reed@android.com | 8a1c16f | 2008-12-17 15:59:43 +0000 | [diff] [blame] | 1 | /* libs/graphics/effects/SkGradientShader.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 "SkGradientShader.h" |
| 19 | #include "SkColorPriv.h" |
reed@google.com | dc731fd | 2010-12-23 15:19:47 +0000 | [diff] [blame^] | 20 | #include "SkMallocPixelRef.h" |
reed@android.com | 8a1c16f | 2008-12-17 15:59:43 +0000 | [diff] [blame] | 21 | #include "SkUnitMapper.h" |
| 22 | #include "SkUtils.h" |
reed@google.com | dc731fd | 2010-12-23 15:19:47 +0000 | [diff] [blame^] | 23 | #include "SkTemplates.h" |
| 24 | #include "SkBitmapCache.h" |
reed@android.com | 8a1c16f | 2008-12-17 15:59:43 +0000 | [diff] [blame] | 25 | |
reed@android.com | 8a1c16f | 2008-12-17 15:59:43 +0000 | [diff] [blame] | 26 | /////////////////////////////////////////////////////////////////////////// |
| 27 | |
| 28 | typedef SkFixed (*TileProc)(SkFixed); |
| 29 | |
reed@android.com | 41bccf5 | 2009-04-03 13:33:51 +0000 | [diff] [blame] | 30 | static SkFixed clamp_tileproc(SkFixed x) { |
reed@android.com | 8a1c16f | 2008-12-17 15:59:43 +0000 | [diff] [blame] | 31 | return SkClampMax(x, 0xFFFF); |
| 32 | } |
| 33 | |
reed@android.com | 41bccf5 | 2009-04-03 13:33:51 +0000 | [diff] [blame] | 34 | static SkFixed repeat_tileproc(SkFixed x) { |
reed@android.com | 8a1c16f | 2008-12-17 15:59:43 +0000 | [diff] [blame] | 35 | return x & 0xFFFF; |
| 36 | } |
| 37 | |
reed@android.com | 41bccf5 | 2009-04-03 13:33:51 +0000 | [diff] [blame] | 38 | static inline SkFixed mirror_tileproc(SkFixed x) { |
reed@android.com | 8a1c16f | 2008-12-17 15:59:43 +0000 | [diff] [blame] | 39 | int s = x << 15 >> 31; |
| 40 | return (x ^ s) & 0xFFFF; |
| 41 | } |
| 42 | |
| 43 | static const TileProc gTileProcs[] = { |
| 44 | clamp_tileproc, |
| 45 | repeat_tileproc, |
| 46 | mirror_tileproc |
| 47 | }; |
| 48 | |
| 49 | ////////////////////////////////////////////////////////////////////////////// |
| 50 | |
reed@android.com | 200645d | 2009-12-14 16:41:57 +0000 | [diff] [blame] | 51 | static inline int repeat_bits(int x, const int bits) { |
| 52 | return x & ((1 << bits) - 1); |
reed@android.com | 8a1c16f | 2008-12-17 15:59:43 +0000 | [diff] [blame] | 53 | } |
| 54 | |
reed@android.com | 200645d | 2009-12-14 16:41:57 +0000 | [diff] [blame] | 55 | static inline int mirror_bits(int x, const int bits) { |
reed@android.com | 8a1c16f | 2008-12-17 15:59:43 +0000 | [diff] [blame] | 56 | #ifdef SK_CPU_HAS_CONDITIONAL_INSTR |
reed@android.com | 200645d | 2009-12-14 16:41:57 +0000 | [diff] [blame] | 57 | if (x & (1 << bits)) |
reed@android.com | 8a1c16f | 2008-12-17 15:59:43 +0000 | [diff] [blame] | 58 | x = ~x; |
reed@android.com | 200645d | 2009-12-14 16:41:57 +0000 | [diff] [blame] | 59 | return x & ((1 << bits) - 1); |
reed@android.com | 8a1c16f | 2008-12-17 15:59:43 +0000 | [diff] [blame] | 60 | #else |
reed@android.com | 200645d | 2009-12-14 16:41:57 +0000 | [diff] [blame] | 61 | int s = x << (31 - bits) >> 31; |
| 62 | return (x ^ s) & ((1 << bits) - 1); |
reed@android.com | 8a1c16f | 2008-12-17 15:59:43 +0000 | [diff] [blame] | 63 | #endif |
| 64 | } |
| 65 | |
reed@android.com | 41bccf5 | 2009-04-03 13:33:51 +0000 | [diff] [blame] | 66 | static inline int repeat_8bits(int x) { |
reed@android.com | 8a1c16f | 2008-12-17 15:59:43 +0000 | [diff] [blame] | 67 | return x & 0xFF; |
| 68 | } |
| 69 | |
reed@android.com | 41bccf5 | 2009-04-03 13:33:51 +0000 | [diff] [blame] | 70 | static inline int mirror_8bits(int x) { |
reed@android.com | 8a1c16f | 2008-12-17 15:59:43 +0000 | [diff] [blame] | 71 | #ifdef SK_CPU_HAS_CONDITIONAL_INSTR |
reed@android.com | 41bccf5 | 2009-04-03 13:33:51 +0000 | [diff] [blame] | 72 | if (x & 256) { |
reed@android.com | 8a1c16f | 2008-12-17 15:59:43 +0000 | [diff] [blame] | 73 | x = ~x; |
reed@android.com | 41bccf5 | 2009-04-03 13:33:51 +0000 | [diff] [blame] | 74 | } |
reed@android.com | 8a1c16f | 2008-12-17 15:59:43 +0000 | [diff] [blame] | 75 | return x & 255; |
| 76 | #else |
| 77 | int s = x << 23 >> 31; |
| 78 | return (x ^ s) & 0xFF; |
| 79 | #endif |
| 80 | } |
| 81 | |
| 82 | ////////////////////////////////////////////////////////////////////////////// |
| 83 | |
| 84 | class Gradient_Shader : public SkShader { |
| 85 | public: |
| 86 | Gradient_Shader(const SkColor colors[], const SkScalar pos[], |
reed@android.com | 41bccf5 | 2009-04-03 13:33:51 +0000 | [diff] [blame] | 87 | int colorCount, SkShader::TileMode mode, SkUnitMapper* mapper); |
reed@android.com | 8a1c16f | 2008-12-17 15:59:43 +0000 | [diff] [blame] | 88 | virtual ~Gradient_Shader(); |
| 89 | |
| 90 | // overrides |
| 91 | virtual bool setContext(const SkBitmap&, const SkPaint&, const SkMatrix&); |
| 92 | virtual uint32_t getFlags() { return fFlags; } |
| 93 | |
| 94 | protected: |
| 95 | Gradient_Shader(SkFlattenableReadBuffer& ); |
| 96 | SkUnitMapper* fMapper; |
| 97 | SkMatrix fPtsToUnit; // set by subclass |
| 98 | SkMatrix fDstToIndex; |
| 99 | SkMatrix::MapXYProc fDstToIndexProc; |
reed@android.com | 8a1c16f | 2008-12-17 15:59:43 +0000 | [diff] [blame] | 100 | TileMode fTileMode; |
| 101 | TileProc fTileProc; |
reed@android.com | 41bccf5 | 2009-04-03 13:33:51 +0000 | [diff] [blame] | 102 | int fColorCount; |
reed@android.com | 8a1c16f | 2008-12-17 15:59:43 +0000 | [diff] [blame] | 103 | uint8_t fDstToIndexClass; |
| 104 | uint8_t fFlags; |
| 105 | |
| 106 | struct Rec { |
| 107 | SkFixed fPos; // 0...1 |
| 108 | uint32_t fScale; // (1 << 24) / range |
| 109 | }; |
| 110 | Rec* fRecs; |
| 111 | |
| 112 | enum { |
reed@android.com | 512a876 | 2009-12-14 15:25:36 +0000 | [diff] [blame] | 113 | kCache16Bits = 8, // seems like enough for visual accuracy |
reed@android.com | 8a1c16f | 2008-12-17 15:59:43 +0000 | [diff] [blame] | 114 | kCache16Count = 1 << kCache16Bits, |
reed@android.com | 512a876 | 2009-12-14 15:25:36 +0000 | [diff] [blame] | 115 | kCache16Mask = kCache16Count - 1, |
| 116 | kCache16Shift = 16 - kCache16Bits, |
| 117 | |
reed@android.com | 8a1c16f | 2008-12-17 15:59:43 +0000 | [diff] [blame] | 118 | kCache32Bits = 8, // pretty much should always be 8 |
| 119 | kCache32Count = 1 << kCache32Bits |
| 120 | }; |
| 121 | virtual void flatten(SkFlattenableWriteBuffer& ); |
| 122 | const uint16_t* getCache16(); |
| 123 | const SkPMColor* getCache32(); |
| 124 | |
reed@google.com | dc731fd | 2010-12-23 15:19:47 +0000 | [diff] [blame^] | 125 | SkMallocPixelRef* fCache32PixelRef; |
| 126 | |
| 127 | void commonAsABitmap(SkBitmap*); |
reed@android.com | 9b46e77 | 2009-06-05 12:24:41 +0000 | [diff] [blame] | 128 | |
reed@android.com | 8a1c16f | 2008-12-17 15:59:43 +0000 | [diff] [blame] | 129 | private: |
| 130 | enum { |
| 131 | kColorStorageCount = 4, // more than this many colors, and we'll use sk_malloc for the space |
| 132 | |
reed@android.com | 1c12abe | 2009-07-02 15:01:02 +0000 | [diff] [blame] | 133 | kStorageSize = kColorStorageCount * (sizeof(SkColor) + sizeof(Rec)) |
reed@android.com | 8a1c16f | 2008-12-17 15:59:43 +0000 | [diff] [blame] | 134 | }; |
| 135 | SkColor fStorage[(kStorageSize + 3) >> 2]; |
| 136 | SkColor* fOrigColors; |
| 137 | |
| 138 | uint16_t* fCache16; // working ptr. If this is NULL, we need to recompute the cache values |
| 139 | SkPMColor* fCache32; // working ptr. If this is NULL, we need to recompute the cache values |
| 140 | |
| 141 | uint16_t* fCache16Storage; // storage for fCache16, allocated on demand |
reed@android.com | 8a1c16f | 2008-12-17 15:59:43 +0000 | [diff] [blame] | 142 | unsigned fCacheAlpha; // the alpha value we used when we computed the cache. larger than 8bits so we can store uninitialized value |
| 143 | |
reed@android.com | 512a876 | 2009-12-14 15:25:36 +0000 | [diff] [blame] | 144 | static void Build16bitCache(uint16_t[], SkColor c0, SkColor c1, int count); |
| 145 | |
reed@android.com | 8a1c16f | 2008-12-17 15:59:43 +0000 | [diff] [blame] | 146 | typedef SkShader INHERITED; |
| 147 | }; |
| 148 | |
reed@android.com | 41bccf5 | 2009-04-03 13:33:51 +0000 | [diff] [blame] | 149 | static inline unsigned scalarToU16(SkScalar x) { |
reed@android.com | 8a1c16f | 2008-12-17 15:59:43 +0000 | [diff] [blame] | 150 | SkASSERT(x >= 0 && x <= SK_Scalar1); |
| 151 | |
| 152 | #ifdef SK_SCALAR_IS_FLOAT |
| 153 | return (unsigned)(x * 0xFFFF); |
| 154 | #else |
| 155 | return x - (x >> 16); // probably should be x - (x > 0x7FFF) but that is slower |
| 156 | #endif |
| 157 | } |
| 158 | |
reed@android.com | 41bccf5 | 2009-04-03 13:33:51 +0000 | [diff] [blame] | 159 | Gradient_Shader::Gradient_Shader(const SkColor colors[], const SkScalar pos[], |
| 160 | int colorCount, SkShader::TileMode mode, SkUnitMapper* mapper) { |
reed@android.com | 8a1c16f | 2008-12-17 15:59:43 +0000 | [diff] [blame] | 161 | SkASSERT(colorCount > 1); |
| 162 | |
| 163 | fCacheAlpha = 256; // init to a value that paint.getAlpha() can't return |
| 164 | |
| 165 | fMapper = mapper; |
| 166 | mapper->safeRef(); |
| 167 | |
reed@android.com | 8a1c16f | 2008-12-17 15:59:43 +0000 | [diff] [blame] | 168 | SkASSERT((unsigned)mode < SkShader::kTileModeCount); |
| 169 | SkASSERT(SkShader::kTileModeCount == SK_ARRAY_COUNT(gTileProcs)); |
| 170 | fTileMode = mode; |
| 171 | fTileProc = gTileProcs[mode]; |
reed@android.com | 41bccf5 | 2009-04-03 13:33:51 +0000 | [diff] [blame] | 172 | |
| 173 | fCache16 = fCache16Storage = NULL; |
reed@google.com | dc731fd | 2010-12-23 15:19:47 +0000 | [diff] [blame^] | 174 | fCache32 = NULL; |
| 175 | fCache32PixelRef = NULL; |
reed@android.com | 8a1c16f | 2008-12-17 15:59:43 +0000 | [diff] [blame] | 176 | |
reed@android.com | 41bccf5 | 2009-04-03 13:33:51 +0000 | [diff] [blame] | 177 | /* Note: we let the caller skip the first and/or last position. |
| 178 | i.e. pos[0] = 0.3, pos[1] = 0.7 |
| 179 | In these cases, we insert dummy entries to ensure that the final data |
| 180 | will be bracketed by [0, 1]. |
| 181 | i.e. our_pos[0] = 0, our_pos[1] = 0.3, our_pos[2] = 0.7, our_pos[3] = 1 |
| 182 | |
| 183 | Thus colorCount (the caller's value, and fColorCount (our value) may |
| 184 | differ by up to 2. In the above example: |
| 185 | colorCount = 2 |
| 186 | fColorCount = 4 |
| 187 | */ |
| 188 | fColorCount = colorCount; |
| 189 | // check if we need to add in dummy start and/or end position/colors |
| 190 | bool dummyFirst = false; |
| 191 | bool dummyLast = false; |
| 192 | if (pos) { |
| 193 | dummyFirst = pos[0] != 0; |
| 194 | dummyLast = pos[colorCount - 1] != SK_Scalar1; |
| 195 | fColorCount += dummyFirst + dummyLast; |
| 196 | } |
| 197 | |
| 198 | if (fColorCount > kColorStorageCount) { |
reed@android.com | 1c12abe | 2009-07-02 15:01:02 +0000 | [diff] [blame] | 199 | size_t size = sizeof(SkColor) + sizeof(Rec); |
reed@android.com | 41bccf5 | 2009-04-03 13:33:51 +0000 | [diff] [blame] | 200 | fOrigColors = reinterpret_cast<SkColor*>( |
| 201 | sk_malloc_throw(size * fColorCount)); |
| 202 | } |
| 203 | else { |
| 204 | fOrigColors = fStorage; |
| 205 | } |
| 206 | |
| 207 | // Now copy over the colors, adding the dummies as needed |
reed@android.com | 8a1c16f | 2008-12-17 15:59:43 +0000 | [diff] [blame] | 208 | { |
reed@android.com | 41bccf5 | 2009-04-03 13:33:51 +0000 | [diff] [blame] | 209 | SkColor* origColors = fOrigColors; |
| 210 | if (dummyFirst) { |
| 211 | *origColors++ = colors[0]; |
| 212 | } |
| 213 | memcpy(origColors, colors, colorCount * sizeof(SkColor)); |
| 214 | if (dummyLast) { |
| 215 | origColors += colorCount; |
| 216 | *origColors = colors[colorCount - 1]; |
| 217 | } |
| 218 | } |
reed@android.com | 8a1c16f | 2008-12-17 15:59:43 +0000 | [diff] [blame] | 219 | |
reed@android.com | 1c12abe | 2009-07-02 15:01:02 +0000 | [diff] [blame] | 220 | fRecs = (Rec*)(fOrigColors + fColorCount); |
reed@android.com | 41bccf5 | 2009-04-03 13:33:51 +0000 | [diff] [blame] | 221 | if (fColorCount > 2) { |
| 222 | Rec* recs = fRecs; |
