/gopher.png") + if err != nil { + t.Fatal(err) + } + + srcb := src.Bounds() + dst := image.NewRGBA(image.Rect(0, 0, srcb.Dy(), srcb.Dx())) + if err := Rotate(dst, src, &RotateOptions{math.Pi / 2.0}); err != nil { + t.Fatal(err) + } + + cmp, err := graphicstest.LoadImage("../testdata/gopher-rotate-side.png") + if err != nil { + t.Fatal(err) + } + err = graphicstest.ImageWithinTolerance(dst, cmp, 0x101) + if err != nil { + t.Fatal(err) + } +} + +func TestRotateGopherPartial(t *testing.T) { + src, err := graphicstest.LoadImage("../testdata/gopher.png") + if err != nil { + t.Fatal(err) + } + + srcb := src.Bounds() + dst := image.NewRGBA(image.Rect(0, 0, srcb.Dx(), srcb.Dy())) + if err := Rotate(dst, src, &RotateOptions{math.Pi / 3.0}); err != nil { + t.Fatal(err) + } + + cmp, err := graphicstest.LoadImage("../testdata/gopher-rotate-partial.png") + if err != nil { + t.Fatal(err) + } + err = graphicstest.ImageWithinTolerance(dst, cmp, 0x101) + if err != nil { + t.Fatal(err) + } +} diff --git a/Godeps/_workspace/src/code.google.com/p/graphics-go/graphics/scale.go b/Godeps/_workspace/src/code.google.com/p/graphics-go/graphics/scale.go new file mode 100644 index 000000000..7a7fe9696 --- /dev/null +++ b/Godeps/_workspace/src/code.google.com/p/graphics-go/graphics/scale.go @@ -0,0 +1,31 @@ +// Copyright 2011 The Graphics-Go Authors. All rights reserved. +// Use of this source code is governed by a BSD-style +// license that can be found in the LICENSE file. + +package graphics + +import ( + "code.google.com/p/graphics-go/graphics/interp" + "errors" + "image" + "image/draw" +) + +// Scale produces a scaled version of the image using bilinear interpolation. +func Scale(dst draw.Image, src image.Image) error { + if dst == nil { + return errors.New("graphics: dst is nil") + } + if src == nil { + return errors.New("graphics: src is nil") + } + + b := dst.Bounds() + srcb := src.Bounds() + if b.Empty() || srcb.Empty() { + return nil + } + sx := float64(b.Dx()) / float64(srcb.Dx()) + sy := float64(b.Dy()) / float64(srcb.Dy()) + return I.Scale(sx, sy).Transform(dst, src, interp.Bilinear) +} diff --git a/Godeps/_workspace/src/code.google.com/p/graphics-go/graphics/scale_test.go b/Godeps/_workspace/src/code.google.com/p/graphics-go/graphics/scale_test.go new file mode 100644 index 000000000..9c2468f11 --- /dev/null +++ b/Godeps/_workspace/src/code.google.com/p/graphics-go/graphics/scale_test.go @@ -0,0 +1,153 @@ +// Copyright 2011 The Graphics-Go Authors. All rights reserved. +// Use of this source code is governed by a BSD-style +// license that can be found in the LICENSE file. + +package graphics + +import ( + "code.google.com/p/graphics-go/graphics/graphicstest" + "image" + "testing" + + _ "image/png" +) + +var scaleOneColorTests = []transformOneColorTest{ + { + "down-half", + 1, 1, + 2, 2, + nil, + []uint8{ + 0x80, 0x00, + 0x00, 0x80, + }, + []uint8{ + 0x40, + }, + }, + { + "up-double", + 4, 4, + 2, 2, + nil, + []uint8{ + 0x80, 0x00, + 0x00, 0x80, + }, + []uint8{ + 0x80, 0x60, 0x20, 0x00, + 0x60, 0x50, 0x30, 0x20, + 0x20, 0x30, 0x50, 0x60, + 0x00, 0x20, 0x60, 0x80, + }, + }, + { + "up-doublewidth", + 4, 2, + 2, 2, + nil, + []uint8{ + 0x80, 0x00, + 0x00, 0x80, + }, + []uint8{ + 0x80, 0x60, 0x20, 0x00, + 0x00, 0x20, 0x60, 0x80, + }, + }, + { + "up-doubleheight", + 2, 4, + 2, 2, + nil, + []uint8{ + 0x80, 0x00, + 0x00, 0x80, + }, + []uint8{ + 0x80, 0x00, + 0x60, 0x20, + 0x20, 0x60, + 0x00, 0x80, + }, + }, + { + "up-partial", + 3, 3, + 2, 2, + nil, + []uint8{ + 0x80, 0x00, + 0x00, 0x80, + }, + []uint8{ + 0x80, 0x40, 0x00, + 0x40, 0x40, 0x40, + 0x00, 0x40, 0x80, + }, + }, +} + +func TestScaleOneColor(t *testing.T) { + for _, oc := range scaleOneColorTests { + dst := oc.newDst() + src := oc.newSrc() + if err := Scale(dst, src); err != nil { + t.Errorf("scale %s: %v", oc.desc, err) + continue + } + + if !checkTransformTest(t, &oc, dst) { + continue + } + } +} + +func TestScaleEmpty(t *testing.T) { + empty := image.NewRGBA(image.Rect(0, 0, 0, 0)) + if err := Scale(empty, empty); err != nil { + t.Fatal(err) + } +} + +func TestScaleGopher(t *testing.T) { + dst := image.NewRGBA(image.Rect(0, 0, 100, 150)) + + src, err := graphicstest.LoadImage("../testdata/gopher.png") + if err != nil { + t.Error(err) + return + } + + // Down-sample. + if err := Scale(dst, src); err != nil { + t.Fatal(err) + } + cmp, err := graphicstest.LoadImage("../testdata/gopher-100x150.png") + if err != nil { + t.Error(err) + return + } + err = graphicstest.ImageWithinTolerance(dst, cmp, 0) + if err != nil { + t.Error(err) + return + } + + // Up-sample. + dst = image.NewRGBA(image.Rect(0, 0, 500, 750)) + if err := Scale(dst, src); err != nil { + t.Fatal(err) + } + cmp, err = graphicstest.LoadImage("../testdata/gopher-500x750.png") + if err != nil { + t.Error(err) + return + } + err = graphicstest.ImageWithinTolerance(dst, cmp, 0) + if err != nil { + t.Error(err) + return + } +} diff --git a/Godeps/_workspace/src/code.google.com/p/graphics-go/graphics/shared_test.go b/Godeps/_workspace/src/code.google.com/p/graphics-go/graphics/shared_test.go new file mode 100644 index 000000000..e1cd21fb3 --- /dev/null +++ b/Godeps/_workspace/src/code.google.com/p/graphics-go/graphics/shared_test.go @@ -0,0 +1,69 @@ +// Copyright 2011 The Graphics-Go Authors. All rights reserved. +// Use of this source code is governed by a BSD-style +// license that can be found in the LICENSE file. + +package graphics + +import ( + "bytes" + "code.google.com/p/graphics-go/graphics/graphicstest" + "image" + "image/color" + "testing" +) + +type transformOneColorTest struct { + desc string + dstWidth int + dstHeight int + srcWidth int + srcHeight int + opt interface{} + src []uint8 + res []uint8 +} + +func (oc *transformOneColorTest) newSrc() *image.RGBA { + b := image.Rect(0, 0, oc.srcWidth, oc.srcHeight) + src := image.NewRGBA(b) + i := 0 + for y := b.Min.Y; y < b.Max.Y; y++ { + for x := b.Min.X; x < b.Max.X; x++ { + src.SetRGBA(x, y, color.RGBA{ + R: oc.src[i], + G: oc.src[i], + B: oc.src[i], + A: oc.src[i], + }) + i++ + } + } + return src +} + +func (oc *transformOneColorTest) newDst() *image.RGBA { + return image.NewRGBA(image.Rect(0, 0, oc.dstWidth, oc.dstHeight)) +} + +func checkTransformTest(t *testing.T, oc *transformOneColorTest, dst *image.RGBA) bool { + for ch := 0; ch < 4; ch++ { + i := 0 + res := make([]byte, len(oc.res)) + for y := 0; y < oc.dstHeight; y++ { + for x := 0; x < oc.dstWidth; x++ { + off := (y-dst.Rect.Min.Y)*dst.Stride + (x-dst.Rect.Min.X)*4 + res[i] = dst.Pix[off+ch] + i++ + } + } + + if !bytes.Equal(res, oc.res) { + got := graphicstest.SprintBox(res, oc.dstWidth, oc.dstHeight) + want := graphicstest.SprintBox(oc.res, oc.dstWidth, oc.dstHeight) + t.Errorf("%s: ch=%d\n got\n%s\n want\n%s", oc.desc, ch, got, want) + return false + } + } + + return true +} diff --git a/Godeps/_workspace/src/code.google.com/p/graphics-go/graphics/thumbnail.go b/Godeps/_workspace/src/code.google.com/p/graphics-go/graphics/thumbnail.go new file mode 100644 index 000000000..d3ad7e8f7 --- /dev/null +++ b/Godeps/_workspace/src/code.google.com/p/graphics-go/graphics/thumbnail.go @@ -0,0 +1,41 @@ +// Copyright 2011 The Graphics-Go Authors. All rights reserved. +// Use of this source code is governed by a BSD-style +// license that can be found in the LICENSE file. + +package graphics + +import ( + "image" + "image/draw" +) + +// Thumbnail scales and crops src so it fits in dst. +func Thumbnail(dst draw.Image, src image.Image) error { + // Scale down src in the dimension that is closer to dst. + sb := src.Bounds() + db := dst.Bounds() + rx := float64(sb.Dx()) / float64(db.Dx()) + ry := float64(sb.Dy()) / float64(db.Dy()) + var b image.Rectangle + if rx < ry { + b = image.Rect(0, 0, db.Dx(), int(float64(sb.Dy())/rx)) + } else { + b = image.Rect(0, 0, int(float64(sb.Dx())/ry), db.Dy()) + } + + buf := image.NewRGBA(b) + if err := Scale(buf, src); err != nil { + return err + } + + // Crop. + // TODO(crawshaw): improve on center-alignment. + var pt image.Point + if rx < ry { + pt.Y = (b.Dy() - db.Dy()) / 2 + } else { + pt.X = (b.Dx() - db.Dx()) / 2 + } + draw.Draw(dst, db, buf, pt, draw.Src) + return nil +} diff --git a/Godeps/_workspace/src/code.google.com/p/graphics-go/graphics/thumbnail_test.go b/Godeps/_workspace/src/code.google.com/p/graphics-go/graphics/thumbnail_test.go new file mode 100644 index 000000000..d12659f17 --- /dev/null +++ b/Godeps/_workspace/src/code.google.com/p/graphics-go/graphics/thumbnail_test.go @@ -0,0 +1,53 @@ +// Copyright 2011 The Graphics-Go Authors. All rights reserved. +// Use of this source code is governed by a BSD-style +// license that can be found in the LICENSE file. + +package graphics + +import ( + "code.google.com/p/graphics-go/graphics/graphicstest" + "image" + "testing" + + _ "image/png" +) + +func TestThumbnailGopher(t *testing.T) { + dst := image.NewRGBA(image.Rect(0, 0, 80, 80)) + + src, err := graphicstest.LoadImage("../testdata/gopher.png") + if err != nil { + t.Fatal(err) + } + if err := Thumbnail(dst, src); err != nil { + t.Fatal(err) + } + cmp, err := graphicstest.LoadImage("../testdata/gopher-thumb-80x80.png") + if err != nil { + t.Fatal(err) + } + err = graphicstest.ImageWithinTolerance(dst, cmp, 0) + if err != nil { + t.Error(err) + } +} + +func TestThumbnailLongGopher(t *testing.T) { + dst := image.NewRGBA(image.Rect(0, 0, 50, 150)) + + src, err := graphicstest.LoadImage("../testdata/gopher.png") + if err != nil { + t.Fatal(err) + } + if err := Thumbnail(dst, src); err != nil { + t.Fatal(err) + } + cmp, err := graphicstest.LoadImage("../testdata/gopher-thumb-50x150.png") + if err != nil { + t.Fatal(err) + } + err = graphicstest.ImageWithinTolerance(dst, cmp, 0) + if err != nil { + t.Error(err) + } +} diff --git a/Godeps/_workspace/src/github.com/rwcarlsen/goexif/exif/README.md b/Godeps/_workspace/src/github.com/rwcarlsen/goexif/exif/README.md new file mode 100644 index 000000000..b3bf5fa0e --- /dev/null +++ b/Godeps/_workspace/src/github.com/rwcarlsen/goexif/exif/README.md @@ -0,0 +1,4 @@ + +To regenerate the regression test data, run `go generate` inside the exif +package directory and commit the changes to *regress_expected_test.go*. + diff --git a/Godeps/_workspace/src/github.com/rwcarlsen/goexif/exif/example_test.go b/Godeps/_workspace/src/github.com/rwcarlsen/goexif/exif/example_test.go new file mode 100644 index 000000000..45fd5d4ad --- /dev/null +++ b/Godeps/_workspace/src/github.com/rwcarlsen/goexif/exif/example_test.go @@ -0,0 +1,42 @@ +package exif_test + +import ( + "fmt" + "log" + "os" + + "github.com/rwcarlsen/goexif/exif" + "github.com/rwcarlsen/goexif/mknote" +) + +func ExampleDecode() { + fname := "sample1.jpg" + + f, err := os.Open(fname) + if err != nil { + log.Fatal(err) + } + + // Optionally register camera makenote data parsing - currently Nikon and + // Canon are supported. + exif.RegisterParsers(mknote.All...) + + x, err := exif.Decode(f) + if err != nil { + log.Fatal(err) + } + + camModel, _ := x.Get(exif.Model) // normally, don't ignore errors! + fmt.Println(camModel.StringVal()) + + focal, _ := x.Get(exif.FocalLength) + numer, denom, _ := focal.Rat2(0) // retrieve first (only) rat. value + fmt.Printf("%v/%v", numer, denom) + + // Two convenience functions exist for date/time taken and GPS coords: + tm, _ := x.DateTime() + fmt.Println("Taken: ", tm) + + lat, long, _ := x.LatLong() + fmt.Println("lat, long: ", lat, ", ", long) +} diff --git a/Godeps/_workspace/src/github.com/rwcarlsen/goexif/exif/exif.go b/Godeps/_workspace/src/github.com/rwcarlsen/goexif/exif/exif.go new file mode 100644 index 000000000..b420729da --- /dev/null +++ b/Godeps/_workspace/src/github.com/rwcarlsen/goexif/exif/exif.go @@ -0,0 +1,619 @@ +// Package exif implements decoding of EXIF data as defined in the EXIF 2.2 +// specification (http://www.exif.org/Exif2-2.PDF). +package exif + +import ( + "bufio" + "bytes" + "encoding/binary" + "encoding/json" + "errors" + "fmt" + "io" + "io/ioutil" + "math" + "strconv" + "strings" + "time" + + "github.com/rwcarlsen/goexif/tiff" +) + +const ( + jpeg_APP1 = 0xE1 + + exifPointer = 0x8769 + gpsPointer = 0x8825 + interopPointer = 0xA005 +) + +// A decodeError is returned when the image cannot be decoded as a tiff image. +type decodeError struct { + cause error +} + +func (de decodeError) Error() string { + return fmt.Sprintf("exif: decode failed (%v) ", de.cause.Error()) +} + +// IsShortReadTagValueError identifies a ErrShortReadTagValue error. +func IsShortReadTagValueError(err error) bool { + de, ok := err.