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| 1 /* libs/graphics/sgl/SkAntiRun.h | |
| 2 ** | |
| 3 ** Copyright 2006, The Android Open Source Project | |
| 4 ** | |
| 5 ** Licensed under the Apache License, Version 2.0 (the "License"); | |
| 6 ** you may not use this file except in compliance with the License. | |
| 7 ** You may obtain a copy of the License at | |
| 8 ** | |
| 9 ** http://www.apache.org/licenses/LICENSE-2.0 | |
| 10 ** | |
| 11 ** Unless required by applicable law or agreed to in writing, software | |
| 12 ** distributed under the License is distributed on an "AS IS" BASIS, | |
| 13 ** WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied. | |
| 14 ** See the License for the specific language governing permissions and | |
| 15 ** limitations under the License. | |
| 16 */ | |
| 17 | |
| 18 #ifndef SkAntiRun_DEFINED | |
| 19 #define SkAntiRun_DEFINED | |
| 20 | |
| 21 #include "SkBlitter.h" | |
| 22 | |
| 23 inline int sk_make_nonzero_neg_one(int x) | |
| 24 { | |
| 25 return (x | -x) >> 31; | |
| 26 } | |
| 27 | |
| 28 #if 0 | |
| 29 template <int kShift> class SkAntiRun { | |
| 30 static uint8_t coverage_to_alpha(int aa) | |
| 31 { | |
| 32 aa <<= 8 - 2*kShift; | |
| 33 aa -= aa >> (8 - kShift - 1); | |
| 34 return SkToU8(aa); | |
| 35 } | |
| 36 public: | |
| 37 void set(int start, int stop) | |
| 38 { | |
| 39 SkASSERT(start >= 0 && stop > start); | |
| 40 | |
| 41 #if 1 | |
| 42 int fb = start & kMask; | |
| 43 int fe = stop & kMask; | |
| 44 int n = (stop >> kShift) - (start >> kShift) - 1; | |
| 45 | |
| 46 if (n < 0) | |
| 47 { | |
| 48 fb = fe - fb; | |
| 49 n = 0; | |
| 50 fe = 0; | |
| 51 } | |
| 52 else | |
| 53 { | |
| 54 if (fb == 0) | |
| 55 n += 1; | |
| 56 else | |
| 57 fb = (1 << kShift) - fb; | |
| 58 } | |
| 59 | |
| 60 fStartAlpha = coverage_to_alpha(fb); | |
| 61 fMiddleCount = n; | |
| 62 fStopAlpha = coverage_to_alpha(fe); | |
| 63 #else | |
| 64 int x0 = start >> kShift; | |
| 65 int x1 = (stop - 1) >> kShift; | |
| 66 int middle = x1 - x0; | |
| 67 int aa; | |
| 68 | |
| 69 if (middle == 0) | |
| 70 { | |
| 71 aa = stop - start; | |
| 72 aa <<= 8 - 2*kShift; | |
| 73 aa -= aa >> (8 - kShift - 1); | |
| 74 SkASSERT(aa > 0 && aa < kMax); | |
| 75 fStartAlpha = SkToU8(aa); | |
| 76 fMiddleCount = 0; | |
| 77 fStopAlpha = 0; | |
| 78 } | |
| 79 else | |
| 80 { | |
| 81 int aa = start & kMask; | |
| 82 aa <<= 8 - 2*kShift; | |
| 83 aa -= aa >> (8 - kShift - 1); | |
| 84 SkASSERT(aa >= 0 && aa < kMax); | |
| 85 if (aa) | |
| 86 fStartAlpha = SkToU8(kMax - aa); | |
| 87 else | |
| 88 { | |
| 89 fStartAlpha = 0; | |
| 90 middle += 1; | |
| 91 } | |
| 92 aa = stop & kMask; | |
| 93 aa <<= 8 - 2*kShift; | |
| 94 aa -= aa >> (8 - kShift - 1); | |
| 95 SkASSERT(aa >= 0 && aa < kMax); | |
| 96 middle += sk_make_nonzero_neg_one(aa); | |
| 97 | |
| 98 fStopAlpha = SkToU8(aa); | |
| 99 fMiddleCount = middle; | |
| 100 } | |
| 101 SkASSERT(fStartAlpha < kMax); | |
| 102 SkASSERT(fStopAlpha < kMax); | |
| 103 #endif | |
| 104 } | |
| 105 | |
| 106 void blit(int x, int y, SkBlitter* blitter) | |
| 107 { | |
| 108 int16_t runs[2]; | |
| 109 runs[0] = 1; | |
| 110 runs[1] = 0; | |
| 111 | |
| 112 if (fStartAlpha) | |
| 113 { | |
| 114 blitter->blitAntiH(x, y, &fStartAlpha, runs); | |
| 115 x += 1; | |
| 116 } | |
| 117 if (fMiddleCount) | |
| 118 { | |
| 119 blitter->blitH(x, y, fMiddleCount); | |
| 120 x += fMiddleCount; | |
| 121 } | |
| 122 if (fStopAlpha) | |
| 123 blitter->blitAntiH(x, y, &fStopAlpha, runs); | |
| 124 } | |
| 125 | |
| 126 uint8_t getStartAlpha() const { return fStartAlpha; } | |
| 127 int getMiddleCount() const { return fMiddleCount; } | |
| 128 uint8_t getStopAlpha() const { return fStopAlpha; } | |
| 129 | |
| 130 private: | |
| 131 uint8_t fStartAlpha, fStopAlpha; | |
| 132 int fMiddleCount; | |
| 133 | |
| 134 enum { | |
| 135 kMask = (1 << kShift) - 1, | |
| 136 kMax = (1 << (8 - kShift)) - 1 | |
| 137 }; | |
| 138 }; | |
| 139 #endif | |
| 140 | |
| 141 ////////////////////////////////////////////////////////////////////////////////
//// | |
| 142 | |
| 143 class SkAlphaRuns { | |
| 144 public: | |
| 145 int16_t* fRuns; | |
| 146 uint8_t* fAlpha; | |
| 147 | |
| 148 bool empty() const | |
| 149 { | |
| 150 SkASSERT(fRuns[0] > 0); | |
| 151 return fAlpha[0] == 0 && fRuns[fRuns[0]] == 0; | |
| 152 } | |
| 153 void reset(int width); | |
| 154 void add(int x, U8CPU startAlpha, int middleCount, U8CPU stopAlpha, U8CPU
maxValue); | |
| 155 SkDEBUGCODE(void assertValid(int y, int maxStep) const;) | |
| 156 SkDEBUGCODE(void dump() const;) | |
| 157 | |
| 158 static void Break(int16_t runs[], uint8_t alpha[], int x, int count); | |
| 159 static void BreakAt(int16_t runs[], uint8_t alpha[], int x) | |
| 160 { | |
| 161 while (x > 0) | |
| 162 { | |
| 163 int n = runs[0]; | |
| 164 SkASSERT(n > 0); | |
| 165 | |
| 166 if (x < n) | |
| 167 { | |
| 168 alpha[x] = alpha[0]; | |
| 169 runs[0] = SkToS16(x); | |
| 170 runs[x] = SkToS16(n - x); | |
| 171 break; | |
| 172 } | |
| 173 runs += n; | |
| 174 alpha += n; | |
| 175 x -= n; | |
| 176 } | |
| 177 } | |
| 178 | |
| 179 private: | |
| 180 SkDEBUGCODE(int fWidth;) | |
| 181 SkDEBUGCODE(void validate() const;) | |
| 182 }; | |
| 183 | |
| 184 #endif | |
| 185 | |
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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/