| 223 | recs->fPos = 0; |
| 224 | // recs->fScale = 0; // unused; |
| 225 | recs += 1; |
| 226 | if (pos) { |
reed@android.com | 8a1c16f | 2008-12-17 15:59:43 +0000 | [diff] [blame] | 227 | /* We need to convert the user's array of relative positions into |
| 228 | fixed-point positions and scale factors. We need these results |
| 229 | to be strictly monotonic (no two values equal or out of order). |
| 230 | Hence this complex loop that just jams a zero for the scale |
| 231 | value if it sees a segment out of order, and it assures that |
| 232 | we start at 0 and end at 1.0 |
| 233 | */ |
| 234 | SkFixed prev = 0; |
reed@android.com | 41bccf5 | 2009-04-03 13:33:51 +0000 | [diff] [blame] | 235 | int startIndex = dummyFirst ? 0 : 1; |
| 236 | int count = colorCount + dummyLast; |
| 237 | for (int i = startIndex; i < count; i++) { |
reed@android.com | 8a1c16f | 2008-12-17 15:59:43 +0000 | [diff] [blame] | 238 | // force the last value to be 1.0 |
| 239 | SkFixed curr; |
reed@android.com | 41bccf5 | 2009-04-03 13:33:51 +0000 | [diff] [blame] | 240 | if (i == colorCount) { // we're really at the dummyLast |
reed@android.com | 8a1c16f | 2008-12-17 15:59:43 +0000 | [diff] [blame] | 241 | curr = SK_Fixed1; |
reed@android.com | 41bccf5 | 2009-04-03 13:33:51 +0000 | [diff] [blame] | 242 | } else { |
reed@android.com | 8a1c16f | 2008-12-17 15:59:43 +0000 | [diff] [blame] | 243 | curr = SkScalarToFixed(pos[i]); |
reed@android.com | 8a1c16f | 2008-12-17 15:59:43 +0000 | [diff] [blame] | 244 | } |
reed@android.com | 41bccf5 | 2009-04-03 13:33:51 +0000 | [diff] [blame] | 245 | // pin curr withing range |
| 246 | if (curr < 0) { |
| 247 | curr = 0; |
| 248 | } else if (curr > SK_Fixed1) { |
| 249 | curr = SK_Fixed1; |
| 250 | } |
| 251 | recs->fPos = curr; |
| 252 | if (curr > prev) { |
| 253 | recs->fScale = (1 << 24) / (curr - prev); |
| 254 | } else { |
| 255 | recs->fScale = 0; // ignore this segment |
| 256 | } |
reed@android.com | 8a1c16f | 2008-12-17 15:59:43 +0000 | [diff] [blame] | 257 | // get ready for the next value |
| 258 | prev = curr; |
reed@android.com | 41bccf5 | 2009-04-03 13:33:51 +0000 | [diff] [blame] | 259 | recs += 1; |
reed@android.com | 8a1c16f | 2008-12-17 15:59:43 +0000 | [diff] [blame] | 260 | } |
reed@android.com | 41bccf5 | 2009-04-03 13:33:51 +0000 | [diff] [blame] | 261 | } else { // assume even distribution |
reed@android.com | 8a1c16f | 2008-12-17 15:59:43 +0000 | [diff] [blame] | 262 | SkFixed dp = SK_Fixed1 / (colorCount - 1); |
| 263 | SkFixed p = dp; |
| 264 | SkFixed scale = (colorCount - 1) << 8; // (1 << 24) / dp |
reed@android.com | 41bccf5 | 2009-04-03 13:33:51 +0000 | [diff] [blame] | 265 | for (int i = 1; i < colorCount; i++) { |
| 266 | recs->fPos = p; |
| 267 | recs->fScale = scale; |
| 268 | recs += 1; |
reed@android.com | 8a1c16f | 2008-12-17 15:59:43 +0000 | [diff] [blame] | 269 | p += dp; |
| 270 | } |
| 271 | } |
| 272 | } |
reed@android.com | 4a7fd2b | 2009-06-02 19:46:20 +0000 | [diff] [blame] | 273 | fFlags = 0; |
reed@android.com | 8a1c16f | 2008-12-17 15:59:43 +0000 | [diff] [blame] | 274 | } |
| 275 | |
| 276 | Gradient_Shader::Gradient_Shader(SkFlattenableReadBuffer& buffer) : |
reed@android.com | 41bccf5 | 2009-04-03 13:33:51 +0000 | [diff] [blame] | 277 | INHERITED(buffer) { |
reed@android.com | 8a1c16f | 2008-12-17 15:59:43 +0000 | [diff] [blame] | 278 | fCacheAlpha = 256; |
| 279 | |
| 280 | fMapper = static_cast<SkUnitMapper*>(buffer.readFlattenable()); |
| 281 | |
| 282 | fCache16 = fCache16Storage = NULL; |
reed@google.com | dc731fd | 2010-12-23 15:19:47 +0000 | [diff] [blame^] | 283 | fCache32 = NULL; |
| 284 | fCache32PixelRef = NULL; |
reed@android.com | 8a1c16f | 2008-12-17 15:59:43 +0000 | [diff] [blame] | 285 | |
reed@android.com | 41bccf5 | 2009-04-03 13:33:51 +0000 | [diff] [blame] | 286 | int colorCount = fColorCount = buffer.readU32(); |
| 287 | if (colorCount > kColorStorageCount) { |
| 288 | size_t size = sizeof(SkColor) + sizeof(SkPMColor) + sizeof(Rec); |
| 289 | fOrigColors = (SkColor*)sk_malloc_throw(size * colorCount); |
| 290 | } else { |
reed@android.com | 8a1c16f | 2008-12-17 15:59:43 +0000 | [diff] [blame] | 291 | fOrigColors = fStorage; |
reed@android.com | 41bccf5 | 2009-04-03 13:33:51 +0000 | [diff] [blame] | 292 | } |
reed@android.com | 8a1c16f | 2008-12-17 15:59:43 +0000 | [diff] [blame] | 293 | buffer.read(fOrigColors, colorCount * sizeof(SkColor)); |
reed@android.com | 8a1c16f | 2008-12-17 15:59:43 +0000 | [diff] [blame] | 294 | |
| 295 | fTileMode = (TileMode)buffer.readU8(); |
| 296 | fTileProc = gTileProcs[fTileMode]; |
reed@android.com | 1c12abe | 2009-07-02 15:01:02 +0000 | [diff] [blame] | 297 | fRecs = (Rec*)(fOrigColors + colorCount); |
reed@android.com | 8a1c16f | 2008-12-17 15:59:43 +0000 | [diff] [blame] | 298 | if (colorCount > 2) { |
| 299 | Rec* recs = fRecs; |
| 300 | recs[0].fPos = 0; |
| 301 | for (int i = 1; i < colorCount; i++) { |
| 302 | recs[i].fPos = buffer.readS32(); |
| 303 | recs[i].fScale = buffer.readU32(); |
| 304 | } |
| 305 | } |
| 306 | buffer.read(&fPtsToUnit, sizeof(SkMatrix)); |
reed@android.com | 4a7fd2b | 2009-06-02 19:46:20 +0000 | [diff] [blame] | 307 | fFlags = 0; |
reed@android.com | 8a1c16f | 2008-12-17 15:59:43 +0000 | [diff] [blame] | 308 | } |
| 309 | |
reed@android.com | 41bccf5 | 2009-04-03 13:33:51 +0000 | [diff] [blame] | 310 | Gradient_Shader::~Gradient_Shader() { |
| 311 | if (fCache16Storage) { |
reed@android.com | 8a1c16f | 2008-12-17 15:59:43 +0000 | [diff] [blame] | 312 | sk_free(fCache16Storage); |
reed@android.com | 41bccf5 | 2009-04-03 13:33:51 +0000 | [diff] [blame] | 313 | } |
reed@google.com | dc731fd | 2010-12-23 15:19:47 +0000 | [diff] [blame^] | 314 | SkSafeUnref(fCache32PixelRef); |
reed@android.com | 41bccf5 | 2009-04-03 13:33:51 +0000 | [diff] [blame] | 315 | if (fOrigColors != fStorage) { |
reed@android.com | 8a1c16f | 2008-12-17 15:59:43 +0000 | [diff] [blame] | 316 | sk_free(fOrigColors); |
reed@android.com | 41bccf5 | 2009-04-03 13:33:51 +0000 | [diff] [blame] | 317 | } |
reed@android.com | 8a1c16f | 2008-12-17 15:59:43 +0000 | [diff] [blame] | 318 | fMapper->safeUnref(); |
| 319 | } |
| 320 | |
reed@android.com | 41bccf5 | 2009-04-03 13:33:51 +0000 | [diff] [blame] | 321 | void Gradient_Shader::flatten(SkFlattenableWriteBuffer& buffer) { |
reed@android.com | 8a1c16f | 2008-12-17 15:59:43 +0000 | [diff] [blame] | 322 | this->INHERITED::flatten(buffer); |
| 323 | buffer.writeFlattenable(fMapper); |
reed@android.com | 41bccf5 | 2009-04-03 13:33:51 +0000 | [diff] [blame] | 324 | buffer.write32(fColorCount); |
reed@android.com | 8a1c16f | 2008-12-17 15:59:43 +0000 | [diff] [blame] | 325 | buffer.writeMul4(fOrigColors, fColorCount * sizeof(SkColor)); |
| 326 | buffer.write8(fTileMode); |
| 327 | if (fColorCount > 2) { |
| 328 | Rec* recs = fRecs; |
| 329 | for (int i = 1; i < fColorCount; i++) { |
| 330 | buffer.write32(recs[i].fPos); |
| 331 | buffer.write32(recs[i].fScale); |
| 332 | } |
| 333 | } |
| 334 | buffer.writeMul4(&fPtsToUnit, sizeof(SkMatrix)); |
| 335 | } |
| 336 | |
| 337 | bool Gradient_Shader::setContext(const SkBitmap& device, |
| 338 | const SkPaint& paint, |
reed@android.com | 41bccf5 | 2009-04-03 13:33:51 +0000 | [diff] [blame] | 339 | const SkMatrix& matrix) { |
| 340 | if (!this->INHERITED::setContext(device, paint, matrix)) { |
reed@android.com | 8a1c16f | 2008-12-17 15:59:43 +0000 | [diff] [blame] | 341 | return false; |
reed@android.com | 41bccf5 | 2009-04-03 13:33:51 +0000 | [diff] [blame] | 342 | } |
reed@android.com | 8a1c16f | 2008-12-17 15:59:43 +0000 | [diff] [blame] | 343 | |
| 344 | const SkMatrix& inverse = this->getTotalInverse(); |
| 345 | |
| 346 | if (!fDstToIndex.setConcat(fPtsToUnit, inverse)) { |
| 347 | return false; |
| 348 | } |
| 349 | |
| 350 | fDstToIndexProc = fDstToIndex.getMapXYProc(); |
| 351 | fDstToIndexClass = (uint8_t)SkShader::ComputeMatrixClass(fDstToIndex); |
| 352 | |
| 353 | // now convert our colors in to PMColors |
| 354 | unsigned paintAlpha = this->getPaintAlpha(); |
| 355 | unsigned colorAlpha = 0xFF; |
| 356 | |
reed@android.com | 3d06a8c | 2009-07-07 18:19:59 +0000 | [diff] [blame] | 357 | // FIXME: record colorAlpha in constructor, since this is not affected |
| 358 | // by setContext() |
reed@android.com | 41bccf5 | 2009-04-03 13:33:51 +0000 | [diff] [blame] | 359 | for (int i = 0; i < fColorCount; i++) { |
reed@android.com | 8a1c16f | 2008-12-17 15:59:43 +0000 | [diff] [blame] | 360 | SkColor src = fOrigColors[i]; |
| 361 | unsigned sa = SkColorGetA(src); |
| 362 | colorAlpha &= sa; |
reed@android.com | 8a1c16f | 2008-12-17 15:59:43 +0000 | [diff] [blame] | 363 | } |
| 364 | |
| 365 | fFlags = this->INHERITED::getFlags(); |
| 366 | if ((colorAlpha & paintAlpha) == 0xFF) { |
| 367 | fFlags |= kOpaqueAlpha_Flag; |
| 368 | } |
| 369 | // we can do span16 as long as our individual colors are opaque, |
| 370 | // regardless of the paint's alpha |
| 371 | if (0xFF == colorAlpha) { |
| 372 | fFlags |= kHasSpan16_Flag; |
| 373 | } |
| 374 | |
| 375 | // if the new alpha differs from the previous time we were called, inval our cache |
| 376 | // this will trigger the cache to be rebuilt. |
| 377 | // we don't care about the first time, since the cache ptrs will already be NULL |
| 378 | if (fCacheAlpha != paintAlpha) { |
| 379 | fCache16 = NULL; // inval the cache |
| 380 | fCache32 = NULL; // inval the cache |
| 381 | fCacheAlpha = paintAlpha; // record the new alpha |
reed@android.com | 9b46e77 | 2009-06-05 12:24:41 +0000 | [diff] [blame] | 382 | // inform our subclasses |
reed@google.com | dc731fd | 2010-12-23 15:19:47 +0000 | [diff] [blame^] | 383 | if (fCache32PixelRef) { |
| 384 | fCache32PixelRef->notifyPixelsChanged(); |
| 385 | } |
reed@android.com | 8a1c16f | 2008-12-17 15:59:43 +0000 | [diff] [blame] | 386 | } |
| 387 | return true; |
| 388 | } |
| 389 | |
reed@android.com | 41bccf5 | 2009-04-03 13:33:51 +0000 | [diff] [blame] | 390 | static inline int blend8(int a, int b, int scale) { |
reed@android.com | 8a1c16f | 2008-12-17 15:59:43 +0000 | [diff] [blame] | 391 | SkASSERT(a == SkToU8(a)); |
| 392 | SkASSERT(b == SkToU8(b)); |
| 393 | SkASSERT(scale >= 0 && scale <= 256); |
reed@android.com | 8a1c16f | 2008-12-17 15:59:43 +0000 | [diff] [blame] | 394 | return a + ((b - a) * scale >> 8); |
| 395 | } |
| 396 | |
reed@android.com | 41bccf5 | 2009-04-03 13:33:51 +0000 | [diff] [blame] | 397 | static inline uint32_t dot8_blend_packed32(uint32_t s0, uint32_t s1, |
| 398 | int blend) { |
reed@android.com | 8a1c16f | 2008-12-17 15:59:43 +0000 | [diff] [blame] | 399 | #if 0 |
| 400 | int a = blend8(SkGetPackedA32(s0), SkGetPackedA32(s1), blend); |
| 401 | int r = blend8(SkGetPackedR32(s0), SkGetPackedR32(s1), blend); |
| 402 | int g = blend8(SkGetPackedG32(s0), SkGetPackedG32(s1), blend); |
| 403 | int b = blend8(SkGetPackedB32(s0), SkGetPackedB32(s1), blend); |
| 404 | |
| 405 | return SkPackARGB32(a, r, g, b); |
| 406 | #else |
| 407 | int otherBlend = 256 - blend; |
| 408 | |
| 409 | #if 0 |
| 410 | U32 t0 = (((s0 & 0xFF00FF) * blend + (s1 & 0xFF00FF) * otherBlend) >> 8) & 0xFF00FF; |
| 411 | U32 t1 = (((s0 >> 8) & 0xFF00FF) * blend + ((s1 >> 8) & 0xFF00FF) * otherBlend) & 0xFF00FF00; |
| 412 | SkASSERT((t0 & t1) == 0); |
| 413 | return t0 | t1; |
| 414 | #else |
| 415 | return ((((s0 & 0xFF00FF) * blend + (s1 & 0xFF00FF) * otherBlend) >> 8) & 0xFF00FF) | |
| 416 | ((((s0 >> 8) & 0xFF00FF) * blend + ((s1 >> 8) & 0xFF00FF) * otherBlend) & 0xFF00FF00); |
| 417 | #endif |
| 418 | |
| 419 | #endif |
| 420 | } |
| 421 | |
| 422 | #define Fixed_To_Dot8(x) (((x) + 0x80) >> 8) |
| 423 | |
reed@android.com | 41bccf5 | 2009-04-03 13:33:51 +0000 | [diff] [blame] | 424 | /** We take the original colors, not our premultiplied PMColors, since we can |
| 425 | build a 16bit table as long as the original colors are opaque, even if the |
