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| 1 /* libs/graphics/sgl/SkShader.cpp | |
| 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 #include "SkShader.h" | |
| 19 #include "SkPaint.h" | |
| 20 | |
| 21 SkShader::SkShader() : fLocalMatrix(NULL) { | |
| 22 SkDEBUGCODE(fInSession = false;) | |
| 23 } | |
| 24 | |
| 25 SkShader::SkShader(SkFlattenableReadBuffer& buffer) | |
| 26 : INHERITED(buffer), fLocalMatrix(NULL) { | |
| 27 if (buffer.readBool()) { | |
| 28 SkMatrix matrix; | |
| 29 buffer.read(&matrix, sizeof(matrix)); | |
| 30 setLocalMatrix(matrix); | |
| 31 } | |
| 32 SkDEBUGCODE(fInSession = false;) | |
| 33 } | |
| 34 | |
| 35 SkShader::~SkShader() { | |
| 36 SkASSERT(!fInSession); | |
| 37 sk_free(fLocalMatrix); | |
| 38 } | |
| 39 | |
| 40 void SkShader::beginSession() { | |
| 41 SkASSERT(!fInSession); | |
| 42 SkDEBUGCODE(fInSession = true;) | |
| 43 } | |
| 44 | |
| 45 void SkShader::endSession() { | |
| 46 SkASSERT(fInSession); | |
| 47 SkDEBUGCODE(fInSession = false;) | |
| 48 } | |
| 49 | |
| 50 void SkShader::flatten(SkFlattenableWriteBuffer& buffer) { | |
| 51 this->INHERITED::flatten(buffer); | |
| 52 buffer.writeBool(fLocalMatrix != NULL); | |
| 53 if (fLocalMatrix) { | |
| 54 buffer.writeMul4(fLocalMatrix, sizeof(SkMatrix)); | |
| 55 } | |
| 56 } | |
| 57 | |
| 58 bool SkShader::getLocalMatrix(SkMatrix* localM) const { | |
| 59 if (fLocalMatrix) { | |
| 60 if (localM) { | |
| 61 *localM = *fLocalMatrix; | |
| 62 } | |
| 63 return true; | |
| 64 } else { | |
| 65 if (localM) { | |
| 66 localM->reset(); | |
| 67 } | |
| 68 return false; | |
| 69 } | |
| 70 } | |
| 71 | |
| 72 void SkShader::setLocalMatrix(const SkMatrix& localM) { | |
| 73 if (localM.isIdentity()) { | |
| 74 this->resetLocalMatrix(); | |
| 75 } else { | |
| 76 if (fLocalMatrix == NULL) { | |
| 77 fLocalMatrix = (SkMatrix*)sk_malloc_throw(sizeof(SkMatrix)); | |
| 78 } | |
| 79 *fLocalMatrix = localM; | |
| 80 } | |
| 81 } | |
| 82 | |
| 83 void SkShader::resetLocalMatrix() { | |
| 84 if (fLocalMatrix) { | |
| 85 sk_free(fLocalMatrix); | |
| 86 fLocalMatrix = NULL; | |
| 87 } | |
| 88 } | |
| 89 | |
| 90 bool SkShader::setContext(const SkBitmap& device, | |
| 91 const SkPaint& paint, | |
| 92 const SkMatrix& matrix) { | |
| 93 const SkMatrix* m = &matrix; | |
| 94 SkMatrix total; | |
| 95 | |
| 96 fDeviceConfig = SkToU8(device.getConfig()); | |
| 97 fPaintAlpha = paint.getAlpha(); | |
| 98 if (fLocalMatrix) { | |
| 99 total.setConcat(matrix, *fLocalMatrix); | |
| 100 m = &total; | |
| 101 } | |
| 102 if (m->invert(&fTotalInverse)) { | |
| 103 fTotalInverseClass = (uint8_t)ComputeMatrixClass(fTotalInverse); | |
| 104 return true; | |
| 105 } | |
| 106 return false; | |
| 107 } | |
| 108 | |
| 109 #include "SkColorPriv.h" | |
| 110 | |
| 111 void SkShader::shadeSpan16(int x, int y, uint16_t span16[], int count) { | |
| 112 SkASSERT(span16); | |
