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 | ** |
reed@google.com | 55b8e8c | 2011-01-13 16:22:35 +0000 | [diff] [blame] | 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 |
reed@android.com | 8a1c16f | 2008-12-17 15:59:43 +0000 | [diff] [blame] | 8 | ** |
reed@google.com | 55b8e8c | 2011-01-13 16:22:35 +0000 | [diff] [blame] | 9 | ** http://www.apache.org/licenses/LICENSE-2.0 |
reed@android.com | 8a1c16f | 2008-12-17 15:59:43 +0000 | [diff] [blame] | 10 | ** |
reed@google.com | 55b8e8c | 2011-01-13 16:22:35 +0000 | [diff] [blame] | 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 |
reed@android.com | 8a1c16f | 2008-12-17 15:59:43 +0000 | [diff] [blame] | 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@google.com | 9c7443d | 2011-01-17 18:46:37 +0000 | [diff] [blame] | 26 | #ifndef SK_DISABLE_DITHER_32BIT_GRADIENT |
| 27 | #define USE_DITHER_32BIT_GRADIENT |
| 28 | #endif |
reed@google.com | 55b8e8c | 2011-01-13 16:22:35 +0000 | [diff] [blame] | 29 | |
reed@google.com | 13659f1 | 2011-04-18 19:59:38 +0000 | [diff] [blame] | 30 | #define SK_ENABLE_FAST_LINEAR_GRADIENTS |
reed@google.com | 1770507 | 2011-04-18 12:43:32 +0000 | [diff] [blame] | 31 | |
| 32 | #ifdef SK_ENABLE_FAST_LINEAR_GRADIENTS |
reed@google.com | 5eb158d | 2011-04-15 15:50:34 +0000 | [diff] [blame] | 33 | static void sk_memset32_dither(uint32_t dst[], uint32_t v0, uint32_t v1, |
| 34 | int count) { |
| 35 | if (count > 0) { |
| 36 | if (v0 == v1) { |
| 37 | sk_memset32(dst, v0, count); |
| 38 | } else { |
| 39 | int pairs = count >> 1; |
| 40 | for (int i = 0; i < pairs; i++) { |
| 41 | *dst++ = v0; |
| 42 | *dst++ = v1; |
| 43 | } |
| 44 | if (count & 1) { |
| 45 | *dst = v0; |
| 46 | } |
| 47 | } |
| 48 | } |
| 49 | } |
reed@google.com | 1770507 | 2011-04-18 12:43:32 +0000 | [diff] [blame] | 50 | #endif |
reed@google.com | 5eb158d | 2011-04-15 15:50:34 +0000 | [diff] [blame] | 51 | |
reed@google.com | 61eb040 | 2011-04-15 12:11:12 +0000 | [diff] [blame] | 52 | /////////////////////////////////////////////////////////////////////////////// |
tomhudson@google.com | 9ce767c | 2011-04-25 20:49:39 +0000 | [diff] [blame] | 53 | // Can't use a two-argument function with side effects like this in a |
| 54 | // constructor's initializer's argument list because the order of |
| 55 | // evaluations in that context is undefined (and backwards on linux/gcc). |
| 56 | static SkPoint unflatten_point(SkReader32& buffer) { |
| 57 | SkPoint retval; |
| 58 | retval.fX = buffer.readScalar(); |
| 59 | retval.fY = buffer.readScalar(); |
| 60 | return retval; |
| 61 | } |
| 62 | |
| 63 | /////////////////////////////////////////////////////////////////////////////// |
reed@android.com | 8a1c16f | 2008-12-17 15:59:43 +0000 | [diff] [blame] | 64 | |
| 65 | typedef SkFixed (*TileProc)(SkFixed); |
| 66 | |
reed@android.com | 41bccf5 | 2009-04-03 13:33:51 +0000 | [diff] [blame] | 67 | static SkFixed clamp_tileproc(SkFixed x) { |
reed@android.com | 8a1c16f | 2008-12-17 15:59:43 +0000 | [diff] [blame] | 68 | return SkClampMax(x, 0xFFFF); |
| 69 | } |
| 70 | |
reed@android.com | 41bccf5 | 2009-04-03 13:33:51 +0000 | [diff] [blame] | 71 | static SkFixed repeat_tileproc(SkFixed x) { |
reed@android.com | 8a1c16f | 2008-12-17 15:59:43 +0000 | [diff] [blame] | 72 | return x & 0xFFFF; |
| 73 | } |
| 74 | |
reed@android.com | 41bccf5 | 2009-04-03 13:33:51 +0000 | [diff] [blame] | 75 | static inline SkFixed mirror_tileproc(SkFixed x) { |
reed@android.com | 8a1c16f | 2008-12-17 15:59:43 +0000 | [diff] [blame] | 76 | int s = x << 15 >> 31; |
| 77 | return (x ^ s) & 0xFFFF; |
| 78 | } |
| 79 | |
| 80 | static const TileProc gTileProcs[] = { |
| 81 | clamp_tileproc, |
| 82 | repeat_tileproc, |
| 83 | mirror_tileproc |
| 84 | }; |
| 85 | |
reed@google.com | 61eb040 | 2011-04-15 12:11:12 +0000 | [diff] [blame] | 86 | /////////////////////////////////////////////////////////////////////////////// |
reed@android.com | 8a1c16f | 2008-12-17 15:59:43 +0000 | [diff] [blame] | 87 | |