(decodeError) + if ok { + return de.cause == tiff.ErrShortReadTagValue + } + return false +} + +// A TagNotPresentError is returned when the requested field is not +// present in the EXIF. +type TagNotPresentError FieldName + +func (tag TagNotPresentError) Error() string { + return fmt.Sprintf("exif: tag %q is not present", string(tag)) +} + +func IsTagNotPresentError(err error) bool { + _, ok := err.(TagNotPresentError) + return ok +} + +// Parser allows the registration of custom parsing and field loading +// in the Decode function. +type Parser interface { + // Parse should read data from x and insert parsed fields into x via + // LoadTags. + Parse(x *Exif) error +} + +var parsers []Parser + +func init() { + RegisterParsers(&parser{}) +} + +// RegisterParsers registers one or more parsers to be automatically called +// when decoding EXIF data via the Decode function. +func RegisterParsers(ps ...Parser) { + parsers = append(parsers, ps...) +} + +type parser struct{} + +type tiffErrors map[tiffError]string + +func (te tiffErrors) Error() string { + var allErrors []string + for k, v := range te { + allErrors = append(allErrors, fmt.Sprintf("%s: %v\n", stagePrefix[k], v)) + } + return strings.Join(allErrors, "\n") +} + +// IsCriticalError, given the error returned by Decode, reports whether the +// returned *Exif may contain usable information. +func IsCriticalError(err error) bool { + _, ok := err.(tiffErrors) + return !ok +} + +// IsExifError reports whether the error happened while decoding the EXIF +// sub-IFD. +func IsExifError(err error) bool { + if te, ok := err.(tiffErrors); ok { + _, isExif := te[loadExif] + return isExif + } + return false +} + +// IsGPSError reports whether the error happened while decoding the GPS sub-IFD. +func IsGPSError(err error) bool { + if te, ok := err.(tiffErrors); ok { + _, isGPS := te[loadExif] + return isGPS + } + return false +} + +// IsInteroperabilityError reports whether the error happened while decoding the +// Interoperability sub-IFD. +func IsInteroperabilityError(err error) bool { + if te, ok := err.(tiffErrors); ok { + _, isInterop := te[loadInteroperability] + return isInterop + } + return false +} + +type tiffError int + +const ( + loadExif tiffError = iota + loadGPS + loadInteroperability +) + +var stagePrefix = map[tiffError]string{ + loadExif: "loading EXIF sub-IFD", + loadGPS: "loading GPS sub-IFD", + loadInteroperability: "loading Interoperability sub-IFD", +} + +// Parse reads data from the tiff data in x and populates the tags +// in x. If parsing a sub-IFD fails, the error is recorded and +// parsing continues with the remaining sub-IFDs. +func (p *parser) Parse(x *Exif) error { + x.LoadTags(x.Tiff.Dirs[0], exifFields, false) + + // thumbnails + if len(x.Tiff.Dirs) >= 2 { + x.LoadTags(x.Tiff.Dirs[1], thumbnailFields, false) + } + + te := make(tiffErrors) + + // recurse into exif, gps, and interop sub-IFDs + if err := loadSubDir(x, ExifIFDPointer, exifFields); err != nil { + te[loadExif] = err.Error() + } + if err := loadSubDir(x, GPSInfoIFDPointer, gpsFields); err != nil { + te[loadGPS] = err.Error() + } + + if err := loadSubDir(x, InteroperabilityIFDPointer, interopFields); err != nil { + te[loadInteroperability] = err.Error() + } + if len(te) > 0 { + return te + } + return nil +} + +func loadSubDir(x *Exif, ptr FieldName, fieldMap map[uint16]FieldName) error { + r := bytes.NewReader(x.Raw) + + tag, err := x.Get(ptr) + if err != nil { + return nil + } + offset, err := tag.Int64(0) + if err != nil { + return nil + } + + _, err = r.Seek(offset, 0) + if err != nil { + return fmt.Errorf("exif: seek to sub-IFD %s failed: %v", ptr, err) + } + subDir, _, err := tiff.DecodeDir(r, x.Tiff.Order) + if err != nil { + return fmt.Errorf("exif: sub-IFD %s decode failed: %v", ptr, err) + } + x.LoadTags(subDir, fieldMap, false) + return nil +} + +// Exif provides access to decoded EXIF metadata fields and values. +type Exif struct { + Tiff *tiff.Tiff + main map[FieldName]*tiff.Tag + Raw []byte +} + +// Decode parses EXIF-encoded data from r and returns a queryable Exif +// object. After the exif data section is called and the tiff structure +// decoded, each registered parser is called (in order of registration). If +// one parser returns an error, decoding terminates and the remaining +// parsers are not called. +// The error can be inspected with functions such as IsCriticalError to +// determine whether the returned object might still be usable. +func Decode(r io.Reader) (*Exif, error) { + // EXIF data in JPEG is stored in the APP1 marker. EXIF data uses the TIFF + // format to store data. + // If we're parsing a TIFF image, we don't need to strip away any data. + // If we're parsing a JPEG image, we need to strip away the JPEG APP1 + // marker and also the EXIF header. + + header := make([]byte, 4) + n, err := r.Read(header) + if err != nil { + return nil, err + } + if n < len(header) { + return nil, errors.New("exif: short read on header") + } + + var isTiff bool + switch string(header) { + case "II*\x00": + // TIFF - Little endian (Intel) + isTiff = true + case "MM\x00*": + // TIFF - Big endian (Motorola) + isTiff = true + default: + // Not TIFF, assume JPEG + } + + // Put the header bytes back into the reader. + r = io.MultiReader(bytes.NewReader(header), r) + var ( + er *bytes.Reader + tif *tiff.Tiff + ) + + if isTiff { + // Functions below need the IFDs from the TIFF data to be stored in a + // *bytes.Reader. We use TeeReader to get a copy of the bytes as a + // side-effect of tiff.Decode() doing its work. + b := &bytes.Buffer{} + tr := io.TeeReader(r, b) + tif, err = tiff.Decode(tr) + er = bytes.NewReader(b.Bytes()) + } else { + // Locate the JPEG APP1 header. + var sec *appSec + sec, err = newAppSec(jpeg_APP1, r) + if err != nil { + return nil, err + } + // Strip away EXIF header. + er, err = sec.exifReader() + if err != nil { + return nil, err + } + tif, err = tiff.Decode(er) + } + + if err != nil { + return nil, decodeError{cause: err} + } + + er.Seek(0, 0) + raw, err := ioutil.ReadAll(er) + if err != nil { + return nil, decodeError{cause: err} + } + + // build an exif structure from the tiff + x := &Exif{ + main: map[FieldName]*tiff.Tag{}, + Tiff: tif, + Raw: raw, + } + + for i, p := range parsers { + if err := p.Parse(x); err != nil { + if _, ok := err.(tiffErrors); ok { + return x, err + } + // This should never happen, as Parse always returns a tiffError + // for now, but that could change. + return x, fmt.Errorf("exif: parser %v failed (%v)", i, err) + } + } + + return x, nil +} + +// LoadTags loads tags into the available fields from the tiff Directory +// using the given tagid-fieldname mapping. Used to load makernote and +// other meta-data. If showMissing is true, tags in d that are not in the +// fieldMap will be loaded with the FieldName UnknownPrefix followed by the +// tag ID (in hex format). +func (x *Exif) LoadTags(d *tiff.Dir, fieldMap map[uint16]FieldName, showMissing bool) { + for _, tag := range d.Tags { + name := fieldMap[tag.Id] + if name == "" { + if !showMissing { + continue + } + name = FieldName(fmt.Sprintf("%v%x", UnknownPrefix, tag.Id)) + } + x.main[name] = tag + } +} + +// Get retrieves the EXIF tag for the given field name. +// +// If the tag is not known or not present, an error is returned. If the +// tag name is known, the error will be a TagNotPresentError. +func (x *Exif) Get(name FieldName) (*tiff.Tag, error) { + if tg, ok := x.main[name]; ok { + return tg, nil + } + return nil, TagNotPresentError(name) +} + +// Walker is the interface used to traverse all fields of an Exif object. +type Walker interface { + // Walk is called for each non-nil EXIF field. Returning a non-nil + // error aborts the walk/traversal. + Walk(name FieldName, tag *tiff.Tag) error +} + +// Walk calls the Walk method of w with the name and tag for every non-nil +// EXIF field. If w aborts the walk with an error, that error is returned. +func (x *Exif) Walk(w Walker) error { + for name, tag := range x.main { + if err := w.Walk(name, tag); err != nil { + return err + } + } + return nil +} + +// DateTime returns the EXIF's "DateTimeOriginal" field, which +// is the creation time of the photo. If not found, it tries +// the "DateTime" (which is meant as the modtime) instead. +// The error will be TagNotPresentErr if none of those tags +// were found, or a generic error if the tag value was +// not a string, or the error returned by time.Parse. +// +// If the EXIF lacks timezone information or GPS time, the returned +// time's Location will be time.Local. +func (x *Exif) DateTime() (time.Time, error) { + var dt time.Time + tag, err := x.Get(DateTimeOriginal) + if err != nil { + tag, err = x.Get(DateTime) + if err != nil { + return dt, err + } + } + if tag.Format() != tiff.StringVal { + return dt, errors.New("DateTime[Original] not in string format") + } + exifTimeLayout := "2006:01:02 15:04:05" + dateStr := strings.TrimRight(string(tag.Val), "\x00") + // TODO(bradfitz,mpl): look for timezone offset, GPS time, etc. + // For now, just always return the time.Local timezone. + return time.ParseInLocation(exifTimeLayout, dateStr, time.Local) +} + +func ratFloat(num, dem int64) float64 { + return float64(num) / float64(dem) +} + +// Tries to parse a Geo degrees value from a string as it was found in some +// EXIF data. +// Supported formats so far: +// - "52,00000,50,00000,34,01180" ==> 52 deg 50'34.0118" +// Probably due to locale the comma is used as decimal mark as well as the +// separator of three floats (degrees, minutes, seconds) +// http://en.wikipedia.org/wiki/Decimal_mark#Hindu.E2.80.93Arabic_numeral_system +// - "52.0,50.0,34.01180" ==> 52deg50'34.0118" +// - "52,50,34.01180" ==> 52deg50'34.0118" +func parseTagDegreesString(s string) (float64, error) { + const unparsableErrorFmt = "Unknown coordinate format: %s" + isSplitRune := func(c rune) bool { + return c == ',' || c == ';' + } + parts := strings.FieldsFunc(s, isSplitRune) + var degrees, minutes, seconds float64 + var err error + switch len(parts) { + case 6: + degrees, err = strconv.ParseFloat(parts[0]+"."+parts[1], 64) + if err != nil { + return 0.0, fmt.Errorf(unparsableErrorFmt, s) + } + minutes, err = strconv.ParseFloat(parts[2]+"."+parts[3], 64) + if err != nil { + return 0.0, fmt.Errorf(unparsableErrorFmt, s) + } + minutes = math.Copysign(minutes, degrees) + seconds, err = strconv.ParseFloat(parts[4]+"."