| 426 | paint specifies a non-opaque alpha. |
reed@android.com | 8a1c16f | 2008-12-17 15:59:43 +0000 | [diff] [blame] | 427 | */ |
reed@android.com | 512a876 | 2009-12-14 15:25:36 +0000 | [diff] [blame] | 428 | void Gradient_Shader::Build16bitCache(uint16_t cache[], SkColor c0, SkColor c1, |
| 429 | int count) { |
reed@android.com | 8a1c16f | 2008-12-17 15:59:43 +0000 | [diff] [blame] | 430 | SkASSERT(count > 1); |
| 431 | SkASSERT(SkColorGetA(c0) == 0xFF); |
| 432 | SkASSERT(SkColorGetA(c1) == 0xFF); |
| 433 | |
| 434 | SkFixed r = SkColorGetR(c0); |
| 435 | SkFixed g = SkColorGetG(c0); |
| 436 | SkFixed b = SkColorGetB(c0); |
| 437 | |
| 438 | SkFixed dr = SkIntToFixed(SkColorGetR(c1) - r) / (count - 1); |
| 439 | SkFixed dg = SkIntToFixed(SkColorGetG(c1) - g) / (count - 1); |
| 440 | SkFixed db = SkIntToFixed(SkColorGetB(c1) - b) / (count - 1); |
| 441 | |
| 442 | r = SkIntToFixed(r) + 0x8000; |
| 443 | g = SkIntToFixed(g) + 0x8000; |
| 444 | b = SkIntToFixed(b) + 0x8000; |
| 445 | |
| 446 | do { |
| 447 | unsigned rr = r >> 16; |
| 448 | unsigned gg = g >> 16; |
| 449 | unsigned bb = b >> 16; |
| 450 | cache[0] = SkPackRGB16(SkR32ToR16(rr), SkG32ToG16(gg), SkB32ToB16(bb)); |
reed@android.com | 512a876 | 2009-12-14 15:25:36 +0000 | [diff] [blame] | 451 | cache[kCache16Count] = SkDitherPack888ToRGB16(rr, gg, bb); |
reed@android.com | 8a1c16f | 2008-12-17 15:59:43 +0000 | [diff] [blame] | 452 | cache += 1; |
| 453 | r += dr; |
| 454 | g += dg; |
| 455 | b += db; |
| 456 | } while (--count != 0); |
| 457 | } |
| 458 | |
reed@android.com | 1c12abe | 2009-07-02 15:01:02 +0000 | [diff] [blame] | 459 | static void build_32bit_cache(SkPMColor cache[], SkColor c0, SkColor c1, |
| 460 | int count, U8CPU paintAlpha) { |
reed@android.com | 8a1c16f | 2008-12-17 15:59:43 +0000 | [diff] [blame] | 461 | SkASSERT(count > 1); |
| 462 | |
reed@android.com | 1c12abe | 2009-07-02 15:01:02 +0000 | [diff] [blame] | 463 | // need to apply paintAlpha to our two endpoints |
| 464 | SkFixed a = SkMulDiv255Round(SkColorGetA(c0), paintAlpha); |
| 465 | SkFixed da; |
| 466 | { |
| 467 | int tmp = SkMulDiv255Round(SkColorGetA(c1), paintAlpha); |
| 468 | da = SkIntToFixed(tmp - a) / (count - 1); |
| 469 | } |
reed@android.com | 8a1c16f | 2008-12-17 15:59:43 +0000 | [diff] [blame] | 470 | |
reed@android.com | 1c12abe | 2009-07-02 15:01:02 +0000 | [diff] [blame] | 471 | SkFixed r = SkColorGetR(c0); |
| 472 | SkFixed g = SkColorGetG(c0); |
| 473 | SkFixed b = SkColorGetB(c0); |
| 474 | SkFixed dr = SkIntToFixed(SkColorGetR(c1) - r) / (count - 1); |
| 475 | SkFixed dg = SkIntToFixed(SkColorGetG(c1) - g) / (count - 1); |
| 476 | SkFixed db = SkIntToFixed(SkColorGetB(c1) - b) / (count - 1); |
reed@android.com | 8a1c16f | 2008-12-17 15:59:43 +0000 | [diff] [blame] | 477 | |
| 478 | a = SkIntToFixed(a) + 0x8000; |
| 479 | r = SkIntToFixed(r) + 0x8000; |
| 480 | g = SkIntToFixed(g) + 0x8000; |
| 481 | b = SkIntToFixed(b) + 0x8000; |
| 482 | |
| 483 | do { |
reed@android.com | 1c12abe | 2009-07-02 15:01:02 +0000 | [diff] [blame] | 484 | *cache++ = SkPreMultiplyARGB(a >> 16, r >> 16, g >> 16, b >> 16); |
reed@android.com | 8a1c16f | 2008-12-17 15:59:43 +0000 | [diff] [blame] | 485 | a += da; |
| 486 | r += dr; |
| 487 | g += dg; |
| 488 | b += db; |
| 489 | } while (--count != 0); |
| 490 | } |
| 491 | |
reed@android.com | 41bccf5 | 2009-04-03 13:33:51 +0000 | [diff] [blame] | 492 | static inline int SkFixedToFFFF(SkFixed x) { |
reed@android.com | 8a1c16f | 2008-12-17 15:59:43 +0000 | [diff] [blame] | 493 | SkASSERT((unsigned)x <= SK_Fixed1); |
| 494 | return x - (x >> 16); |
| 495 | } |
| 496 | |
reed@android.com | 200645d | 2009-12-14 16:41:57 +0000 | [diff] [blame] | 497 | static inline U16CPU bitsTo16(unsigned x, const unsigned bits) { |
reed@android.com | e191b16 | 2009-12-18 21:33:39 +0000 | [diff] [blame] | 498 | SkASSERT(x < (1U << bits)); |
reed@android.com | 200645d | 2009-12-14 16:41:57 +0000 | [diff] [blame] | 499 | if (6 == bits) { |
| 500 | return (x << 10) | (x << 4) | (x >> 2); |
| 501 | } |
| 502 | if (8 == bits) { |
| 503 | return (x << 8) | x; |
| 504 | } |
| 505 | sk_throw(); |
| 506 | return 0; |
reed@android.com | 8a1c16f | 2008-12-17 15:59:43 +0000 | [diff] [blame] | 507 | } |
| 508 | |
reed@android.com | 41bccf5 | 2009-04-03 13:33:51 +0000 | [diff] [blame] | 509 | const uint16_t* Gradient_Shader::getCache16() { |
| 510 | if (fCache16 == NULL) { |
reed@android.com | 3c9b2a4 | 2009-08-27 19:28:37 +0000 | [diff] [blame] | 511 | if (fCache16Storage == NULL) { // set the storage and our working ptr |
reed@android.com | 8a1c16f | 2008-12-17 15:59:43 +0000 | [diff] [blame] | 512 | fCache16Storage = (uint16_t*)sk_malloc_throw(sizeof(uint16_t) * kCache16Count * 2); |
reed@android.com | 3c9b2a4 | 2009-08-27 19:28:37 +0000 | [diff] [blame] | 513 | } |
reed@android.com | 8a1c16f | 2008-12-17 15:59:43 +0000 | [diff] [blame] | 514 | fCache16 = fCache16Storage; |
reed@android.com | 41bccf5 | 2009-04-03 13:33:51 +0000 | [diff] [blame] | 515 | if (fColorCount == 2) { |
reed@android.com | 512a876 | 2009-12-14 15:25:36 +0000 | [diff] [blame] | 516 | Build16bitCache(fCache16, fOrigColors[0], fOrigColors[1], kCache16Count); |
reed@android.com | 41bccf5 | 2009-04-03 13:33:51 +0000 | [diff] [blame] | 517 | } else { |
reed@android.com | 8a1c16f | 2008-12-17 15:59:43 +0000 | [diff] [blame] | 518 | Rec* rec = fRecs; |
| 519 | int prevIndex = 0; |
reed@android.com | 41bccf5 | 2009-04-03 13:33:51 +0000 | [diff] [blame] | 520 | for (int i = 1; i < fColorCount; i++) { |
reed@android.com | 512a876 | 2009-12-14 15:25:36 +0000 | [diff] [blame] | 521 | int nextIndex = SkFixedToFFFF(rec[i].fPos) >> kCache16Shift; |
reed@android.com | 8a1c16f | 2008-12-17 15:59:43 +0000 | [diff] [blame] | 522 | SkASSERT(nextIndex < kCache16Count); |
| 523 | |
| 524 | if (nextIndex > prevIndex) |
reed@android.com | 512a876 | 2009-12-14 15:25:36 +0000 | [diff] [blame] | 525 | Build16bitCache(fCache16 + prevIndex, fOrigColors[i-1], fOrigColors[i], nextIndex - prevIndex + 1); |
reed@android.com | 8a1c16f | 2008-12-17 15:59:43 +0000 | [diff] [blame] | 526 | prevIndex = nextIndex; |
| 527 | } |
| 528 | SkASSERT(prevIndex == kCache16Count - 1); |
| 529 | } |
| 530 | |
reed@android.com | 41bccf5 | 2009-04-03 13:33:51 +0000 | [diff] [blame] | 531 | if (fMapper) { |
reed@android.com | 8a1c16f | 2008-12-17 15:59:43 +0000 | [diff] [blame] | 532 | fCache16Storage = (uint16_t*)sk_malloc_throw(sizeof(uint16_t) * kCache16Count * 2); |
reed@android.com | 8a1c16f | 2008-12-17 15:59:43 +0000 | [diff] [blame] | 533 | uint16_t* linear = fCache16; // just computed linear data |
| 534 | uint16_t* mapped = fCache16Storage; // storage for mapped data |
| 535 | SkUnitMapper* map = fMapper; |
reed@android.com | 200645d | 2009-12-14 16:41:57 +0000 | [diff] [blame] | 536 | for (int i = 0; i < kCache16Count; i++) { |
| 537 | int index = map->mapUnit16(bitsTo16(i, kCache16Bits)) >> kCache16Shift; |
reed@android.com | 8a1c16f | 2008-12-17 15:59:43 +0000 | [diff] [blame] | 538 | mapped[i] = linear[index]; |
reed@android.com | 200645d | 2009-12-14 16:41:57 +0000 | [diff] [blame] | 539 | mapped[i + kCache16Count] = linear[index + kCache16Count]; |
reed@android.com | 8a1c16f | 2008-12-17 15:59:43 +0000 | [diff] [blame] | 540 | } |
| 541 | sk_free(fCache16); |
| 542 | fCache16 = fCache16Storage; |
| 543 | } |
| 544 | } |
| 545 | return fCache16; |
| 546 | } |
| 547 | |
reed@android.com | 41bccf5 | 2009-04-03 13:33:51 +0000 | [diff] [blame] | 548 | const SkPMColor* Gradient_Shader::getCache32() { |
| 549 | if (fCache32 == NULL) { |
reed@google.com | dc731fd | 2010-12-23 15:19:47 +0000 | [diff] [blame^] | 550 | if (NULL == fCache32PixelRef) { |
| 551 | fCache32PixelRef = SkNEW_ARGS(SkMallocPixelRef, (NULL, |
| 552 | sizeof(SkPMColor) * kCache32Count, |
| 553 | NULL)); |
| 554 | } |
| 555 | fCache32 = (SkPMColor*)fCache32PixelRef->getAddr(); |
reed@android.com | 41bccf5 | 2009-04-03 13:33:51 +0000 | [diff] [blame] | 556 | if (fColorCount == 2) { |
reed@android.com | 1c12abe | 2009-07-02 15:01:02 +0000 | [diff] [blame] | 557 | build_32bit_cache(fCache32, fOrigColors[0], fOrigColors[1], |
| 558 | kCache32Count, fCacheAlpha); |
reed@android.com | 41bccf5 | 2009-04-03 13:33:51 +0000 | [diff] [blame] | 559 | } else { |
reed@android.com | 8a1c16f | 2008-12-17 15:59:43 +0000 | [diff] [blame] | 560 | Rec* rec = fRecs; |
| 561 | int prevIndex = 0; |
reed@android.com | 41bccf5 | 2009-04-03 13:33:51 +0000 | [diff] [blame] | 562 | for (int i = 1; i < fColorCount; i++) { |
reed@android.com | 8a1c16f | 2008-12-17 15:59:43 +0000 | [diff] [blame] | 563 | int nextIndex = SkFixedToFFFF(rec[i].fPos) >> (16 - kCache32Bits); |
| 564 | SkASSERT(nextIndex < kCache32Count); |
| 565 | |
| 566 | if (nextIndex > prevIndex) |
reed@android.com | 1c12abe | 2009-07-02 15:01:02 +0000 | [diff] [blame] | 567 | build_32bit_cache(fCache32 + prevIndex, fOrigColors[i-1], |
| 568 | fOrigColors[i], |
| 569 | nextIndex - prevIndex + 1, fCacheAlpha); |
reed@android.com | 8a1c16f | 2008-12-17 15:59:43 +0000 | [diff] [blame] | 570 | prevIndex = nextIndex; |
| 571 | } |
| 572 | SkASSERT(prevIndex == kCache32Count - 1); |
| 573 | } |
| 574 | |
reed@android.com | 41bccf5 | 2009-04-03 13:33:51 +0000 | [diff] [blame] | 575 | if (fMapper) { |
reed@google.com | dc731fd | 2010-12-23 15:19:47 +0000 | [diff] [blame^] | 576 | SkMallocPixelRef* newPR = SkNEW_ARGS(SkMallocPixelRef, |
| 577 | (NULL, |
| 578 | sizeof(SkPMColor) * kCache32Count, |
| 579 | NULL)); |
reed@android.com | 8a1c16f | 2008-12-17 15:59:43 +0000 | [diff] [blame] | 580 | SkPMColor* linear = fCache32; // just computed linear data |
reed@google.com | dc731fd | 2010-12-23 15:19:47 +0000 | [diff] [blame^] | 581 | SkPMColor* mapped = (SkPMColor*)newPR->getAddr(); // storage for mapped data |
reed@android.com | 8a1c16f | 2008-12-17 15:59:43 +0000 | [diff] [blame] | 582 | SkUnitMapper* map = fMapper; |
reed@android.com | 41bccf5 | 2009-04-03 13:33:51 +0000 | [diff] [blame] | 583 | for (int i = 0; i < 256; i++) { |
reed@android.com | 8a1c16f | 2008-12-17 15:59:43 +0000 | [diff] [blame] | 584 | mapped[i] = linear[map->mapUnit16((i << 8) | i) >> 8]; |
reed@android.com | 41bccf5 | 2009-04-03 13:33:51 +0000 | [diff] [blame] | 585 | } |
reed@google.com | dc731fd | 2010-12-23 15:19:47 +0000 | [diff] [blame^] | 586 | fCache32PixelRef->unref(); |
| 587 | fCache32PixelRef = newPR; |
| 588 | fCache32 = (SkPMColor*)newPR->getAddr(); |
reed@android.com | 8a1c16f | 2008-12-17 15:59:43 +0000 | [diff] [blame] | 589 | } |
| 590 | } |
| 591 | return fCache32; |
| 592 | } |
| 593 | |
reed@google.com | dc731fd | 2010-12-23 15:19:47 +0000 | [diff] [blame^] | 594 | /* |
| 595 | * Because our caller might rebuild the same (logically the same) gradient |
| 596 | * over and over, we'd like to return exactly the same "bitmap" if possible, |
| 597 | * allowing the client to utilize a cache of our bitmap (e.g. with a GPU). |
| 598 | * To do that, we maintain a private cache of built-bitmaps, based on our |
| 599 | * colors and positions. Note: we don't try to flatten the fMapper, so if one |
| 600 | * is present, we skip the cache for now. |
| 601 | */ |
| 602 | void Gradient_Shader::commonAsABitmap(SkBitmap* bitmap) { |
| 603 | // don't have a way to put the mapper into our cache-key yet |
| 604 | if (fMapper) { |
| 605 | // force our cahce32pixelref to be built |
| 606 | (void)this->getCache32(); |
| 607 | bitmap->setConfig(SkBitmap::kARGB_8888_Config, kCache32Count, 1); |
| 608 | bitmap->setPixelRef(fCache32PixelRef); |
| 609 | return; |
| 610 | } |
| 611 | |
| 612 | // build our key: [numColors + colors[] + {positions[]} ] |
| 613 | int count = 1 + fColorCount; |
| 614 | if (fColorCount > 2) { |
| 615 | count += fColorCount - 1; // fRecs[].fPos |
| 616 | } |
| 617 | |
| 618 | SkAutoSTMalloc<16, int32_t> storage(count); |