reed@android.com | 200645d | 2009-12-14 16:41:57 +0000 | [diff] [blame] | 88 | static inline int repeat_bits(int x, const int bits) { |
| 89 | return x & ((1 << bits) - 1); |
reed@android.com | 8a1c16f | 2008-12-17 15:59:43 +0000 | [diff] [blame] | 90 | } |
| 91 | |
reed@android.com | 200645d | 2009-12-14 16:41:57 +0000 | [diff] [blame] | 92 | static inline int mirror_bits(int x, const int bits) { |
reed@android.com | 8a1c16f | 2008-12-17 15:59:43 +0000 | [diff] [blame] | 93 | #ifdef SK_CPU_HAS_CONDITIONAL_INSTR |
reed@android.com | 200645d | 2009-12-14 16:41:57 +0000 | [diff] [blame] | 94 | if (x & (1 << bits)) |
reed@android.com | 8a1c16f | 2008-12-17 15:59:43 +0000 | [diff] [blame] | 95 | x = ~x; |
reed@android.com | 200645d | 2009-12-14 16:41:57 +0000 | [diff] [blame] | 96 | return x & ((1 << bits) - 1); |
reed@android.com | 8a1c16f | 2008-12-17 15:59:43 +0000 | [diff] [blame] | 97 | #else |
reed@android.com | 200645d | 2009-12-14 16:41:57 +0000 | [diff] [blame] | 98 | int s = x << (31 - bits) >> 31; |
| 99 | return (x ^ s) & ((1 << bits) - 1); |
reed@android.com | 8a1c16f | 2008-12-17 15:59:43 +0000 | [diff] [blame] | 100 | #endif |
| 101 | } |
| 102 | |
reed@android.com | 41bccf5 | 2009-04-03 13:33:51 +0000 | [diff] [blame] | 103 | static inline int repeat_8bits(int x) { |
reed@android.com | 8a1c16f | 2008-12-17 15:59:43 +0000 | [diff] [blame] | 104 | return x & 0xFF; |
| 105 | } |
| 106 | |
reed@android.com | 41bccf5 | 2009-04-03 13:33:51 +0000 | [diff] [blame] | 107 | static inline int mirror_8bits(int x) { |
reed@android.com | 8a1c16f | 2008-12-17 15:59:43 +0000 | [diff] [blame] | 108 | #ifdef SK_CPU_HAS_CONDITIONAL_INSTR |
reed@android.com | 41bccf5 | 2009-04-03 13:33:51 +0000 | [diff] [blame] | 109 | if (x & 256) { |
reed@android.com | 8a1c16f | 2008-12-17 15:59:43 +0000 | [diff] [blame] | 110 | x = ~x; |
reed@android.com | 41bccf5 | 2009-04-03 13:33:51 +0000 | [diff] [blame] | 111 | } |
reed@android.com | 8a1c16f | 2008-12-17 15:59:43 +0000 | [diff] [blame] | 112 | return x & 255; |
| 113 | #else |
| 114 | int s = x << 23 >> 31; |
| 115 | return (x ^ s) & 0xFF; |
| 116 | #endif |
| 117 | } |
| 118 | |
reed@google.com | 61eb040 | 2011-04-15 12:11:12 +0000 | [diff] [blame] | 119 | /////////////////////////////////////////////////////////////////////////////// |
reed@android.com | 8a1c16f | 2008-12-17 15:59:43 +0000 | [diff] [blame] | 120 | |
| 121 | class Gradient_Shader : public SkShader { |
| 122 | public: |
| 123 | Gradient_Shader(const SkColor colors[], const SkScalar pos[], |
reed@android.com | 41bccf5 | 2009-04-03 13:33:51 +0000 | [diff] [blame] | 124 | int colorCount, SkShader::TileMode mode, SkUnitMapper* mapper); |
reed@android.com | 8a1c16f | 2008-12-17 15:59:43 +0000 | [diff] [blame] | 125 | virtual ~Gradient_Shader(); |
| 126 | |
| 127 | // overrides |
| 128 | virtual bool setContext(const SkBitmap&, const SkPaint&, const SkMatrix&); |
| 129 | virtual uint32_t getFlags() { return fFlags; } |
| 130 | |
| 131 | protected: |
| 132 | Gradient_Shader(SkFlattenableReadBuffer& ); |
| 133 | SkUnitMapper* fMapper; |
| 134 | SkMatrix fPtsToUnit; // set by subclass |
| 135 | SkMatrix fDstToIndex; |
| 136 | SkMatrix::MapXYProc fDstToIndexProc; |
reed@android.com | 8a1c16f | 2008-12-17 15:59:43 +0000 | [diff] [blame] | 137 | TileMode fTileMode; |
| 138 | TileProc fTileProc; |
reed@android.com | 41bccf5 | 2009-04-03 13:33:51 +0000 | [diff] [blame] | 139 | int fColorCount; |
reed@android.com | 8a1c16f | 2008-12-17 15:59:43 +0000 | [diff] [blame] | 140 | uint8_t fDstToIndexClass; |
| 141 | uint8_t fFlags; |
| 142 | |
| 143 | struct Rec { |
| 144 | SkFixed fPos; // 0...1 |
| 145 | uint32_t fScale; // (1 << 24) / range |
| 146 | }; |
| 147 | Rec* fRecs; |
| 148 | |
| 149 | enum { |
reed@android.com | 512a876 | 2009-12-14 15:25:36 +0000 | [diff] [blame] | 150 | kCache16Bits = 8, // seems like enough for visual accuracy |
reed@android.com | 8a1c16f | 2008-12-17 15:59:43 +0000 | [diff] [blame] | 151 | kCache16Count = 1 << kCache16Bits, |
reed@android.com | 512a876 | 2009-12-14 15:25:36 +0000 | [diff] [blame] | 152 | kCache16Mask = kCache16Count - 1, |
