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gfx/skia/trunk/include/core/SkDither.h@129ffea94266 (annotated)

gfx/skia/trunk/include/core/SkDither.h

Sat, 03 Jan 2015 20:18:00 +0100

author
Michael Schloh von Bennewitz <michael@schloh.com>
date
Sat, 03 Jan 2015 20:18:00 +0100
branch
TOR_BUG_3246
changeset 7
129ffea94266
permissions
-rw-r--r--

Conditionally enable double key logic according to:
private browsing mode or privacy.thirdparty.isolate preference and
implement in GetCookieStringCommon and FindCookie where it counts...
With some reservations of how to convince FindCookie users to test
condition and pass a nullptr when disabling double key logic.

michael@0 1
michael@0 2 /*
michael@0 3 * Copyright 2008 The Android Open Source Project
michael@0 4 *
michael@0 5 * Use of this source code is governed by a BSD-style license that can be
michael@0 6 * found in the LICENSE file.
michael@0 7 */
michael@0 8
michael@0 9
michael@0 10 #ifndef SkDither_DEFINED
michael@0 11 #define SkDither_DEFINED
michael@0 12
michael@0 13 #include "SkColorPriv.h"
michael@0 14
michael@0 15 #define SK_DitherValueMax4444 15
michael@0 16 #define SK_DitherValueMax565 7
michael@0 17
michael@0 18 /* need to use macros for bit-counts for each component, and then
michael@0 19 move these into SkColorPriv.h
michael@0 20 */
michael@0 21
michael@0 22 #define SkDITHER_R32_FOR_565_MACRO(r, d) (r + d - (r >> 5))
michael@0 23 #define SkDITHER_G32_FOR_565_MACRO(g, d) (g + (d >> 1) - (g >> 6))
michael@0 24 #define SkDITHER_B32_FOR_565_MACRO(b, d) (b + d - (b >> 5))
michael@0 25
michael@0 26 #define SkDITHER_A32_FOR_4444_MACRO(a, d) (a + 15 - (a >> 4))
michael@0 27 #define SkDITHER_R32_FOR_4444_MACRO(r, d) (r + d - (r >> 4))
michael@0 28 #define SkDITHER_G32_FOR_4444_MACRO(g, d) (g + d - (g >> 4))
michael@0 29 #define SkDITHER_B32_FOR_4444_MACRO(b, d) (b + d - (b >> 4))
michael@0 30
michael@0 31 #ifdef SK_DEBUG
michael@0 32 inline unsigned SkDITHER_R32_FOR_565(unsigned r, unsigned d)
michael@0 33 {
michael@0 34 SkASSERT(d <= SK_DitherValueMax565);
michael@0 35 SkA32Assert(r);
michael@0 36 r = SkDITHER_R32_FOR_565_MACRO(r, d);
michael@0 37 SkA32Assert(r);
michael@0 38 return r;
michael@0 39 }
michael@0 40 inline unsigned SkDITHER_G32_FOR_565(unsigned g, unsigned d)
michael@0 41 {
michael@0 42 SkASSERT(d <= SK_DitherValueMax565);
michael@0 43 SkG32Assert(g);
michael@0 44 g = SkDITHER_G32_FOR_565_MACRO(g, d);
michael@0 45 SkG32Assert(g);
michael@0 46 return g;
michael@0 47 }
michael@0 48 inline unsigned SkDITHER_B32_FOR_565(unsigned b, unsigned d)
michael@0 49 {
michael@0 50 SkASSERT(d <= SK_DitherValueMax565);
michael@0 51 SkB32Assert(b);
michael@0 52 b = SkDITHER_B32_FOR_565_MACRO(b, d);
michael@0 53 SkB32Assert(b);
michael@0 54 return b;
michael@0 55 }
michael@0 56 #else
michael@0 57 #define SkDITHER_R32_FOR_565(r, d) SkDITHER_R32_FOR_565_MACRO(r, d)
michael@0 58 #define SkDITHER_G32_FOR_565(g, d) SkDITHER_G32_FOR_565_MACRO(g, d)
michael@0 59 #define SkDITHER_B32_FOR_565(b, d) SkDITHER_B32_FOR_565_MACRO(b, d)
