1.1 --- /dev/null Thu Jan 01 00:00:00 1970 +0000
1.2 +++ b/gfx/skia/trunk/src/core/SkConfig8888.cpp Wed Dec 31 06:09:35 2014 +0100
1.3 @@ -0,0 +1,280 @@
1.4 +#include "SkConfig8888.h"
1.5 +#include "SkMathPriv.h"
1.6 +#include "SkUnPreMultiply.h"
1.7 +
1.8 +namespace {
1.9 +
1.10 +template <int A_IDX, int R_IDX, int G_IDX, int B_IDX>
1.11 +inline uint32_t pack_config8888(uint32_t a, uint32_t r,
1.12 + uint32_t g, uint32_t b) {
1.13 +#ifdef SK_CPU_LENDIAN
1.14 + return (a << (A_IDX * 8)) | (r << (R_IDX * 8)) |
1.15 + (g << (G_IDX * 8)) | (b << (B_IDX * 8));
1.16 +#else
1.17 + return (a << ((3-A_IDX) * 8)) | (r << ((3-R_IDX) * 8)) |
1.18 + (g << ((3-G_IDX) * 8)) | (b << ((3-B_IDX) * 8));
1.19 +#endif
1.20 +}
1.21 +
1.22 +template <int A_IDX, int R_IDX, int G_IDX, int B_IDX>
1.23 +inline void unpack_config8888(uint32_t color,
1.24 + uint32_t* a, uint32_t* r,
1.25 + uint32_t* g, uint32_t* b) {
1.26 +#ifdef SK_CPU_LENDIAN
1.27 + *a = (color >> (A_IDX * 8)) & 0xff;
1.28 + *r = (color >> (R_IDX * 8)) & 0xff;
1.29 + *g = (color >> (G_IDX * 8)) & 0xff;
1.30 + *b = (color >> (B_IDX * 8)) & 0xff;
1.31 +#else
1.32 + *a = (color >> ((3 - A_IDX) * 8)) & 0xff;
1.33 + *r = (color >> ((3 - R_IDX) * 8)) & 0xff;
1.34 + *g = (color >> ((3 - G_IDX) * 8)) & 0xff;
1.35 + *b = (color >> ((3 - B_IDX) * 8)) & 0xff;
1.36 +#endif
1.37 +}
1.38 +
1.39 +#ifdef SK_CPU_LENDIAN
1.40 + static const int SK_NATIVE_A_IDX = SK_A32_SHIFT / 8;
1.41 + static const int SK_NATIVE_R_IDX = SK_R32_SHIFT / 8;
1.42 + static const int SK_NATIVE_G_IDX = SK_G32_SHIFT / 8;
1.43 + static const int SK_NATIVE_B_IDX = SK_B32_SHIFT / 8;
1.44 +#else
1.45 + static const int SK_NATIVE_A_IDX = 3 - (SK_A32_SHIFT / 8);
1.46 + static const int SK_NATIVE_R_IDX = 3 - (SK_R32_SHIFT / 8);
1.47 + static const int SK_NATIVE_G_IDX = 3 - (SK_G32_SHIFT / 8);
1.48 + static const int SK_NATIVE_B_IDX = 3 - (SK_B32_SHIFT / 8);
1.49 +#endif
1.50 +
1.51 +/**
1.52 + * convert_pixel<OUT_CFG, IN_CFG converts a pixel value from one Config8888 to
1.53 + * another. It is implemented by first expanding OUT_CFG to r, g, b, a indices
1.54 + * and an is_premul bool as params to another template function. Then IN_CFG is
1.55 + * expanded via another function call.
1.56 + */
1.57 +
1.58 +template <bool OUT_PM, int OUT_A_IDX, int OUT_R_IDX, int OUT_G_IDX, int OUT_B_IDX,
1.59 + bool IN_PM, int IN_A_IDX, int IN_R_IDX, int IN_G_IDX, int IN_B_IDX>
1.60 +inline uint32_t convert_pixel(uint32_t pixel) {
1.61 + uint32_t a, r, g, b;
1.62 + unpack_config8888<IN_A_IDX, IN_R_IDX, IN_G_IDX, IN_B_IDX>(pixel, &a, &r, &g, &b);
1.63 + if (IN_PM && !OUT_PM) {
1.64 + // Using SkUnPreMultiply::ApplyScale is faster than (value * 0xff) / a.