| 153 | kCache16Shift = 16 - kCache16Bits, |
| 154 | |
reed@android.com | 8a1c16f | 2008-12-17 15:59:43 +0000 | [diff] [blame] | 155 | kCache32Bits = 8, // pretty much should always be 8 |
| 156 | kCache32Count = 1 << kCache32Bits |
| 157 | }; |
| 158 | virtual void flatten(SkFlattenableWriteBuffer& ); |
reed@google.com | 7c2f27d | 2011-03-07 19:29:00 +0000 | [diff] [blame] | 159 | const uint16_t* getCache16() const; |
| 160 | const SkPMColor* getCache32() const; |
reed@android.com | 8a1c16f | 2008-12-17 15:59:43 +0000 | [diff] [blame] | 161 | |
reed@google.com | 7c2f27d | 2011-03-07 19:29:00 +0000 | [diff] [blame] | 162 | void commonAsABitmap(SkBitmap*) const; |
vandebo@chromium.org | d3ae779 | 2011-02-24 00:21:06 +0000 | [diff] [blame] | 163 | void commonAsAGradient(GradientInfo*) const; |
reed@android.com | 9b46e77 | 2009-06-05 12:24:41 +0000 | [diff] [blame] | 164 | |
reed@android.com | 8a1c16f | 2008-12-17 15:59:43 +0000 | [diff] [blame] | 165 | private: |
| 166 | enum { |
| 167 | kColorStorageCount = 4, // more than this many colors, and we'll use sk_malloc for the space |
| 168 | |
reed@android.com | 1c12abe | 2009-07-02 15:01:02 +0000 | [diff] [blame] | 169 | kStorageSize = kColorStorageCount * (sizeof(SkColor) + sizeof(Rec)) |
reed@android.com | 8a1c16f | 2008-12-17 15:59:43 +0000 | [diff] [blame] | 170 | }; |
| 171 | SkColor fStorage[(kStorageSize + 3) >> 2]; |
| 172 | SkColor* fOrigColors; |
| 173 | |
reed@google.com | 7c2f27d | 2011-03-07 19:29:00 +0000 | [diff] [blame] | 174 | mutable uint16_t* fCache16; // working ptr. If this is NULL, we need to recompute the cache values |
| 175 | mutable SkPMColor* fCache32; // working ptr. If this is NULL, we need to recompute the cache values |
reed@android.com | 8a1c16f | 2008-12-17 15:59:43 +0000 | [diff] [blame] | 176 | |
reed@google.com | 7c2f27d | 2011-03-07 19:29:00 +0000 | [diff] [blame] | 177 | mutable uint16_t* fCache16Storage; // storage for fCache16, allocated on demand |
| 178 | mutable SkMallocPixelRef* fCache32PixelRef; |
reed@google.com | 95eed98 | 2011-07-05 17:01:56 +0000 | [diff] [blame^] | 179 | mutable unsigned fCacheAlpha; // the alpha value we used when we computed the cache. larger than 8bits so we can store uninitialized value |
reed@android.com | 8a1c16f | 2008-12-17 15:59:43 +0000 | [diff] [blame] | 180 | |
reed@android.com | 512a876 | 2009-12-14 15:25:36 +0000 | [diff] [blame] | 181 | static void Build16bitCache(uint16_t[], SkColor c0, SkColor c1, int count); |
reed@google.com | 55b8e8c | 2011-01-13 16:22:35 +0000 | [diff] [blame] | 182 | static void Build32bitCache(SkPMColor[], SkColor c0, SkColor c1, int count, |
| 183 | U8CPU alpha); |
reed@google.com | 95eed98 | 2011-07-05 17:01:56 +0000 | [diff] [blame^] | 184 | void setCacheAlpha(U8CPU alpha) const; |
reed@android.com | 512a876 | 2009-12-14 15:25:36 +0000 | [diff] [blame] | 185 | |
reed@android.com | 8a1c16f | 2008-12-17 15:59:43 +0000 | [diff] [blame] | 186 | typedef SkShader INHERITED; |
| 187 | }; |
| 188 | |
reed@android.com | 41bccf5 | 2009-04-03 13:33:51 +0000 | [diff] [blame] | 189 | static inline unsigned scalarToU16(SkScalar x) { |
reed@android.com | 8a1c16f | 2008-12-17 15:59:43 +0000 | [diff] [blame] | 190 | SkASSERT(x >= 0 && x <= SK_Scalar1); |
| 191 | |
| 192 | #ifdef SK_SCALAR_IS_FLOAT |
| 193 | return (unsigned)(x * 0xFFFF); |
| 194 | #else |
| 195 | return x - (x >> 16); // probably should be x - (x > 0x7FFF) but that is slower |
| 196 | #endif |
| 197 | } |
| 198 | |
reed@android.com | 41bccf5 | 2009-04-03 13:33:51 +0000 | [diff] [blame] | 199 | Gradient_Shader::Gradient_Shader(const SkColor colors[], const SkScalar pos[], |
| 200 | int colorCount, SkShader::TileMode mode, SkUnitMapper* mapper) { |
reed@android.com | 8a1c16f | 2008-12-17 15:59:43 +0000 | [diff] [blame] | 201 | SkASSERT(colorCount > 1); |
| 202 | |
| 203 | fCacheAlpha = 256; // init to a value that paint.getAlpha() can't return |
| 204 | |
| 205 | fMapper = mapper; |
reed@google.com | 82065d6 | 2011-02-07 15:30:46 +0000 | [diff] [blame] | 206 | SkSafeRef(mapper); |
