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exp/draw: fix drawRGBA when x0 > x1 and we have to draw right-to-left.

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R=r
CC=golang-dev
https://golang.org/cl/1940042
This commit is contained in:
Nigel Tao 2010-08-11 10:10:17 +10:00
parent 2bf8741c0f
commit 753c9b5710
1 changed files with 4 additions and 5 deletions
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9
src/pkg/exp/draw/draw.go
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@ -293,9 +293,8 @@ func drawRGBA(dst *image.RGBA, r image.Rectangle, src image.Image, sp image.Poin
for y := y0; y != y1; y, sy, my = y+dy, sy+dy, my+dy {
sx := sp.X + x0 - r.Min.X
mx := mp.X + x0 - r.Min.X
dbase := y * dst.Stride
dpix := dst.Pix[dbase+x0 : dbase+x1]
for i, rgba := range dpix {
dpix := dst.Pix[y*dst.Stride : (y+1)*dst.Stride]
for x := x0; x != x1; x, sx, mx = x+dx, sx+dx, mx+dx {
ma := uint32(m)
if mask != nil {
_, _, _, ma = mask.At(mx, my).RGBA()
@ -303,6 +302,7 @@ func drawRGBA(dst *image.RGBA, r image.Rectangle, src image.Image, sp image.Poin
sr, sg, sb, sa := src.At(sx, sy).RGBA()
var dr, dg, db, da uint32
if op == Over {
rgba := dpix[x]
dr = uint32(rgba.R)
dg = uint32(rgba.G)
db = uint32(rgba.B)
@ -324,8 +324,7 @@ func drawRGBA(dst *image.RGBA, r image.Rectangle, src image.Image, sp image.Poin
db = sb * ma / m
da = sa * ma / m
}
dpix[i] = image.RGBAColor{uint8(dr >> 8), uint8(dg >> 8), uint8(db >> 8), uint8(da >> 8)}
sx, mx = sx+dx, mx+dx
dpix[x] = image.RGBAColor{uint8(dr >> 8), uint8(dg >> 8), uint8(db >> 8), uint8(da >> 8)}
}
}
}