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| 1 #include "SkFontHost.h" | |
| 2 #include <math.h> | |
| 3 | |
| 4 // define this to use pre-compiled tables for gamma. This is slightly faster, | |
| 5 // and doesn't create any RW global memory, but means we cannot change the | |
| 6 // gamma at runtime. | |
| 7 #define USE_PREDEFINED_GAMMA_TABLES | |
| 8 | |
| 9 #ifndef USE_PREDEFINED_GAMMA_TABLES | |
| 10 // define this if you want to spew out the "C" code for the tables, given | |
| 11 // the current values for SK_BLACK_GAMMA and SK_WHITE_GAMMA. | |
| 12 #define DUMP_GAMMA_TABLESx | |
| 13 #endif | |
| 14 | |
| 15 /////////////////////////////////////////////////////////////////////////////// | |
| 16 | |
| 17 #ifdef USE_PREDEFINED_GAMMA_TABLES | |
| 18 | |
| 19 #include "sk_predefined_gamma.h" | |
| 20 | |
| 21 #else // use writable globals for gamma tables | |
| 22 | |
| 23 static bool gGammaIsBuilt; | |
| 24 static uint8_t gBlackGamma[256], gWhiteGamma[256]; | |
| 25 | |
| 26 #define SK_BLACK_GAMMA (1.4f) | |
| 27 #define SK_WHITE_GAMMA (1/1.4f) | |
| 28 | |
| 29 static void build_power_table(uint8_t table[], float ee) | |
| 30 { | |
| 31 // printf("------ build_power_table %g\n", ee); | |
| 32 for (int i = 0; i < 256; i++) | |
| 33 { | |
| 34 float x = i / 255.f; | |
| 35 // printf(" %d %g", i, x); | |
| 36 x = powf(x, ee); | |
| 37 // printf(" %g", x); | |
| 38 int xx = SkScalarRound(SkFloatToScalar(x * 255)); | |
| 39 // printf(" %d\n", xx); | |
| 40 table[i] = SkToU8(xx); | |
| 41 } | |
| 42 } | |
| 43 | |
| 44 #ifdef DUMP_GAMMA_TABLES | |
| 45 | |
| 46 #include "SkString.h" | |
| 47 | |
| 48 static void dump_a_table(const char name[], const uint8_t table[], | |
| 49 float gamma) { | |
| 50 SkDebugf("\n"); | |
| 51 SkDebugf("\/\/ Gamma table for %g\n", gamma); | |
| 52 SkDebugf("static const uint8_t %s[] = {\n", name); | |
| 53 for (int y = 0; y < 16; y++) { | |
| 54 SkString line, tmp; | |
| 55 for (int x = 0; x < 16; x++) { | |
| 56 tmp.printf("0x%02X, ", *table++); | |
| 57 line.append(tmp); | |
| 58 } | |
| 59 SkDebugf(" %s\n", line.c_str()); | |
| 60 } | |
| 61 SkDebugf("};\n"); | |
| 62 } | |
| 63 | |
| 64 #endif | |
| 65 | |
| 66 #endif | |
| 67 | |
| 68 /////////////////////////////////////////////////////////////////////////////// | |
| 69 | |
| 70 void SkFontHost::GetGammaTables(const uint8_t* tables[2]) | |
| 71 { | |
| 72 #ifndef USE_PREDEFINED_GAMMA_TABLES | |
| 73 if (!gGammaIsBuilt) | |
| 74 { | |
| 75 build_power_table(gBlackGamma, SK_BLACK_GAMMA); | |
| 76 build_power_table(gWhiteGamma, SK_WHITE_GAMMA); | |
| 77 gGammaIsBuilt = true; | |
| 78 | |
| 79 #ifdef DUMP_GAMMA_TABLES | |
| 80 dump_a_table("gBlackGamma", gBlackGamma, SK_BLACK_GAMMA); | |
| 81 dump_a_table("gWhiteGamma", gWhiteGamma, SK_WHITE_GAMMA); | |
| 82 #endif | |
| 83 } | |
| 84 #endif | |
| 85 tables[0] = gBlackGamma; | |
| 86 tables[1] = gWhiteGamma; | |
| 87 } | |
| 88 | |
| 89 // If the luminance is <= this value, then apply the black gamma table | |
| 90 #define BLACK_GAMMA_THRESHOLD 0x40 | |
| 91 | |
| 92 // If the luminance is >= this value, then apply the white gamma table | |
| 93 #define WHITE_GAMMA_THRESHOLD 0xC0 | |
| 94 | |
| 95 int SkFontHost::ComputeGammaFlag(const SkPaint& paint) | |
| 96 { | |
| 97 if (paint.getShader() == NULL) | |
| 98 { | |
| 99 SkColor c = paint.getColor(); | |
| 100 int r = SkColorGetR(c); | |
| 101 int g = SkColorGetG(c); | |
| 102 int b = SkColorGetB(c); | |
| 103 int luminance = (r * 2 + g * 5 + b) >> 3; | |
| 104 | |
| 105 if (luminance <= BLACK_GAMMA_THRESHOLD) | |
| 106 { | |
| 107 // printf("------ black gamma for [%d %d %d]\n", r, g, b); | |
| 108 return SkScalerContext::kGammaForBlack_Flag; | |
| 109 } | |
| 110 if (luminance >= WHITE_GAMMA_THRESHOLD) | |
| 111 { | |
| 112 // printf("------ white gamma for [%d %d %d]\n", r, g, b); | |
| 113 return SkScalerContext::kGammaForWhite_Flag; | |
| 114 } | |
| 115 } | |
| 116 return 0; | |
| 117 } | |
| 118 | |
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Chromium Code Reviews
Issue 113827:
Remove the remainder of the skia source code from the Chromium repo.... (Closed)
Base URL: svn://chrome-svn/chrome/trunk/src/