reed@android.com | 8a1c16f | 2008-12-17 15:59:43 +0000 | [diff] [blame] | 207 | |
reed@android.com | 8a1c16f | 2008-12-17 15:59:43 +0000 | [diff] [blame] | 208 | SkASSERT((unsigned)mode < SkShader::kTileModeCount); |
| 209 | SkASSERT(SkShader::kTileModeCount == SK_ARRAY_COUNT(gTileProcs)); |
| 210 | fTileMode = mode; |
| 211 | fTileProc = gTileProcs[mode]; |
reed@google.com | 55b8e8c | 2011-01-13 16:22:35 +0000 | [diff] [blame] | 212 | |
reed@android.com | 41bccf5 | 2009-04-03 13:33:51 +0000 | [diff] [blame] | 213 | fCache16 = fCache16Storage = NULL; |
reed@google.com | dc731fd | 2010-12-23 15:19:47 +0000 | [diff] [blame] | 214 | fCache32 = NULL; |
| 215 | fCache32PixelRef = NULL; |
reed@android.com | 8a1c16f | 2008-12-17 15:59:43 +0000 | [diff] [blame] | 216 | |
reed@android.com | 41bccf5 | 2009-04-03 13:33:51 +0000 | [diff] [blame] | 217 | /* Note: we let the caller skip the first and/or last position. |
| 218 | i.e. pos[0] = 0.3, pos[1] = 0.7 |
| 219 | In these cases, we insert dummy entries to ensure that the final data |
| 220 | will be bracketed by [0, 1]. |
| 221 | i.e. our_pos[0] = 0, our_pos[1] = 0.3, our_pos[2] = 0.7, our_pos[3] = 1 |
| 222 | |
| 223 | Thus colorCount (the caller's value, and fColorCount (our value) may |
| 224 | differ by up to 2. In the above example: |
| 225 | colorCount = 2 |
| 226 | fColorCount = 4 |
| 227 | */ |
| 228 | fColorCount = colorCount; |
| 229 | // check if we need to add in dummy start and/or end position/colors |
| 230 | bool dummyFirst = false; |
| 231 | bool dummyLast = false; |
| 232 | if (pos) { |
| 233 | dummyFirst = pos[0] != 0; |
| 234 | dummyLast = pos[colorCount - 1] != SK_Scalar1; |
| 235 | fColorCount += dummyFirst + dummyLast; |
| 236 | } |
| 237 | |
| 238 | if (fColorCount > kColorStorageCount) { |
reed@android.com | 1c12abe | 2009-07-02 15:01:02 +0000 | [diff] [blame] | 239 | size_t size = sizeof(SkColor) + sizeof(Rec); |
reed@android.com | 41bccf5 | 2009-04-03 13:33:51 +0000 | [diff] [blame] | 240 | fOrigColors = reinterpret_cast<SkColor*>( |
| 241 | sk_malloc_throw(size * fColorCount)); |
| 242 | } |
| 243 | else { |
| 244 | fOrigColors = fStorage; |
| 245 | } |
| 246 | |
| 247 | // Now copy over the colors, adding the dummies as needed |
reed@android.com | 8a1c16f | 2008-12-17 15:59:43 +0000 | [diff] [blame] | 248 | { |
reed@android.com | 41bccf5 | 2009-04-03 13:33:51 +0000 | [diff] [blame] | 249 | SkColor* origColors = fOrigColors; |
| 250 | if (dummyFirst) { |
| 251 | *origColors++ = colors[0]; |
| 252 | } |
| 253 | memcpy(origColors, colors, colorCount * sizeof(SkColor)); |
| 254 | if (dummyLast) { |
| 255 | origColors += colorCount; |
| 256 | *origColors = colors[colorCount - 1]; |
| 257 | } |
| 258 | } |
reed@android.com | 8a1c16f | 2008-12-17 15:59:43 +0000 | [diff] [blame] | 259 | |
reed@android.com | 1c12abe | 2009-07-02 15:01:02 +0000 | [diff] [blame] | 260 | fRecs = (Rec*)(fOrigColors + fColorCount); |
reed@android.com | 41bccf5 | 2009-04-03 13:33:51 +0000 | [diff] [blame] | 261 | if (fColorCount > 2) { |
| 262 | Rec* recs = fRecs; |
| 263 | recs->fPos = 0; |
| 264 | // recs->fScale = 0; // unused; |
| 265 | recs += 1; |
| 266 | if (pos) { |
reed@android.com | 8a1c16f | 2008-12-17 15:59:43 +0000 | [diff] [blame] | 267 | /* We need to convert the user's array of relative positions into |
| 268 | fixed-point positions and scale factors. We need these results |
| 269 | to be strictly monotonic (no two values equal or out of order). |
| 270 | Hence this complex loop that just jams a zero for the scale |
| 271 | value if it sees a segment out of order, and it assures that |
| 272 | we start at 0 and end at 1.0 |
| 273 | */ |
| 274 | SkFixed prev = 0; |
reed@android.com | 41bccf5 | 2009-04-03 13:33:51 +0000 | [diff] [blame] | 275 | int startIndex = dummyFirst ? 0 : 1; |
| 276 | int count = colorCount + dummyLast; |
| 277 | for (int i = startIndex; i < count; i++) { |
reed@android.com | 8a1c16f | 2008-12-17 15:59:43 +0000 | [diff] [blame] | 278 | // force the last value to be 1.0 |
| 279 | SkFixed curr; |