| 619 | int32_t* buffer = storage.get(); |
| 620 | |
| 621 | *buffer++ = fColorCount; |
| 622 | memcpy(buffer, fOrigColors, fColorCount * sizeof(SkColor)); |
| 623 | buffer += fColorCount; |
| 624 | if (fColorCount > 2) { |
| 625 | for (int i = 1; i < fColorCount; i++) { |
| 626 | *buffer++ = fRecs[i].fPos; |
| 627 | } |
| 628 | } |
| 629 | SkASSERT(buffer - storage.get() == count); |
| 630 | |
| 631 | /////////////////////////////////// |
| 632 | |
| 633 | static SkMutex gMutex; |
| 634 | static SkBitmapCache* gCache; |
| 635 | // each cache cost 1K of RAM, since each bitmap will be 1x256 at 32bpp |
| 636 | static const int MAX_NUM_CACHED_GRADIENT_BITMAPS = 32; |
| 637 | SkAutoMutexAcquire ama(gMutex); |
| 638 | |
| 639 | if (NULL == gCache) { |
| 640 | gCache = new SkBitmapCache(MAX_NUM_CACHED_GRADIENT_BITMAPS); |
| 641 | } |
| 642 | size_t size = count * sizeof(int32_t); |
| 643 | |
| 644 | if (!gCache->find(storage.get(), size, bitmap)) { |
| 645 | // force our cahce32pixelref to be built |
| 646 | (void)this->getCache32(); |
| 647 | bitmap->setConfig(SkBitmap::kARGB_8888_Config, kCache32Count, 1); |
| 648 | bitmap->setPixelRef(fCache32PixelRef); |
| 649 | |
| 650 | gCache->add(storage.get(), size, *bitmap); |
| 651 | } |
| 652 | } |
| 653 | |
reed@android.com | 8a1c16f | 2008-12-17 15:59:43 +0000 | [diff] [blame] | 654 | /////////////////////////////////////////////////////////////////////////// |
| 655 | |
reed@android.com | 41bccf5 | 2009-04-03 13:33:51 +0000 | [diff] [blame] | 656 | static void pts_to_unit_matrix(const SkPoint pts[2], SkMatrix* matrix) { |
reed@android.com | 8a1c16f | 2008-12-17 15:59:43 +0000 | [diff] [blame] | 657 | SkVector vec = pts[1] - pts[0]; |
| 658 | SkScalar mag = vec.length(); |
| 659 | SkScalar inv = mag ? SkScalarInvert(mag) : 0; |
| 660 | |
| 661 | vec.scale(inv); |
| 662 | matrix->setSinCos(-vec.fY, vec.fX, pts[0].fX, pts[0].fY); |
| 663 | matrix->postTranslate(-pts[0].fX, -pts[0].fY); |
| 664 | matrix->postScale(inv, inv); |
| 665 | } |
| 666 | |
| 667 | /////////////////////////////////////////////////////////////////////////////// |
| 668 | |
| 669 | class Linear_Gradient : public Gradient_Shader { |
| 670 | public: |
| 671 | Linear_Gradient(const SkPoint pts[2], |
| 672 | const SkColor colors[], const SkScalar pos[], int colorCount, |
| 673 | SkShader::TileMode mode, SkUnitMapper* mapper) |
| 674 | : Gradient_Shader(colors, pos, colorCount, mode, mapper) |
| 675 | { |
| 676 | pts_to_unit_matrix(pts, &fPtsToUnit); |
| 677 | } |
reed@android.com | 9b46e77 | 2009-06-05 12:24:41 +0000 | [diff] [blame] | 678 | |
reed@android.com | 5119bdb | 2009-06-12 21:27:03 +0000 | [diff] [blame] | 679 | virtual bool setContext(const SkBitmap&, const SkPaint&, const SkMatrix&); |
reed@android.com | 8a1c16f | 2008-12-17 15:59:43 +0000 | [diff] [blame] | 680 | virtual void shadeSpan(int x, int y, SkPMColor dstC[], int count); |
| 681 | virtual void shadeSpan16(int x, int y, uint16_t dstC[], int count); |
reed@google.com | dc731fd | 2010-12-23 15:19:47 +0000 | [diff] [blame^] | 682 | virtual BitmapType asABitmap(SkBitmap*, SkMatrix*, |
| 683 | TileMode*, SkScalar* twoPointRadialParams); |
reed@android.com | 8a1c16f | 2008-12-17 15:59:43 +0000 | [diff] [blame] | 684 | |
| 685 | static SkFlattenable* CreateProc(SkFlattenableReadBuffer& buffer) { |
| 686 | return SkNEW_ARGS(Linear_Gradient, (buffer)); |
| 687 | } |
| 688 | |
| 689 | protected: |
reed@google.com | dc731fd | 2010-12-23 15:19:47 +0000 | [diff] [blame^] | 690 | Linear_Gradient(SkFlattenableReadBuffer& buffer) : Gradient_Shader(buffer) {} |
reed@android.com | 8a1c16f | 2008-12-17 15:59:43 +0000 | [diff] [blame] | 691 | virtual Factory getFactory() { return CreateProc; } |
| 692 | |
| 693 | private: |
| 694 | typedef Gradient_Shader INHERITED; |
| 695 | }; |
| 696 | |
reed@android.com | 5119bdb | 2009-06-12 21:27:03 +0000 | [diff] [blame] | 697 | bool Linear_Gradient::setContext(const SkBitmap& device, const SkPaint& paint, |
| 698 | const SkMatrix& matrix) { |
| 699 | if (!this->INHERITED::setContext(device, paint, matrix)) { |
| 700 | return false; |
| 701 | } |
| 702 | |
| 703 | unsigned mask = SkMatrix::kTranslate_Mask | SkMatrix::kScale_Mask; |
| 704 | if ((fDstToIndex.getType() & ~mask) == 0) { |
reed@android.com | 3c9b2a4 | 2009-08-27 19:28:37 +0000 | [diff] [blame] | 705 | fFlags |= SkShader::kConstInY32_Flag; |
| 706 | if ((fFlags & SkShader::kHasSpan16_Flag) && !paint.isDither()) { |
| 707 | // only claim this if we do have a 16bit mode (i.e. none of our |
| 708 | // colors have alpha), and if we are not dithering (which obviously |
| 709 | // is not const in Y). |
| 710 | fFlags |= SkShader::kConstInY16_Flag; |
| 711 | } |
reed@android.com | 5119bdb | 2009-06-12 21:27:03 +0000 | [diff] [blame] | 712 | } |
| 713 | return true; |
| 714 | } |
| 715 | |
reed@android.com | 8a1c16f | 2008-12-17 15:59:43 +0000 | [diff] [blame] | 716 | // Return true if fx, fx+dx, fx+2*dx, ... is always in range |
reed@android.com | fc25abd | 2009-01-15 14:38:33 +0000 | [diff] [blame] | 717 | static inline bool no_need_for_clamp(int fx, int dx, int count) |
reed@android.com | 8a1c16f | 2008-12-17 15:59:43 +0000 | [diff] [blame] | 718 | { |
| 719 | SkASSERT(count > 0); |
| 720 | return (unsigned)((fx | (fx + (count - 1) * dx)) >> 8) <= 0xFF; |
| 721 | } |
| 722 | |
| 723 | void Linear_Gradient::shadeSpan(int x, int y, SkPMColor dstC[], int count) |
| 724 | { |
| 725 | SkASSERT(count > 0); |
| 726 | |
| 727 | SkPoint srcPt; |
| 728 | SkMatrix::MapXYProc dstProc = fDstToIndexProc; |
| 729 | TileProc proc = fTileProc; |
| 730 | const SkPMColor* cache = this->getCache32(); |
| 731 | |
reed@android.com | c552a43 | 2009-06-12 20:02:50 +0000 | [diff] [blame] | 732 | if (fDstToIndexClass != kPerspective_MatrixClass) { |
reed@google.com | dc731fd | 2010-12-23 15:19:47 +0000 | [diff] [blame^] | 733 | dstProc(fDstToIndex, SkIntToScalar(x) + SK_ScalarHalf, |
| 734 | SkIntToScalar(y) + SK_ScalarHalf, &srcPt); |
reed@android.com | 8a1c16f | 2008-12-17 15:59:43 +0000 | [diff] [blame] | 735 | SkFixed dx, fx = SkScalarToFixed(srcPt.fX); |
| 736 | |
reed@android.com | c552a43 | 2009-06-12 20:02:50 +0000 | [diff] [blame] | 737 | if (fDstToIndexClass == kFixedStepInX_MatrixClass) { |
reed@android.com | 8a1c16f | 2008-12-17 15:59:43 +0000 | [diff] [blame] | 738 | SkFixed dxStorage[1]; |
| 739 | (void)fDstToIndex.fixedStepInX(SkIntToScalar(y), dxStorage, NULL); |
| 740 | dx = dxStorage[0]; |
reed@android.com | c552a43 | 2009-06-12 20:02:50 +0000 | [diff] [blame] | 741 | } else { |
reed@android.com | 8a1c16f | 2008-12-17 15:59:43 +0000 | [diff] [blame] | 742 | SkASSERT(fDstToIndexClass == kLinear_MatrixClass); |
| 743 | dx = SkScalarToFixed(fDstToIndex.getScaleX()); |
| 744 | } |
| 745 | |
reed@android.com | c552a43 | 2009-06-12 20:02:50 +0000 | [diff] [blame] | 746 | if (SkFixedNearlyZero(dx)) { |
| 747 | // we're a vertical gradient, so no change in a span |
reed@android.com | 8a1c16f | 2008-12-17 15:59:43 +0000 | [diff] [blame] | 748 | unsigned fi = proc(fx); |
| 749 | SkASSERT(fi <= 0xFFFF); |
| 750 | sk_memset32(dstC, cache[fi >> (16 - kCache32Bits)], count); |
reed@android.com | c552a43 | 2009-06-12 20:02:50 +0000 | [diff] [blame] | 751 | } else if (proc == clamp_tileproc) { |
reed@android.com | 8a1c16f | 2008-12-17 15:59:43 +0000 | [diff] [blame] | 752 | #if 0 |
| 753 | if (no_need_for_clamp(fx, dx, count)) |
| 754 | { |
| 755 | unsigned fi; |
| 756 | while ((count -= 4) >= 0) |
| 757 | { |
| 758 | fi = fx >> 8; SkASSERT(fi <= 0xFF); fx += dx; *dstC++ = cache[fi]; |
| 759 | fi = fx >> 8; SkASSERT(fi <= 0xFF); fx += dx; *dstC++ = cache[fi]; |
| 760 | fi = fx >> 8; SkASSERT(fi <= 0xFF); fx += dx; *dstC++ = cache[fi]; |
| 761 | fi = fx >> 8; SkASSERT(fi <= 0xFF); fx += dx; *dstC++ = cache[fi]; |
| 762 | } |
| 763 | SkASSERT(count <= -1 && count >= -4); |
| 764 | count += 4; |
| 765 | while (--count >= 0) |
| 766 | { |
| 767 | fi = fx >> 8; |
| 768 | SkASSERT(fi <= 0xFF); |
| 769 | fx += dx; |
| 770 | *dstC++ = cache[fi]; |
| 771 | } |
| 772 | } |
| 773 | else |
| 774 | #endif |
| 775 | do { |
| 776 | unsigned fi = SkClampMax(fx >> 8, 0xFF); |
| 777 | SkASSERT(fi <= 0xFF); |
| 778 | fx += dx; |
| 779 | *dstC++ = cache[fi]; |
| 780 | } while (--count != 0); |
reed@android.com | c552a43 | 2009-06-12 20:02:50 +0000 | [diff] [blame] | 781 | } else if (proc == mirror_tileproc) { |
reed@android.com | 8a1c16f | 2008-12-17 15:59:43 +0000 | [diff] [blame] | 782 | do { |
| 783 | unsigned fi = mirror_8bits(fx >> 8); |
| 784 | SkASSERT(fi <= 0xFF); |
| 785 | fx += dx; |
| 786 | *dstC++ = cache[fi]; |
| 787 | } while (--count != 0); |
reed@android.com | c552a43 | 2009-06-12 20:02:50 +0000 | [diff] [blame] | 788 | } else { |
reed@android.com | 8a1c16f | 2008-12-17 15:59:43 +0000 | [diff] [blame] | 789 | SkASSERT(proc == repeat_tileproc); |
| 790 | do { |
| 791 | unsigned fi = repeat_8bits(fx >> 8); |
| 792 | SkASSERT(fi <= 0xFF); |
| 793 | fx += dx; |
| 794 | *dstC++ = cache[fi]; |
| 795 | } while (--count != 0); |
| 796 | } |
reed@android.com | c552a43 | 2009-06-12 20:02:50 +0000 | [diff] [blame] | 797 | } else { |
reed@android.com | 8a1c16f | 2008-12-17 15:59:43 +0000 | [diff] [blame] | 798 | SkScalar dstX = SkIntToScalar(x); |
| 799 | SkScalar dstY = SkIntToScalar(y); |
| 800 | do { |
| 801 | dstProc(fDstToIndex, dstX, dstY, &srcPt); |
| 802 | unsigned fi = proc(SkScalarToFixed(srcPt.fX)); |
| 803 | SkASSERT(fi <= 0xFFFF); |
| 804 | *dstC++ = cache[fi >> (16 - kCache32Bits)]; |
| 805 | dstX += SK_Scalar1; |
| 806 | } while (--count != 0); |
| 807 | } |
| 808 | } |
| 809 | |
reed@google.com | dc731fd | 2010-12-23 15:19:47 +0000 | [diff] [blame^] | 810 | SkShader::BitmapType Linear_Gradient::asABitmap(SkBitmap* bitmap, |
| 811 | SkMatrix* matrix, |
| 812 | TileMode xy[], |
| 813 | SkScalar* twoPointRadialParams) { |
reed@android.com | 8a1c16f | 2008-12-17 15:59:43 +0000 | [diff] [blame] | 814 | if (bitmap) { |
reed@google.com | dc731fd | 2010-12-23 15:19:47 +0000 | [diff] [blame^] | 815 | this->commonAsABitmap(bitmap); |
reed@android.com | 8a1c16f | 2008-12-17 15:59:43 +0000 | [diff] [blame] | 816 | } |
| 817 | if (matrix) { |
| 818 | matrix->setScale(SkIntToScalar(kCache32Count), SK_Scalar1); |
| 819 | matrix->preConcat(fPtsToUnit); |
| 820 | } |
| 821 | if (xy) { |
| 822 | xy[0] = fTileMode; |
| 823 | xy[1] = kClamp_TileMode; |
| 824 | } |
reed@google.com | dc731fd | 2010-12-23 15:19:47 +0000 | [diff] [blame^] | 825 | return kDefault_BitmapType; |
reed@android.com | 8a1c16f | 2008-12-17 15:59:43 +0000 | [diff] [blame] | 826 | } |
| 827 | |
reed@android.com | 3c9b2a4 | 2009-08-27 19:28:37 +0000 | [diff] [blame] | 828 | static void dither_memset16(uint16_t dst[], uint16_t value, uint16_t other, |
| 829 | int count) { |
| 830 | if (reinterpret_cast<uintptr_t>(dst) & 2) { |
reed@android.com | 8a1c16f | 2008-12-17 15:59:43 +0000 | [diff] [blame] | 831 | *dst++ = value; |
| 832 | count -= 1; |
| 833 | SkTSwap(value, other); |
| 834 | } |
| 835 | |
| 836 | sk_memset32((uint32_t*)dst, (value << 16) | other, count >> 1); |
| 837 | |
reed@android.com | 3c9b2a4 | 2009-08-27 19:28:37 +0000 | [diff] [blame] | 838 | if (count & 1) { |
reed@android.com | 8a1c16f | 2008-12-17 15:59:43 +0000 | [diff] [blame] | 839 | dst[count - 1] = value; |
reed@android.com | 3c9b2a4 | 2009-08-27 19:28:37 +0000 | [diff] [blame] | 840 | } |
reed@android.com | 8a1c16f | 2008-12-17 15:59:43 +0000 | [diff] [blame] | 841 | } |
reed@android.com | 8a1c16f | 2008-12-17 15:59:43 +0000 | [diff] [blame] | 842 | |
| 843 | void Linear_Gradient::shadeSpan16(int x, int y, uint16_t dstC[], int count) |
| 844 | { |
| 845 | SkASSERT(count > 0); |
| 846 | |
| 847 | SkPoint srcPt; |
| 848 | SkMatrix::MapXYProc dstProc = fDstToIndexProc; |
| 849 | TileProc proc = fTileProc; |
| 850 | const uint16_t* cache = this->getCache16(); |
