1 files changed, 112 insertions, 0 deletions
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
+}