reed@android.com | 41bccf5 | 2009-04-03 13:33:51 +0000 | [diff] [blame] | 280 | if (i == colorCount) { // we're really at the dummyLast |
reed@android.com | 8a1c16f | 2008-12-17 15:59:43 +0000 | [diff] [blame] | 281 | curr = SK_Fixed1; |
reed@android.com | 41bccf5 | 2009-04-03 13:33:51 +0000 | [diff] [blame] | 282 | } else { |
reed@android.com | 8a1c16f | 2008-12-17 15:59:43 +0000 | [diff] [blame] | 283 | curr = SkScalarToFixed(pos[i]); |
reed@android.com | 8a1c16f | 2008-12-17 15:59:43 +0000 | [diff] [blame] | 284 | } |
reed@android.com | 41bccf5 | 2009-04-03 13:33:51 +0000 | [diff] [blame] | 285 | // pin curr withing range |
| 286 | if (curr < 0) { |
| 287 | curr = 0; |
| 288 | } else if (curr > SK_Fixed1) { |
| 289 | curr = SK_Fixed1; |
| 290 | } |
| 291 | recs->fPos = curr; |
| 292 | if (curr > prev) { |
| 293 | recs->fScale = (1 << 24) / (curr - prev); |
| 294 | } else { |
| 295 | recs->fScale = 0; // ignore this segment |
| 296 | } |
reed@android.com | 8a1c16f | 2008-12-17 15:59:43 +0000 | [diff] [blame] | 297 | // get ready for the next value |
| 298 | prev = curr; |
reed@android.com | 41bccf5 | 2009-04-03 13:33:51 +0000 | [diff] [blame] | 299 | recs += 1; |
reed@android.com | 8a1c16f | 2008-12-17 15:59:43 +0000 | [diff] [blame] | 300 | } |
reed@android.com | 41bccf5 | 2009-04-03 13:33:51 +0000 | [diff] [blame] | 301 | } else { // assume even distribution |
reed@android.com | 8a1c16f | 2008-12-17 15:59:43 +0000 | [diff] [blame] | 302 | SkFixed dp = SK_Fixed1 / (colorCount - 1); |
| 303 | SkFixed p = dp; |
| 304 | SkFixed scale = (colorCount - 1) << 8; // (1 << 24) / dp |
reed@android.com | 41bccf5 | 2009-04-03 13:33:51 +0000 | [diff] [blame] | 305 | for (int i = 1; i < colorCount; i++) { |
| 306 | recs->fPos = p; |
| 307 | recs->fScale = scale; |
| 308 | recs += 1; |
reed@android.com | 8a1c16f | 2008-12-17 15:59:43 +0000 | [diff] [blame] | 309 | p += dp; |
| 310 | } |
| 311 | } |
| 312 | } |
reed@android.com | 4a7fd2b | 2009-06-02 19:46:20 +0000 | [diff] [blame] | 313 | fFlags = 0; |
reed@android.com | 8a1c16f | 2008-12-17 15:59:43 +0000 | [diff] [blame] | 314 | } |
| 315 | |
| 316 | Gradient_Shader::Gradient_Shader(SkFlattenableReadBuffer& buffer) : |
reed@android.com | 41bccf5 | 2009-04-03 13:33:51 +0000 | [diff] [blame] | 317 | INHERITED(buffer) { |
reed@android.com | 8a1c16f | 2008-12-17 15:59:43 +0000 | [diff] [blame] | 318 | fCacheAlpha = 256; |
| 319 | |
| 320 | fMapper = static_cast<SkUnitMapper*>(buffer.readFlattenable()); |
| 321 | |
| 322 | fCache16 = fCache16Storage = NULL; |
reed@google.com | dc731fd | 2010-12-23 15:19:47 +0000 | [diff] [blame] | 323 | fCache32 = NULL; |
| 324 | fCache32PixelRef = NULL; |
reed@android.com | 8a1c16f | 2008-12-17 15:59:43 +0000 | [diff] [blame] | 325 | |
reed@android.com | 41bccf5 | 2009-04-03 13:33:51 +0000 | [diff] [blame] | 326 | int colorCount = fColorCount = buffer.readU32(); |
| 327 | if (colorCount > kColorStorageCount) { |
| 328 | size_t size = sizeof(SkColor) + sizeof(SkPMColor) + sizeof(Rec); |
| 329 | fOrigColors = (SkColor*)sk_malloc_throw(size * colorCount); |
| 330 | } else { |
reed@android.com | 8a1c16f | 2008-12-17 15:59:43 +0000 | [diff] [blame] | 331 | fOrigColors = fStorage; |
reed@android.com | 41bccf5 | 2009-04-03 13:33:51 +0000 | [diff] [blame] | 332 | } |
reed@android.com | 8a1c16f | 2008-12-17 15:59:43 +0000 | [diff] [blame] | 333 | buffer.read(fOrigColors, colorCount * sizeof(SkColor)); |
reed@android.com | 8a1c16f | 2008-12-17 15:59:43 +0000 | [diff] [blame] | 334 | |
| 335 | fTileMode = (TileMode)buffer.readU8(); |
| 336 | fTileProc = gTileProcs[fTileMode]; |
reed@android.com | 1c12abe | 2009-07-02 15:01:02 +0000 | [diff] [blame] | 337 | fRecs = (Rec*)(fOrigColors + colorCount); |
reed@android.com | 8a1c16f | 2008-12-17 15:59:43 +0000 | [diff] [blame] | 338 | if (colorCount > 2) { |
| 339 | Rec* recs = fRecs; |
| 340 | recs[0].fPos = 0; |
| 341 | for (int i = 1; i < colorCount; i++) { |
| 342 | recs[i].fPos = buffer.readS32(); |
| 343 | recs[i].fScale = buffer.readU32(); |
| 344 | } |
| 345 | } |
