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Make SkPixmap::getColor support kUnpremul pixels

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Bug: skia:6319
Change-Id: Id5ad27b4e85516dfdad0c127655e6272bc0a39ac
Reviewed-on: https://skia-review.googlesource.com/19089
Commit-Queue: Matt Sarett <msarett@google.com>
Reviewed-by: Mike Klein <mtklein@chromium.org>
This commit is contained in:
Matt Sarett 2017-06-09 09:54:55 -04:00 committed by Skia Commit-Bot
parent 39afa1226f
commit 9466bf5694
1 changed files with 13 additions and 6 deletions
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19
src/core/SkPixmap.cpp
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@ -257,6 +257,13 @@ SkColor SkPixmap::getColor(int x, int y) const {
SkASSERT(this->addr());
SkASSERT((unsigned)x < (unsigned)this->width());
SkASSERT((unsigned)y < (unsigned)this->height());
const bool needsUnpremul = (kPremul_SkAlphaType == fInfo.alphaType());
auto toColor = [needsUnpremul](uint32_t maybePremulColor) {
return needsUnpremul ? SkUnPreMultiply::PMColorToColor(maybePremulColor)
: SkSwizzle_BGRA_to_PMColor(maybePremulColor);
};
switch (this->colorType()) {
case kGray_8_SkColorType: {
uint8_t value = *this->addr8(x, y);
@ -267,8 +274,8 @@ SkColor SkPixmap::getColor(int x, int y) const {
}
case kIndex_8_SkColorType: {
SkASSERT(this->ctable());
SkPMColor pmColor = (*this->ctable())[*this->addr8(x, y)];
return SkUnPreMultiply::PMColorToColor(pmColor);
SkPMColor c = (*this->ctable())[*this->addr8(x, y)];
return toColor(c);
}
case kRGB_565_SkColorType: {
return SkPixel16ToColor(*this->addr16(x, y));
@ -276,23 +283,23 @@ SkColor SkPixmap::getColor(int x, int y) const {
case kARGB_4444_SkColorType: {
uint16_t value = *this->addr16(x, y);
SkPMColor c = SkPixel4444ToPixel32(value);
return SkUnPreMultiply::PMColorToColor(c);
return toColor(c);
}
case kBGRA_8888_SkColorType: {
uint32_t value = *this->addr32(x, y);
SkPMColor c = SkSwizzle_BGRA_to_PMColor(value);
return SkUnPreMultiply::PMColorToColor(c);
return toColor(c);
}
case kRGBA_8888_SkColorType: {
uint32_t value = *this->addr32(x, y);
SkPMColor c = SkSwizzle_RGBA_to_PMColor(value);
return SkUnPreMultiply::PMColorToColor(c);
return toColor(c);
}
case kRGBA_F16_SkColorType: {
const uint64_t* addr =
(const uint64_t*)fPixels + y * (fRowBytes >> 3) + x;
Sk4f p4 = SkHalfToFloat_finite_ftz(*addr);
if (p4[3]) {
if (p4[3] && needsUnpremul) {
float inva = 1 / p4[3];
p4 = p4 * Sk4f(inva, inva, inva, 1);
}