reed@android.com | 8a1c16f | 2008-12-17 15:59:43 +0000 | [diff] [blame] | 851 | int toggle = ((x ^ y) & 1) << kCache16Bits; |
reed@android.com | 8a1c16f | 2008-12-17 15:59:43 +0000 | [diff] [blame] | 852 | |
reed@android.com | b2c5f2d | 2009-06-12 20:09:24 +0000 | [diff] [blame] | 853 | if (fDstToIndexClass != kPerspective_MatrixClass) { |
reed@google.com | dc731fd | 2010-12-23 15:19:47 +0000 | [diff] [blame^] | 854 | dstProc(fDstToIndex, SkIntToScalar(x) + SK_ScalarHalf, |
| 855 | SkIntToScalar(y) + SK_ScalarHalf, &srcPt); |
reed@android.com | 8a1c16f | 2008-12-17 15:59:43 +0000 | [diff] [blame] | 856 | SkFixed dx, fx = SkScalarToFixed(srcPt.fX); |
| 857 | |
reed@android.com | b2c5f2d | 2009-06-12 20:09:24 +0000 | [diff] [blame] | 858 | if (fDstToIndexClass == kFixedStepInX_MatrixClass) { |
reed@android.com | 8a1c16f | 2008-12-17 15:59:43 +0000 | [diff] [blame] | 859 | SkFixed dxStorage[1]; |
| 860 | (void)fDstToIndex.fixedStepInX(SkIntToScalar(y), dxStorage, NULL); |
| 861 | dx = dxStorage[0]; |
reed@android.com | b2c5f2d | 2009-06-12 20:09:24 +0000 | [diff] [blame] | 862 | } else { |
reed@android.com | 8a1c16f | 2008-12-17 15:59:43 +0000 | [diff] [blame] | 863 | SkASSERT(fDstToIndexClass == kLinear_MatrixClass); |
| 864 | dx = SkScalarToFixed(fDstToIndex.getScaleX()); |
| 865 | } |
| 866 | |
reed@android.com | b2c5f2d | 2009-06-12 20:09:24 +0000 | [diff] [blame] | 867 | if (SkFixedNearlyZero(dx)) { |
| 868 | // we're a vertical gradient, so no change in a span |
reed@android.com | 512a876 | 2009-12-14 15:25:36 +0000 | [diff] [blame] | 869 | unsigned fi = proc(fx) >> kCache16Shift; |
| 870 | SkASSERT(fi <= kCache16Mask); |
reed@android.com | 8a1c16f | 2008-12-17 15:59:43 +0000 | [diff] [blame] | 871 | dither_memset16(dstC, cache[toggle + fi], cache[(toggle ^ (1 << kCache16Bits)) + fi], count); |
reed@android.com | b2c5f2d | 2009-06-12 20:09:24 +0000 | [diff] [blame] | 872 | } else if (proc == clamp_tileproc) { |
reed@android.com | 8a1c16f | 2008-12-17 15:59:43 +0000 | [diff] [blame] | 873 | do { |
reed@android.com | 512a876 | 2009-12-14 15:25:36 +0000 | [diff] [blame] | 874 | unsigned fi = SkClampMax(fx >> kCache16Shift, kCache16Mask); |
| 875 | SkASSERT(fi <= kCache16Mask); |
reed@android.com | 8a1c16f | 2008-12-17 15:59:43 +0000 | [diff] [blame] | 876 | fx += dx; |
reed@android.com | 8a1c16f | 2008-12-17 15:59:43 +0000 | [diff] [blame] | 877 | *dstC++ = cache[toggle + fi]; |
| 878 | toggle ^= (1 << kCache16Bits); |
reed@android.com | 8a1c16f | 2008-12-17 15:59:43 +0000 | [diff] [blame] | 879 | } while (--count != 0); |
reed@android.com | b2c5f2d | 2009-06-12 20:09:24 +0000 | [diff] [blame] | 880 | } else if (proc == mirror_tileproc) { |
reed@android.com | 8a1c16f | 2008-12-17 15:59:43 +0000 | [diff] [blame] | 881 | do { |
reed@android.com | 200645d | 2009-12-14 16:41:57 +0000 | [diff] [blame] | 882 | unsigned fi = mirror_bits(fx >> kCache16Shift, kCache16Bits); |
reed@android.com | 512a876 | 2009-12-14 15:25:36 +0000 | [diff] [blame] | 883 | SkASSERT(fi <= kCache16Mask); |
reed@android.com | 8a1c16f | 2008-12-17 15:59:43 +0000 | [diff] [blame] | 884 | fx += dx; |
reed@android.com | 8a1c16f | 2008-12-17 15:59:43 +0000 | [diff] [blame] | 885 | *dstC++ = cache[toggle + fi]; |
| 886 | toggle ^= (1 << kCache16Bits); |
reed@android.com | 8a1c16f | 2008-12-17 15:59:43 +0000 | [diff] [blame] | 887 | } while (--count != 0); |
reed@android.com | b2c5f2d | 2009-06-12 20:09:24 +0000 | [diff] [blame] | 888 | } else { |
reed@android.com | 8a1c16f | 2008-12-17 15:59:43 +0000 | [diff] [blame] | 889 | SkASSERT(proc == repeat_tileproc); |
| 890 | do { |
reed@android.com | 200645d | 2009-12-14 16:41:57 +0000 | [diff] [blame] | 891 | unsigned fi = repeat_bits(fx >> kCache16Shift, kCache16Bits); |
reed@android.com | 512a876 | 2009-12-14 15:25:36 +0000 | [diff] [blame] | 892 | SkASSERT(fi <= kCache16Mask); |
reed@android.com | 8a1c16f | 2008-12-17 15:59:43 +0000 | [diff] [blame] | 893 | fx += dx; |
reed@android.com | 8a1c16f | 2008-12-17 15:59:43 +0000 | [diff] [blame] | 894 | *dstC++ = cache[toggle + fi]; |
| 895 | toggle ^= (1 << kCache16Bits); |
reed@android.com | 8a1c16f | 2008-12-17 15:59:43 +0000 | [diff] [blame] | 896 | } while (--count != 0); |
| 897 | } |
reed@android.com | b2c5f2d | 2009-06-12 20:09:24 +0000 | [diff] [blame] | 898 | } else { |
reed@android.com | 8a1c16f | 2008-12-17 15:59:43 +0000 | [diff] [blame] | 899 | SkScalar dstX = SkIntToScalar(x); |
| 900 | SkScalar dstY = SkIntToScalar(y); |
| 901 | do { |
| 902 | dstProc(fDstToIndex, dstX, dstY, &srcPt); |
| 903 | unsigned fi = proc(SkScalarToFixed(srcPt.fX)); |
| 904 | SkASSERT(fi <= 0xFFFF); |
| 905 | |
reed@android.com | 512a876 | 2009-12-14 15:25:36 +0000 | [diff] [blame] | 906 | int index = fi >> kCache16Shift; |
reed@android.com | 8a1c16f | 2008-12-17 15:59:43 +0000 | [diff] [blame] | 907 | *dstC++ = cache[toggle + index]; |
| 908 | toggle ^= (1 << kCache16Bits); |
reed@android.com | 8a1c16f | 2008-12-17 15:59:43 +0000 | [diff] [blame] | 909 | |
| 910 | dstX += SK_Scalar1; |
| 911 | } while (--count != 0); |
| 912 | } |
| 913 | } |
| 914 | |
| 915 | /////////////////////////////////////////////////////////////////////////////// |
| 916 | |
| 917 | #define kSQRT_TABLE_BITS 11 |
| 918 | #define kSQRT_TABLE_SIZE (1 << kSQRT_TABLE_BITS) |
| 919 | |
| 920 | #include "SkRadialGradient_Table.h" |
| 921 | |
| 922 | #if defined(SK_BUILD_FOR_WIN32) && defined(SK_DEBUG) |
| 923 | |
| 924 | #include <stdio.h> |
| 925 | |
| 926 | void SkRadialGradient_BuildTable() |
| 927 | { |
| 928 | // build it 0..127 x 0..127, so we use 2^15 - 1 in the numerator for our "fixed" table |
| 929 | |
| 930 | FILE* file = ::fopen("SkRadialGradient_Table.h", "w"); |
| 931 | SkASSERT(file); |
| 932 | ::fprintf(file, "static const uint8_t gSqrt8Table[] = {\n"); |
| 933 | |
| 934 | for (int i = 0; i < kSQRT_TABLE_SIZE; i++) |
| 935 | { |
| 936 | if ((i & 15) == 0) |
| 937 | ::fprintf(file, "\t"); |
| 938 | |
| 939 | uint8_t value = SkToU8(SkFixedSqrt(i * SK_Fixed1 / kSQRT_TABLE_SIZE) >> 8); |
| 940 | |
| 941 | ::fprintf(file, "0x%02X", value); |
| 942 | if (i < kSQRT_TABLE_SIZE-1) |
| 943 | ::fprintf(file, ", "); |
| 944 | if ((i & 15) == 15) |
| 945 | ::fprintf(file, "\n"); |
| 946 | } |
| 947 | ::fprintf(file, "};\n"); |
| 948 | ::fclose(file); |
| 949 | } |
| 950 | |
| 951 | #endif |
| 952 | |
| 953 | |
| 954 | static void rad_to_unit_matrix(const SkPoint& center, SkScalar radius, SkMatrix* matrix) |
| 955 | { |
| 956 | SkScalar inv = SkScalarInvert(radius); |
| 957 | |
| 958 | matrix->setTranslate(-center.fX, -center.fY); |
| 959 | matrix->postScale(inv, inv); |
| 960 | } |
| 961 | |
| 962 | class Radial_Gradient : public Gradient_Shader { |
| 963 | public: |
| 964 | Radial_Gradient(const SkPoint& center, SkScalar radius, |
| 965 | const SkColor colors[], const SkScalar pos[], int colorCount, |
| 966 | SkShader::TileMode mode, SkUnitMapper* mapper) |
| 967 | : Gradient_Shader(colors, pos, colorCount, mode, mapper) |
| 968 | { |
| 969 | // make sure our table is insync with our current #define for kSQRT_TABLE_SIZE |
| 970 | SkASSERT(sizeof(gSqrt8Table) == kSQRT_TABLE_SIZE); |
| 971 | |
| 972 | rad_to_unit_matrix(center, radius, &fPtsToUnit); |
| 973 | } |
| 974 | virtual void shadeSpan(int x, int y, SkPMColor dstC[], int count) |
| 975 | { |
| 976 | SkASSERT(count > 0); |
| 977 | |
| 978 | SkPoint srcPt; |
| 979 | SkMatrix::MapXYProc dstProc = fDstToIndexProc; |
| 980 | TileProc proc = fTileProc; |
| 981 | const SkPMColor* cache = this->getCache32(); |
| 982 | |
| 983 | if (fDstToIndexClass != kPerspective_MatrixClass) |
| 984 | { |
reed@google.com | dc731fd | 2010-12-23 15:19:47 +0000 | [diff] [blame^] | 985 | dstProc(fDstToIndex, SkIntToScalar(x) + SK_ScalarHalf, |
| 986 | SkIntToScalar(y) + SK_ScalarHalf, &srcPt); |
reed@android.com | 8a1c16f | 2008-12-17 15:59:43 +0000 | [diff] [blame] | 987 | SkFixed dx, fx = SkScalarToFixed(srcPt.fX); |
| 988 | SkFixed dy, fy = SkScalarToFixed(srcPt.fY); |
| 989 | |
| 990 | if (fDstToIndexClass == kFixedStepInX_MatrixClass) |
| 991 | { |
| 992 | SkFixed storage[2]; |
| 993 | (void)fDstToIndex.fixedStepInX(SkIntToScalar(y), &storage[0], &storage[1]); |
| 994 | dx = storage[0]; |
| 995 | dy = storage[1]; |
| 996 | } |
| 997 | else |
| 998 | { |
| 999 | SkASSERT(fDstToIndexClass == kLinear_MatrixClass); |
| 1000 | dx = SkScalarToFixed(fDstToIndex.getScaleX()); |
| 1001 | dy = SkScalarToFixed(fDstToIndex.getSkewY()); |
| 1002 | } |
| 1003 | |
| 1004 | if (proc == clamp_tileproc) |
| 1005 | { |
| 1006 | const uint8_t* sqrt_table = gSqrt8Table; |
| 1007 | fx >>= 1; |
| 1008 | dx >>= 1; |
| 1009 | fy >>= 1; |
| 1010 | dy >>= 1; |
| 1011 | do { |
| 1012 | unsigned xx = SkPin32(fx, -0xFFFF >> 1, 0xFFFF >> 1); |
| 1013 | unsigned fi = SkPin32(fy, -0xFFFF >> 1, 0xFFFF >> 1); |
| 1014 | fi = (xx * xx + fi * fi) >> (14 + 16 - kSQRT_TABLE_BITS); |
| 1015 | fi = SkFastMin32(fi, 0xFFFF >> (16 - kSQRT_TABLE_BITS)); |
| 1016 | *dstC++ = cache[sqrt_table[fi] >> (8 - kCache32Bits)]; |
| 1017 | fx += dx; |
| 1018 | fy += dy; |
| 1019 | } while (--count != 0); |
| 1020 | } |
| 1021 | else if (proc == mirror_tileproc) |
| 1022 | { |
| 1023 | do { |
| 1024 | SkFixed dist = SkFixedSqrt(SkFixedSquare(fx) + SkFixedSquare(fy)); |
| 1025 | unsigned fi = mirror_tileproc(dist); |
| 1026 | SkASSERT(fi <= 0xFFFF); |
| 1027 | *dstC++ = cache[fi >> (16 - kCache32Bits)]; |
| 1028 | fx += dx; |
| 1029 | fy += dy; |
| 1030 | } while (--count != 0); |
| 1031 | } |
| 1032 | else |
| 1033 | { |
| 1034 | SkASSERT(proc == repeat_tileproc); |
| 1035 | do { |
| 1036 | SkFixed dist = SkFixedSqrt(SkFixedSquare(fx) + SkFixedSquare(fy)); |
| 1037 | unsigned fi = repeat_tileproc(dist); |
| 1038 | SkASSERT(fi <= 0xFFFF); |
| 1039 | *dstC++ = cache[fi >> (16 - kCache32Bits)]; |
| 1040 | fx += dx; |
| 1041 | fy += dy; |
| 1042 | } while (--count != 0); |
| 1043 | } |
| 1044 | } |
| 1045 | else // perspective case |
| 1046 | { |
| 1047 | SkScalar dstX = SkIntToScalar(x); |
| 1048 | SkScalar dstY = SkIntToScalar(y); |
| 1049 | do { |
| 1050 | dstProc(fDstToIndex, dstX, dstY, &srcPt); |
| 1051 | unsigned fi = proc(SkScalarToFixed(srcPt.length())); |
| 1052 | SkASSERT(fi <= 0xFFFF); |
| 1053 | *dstC++ = cache[fi >> (16 - kCache32Bits)]; |
| 1054 | dstX += SK_Scalar1; |
| 1055 | } while (--count != 0); |
| 1056 | } |
| 1057 | } |
reed@android.com | 3c9b2a4 | 2009-08-27 19:28:37 +0000 | [diff] [blame] | 1058 | |
| 1059 | virtual void shadeSpan16(int x, int y, uint16_t dstC[], int count) { |
reed@android.com | 8a1c16f | 2008-12-17 15:59:43 +0000 | [diff] [blame] | 1060 | SkASSERT(count > 0); |
| 1061 | |
| 1062 | SkPoint srcPt; |
| 1063 | SkMatrix::MapXYProc dstProc = fDstToIndexProc; |
| 1064 | TileProc proc = fTileProc; |
| 1065 | const uint16_t* cache = this->getCache16(); |
reed@android.com | 8a1c16f | 2008-12-17 15:59:43 +0000 | [diff] [blame] | 1066 | int toggle = ((x ^ y) & 1) << kCache16Bits; |
reed@android.com | 8a1c16f | 2008-12-17 15:59:43 +0000 | [diff] [blame] | 1067 | |
reed@android.com | 3c9b2a4 | 2009-08-27 19:28:37 +0000 | [diff] [blame] | 1068 | if (fDstToIndexClass != kPerspective_MatrixClass) { |
reed@google.com | dc731fd | 2010-12-23 15:19:47 +0000 | [diff] [blame^] | 1069 | dstProc(fDstToIndex, SkIntToScalar(x) + SK_ScalarHalf, |
| 1070 | SkIntToScalar(y) + SK_ScalarHalf, &srcPt); |
reed@android.com | 8a1c16f | 2008-12-17 15:59:43 +0000 | [diff] [blame] | 1071 | SkFixed dx, fx = SkScalarToFixed(srcPt.fX); |
| 1072 | SkFixed dy, fy = SkScalarToFixed(srcPt.fY); |
| 1073 | |
reed@android.com | 3c9b2a4 | 2009-08-27 19:28:37 +0000 | [diff] [blame] | 1074 | if (fDstToIndexClass == kFixedStepInX_MatrixClass) { |
reed@android.com | 8a1c16f | 2008-12-17 15:59:43 +0000 | [diff] [blame] | 1075 | SkFixed storage[2]; |
| 1076 | (void)fDstToIndex.fixedStepInX(SkIntToScalar(y), &storage[0], &storage[1]); |