| 113 SkASSERT(count > 0); | |
| 114 SkASSERT(this->canCallShadeSpan16()); | |
| 115 | |
| 116 // basically, if we get here, the subclass screwed up | |
| 117 SkASSERT(!"kHasSpan16 flag is set, but shadeSpan16() not implemented"); | |
| 118 } | |
| 119 | |
| 120 #define kTempColorQuadCount 6 // balance between speed (larger) and saving sta
ck-space | |
| 121 #define kTempColorCount (kTempColorQuadCount << 2) | |
| 122 | |
| 123 #ifdef SK_CPU_BENDIAN | |
| 124 #define SkU32BitShiftToByteOffset(shift) (3 - ((shift) >> 3)) | |
| 125 #else | |
| 126 #define SkU32BitShiftToByteOffset(shift) ((shift) >> 3) | |
| 127 #endif | |
| 128 | |
| 129 void SkShader::shadeSpanAlpha(int x, int y, uint8_t alpha[], int count) { | |
| 130 SkASSERT(count > 0); | |
| 131 | |
| 132 SkPMColor colors[kTempColorCount]; | |
| 133 | |
| 134 while ((count -= kTempColorCount) >= 0) { | |
| 135 this->shadeSpan(x, y, colors, kTempColorCount); | |
| 136 x += kTempColorCount; | |
| 137 | |
| 138 const uint8_t* srcA = (const uint8_t*)colors + SkU32BitShiftToByteOffset
(SK_A32_SHIFT); | |
| 139 int quads = kTempColorQuadCount; | |
| 140 do { | |
| 141 U8CPU a0 = srcA[0]; | |
| 142 U8CPU a1 = srcA[4]; | |
| 143 U8CPU a2 = srcA[8]; | |
| 144 U8CPU a3 = srcA[12]; | |
| 145 srcA += 4*4; | |
| 146 *alpha++ = SkToU8(a0); | |
| 147 *alpha++ = SkToU8(a1); | |
| 148 *alpha++ = SkToU8(a2); | |
| 149 *alpha++ = SkToU8(a3); | |
| 150 } while (--quads != 0); | |
| 151 } | |
| 152 SkASSERT(count < 0); | |
| 153 SkASSERT(count + kTempColorCount >= 0); | |
| 154 if (count += kTempColorCount) { | |
| 155 this->shadeSpan(x, y, colors, count); | |
| 156 | |
| 157 const uint8_t* srcA = (const uint8_t*)colors + SkU32BitShiftToByteOffset
(SK_A32_SHIFT); | |
| 158 do { | |
| 159 *alpha++ = *srcA; | |
| 160 srcA += 4; | |
| 161 } while (--count != 0); | |
| 162 } | |
| 163 #if 0 | |
| 164 do { | |
| 165 int n = count; | |
| 166 if (n > kTempColorCount) | |
| 167 n = kTempColorCount; | |
| 168 SkASSERT(n > 0); | |
| 169 | |
| 170 this->shadeSpan(x, y, colors, n); | |
| 171 x += n; | |
| 172 count -= n; | |
| 173 | |
| 174 const uint8_t* srcA = (const uint8_t*)colors + SkU32BitShiftToByteOffset
(SK_A32_SHIFT); | |
| 175 do { | |
| 176 *alpha++ = *srcA; | |
| 177 srcA += 4; | |
| 178 } while (--n != 0); | |
| 179 } while (count > 0); | |
| 180 #endif | |
| 181 } | |
| 182 | |
| 183 SkShader::MatrixClass SkShader::ComputeMatrixClass(const SkMatrix& mat) { | |
| 184 MatrixClass mc = kLinear_MatrixClass; | |
| 185 | |
| 186 if (mat.getType() & SkMatrix::kPerspective_Mask) { | |
| 187 if (mat.fixedStepInX(0, NULL, NULL)) { | |
| 188 mc = kFixedStepInX_MatrixClass; | |
| 189 } else { | |
| 190 mc = kPerspective_MatrixClass; | |
| 191 } | |
| 192 } | |
| 193 return mc; | |
| 194 } | |
| 195 | |
| 196 ////////////////////////////////////////////////////////////////////////////// | |
| 197 | |