1.65 + if (a) {
1.66 + SkUnPreMultiply::Scale scale = SkUnPreMultiply::GetScale(a);
1.67 + r = SkUnPreMultiply::ApplyScale(scale, r);
1.68 + g = SkUnPreMultiply::ApplyScale(scale, g);
1.69 + b = SkUnPreMultiply::ApplyScale(scale, b);
1.70 + } else {
1.71 + return 0;
1.72 + }
1.73 + } else if (!IN_PM && OUT_PM) {
1.74 + // This matches SkUnPreMultiply conversion which we are replacing.
1.75 + r = SkMulDiv255Round(r, a);
1.76 + g = SkMulDiv255Round(g, a);
1.77 + b = SkMulDiv255Round(b, a);
1.78 + }
1.79 + return pack_config8888<OUT_A_IDX, OUT_R_IDX, OUT_G_IDX, OUT_B_IDX>(a, r, g, b);
1.80 +}
1.81 +
1.82 +template <bool OUT_PM, int OUT_A_IDX, int OUT_R_IDX, int OUT_G_IDX, int OUT_B_IDX, SkCanvas::Config8888 IN_CFG>
1.83 +inline uint32_t convert_pixel(uint32_t pixel) {
1.84 + switch(IN_CFG) {
1.85 + case SkCanvas::kNative_Premul_Config8888:
1.86 + return convert_pixel<OUT_PM, OUT_A_IDX, OUT_R_IDX, OUT_G_IDX, OUT_B_IDX,
1.87 + true, SK_NATIVE_A_IDX, SK_NATIVE_R_IDX, SK_NATIVE_G_IDX, SK_NATIVE_B_IDX>(pixel);
1.88 + break;
1.89 + case SkCanvas::kNative_Unpremul_Config8888:
1.90 + return convert_pixel<OUT_PM, OUT_A_IDX, OUT_R_IDX, OUT_G_IDX, OUT_B_IDX,
1.91 + false, SK_NATIVE_A_IDX, SK_NATIVE_R_IDX, SK_NATIVE_G_IDX, SK_NATIVE_B_IDX>(pixel);
1.92 + break;
1.93 + case SkCanvas::kBGRA_Premul_Config8888:
1.94 + return convert_pixel<OUT_PM, OUT_A_IDX, OUT_R_IDX, OUT_G_IDX, OUT_B_IDX,
1.95 + true, 3, 2, 1, 0>(pixel);
1.96 + break;
1.97 + case SkCanvas::kBGRA_Unpremul_Config8888:
1.98 + return convert_pixel<OUT_PM, OUT_A_IDX, OUT_R_IDX, OUT_G_IDX, OUT_B_IDX,
1.99 + false, 3, 2, 1, 0>(pixel);
1.100 + break;
1.101 + case SkCanvas::kRGBA_Premul_Config8888:
1.102 + return convert_pixel<OUT_PM, OUT_A_IDX, OUT_R_IDX, OUT_G_IDX, OUT_B_IDX,
1.103 + true, 3, 0, 1, 2>(pixel);
1.104 + break;
1.105 + case SkCanvas::kRGBA_Unpremul_Config8888:
1.106 + return convert_pixel<OUT_PM, OUT_A_IDX, OUT_R_IDX, OUT_G_IDX, OUT_B_IDX,
1.107 + false, 3, 0, 1, 2>(pixel);
1.108 + break;
1.109 + default:
1.110 + SkDEBUGFAIL("Unexpected config8888");
1.111 + return 0;
1.112 + break;
1.113 + }
1.114 +}
1.115 +
1.116 +template <SkCanvas::Config8888 OUT_CFG, SkCanvas::Config8888 IN_CFG>
1.117 +inline uint32_t convert_pixel(uint32_t pixel) {
1.118 + switch(OUT_CFG) {
1.119 + case SkCanvas::kNative_Premul_Config8888:
1.120 + return convert_pixel<true, SK_NATIVE_A_IDX, SK_NATIVE_R_IDX, SK_NATIVE_G_IDX, SK_NATIVE_B_IDX, IN_CFG>(pixel);
1.121 + break;
1.122 + case SkCanvas::kNative_Unpremul_Config8888:
1.123 + return convert_pixel<false, SK_NATIVE_A_IDX, SK_NATIVE_R_IDX, SK_NATIVE_G_IDX, SK_NATIVE_B_IDX, IN_CFG>(pixel);
1.124 + break;
1.125 + case SkCanvas::kBGRA_Premul_Config8888:
1.126 + return convert_pixel<true, 3, 2, 1, 0, IN_CFG>(pixel);
1.127 + break;
1.128 + case SkCanvas::kBGRA_Unpremul_Config8888:
1.129 + return convert_pixel<false, 3, 2, 1, 0, IN_CFG>(pixel);
1.130 + break;
1.131 + case SkCanvas::kRGBA_Premul_Config8888:
1.132 + return convert_pixel<true, 3, 0, 1, 2, IN_CFG>(pixel);
1.133 + break;
1.134 + case SkCanvas::kRGBA_Unpremul_Config8888:
1.135 + return convert_pixel<false, 3, 0, 1, 2, IN_CFG>(pixel);
1.136 + break;
1.137 + default:
1.138 + SkDEBUGFAIL("Unexpected config8888");
1.139 + return 0;
1.140 + break;
1.141 + }
1.142 +}
1.143 +
1.144 +/**
1.145 + * SkConvertConfig8888Pixels has 6 * 6 possible combinations of src and dst
1.146 + * configs. Each is implemented as an instantiation templated function. Two
1.147 + * levels of switch statements are used to select the correct instantiation, one
1.148 + * for the src config and one for the dst config.