| 1077 | dx = storage[0]; |
| 1078 | dy = storage[1]; |
reed@android.com | 3c9b2a4 | 2009-08-27 19:28:37 +0000 | [diff] [blame] | 1079 | } else { |
reed@android.com | 8a1c16f | 2008-12-17 15:59:43 +0000 | [diff] [blame] | 1080 | SkASSERT(fDstToIndexClass == kLinear_MatrixClass); |
| 1081 | dx = SkScalarToFixed(fDstToIndex.getScaleX()); |
| 1082 | dy = SkScalarToFixed(fDstToIndex.getSkewY()); |
| 1083 | } |
| 1084 | |
reed@android.com | 3c9b2a4 | 2009-08-27 19:28:37 +0000 | [diff] [blame] | 1085 | if (proc == clamp_tileproc) { |
reed@android.com | 8a1c16f | 2008-12-17 15:59:43 +0000 | [diff] [blame] | 1086 | const uint8_t* sqrt_table = gSqrt8Table; |
| 1087 | |
| 1088 | /* knock these down so we can pin against +- 0x7FFF, which is an immediate load, |
| 1089 | rather than 0xFFFF which is slower. This is a compromise, since it reduces our |
| 1090 | precision, but that appears to be visually OK. If we decide this is OK for |
| 1091 | all of our cases, we could (it seems) put this scale-down into fDstToIndex, |
| 1092 | to avoid having to do these extra shifts each time. |
| 1093 | */ |
| 1094 | fx >>= 1; |
| 1095 | dx >>= 1; |
| 1096 | fy >>= 1; |
| 1097 | dy >>= 1; |
reed@android.com | 3c9b2a4 | 2009-08-27 19:28:37 +0000 | [diff] [blame] | 1098 | if (dy == 0) { // might perform this check for the other modes, but the win will be a smaller % of the total |
reed@android.com | 8a1c16f | 2008-12-17 15:59:43 +0000 | [diff] [blame] | 1099 | fy = SkPin32(fy, -0xFFFF >> 1, 0xFFFF >> 1); |
| 1100 | fy *= fy; |
| 1101 | do { |
| 1102 | unsigned xx = SkPin32(fx, -0xFFFF >> 1, 0xFFFF >> 1); |
| 1103 | unsigned fi = (xx * xx + fy) >> (14 + 16 - kSQRT_TABLE_BITS); |
| 1104 | fi = SkFastMin32(fi, 0xFFFF >> (16 - kSQRT_TABLE_BITS)); |
| 1105 | fx += dx; |
reed@android.com | 8a1c16f | 2008-12-17 15:59:43 +0000 | [diff] [blame] | 1106 | *dstC++ = cache[toggle + (sqrt_table[fi] >> (8 - kCache16Bits))]; |
| 1107 | toggle ^= (1 << kCache16Bits); |
reed@android.com | 8a1c16f | 2008-12-17 15:59:43 +0000 | [diff] [blame] | 1108 | } while (--count != 0); |
reed@android.com | 3c9b2a4 | 2009-08-27 19:28:37 +0000 | [diff] [blame] | 1109 | } else { |
reed@android.com | 8a1c16f | 2008-12-17 15:59:43 +0000 | [diff] [blame] | 1110 | do { |
| 1111 | unsigned xx = SkPin32(fx, -0xFFFF >> 1, 0xFFFF >> 1); |
| 1112 | unsigned fi = SkPin32(fy, -0xFFFF >> 1, 0xFFFF >> 1); |
| 1113 | fi = (xx * xx + fi * fi) >> (14 + 16 - kSQRT_TABLE_BITS); |
| 1114 | fi = SkFastMin32(fi, 0xFFFF >> (16 - kSQRT_TABLE_BITS)); |
| 1115 | fx += dx; |
| 1116 | fy += dy; |
reed@android.com | 8a1c16f | 2008-12-17 15:59:43 +0000 | [diff] [blame] | 1117 | *dstC++ = cache[toggle + (sqrt_table[fi] >> (8 - kCache16Bits))]; |
| 1118 | toggle ^= (1 << kCache16Bits); |
reed@android.com | 8a1c16f | 2008-12-17 15:59:43 +0000 | [diff] [blame] | 1119 | } while (--count != 0); |
| 1120 | } |
reed@android.com | 3c9b2a4 | 2009-08-27 19:28:37 +0000 | [diff] [blame] | 1121 | } else if (proc == mirror_tileproc) { |
reed@android.com | 8a1c16f | 2008-12-17 15:59:43 +0000 | [diff] [blame] | 1122 | do { |
| 1123 | SkFixed dist = SkFixedSqrt(SkFixedSquare(fx) + SkFixedSquare(fy)); |
| 1124 | unsigned fi = mirror_tileproc(dist); |
| 1125 | SkASSERT(fi <= 0xFFFF); |
| 1126 | fx += dx; |
| 1127 | fy += dy; |
reed@android.com | 8a1c16f | 2008-12-17 15:59:43 +0000 | [diff] [blame] | 1128 | *dstC++ = cache[toggle + (fi >> (16 - kCache16Bits))]; |
| 1129 | toggle ^= (1 << kCache16Bits); |
reed@android.com | 8a1c16f | 2008-12-17 15:59:43 +0000 | [diff] [blame] | 1130 | } while (--count != 0); |
reed@android.com | 3c9b2a4 | 2009-08-27 19:28:37 +0000 | [diff] [blame] | 1131 | } else { |
reed@android.com | 8a1c16f | 2008-12-17 15:59:43 +0000 | [diff] [blame] | 1132 | SkASSERT(proc == repeat_tileproc); |
| 1133 | do { |
| 1134 | SkFixed dist = SkFixedSqrt(SkFixedSquare(fx) + SkFixedSquare(fy)); |
| 1135 | unsigned fi = repeat_tileproc(dist); |
| 1136 | SkASSERT(fi <= 0xFFFF); |
| 1137 | fx += dx; |
| 1138 | fy += dy; |
reed@android.com | 8a1c16f | 2008-12-17 15:59:43 +0000 | [diff] [blame] | 1139 | *dstC++ = cache[toggle + (fi >> (16 - kCache16Bits))]; |
| 1140 | toggle ^= (1 << kCache16Bits); |
reed@android.com | 8a1c16f | 2008-12-17 15:59:43 +0000 | [diff] [blame] | 1141 | } while (--count != 0); |
| 1142 | } |
reed@android.com | 3c9b2a4 | 2009-08-27 19:28:37 +0000 | [diff] [blame] | 1143 | } else { // perspective case |
reed@android.com | 8a1c16f | 2008-12-17 15:59:43 +0000 | [diff] [blame] | 1144 | SkScalar dstX = SkIntToScalar(x); |
| 1145 | SkScalar dstY = SkIntToScalar(y); |
| 1146 | do { |
| 1147 | dstProc(fDstToIndex, dstX, dstY, &srcPt); |
| 1148 | unsigned fi = proc(SkScalarToFixed(srcPt.length())); |
| 1149 | SkASSERT(fi <= 0xFFFF); |
| 1150 | |
| 1151 | int index = fi >> (16 - kCache16Bits); |
reed@android.com | 8a1c16f | 2008-12-17 15:59:43 +0000 | [diff] [blame] | 1152 | *dstC++ = cache[toggle + index]; |
| 1153 | toggle ^= (1 << kCache16Bits); |
reed@android.com | 8a1c16f | 2008-12-17 15:59:43 +0000 | [diff] [blame] | 1154 | |
| 1155 | dstX += SK_Scalar1; |
| 1156 | } while (--count != 0); |
| 1157 | } |
| 1158 | } |
| 1159 | |
reed@google.com | dc731fd | 2010-12-23 15:19:47 +0000 | [diff] [blame^] | 1160 | virtual BitmapType asABitmap(SkBitmap* bitmap, |
| 1161 | SkMatrix* matrix, |
| 1162 | TileMode* xy, |
| 1163 | SkScalar* twoPointRadialParams) { |
| 1164 | if (bitmap) { |
| 1165 | this->commonAsABitmap(bitmap); |
| 1166 | } |
| 1167 | if (matrix) { |
| 1168 | matrix->setScale(SkIntToScalar(kCache32Count), SkIntToScalar(kCache32Count)); |
| 1169 | matrix->preConcat(fPtsToUnit); |
| 1170 | } |
| 1171 | if (xy) { |
| 1172 | xy[0] = fTileMode; |
| 1173 | xy[1] = kClamp_TileMode; |
| 1174 | } |
| 1175 | return kRadial_BitmapType; |
| 1176 | } |
| 1177 | |
reed@android.com | 8a1c16f | 2008-12-17 15:59:43 +0000 | [diff] [blame] | 1178 | static SkFlattenable* CreateProc(SkFlattenableReadBuffer& buffer) { |
| 1179 | return SkNEW_ARGS(Radial_Gradient, (buffer)); |
| 1180 | } |
| 1181 | |
| 1182 | protected: |
| 1183 | Radial_Gradient(SkFlattenableReadBuffer& buffer) : Gradient_Shader(buffer) {}; |
| 1184 | virtual Factory getFactory() { return CreateProc; } |
| 1185 | |
| 1186 | private: |
| 1187 | typedef Gradient_Shader INHERITED; |
| 1188 | }; |
| 1189 | |
senorblanco@chromium.org | 7ef071f | 2009-09-22 17:25:29 +0000 | [diff] [blame] | 1190 | /* Two-point radial gradients are specified by two circles, each with a center |
| 1191 | point and radius. The gradient can be considered to be a series of |
| 1192 | concentric circles, with the color interpolated from the start circle |
| 1193 | (at t=0) to the end circle (at t=1). |
| 1194 | |
| 1195 | For each point (x, y) in the span, we want to find the |
| 1196 | interpolated circle that intersects that point. The center |
| 1197 | of the desired circle (Cx, Cy) falls at some distance t |
| 1198 | along the line segment between the start point (Sx, Sy) and |
| 1199 | end point (Ex, Ey): |
| 1200 | |
| 1201 | Cx = (1 - t) * Sx + t * Ex (0 <= t <= 1) |
| 1202 | Cy = (1 - t) * Sy + t * Ey |
| 1203 | |
| 1204 | The radius of the desired circle (r) is also a linear interpolation t |
| 1205 | between the start and end radii (Sr and Er): |
| 1206 | |
| 1207 | r = (1 - t) * Sr + t * Er |
| 1208 | |
| 1209 | But |
| 1210 | |
| 1211 | (x - Cx)^2 + (y - Cy)^2 = r^2 |
| 1212 | |
| 1213 | so |
| 1214 | |
| 1215 | (x - ((1 - t) * Sx + t * Ex))^2 |
| 1216 | + (y - ((1 - t) * Sy + t * Ey))^2 |
| 1217 | = ((1 - t) * Sr + t * Er)^2 |
| 1218 | |
| 1219 | Solving for t yields |
| 1220 | |
| 1221 | [(Sx - Ex)^2 + (Sy - Ey)^2 - (Er - Sr)^2)] * t^2 |
| 1222 | + [2 * (Sx - Ex)(x - Sx) + 2 * (Sy - Ey)(y - Sy) - 2 * (Er - Sr) * Sr] * t |
| 1223 | + [(x - Sx)^2 + (y - Sy)^2 - Sr^2] = 0 |
| 1224 | |
| 1225 | To simplify, let Dx = Sx - Ex, Dy = Sy - Ey, Dr = Er - Sr, dx = x - Sx, dy = y - Sy |
| 1226 | |
| 1227 | [Dx^2 + Dy^2 - Dr^2)] * t^2 |
| 1228 | + 2 * [Dx * dx + Dy * dy - Dr * Sr] * t |
| 1229 | + [dx^2 + dy^2 - Sr^2] = 0 |
| 1230 | |
| 1231 | A quadratic in t. The two roots of the quadratic reflect the two |
| 1232 | possible circles on which the point may fall. Solving for t yields |
| 1233 | the gradient value to use. |
| 1234 | |
| 1235 | If a<0, the start circle is entirely contained in the |
| 1236 | end circle, and one of the roots will be <0 or >1 (off the line |
| 1237 | segment). If a>0, the start circle falls at least partially |
| 1238 | outside the end circle (or vice versa), and the gradient |
| 1239 | defines a "tube" where a point may be on one circle (on the |
| 1240 | inside of the tube) or the other (outside of the tube). We choose |
| 1241 | one arbitrarily. |
| 1242 | |
| 1243 | In order to keep the math to within the limits of fixed point, |
| 1244 | we divide the entire quadratic by Dr^2, and replace |
| 1245 | (x - Sx)/Dr with x' and (y - Sy)/Dr with y', giving |
| 1246 | |
| 1247 | [Dx^2 / Dr^2 + Dy^2 / Dr^2 - 1)] * t^2 |
| 1248 | + 2 * [x' * Dx / Dr + y' * Dy / Dr - Sr / Dr] * t |
| 1249 | + [x'^2 + y'^2 - Sr^2/Dr^2] = 0 |
| 1250 | |
| 1251 | (x' and y' are computed by appending the subtract and scale to the |
| 1252 | fDstToIndex matrix in the constructor). |
| 1253 | |
| 1254 | Since the 'A' component of the quadratic is independent of x' and y', it |
| 1255 | is precomputed in the constructor. Since the 'B' component is linear in |
| 1256 | x' and y', if x and y are linear in the span, 'B' can be computed |
| 1257 | incrementally with a simple delta (db below). If it is not (e.g., |
| 1258 | a perspective projection), it must be computed in the loop. |
| 1259 | |
| 1260 | */ |
| 1261 | |
| 1262 | static inline SkFixed two_point_radial(SkFixed b, SkFixed fx, SkFixed fy, SkFixed sr2d2, SkFixed foura, SkFixed oneOverTwoA, bool posRoot) { |
| 1263 | SkFixed c = SkFixedSquare(fx) + SkFixedSquare(fy) - sr2d2; |
| 1264 | SkFixed discrim = SkFixedSquare(b) - SkFixedMul(foura, c); |
| 1265 | if (discrim < 0) { |
| 1266 | discrim = -discrim; |
| 1267 | } |
| 1268 | SkFixed rootDiscrim = SkFixedSqrt(discrim); |
| 1269 | if (posRoot) { |
| 1270 | return SkFixedMul(-b + rootDiscrim, oneOverTwoA); |
| 1271 | } else { |
| 1272 | return SkFixedMul(-b - rootDiscrim, oneOverTwoA); |
| 1273 | } |
| 1274 | } |
| 1275 | |
| 1276 | class Two_Point_Radial_Gradient : public Gradient_Shader { |
| 1277 | public: |
| 1278 | Two_Point_Radial_Gradient(const SkPoint& start, SkScalar startRadius, |
| 1279 | const SkPoint& end, SkScalar endRadius, |
| 1280 | const SkColor colors[], const SkScalar pos[], |
| 1281 | int colorCount, SkShader::TileMode mode, |
| 1282 | SkUnitMapper* mapper) |
| 1283 | : Gradient_Shader(colors, pos, colorCount, mode, mapper) |
| 1284 | { |
| 1285 | fDiff = start - end; |
| 1286 | fDiffRadius = endRadius - startRadius; |
| 1287 | SkScalar inv = SkScalarInvert(fDiffRadius); |
| 1288 | fDiff.fX = SkScalarMul(fDiff.fX, inv); |
| 1289 | fDiff.fY = SkScalarMul(fDiff.fY, inv); |
| 1290 | fStartRadius = SkScalarMul(startRadius, inv); |
| 1291 | fSr2D2 = SkScalarSquare(fStartRadius); |
| 1292 | fA = SkScalarSquare(fDiff.fX) + SkScalarSquare(fDiff.fY) - SK_Scalar1; |
| 1293 | fOneOverTwoA = SkScalarInvert(fA * 2); |
| 1294 | |
| 1295 | fPtsToUnit.setTranslate(-start.fX, -start.fY); |
| 1296 | fPtsToUnit.postScale(inv, inv); |
| 1297 | } |
reed@google.com | dc731fd | 2010-12-23 15:19:47 +0000 | [diff] [blame^] | 1298 | |
| 1299 | virtual BitmapType asABitmap(SkBitmap* bitmap, |
| 1300 | SkMatrix* matrix, |
| 1301 | TileMode* xy, |
| 1302 | SkScalar* twoPointRadialParams) { |
| 1303 | if (bitmap) { |
| 1304 | this->commonAsABitmap(bitmap); |
| 1305 | } |
| 1306 | SkScalar diffL = 0; // just to avoid gcc warning |
| 1307 | if (matrix || twoPointRadialParams) { |
| 1308 | diffL = SkScalarSqrt(SkScalarSquare(fDiff.fX) + |
| 1309 | SkScalarSquare(fDiff.fY)); |