reed@google.com | f2eb5ab | 2011-05-10 22:56:42 +0000 | [diff] [blame] | 346 | SkReadMatrix(&buffer, &fPtsToUnit); |
reed@android.com | 4a7fd2b | 2009-06-02 19:46:20 +0000 | [diff] [blame] | 347 | fFlags = 0; |
reed@android.com | 8a1c16f | 2008-12-17 15:59:43 +0000 | [diff] [blame] | 348 | } |
| 349 | |
reed@android.com | 41bccf5 | 2009-04-03 13:33:51 +0000 | [diff] [blame] | 350 | Gradient_Shader::~Gradient_Shader() { |
| 351 | if (fCache16Storage) { |
reed@android.com | 8a1c16f | 2008-12-17 15:59:43 +0000 | [diff] [blame] | 352 | sk_free(fCache16Storage); |
reed@android.com | 41bccf5 | 2009-04-03 13:33:51 +0000 | [diff] [blame] | 353 | } |
reed@google.com | dc731fd | 2010-12-23 15:19:47 +0000 | [diff] [blame] | 354 | SkSafeUnref(fCache32PixelRef); |
reed@android.com | 41bccf5 | 2009-04-03 13:33:51 +0000 | [diff] [blame] | 355 | if (fOrigColors != fStorage) { |
reed@android.com | 8a1c16f | 2008-12-17 15:59:43 +0000 | [diff] [blame] | 356 | sk_free(fOrigColors); |
reed@android.com | 41bccf5 | 2009-04-03 13:33:51 +0000 | [diff] [blame] | 357 | } |
reed@google.com | 82065d6 | 2011-02-07 15:30:46 +0000 | [diff] [blame] | 358 | SkSafeUnref(fMapper); |
reed@android.com | 8a1c16f | 2008-12-17 15:59:43 +0000 | [diff] [blame] | 359 | } |
| 360 | |
reed@android.com | 41bccf5 | 2009-04-03 13:33:51 +0000 | [diff] [blame] | 361 | void Gradient_Shader::flatten(SkFlattenableWriteBuffer& buffer) { |
reed@android.com | 8a1c16f | 2008-12-17 15:59:43 +0000 | [diff] [blame] | 362 | this->INHERITED::flatten(buffer); |
| 363 | buffer.writeFlattenable(fMapper); |
reed@android.com | 41bccf5 | 2009-04-03 13:33:51 +0000 | [diff] [blame] | 364 | buffer.write32(fColorCount); |
reed@android.com | 8a1c16f | 2008-12-17 15:59:43 +0000 | [diff] [blame] | 365 | buffer.writeMul4(fOrigColors, fColorCount * sizeof(SkColor)); |
| 366 | buffer.write8(fTileMode); |
| 367 | if (fColorCount > 2) { |
| 368 | Rec* recs = fRecs; |
| 369 | for (int i = 1; i < fColorCount; i++) { |
| 370 | buffer.write32(recs[i].fPos); |
| 371 | buffer.write32(recs[i].fScale); |
| 372 | } |
| 373 | } |
reed@google.com | f2eb5ab | 2011-05-10 22:56:42 +0000 | [diff] [blame] | 374 | SkWriteMatrix(&buffer, fPtsToUnit); |
reed@android.com | 8a1c16f | 2008-12-17 15:59:43 +0000 | [diff] [blame] | 375 | } |
| 376 | |
| 377 | bool Gradient_Shader::setContext(const SkBitmap& device, |
| 378 | const SkPaint& paint, |
reed@android.com | 41bccf5 | 2009-04-03 13:33:51 +0000 | [diff] [blame] | 379 | const SkMatrix& matrix) { |
| 380 | if (!this->INHERITED::setContext(device, paint, matrix)) { |
reed@android.com | 8a1c16f | 2008-12-17 15:59:43 +0000 | [diff] [blame] | 381 | return false; |
reed@android.com | 41bccf5 | 2009-04-03 13:33:51 +0000 | [diff] [blame] | 382 | } |
reed@android.com | 8a1c16f | 2008-12-17 15:59:43 +0000 | [diff] [blame] | 383 | |
| 384 | const SkMatrix& inverse = this->getTotalInverse(); |
| 385 | |
| 386 | if (!fDstToIndex.setConcat(fPtsToUnit, inverse)) { |
| 387 | return false; |
| 388 | } |
| 389 | |
| 390 | fDstToIndexProc = fDstToIndex.getMapXYProc(); |
| 391 | fDstToIndexClass = (uint8_t)SkShader::ComputeMatrixClass(fDstToIndex); |
| 392 | |
| 393 | // now convert our colors in to PMColors |
| 394 | unsigned paintAlpha = this->getPaintAlpha(); |
| 395 | unsigned colorAlpha = 0xFF; |
| 396 | |
reed@android.com | 3d06a8c | 2009-07-07 18:19:59 +0000 | [diff] [blame] | 397 | // FIXME: record colorAlpha in constructor, since this is not affected |
| 398 | // by setContext() |
reed@android.com | 41bccf5 | 2009-04-03 13:33:51 +0000 | [diff] [blame] | 399 | for (int i = 0; i < fColorCount; i++) { |
reed@android.com | 8a1c16f | 2008-12-17 15:59:43 +0000 | [diff] [blame] | 400 | SkColor src = fOrigColors[i]; |
| 401 | unsigned sa = SkColorGetA(src); |
| 402 | colorAlpha &= sa; |
reed@android.com | 8a1c16f | 2008-12-17 15:59:43 +0000 | [diff] [blame] | 403 | } |
| 404 | |
| 405 | fFlags = this->INHERITED::getFlags(); |
| 406 | if ((colorAlpha & paintAlpha) == 0xFF) { |
| 407 | fFlags |= kOpaqueAlpha_Flag; |
| 408 | } |
| 409 | // we can do span16 as long as our individual colors are opaque, |