+parts[5], 64) + if err != nil { + return 0.0, fmt.Errorf(unparsableErrorFmt, s) + } + seconds = math.Copysign(seconds, degrees) + case 3: + degrees, err = strconv.ParseFloat(parts[0], 64) + if err != nil { + return 0.0, fmt.Errorf(unparsableErrorFmt, s) + } + minutes, err = strconv.ParseFloat(parts[1], 64) + if err != nil { + return 0.0, fmt.Errorf(unparsableErrorFmt, s) + } + minutes = math.Copysign(minutes, degrees) + seconds, err = strconv.ParseFloat(parts[2], 64) + if err != nil { + return 0.0, fmt.Errorf(unparsableErrorFmt, s) + } + seconds = math.Copysign(seconds, degrees) + default: + return 0.0, fmt.Errorf(unparsableErrorFmt, s) + } + return degrees + minutes/60.0 + seconds/3600.0, nil +} + +func parse3Rat2(tag *tiff.Tag) ([3]float64, error) { + v := [3]float64{} + for i := range v { + num, den, err := tag.Rat2(i) + if err != nil { + return v, err + } + v[i] = ratFloat(num, den) + if tag.Count < uint32(i+2) { + break + } + } + return v, nil +} + +func tagDegrees(tag *tiff.Tag) (float64, error) { + switch tag.Format() { + case tiff.RatVal: + // The usual case, according to the Exif spec + // (http://www.kodak.com/global/plugins/acrobat/en/service/digCam/exifStandard2.pdf, + // sec 4.6.6, p. 52 et seq.) + v, err := parse3Rat2(tag) + if err != nil { + return 0.0, err + } + return v[0] + v[1]/60 + v[2]/3600.0, nil + case tiff.StringVal: + // Encountered this weird case with a panorama picture taken with a HTC phone + s, err := tag.StringVal() + if err != nil { + return 0.0, err + } + return parseTagDegreesString(s) + default: + // don't know how to parse value, give up + return 0.0, fmt.Errorf("Malformed EXIF Tag Degrees") + } +} + +// LatLong returns the latitude and longitude of the photo and +// whether it was present. +func (x *Exif) LatLong() (lat, long float64, err error) { + // All calls of x.Get might return an TagNotPresentError + longTag, err := x.Get(FieldName("GPSLongitude")) + if err != nil { + return + } + ewTag, err := x.Get(FieldName("GPSLongitudeRef")) + if err != nil { + return + } + latTag, err := x.Get(FieldName("GPSLatitude")) + if err != nil { + return + } + nsTag, err := x.Get(FieldName("GPSLatitudeRef")) + if err != nil { + return + } + if long, err = tagDegrees(longTag); err != nil { + return 0, 0, fmt.Errorf("Cannot parse longitude: %v", err) + } + if lat, err = tagDegrees(latTag); err != nil { + return 0, 0, fmt.Errorf("Cannot parse latitude: %v", err) + } + ew, err := ewTag.StringVal() + if err == nil && ew == "W" { + long *= -1.0 + } else if err != nil { + return 0, 0, fmt.Errorf("Cannot parse longitude: %v", err) + } + ns, err := nsTag.StringVal() + if err == nil && ns == "S" { + lat *= -1.0 + } else if err != nil { + return 0, 0, fmt.Errorf("Cannot parse longitude: %v", err) + } + return lat, long, nil +} + +// String returns a pretty text representation of the decoded exif data. +func (x *Exif) String() string { + var buf bytes.Buffer + for name, tag := range x.main { + fmt.Fprintf(&buf, "%s: %s\n", name, tag) + } + return buf.String() +} + +// JpegThumbnail returns the jpeg thumbnail if it exists. If it doesn't exist, +// TagNotPresentError will be returned +func (x *Exif) JpegThumbnail() ([]byte, error) { + offset, err := x.Get(ThumbJPEGInterchangeFormat) + if err != nil { + return nil, err + } + start, err := offset.Int(0) + if err != nil { + return nil, err + } + + length, err := x.Get(ThumbJPEGInterchangeFormatLength) + if err != nil { + return nil, err + } + l, err := length.Int(0) + if err != nil { + return nil, err + } + + return x.Raw[start : start+l], nil +} + +// MarshalJson implements the encoding/json.Marshaler interface providing output of +// all EXIF fields present (names and values). +func (x Exif) MarshalJSON() ([]byte, error) { + return json.Marshal(x.main) +} + +type appSec struct { + marker byte + data []byte +} + +// newAppSec finds marker in r and returns the corresponding application data +// section. +func newAppSec(marker byte, r io.Reader) (*appSec, error) { + br := bufio.NewReader(r) + app := &appSec{marker: marker} + var dataLen int + + // seek to marker + for dataLen == 0 { + if _, err := br.ReadBytes(0xFF); err != nil { + return nil, err + } + c, err := br.ReadByte() + if err != nil { + return nil, err + } else if c != marker { + continue + } + + dataLenBytes := make([]byte, 2) + for k,_ := range dataLenBytes { + c, err := br.ReadByte() + if err != nil { + return nil, err + } + dataLenBytes[k] = c + } + dataLen = int(binary.BigEndian.Uint16(dataLenBytes)) - 2 + } + + // read section data + nread := 0 + for nread < dataLen { + s := make([]byte, dataLen-nread) + n, err := br.Read(s) + nread += n + if err != nil && nread < dataLen { + return nil, err + } + app.data = append(app.data, s[:n]...) + } + return app, nil +} + +// reader returns a reader on this appSec. +func (app *appSec) reader() *bytes.Reader { + return bytes.NewReader(app.data) +} + +// exifReader returns a reader on this appSec with the read cursor advanced to +// the start of the exif's tiff encoded portion. +func (app *appSec) exifReader() (*bytes.Reader, error) { + if len(app.data) < 6 { + return nil, errors.New("exif: failed to find exif intro marker") + } + + // read/check for exif special mark + exif := app.data[:6] + if !bytes.Equal(exif, append([]byte("Exif"), 0x00, 0x00)) { + return nil, errors.New("exif: failed to find exif intro marker") + } + return bytes.NewReader(app.data[6:]), nil +} diff --git a/Godeps/_workspace/src/github.com/rwcarlsen/goexif/exif/exif_test.go b/Godeps/_workspace/src/github.com/rwcarlsen/goexif/exif/exif_test.go new file mode 100644 index 000000000..c53f1ddda --- /dev/null +++ b/Godeps/_workspace/src/github.com/rwcarlsen/goexif/exif/exif_test.go @@ -0,0 +1,202 @@ +package exif + +//go:generate go run regen_regress.go -- regress_expected_test.go +//go:generate go fmt regress_expected_test.go + +import ( + "flag" + "fmt" + "math" + "os" + "path/filepath" + "strings" + "testing" + + "github.com/rwcarlsen/goexif/tiff" +) + +var dataDir = flag.String("test_data_dir", ".", "Directory where the data files for testing are located") + +func TestDecode(t *testing.T) { + fpath := filepath.Join(*dataDir, "samples") + f, err := os.Open(fpath) + if err != nil { + t.Fatalf("Could not open sample directory '%s': %v", fpath, err) + } + + names, err := f.Readdirnames(0) + if err != nil { + t.Fatalf("Could not read sample directory '%s': %v", fpath, err) + } + + cnt := 0 + for _, name := range names { + if !strings.HasSuffix(name, ".jpg") { + t.Logf("skipping non .jpg file %v", name) + continue + } + t.Logf("testing file %v", name) + f, err := os.Open(filepath.Join(fpath, name)) + if err != nil { + t.Fatal(err) + } + + x, err := Decode(f) + if err != nil { + t.Fatal(err) + } else if x == nil { + t.Fatalf("No error and yet %v was not decoded", name) + } + + t.Logf("checking pic %v", name) + x.Walk(&walker{name, t}) + cnt++ + } + if cnt != len(regressExpected) { + t.Errorf("Did not process enough samples, got %d, want %d", cnt, len(regressExpected)) + } +} + +type walker struct { + picName string + t *testing.T +} + +func (w *walker) Walk(field FieldName, tag *tiff.Tag) error { + // this needs to be commented out when regenerating regress expected vals + pic := regressExpected[w.picName] + if pic == nil { + w.t.Errorf(" regression data not found") + return nil + } + + exp, ok := pic[field] + if !ok { + w.t.Errorf(" regression data does not have field %v", field) + return nil + } + + s := tag.String() + if tag.Count == 1 && s != "\"\"" { + s = fmt.Sprintf("[%s]", s) + } + got := tag.String() + + if exp != got { + fmt.Println("s: ", s) + fmt.Printf("len(s)=%v\n", len(s)) + w.t.Errorf(" field %v bad tag: expected '%s', got '%s'", field, exp, got) + } + return nil +} + +func TestMarshal(t *testing.T) { + name := filepath.Join(*dataDir, "sample1.jpg") + f, err := os.Open(name) + if err != nil { + t.Fatalf("%v\n", err) + } + defer f.Close() + + x, err := Decode(f) + if err != nil { + t.Fatal(err) + } + if x == nil { + t.Fatal("bad err") + } + + b, err := x.MarshalJSON() + if err != nil { + t.Fatal(err) + } + + t.Logf("%s", b) +} + +func testSingleParseDegreesString(t *testing.T, s string, w float64) { + g, err := parseTagDegreesString(s) + if err != nil { + t.Fatal(err) + } + if math.Abs(w-g) > 1e-10 { + t.Errorf("Wrong parsing result %s: Want %.12f, got %.12f", s, w, g) + } +} + +func TestParseTagDegreesString(t *testing.T) { + // semicolon as decimal mark + testSingleParseDegreesString(t, "52,00000,50,00000,34,01180", 52.842781055556) // comma as separator + testSingleParseDegreesString(t, "52,00000;50,00000;34,01180", 52.842781055556) // semicolon as separator + + // point as decimal mark + testSingleParseDegreesString(t, "14.00000,44.00000,34.01180", 14.742781055556) // comma as separator + testSingleParseDegreesString(t, "14.00000;44.00000;34.01180", 14.742781055556) // semicolon as separator + testSingleParseDegreesString(t, "14.00000;44.00000,34.01180", 14.742781055556) // mixed separators + + testSingleParseDegreesString(t, "-008.0,30.0,03.6", -8.501) // leading zeros + + // no decimal places + testSingleParseDegreesString(t, "-10,15,54", -10.265) + testSingleParseDegreesString(t, "-10;15;54", -10.265) + + // incorrect mix of comma and point as decimal mark + s := "-17,00000,15.00000,04.80000" + if _, err := parseTagDegreesString(s); err == nil { + t.Error("parseTagDegreesString: false positive for " + s) + } +} + +// Make sure we error out early when a tag had a count of MaxUint32 +func TestMaxUint32CountError(t *testing.T) { + name := filepath.Join(*dataDir, "corrupt/max_uint32_exif.jpg") + f, err := os.Open(name) + if err != nil { + t.Fatalf("%v\n", err) + } + defer f.Close() + + _, err = Decode(f) + if err == nil { + t.Fatal("no error on bad exif data") + } + if !strings.Contains(err.Error(), "invalid Count offset") { + t.Fatal("wrong error:", err.Error()) + } +} + +// Make sure we error out early with tag data sizes larger than the image file +func TestHugeTagError(t *testing.T) { + name := filepath.Join(*dataDir, "corrupt/huge_tag_exif.jpg") + f, err := os.Open(name) + if err != nil { + t.Fatalf("%v\n", err) + } + defer f.Close() + + _, err = Decode(f) + if err == nil { + t.Fatal("no error on bad exif data") + } + if !strings.Contains(err.Error(), "short read") { + t.Fatal("wrong error:", err.Error()) + } +} + +// Check for a 0-length tag value +func TestZeroLengthTagError(t *testing.T) { + name := filepath.Join(*dataDir, "corrupt/infinite_loop_exif.jpg") + f, err := os.Open(name) + if err != nil { + t.Fatalf("%v\n", err) + } + defer f.Close() + + _, err = Decode(f) + if err == nil { + t.Fatal("no error on bad exif data") + } + if !strings.Contains(err.Error(), "zero length tag value") { + t.Fatal("wrong error:", err.Error()) + } +} diff --git a/Godeps/_workspace/src/github.com/rwcarlsen/goexif/exif/fields.go b/Godeps/_workspace/src/github.com/rwcarlsen/goexif/exif/fields.go new file mode 100644 index 000000000..0388d2390 --- /dev/null +++ b/Godeps/_workspace/src/github.com/rwcarlsen/goexif/exif/fields.go @@ -0,0 +1,293 @@ +package exif + +type FieldName string + +// UnknownPrefix is used as the first part of field names for decoded tags for +// which there is no known/supported EXIF field. +const UnknownPrefix = "UnknownTag_" + +// Primary EXIF fields +const ( + ImageWidth FieldName = "ImageWidth" + ImageLength = "ImageLength" // Image height called Length by EXIF spec + BitsPerSample = "BitsPerSample" + Compression = "Compression" + PhotometricInterpretation = "PhotometricInterpretation" + Orientation = "Orientation" + SamplesPerPixel = "SamplesPerPixel" + PlanarConfiguration = "PlanarConfiguration" + YCbCrSubSampling = "YCbCrSubSampling" + YCbCrPositioning = "YCbCrPositioning" + XResolution = "XResolution" + YResolution = "YResolution" + ResolutionUnit = "ResolutionUnit" + DateTime = "DateTime" + ImageDescription = "ImageDescription" + Make = "Make" + Model = "Model" + Software = "Software" + Artist = "Artist" + Copyright = "Copyright" + ExifIFDPointer = "ExifIFDPointer" + GPSInfoIFDPointer = "GPSInfoIFDPointer" + InteroperabilityIFDPointer = "InteroperabilityIFDPointer" + ExifVersion = "ExifVersion" + FlashpixVersion = "FlashpixVersion" + ColorSpace = "ColorSpace" + ComponentsConfiguration = "ComponentsConfiguration" + CompressedBitsPerPixel = "CompressedBitsPerPixel" + PixelXDimension = "PixelXDimension" + PixelYDimension = "PixelYDimension" + MakerNote = "MakerNote" + UserComment = "UserComment" + RelatedSoundFile = "RelatedSoundFile" + DateTimeOriginal = "DateTimeOriginal" + DateTimeDigitized = "DateTimeDigitized" + SubSecTime = "SubSecTime" + SubSecTimeOriginal = "SubSecTimeOriginal" + SubSecTimeDigitized = "SubSecTimeDigitized" + ImageUniqueID = "ImageUniqueID" + ExposureTime = "ExposureTime" + FNumber = "FNumber" + ExposureProgram = "ExposureProgram" + SpectralSensitivity = "SpectralSensitivity" + ISOSpeedRatings = "ISOSpeedRatings" + OECF = "OECF" + ShutterSpeedValue = "ShutterSpeedValue" + ApertureValue = "ApertureValue" + BrightnessValue = "BrightnessValue" + ExposureBiasValue = "ExposureBiasValue" + MaxApertureValue = "MaxApertureValue" + SubjectDistance = "SubjectDistance" + MeteringMode = "MeteringMode" + LightSource = "LightSource" + Flash = "Flash" + FocalLength = "FocalLength" + SubjectArea = "SubjectArea" + FlashEnergy = "FlashEnergy" + SpatialFrequencyResponse = "SpatialFrequencyResponse" + FocalPlaneXResolution = "FocalPlaneXResolution" + FocalPlaneYResolution = "FocalPlaneYResolution" + FocalPlaneResolutionUnit = "FocalPlaneResolutionUnit" + SubjectLocation = "SubjectLocation" + ExposureIndex = "ExposureIndex" + SensingMethod = "SensingMethod" + FileSource = "FileSource" + SceneType = "SceneType" + CFAPattern = "CFAPattern" + CustomRendered = "CustomRendered" + ExposureMode = "ExposureMode" + WhiteBalance = "WhiteBalance" + DigitalZoomRatio = "DigitalZoomRatio" + FocalLengthIn35mmFilm = "FocalLengthIn35mmFilm" + SceneCaptureType = "SceneCaptureType" + GainControl = "GainControl" + Contrast = "Contrast" + Saturation = "Saturation" + Sharpness = "Sharpness" + DeviceSettingDescription = "DeviceSettingDescription" + SubjectDistanceRange = "SubjectDistanceRange" + LensMake = "LensMake" + LensModel = "LensModel" +) + +// thumbnail fields +const ( + ThumbJPEGInterchangeFormat = "ThumbJPEGInterchangeFormat" // offset to thumb jpeg SOI + ThumbJPEGInterchangeFormatLength = "ThumbJPEGInterchangeFormatLength" // byte length of thumb +) + +// GPS fields +const ( + GPSVersionID FieldName = "GPSVersionID" + GPSLatitudeRef = "GPSLatitudeRef" + GPSLatitude = "GPSLatitude" + GPSLongitudeRef = "GPSLongitudeRef" + GPSLongitude = "GPSLongitude" + GPSAltitudeRef = "GPSAltitudeRef" + GPSAltitude = "GPSAltitude" + GPSTimeStamp = "GPSTimeStamp" + GPSSatelites = "GPSSatelites" + GPSStatus = "GPSStatus" + GPSMeasureMode = "GPSMeasureMode" + GPSDOP = "GPSDOP" + GPSSpeedRef = "GPSSpeedRef" + GPSSpeed = "GPSSpeed" + GPSTrackRef = "GPSTrackRef" + GPSTrack = "GPSTrack" + GPSImgDirectionRef = "GPSImgDirectionRef" + GPSImgDirection = "GPSImgDirection" + GPSMapDatum = "GPSMapDatum" + GPSDestLatitudeRef = "GPSDestLatitudeRef" + GPSDestLatitude = "GPSDestLatitude" + GPSDestLongitudeRef = "GPSDestLongitudeRef" + GPSDestLongitude = "GPSDestLongitude" + GPSDestBearingRef = "GPSDestBearingRef" + GPSDestBearing = "GPSDestBearing" + GPSDestDistanceRef = "GPSDestDistanceRef" + GPSDestDistance = "GPSDestDistance" + GPSProcessingMethod = "GPSProcessingMethod" + GPSAreaInformation = "GPSAreaInformation" + GPSDateStamp = "GPSDateStamp" + GPSDifferential = "GPSDifferential" +) + +// interoperability fields +const ( + InteroperabilityIndex FieldName = "InteroperabilityIndex" +) + +var exifFields = map[uint16]FieldName{ + ///////////////////////////////////// + ////////// IFD 0 //////////////////// + ///////////////////////////////////// + + // image data structure for the thumbnail + 0x0100: ImageWidth, + 0x0101: ImageLength, + 0x0102: BitsPerSample, + 0x0103: Compression, + 0x0106: PhotometricInterpretation, + 0x0112: Orientation, + 0x0115: SamplesPerPixel, + 0x011C: PlanarConfiguration, + 0x0212: YCbCrSubSampling, + 0x0213: YCbCrPositioning, + 0x011A: XResolution, + 0x011B: YResolution, + 0x0128: ResolutionUnit, + + // Other tags + 0x0132: DateTime, + 0x010E: ImageDescription, + 0x010F: Make, + 0x0110: Model, + 0x0131: Software, + 0x013B: Artist, + 0x8298: Copyright, + + // private tags + exifPointer: ExifIFDPointer, + + ///////////////////////////////////// + ////////// Exif sub IFD ///////////// + ///////////////////////////////////// + + gpsPointer: GPSInfoIFDPointer, + interopPointer: InteroperabilityIFDPointer, + + 0x9000: ExifVersion, + 0xA000: FlashpixVersion, + + 0xA001: ColorSpace, + + 0x9101: ComponentsConfiguration, + 0x9102: CompressedBitsPerPixel, + 0xA002: PixelXDimension, + 0xA003: PixelYDimension, + + 0x927C: MakerNote, + 0x9286: UserComment, + + 0xA004: RelatedSoundFile, + 0x9003: DateTimeOriginal, + 0x9004: DateTimeDigitized, + 0x9290: SubSecTime, + 0x9291: SubSecTimeOriginal, + 0x9292: SubSecTimeDigitized, + + 0xA420: ImageUniqueID, + + // picture conditions + 0x829A: ExposureTime, + 0x829D: FNumber, + 0x8822: ExposureProgram, + 0x8824: SpectralSensitivity, + 0x8827: ISOSpeedRatings, + 0x8828: OECF, + 0x9201: ShutterSpeedValue, + 0x9202: ApertureValue, + 0x9203: BrightnessValue, + 0x9204: ExposureBiasValue, + 0x9205: MaxApertureValue, + 0x9206: SubjectDistance, + 0x9207: MeteringMode, + 0x9208: LightSource, + 0x9209: Flash, + 0x920A: FocalLength, + 0x9214: SubjectArea, + 0xA20B: FlashEnergy, + 0xA20C: SpatialFrequencyResponse, + 0xA20E: FocalPlaneXResolution, + 0xA20F: FocalPlaneYResolution, + 0xA210: FocalPlaneResolutionUnit, + 0xA214: SubjectLocation, + 0xA215: ExposureIndex, + 0xA217: SensingMethod, + 0xA300: FileSource, + 0xA301: SceneType, + 0xA302: CFAPattern, + 0xA401: CustomRendered, + 0xA402: ExposureMode, + 0xA403: WhiteBalance, + 0xA404: DigitalZoomRatio, + 0xA405: FocalLengthIn35mmFilm, + 0xA406: SceneCaptureType, + 0xA407: GainControl, + 0xA408: Contrast, + 0xA409: Saturation, + 0xA40A: Sharpness, + 0xA40B: DeviceSettingDescription, + 0xA40C: SubjectDistanceRange, + 0xA433: LensMake, + 0xA434: LensModel, +} + +var gpsFields = map[uint16]FieldName{ + ///////////////////////////////////// + //// GPS sub-IFD //////////////////// + ///////////////////////////////////// + 0x0: GPSVersionID, + 0x1: GPSLatitudeRef, + 0x2: GPSLatitude, + 0x3: GPSLongitudeRef, + 0x4: GPSLongitude, + 0x5: GPSAltitudeRef, + 0x6: GPSAltitude, + 0x7: GPSTimeStamp, + 0x8: GPSSatelites, + 0x9: GPSStatus, + 0xA: GPSMeasureMode, + 0xB: GPSDOP, + 0xC: GPSSpeedRef, + 0xD: GPSSpeed, + 0xE: GPSTrackRef, + 0xF: GPSTrack, + 0x10: GPSImgDirectionRef, + 0x11: GPSImgDirection, + 0x12: GPSMapDatum, + 0x13: GPSDestLatitudeRef, + 0x14: GPSDestLatitude, + 0x15: GPSDestLongitudeRef, + 0x16: GPSDestLongitude, + 0x17: GPSDestBearingRef, + 0x18: GPSDestBearing, + 0x19: GPSDestDistanceRef, + 0x1A: GPSDestDistance, + 0x1B: GPSProcessingMethod, + 0x1C: GPSAreaInformation, + 0x1D: GPSDateStamp, + 0x1E: GPSDifferential, +} + +var interopFields = map[uint16]FieldName{ + ///////////////////////////////////// + //// Interoperability sub-IFD /////// + ///////////////////////////////////// + 0x1: InteroperabilityIndex, +} + +var thumbnailFields = map[uint16]FieldName{ + 0x0201: ThumbJPEGInterchangeFormat, + 0x0202: ThumbJPEGInterchangeFormatLength, +} diff --git a/Godeps/_workspace/src/github.com/rwcarlsen/goexif/exif/regen_regress.go b/Godeps/_workspace/src/github.com/rwcarlsen/goexif/exif/regen_regress.go new file mode 100644 index 000000000..17bac5287 --- /dev/null +++ b/Godeps/_workspace/src/github.com/rwcarlsen/goexif/exif/regen_regress.go @@ -0,0 +1,79 @@ +// +build ignore + +package main + +import ( + "flag" + "fmt" + "io" + "log" + "os" + "path/filepath" + "strings" + + "github.com/rwcarlsen/goexif/exif" + "github.com/rwcarlsen/goexif/tiff" +) + +func main() { + flag.Parse() + fname := flag.Arg(0) + + dst, err := os.Create(fname) + if err != nil { + log.Fatal(err) + } + defer dst.Close() + + dir, err := os.Open("samples") + if err != nil { + log.Fatal(err) + } + defer dir.Close() + + names, err := dir.Readdirnames(0) + if err != nil { + log.Fatal(err) + } + for i, name := range names { + names[i] = filepath.Join("samples", name) + } + makeExpected(names, dst) +} + +func makeExpected(files []string, w io.Writer) { + fmt.Fprintf(w, "package exif\n\n") + fmt.Fprintf(w, "var regressExpected = map[string]map[FieldName]string{\n") + + for _, name := range files { + f, err := os.Open(name) + if err != nil { + continue + } + + x, err := exif.Decode(f) + if err != nil { + f.Close() + continue + } + + fmt.Fprintf(w, "\"%v\": map[FieldName]string{\n", filepath.Base(name)) + x.Walk(®resswalk{w}) + fmt.Fprintf(w, "},\n") + f.Close() + } + fmt.Fprintf(w, "}") +} + +type regresswalk struct { + wr io.Writer +} + +func (w *regresswalk) Walk(name exif.FieldName, tag *tiff.Tag) error { + if strings.HasPrefix(string(name), exif.UnknownPrefix) { + fmt.Fprintf(w.wr, "\"%v\": `%v`,\n", name, tag.String()) + } else { + fmt.Fprintf(w.wr, "%v: `%v`,\n", name, tag.String()) + } + return nil +} diff --git a/Godeps/_workspace/src/github.com/rwcarlsen/goexif/exif/regress_expected_test.go b/Godeps/_workspace/src/github.com/rwcarlsen/goexif/exif/regress_expected_test.go new file mode 100644 index 000000000..bf3998189 --- /dev/null +++ b/Godeps/_workspace/src/github.com/rwcarlsen/goexif/exif/regress_expected_test.go @@ -0,0 +1,2293 @@ +package exif + +var regressExpected = map[string]map[FieldName]string{ + "2004-01-11-22-45-15-sep-2004-01-11-22-45-15a.jpg": map[FieldName]string{ + PixelXDimension: `1600`, + InteroperabilityIFDPointer: `1009`, + SceneType: `""`, + InteroperabilityIndex: `"R98"`, + Make: `"Samsung Techwin"`, + DateTimeOriginal: `"2004:01:11 22:45:15"`, + DateTimeDigitized: `"2004:01:11 22:45:15"`, + ImageDescription: `"SAMSUNG DIGITAL CAMERA "`, + ExifVersion: `"0220"`, + MeteringMode: `2`, + Flash: `1`, + Orientation: `1`, + ResolutionUnit: `2`, + YCbCrPositioning: `2`, + FlashpixVersion: `"0100"`, + YResolution: `"72/1"`, + ThumbJPEGInterchangeFormat: `1039`, + MaxApertureValue: `"32/10"`, + ExposureProgram: `2`, + Software: `"M5011S-1031"`, + DateTime: `"2004:01:11 22:45:19"`, + FNumber: `"320/100"`, + ISOSpeedRatings: `150`, + ComponentsConfiguration: `""`, + CompressedBitsPerPixel: `"2/1"`, + RelatedSoundFile: `""`, + XResolution: `"72/1"`, + ExifIFDPointer: `251`, + ExposureTime: `"1000/30000"`, + LightSource: `0`, + FocalLength: `"82/11"`, + ColorSpace: `1`, + PixelYDimension: `1200`, + FileSource: `""`, + Model: `"U-CA 501"`, + ThumbJPEGInterchangeFormatLength: `3530`, + ExposureBiasValue: `"95/10"`, + }, + "2006-08-03-16-29-38-sep-2006-08-03-16-29-38a.jpg": map[FieldName]string{ + ThumbJPEGInterchangeFormat: `5108`, + ThumbJPEGInterchangeFormatLength: `4323`, + MaxApertureValue: `"95/32"`, + ResolutionUnit: `2`, + YCbCrPositioning: `1`, + ExifIFDPointer: `196`, + ExposureTime: `"1/1500"`, + InteroperabilityIndex: `"R98"`, + FocalPlaneXResolution: `"2816000/225"`, + YResolution: `"180/1"`, + DateTime: `"2006:08:03 16:29:38"`, + ShutterSpeedValue: `"338/32"`, + ApertureValue: `"95/32"`, + FocalLength: `"5800/1000"`, + FlashpixVersion: `"0100"`, + Make: `"Canon"`, + DateTimeOriginal: `"2006:08:03 16:29:38"`, + ComponentsConfiguration: `""`, + InteroperabilityIFDPointer: `2824`, + ExposureMode: `0`, + SceneCaptureType: `0`, + FNumber: `"28/10"`, + ColorSpace: `1`, + FileSource: `""`, + WhiteBalance: `0`, + SensingMethod: `2`, + DateTimeDigitized: `"2006:08:03 16:29:38"`, + CompressedBitsPerPixel: `"5/1"`, + MeteringMode: `5`, + MakerNote: `""`, + UserComment: `""`, + PixelXDimension: `2816`, + Model: `"Canon PowerShot SD600"`, + ExposureBiasValue: `"0/3"`, + PixelYDimension: `2112`, + FocalPlaneResolutionUnit: `2`, + DigitalZoomRatio: `"2816/2816"`, + Orientation: `6`, + XResolution: `"180/1"`, + ExifVersion: `"0220"`, + Flash: `24`, + FocalPlaneYResolution: `"2112000/169"`, + CustomRendered: `0`, + }, + "2006-11-11-19-17-56-sep-2006-11-11-19-17-56a.jpg": map[FieldName]string{ + FNumber: `"28/10"`, + ExposureProgram: `2`, + Software: `"E3200v1.1"`, + DateTime: `"2006:11:11 19:17:56"`, + ExposureTime: `"10/601"`, + ISOSpeedRatings: `50`, + ComponentsConfiguration: `""`, + CompressedBitsPerPixel: `"4/1"`, + Saturation: `0`, + XResolution: `"300/1"`, + ExifIFDPointer: `284`, + ExposureBiasValue: `"0/10"`, + LightSource: `0`, + FocalLength: `"58/10"`, + ColorSpace: `1`, + PixelYDimension: `1536`, + FileSource: `""`, + Model: `"E3200"`, + ThumbJPEGInterchangeFormatLength: `4546`, + DateTimeDigitized: `"2006:11:11 19:17:56"`, + PixelXDimension: `2048`, + InteroperabilityIFDPointer: `1026`, + SceneType: `""`, + DigitalZoomRatio: `"0/100"`, + GainControl: `0`, + Make: `"NIKON"`, + DateTimeOriginal: `"2006:11:11 19:17:56"`, + InteroperabilityIndex: `"R98"`, + ImageDescription: `" "`, + Sharpness: `0`, + YCbCrPositioning: `2`, + ExifVersion: `"0220"`, + MeteringMode: `5`, + Flash: `25`, + FocalLengthIn35mmFilm: `38`, + SubjectDistanceRange: `0`, + Orientation: `1`, + ResolutionUnit: `2`, + MaxApertureValue: `"30/10"`, + FlashpixVersion: `"0100"`, + WhiteBalance: `0`, + YResolution: `"300/1"`, + ThumbJPEGInterchangeFormat: `4596`, + CustomRendered: `1`, + ExposureMode: `0`, + SceneCaptureType: `0`, + Contrast: `0`, + MakerNote: `""`, + UserComment: `" "`, + }, + "2006-12-10-23-58-20-sep-2006-12-10-23-58-20a.jpg": map[FieldName]string{ + Model: `"Canon PowerShot A80"`, + ExposureBiasValue: `"0/3"`, + PixelYDimension: `1704`, + FocalPlaneResolutionUnit: `2`, + FocalPlaneYResolution: `"1704000/210"`, + CustomRendered: `0`, + DigitalZoomRatio: `"2272/2272"`, + Orientation: `1`, + XResolution: `"180/1"`, + ExifVersion: `"0220"`, + Flash: `24`, + ThumbJPEGInterchangeFormat: `2036`, + ThumbJPEGInterchangeFormatLength: `6465`, + MaxApertureValue: `"95/32"`, + InteroperabilityIndex: `"R98"`, + ResolutionUnit: `2`, + YCbCrPositioning: `1`, + ExifIFDPointer: `196`, + ExposureTime: `"1/80"`, + FocalLength: `"250/32"`, + FlashpixVersion: `"0100"`, + FocalPlaneXResolution: `"2272000/280"`, + YResolution: `"180/1"`, + DateTime: `"2006:12:10 23:58:20"`, + ShutterSpeedValue: `"202/32"`, + ApertureValue: `"95/32"`, + ExposureMode: `0`, + SceneCaptureType: `0`, + Make: `"Canon"`, + DateTimeOriginal: `"2006:12:10 23:58:20"`, + ComponentsConfiguration: `""`, + InteroperabilityIFDPointer: `1844`, + FNumber: `"28/10"`, + ColorSpace: `1`, + FileSource: `""`, + WhiteBalance: `0`, + UserComment: `""`, + PixelXDimension: `2272`, + SensingMethod: `2`, + DateTimeDigitized: `"2006:12:10 23:58:20"`, + CompressedBitsPerPixel: `"3/1"`, + MeteringMode: `5`, + MakerNote: `""`, + }, + "2006-12-17-07-09-14-sep-2006-12-17-07-09-14a.jpg": map[FieldName]string{ + WhiteBalance: `0`, + YResolution: `"72/1"`, + ThumbJPEGInterchangeFormatLength: `7063`, + ExposureBiasValue: `"0/10"`, + FlashpixVersion: `"0100"`, + PixelYDimension: `1536`, + ExposureMode: `0`, + InteroperabilityIndex: `"R98"`, + Make: `"PENTAX Corporation"`, + DateTimeDigitized: `"2006:12:17 07:09:14"`, + PixelXDimension: `2048`, + InteroperabilityIFDPointer: `31048`, + CustomRendered: `0`, + DateTime: `"2006:12:17 07:09:14"`, + ExposureProgram: `2`, + FocalLengthIn35mmFilm: `38`, + Saturation: `0`, + XResolution: `"72/1"`, + ISOSpeedRatings: `64`, + ExifVersion: `"0220"`, + CompressedBitsPerPixel: `"5725504/3145728"`, + Flash: `24`, + Model: `"PENTAX Optio S6"`, + ThumbJPEGInterchangeFormat: `31172`, + MaxApertureValue: `"27/10"`, + FocalLength: `"62/10"`, + ColorSpace: `1`, + DateTimeOriginal: `"2006:12:17 07:09:14"`, + MakerNote: `""`, + DigitalZoomRatio: `"100/100"`, + SceneCaptureType: `0`, + Contrast: `0`, + Software: `"Optio S6 Ver 1.00"`, + FNumber: `"270/100"`, + Sharpness: `0`, + ComponentsConfiguration: `""`, + MeteringMode: `5`, + SubjectDistanceRange: `2`, + Orientation: `1`, + ResolutionUnit: `2`, + YCbCrPositioning: `2`, + ExifIFDPointer: `586`, + ExposureTime: `"1/160"`, + }, + "2006-12-21-15-55-26-sep-2006-12-21-15-55-26a.jpg": map[FieldName]string{ + DateTimeDigitized: `"2006:12:21 15:55:26"`, + CompressedBitsPerPixel: `"8/1"`, + MeteringMode: `3`, + MakerNote: `""`, + PixelXDimension: `2592`, + Saturation: `0`, + ImageDescription: `" "`, + Model: `"DSC-W15"`, + ExposureBiasValue: `"-20/10"`, + PixelYDimension: `1944`, + Orientation: `1`, + XResolution: `"72/1"`, + ISOSpeedRatings: `100`, + ExifVersion: `"0220"`, + Flash: `79`, + CustomRendered: `0`, + ThumbJPEGInterchangeFormat: `2484`, + ThumbJPEGInterchangeFormatLength: `13571`, + ExposureProgram: `2`, + MaxApertureValue: `"48/16"`, + ResolutionUnit: `2`, + YCbCrPositioning: `2`, + ExifIFDPointer: `256`, + ExposureTime: `"10/400"`, + SceneType: `""`, + InteroperabilityIndex: `"R98"`, + YResolution: `"72/1"`, + DateTime: `"2006:12:21 15:55:26"`, + LightSource: `0`, + FocalLength: `"79/10"`, + FlashpixVersion: `"0100"`, + Contrast: `0`, + Make: `"SONY"`, + DateTimeOriginal: `"2006:12:21 15:55:26"`, + ComponentsConfiguration: `""`, + InteroperabilityIFDPointer: `2278`, + ExposureMode: `1`, + SceneCaptureType: `0`, + FNumber: `"28/10"`, + ColorSpace: `1`, + FileSource: `""`, + WhiteBalance: `0`, + Sharpness: `0`, + }, + "2007-01-01-12-00-00-sep-2007-01-01-12-00-00a.jpg": map[FieldName]string{ + MaxApertureValue: `"286/100"`, + ExposureIndex: `"200/1"`, + ThumbJPEGInterchangeFormat: `13848`, + ThumbJPEGInterchangeFormatLength: `3436`, + ExposureProgram: `2`, + ExposureTime: `"8942/1000000"`, + SceneType: `""`, + InteroperabilityIndex: `"R98"`, + ResolutionUnit: `2`, + YCbCrPositioning: `2`, + ExifIFDPointer: `340`, + ApertureValue: `"286/100"`, + LightSource: `0`, + FocalLength: `"60/10"`, + FlashpixVersion: `"0100"`, + YResolution: `"480/1"`, + Software: `"KODAK EASYSHARE C713 ZOOM DIGITAL CAMERA"`, + ShutterSpeedValue: `"680/100"`, + InteroperabilityIFDPointer: `13816`, + ExposureMode: `0`, + FocalLengthIn35mmFilm: `36`, + SceneCaptureType: `0`, + Contrast: `0`, + Make: `"EASTMAN KODAK COMPANY"`, + DateTimeOriginal: `"2007:01:01 12:00:00"`, + ComponentsConfiguration: `""`, + WhiteBalance: `0`, + Sharpness: `0`, + FNumber: `"270/100"`, + ColorSpace: `1`, + FileSource: `""`, + PixelXDimension: `1280`, + SensingMethod: `2`, + GainControl: `2`, + Saturation: `0`, + SubjectDistanceRange: `0`, + DateTimeDigitized: `"2007:01:01 12:00:00"`, + MeteringMode: `5`, + MakerNote: `""`, + Model: `"KODAK EASYSHARE C713 ZOOM DIGITAL CAMERA"`, + ExposureBiasValue: `"0/10"`, + PixelYDimension: `960`, + ExifVersion: `"0221"`, + Flash: `25`, + CustomRendered: `0`, + DigitalZoomRatio: `"0/10"`, + Orientation: `1`, + XResolution: `"480/1"`, + ISOSpeedRatings: `200`, + }, + "2007-01-17-21-49-44-sep-2007-01-17-21-49-44a.jpg": map[FieldName]string{ + XResolution: `"180/1"`, + ISOSpeedRatings: `50`, + ExifVersion: `"0220"`, + Flash: `24`, + CustomRendered: `0`, + Orientation: `1`, + ThumbJPEGInterchangeFormatLength: `7024`, + ExposureProgram: `2`, + MaxApertureValue: `"297/100"`, + ThumbJPEGInterchangeFormat: `956`, + YCbCrPositioning: `2`, + ExifIFDPointer: `266`, + ExposureTime: `"1/30"`, + InteroperabilityIndex: `"R98"`, + ResolutionUnit: `2`, + Software: `"1.00.018PR "`, + DateTime: `"2007:01:17 21:49:44"`, + ShutterSpeedValue: `"491/100"`, + ApertureValue: `"33/10"`, + LightSource: `0`, + FocalLength: `"73/10"`, + FlashpixVersion: `"0100"`, + YResolution: `"180/1"`, + DateTimeOriginal: `"2007:01:17 21:49:44"`, + ComponentsConfiguration: `""`, + InteroperabilityIFDPointer: `832`, + ExposureMode: `0`, + SceneCaptureType: `0`, + Make: `"Digital Camera "`, + ColorSpace: `1`, + FileSource: `""`, + WhiteBalance: `0`, + FNumber: `"33/10"`, + MeteringMode: `2`, + MakerNote: `"6106789012345678901234567890123456789012345678901234567890123456789012345678901234567890123456789012345678901234567890123456"`, + PixelXDimension: `2816`, + SensingMethod: `2`, + DateTimeDigitized: `"2007:01:17 21:49:44"`, + Model: `"6MP-9Y8 "`, + ExposureBiasValue: `"0/10"`, + PixelYDimension: `2112`, + ImageDescription: `"Digital image "`, + }, + "2007-02-02-18-13-29-sep-2007-02-02-18-13-29a.jpg": map[FieldName]string{ + Software: `"Optio S5z Ver 1.00 "`, + FNumber: `"26/10"`, + Sharpness: `0`, + Orientation: `1`, + ResolutionUnit: `2`, + YCbCrPositioning: `1`, + ExifIFDPointer: `586`, + ExposureTime: `"1/60"`, + ComponentsConfiguration: `""`, + MeteringMode: `5`, + SubjectDistanceRange: `2`, + YResolution: `"72/1"`, + ThumbJPEGInterchangeFormatLength: `8800`, + ExposureBiasValue: `"0/3"`, + FlashpixVersion: `"0100"`, + PixelYDimension: `1920`, + WhiteBalance: `0`, + Make: `"PENTAX Corporation "`, + DateTimeDigitized: `"2007:02:02 18:13:29"`, + PixelXDimension: `2560`, + InteroperabilityIFDPointer: `30974`, + CustomRendered: `0`, + ExposureMode: `0`, + InteroperabilityIndex: `"R98"`, + DateTime: `"2007:02:02 18:13:29"`, + ExposureProgram: `2`, + XResolution: `"72/1"`, + ISOSpeedRatings: `200`, + ExifVersion: `"0220"`, + CompressedBitsPerPixel: `"27033600/4915200"`, + Flash: `25`, + FocalLengthIn35mmFilm: `35`, + Saturation: `0`, + Model: `"PENTAX Optio S5z "`, + ThumbJPEGInterchangeFormat: `31098`, + MaxApertureValue: `"28/10"`, + FocalLength: `"580/100"`, + ColorSpace: `1`, + DateTimeOriginal: `"2007:02:02 18:13:29"`, + MakerNote: `""`, + DigitalZoomRatio: `"0/0"`, + SceneCaptureType: `0`, + Contrast: `0`, + }, + "2007-05-02-17-02-21-sep-2007-05-02-17-02-21a.jpg": map[FieldName]string{ + UserComment: `""`, + PixelXDimension: `1600`, + SensingMethod: `2`, + DateTimeDigitized: `"2007:05:02 17:02:21"`, + CompressedBitsPerPixel: `"3/1"`, + MeteringMode: `5`, + MakerNote: `""`, + Model: `"Canon IXY DIGITAL 55"`, + ExposureBiasValue: `"0/3"`, + PixelYDimension: `1200`, + FocalPlaneResolutionUnit: `2`, + FocalPlaneYResolution: `"1200000/168"`, + CustomRendered: `0`, + DigitalZoomRatio: `"2592/2592"`, + Orientation: `1`, + XResolution: `"180/1"`, + ExifVersion: `"0220"`, + Flash: `9`, + ThumbJPEGInterchangeFormat: `5108`, + ThumbJPEGInterchangeFormatLength: `6306`, + MaxApertureValue: `"107/32"`, + InteroperabilityIndex: `"R98"`, + ResolutionUnit: `2`, + YCbCrPositioning: `1`, + ExifIFDPointer: `196`, + ExposureTime: `"1/60"`, + FocalLength: `"7109/1000"`, + FlashpixVersion: `"0100"`, + FocalPlaneXResolution: `"1600000/225"`, + YResolution: `"180/1"`, + DateTime: `"2007:05:02 17:02:21"`, + ShutterSpeedValue: `"189/32"`, + ApertureValue: `"107/32"`, + ExposureMode: `0`, + SceneCaptureType: `0`, + Make: `"Canon"`, + DateTimeOriginal: `"2007:05:02 17:02:21"`, + ComponentsConfiguration: `""`, + InteroperabilityIFDPointer: `2226`, + FNumber: `"32/10"`, + ColorSpace: `1`, + FileSource: `""`, + WhiteBalance: `0`, + }, + "2007-05-12-08-19-07-sep-2007-05-12-08-19-07a.jpg": map[FieldName]string{ + Model: `"EX-Z70 "`, + ExposureBiasValue: `"0/3"`, + PixelYDimension: `480`, + CustomRendered: `0`, + DigitalZoomRatio: `"0/0"`, + Orientation: `1`, + XResolution: `"72/1"`, + ExifVersion: `"0221"`, + Flash: `16`, + ThumbJPEGInterchangeFormat: `27422`, + ThumbJPEGInterchangeFormatLength: `8332`, + ExposureProgram: `2`, + MaxApertureValue: `"33/10"`, + InteroperabilityIndex: `"R98"`, + ResolutionUnit: `2`, + YCbCrPositioning: `1`, + ExifIFDPointer: `282`, + ExposureTime: `"1/50"`, + FocalLength: `"630/100"`, + FlashpixVersion: `"0100"`, + YResolution: `"72/1"`, + Software: `"1.00 "`, + DateTime: `"2007:06:17 22:56:38"`, + LightSource: `0`, + ExposureMode: `0`, + FocalLengthIn35mmFilm: `38`, + SceneCaptureType: `0`, + Contrast: `0`, + Make: `"CASIO COMPUTER CO.,LTD."