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#include "SkConfig8888.h"
namespace {
template <int A_IDX, int R_IDX, int G_IDX, int B_IDX>
inline uint32_t pack_config8888(uint32_t a, uint32_t r,
uint32_t g, uint32_t b) {
#ifdef SK_CPU_LENDIAN
return (a << (A_IDX * 8)) | (r << (R_IDX * 8)) |
(g << (G_IDX * 8)) | (b << (B_IDX * 8));
#else
return (a << ((3-A_IDX) * 8)) | (r << ((3-R_IDX) * 8)) |
(g << ((3-G_IDX) * 8)) | (b << ((3-B_IDX) * 8));
#endif
}
template <int A_IDX, int R_IDX, int G_IDX, int B_IDX>
inline void unpack_config8888(uint32_t color,
uint32_t* a, uint32_t* r,
uint32_t* g, uint32_t* b) {
#ifdef SK_CPU_LENDIAN
*a = (color >> (A_IDX * 8)) & 0xff;
*r = (color >> (R_IDX * 8)) & 0xff;
*g = (color >> (G_IDX * 8)) & 0xff;
*b = (color >> (B_IDX * 8)) & 0xff;
#else
*a = (color >> ((3 - A_IDX) * 8)) & 0xff;
*r = (color >> ((3 - R_IDX) * 8)) & 0xff;
*g = (color >> ((3 - G_IDX) * 8)) & 0xff;
*b = (color >> ((3 - B_IDX) * 8)) & 0xff;
#endif
}
#ifdef SK_CPU_LENDIAN
static const int SK_NATIVE_A_IDX = SK_A32_SHIFT / 8;
static const int SK_NATIVE_R_IDX = SK_R32_SHIFT / 8;
static const int SK_NATIVE_G_IDX = SK_G32_SHIFT / 8;
static const int SK_NATIVE_B_IDX = SK_B32_SHIFT / 8;
#else
static const int SK_NATIVE_A_IDX = 3 - (SK_A32_SHIFT / 8);
static const int SK_NATIVE_R_IDX = 3 - (SK_R32_SHIFT / 8);
static const int SK_NATIVE_G_IDX = 3 - (SK_G32_SHIFT / 8);
static const int SK_NATIVE_B_IDX = 3 - (SK_B32_SHIFT / 8);
#endif
/**
* convert_pixel<OUT_CFG, IN_CFG converts a pixel value from one Config8888 to
* another. It is implemented by first expanding OUT_CFG to r, g, b, a indices
* and an is_premul bool as params to another template function. Then IN_CFG is
* expanded via another function call.
*/
template <bool OUT_PM, int OUT_A_IDX, int OUT_R_IDX, int OUT_G_IDX, int OUT_B_IDX,
bool IN_PM, int IN_A_IDX, int IN_R_IDX, int IN_G_IDX, int IN_B_IDX>
inline uint32_t convert_pixel(uint32_t pixel) {
uint32_t a, r, g, b;
unpack_config8888<IN_A_IDX, IN_R_IDX, IN_G_IDX, IN_B_IDX>(pixel, &a, &r, &g, &b);
if (IN_PM && !OUT_PM) {
// We're doing the explicit divide to match WebKit layout
// test expectations. We can modify and rebaseline if there
// it can be shown that there is a more performant way to
// unpremul.
if (a) {
r = r * 0xff / a;
g = g * 0xff / a;
b = b * 0xff / a;
} else {
return 0;
}
} else if (!IN_PM && OUT_PM) {
// This matches WebKit's conversion which we are replacing.
// We can consider alternative rounding rules for performance.