| 410 | // regardless of the paint's alpha |
| 411 | if (0xFF == colorAlpha) { |
| 412 | fFlags |= kHasSpan16_Flag; |
| 413 | } |
| 414 | |
reed@google.com | 95eed98 | 2011-07-05 17:01:56 +0000 | [diff] [blame^] | 415 | this->setCacheAlpha(paintAlpha); |
| 416 | return true; |
| 417 | } |
| 418 | |
| 419 | void Gradient_Shader::setCacheAlpha(U8CPU alpha) const { |
reed@android.com | 8a1c16f | 2008-12-17 15:59:43 +0000 | [diff] [blame] | 420 | // if the new alpha differs from the previous time we were called, inval our cache |
| 421 | // this will trigger the cache to be rebuilt. |
| 422 | // we don't care about the first time, since the cache ptrs will already be NULL |
reed@google.com | 95eed98 | 2011-07-05 17:01:56 +0000 | [diff] [blame^] | 423 | if (fCacheAlpha != alpha) { |
| 424 | fCache16 = NULL; // inval the cache |
| 425 | fCache32 = NULL; // inval the cache |
| 426 | fCacheAlpha = alpha; // record the new alpha |
reed@android.com | 9b46e77 | 2009-06-05 12:24:41 +0000 | [diff] [blame] | 427 | // inform our subclasses |
reed@google.com | dc731fd | 2010-12-23 15:19:47 +0000 | [diff] [blame] | 428 | if (fCache32PixelRef) { |
| 429 | fCache32PixelRef->notifyPixelsChanged(); |
| 430 | } |
reed@android.com | 8a1c16f | 2008-12-17 15:59:43 +0000 | [diff] [blame] | 431 | } |
reed@android.com | 8a1c16f | 2008-12-17 15:59:43 +0000 | [diff] [blame] | 432 | } |
| 433 | |
reed@android.com | 41bccf5 | 2009-04-03 13:33:51 +0000 | [diff] [blame] | 434 | static inline int blend8(int a, int b, int scale) { |
reed@android.com | 8a1c16f | 2008-12-17 15:59:43 +0000 | [diff] [blame] | 435 | SkASSERT(a == SkToU8(a)); |
| 436 | SkASSERT(b == SkToU8(b)); |
| 437 | SkASSERT(scale >= 0 && scale <= 256); |
reed@android.com | 8a1c16f | 2008-12-17 15:59:43 +0000 | [diff] [blame] | 438 | return a + ((b - a) * scale >> 8); |
| 439 | } |
| 440 | |
reed@android.com | 41bccf5 | 2009-04-03 13:33:51 +0000 | [diff] [blame] | 441 | static inline uint32_t dot8_blend_packed32(uint32_t s0, uint32_t s1, |
| 442 | int blend) { |
reed@android.com | 8a1c16f | 2008-12-17 15:59:43 +0000 | [diff] [blame] | 443 | #if 0 |
| 444 | int a = blend8(SkGetPackedA32(s0), SkGetPackedA32(s1), blend); |
| 445 | int r = blend8(SkGetPackedR32(s0), SkGetPackedR32(s1), blend); |
| 446 | int g = blend8(SkGetPackedG32(s0), SkGetPackedG32(s1), blend); |
| 447 | int b = blend8(SkGetPackedB32(s0), SkGetPackedB32(s1), blend); |
| 448 | |
| 449 | return SkPackARGB32(a, r, g, b); |
| 450 | #else |
| 451 | int otherBlend = 256 - blend; |
| 452 | |
| 453 | #if 0 |
| 454 | U32 t0 = (((s0 & 0xFF00FF) * blend + (s1 & 0xFF00FF) * otherBlend) >> 8) & 0xFF00FF; |
| 455 | U32 t1 = (((s0 >> 8) & 0xFF00FF) * blend + ((s1 >> 8) & 0xFF00FF) * otherBlend) & 0xFF00FF00; |
| 456 | SkASSERT((t0 & t1) == 0); |
| 457 | return t0 | t1; |
| 458 | #else |
| 459 | return ((((s0 & 0xFF00FF) * blend + (s1 & 0xFF00FF) * otherBlend) >> 8) & 0xFF00FF) | |
| 460 | ((((s0 >> 8) & 0xFF00FF) * blend + ((s1 >> 8) & 0xFF00FF) * otherBlend) & 0xFF00FF00); |
| 461 | #endif |
| 462 | |
| 463 | #endif |
| 464 | } |
| 465 | |
| 466 | #define Fixed_To_Dot8(x) (((x) + 0x80) >> 8) |
| 467 | |
reed@android.com | 41bccf5 | 2009-04-03 13:33:51 +0000 | [diff] [blame] | 468 | /** We take the original colors, not our premultiplied PMColors, since we can |
| 469 | build a 16bit table as long as the original colors are opaque, even if the |
| 470 | paint specifies a non-opaque alpha. |
reed@android.com | 8a1c16f | 2008-12-17 15:59:43 +0000 | [diff] [blame] | 471 | */ |
reed@android.com | 512a876 | 2009-12-14 15:25:36 +0000 | [diff] [blame] | 472 | void Gradient_Shader::Build16bitCache(uint16_t cache[], SkColor c0, SkColor c1, |
| 473 | int count) { |
reed@android.com | 8a1c16f | 2008-12-17 15:59:43 +0000 | [diff] [blame] | 474 | SkASSERT(count > 1); |
| 475 | SkASSERT(SkColorGetA(c0) == 0xFF); |
| 476 | SkASSERT(SkColorGetA(c1) == 0xFF); |
| 477 | |
| 478 | SkFixed r = SkColorGetR(c0); |
| 479 | SkFixed g = SkColorGetG(c0); |
| 480 | SkFixed b = SkColorGetB(c0); |
| 481 | |
| 482 | SkFixed dr = SkIntToFixed(SkColorGetR(c1) - r) / (count - 1); |
