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fix off-by-1 in alpha in colorshader setup

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don't promise HasSpan16 if we're supposed to dither



git-svn-id: http://skia.googlecode.com/svn/trunk@526 2bbb7eff-a529-9590-31e7-b0007b416f81
This commit is contained in:
reed@android.com 2010-03-11 21:56:16 +00:00
parent 8e4c93b04c
commit 8f073382bb
1 changed files with 7 additions and 5 deletions
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12
src/core/SkShader.cpp
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@ -256,14 +256,16 @@ bool SkColorShader::setContext(const SkBitmap& device, const SkPaint& paint,
fColor16 = SkPack888ToRGB16(r, g, b);
if (a != 255) {
a = SkAlpha255To256(a);
r = SkAlphaMul(r, a);
g = SkAlphaMul(g, a);
b = SkAlphaMul(b, a);
r = SkMulDiv255Round(r, a);
g = SkMulDiv255Round(g, a);
b = SkMulDiv255Round(b, a);
}
fPMColor = SkPackARGB32(a, r, g, b);
fFlags = kHasSpan16_Flag | kConstInY32_Flag;
fFlags = kConstInY32_Flag;
if (paint.isDither() == false) {
fFlags |= kHasSpan16_Flag;
}
if (SkGetPackedA32(fPMColor) == 255) {
fFlags |= kOpaqueAlpha_Flag;
}