diff options
Diffstat (limited to 'Godeps/_workspace/src/github.com/mattermost/rsc/qr/web/resize/resize.go')
| -rw-r--r-- | Godeps/_workspace/src/github.com/mattermost/rsc/qr/web/resize/resize.go | 152 |
1 files changed, 0 insertions, 152 deletions
diff --git a/Godeps/_workspace/src/github.com/mattermost/rsc/qr/web/resize/resize.go b/Godeps/_workspace/src/github.com/mattermost/rsc/qr/web/resize/resize.go deleted file mode 100644 index 02c8b0040..000000000 --- a/Godeps/_workspace/src/github.com/mattermost/rsc/qr/web/resize/resize.go +++ /dev/null @@ -1,152 +0,0 @@ -// Copyright 2011 The 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 resize - -import ( - "image" - "image/color" -) - -// average convert the sums to averages and returns the result. -func average(sum []uint64, w, h int, n uint64) *image.RGBA { - ret := image.NewRGBA(image.Rect(0, 0, w, h)) - for y := 0; y < h; y++ { - for x := 0; x < w; x++ { - index := 4 * (y*w + x) - pix := ret.Pix[y*ret.Stride+x*4:] - pix[0] = uint8(sum[index+0] / n) - pix[1] = uint8(sum[index+1] / n) - pix[2] = uint8(sum[index+2] / n) - pix[3] = uint8(sum[index+3] / n) - } - } - return ret -} - -// ResizeRGBA returns a scaled copy of the RGBA image slice r of m. -// The returned image has width w and height h. -func ResizeRGBA(m *image.RGBA, r image.Rectangle, w, h int) *image.RGBA { - ww, hh := uint64(w), uint64(h) - dx, dy := uint64(r.Dx()), uint64(r.Dy()) - // See comment in Resize. - n, sum := dx*dy, make([]uint64, 4*w*h) - for y := r.Min.Y; y < r.Max.Y; y++ { - pix := m.Pix[(y-r.Min.Y)*m.Stride:] - for x := r.Min.X; x < r.Max.X; x++ { - // Get the source pixel. - p := pix[(x-r.Min.X)*4:] - r64 := uint64(p[0]) - g64 := uint64(p[1]) - b64 := uint64(p[2]) - a64 := uint64(p[3]) - // Spread the source pixel over 1 or more destination rows. - py := uint64(y) * hh - for remy := hh; remy > 0; { - qy := dy - (py % dy) - if qy > remy { - qy = remy - } - // Spread the source pixel over 1 or more destination columns. - px := uint64(x) * ww - index := 4 * ((py/dy)*ww + (px / dx)) - for remx := ww; remx > 0; { - qx := dx - (px % dx) - if qx > remx { - qx = remx - } - qxy := qx * qy - sum[index+0] += r64 * qxy - sum[index+1] += g64 * qxy - sum[index+2] += b64 * qxy - sum[index+3] += a64 * qxy - index += 4 - px += qx - remx -= qx - } - py += qy - remy -= qy - } - } - } - return average(sum, w, h, n) -} - -// ResizeNRGBA returns a scaled copy of the RGBA image slice r of m. -// The returned image has width w and height h. -func ResizeNRGBA(m *image.NRGBA, r image.Rectangle, w, h int) *image.RGBA { - ww, hh := uint64(w), uint64(h) - dx, dy := uint64(r.Dx()), uint64(r.Dy()) - // See comment in Resize. - n, sum := dx*dy, make([]uint64, 4*w*h) - for y := r.Min.Y; y < r.Max.Y; y++ { - pix := m.Pix[(y-r.Min.Y)*m.Stride:] - for x := r.Min.X; x < r.Max.X; x++ { - // Get the source pixel. - p := pix[(x-r.Min.X)*4:] - r64 := uint64(p[0]) - g64 := uint64(p[1]) - b64 := uint64(p[2]) - a64 := uint64(p[3]) - r64 = (r64 * a64) / 255 - g64 = (g64 * a64) / 255 - b64 = (b64 * a64) / 255 - // Spread the source pixel over 1 or more destination rows. - py := uint64(y) * hh - for remy := hh; remy > 0; { - qy := dy - (py % dy) - if qy > remy { - qy = remy - } - // Spread the source pixel over 1 or more destination columns. - px := uint64(x) * ww - index := 4 * ((py/dy)*ww + (px / dx)) - for remx := ww; remx > 0; { - qx := dx - (px % dx) - if qx > remx { - qx = remx - } - qxy := qx * qy - sum[index+0] += r64 * qxy - sum[index+1] += g64 * qxy - sum[index+2] += b64 * qxy - sum[index+3] += a64 * qxy - index += 4 - px += qx - remx -= qx - } - py += qy - remy -= qy - } - } - } - return average(sum, w, h, n) -} - -// Resample returns a resampled copy of the image slice r of m. -// The returned image has width w and height h. -func Resample(m image.Image, r image.Rectangle, w, h int) *image.RGBA { - if w < 0 || h < 0 { - return nil - } - if w == 0 || h == 0 || r.Dx() <= 0 || r.Dy() <= 0 { - return image.NewRGBA(image.Rect(0, 0, w, h)) - } - curw, curh := r.Dx(), r.Dy() - img := image.NewRGBA(image.Rect(0, 0, w, h)) - for y := 0; y < h; y++ { - for x := 0; x < w; x++ { - // Get a source pixel. - subx := x * curw / w - suby := y * curh / h - r32, g32, b32, a32 := m.At(subx, suby).RGBA() - r := uint8(r32 >> 8) - g := uint8(g32 >> 8) - b := uint8(b32 >> 8) - a := uint8(a32 >> 8) - img.SetRGBA(x, y, color.RGBA{r, g, b, a}) - } - } - return img -} |