| #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; |
| } |
| } |