| 1310 | } |
| 1311 | if (matrix) { |
| 1312 | SkScalar invDiffL = SkScalarInvert(diffL); |
| 1313 | matrix->setSinCos(-SkScalarMul(invDiffL, fDiff.fY), |
| 1314 | SkScalarMul(invDiffL, fDiff.fX)); |
| 1315 | matrix->preConcat(fPtsToUnit); |
| 1316 | } |
| 1317 | if (xy) { |
| 1318 | xy[0] = fTileMode; |
| 1319 | xy[1] = kClamp_TileMode; |
| 1320 | } |
| 1321 | if (NULL != twoPointRadialParams) { |
| 1322 | twoPointRadialParams[0] = diffL; |
| 1323 | twoPointRadialParams[1] = fStartRadius; |
| 1324 | twoPointRadialParams[2] = fDiffRadius; |
| 1325 | } |
| 1326 | return kTwoPointRadial_BitmapType; |
| 1327 | } |
| 1328 | |
senorblanco@chromium.org | 7ef071f | 2009-09-22 17:25:29 +0000 | [diff] [blame] | 1329 | virtual void shadeSpan(int x, int y, SkPMColor dstC[], int count) |
| 1330 | { |
| 1331 | SkASSERT(count > 0); |
| 1332 | |
| 1333 | // Zero difference between radii: fill with transparent black. |
| 1334 | if (fDiffRadius == 0) { |
| 1335 | sk_bzero(dstC, count * sizeof(*dstC)); |
| 1336 | return; |
| 1337 | } |
| 1338 | SkMatrix::MapXYProc dstProc = fDstToIndexProc; |
| 1339 | TileProc proc = fTileProc; |
| 1340 | const SkPMColor* cache = this->getCache32(); |
| 1341 | SkFixed diffx = SkScalarToFixed(fDiff.fX); |
| 1342 | SkFixed diffy = SkScalarToFixed(fDiff.fY); |
| 1343 | SkFixed foura = SkScalarToFixed(SkScalarMul(fA, 4)); |
| 1344 | SkFixed startRadius = SkScalarToFixed(fStartRadius); |
| 1345 | SkFixed sr2D2 = SkScalarToFixed(fSr2D2); |
| 1346 | SkFixed oneOverTwoA = SkScalarToFixed(fOneOverTwoA); |
| 1347 | bool posRoot = fDiffRadius < 0; |
| 1348 | if (fDstToIndexClass != kPerspective_MatrixClass) |
| 1349 | { |
| 1350 | SkPoint srcPt; |
reed@google.com | dc731fd | 2010-12-23 15:19:47 +0000 | [diff] [blame^] | 1351 | dstProc(fDstToIndex, SkIntToScalar(x) + SK_ScalarHalf, |
| 1352 | SkIntToScalar(y) + SK_ScalarHalf, &srcPt); |
senorblanco@chromium.org | 7ef071f | 2009-09-22 17:25:29 +0000 | [diff] [blame] | 1353 | SkFixed dx, fx = SkScalarToFixed(srcPt.fX); |
| 1354 | SkFixed dy, fy = SkScalarToFixed(srcPt.fY); |
| 1355 | |
| 1356 | if (fDstToIndexClass == kFixedStepInX_MatrixClass) |
| 1357 | { |
| 1358 | (void)fDstToIndex.fixedStepInX(SkIntToScalar(y), &dx, &dy); |
| 1359 | } |
| 1360 | else |
| 1361 | { |
| 1362 | SkASSERT(fDstToIndexClass == kLinear_MatrixClass); |
| 1363 | dx = SkScalarToFixed(fDstToIndex.getScaleX()); |
| 1364 | dy = SkScalarToFixed(fDstToIndex.getSkewY()); |
| 1365 | } |
| 1366 | SkFixed b = (SkFixedMul(diffx, fx) + |
| 1367 | SkFixedMul(diffy, fy) - startRadius) << 1; |
| 1368 | SkFixed db = (SkFixedMul(diffx, dx) + |
| 1369 | SkFixedMul(diffy, dy)) << 1; |
| 1370 | if (proc == clamp_tileproc) |
| 1371 | { |
| 1372 | for (; count > 0; --count) { |
| 1373 | SkFixed t = two_point_radial(b, fx, fy, sr2D2, foura, oneOverTwoA, posRoot); |
| 1374 | SkFixed index = SkClampMax(t, 0xFFFF); |
| 1375 | SkASSERT(index <= 0xFFFF); |
| 1376 | *dstC++ = cache[index >> (16 - kCache32Bits)]; |
| 1377 | fx += dx; |
| 1378 | fy += dy; |
| 1379 | b += db; |
| 1380 | } |
| 1381 | } |
| 1382 | else if (proc == mirror_tileproc) |
| 1383 | { |
| 1384 | for (; count > 0; --count) { |
| 1385 | SkFixed t = two_point_radial(b, fx, fy, sr2D2, foura, oneOverTwoA, posRoot); |
| 1386 | SkFixed index = mirror_tileproc(t); |
| 1387 | SkASSERT(index <= 0xFFFF); |
| 1388 | *dstC++ = cache[index >> (16 - kCache32Bits)]; |
| 1389 | fx += dx; |
| 1390 | fy += dy; |
| 1391 | b += db; |
| 1392 | } |
| 1393 | } |
| 1394 | else |
| 1395 | { |
| 1396 | SkASSERT(proc == repeat_tileproc); |
| 1397 | for (; count > 0; --count) { |
| 1398 | SkFixed t = two_point_radial(b, fx, fy, sr2D2, foura, oneOverTwoA, posRoot); |
| 1399 | SkFixed index = repeat_tileproc(t); |
| 1400 | SkASSERT(index <= 0xFFFF); |
| 1401 | *dstC++ = cache[index >> (16 - kCache32Bits)]; |
| 1402 | fx += dx; |
| 1403 | fy += dy; |
| 1404 | b += db; |
| 1405 | } |
| 1406 | } |
| 1407 | } |
| 1408 | else // perspective case |
| 1409 | { |
reed@android.com | 6c59a17 | 2009-09-22 20:24:05 +0000 | [diff] [blame] | 1410 | SkScalar dstX = SkIntToScalar(x); |
| 1411 | SkScalar dstY = SkIntToScalar(y); |
senorblanco@chromium.org | 7ef071f | 2009-09-22 17:25:29 +0000 | [diff] [blame] | 1412 | for (; count > 0; --count) { |
| 1413 | SkPoint srcPt; |
reed@android.com | 6c59a17 | 2009-09-22 20:24:05 +0000 | [diff] [blame] | 1414 | dstProc(fDstToIndex, dstX, dstY, &srcPt); |
senorblanco@chromium.org | 7ef071f | 2009-09-22 17:25:29 +0000 | [diff] [blame] | 1415 | SkFixed fx = SkScalarToFixed(srcPt.fX); |
| 1416 | SkFixed fy = SkScalarToFixed(srcPt.fY); |
| 1417 | SkFixed b = (SkFixedMul(diffx, fx) + |
| 1418 | SkFixedMul(diffy, fy) - startRadius) << 1; |
| 1419 | SkFixed t = two_point_radial(b, fx, fy, sr2D2, foura, oneOverTwoA, posRoot); |
| 1420 | SkFixed index = proc(t); |
| 1421 | SkASSERT(index <= 0xFFFF); |
| 1422 | *dstC++ = cache[index >> (16 - kCache32Bits)]; |
reed@android.com | 6c59a17 | 2009-09-22 20:24:05 +0000 | [diff] [blame] | 1423 | dstX += SK_Scalar1; |
senorblanco@chromium.org | 7ef071f | 2009-09-22 17:25:29 +0000 | [diff] [blame] | 1424 | } |
| 1425 | } |
| 1426 | } |
| 1427 | |
reed@android.com | 6c59a17 | 2009-09-22 20:24:05 +0000 | [diff] [blame] | 1428 | virtual bool setContext(const SkBitmap& device, |
| 1429 | const SkPaint& paint, |
| 1430 | const SkMatrix& matrix) { |
| 1431 | if (!this->INHERITED::setContext(device, paint, matrix)) { |
| 1432 | return false; |
| 1433 | } |
| 1434 | |
| 1435 | // we don't have a span16 proc |
| 1436 | fFlags &= ~kHasSpan16_Flag; |
| 1437 | return true; |
| 1438 | } |
| 1439 | |
senorblanco@chromium.org | 7ef071f | 2009-09-22 17:25:29 +0000 | [diff] [blame] | 1440 | static SkFlattenable* CreateProc(SkFlattenableReadBuffer& buffer) { |
| 1441 | return SkNEW_ARGS(Two_Point_Radial_Gradient, (buffer)); |
| 1442 | } |
| 1443 | |
reed@android.com | bcfc733 | 2009-11-10 16:19:39 +0000 | [diff] [blame] | 1444 | virtual void flatten(SkFlattenableWriteBuffer& buffer) { |
| 1445 | this->INHERITED::flatten(buffer); |
| 1446 | buffer.writeScalar(fDiff.fX); |
| 1447 | buffer.writeScalar(fDiff.fY); |
| 1448 | buffer.writeScalar(fStartRadius); |
| 1449 | buffer.writeScalar(fDiffRadius); |
| 1450 | buffer.writeScalar(fSr2D2); |
| 1451 | buffer.writeScalar(fA); |
| 1452 | buffer.writeScalar(fOneOverTwoA); |
| 1453 | } |
| 1454 | |
senorblanco@chromium.org | 7ef071f | 2009-09-22 17:25:29 +0000 | [diff] [blame] | 1455 | protected: |
reed@android.com | bcfc733 | 2009-11-10 16:19:39 +0000 | [diff] [blame] | 1456 | Two_Point_Radial_Gradient(SkFlattenableReadBuffer& buffer) |
| 1457 | : Gradient_Shader(buffer) { |
| 1458 | fDiff.fX = buffer.readScalar(); |
| 1459 | fDiff.fY = buffer.readScalar(); |
| 1460 | fStartRadius = buffer.readScalar(); |
| 1461 | fDiffRadius = buffer.readScalar(); |
| 1462 | fSr2D2 = buffer.readScalar(); |
| 1463 | fA = buffer.readScalar(); |
| 1464 | fOneOverTwoA = buffer.readScalar(); |
| 1465 | }; |
senorblanco@chromium.org | 7ef071f | 2009-09-22 17:25:29 +0000 | [diff] [blame] | 1466 | virtual Factory getFactory() { return CreateProc; } |
senorblanco@chromium.org | 7ef071f | 2009-09-22 17:25:29 +0000 | [diff] [blame] | 1467 | |
| 1468 | private: |
| 1469 | typedef Gradient_Shader INHERITED; |
| 1470 | SkPoint fDiff; |
| 1471 | SkScalar fStartRadius, fDiffRadius, fSr2D2, fA, fOneOverTwoA; |
| 1472 | }; |
| 1473 | |
reed@android.com | 8a1c16f | 2008-12-17 15:59:43 +0000 | [diff] [blame] | 1474 | /////////////////////////////////////////////////////////////////////////////// |
| 1475 | |
| 1476 | class Sweep_Gradient : public Gradient_Shader { |
| 1477 | public: |
| 1478 | Sweep_Gradient(SkScalar cx, SkScalar cy, const SkColor colors[], |
| 1479 | const SkScalar pos[], int count, SkUnitMapper* mapper) |
| 1480 | : Gradient_Shader(colors, pos, count, SkShader::kClamp_TileMode, mapper) |
| 1481 | { |
| 1482 | fPtsToUnit.setTranslate(-cx, -cy); |
| 1483 | } |
| 1484 | virtual void shadeSpan(int x, int y, SkPMColor dstC[], int count); |
| 1485 | virtual void shadeSpan16(int x, int y, uint16_t dstC[], int count); |
| 1486 | |
reed@google.com | dc731fd | 2010-12-23 15:19:47 +0000 | [diff] [blame^] | 1487 | virtual BitmapType asABitmap(SkBitmap* bitmap, |
| 1488 | SkMatrix* matrix, |
| 1489 | TileMode* xy, |
| 1490 | SkScalar* twoPointRadialParams) { |
| 1491 | if (bitmap) { |
| 1492 | this->commonAsABitmap(bitmap); |
| 1493 | } |
| 1494 | if (matrix) { |
| 1495 | *matrix = fPtsToUnit; |
| 1496 | } |
| 1497 | if (xy) { |
| 1498 | xy[0] = fTileMode; |
| 1499 | xy[1] = kClamp_TileMode; |
| 1500 | } |
| 1501 | return kSweep_BitmapType; |
| 1502 | } |
| 1503 | |
reed@android.com | 8a1c16f | 2008-12-17 15:59:43 +0000 | [diff] [blame] | 1504 | static SkFlattenable* CreateProc(SkFlattenableReadBuffer& buffer) { |
| 1505 | return SkNEW_ARGS(Sweep_Gradient, (buffer)); |
| 1506 | } |
| 1507 | |
| 1508 | protected: |
| 1509 | Sweep_Gradient(SkFlattenableReadBuffer& buffer) : Gradient_Shader(buffer) {} |
reed@android.com | 8a1c16f | 2008-12-17 15:59:43 +0000 | [diff] [blame] | 1510 | virtual Factory getFactory() { return CreateProc; } |
| 1511 | |
| 1512 | private: |
| 1513 | typedef Gradient_Shader INHERITED; |
| 1514 | }; |
| 1515 | |
| 1516 | #ifdef COMPUTE_SWEEP_TABLE |
| 1517 | #define PI 3.14159265 |
| 1518 | static bool gSweepTableReady; |
| 1519 | static uint8_t gSweepTable[65]; |
| 1520 | |
| 1521 | /* Our table stores precomputed values for atan: [0...1] -> [0..PI/4] |
| 1522 | We scale the results to [0..32] |
| 1523 | */ |
| 1524 | static const uint8_t* build_sweep_table() |
| 1525 | { |
| 1526 | if (!gSweepTableReady) |
| 1527 | { |
| 1528 | const int N = 65; |
| 1529 | const double DENOM = N - 1; |
| 1530 | |
| 1531 | for (int i = 0; i < N; i++) |
| 1532 | { |
| 1533 | double arg = i / DENOM; |
| 1534 | double v = atan(arg); |
| 1535 | int iv = (int)round(v * DENOM * 2 / PI); |
| 1536 | // printf("[%d] atan(%g) = %g %d\n", i, arg, v, iv); |
| 1537 | printf("%d, ", iv); |
| 1538 | gSweepTable[i] = iv; |
| 1539 | } |
| 1540 | gSweepTableReady = true; |
| 1541 | } |
| 1542 | return gSweepTable; |
| 1543 | } |
| 1544 | #else |
| 1545 | static const uint8_t gSweepTable[] = { |
| 1546 | 0, 1, 1, 2, 3, 3, 4, 4, 5, 6, 6, 7, 8, 8, 9, 9, |
| 1547 | 10, 11, 11, 12, 12, 13, 13, 14, 15, 15, 16, 16, 17, 17, 18, 18, |
| 1548 | 19, 19, 20, 20, 21, 21, 22, 22, 23, 23, 24, 24, 25, 25, 25, 26, |
| 1549 | 26, 27, 27, 27, 28, 28, 29, 29, 29, 30, 30, 30, 31, 31, 31, 32, |
| 1550 | 32 |
| 1551 | }; |
| 1552 | static const uint8_t* build_sweep_table() { return gSweepTable; } |
| 1553 | #endif |
| 1554 | |
| 1555 | // divide numer/denom, with a bias of 6bits. Assumes numer <= denom |
| 1556 | // and denom != 0. Since our table is 6bits big (+1), this is a nice fit. |
| 1557 | // Same as (but faster than) SkFixedDiv(numer, denom) >> 10 |
| 1558 | |
| 1559 | //unsigned div_64(int numer, int denom); |
| 1560 | static unsigned div_64(int numer, int denom) |
| 1561 | { |
| 1562 | SkASSERT(numer <= denom); |
| 1563 | SkASSERT(numer > 0); |
| 1564 | SkASSERT(denom > 0); |
| 1565 | |
| 1566 | int nbits = SkCLZ(numer); |
| 1567 | int dbits = SkCLZ(denom); |
| 1568 | int bits = 6 - nbits + dbits; |
| 1569 | SkASSERT(bits <= 6); |
| 1570 | |
| 1571 | if (bits < 0) // detect underflow |
| 1572 | return 0; |
| 1573 | |
| 1574 | denom <<= dbits - 1; |
| 1575 | numer <<= nbits - 1; |
| 1576 | |
| 1577 | unsigned result = 0; |
| 1578 | |
| 1579 | // do the first one |
| 1580 | if ((numer -= denom) >= 0) |
| 1581 | result = 1; |
| 1582 | else |
| 1583 | numer += denom; |
| 1584 | |
| 1585 | // Now fall into our switch statement if there are more bits to compute |
| 1586 | if (bits > 0) |
| 1587 | { |
| 1588 | // make room for the rest of the answer bits |
| 1589 | result <<= bits; |
| 1590 | switch (bits) { |
| 1591 | case 6: |