1.149 + */
1.150 +
1.151 +template <SkCanvas::Config8888 DST_CFG, SkCanvas::Config8888 SRC_CFG>
1.152 +inline void convert_config8888(uint32_t* dstPixels,
1.153 + size_t dstRowBytes,
1.154 + const uint32_t* srcPixels,
1.155 + size_t srcRowBytes,
1.156 + int width,
1.157 + int height) {
1.158 + intptr_t dstPix = reinterpret_cast<intptr_t>(dstPixels);
1.159 + intptr_t srcPix = reinterpret_cast<intptr_t>(srcPixels);
1.160 +
1.161 + for (int y = 0; y < height; ++y) {
1.162 + srcPixels = reinterpret_cast<const uint32_t*>(srcPix);
1.163 + dstPixels = reinterpret_cast<uint32_t*>(dstPix);
1.164 + for (int x = 0; x < width; ++x) {
1.165 + dstPixels[x] = convert_pixel<DST_CFG, SRC_CFG>(srcPixels[x]);
1.166 + }
1.167 + dstPix += dstRowBytes;
1.168 + srcPix += srcRowBytes;
1.169 + }
1.170 +}
1.171 +
1.172 +template <SkCanvas::Config8888 SRC_CFG>
1.173 +inline void convert_config8888(uint32_t* dstPixels,
1.174 + size_t dstRowBytes,
1.175 + SkCanvas::Config8888 dstConfig,
1.176 + const uint32_t* srcPixels,
1.177 + size_t srcRowBytes,
1.178 + int width,
1.179 + int height) {
1.180 + switch(dstConfig) {
1.181 + case SkCanvas::kNative_Premul_Config8888:
1.182 + convert_config8888<SkCanvas::kNative_Premul_Config8888, SRC_CFG>(dstPixels, dstRowBytes, srcPixels, srcRowBytes, width, height);
1.183 + break;
1.184 + case SkCanvas::kNative_Unpremul_Config8888:
1.185 + convert_config8888<SkCanvas::kNative_Unpremul_Config8888, SRC_CFG>(dstPixels, dstRowBytes, srcPixels, srcRowBytes, width, height);
1.186 + break;
1.187 + case SkCanvas::kBGRA_Premul_Config8888:
1.188 + convert_config8888<SkCanvas::kBGRA_Premul_Config8888, SRC_CFG>(dstPixels, dstRowBytes, srcPixels, srcRowBytes, width, height);
1.189 + break;
1.190 + case SkCanvas::kBGRA_Unpremul_Config8888:
1.191 + convert_config8888<SkCanvas::kBGRA_Unpremul_Config8888, SRC_CFG>(dstPixels, dstRowBytes, srcPixels, srcRowBytes, width, height);
1.192 + break;
1.193 + case SkCanvas::kRGBA_Premul_Config8888:
1.194 + convert_config8888<SkCanvas::kRGBA_Premul_Config8888, SRC_CFG>(dstPixels, dstRowBytes, srcPixels, srcRowBytes, width, height);
1.195 + break;
1.196 + case SkCanvas::kRGBA_Unpremul_Config8888:
1.197 + convert_config8888<SkCanvas::kRGBA_Unpremul_Config8888, SRC_CFG>(dstPixels, dstRowBytes, srcPixels, srcRowBytes, width, height);
1.198 + break;
1.199 + default:
1.200 + SkDEBUGFAIL("Unexpected config8888");
1.201 + break;
1.202 + }
1.203 +}
1.204 +
1.205 +}
1.206 +
1.207 +void SkConvertConfig8888Pixels(uint32_t* dstPixels,
1.208 + size_t dstRowBytes,
1.209 + SkCanvas::Config8888 dstConfig,
1.210 + const uint32_t* srcPixels,
1.211 + size_t srcRowBytes,
1.212 + SkCanvas::Config8888 srcConfig,
1.213 + int width,
1.214 + int height) {
1.215 + if (srcConfig == dstConfig) {
1.216 + if (srcPixels == dstPixels) {
1.217 + return;