michael@0 60 #endif
michael@0 61
michael@0 62 #define SkDITHER_R32To565(r, d) SkR32ToR16(SkDITHER_R32_FOR_565(r, d))
michael@0 63 #define SkDITHER_G32To565(g, d) SkG32ToG16(SkDITHER_G32_FOR_565(g, d))
michael@0 64 #define SkDITHER_B32To565(b, d) SkB32ToB16(SkDITHER_B32_FOR_565(b, d))
michael@0 65
michael@0 66 #define SkDITHER_A32To4444(a, d) SkA32To4444(SkDITHER_A32_FOR_4444_MACRO(a, d))
michael@0 67 #define SkDITHER_R32To4444(r, d) SkR32To4444(SkDITHER_R32_FOR_4444_MACRO(r, d))
michael@0 68 #define SkDITHER_G32To4444(g, d) SkG32To4444(SkDITHER_G32_FOR_4444_MACRO(g, d))
michael@0 69 #define SkDITHER_B32To4444(b, d) SkB32To4444(SkDITHER_B32_FOR_4444_MACRO(b, d))
michael@0 70
michael@0 71 static inline SkPMColor SkDitherARGB32For565(SkPMColor c, unsigned dither)
michael@0 72 {
michael@0 73 SkASSERT(dither <= SK_DitherValueMax565);
michael@0 74
michael@0 75 unsigned sa = SkGetPackedA32(c);
michael@0 76 dither = SkAlphaMul(dither, SkAlpha255To256(sa));
michael@0 77
michael@0 78 unsigned sr = SkGetPackedR32(c);
michael@0 79 unsigned sg = SkGetPackedG32(c);
michael@0 80 unsigned sb = SkGetPackedB32(c);
michael@0 81 sr = SkDITHER_R32_FOR_565(sr, dither);
michael@0 82 sg = SkDITHER_G32_FOR_565(sg, dither);
michael@0 83 sb = SkDITHER_B32_FOR_565(sb, dither);
michael@0 84
michael@0 85 return SkPackARGB32(sa, sr, sg, sb);
michael@0 86 }
michael@0 87
michael@0 88 static inline SkPMColor SkDitherRGB32For565(SkPMColor c, unsigned dither)
michael@0 89 {
michael@0 90 SkASSERT(dither <= SK_DitherValueMax565);
michael@0 91
michael@0 92 unsigned sr = SkGetPackedR32(c);
michael@0 93 unsigned sg = SkGetPackedG32(c);
michael@0 94 unsigned sb = SkGetPackedB32(c);
michael@0 95 sr = SkDITHER_R32_FOR_565(sr, dither);
michael@0 96 sg = SkDITHER_G32_FOR_565(sg, dither);
michael@0 97 sb = SkDITHER_B32_FOR_565(sb, dither);
michael@0 98
michael@0 99 return SkPackARGB32(0xFF, sr, sg, sb);
michael@0 100 }
michael@0 101
michael@0 102 static inline uint16_t SkDitherRGBTo565(U8CPU r, U8CPU g, U8CPU b,
michael@0 103 unsigned dither)
michael@0 104 {
michael@0 105 SkASSERT(dither <= SK_DitherValueMax565);
michael@0 106 r = SkDITHER_R32To565(r, dither);
michael@0 107 g = SkDITHER_G32To565(g, dither);
michael@0 108 b = SkDITHER_B32To565(b, dither);
michael@0 109 return SkPackRGB16(r, g, b);
michael@0 110 }
michael@0 111
michael@0 112 static inline uint16_t SkDitherRGB32To565(SkPMColor c, unsigned dither)
michael@0 113 {
michael@0 114 SkASSERT(dither <= SK_DitherValueMax565);
michael@0 115
michael@0 116 unsigned sr = SkGetPackedR32(c);
michael@0 117 unsigned sg = SkGetPackedG32(c);
michael@0 118 unsigned sb = SkGetPackedB32(c);
michael@0 119 sr = SkDITHER_R32To565(sr, dither);
michael@0 120 sg = SkDITHER_G32To565(sg, dither);
michael@0 121 sb = SkDITHER_B32To565(sb, dither);
michael@0 122
michael@0 123 return SkPackRGB16(sr, sg, sb);
michael@0 124 }
michael@0 125
michael@0 126 static inline uint16_t SkDitherARGB32To565(U8CPU sa, SkPMColor c, unsigned dither)
michael@0 127 {