| 1592 | if ((numer = (numer << 1) - denom) >= 0) |
| 1593 | result |= 32; |
| 1594 | else |
| 1595 | numer += denom; |
| 1596 | case 5: |
| 1597 | if ((numer = (numer << 1) - denom) >= 0) |
| 1598 | result |= 16; |
| 1599 | else |
| 1600 | numer += denom; |
| 1601 | case 4: |
| 1602 | if ((numer = (numer << 1) - denom) >= 0) |
| 1603 | result |= 8; |
| 1604 | else |
| 1605 | numer += denom; |
| 1606 | case 3: |
| 1607 | if ((numer = (numer << 1) - denom) >= 0) |
| 1608 | result |= 4; |
| 1609 | else |
| 1610 | numer += denom; |
| 1611 | case 2: |
| 1612 | if ((numer = (numer << 1) - denom) >= 0) |
| 1613 | result |= 2; |
| 1614 | else |
| 1615 | numer += denom; |
| 1616 | case 1: |
| 1617 | default: // not strictly need, but makes GCC make better ARM code |
| 1618 | if ((numer = (numer << 1) - denom) >= 0) |
| 1619 | result |= 1; |
| 1620 | else |
| 1621 | numer += denom; |
| 1622 | } |
| 1623 | } |
| 1624 | return result; |
| 1625 | } |
| 1626 | |
| 1627 | // Given x,y in the first quadrant, return 0..63 for the angle [0..90] |
| 1628 | static unsigned atan_0_90(SkFixed y, SkFixed x) |
| 1629 | { |
| 1630 | #ifdef SK_DEBUG |
| 1631 | { |
| 1632 | static bool gOnce; |
| 1633 | if (!gOnce) |
| 1634 | { |
| 1635 | gOnce = true; |
| 1636 | SkASSERT(div_64(55, 55) == 64); |
| 1637 | SkASSERT(div_64(128, 256) == 32); |
| 1638 | SkASSERT(div_64(2326528, 4685824) == 31); |
| 1639 | SkASSERT(div_64(753664, 5210112) == 9); |
| 1640 | SkASSERT(div_64(229376, 4882432) == 3); |
| 1641 | SkASSERT(div_64(2, 64) == 2); |
| 1642 | SkASSERT(div_64(1, 64) == 1); |
| 1643 | // test that we handle underflow correctly |
| 1644 | SkASSERT(div_64(12345, 0x54321234) == 0); |
| 1645 | } |
| 1646 | } |
| 1647 | #endif |
| 1648 | |
| 1649 | SkASSERT(y > 0 && x > 0); |
| 1650 | const uint8_t* table = build_sweep_table(); |
| 1651 | |
| 1652 | unsigned result; |
| 1653 | bool swap = (x < y); |
| 1654 | if (swap) |
| 1655 | { |
| 1656 | // first part of the atan(v) = PI/2 - atan(1/v) identity |
| 1657 | // since our div_64 and table want v <= 1, where v = y/x |
| 1658 | SkTSwap<SkFixed>(x, y); |
| 1659 | } |
| 1660 | |
| 1661 | result = div_64(y, x); |
| 1662 | |
| 1663 | #ifdef SK_DEBUG |
| 1664 | { |
| 1665 | unsigned result2 = SkDivBits(y, x, 6); |
| 1666 | SkASSERT(result2 == result || |
| 1667 | (result == 1 && result2 == 0)); |
| 1668 | } |
| 1669 | #endif |
| 1670 | |
| 1671 | SkASSERT(result < SK_ARRAY_COUNT(gSweepTable)); |
| 1672 | result = table[result]; |
| 1673 | |
| 1674 | if (swap) |
| 1675 | { |
| 1676 | // complete the atan(v) = PI/2 - atan(1/v) identity |
| 1677 | result = 64 - result; |
| 1678 | // pin to 63 |
| 1679 | result -= result >> 6; |
| 1680 | } |
| 1681 | |
| 1682 | SkASSERT(result <= 63); |
| 1683 | return result; |
| 1684 | } |
| 1685 | |
| 1686 | // returns angle in a circle [0..2PI) -> [0..255] |
| 1687 | static unsigned SkATan2_255(SkFixed y, SkFixed x) |
| 1688 | { |
| 1689 | if (x == 0) |
| 1690 | { |
| 1691 | if (y == 0) |
| 1692 | return 0; |
| 1693 | return y < 0 ? 192 : 64; |
| 1694 | } |
| 1695 | if (y == 0) |
| 1696 | return x < 0 ? 128 : 0; |
| 1697 | |
| 1698 | /* Find the right quadrant for x,y |
| 1699 | Since atan_0_90 only handles the first quadrant, we rotate x,y |
| 1700 | appropriately before calling it, and then add the right amount |
| 1701 | to account for the real quadrant. |
| 1702 | quadrant 0 : add 0 | x > 0 && y > 0 |
| 1703 | quadrant 1 : add 64 (90 degrees) | x < 0 && y > 0 |
| 1704 | quadrant 2 : add 128 (180 degrees) | x < 0 && y < 0 |
| 1705 | quadrant 3 : add 192 (270 degrees) | x > 0 && y < 0 |
| 1706 | |
| 1707 | map x<0 to (1 << 6) |
| 1708 | map y<0 to (3 << 6) |
| 1709 | add = map_x ^ map_y |
| 1710 | */ |
| 1711 | int xsign = x >> 31; |
| 1712 | int ysign = y >> 31; |
| 1713 | int add = ((-xsign) ^ (ysign & 3)) << 6; |
| 1714 | |
| 1715 | #ifdef SK_DEBUG |
| 1716 | if (0 == add) |
| 1717 | SkASSERT(x > 0 && y > 0); |
| 1718 | else if (64 == add) |
| 1719 | SkASSERT(x < 0 && y > 0); |
| 1720 | else if (128 == add) |
| 1721 | SkASSERT(x < 0 && y < 0); |
| 1722 | else if (192 == add) |
| 1723 | SkASSERT(x > 0 && y < 0); |
| 1724 | else |
| 1725 | SkASSERT(!"bad value for add"); |
| 1726 | #endif |
| 1727 | |
| 1728 | /* This ^ trick makes x, y positive, and the swap<> handles quadrants |
| 1729 | where we need to rotate x,y by 90 or -90 |
| 1730 | */ |
| 1731 | x = (x ^ xsign) - xsign; |
| 1732 | y = (y ^ ysign) - ysign; |
| 1733 | if (add & 64) // quads 1 or 3 need to swap x,y |
| 1734 | SkTSwap<SkFixed>(x, y); |
| 1735 | |
| 1736 | unsigned result = add + atan_0_90(y, x); |
| 1737 | SkASSERT(result < 256); |
| 1738 | return result; |
| 1739 | } |
| 1740 | |
| 1741 | void Sweep_Gradient::shadeSpan(int x, int y, SkPMColor dstC[], int count) |
| 1742 | { |
| 1743 | SkMatrix::MapXYProc proc = fDstToIndexProc; |
| 1744 | const SkMatrix& matrix = fDstToIndex; |
| 1745 | const SkPMColor* cache = this->getCache32(); |
| 1746 | SkPoint srcPt; |
| 1747 | |
| 1748 | if (fDstToIndexClass != kPerspective_MatrixClass) |
| 1749 | { |
| 1750 | proc(matrix, SkIntToScalar(x) + SK_ScalarHalf, |
| 1751 | SkIntToScalar(y) + SK_ScalarHalf, &srcPt); |
| 1752 | SkFixed dx, fx = SkScalarToFixed(srcPt.fX); |
| 1753 | SkFixed dy, fy = SkScalarToFixed(srcPt.fY); |
| 1754 | |
| 1755 | if (fDstToIndexClass == kFixedStepInX_MatrixClass) |
| 1756 | { |
| 1757 | SkFixed storage[2]; |
| 1758 | (void)matrix.fixedStepInX(SkIntToScalar(y) + SK_ScalarHalf, |
| 1759 | &storage[0], &storage[1]); |
| 1760 | dx = storage[0]; |
| 1761 | dy = storage[1]; |
| 1762 | } |
| 1763 | else |
| 1764 | { |
| 1765 | SkASSERT(fDstToIndexClass == kLinear_MatrixClass); |
| 1766 | dx = SkScalarToFixed(matrix.getScaleX()); |
| 1767 | dy = SkScalarToFixed(matrix.getSkewY()); |
| 1768 | } |
| 1769 | |
| 1770 | for (; count > 0; --count) |
| 1771 | { |
| 1772 | *dstC++ = cache[SkATan2_255(fy, fx)]; |
| 1773 | fx += dx; |
| 1774 | fy += dy; |
| 1775 | } |
| 1776 | } |
| 1777 | else // perspective case |
| 1778 | { |
| 1779 | for (int stop = x + count; x < stop; x++) |
| 1780 | { |
| 1781 | proc(matrix, SkIntToScalar(x) + SK_ScalarHalf, |
| 1782 | SkIntToScalar(y) + SK_ScalarHalf, &srcPt); |
| 1783 | |
| 1784 | int index = SkATan2_255(SkScalarToFixed(srcPt.fY), |
| 1785 | SkScalarToFixed(srcPt.fX)); |
| 1786 | *dstC++ = cache[index]; |
| 1787 | } |
| 1788 | } |
| 1789 | } |
| 1790 | |
| 1791 | void Sweep_Gradient::shadeSpan16(int x, int y, uint16_t dstC[], int count) |
| 1792 | { |
| 1793 | SkMatrix::MapXYProc proc = fDstToIndexProc; |
| 1794 | const SkMatrix& matrix = fDstToIndex; |
| 1795 | const uint16_t* cache = this->getCache16(); |
| 1796 | int toggle = ((x ^ y) & 1) << kCache16Bits; |
| 1797 | SkPoint srcPt; |
| 1798 | |
| 1799 | if (fDstToIndexClass != kPerspective_MatrixClass) |
| 1800 | { |
| 1801 | proc(matrix, SkIntToScalar(x) + SK_ScalarHalf, |
| 1802 | SkIntToScalar(y) + SK_ScalarHalf, &srcPt); |
| 1803 | SkFixed dx, fx = SkScalarToFixed(srcPt.fX); |
| 1804 | SkFixed dy, fy = SkScalarToFixed(srcPt.fY); |
| 1805 | |
| 1806 | if (fDstToIndexClass == kFixedStepInX_MatrixClass) |
| 1807 | { |
| 1808 | SkFixed storage[2]; |
| 1809 | (void)matrix.fixedStepInX(SkIntToScalar(y) + SK_ScalarHalf, |
| 1810 | &storage[0], &storage[1]); |
| 1811 | dx = storage[0]; |
| 1812 | dy = storage[1]; |
| 1813 | } |
| 1814 | else |
| 1815 | { |
| 1816 | SkASSERT(fDstToIndexClass == kLinear_MatrixClass); |
| 1817 | dx = SkScalarToFixed(matrix.getScaleX()); |
| 1818 | dy = SkScalarToFixed(matrix.getSkewY()); |
| 1819 | } |
| 1820 | |
| 1821 | for (; count > 0; --count) |
| 1822 | { |
| 1823 | int index = SkATan2_255(fy, fx) >> (8 - kCache16Bits); |
| 1824 | *dstC++ = cache[toggle + index]; |
| 1825 | toggle ^= (1 << kCache16Bits); |
| 1826 | fx += dx; |
| 1827 | fy += dy; |
| 1828 | } |
| 1829 | } |
| 1830 | else // perspective case |
| 1831 | { |
| 1832 | for (int stop = x + count; x < stop; x++) |
| 1833 | { |
| 1834 | proc(matrix, SkIntToScalar(x) + SK_ScalarHalf, |
| 1835 | SkIntToScalar(y) + SK_ScalarHalf, &srcPt); |
| 1836 | |
| 1837 | int index = SkATan2_255(SkScalarToFixed(srcPt.fY), |
| 1838 | SkScalarToFixed(srcPt.fX)); |
| 1839 | index >>= (8 - kCache16Bits); |
| 1840 | *dstC++ = cache[toggle + index]; |
| 1841 | toggle ^= (1 << kCache16Bits); |
| 1842 | } |
| 1843 | } |
| 1844 | } |
| 1845 | |
| 1846 | /////////////////////////////////////////////////////////////////////////// |
| 1847 | /////////////////////////////////////////////////////////////////////////// |
| 1848 | |
| 1849 | // assumes colors is SkColor* and pos is SkScalar* |
| 1850 | #define EXPAND_1_COLOR(count) \ |
| 1851 | SkColor tmp[2]; \ |
| 1852 | do { \ |
| 1853 | if (1 == count) { \ |
| 1854 | tmp[0] = tmp[1] = colors[0]; \ |
| 1855 | colors = tmp; \ |
| 1856 | pos = NULL; \ |
| 1857 | count = 2; \ |
| 1858 | } \ |
| 1859 | } while (0) |
| 1860 | |
| 1861 | SkShader* SkGradientShader::CreateLinear( const SkPoint pts[2], |
| 1862 | const SkColor colors[], const SkScalar pos[], int colorCount, |
| 1863 | SkShader::TileMode mode, SkUnitMapper* mapper) |
| 1864 | { |
| 1865 | if (NULL == pts || NULL == colors || colorCount < 1) { |
| 1866 | return NULL; |
| 1867 | } |
| 1868 | EXPAND_1_COLOR(colorCount); |
| 1869 | |
reed@android.com | ab840b8 | 2009-07-01 17:00:03 +0000 | [diff] [blame] | 1870 | return SkNEW_ARGS(Linear_Gradient, |
| 1871 | (pts, colors, pos, colorCount, mode, mapper)); |
reed@android.com | 8a1c16f | 2008-12-17 15:59:43 +0000 | [diff] [blame] | 1872 | } |
| 1873 | |
| 1874 | SkShader* SkGradientShader::CreateRadial( const SkPoint& center, SkScalar radius, |
| 1875 | const SkColor colors[], const SkScalar pos[], int colorCount, |
| 1876 | SkShader::TileMode mode, SkUnitMapper* mapper) |
| 1877 | { |
| 1878 | if (radius <= 0 || NULL == colors || colorCount < 1) { |
| 1879 | return NULL; |
| 1880 | } |
| 1881 | EXPAND_1_COLOR(colorCount); |
| 1882 | |
reed@android.com | ab840b8 | 2009-07-01 17:00:03 +0000 | [diff] [blame] | 1883 | return SkNEW_ARGS(Radial_Gradient, |
| 1884 | (center, radius, colors, pos, colorCount, mode, mapper)); |
reed@android.com | 8a1c16f | 2008-12-17 15:59:43 +0000 | [diff] [blame] | 1885 | } |
| 1886 | |
senorblanco@chromium.org | 7ef071f | 2009-09-22 17:25:29 +0000 | [diff] [blame] | 1887 | SkShader* SkGradientShader::CreateTwoPointRadial(const SkPoint& start, |
| 1888 | SkScalar startRadius, |
| 1889 | const SkPoint& end, |
| 1890 | SkScalar endRadius, |
| 1891 | const SkColor colors[], |
| 1892 | const SkScalar pos[], |
| 1893 | int colorCount, |
| 1894 | SkShader::TileMode mode, |
| 1895 | SkUnitMapper* mapper) |
| 1896 | { |
| 1897 | if (startRadius < 0 || endRadius < 0 || NULL == colors || colorCount < 1) { |
| 1898 | return NULL; |
| 1899 | } |
| 1900 | EXPAND_1_COLOR(colorCount); |
| 1901 | |
| 1902 | return SkNEW_ARGS(Two_Point_Radial_Gradient, |
| 1903 | (start, startRadius, end, endRadius, colors, pos, colorCount, mode, mapper)); |
| 1904 | } |
| 1905 | |
reed@android.com | 8a1c16f | 2008-12-17 15:59:43 +0000 | [diff] [blame] | 1906 | SkShader* SkGradientShader::CreateSweep(SkScalar cx, SkScalar cy, |
| 1907 | const SkColor colors[], |
| 1908 | const SkScalar pos[], |
| 1909 | int count, SkUnitMapper* mapper) |
| 1910 | { |
| 1911 | if (NULL == colors || count < 1) { |
| 1912 | return NULL; |
| 1913 | } |
| 1914 | EXPAND_1_COLOR(count); |
| 1915 | |
| 1916 | return SkNEW_ARGS(Sweep_Gradient, (cx, cy, colors, pos, count, mapper)); |
| 1917 | } |
| 1918 | |
| 1919 | static SkFlattenable::Registrar gLinearGradientReg("Linear_Gradient", |
| 1920 | Linear_Gradient::CreateProc); |
| 1921 | |
| 1922 | static SkFlattenable::Registrar gRadialGradientReg("Radial_Gradient", |
| 1923 | Radial_Gradient::CreateProc); |
| 1924 | |
| 1925 | static SkFlattenable::Registrar gSweepGradientReg("Sweep_Gradient", |
| 1926 | Sweep_Gradient::CreateProc); |
| 1927 | |