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implement SkPixmap::getPixel() with this->readPixels().

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Yet another big old switch statement I don't want to maintain.

Once again, I think this at least makes it explicit that we're
returning an SkColor in the colorspace of the pixmap.

Change-Id: I34aa7312c0a1670910586fc5a4b1951275e73e2e
Reviewed-on: https://skia-review.googlesource.com/154864
Reviewed-by: Brian Osman <brianosman@google.com>
Commit-Queue: Mike Klein <mtklein@google.com>
This commit is contained in:
Mike Klein 2018-09-17 13:48:31 -04:00 committed by Skia Commit-Bot
parent 42f29f1181
commit 0944ae8afb
1 changed files with 6 additions and 92 deletions
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98
src/core/SkPixmap.cpp
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@ -190,98 +190,12 @@ SkColor SkPixmap::getColor(int x, int y) const {
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);
return SkColorSetRGB(value, value, value);
}
case kAlpha_8_SkColorType: {
return SkColorSetA(0, *this->addr8(x, y));
}
case kRGB_565_SkColorType: {
return SkPixel16ToColor(*this->addr16(x, y));
}
case kARGB_4444_SkColorType: {
uint16_t value = *this->addr16(x, y);
SkPMColor c = SkPixel4444ToPixel32(value);
return toColor(c);
}
case kRGB_888x_SkColorType: {
uint32_t value = *this->addr32(x, y);
return SkSwizzle_RB(value | 0xff000000);
}
case kBGRA_8888_SkColorType: {
uint32_t value = *this->addr32(x, y);
SkPMColor c = SkSwizzle_BGRA_to_PMColor(value);
return toColor(c);
}
case kRGBA_8888_SkColorType: {
uint32_t value = *this->addr32(x, y);
SkPMColor c = SkSwizzle_RGBA_to_PMColor(value);
return toColor(c);
}
case kRGB_101010x_SkColorType: {
uint32_t value = *this->addr32(x, y);
// Convert 10-bit rgb to 8-bit bgr, and mask in 0xff alpha at the top.
return (uint32_t)( ((value >> 0) & 0x3ff) * (255/1023.0f) ) << 16
| (uint32_t)( ((value >> 10) & 0x3ff) * (255/1023.0f) ) << 8
| (uint32_t)( ((value >> 20) & 0x3ff) * (255/1023.0f) ) << 0
| 0xff000000;
}
case kRGBA_1010102_SkColorType: {
uint32_t value = *this->addr32(x, y);
float r = ((value >> 0) & 0x3ff) * (1/1023.0f),
g = ((value >> 10) & 0x3ff) * (1/1023.0f),
b = ((value >> 20) & 0x3ff) * (1/1023.0f),
a = ((value >> 30) & 0x3 ) * (1/ 3.0f);
if (a != 0 && needsUnpremul) {
r *= (1.0f/a);
g *= (1.0f/a);
b *= (1.0f/a);
}
return (uint32_t)( r * 255.0f ) << 16
| (uint32_t)( g * 255.0f ) << 8
| (uint32_t)( b * 255.0f ) << 0
| (uint32_t)( a * 255.0f ) << 24;
}
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] && needsUnpremul) {
float inva = 1 / p4[3];
p4 = p4 * Sk4f(inva, inva, inva, 1);
}
SkColor c;
SkNx_cast<uint8_t>(p4 * Sk4f(255) + Sk4f(0.5f)).store(&c);
// p4 is RGBA, but we want BGRA, so we need to swap next
return SkSwizzle_RB(c);
}
case kRGBA_F32_SkColorType: {
const float* rgba =
(const float*)fPixels + 4*y*(fRowBytes >> 4) + 4*x;
Sk4f p4 = Sk4f::Load(rgba);
// From here on, just like F16:
if (p4[3] && needsUnpremul) {
float inva = 1 / p4[3];
p4 = p4 * Sk4f(inva, inva, inva, 1);
}
SkColor c;
SkNx_cast<uint8_t>(p4 * Sk4f(255) + Sk4f(0.5f)).store(&c);
// p4 is RGBA, but we want BGRA, so we need to swap next
return SkSwizzle_RB(c);
}
default:
SkDEBUGFAIL("");
return SkColorSetARGB(0, 0, 0, 0);
}
SkColor result;
auto info = SkImageInfo::Make(1,1,
kBGRA_8888_SkColorType,kUnpremul_SkAlphaType,
sk_ref_sp(this->colorSpace()));
SkAssertResult(this->readPixels(info, &result, sizeof(result), x,y));
return result;
}
bool SkPixmap::computeIsOpaque() const {