michael@0 128 SkASSERT(dither <= SK_DitherValueMax565);
michael@0 129 dither = SkAlphaMul(dither, SkAlpha255To256(sa));
michael@0 130
michael@0 131 unsigned sr = SkGetPackedR32(c);
michael@0 132 unsigned sg = SkGetPackedG32(c);
michael@0 133 unsigned sb = SkGetPackedB32(c);
michael@0 134 sr = SkDITHER_R32To565(sr, dither);
michael@0 135 sg = SkDITHER_G32To565(sg, dither);
michael@0 136 sb = SkDITHER_B32To565(sb, dither);
michael@0 137
michael@0 138 return SkPackRGB16(sr, sg, sb);
michael@0 139 }
michael@0 140
michael@0 141 ///////////////////////// 4444
michael@0 142
michael@0 143 static inline SkPMColor16 SkDitherARGB32To4444(U8CPU a, U8CPU r, U8CPU g,
michael@0 144 U8CPU b, unsigned dither)
michael@0 145 {
michael@0 146 dither = SkAlphaMul(dither, SkAlpha255To256(a));
michael@0 147
michael@0 148 a = SkDITHER_A32To4444(a, dither);
michael@0 149 r = SkDITHER_R32To4444(r, dither);
michael@0 150 g = SkDITHER_G32To4444(g, dither);
michael@0 151 b = SkDITHER_B32To4444(b, dither);
michael@0 152
michael@0 153 return SkPackARGB4444(a, r, g, b);
michael@0 154 }
michael@0 155
michael@0 156 static inline SkPMColor16 SkDitherARGB32To4444(SkPMColor c, unsigned dither)
michael@0 157 {
michael@0 158 unsigned a = SkGetPackedA32(c);
michael@0 159 unsigned r = SkGetPackedR32(c);
michael@0 160 unsigned g = SkGetPackedG32(c);
michael@0 161 unsigned b = SkGetPackedB32(c);
michael@0 162
michael@0 163 dither = SkAlphaMul(dither, SkAlpha255To256(a));
michael@0 164
michael@0 165 a = SkDITHER_A32To4444(a, dither);
michael@0 166 r = SkDITHER_R32To4444(r, dither);
michael@0 167 g = SkDITHER_G32To4444(g, dither);
michael@0 168 b = SkDITHER_B32To4444(b, dither);
michael@0 169
michael@0 170 return SkPackARGB4444(a, r, g, b);
michael@0 171 }
michael@0 172
michael@0 173 // TODO: need dither routines for 565 -> 4444
michael@0 174
michael@0 175 // this toggles between a 4x4 and a 1x4 array
michael@0 176 //#define ENABLE_DITHER_MATRIX_4X4
michael@0 177
michael@0 178 #ifdef ENABLE_DITHER_MATRIX_4X4
michael@0 179 extern const uint8_t gDitherMatrix_4Bit_4X4[4][4];
michael@0 180 extern const uint8_t gDitherMatrix_3Bit_4X4[4][4];
michael@0 181
michael@0 182 #define DITHER_4444_SCAN(y) const uint8_t* dither_scan = gDitherMatrix_4Bit_4X4[(y) & 3]
michael@0 183 #define DITHER_565_SCAN(y) const uint8_t* dither_scan = gDitherMatrix_3Bit_4X4[(y) & 3]
michael@0 184
michael@0 185 #define DITHER_VALUE(x) dither_scan[(x) & 3]
michael@0 186 #else
michael@0 187 extern const uint16_t gDitherMatrix_4Bit_16[4];
michael@0 188 extern const uint16_t gDitherMatrix_3Bit_16[4];
michael@0 189
michael@0 190 #define DITHER_4444_SCAN(y) const uint16_t dither_scan = gDitherMatrix_4Bit_16[(y) & 3]
michael@0 191 #define DITHER_565_SCAN(y) const uint16_t dither_scan = gDitherMatrix_3Bit_16[(y) & 3]
michael@0 192
michael@0 193 #define DITHER_VALUE(x) ((dither_scan >> (((x) & 3) << 2)) & 0xF)
michael@0 194 #endif
michael@0 195
michael@0 196 #define DITHER_INC_X(x) ++(x)
michael@0 197
michael@0 198 #endif

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