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freetype: update for image.Pix changes (again).

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R=r
CC=golang-dev
http://codereview.appspot.com/4702041
This commit is contained in:
Nigel Tao 2011-07-12 16:41:03 +10:00
parent 43d4d89685
commit 006c241eaa
1 changed files with 26 additions and 30 deletions
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56
freetype/raster/paint.go
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@ -62,9 +62,8 @@ func (r AlphaOverPainter) Paint(ss []Span, done bool) {
p := r.Image.Pix[base+s.X0 : base+s.X1]
a := int(s.A >> 24)
for i, c := range p {
v := int(c.A)
v = (v*255 + (255-v)*a) / 255
p[i] = image.AlphaColor{uint8(v)}
v := int(c)
p[i] = uint8((v*255 + (255-v)*a) / 255)
}
}
}
@ -101,7 +100,7 @@ func (r AlphaSrcPainter) Paint(ss []Span, done bool) {
}
base := (s.Y-r.Image.Rect.Min.Y)*r.Image.Stride - r.Image.Rect.Min.X
p := r.Image.Pix[base+s.X0 : base+s.X1]
color := image.AlphaColor{uint8(s.A >> 24)}
color := uint8(s.A >> 24)
for i := range p {
p[i] = color
}
@ -141,32 +140,29 @@ func (r *RGBAPainter) Paint(ss []Span, done bool) {
if s.X0 >= s.X1 {
continue
}
base := (s.Y-r.Image.Rect.Min.Y)*r.Image.Stride - r.Image.Rect.Min.X
p := r.Image.Pix[base+s.X0 : base+s.X1]
for i, rgba := range p {
// This code is duplicated from drawGlyphOver in $GOROOT/src/pkg/exp/draw/draw.go.
// TODO(nigeltao): Factor out common code into a utility function, once the compiler
// can inline such function calls.
ma := s.A >> 16
const M = 1<<16 - 1
if r.Op == draw.Over {
dr := uint32(rgba.R)
dg := uint32(rgba.G)
db := uint32(rgba.B)
da := uint32(rgba.A)
a := M - (r.ca * ma / M)
a *= 0x101
dr = (dr*a + r.cr*ma) / M
dg = (dg*a + r.cg*ma) / M
db = (db*a + r.cb*ma) / M
da = (da*a + r.ca*ma) / M
p[i] = image.RGBAColor{uint8(dr >> 8), uint8(dg >> 8), uint8(db >> 8), uint8(da >> 8)}
} else {
dr := r.cr * ma / M
dg := r.cg * ma / M
db := r.cb * ma / M
da := r.ca * ma / M
p[i] = image.RGBAColor{uint8(dr >> 8), uint8(dg >> 8), uint8(db >> 8), uint8(da >> 8)}
// This code is similar to drawGlyphOver in $GOROOT/src/pkg/image/draw/draw.go.
ma := s.A >> 16
const m = 1<<16 - 1
i0 := (s.Y-r.Image.Rect.Min.Y)*r.Image.Stride + (s.X0-r.Image.Rect.Min.X)*4
i1 := i0 + (s.X1-s.X0)*4
if r.Op == draw.Over {
for i := i0; i < i1; i += 4 {
dr := uint32(r.Image.Pix[i+0])
dg := uint32(r.Image.Pix[i+1])
db := uint32(r.Image.Pix[i+2])
da := uint32(r.Image.Pix[i+3])
a := (m - (r.ca * ma / m)) * 0x101
r.Image.Pix[i+0] = uint8((dr*a + r.cr*ma) / m >> 8)
r.Image.Pix[i+1] = uint8((dg*a + r.cg*ma) / m >> 8)
r.Image.Pix[i+2] = uint8((db*a + r.cb*ma) / m >> 8)
r.Image.Pix[i+3] = uint8((da*a + r.ca*ma) / m >> 8)
}
} else {
for i := i0; i < i1; i += 4 {
r.Image.Pix[i+0] = uint8(r.cr * ma / m >> 8)
r.Image.Pix[i+1] = uint8(r.cg * ma / m >> 8)
r.Image.Pix[i+2] = uint8(r.cb * ma / m >> 8)
r.Image.Pix[i+3] = uint8(r.ca * ma / m >> 8)
}
}
}