| 198 bool SkShader::asABitmap(SkBitmap*, SkMatrix*, TileMode*) { | |
| 199 return false; | |
| 200 } | |
| 201 | |
| 202 SkShader* SkShader::CreateBitmapShader(const SkBitmap& src, | |
| 203 TileMode tmx, TileMode tmy) { | |
| 204 return SkShader::CreateBitmapShader(src, tmx, tmy, NULL, 0); | |
| 205 } | |
| 206 | |
| 207 ////////////////////////////////////////////////////////////////////////////// | |
| 208 | |
| 209 #include "SkColorShader.h" | |
| 210 #include "SkUtils.h" | |
| 211 | |
| 212 SkColorShader::SkColorShader(SkFlattenableReadBuffer& b) : INHERITED(b) { | |
| 213 fInheritColor = b.readU8(); | |
| 214 if (fInheritColor) { | |
| 215 return; | |
| 216 } | |
| 217 fColor = b.readU32(); | |
| 218 } | |
| 219 | |
| 220 void SkColorShader::flatten(SkFlattenableWriteBuffer& buffer) { | |
| 221 this->INHERITED::flatten(buffer); | |
| 222 buffer.write8(fInheritColor); | |
| 223 if (fInheritColor) { | |
| 224 return; | |
| 225 } | |
| 226 buffer.write32(fColor); | |
| 227 } | |
| 228 | |
| 229 uint32_t SkColorShader::getFlags() { | |
| 230 return (SkGetPackedA32(fPMColor) == 255 ? kOpaqueAlpha_Flag : 0) | | |
| 231 kHasSpan16_Flag; | |
| 232 } | |
| 233 | |
| 234 uint8_t SkColorShader::getSpan16Alpha() const { | |
| 235 return SkGetPackedA32(fPMColor); | |
| 236 } | |
| 237 | |
| 238 bool SkColorShader::setContext(const SkBitmap& device, const SkPaint& paint, | |
| 239 const SkMatrix& matrix) { | |
| 240 if (!this->INHERITED::setContext(device, paint, matrix)) { | |
| 241 return false; | |
| 242 } | |
| 243 | |
| 244 SkColor c; | |
| 245 unsigned a; | |
| 246 | |
| 247 if (fInheritColor) { | |
| 248 c = paint.getColor(); | |
| 249 a = SkColorGetA(c); | |
| 250 } else { | |
| 251 c = fColor; | |
| 252 a = SkAlphaMul(SkColorGetA(c), SkAlpha255To256(paint.getAlpha())); | |
| 253 } | |
| 254 | |
| 255 unsigned r = SkColorGetR(c); | |
| 256 unsigned g = SkColorGetG(c); | |
| 257 unsigned b = SkColorGetB(c); | |
| 258 | |
| 259 // we want this before we apply any alpha | |
| 260 fColor16 = SkPack888ToRGB16(r, g, b); | |
| 261 | |
| 262 if (a != 255) { | |
| 263 a = SkAlpha255To256(a); | |
| 264 r = SkAlphaMul(r, a); | |
| 265 g = SkAlphaMul(g, a); | |
| 266 b = SkAlphaMul(b, a); | |
| 267 } | |
| 268 fPMColor = SkPackARGB32(a, r, g, b); | |
| 269 | |
| 270 return true; | |
| 271 } | |
| 272 | |
| 273 void SkColorShader::shadeSpan(int x, int y, SkPMColor span[], int count) { | |
| 274 sk_memset32(span, fPMColor, count); | |
| 275 } | |
| 276 | |
| 277 void SkColorShader::shadeSpan16(int x, int y, uint16_t span[], int count) { | |
| 278 sk_memset16(span, fColor16, count); | |
| 279 } | |
| 280 | |
| 281 void SkColorShader::shadeSpanAlpha(int x, int y, uint8_t alpha[], int count) { | |
| 282 memset(alpha, SkGetPackedA32(fPMColor), count); | |
| 283 } | |
| 284 | |
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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/