`, + DateTimeOriginal: `"2007:05:12 08:19:07"`, + ComponentsConfiguration: `""`, + InteroperabilityIFDPointer: `27298`, + Sharpness: `0`, + FNumber: `"31/10"`, + ColorSpace: `1`, + FileSource: `""`, + WhiteBalance: `0`, + PixelXDimension: `640`, + GainControl: `2`, + Saturation: `0`, + DateTimeDigitized: `"2007:06:17 22:56:38"`, + CompressedBitsPerPixel: `"252746/307200"`, + MeteringMode: `5`, + MakerNote: `""`, + }, + "2007-05-26-04-49-45-sep-2007-05-26-04-49-45a.jpg": map[FieldName]string{ + ThumbJPEGInterchangeFormat: `4596`, + ThumbJPEGInterchangeFormatLength: `10120`, + ExposureProgram: `2`, + MaxApertureValue: `"34/10"`, + ResolutionUnit: `2`, + YCbCrPositioning: `2`, + ExifIFDPointer: `284`, + ExposureTime: `"10/3486"`, + SceneType: `""`, + InteroperabilityIndex: `"R98"`, + YResolution: `"300/1"`, + Software: `"COOLPIX L3v1.2"`, + DateTime: `"2007:05:26 04:49:45"`, + LightSource: `0`, + FocalLength: `"63/10"`, + FlashpixVersion: `"0100"`, + Contrast: `0`, + Make: `"NIKON"`, + DateTimeOriginal: `"2007:05:26 04:49:45"`, + ComponentsConfiguration: `""`, + InteroperabilityIFDPointer: `1026`, + ExposureMode: `0`, + FocalLengthIn35mmFilm: `38`, + SceneCaptureType: `2`, + FNumber: `"32/10"`, + ColorSpace: `1`, + FileSource: `""`, + WhiteBalance: `0`, + Sharpness: `0`, + Saturation: `0`, + DateTimeDigitized: `"2007:05:26 04:49:45"`, + CompressedBitsPerPixel: `"4/1"`, + MeteringMode: `5`, + MakerNote: `""`, + UserComment: `" "`, + PixelXDimension: `2592`, + GainControl: `0`, + SubjectDistanceRange: `0`, + ImageDescription: `" "`, + Model: `"COOLPIX L3"`, + ExposureBiasValue: `"0/10"`, + PixelYDimension: `1944`, + Orientation: `1`, + XResolution: `"300/1"`, + ISOSpeedRatings: `50`, + ExifVersion: `"0220"`, + Flash: `24`, + CustomRendered: `0`, + DigitalZoomRatio: `"0/100"`, + }, + "2007-05-30-14-28-01-sep-2007-05-30-14-28-01a.jpg": map[FieldName]string{ + CompressedBitsPerPixel: `"2/1"`, + MeteringMode: `5`, + UserComment: `" "`, + GainControl: `1`, + Saturation: `0`, + SubjectDistanceRange: `0`, + ExifIFDPointer: `284`, + ExposureTime: `"10/40"`, + InteroperabilityIndex: `"R98"`, + Software: `"COOLPIX S6V1.0"`, + ImageDescription: `" "`, + Model: `"COOLPIX S6"`, + XResolution: `"300/1"`, + ISOSpeedRatings: `53`, + ComponentsConfiguration: `""`, + InteroperabilityIFDPointer: `1026`, + 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GPSLatitude: `["40/1","46/1","1322/100"]`, + InteroperabilityIndex: `"R98"`, + Make: `"HTC"`, + DateTimeOriginal: `"2012:12:19 21:38:40"`, + DateTimeDigitized: `"2012:12:19 21:38:40"`, + PixelXDimension: `3264`, + GPSLatitudeRef: `"N"`, + GPSLongitude: `["111/1","53/1","2840/100"]`, + GPSLongitudeRef: `"W"`, + GPSProcessingMethod: `"ASCIIGPS"`, + ResolutionUnit: `2`, + YCbCrPositioning: `1`, + GPSInfoIFDPointer: `352`, + ExifVersion: `"0220"`, + GPSMapDatum: `"WGS-84"`, + YResolution: `"72/1"`, + ThumbJPEGInterchangeFormat: `696`, + FlashpixVersion: `"0100"`, + GPSAltitudeRef: `0`, + GPSVersionID: `[2,2,0]`, + GPSAltitude: `"1334/1"`, + GPSTimeStamp: `["4/1","38/1","40/1"]`, + XResolution: `"72/1"`, + ExifIFDPointer: `136`, + ISOSpeedRatings: `801`, + ComponentsConfiguration: `""`, + PixelYDimension: `1952`, + GPSDateStamp: `"2012:12:20"`, + Model: `"ADR6400L"`, + ThumbJPEGInterchangeFormatLength: `38469`, + FocalLength: `"457/100"`, + ColorSpace: `1`, + }, + "2012-12-21-11-15-19-sep-IMG_0001.jpg": map[FieldName]string{ + ResolutionUnit: `2`, + YCbCrPositioning: `2`, + ExifIFDPointer: `360`, + ExposureTime: `"1/30"`, + InteroperabilityIndex: `"R98"`, + SubSecTimeDigitized: `"00"`, + FlashpixVersion: `"0100"`, + FocalPlaneXResolution: `"5184000/894"`, + YResolution: `"72/1"`, + DateTime: `"2012:12:21 11:15:19"`, + ShutterSpeedValue: `"327680/65536"`, + ApertureValue: `"286720/65536"`, + FocalLength: `"24/1"`, + LensModel: `"EF-S18-55mm f/3.5-5.6 IS II"`, + GPSVersionID: `[2,3,0,0]`, + InteroperabilityIFDPointer: `8806`, + ExposureMode: `0`, + SceneCaptureType: `0`, + Make: `"Canon"`, + GPSInfoIFDPointer: `9034`, + DateTimeOriginal: `"2012:12:21 11:15:19"`, + ComponentsConfiguration: `""`, + SubSecTime: `"00"`, + Artist: `""`, + FNumber: `"45/10"`, + ColorSpace: `1`, + WhiteBalance: `0`, + DateTimeDigitized: `"2012:12:21 11:15:19"`, + MeteringMode: `5`, + MakerNote: `""`, + UserComment: `""`, + PixelXDimension: `5184`, + FocalPlaneResolutionUnit: `2`, + Model: `"Canon EOS REBEL T4i"`, + Copyright: `""`, + ExposureBiasValue: `"0/1"`, + SubSecTimeOriginal: `"00"`, + PixelYDimension: `3456`, + FocalPlaneYResolution: `"3456000/597"`, + CustomRendered: `0`, + Orientation: `1`, + XResolution: `"72/1"`, + ISOSpeedRatings: `1600`, + ExifVersion: `"0230"`, + Flash: `16`, + ThumbJPEGInterchangeFormat: `10924`, + ThumbJPEGInterchangeFormatLength: `14327`, + ExposureProgram: `0`, + }, + "2013-02-05-23-12-09-sep-DSCI0001.jpg": map[FieldName]string{ + ApertureValue: `"3072/1000"`, + ExposureBiasValue: `"0/10"`, + FlashpixVersion: `"0100"`, + PixelYDimension: `1200`, + FileSource: `""`, + YResolution: `"288/3"`, + ThumbJPEGInterchangeFormatLength: `5863`, + ShutterSpeedValue: `"5907/1000"`, + WhiteBalance: `0`, + InteroperabilityIFDPointer: `4838`, + ExposureMode: `0`, + InteroperabilityIndex: `"R98"`, + Make: `"Polaroid"`, + DateTimeDigitized: `"2013:02:05 23:12:09"`, + PixelXDimension: `1600`, + DateTime: `"2013:02:05 23:12:09"`, + ExposureProgram: `2`, + CompressedBitsPerPixel: `"3766184/1920000"`, + Flash: `1`, + FocalLengthIn35mmFilm: `35`, + XResolution: `"288/3"`, + ISOSpeedRatings: `100`, + ExifVersion: `"0210"`, + MaxApertureValue: `"3072/1000"`, + LightSource: `0`, + FocalLength: `"5954/1000"`, + ColorSpace: `1`, + Model: `"Polaroid i532"`, + Copyright: `"Copyright 2005"`, + ThumbJPEGInterchangeFormat: `4974`, + SceneType: `""`, + DigitalZoomRatio: `"100/100"`, + SceneCaptureType: `0`, + DateTimeOriginal: `"2013:02:05 23:12:09"`, + MakerNote: `" BARCODE:A265KS008000; ZP:812; FP:124; AWB:235,679; PWB:476,304; PMF:12,11610; LV:493; LUM:3-8-9-8-1-11;20;26;19;10;A:1,F1:6,F2:18;ET:145, W:2, F:3 ;FV: 41FV: 36FV: 43FV: 223FV: 258FV: 9FV: 466FV: 216FP: 10FP: 8FP: 6FP: 6FP: 6FP: 0FP: 8FP: 8AFS: 110"`, + SensingMethod: `2`, + Sharpness: `0`, + ImageDescription: `""`, + Software: `" 1.0"`, + FNumber: `"28/10"`, + ExifIFDPointer: `240`, + ExposureTime: `"1/60"`, + ComponentsConfiguration: `""`, + MeteringMode: `3`, + Orientation: `1`, + ResolutionUnit: `2`, + YCbCrPositioning: `2`, + }, + "2099-08-12-19-59-29-sep-2099-08-12-19-59-29a.jpg": map[FieldName]string{ + Model: `"NIKON D70s"`, + ExposureBiasValue: `"0/6"`, + SubSecTimeOriginal: `"00"`, + PixelYDimension: `2000`, + CFAPattern: `""`, + CustomRendered: `0`, + DigitalZoomRatio: `"1/1"`, + Orientation: `1`, + XResolution: `"300/1"`, + ExifVersion: `"0221"`, + Flash: `31`, + ThumbJPEGInterchangeFormat: `28588`, + ThumbJPEGInterchangeFormatLength: `8886`, + ExposureProgram: `0`, + MaxApertureValue: `"36/10"`, + SceneType: `""`, + InteroperabilityIndex: `"R98"`, + ResolutionUnit: `2`, + YCbCrPositioning: `2`, + ExifIFDPointer: `216`, + ExposureTime: `"10/600"`, + FocalLength: `"180/10"`, + SubSecTimeDigitized: `"00"`, + FlashpixVersion: `"0100"`, + YResolution: `"300/1"`, + Software: `"Ver.1.00 "`, + DateTime: `"2099:08:12 19:59:29"`, + LightSource: `0`, + InteroperabilityIFDPointer: `28448`, + ExposureMode: `0`, + FocalLengthIn35mmFilm: `27`, + SceneCaptureType: `0`, + Make: `"NIKON CORPORATION"`, + DateTimeOriginal: `"2099:08:12 19:59:29"`, + ComponentsConfiguration: `""`, + SubSecTime: `"00"`, + Contrast: `1`, + Sharpness: `0`, + FNumber: `"35/10"`, + ColorSpace: `1`, + FileSource: `""`, + WhiteBalance: `0`, + UserComment: `"ASCII "`, + PixelXDimension: `3008`, + SensingMethod: `2`, + GainControl: `0`, + DateTimeDigitized: `"2099:08:12 19:59:29"`, + CompressedBitsPerPixel: `"2/1"`, + MeteringMode: `5`, + MakerNote: `""`, + Saturation: `0`, + SubjectDistanceRange: `0`, + }, + "2216-11-15-11-46-51-sep-2216-11-15-11-46-51a.jpg": map[FieldName]string{ + ExposureProgram: `2`, + FileSource: `""`, + FNumber: `"480/100"`, + YCbCrPositioning: `2`, + DateTimeDigitized: `"2216:11:15 11:46:51"`, + MakerNote: `""`, + PixelXDimension: `3296`, + SensingMethod: `2`, + SceneType: `""`, + ResolutionUnit: `2`, + ApertureValue: `"452/100"`, + ExposureBiasValue: `"0/10"`, + LightSource: `0`, + FocalLength: `"60/10"`, + FlashpixVersion: `"0100"`, + PixelYDimension: `2472`, + YResolution: `"480/1"`, + DateTimeOriginal: `"2216:11:15 11:46:51"`, + Flash: `24`, + ExposureMode: `0`, + ExifVersion: `"0221"`, + ThumbJPEGInterchangeFormatLength: `5175`, + MaxApertureValue: `"286/100"`, + ColorSpace: `1`, + ExposureIndex: `"80/1"`, + WhiteBalance: `0`, + Sharpness: `0`, + ThumbJPEGInterchangeFormat: `17818`, + ExposureTime: `"1016/1000000"`, + MeteringMode: `5`, + GainControl: `0`, + Saturation: `0`, + SubjectDistanceRange: `0`, + ExifIFDPointer: `2316`, + Software: `"KODAK EASYSHARE C813 ZOOM DIGITAL CAMERA"`, + ShutterSpeedValue: `"994/100"`, + Model: `"KODAK EASYSHARE C813 ZOOM DIGITAL CAMERA"`, + Orientation: `1`, + XResolution: `"480/1"`, + ISOSpeedRatings: `80`, + ComponentsConfiguration: `""`, + InteroperabilityIFDPointer: `17674`, + CustomRendered: `0`, + DigitalZoomRatio: `"0/10"`, + Make: `"EASTMAN KODAK COMPANY"`, + SceneCaptureType: `0`, + Contrast: `0`, + FocalLengthIn35mmFilm: `36`, + }, + "FailedHash-NoDate-sep-remembory.jpg": map[FieldName]string{ + Model: `"MFC-7840W"`, + YResolution: `"150/1"`, + Software: `"Apple Image Capture"`, + PixelYDimension: `1626`, + ExifIFDPointer: `192`, + PixelXDimension: `1232`, + Make: `"Brother"`, + Orientation: `1`, + XResolution: `"150/1"`, + ResolutionUnit: `2`, + }, + "f1-exif.jpg": map[FieldName]string{ + PixelXDimension: `0`, + Orientation: `1`, + XResolution: `"72/1"`, + ResolutionUnit: `2`, + YCbCrPositioning: `1`, + ExifIFDPointer: `134`, + ExifVersion: `"0210"`, + ComponentsConfiguration: `""`, + YResolution: `"72/1"`, + DateTime: `"2012:11:04 05:42:02"`, + FlashpixVersion: `"0100"`, + ColorSpace: `65535`, + PixelYDimension: `0`, + }, + "f2-exif.jpg": map[FieldName]string{ + FlashpixVersion: `"0100"`, + ColorSpace: `65535`, + PixelYDimension: `0`, + YResolution: `"72/1"`, + DateTime: `"2012:11:04 05:42:32"`, + ResolutionUnit: `2`, + YCbCrPositioning: `1`, + ExifIFDPointer: `134`, + ExifVersion: `"0210"`, + ComponentsConfiguration: `""`, + PixelXDimension: `0`, + Orientation: `2`, + XResolution: `"72/1"`, + }, + "f3-exif.jpg": map[FieldName]string{ + FlashpixVersion: `"0100"`, + ColorSpace: `65535`, + PixelYDimension: `0`, + YResolution: `"72/1"`, + DateTime: `"2012:11:04 05:42:32"`, + ResolutionUnit: `2`, + YCbCrPositioning: `1`, + ExifIFDPointer: `134`, + ExifVersion: `"0210"`, + ComponentsConfiguration: `""`, + PixelXDimension: `0`, + Orientation: `3`, + XResolution: `"72/1"`, + }, + "f4-exif.jpg": map[FieldName]string{ + ExifVersion: `"0210"`, + ComponentsConfiguration: `""`, + PixelXDimension: `0`, + Orientation: `4`, + XResolution: `"72/1"`, + ResolutionUnit: `2`, + YCbCrPositioning: `1`, + ExifIFDPointer: `134`, + YResolution: `"72/1"`, + DateTime: `"2012:11:04 05:42:32"`, + FlashpixVersion: `"0100"`, + ColorSpace: `65535`, + PixelYDimension: `0`, + }, + "f5-exif.jpg": map[FieldName]string{ + ExifIFDPointer: `134`, + ExifVersion: `"0210"`, + ComponentsConfiguration: `""`, + PixelXDimension: `0`, + Orientation: `5`, + XResolution: `"72/1"`, + ResolutionUnit: `2`, + YCbCrPositioning: `1`, + PixelYDimension: `0`, + YResolution: `"72/1"`, + DateTime: `"2012:11:04 05:42:32"`, + FlashpixVersion: `"0100"`, + ColorSpace: `65535`, + }, + "f6-exif.jpg": map[FieldName]string{ + YResolution: `"72/1"`, + DateTime: `"2012:11:04 05:42:32"`, + FlashpixVersion: `"0100"`, + ColorSpace: `65535`, + PixelYDimension: `0`, + ExifVersion: `"0210"`, + ComponentsConfiguration: `""`, + PixelXDimension: `0`, + Orientation: `6`, + XResolution: `"72/1"`, + ResolutionUnit: `2`, + YCbCrPositioning: `1`, + ExifIFDPointer: `134`, + }, + "f7-exif.jpg": map[FieldName]string{ + ExifIFDPointer: `134`, + ExifVersion: `"0210"`, + ComponentsConfiguration: `""`, + PixelXDimension: `0`, + Orientation: `7`, + XResolution: `"72/1"`, + ResolutionUnit: `2`, + YCbCrPositioning: `1`, + PixelYDimension: `0`, + YResolution: `"72/1"`, + DateTime: `"2012:11:04 05:42:32"`, + FlashpixVersion: `"0100"`, + ColorSpace: `65535`, + }, + "f8-exif.jpg": map[FieldName]string{ + ResolutionUnit: `2`, + YCbCrPositioning: `1`, + ExifIFDPointer: `134`, + ExifVersion: `"0210"`, + ComponentsConfiguration: `""`, + PixelXDimension: `0`, + Orientation: `8`, + XResolution: `"72/1"`, + FlashpixVersion: `"0100"`, + ColorSpace: `65535`, + PixelYDimension: `0`, + YResolution: `"72/1"`, + DateTime: `"2012:11:04 05:42:32"`, + }, + "geodegrees_as_string.jpg": map[FieldName]string{ + GPSAltitudeRef: `0`, + ThumbJPEGInterchangeFormat: `539`, + ThumbJPEGInterchangeFormatLength: `13132`, + WhiteBalance: `0`, + ExposureProgram: `0`, + Sharpness: `2`, + ExifIFDPointer: `114`, + ExposureTime: `"0/1024"`, + Saturation: `0`, + GPSLatitude: `"52,00000,50,00000,34,01180"`, + GPSTimeStamp: `"17,00000,8,00000,29,00000"`, + Model: `"HTC One_M8"`, + ApertureValue: `"2048/1024"`, + FocalLength: `"3072/1024"`, + GPSLatitudeRef: `"N"`, + GPSLongitude: `"11,00000,10,00000,58,28360"`, + GPSAltitude: `"0/1024"`, + GPSLongitudeRef: `"E"`, + GPSProcessingMethod: `"ASCII"`, + GPSInfoIFDPointer: `317`, + Make: `"HTC"`, + DateTimeOriginal: `"2014:04:26 19:09:19"`, + ISOSpeedRatings: `125`, + Contrast: `0`, + }, + "has-lens-info.jpg": map[FieldName]string{ + LensModel: `"iPhone 4S back camera 4.28mm f/2.4"`, + Model: `"iPhone 4S"`, + ThumbJPEGInterchangeFormatLength: `10875`, + ShutterSpeedValue: `"106906/10353"`, + FocalLength: `"107/25"`, + SubjectArea: `[1631,1223,881,881]`, + ColorSpace: `1`, + PixelYDimension: `2448`, + GPSLatitude: `["59/1","19/1","5717/100"]`, + Make: `"Apple"`, + DateTimeOriginal: `"2014:09:01 15:03:47"`, + DateTimeDigitized: `"2014:09:01 15:03:47"`, + BrightnessValue: `"3927/419"`, + PixelXDimension: `3264`, + SceneType: `""`, + LensMake: `"Apple"`, + GPSLatitudeRef: `"N"`, + GPSLongitude: `["18/1","3/1","5379/100"]`, + FocalLengthIn35mmFilm: `35`, + Orientation: `6`, + ResolutionUnit: `2`, + YCbCrPositioning: `1`, + GPSInfoIFDPointer: `948`, + ExifVersion: `"0221"`, + MeteringMode: `5`, + Flash: `16`, + GPSLongitudeRef: `"E"`, + YResolution: `"72/1"`, + ThumbJPEGInterchangeFormat: `1244`, + ApertureValue: `"4845/1918"`, + SubSecTimeDigitized: `"880"`, + FlashpixVersion: `"0100"`, + WhiteBalance: `0`, + GPSAltitudeRef: `0`, + MakerNote: `""`, + SensingMethod: `2`, + ExposureMode: `0`, + SceneCaptureType: `0`, + GPSImgDirection: `"18329/175"`, + Software: `"7.1.1"`, + DateTime: `"2014:09:01 15:03:47"`, + FNumber: `"12/5"`, + ExposureProgram: `2`, + SubSecTimeOriginal: `"880"`, + GPSImgDirectionRef: `"T"`, + XResolution: `"72/1"`, + ExifIFDPointer: `204`, + ExposureTime: `"1/1284"`, + ISOSpeedRatings: `50`, + ComponentsConfiguration: `""`, + GPSAltitude: `"29/1"`, + GPSTimeStamp: `["13/1","3/1","4279/100"]`, + }, +} diff --git a/Godeps/_workspace/src/github.com/rwcarlsen/goexif/tiff/tag.go b/Godeps/_workspace/src/github.com/rwcarlsen/goexif/tiff/tag.go new file mode 100644 index 000000000..66b68e334 --- /dev/null +++ b/Godeps/_workspace/src/github.com/rwcarlsen/goexif/tiff/tag.go @@ -0,0 +1,438 @@ +package tiff + +import ( + "bytes" + "encoding/binary" + "errors" + "fmt" + "io" + "math/big" + "strings" + "unicode" + "unicode/utf8" +) + +// Format specifies the Go type equivalent used to represent the basic +// tiff data types. +type Format int + +const ( + IntVal Format = iota + FloatVal + RatVal + StringVal + UndefVal + OtherVal +) + +var ErrShortReadTagValue = errors.New("tiff: short read of tag value") + +var formatNames = map[Format]string{ + IntVal: "int", + FloatVal: "float", + RatVal: "rational", + StringVal: "string", + UndefVal: "undefined", + OtherVal: "other", +} + +// DataType represents the basic tiff tag data types. +type DataType uint16 + +const ( + DTByte DataType = 1 + DTAscii = 2 + DTShort = 3 + DTLong = 4 + DTRational = 5 + DTSByte = 6 + DTUndefined = 7 + DTSShort = 8 + DTSLong = 9 + DTSRational = 10 + DTFloat = 11 + DTDouble = 12 +) + +var typeNames = map[DataType]string{ + DTByte: "byte", + DTAscii: "ascii", + DTShort: "short", + DTLong: "long", + DTRational: "rational", + DTSByte: "signed byte", + DTUndefined: "undefined", + DTSShort: "signed short", + DTSLong: "signed long", + DTSRational: "signed rational", + DTFloat: "float", + DTDouble: "double", +} + +// typeSize specifies the size in bytes of each type. +var typeSize = map[DataType]uint32{ + DTByte: 1, + DTAscii: 1, + DTShort: 2, + DTLong: 4, + DTRational: 8, + DTSByte: 1, + DTUndefined: 1, + DTSShort: 2, + DTSLong: 4, + DTSRational: 8, + DTFloat: 4, + DTDouble: 8, +} + +// Tag reflects the parsed content of a tiff IFD tag. +type Tag struct { + // Id is the 2-byte tiff tag identifier. + Id uint16 + // Type is an integer (1 through 12) indicating the tag value's data type. + Type DataType + // Count is the number of type Type stored in the tag's value (i.e. the + // tag's value is an array of type Type and length Count). + Count uint32 + // Val holds the bytes that represent the tag's value. + Val []byte + // ValOffset holds byte offset of the tag value w.r.t. the beginning of the + // reader it was decoded from. Zero if the tag value fit inside the offset + // field. + ValOffset uint32 + + order binary.ByteOrder + intVals []int64 + floatVals []float64 + ratVals [][]int64 + strVal string + format Format +} + +// DecodeTag parses a tiff-encoded IFD tag from r and returns a Tag object. The +// first read from r should be the first byte of the tag. ReadAt offsets should +// generally be relative to the beginning of the tiff structure (not relative +// to the beginning of the tag). +func DecodeTag(r ReadAtReader, order binary.ByteOrder) (*Tag, error) { + t := new(Tag) + t.order = order + + err := binary.Read(r, order, &t.Id) + if err != nil { + return nil, errors.New("tiff: tag id read failed: " + err.Error()) + } + + err = binary.Read(r, order, &t.Type) + if err != nil { + return nil, errors.New("tiff: tag type read failed: " + err.Error()) + } + + err = binary.Read(r, order, &t.Count) + if err != nil { + return nil, errors.New("tiff: tag component count read failed: " + err.Error()) + } + + // There seems to be a relatively common corrupt tag which has a Count of + // MaxUint32. This is probably not a valid value, so return early. + if t.Count == 1<<32-1 { + return t, errors.New("invalid Count offset in tag") + } + + valLen := typeSize[t.Type] * t.Count + if valLen == 0 { + return t, errors.New("zero length tag value") + } + + if valLen > 4 { + binary.Read(r, order, &t.ValOffset) + + // Use a bytes.Buffer so we don't allocate a huge slice if the tag + // is corrupt. + var buff bytes.Buffer + sr := io.NewSectionReader(r, int64(t.ValOffset), int64(valLen)) + n, err := io.Copy(&buff, sr) + if err != nil { + return t, errors.New("tiff: tag value read failed: " + err.Error()) + } else if n != int64(valLen) { + return t, ErrShortReadTagValue + } + t.Val = buff.Bytes() + + } else { + val := make([]byte, valLen) + if _, err = io.ReadFull(r, val); err != nil { + return t, errors.New("tiff: tag offset read failed: " + err.Error()) + } + // ignore padding. + if _, err = io.ReadFull(r, make([]byte, 4-valLen)); err != nil { + return t, errors.New("tiff: tag offset read failed: " + err.Error()) + } + + t.Val = val + } + + return t, t.convertVals() +} + +func (t *Tag) convertVals() error { + r := bytes.NewReader(t.Val) + + switch t.Type { + case DTAscii: + if len(t.Val) > 0 { + t.strVal = string(t.Val[:len(t.Val)-1]) // ignore the last byte (NULL). + } + case DTByte: + var v uint8 + t.intVals = make([]int64, int(t.Count)) + for i := range t.intVals { + err := binary.Read(r, t.order, &v) + if err != nil { + return err + } + t.intVals[i] = int64(v) + } + case DTShort: + var v uint16 + t.intVals = make([]int64, int(t.Count)) + for i := range t.intVals { + err := binary.Read(r, t.order, &v) + if err != nil { + return err + } + t.intVals[i] = int64(v) + } + case DTLong: + var v uint32 + t.intVals = make([]int64, int(t.Count)) + for i := range t.intVals { + err := binary.Read(r, t.order, &v) + if err != nil { + return err + } + t.intVals[i] = int64(v) + } + case DTSByte: + var v int8 + t.intVals = make([]int64, int(t.Count)) + for i := range t.intVals { + err := binary.Read(r, t.order, &v) + if err != nil { + return err + } + t.intVals[i] = int64(v) + } + case DTSShort: + var v int16 + t.intVals = make([]int64, int(t.Count)) + for i := range t.intVals { + err := binary.Read(r, t.order, &v) + if err != nil { + return err + } + t.intVals[i] = int64(v) + } + case DTSLong: + var v int32 + t.intVals = make([]int64, int(t.Count)) + for i := range t.intVals { + err := binary.Read(r, t.order, &v) + if err != nil { + return err + } + t.intVals[i] = int64(v) + } + case DTRational: + t.ratVals = make([][]int64, int(t.Count)) + for i := range t.ratVals { + var n, d uint32 + err := binary.Read(r, t.order, &n) + if err != nil { + return err + } + err = binary.Read(r, t.order, &d) + if err != nil { + return err + } + t.ratVals[i] = []int64{int64(n), int64(d)} + } + case DTSRational: + t.ratVals = make([][]int64, int(t.Count)) + for i := range t.ratVals { + var n, d int32 + err := binary.Read(r, t.order, &n) + if err != nil { + return err + } + err = binary.Read(r, t.order, &d) + if err != nil { + return err + } + t.ratVals[i] = []int64{int64(n), int64(d)} + } + case DTFloat: // float32 + t.floatVals = make([]float64, int(t.Count)) + for i := range t.floatVals { + var v float32 + err := binary.Read(r, t.order, &v) + if err != nil { + return err + } + t.floatVals[i] = float64(v) + } + case DTDouble: + t.floatVals = make([]float64, int(t.Count)) + for i := range t.floatVals { + var u float64 + err := binary.Read(r, t.order, &u) + if err != nil { + return err + } + t.floatVals[i] = u + } + } + + switch t.Type { + case DTByte, DTShort, DTLong, DTSByte, DTSShort, DTSLong: + t.format = IntVal + case DTRational, DTSRational: + t.format = RatVal + case DTFloat, DTDouble: + t.format = FloatVal + case DTAscii: + t.format = StringVal + case DTUndefined: + t.format = UndefVal + default: + t.format = OtherVal + } + + return nil +} + +// Format returns a value indicating which method can be called to retrieve the +// tag's value properly typed (e.g. integer, rational, etc.). +func (t *Tag) Format() Format { return t.format } + +func (t *Tag) typeErr(to Format) error { + return &wrongFmtErr{typeNames[t.Type], formatNames[to]} +} + +// Rat returns the tag's i'th value as a rational number. It returns a nil and +// an error if this tag's Format is not RatVal. It panics for zero deminators +// or if i is out of range. +func (t *Tag) Rat(i int) (*big.Rat, error) { + n, d, err := t.Rat2(i) + if err != nil { + return nil, err + } + return big.NewRat(n, d), nil +} + +// Rat2 returns the tag's i'th value as a rational number represented by a +// numerator-denominator pair. It returns an error if the tag's Format is not +// RatVal. It panics if i is out of range. +func (t *Tag) Rat2(i int) (num, den int64, err error) { + if t.format != RatVal { + return 0, 0, t.typeErr(RatVal) + } + return t.ratVals[i][0], t.ratVals[i][1], nil +} + +// Int64 returns the tag's i'th value as an integer. It returns an error if the +// tag's Format is not IntVal. It panics if i is out of range. +func (t *Tag) Int64(i int) (int64, error) { + if t.format != IntVal { + return 0, t.typeErr(IntVal) + } + return t.intVals[i], nil +} + +// Int returns the tag's i'th value as an integer. It returns an error if the +// tag's Format is not IntVal. It panics if i is out of range. +func (t *Tag) Int(i int) (int, error) { + if t.format != IntVal { + return 0, t.typeErr(IntVal) + } + return int(t.intVals[i]), nil +} + +// Float returns the tag's i'th value as a float. It returns an error if the +// tag's Format is not IntVal. It panics if i is out of range. +func (t *Tag) Float(i int) (float64, error) { + if t.format != FloatVal { + return 0, t.typeErr(FloatVal) + } + return t.floatVals[i], nil +} + +// StringVal returns the tag's value as a string. It returns an error if the +// tag's Format is not StringVal. It panics if i is out of range. +func (t *Tag) StringVal() (string, error) { + if t.format != StringVal { + return "", t.typeErr(StringVal) + } + return t.strVal, nil +} + +// String returns a nicely formatted version of the tag. +func (t *Tag) String() string { + data, err := t.MarshalJSON() + if err != nil { + return "ERROR: " + err.Error() + } + + if t.Count == 1 { + return strings.Trim(fmt.Sprintf("%s", data), "[]") + } + return fmt.Sprintf("%s", data) +} + +func (t *Tag) MarshalJSON() ([]byte, error) { + switch t.format { + case StringVal, UndefVal: + return nullString(t.Val), nil + case OtherVal: + return []byte(fmt.Sprintf("unknown tag type '%v'", t.Type)), nil + } + + rv := []string{} + for i := 0; i < int(t.Count); i++ { + switch t.format { + case RatVal: + n, d, _ := t.Rat2(i) + rv = append(rv, fmt.Sprintf(`"%v/%v"`, n, d)) + case FloatVal: + v, _ := t.Float(i) + rv = append(rv, fmt.Sprintf("%v", v)) + case IntVal: + v, _ := t.Int(i) + rv = append(rv, fmt.Sprintf("%v", v)) + } + } + return []byte(fmt.Sprintf(`[%s]`, strings.Join(rv, ","))), nil +} + +func nullString(in []byte) []byte { + rv := bytes.Buffer{} + rv.WriteByte('"') + for _, b := range in { + if unicode.IsPrint(rune(b)) { + rv.WriteByte(b) + } + } + rv.WriteByte('"') + rvb := rv.Bytes() + if utf8.Valid(rvb) { + return rvb + } + return []byte(`""`) +} + +type wrongFmtErr struct { + From, To string +} + +func (e *wrongFmtErr) Error() string { + return fmt.Sprintf("cannot convert tag type '%v' into '%v'", e.From, e.To) +} diff --git a/Godeps/_workspace/src/github.com/rwcarlsen/goexif/tiff/tiff.go b/Godeps/_workspace/src/github.com/rwcarlsen/goexif/tiff/tiff.go new file mode 100644 index 000000000..771e91878 --- /dev/null +++ b/Godeps/_workspace/src/github.com/rwcarlsen/goexif/tiff/tiff.go @@ -0,0 +1,153 @@ +// Package tiff implements TIFF decoding as defined in TIFF 6.0 specification at +// http://partners.adobe.com/public/developer/en/tiff/TIFF6.pdf +package tiff + +import ( + "bytes" + "encoding/binary" + "errors" + "fmt" + "io" + "io/ioutil" +) + +// ReadAtReader is used when decoding Tiff tags and directories +type ReadAtReader interface { + io.Reader + io.ReaderAt +} + +// Tiff provides access to a decoded tiff data structure. +type Tiff struct { + // Dirs is an ordered slice of the tiff's Image File Directories (IFDs). + // The IFD at index 0 is IFD0. + Dirs []*Dir + // The tiff's byte-encoding (i.e. big/little endian). + Order binary.ByteOrder +} + +// Decode parses tiff-encoded data from r and returns a Tiff struct that +// reflects the structure and content of the tiff data. The first read from r +// should be the first byte of the tiff-encoded data and not necessarily the +// first byte of an os.File object. +func Decode(r io.Reader) (*Tiff, error) { + data, err := ioutil.ReadAll(r) + if err != nil { + return nil, errors.New("tiff: could not read data") + } + buf := bytes.NewReader(data) + + t := new(Tiff) + + // read byte order + bo := make([]byte, 2) + if _, err = io.ReadFull(buf, bo); err != nil { + return nil, errors.New("tiff: could not read tiff byte order") + } + if string(bo) == "II" { + t.Order = binary.LittleEndian + } else if string(bo) == "MM" { + t.Order = binary.BigEndian + } else { + return nil, errors.New("tiff: could not read tiff byte order") + } + + // check for special tiff marker + var sp int16 + err = binary.Read(buf, t.Order, &sp) + if err != nil || 42 != sp { + return nil, errors.New("tiff: could not find special tiff marker") + } + + // load offset to first IFD + var offset int32 + err = binary.Read(buf, t.Order, &offset) + if err != nil { + return nil, errors.New("tiff: could not read offset to first IFD") + } + + // load IFD's + var d *Dir + prev := offset + for offset != 0 { + // seek to offset + _, err := buf.Seek(int64(offset), 0) + if err != nil { + return nil, errors.New("tiff: seek to IFD failed") + } + + if buf.Len() == 0 { + return nil, errors.New("tiff: seek offset after EOF") + } + + // load the dir + d, offset, err = DecodeDir(buf, t.Order) + if err != nil { + return nil, err + } + + if offset == prev { + return nil, errors.New("tiff: recursive IFD") + } + prev = offset + + t.Dirs = append(t.Dirs, d) + } + + return t, nil +} + +func (tf *Tiff) String() string { + var buf bytes.Buffer + fmt.Fprint(&buf, "Tiff{") + for _, d := range tf.Dirs { + fmt.Fprintf(&buf, "%s, ", d.String()) + } + fmt.Fprintf(&buf, "}") + return buf.String() +} + +// Dir provides access to the parsed content of a tiff Image File Directory (IFD). +type Dir struct { + Tags []*Tag +} + +// DecodeDir parses a tiff-encoded IFD from r and returns a Dir object. offset +// is the offset to the next IFD. The first read from r should be at the first +// byte of the IFD. ReadAt offsets should generally be relative to the +// beginning of the tiff structure (not relative to the beginning of the IFD). +func DecodeDir(r ReadAtReader, order binary.ByteOrder) (d *Dir, offset int32, err error) { + d = new(Dir) + + // get num of tags in ifd + var nTags int16 + err = binary.Read(r, order, &nTags) + if err != nil { + return nil, 0, errors.New("tiff: failed to read IFD tag count: " + err.Error()) + } + + // load tags + for n := 0; n < int(nTags); n++ { + t, err := DecodeTag(r, order) + if err != nil { + return nil, 0, err + } + d.Tags = append(d.Tags, t) + } + + // get offset to next ifd + err = binary.Read(r, order, &offset) + if err != nil { + return nil, 0, errors.New("tiff: falied to read offset to next IFD: " + err.Error()) + } + + return d, offset, nil +} + +func (d *Dir) String() string { + s := "Dir{" + for _, t := range d.Tags { + s += t.String() + ", " + } + return s + "}" +} diff --git a/Godeps/_workspace/src/github.com/rwcarlsen/goexif/tiff/tiff_test.go b/Godeps/_workspace/src/github.com/rwcarlsen/goexif/tiff/tiff_test.go new file mode 100644 index 000000000..5db348dc8 --- /dev/null +++ b/Godeps/_workspace/src/github.com/rwcarlsen/goexif/tiff/tiff_test.go @@ -0,0 +1,235 @@ +package tiff + +import ( + "bytes" + "encoding/binary" + "encoding/hex" + "flag" + "os" + "path/filepath" + "testing" +) + +var dataDir = flag.String("test_data_dir", ".", "Directory where the data files for testing are located") + +type input struct { + tgId string + tpe string + nVals string + offset string + val string +} + +type output struct { + id uint16 + typ DataType + count uint32 + val []byte +} + +type tagTest struct { + big input // big endian + little input // little endian + out output +} + +/////////////////////////////////////////////// +//// Big endian Tests ///////////////////////// +/////////////////////////////////////////////// +var set1 = []tagTest{ + //////////// string type ////////////// + tagTest{ + // {"TgId", "TYPE", "N-VALUES", "OFFSET--", "VAL..."}, + input{"0003", "0002", "00000002", "11000000", ""}, + input{"0300", "0200", "02000000", "11000000", ""}, + output{0x0003, DataType(0x0002), 0x0002, []byte{0x11, 0x00}}, + }, + tagTest{ + input{"0001", "0002", "00000006", "00000012", "111213141516"}, + input{"0100", "0200", "06000000", "12000000", "111213141516"}, + output{0x0001, DataType(0x0002), 0x0006, []byte{0x11, 0x12, 0x13, 0x14, 0x15, 0x16}}, + }, + //////////// int (1-byte) type //////////////// + tagTest{ + input{"0001", "0001", "00000001", "11000000", ""}, + input{"0100", "0100", "01000000", "11000000", ""}, + output{0x0001, DataType(0x0001), 0x0001, []byte{0x11}}, + }, + tagTest{ + input{"0001", "0001", "00000005", "00000010", "1112131415"}, + input{"0100", "0100", "05000000", "10000000", "1112131415"}, + output{0x0001, DataType(0x0001), 0x0005, []byte{0x11, 0x12, 0x13, 0x14, 0x15}}, + }, + tagTest{ + input{"0001", "0006", "00000001", "11000000", ""}, + input{"0100", "0600", "01000000", "11000000", ""}, + output{0x0001, DataType(0x0006), 0x0001, []byte{0x11}}, + }, + tagTest{ + input{"0001", "0006", "00000005", "00000010", "1112131415"}, + input{"0100", "0600", "05000000", "10000000", "1112131415"}, + output{0x0001, DataType(0x0006), 0x0005, []byte{0x11, 0x12, 0x13, 0x14, 0x15}}, + }, + //////////// int (2-byte) types //////////////// + tagTest{ + input{"0001", "0003", "00000002", "11111212", ""}, + input{"0100", "0300", "02000000", "11111212", ""}, + output{0x0001, DataType(0x0003), 0x0002, []byte{0x11, 0x11, 0x12, 0x12}}, + }, + tagTest{ + input{"0001", "0003", "00000003", "00000010", "111213141516"}, + input{"0100", "0300", "03000000", "10000000", "111213141516"}, + output{0x0001, DataType(0x0003), 0x0003, []byte{0x11, 0x12, 0x13, 0x14, 0x15, 0x16}}, + }, + tagTest{ + input{"0001", "0008", "00000001", "11120000", ""}, + input{"0100", "0800", "01000000", "11120000", ""}, + output{0x0001, DataType(0x0008), 0x0001, []byte{0x11, 0x12}}, + }, + tagTest{ + input{"0001", "0008", "00000003", "00000100", "111213141516"}, + input{"0100", "0800", "03000000", "00100000", "111213141516"}, + output{0x0001, DataType(0x0008), 0x0003, []byte{0x11, 0x12, 0x13, 0x14, 0x15, 0x16}}, + }, + //////////// int (4-byte) types //////////////// + tagTest{ + input{"0001", "0004", "00000001", "11121314", ""}, + input{"0100", "0400", "01000000", "11121314", ""}, + output{0x0001, DataType(0x0004), 0x0001, []byte{0x11, 0x12, 0x13, 0x14}}, + }, + tagTest{ + input{"0001", "0004", "00000002", "00000010", "1112131415161718"}, + input{"0100", "0400", "02000000", "10000000", "1112131415161718"}, + output{0x0001, DataType(0x0004), 0x0002, []byte{0x11, 0x12, 0x13, 0x14, 0x15, 0x16, 0x17, 0x18}}, + }, + tagTest{ + input{"0001", "0009", "00000001", "11121314", ""}, + input{"0100", "0900", "01000000", "11121314", ""}, + output{0x0001, DataType(0x0009), 0x0001, []byte{0x11, 0x12, 0x13, 0x14}}, + }, + tagTest{ + input{"0001", "0009", "00000002", "00000011", "1112131415161819"}, + input{"0100", "0900", "02000000", "11000000", "1112131415161819"}, + output{0x0001, DataType(0x0009), 0x0002, []byte{0x11, 0x12, 0x13, 0x14, 0x15, 0x16, 0x18, 0x19}}, + }, + //////////// rational types //////////////////// + tagTest{ + input{"0001", "0005", "00000001", "00000010", "1112131415161718"}, + input{"0100", "0500", "01000000", "10000000", "1112131415161718"}, + output{0x0001, DataType(0x0005), 0x0001, []byte{0x11, 0x12, 0x13, 0x14, 0x15, 0x16, 0x17, 0x18}}, + }, + tagTest{ + input{"0001", "000A", "00000001", "00000011", "1112131415161819"}, + input{"0100", "0A00", "01000000", "11000000", "1112131415161819"}, + output{0x0001, DataType(0x000A), 0x0001, []byte{0x11, 0x12, 0x13, 0x14, 0x15, 0x16, 0x18, 0x19}}, + }, + //////////// float types /////////////////////// + tagTest{ + input{"0001", "0005", "00000001", "00000010", "1112131415161718"}, + input{"0100", "0500", "01000000", "10000000", "1112131415161718"}, + output{0x0001, DataType(0x0005), 0x0001, []byte{0x11, 0x12, 0x13, 0x14, 0x15, 0x16, 0x17, 0x18}}, + }, + tagTest{ + input{"0101", "000A", "00000001", "00000011", "1112131415161819"}, + input{"0101", "0A00", "01000000", "11000000", "1112131415161819"}, + output{0x0101, DataType(0x000A), 0x0001, []byte{0x11, 0x12, 0x13, 0x14, 0x15, 0x16, 0x18, 0x19}}, + }, +} + +func TestDecodeTag(t *testing.T) { + for i, tst := range set1 { + testSingle(t, binary.BigEndian, tst.big, tst.out, i) + testSingle(t, binary.LittleEndian, tst.little, tst.out, i) + } +} + +func testSingle(t *testing.T, order binary.ByteOrder, in input, out output, i int) { + data := buildInput(in, order) + buf := bytes.NewReader(data) + tg, err := DecodeTag(buf, order) + if err != nil { + t.Errorf("(%v) tag %v%+v decode failed: %v", order, i, in, err) + return + } + + if tg.Id != out.id { + t.Errorf("(%v) tag %v id decode: expected %v, got %v", order, i, out.id, tg.Id) + } + if tg.Type != out.typ { + t.Errorf("(%v) tag %v type decode: expected %v, got %v", order, i, out.typ, tg.Type) + } + if tg.Count != out.count { + t.Errorf("(%v) tag %v component count decode: expected %v, got %v", order, i, out.count, tg.Count) + } + if !bytes.Equal(tg.Val, out.val) { + t.Errorf("(%v) tag %v value decode: expected %v, got %v", order, i, out.val, tg.Val) + } +} + +// buildInputBig creates a byte-slice based on big-endian ordered input +func buildInput(in input, order binary.ByteOrder) []byte { + data := make([]byte, 0) + d, _ := hex.DecodeString(in.tgId) + data = append(data, d...) + d, _ = hex.DecodeString(in.tpe) + data = append(data, d...) + d, _ = hex.DecodeString(in.nVals) + data = append(data, d...) + d, _ = hex.DecodeString(in.offset) + data = append(data, d...) + + if in.val != "" { + off := order.Uint32(d) + for i := 0; i < int(off)-12; i++ { + data = append(data, 0xFF) + } + + d, _ = hex.DecodeString(in.val) + data = append(data, d...) + } + + return data +} + +func TestDecode(t *testing.T) { + name := filepath.Join(*dataDir, "sample1.tif") + f, err := os.Open(name) + if err != nil { + t.Fatalf("%v\n", err) + } + + tif, err := Decode(f) + if err != nil { + t.Fatal(err) + } + + t.Log(tif) +} + +func TestDecodeTag_blob(t *testing.T) { + buf := bytes.NewReader(data()) + buf.Seek(10, 1) + tg, err := DecodeTag(buf, binary.LittleEndian) + if err != nil { + t.Fatalf("tag decode failed: %v", err) + } + + t.Logf("tag: %v+\n", tg) + n, d, err := tg.Rat2(0) + if err != nil { + t.Fatalf("tag decoded wrong type: %v", err) + } + t.Logf("tag rat val: %v/%v\n", n, d) +} + +func data() []byte { + s1 := "49492A000800000002001A0105000100" + s1 += "00002600000069870400010000001102" + s1 += "0000000000004800000001000000" + + dat, err := hex.DecodeString(s1) + if err != nil { + panic("invalid string fixture") + } + return dat +} |