1.218 + }
1.219 + if (dstRowBytes == srcRowBytes &&
1.220 + 4U * width == srcRowBytes) {
1.221 + memcpy(dstPixels, srcPixels, srcRowBytes * height);
1.222 + return;
1.223 + } else {
1.224 + intptr_t srcPix = reinterpret_cast<intptr_t>(srcPixels);
1.225 + intptr_t dstPix = reinterpret_cast<intptr_t>(dstPixels);
1.226 + for (int y = 0; y < height; ++y) {
1.227 + srcPixels = reinterpret_cast<const uint32_t*>(srcPix);
1.228 + dstPixels = reinterpret_cast<uint32_t*>(dstPix);
1.229 + memcpy(dstPixels, srcPixels, 4 * width);
1.230 + srcPix += srcRowBytes;
1.231 + dstPix += dstRowBytes;
1.232 + }
1.233 + return;
1.234 + }
1.235 + }
1.236 + switch(srcConfig) {
1.237 + case SkCanvas::kNative_Premul_Config8888:
1.238 + convert_config8888<SkCanvas::kNative_Premul_Config8888>(dstPixels, dstRowBytes, dstConfig, srcPixels, srcRowBytes, width, height);
1.239 + break;
1.240 + case SkCanvas::kNative_Unpremul_Config8888:
1.241 + convert_config8888<SkCanvas::kNative_Unpremul_Config8888>(dstPixels, dstRowBytes, dstConfig, srcPixels, srcRowBytes, width, height);
1.242 + break;
1.243 + case SkCanvas::kBGRA_Premul_Config8888:
1.244 + convert_config8888<SkCanvas::kBGRA_Premul_Config8888>(dstPixels, dstRowBytes, dstConfig, srcPixels, srcRowBytes, width, height);
1.245 + break;
1.246 + case SkCanvas::kBGRA_Unpremul_Config8888:
1.247 + convert_config8888<SkCanvas::kBGRA_Unpremul_Config8888>(dstPixels, dstRowBytes, dstConfig, srcPixels, srcRowBytes, width, height);
1.248 + break;
1.249 + case SkCanvas::kRGBA_Premul_Config8888:
1.250 + convert_config8888<SkCanvas::kRGBA_Premul_Config8888>(dstPixels, dstRowBytes, dstConfig, srcPixels, srcRowBytes, width, height);
1.251 + break;
1.252 + case SkCanvas::kRGBA_Unpremul_Config8888:
1.253 + convert_config8888<SkCanvas::kRGBA_Unpremul_Config8888>(dstPixels, dstRowBytes, dstConfig, srcPixels, srcRowBytes, width, height);
1.254 + break;
1.255 + default:
1.256 + SkDEBUGFAIL("Unexpected config8888");
1.257 + break;
1.258 + }
1.259 +}
1.260 +
1.261 +uint32_t SkPackConfig8888(SkCanvas::Config8888 config,
1.262 + uint32_t a,
1.263 + uint32_t r,
1.264 + uint32_t g,
1.265 + uint32_t b) {
1.266 + switch (config) {
1.267 + case SkCanvas::kNative_Premul_Config8888:
1.268 + case SkCanvas::kNative_Unpremul_Config8888:
1.269 + return pack_config8888<SK_NATIVE_A_IDX,
1.270 + SK_NATIVE_R_IDX,
1.271 + SK_NATIVE_G_IDX,
1.272 + SK_NATIVE_B_IDX>(a, r, g, b);
1.273 + case SkCanvas::kBGRA_Premul_Config8888:
1.274 + case SkCanvas::kBGRA_Unpremul_Config8888:
1.275 + return pack_config8888<3, 2, 1, 0>(a, r, g, b);
1.276 + case SkCanvas::kRGBA_Premul_Config8888:
1.277 + case SkCanvas::kRGBA_Unpremul_Config8888:
1.278 + return pack_config8888<3, 0, 1, 2>(a, r, g, b);
1.279 + default:
1.280 + SkDEBUGFAIL("Unexpected config8888");
1.281 + return 0;
1.282 + }
1.283 +}