r = SkMulDiv255Ceiling(r, a);
g = SkMulDiv255Ceiling(g, a);
b = SkMulDiv255Ceiling(b, a);
}
return pack_config8888<OUT_A_IDX, OUT_R_IDX, OUT_G_IDX, OUT_B_IDX>(a, r, g, b);
}
template <bool OUT_PM, int OUT_A_IDX, int OUT_R_IDX, int OUT_G_IDX, int OUT_B_IDX, SkCanvas::Config8888 IN_CFG>
inline uint32_t convert_pixel(uint32_t pixel) {
switch(IN_CFG) {
case SkCanvas::kNative_Premul_Config8888:
return convert_pixel<OUT_PM, OUT_A_IDX, OUT_R_IDX, OUT_G_IDX, OUT_B_IDX,
true, SK_NATIVE_A_IDX, SK_NATIVE_R_IDX, SK_NATIVE_G_IDX, SK_NATIVE_B_IDX>(pixel);
break;
case SkCanvas::kNative_Unpremul_Config8888:
return convert_pixel<OUT_PM, OUT_A_IDX, OUT_R_IDX, OUT_G_IDX, OUT_B_IDX,
false, SK_NATIVE_A_IDX, SK_NATIVE_R_IDX, SK_NATIVE_G_IDX, SK_NATIVE_B_IDX>(pixel);
break;
case SkCanvas::kBGRA_Premul_Config8888:
return convert_pixel<OUT_PM, OUT_A_IDX, OUT_R_IDX, OUT_G_IDX, OUT_B_IDX,
true, 3, 2, 1, 0>(pixel);
break;
case SkCanvas::kBGRA_Unpremul_Config8888:
return convert_pixel<OUT_PM, OUT_A_IDX, OUT_R_IDX, OUT_G_IDX, OUT_B_IDX,
false, 3, 2, 1, 0>(pixel);
break;
case SkCanvas::kRGBA_Premul_Config8888:
return convert_pixel<OUT_PM, OUT_A_IDX, OUT_R_IDX, OUT_G_IDX, OUT_B_IDX,
true, 3, 0, 1, 2>(pixel);
break;
case SkCanvas::kRGBA_Unpremul_Config8888:
return convert_pixel<OUT_PM, OUT_A_IDX, OUT_R_IDX, OUT_G_IDX, OUT_B_IDX,
false, 3, 0, 1, 2>(pixel);
break;
default:
SkDEBUGFAIL("Unexpected config8888");
return 0;
break;
}
}
template <SkCanvas::Config8888 OUT_CFG, SkCanvas::Config8888 IN_CFG>
inline uint32_t convert_pixel(uint32_t pixel) {
switch(OUT_CFG) {
case SkCanvas::kNative_Premul_Config8888:
return convert_pixel<true, SK_NATIVE_A_IDX, SK_NATIVE_R_IDX, SK_NATIVE_G_IDX, SK_NATIVE_B_IDX, IN_CFG>(pixel);
break;
case SkCanvas::kNative_Unpremul_Config8888:
return convert_pixel<false, SK_NATIVE_A_IDX, SK_NATIVE_R_IDX, SK_NATIVE_G_IDX, SK_NATIVE_B_IDX, IN_CFG>(pixel);
break;
case SkCanvas::kBGRA_Premul_Config8888:
return convert_pixel<true, 3, 2, 1, 0, IN_CFG>(pixel);
break;
case SkCanvas::kBGRA_Unpremul_Config8888:
return convert_pixel<false, 3, 2, 1, 0, IN_CFG>(pixel);
break;
case SkCanvas::kRGBA_Premul_Config8888:
return convert_pixel<true, 3, 0, 1, 2, IN_CFG>(pixel);
break;
case SkCanvas::kRGBA_Unpremul_Config8888:
return convert_pixel<false, 3, 0, 1, 2, IN_CFG>(pixel);
break;
default:
SkDEBUGFAIL("Unexpected config8888");
return 0;
break;
}
}
/**
* SkConvertConfig8888Pixels has 6 * 6 possible combinations of src and dst
* configs. Each is implemented as an instantiation templated function. Two
* levels of switch statements are used to select the correct instantiation, one
* for the src config and one for the dst config.
*/
template <SkCanvas::Config8888 DST_CFG, SkCanvas::Config8888 SRC_CFG>
inline void convert_config8888(uint32_t* dstPixels,
size_t dstRowBytes,
const uint32_t* srcPixels,
size_t srcRowBytes,
int width,
int height) {
intptr_t dstPix = reinterpret_cast<intptr_t>(dstPixels);
intptr_t srcPix = reinterpret_cast<intptr_t>(srcPixels);
for (int y = 0; y < height; ++y) {
srcPixels = reinterpret_cast<const uint32_t*>(srcPix);
dstPixels = reinterpret_cast<uint32_t*>(dstPix);
for (int x = 0; x < width; ++x) {
dstPixels[x] = convert_pixel<DST_CFG, SRC_CFG>(srcPixels[x]);
}
dstPix += dstRowBytes;
srcPix += srcRowBytes;
}
}
template <SkCanvas::Config8888 SRC_CFG>
inline void convert_config8888(uint32_t* dstPixels,
size_t dstRowBytes,
SkCanvas::Config8888 dstConfig,
const uint32_t* srcPixels,
size_t srcRowBytes,
int width,
int height) {
switch(dstConfig) {
case SkCanvas::kNative_Premul_Config8888:
convert_config8888<SkCanvas::kNative_Premul_Config8888, SRC_CFG>(dstPixels, dstRowBytes, srcPixels, srcRowBytes, width, height);
