reed@android.com | 8a1c16f | 2008-12-17 15:59:43 +0000 | [diff] [blame^] | 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 stack-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 | |