break;
case SkCanvas::kNative_Unpremul_Config8888:
convert_config8888<SkCanvas::kNative_Unpremul_Config8888, SRC_CFG>(dstPixels, dstRowBytes, srcPixels, srcRowBytes, width, height);
break;
case SkCanvas::kBGRA_Premul_Config8888:
convert_config8888<SkCanvas::kBGRA_Premul_Config8888, SRC_CFG>(dstPixels, dstRowBytes, srcPixels, srcRowBytes, width, height);
break;
case SkCanvas::kBGRA_Unpremul_Config8888:
convert_config8888<SkCanvas::kBGRA_Unpremul_Config8888, SRC_CFG>(dstPixels, dstRowBytes, srcPixels, srcRowBytes, width, height);
break;
case SkCanvas::kRGBA_Premul_Config8888:
convert_config8888<SkCanvas::kRGBA_Premul_Config8888, SRC_CFG>(dstPixels, dstRowBytes, srcPixels, srcRowBytes, width, height);
break;
case SkCanvas::kRGBA_Unpremul_Config8888:
convert_config8888<SkCanvas::kRGBA_Unpremul_Config8888, SRC_CFG>(dstPixels, dstRowBytes, srcPixels, srcRowBytes, width, height);
break;
default:
SkDEBUGFAIL("Unexpected config8888");
break;
}
}
}
void SkConvertConfig8888Pixels(uint32_t* dstPixels,
size_t dstRowBytes,
SkCanvas::Config8888 dstConfig,
const uint32_t* srcPixels,
size_t srcRowBytes,
SkCanvas::Config8888 srcConfig,
int width,
int height) {
if (srcConfig == dstConfig) {
if (srcPixels == dstPixels) {
return;
}
if (dstRowBytes == srcRowBytes &&
4U * width == srcRowBytes) {
memcpy(dstPixels, srcPixels, srcRowBytes * height);
return;
} else {
intptr_t srcPix = reinterpret_cast<intptr_t>(srcPixels);
intptr_t dstPix = reinterpret_cast<intptr_t>(dstPixels);
for (int y = 0; y < height; ++y) {
srcPixels = reinterpret_cast<const uint32_t*>(srcPix);
dstPixels = reinterpret_cast<uint32_t*>(dstPix);
memcpy(dstPixels, srcPixels, 4 * width);
srcPix += srcRowBytes;
dstPix += dstRowBytes;
}
return;
}
}
switch(srcConfig) {
case SkCanvas::kNative_Premul_Config8888:
convert_config8888<SkCanvas::kNative_Premul_Config8888>(dstPixels, dstRowBytes, dstConfig, srcPixels, srcRowBytes, width, height);
break;
case SkCanvas::kNative_Unpremul_Config8888:
convert_config8888<SkCanvas::kNative_Unpremul_Config8888>(dstPixels, dstRowBytes, dstConfig, srcPixels, srcRowBytes, width, height);
break;
case SkCanvas::kBGRA_Premul_Config8888:
convert_config8888<SkCanvas::kBGRA_Premul_Config8888>(dstPixels, dstRowBytes, dstConfig, srcPixels, srcRowBytes, width, height);
break;
case SkCanvas::kBGRA_Unpremul_Config8888:
convert_config8888<SkCanvas::kBGRA_Unpremul_Config8888>(dstPixels, dstRowBytes, dstConfig, srcPixels, srcRowBytes, width, height);
break;
case SkCanvas::kRGBA_Premul_Config8888:
convert_config8888<SkCanvas::kRGBA_Premul_Config8888>(dstPixels, dstRowBytes, dstConfig, srcPixels, srcRowBytes, width, height);
break;
case SkCanvas::kRGBA_Unpremul_Config8888:
convert_config8888<SkCanvas::kRGBA_Unpremul_Config8888>(dstPixels, dstRowBytes, dstConfig, srcPixels, srcRowBytes, width, height);
break;
default:
SkDEBUGFAIL("Unexpected config8888");
break;
}
}
uint32_t SkPackConfig8888(SkCanvas::Config8888 config,
uint32_t a,
uint32_t r,
uint32_t g,
uint32_t b) {
switch (config) {
case SkCanvas::kNative_Premul_Config8888:
case SkCanvas::kNative_Unpremul_Config8888:
return pack_config8888<SK_NATIVE_A_IDX,
SK_NATIVE_R_IDX,
SK_NATIVE_G_IDX,
SK_NATIVE_B_IDX>(a, r, g, b);
case SkCanvas::kBGRA_Premul_Config8888:
case SkCanvas::kBGRA_Unpremul_Config8888:
return pack_config8888<3, 2, 1, 0>(a, r, g, b);
case SkCanvas::kRGBA_Premul_Config8888:
case SkCanvas::kRGBA_Unpremul_Config8888:
return pack_config8888<3, 0, 1, 2>(a, r, g, b);
default:
SkDEBUGFAIL("Unexpected config8888");
return 0;
}
}
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