| 483 | SkFixed dg = SkIntToFixed(SkColorGetG(c1) - g) / (count - 1); |
| 484 | SkFixed db = SkIntToFixed(SkColorGetB(c1) - b) / (count - 1); |
| 485 | |
| 486 | r = SkIntToFixed(r) + 0x8000; |
| 487 | g = SkIntToFixed(g) + 0x8000; |
| 488 | b = SkIntToFixed(b) + 0x8000; |
| 489 | |
| 490 | do { |
| 491 | unsigned rr = r >> 16; |
| 492 | unsigned gg = g >> 16; |
| 493 | unsigned bb = b >> 16; |
| 494 | cache[0] = SkPackRGB16(SkR32ToR16(rr), SkG32ToG16(gg), SkB32ToB16(bb)); |
reed@android.com | 512a876 | 2009-12-14 15:25:36 +0000 | [diff] [blame] | 495 | cache[kCache16Count] = SkDitherPack888ToRGB16(rr, gg, bb); |
reed@android.com | 8a1c16f | 2008-12-17 15:59:43 +0000 | [diff] [blame] | 496 | cache += 1; |
| 497 | r += dr; |
| 498 | g += dg; |
| 499 | b += db; |
| 500 | } while (--count != 0); |
| 501 | } |
| 502 | |
reed@google.com | 55b8e8c | 2011-01-13 16:22:35 +0000 | [diff] [blame] | 503 | /* |
| 504 | * 2x2 dither a fixed-point color component (8.16) down to 8, matching the |
| 505 | * semantics of how we 2x2 dither 32->16 |
| 506 | */ |
| 507 | static inline U8CPU dither_fixed_to_8(SkFixed n) { |
| 508 | n >>= 8; |
| 509 | return ((n << 1) - ((n >> 8 << 8) | (n >> 8))) >> 8; |
| 510 | } |
| 511 | |
| 512 | /* |
| 513 | * For dithering with premultiply, we want to ceiling the alpha component, |
| 514 | * to ensure that it is always >= any color component. |
| 515 | */ |
| 516 | static inline U8CPU dither_ceil_fixed_to_8(SkFixed n) { |
| 517 | n >>= 8; |
| 518 | return ((n << 1) - (n | (n >> 8))) >> 8; |
| 519 | } |
| 520 | |
| 521 | void Gradient_Shader::Build32bitCache(SkPMColor cache[], SkColor c0, SkColor c1, |
| 522 | int count, U8CPU paintAlpha) { |
reed@android.com | 8a1c16f | 2008-12-17 15:59:43 +0000 | [diff] [blame] | 523 | SkASSERT(count > 1); |
| 524 | |
reed@android.com | 1c12abe | 2009-07-02 15:01:02 +0000 | [diff] [blame] | 525 | // need to apply paintAlpha to our two endpoints |
| 526 | SkFixed a = SkMulDiv255Round(SkColorGetA(c0), paintAlpha); |
| 527 | SkFixed da; |
| 528 | { |
| 529 | int tmp = SkMulDiv255Round(SkColorGetA(c1), paintAlpha); |
| 530 | da = SkIntToFixed(tmp - a) / (count - 1); |
| 531 | } |
reed@android.com | 8a1c16f | 2008-12-17 15:59:43 +0000 | [diff] [blame] | 532 | |
reed@android.com | 1c12abe | 2009-07-02 15:01:02 +0000 | [diff] [blame] | 533 | SkFixed r = SkColorGetR(c0); |
| 534 | SkFixed g = SkColorGetG(c0); |
| 535 | SkFixed b = SkColorGetB(c0); |
| 536 | SkFixed dr = SkIntToFixed(SkColorGetR(c1) - r) / (count - 1); |
| 537 | SkFixed dg = SkIntToFixed(SkColorGetG(c1) - g) / (count - 1); |
| 538 | SkFixed db = SkIntToFixed(SkColorGetB(c1) - b) / (count - 1); |
reed@android.com | 8a1c16f | 2008-12-17 15:59:43 +0000 | [diff] [blame] | 539 | |
| 540 | a = SkIntToFixed(a) + 0x8000; |
| 541 | r = SkIntToFixed(r) + 0x8000; |
| 542 | g = SkIntToFixed(g) + 0x8000; |
| 543 | b = SkIntToFixed(b) + 0x8000; |
| 544 | |
| 545 | do { |
reed@google.com | 0b8b3bb | 2011-06-30 21:06:22 +0000 | [diff] [blame] | 546 | cache[0] = SkPremultiplyARGBInline(a >> 16, r >> 16, g >> 16, b >> 16); |
| 547 | cache[kCache32Count] = SkPremultiplyARGBInline(dither_ceil_fixed_to_8(a), |
| 548 | dither_fixed_to_8(r), |
| 549 | dither_fixed_to_8(g), |
| 550 | dither_fixed_to_8(b)); |
reed@google.com | 55b8e8c | 2011-01-13 16:22:35 +0000 | [diff] [blame] | 551 | cache += 1; |
reed@android.com | 8a1c16f | 2008-12-17 15:59:43 +0000 | [diff] [blame] | 552 | a += da; |
| 553 | r += dr; |
| 554 | g += dg; |
| 555 | b += db; |
| 556 | } while (--count != 0); |
| 557 | } |
| 558 | |
reed@android.com | 41bccf5 | 2009-04-03 13:33:51 +0000 | [diff] [blame] | 559 | static inline int SkFixedToFFFF(SkFixed x) { |
reed@android.com | 8a1c16f | 2008-12-17 15:59:43 +0000 | [diff] [blame] | 560 | SkASSERT((unsigned)x <= SK_Fixed1); |
| 561 | return x - (x >> 16); |
| 562 | } |
| 563 | |
reed@android.com | 200645d | 2009-12-14 16:41:57 +0000 | [diff] [blame] | 564 | static inline U16CPU bitsTo16(unsigned x, const unsigned bits) { |
reed@android.com | e191b16 | 2009-12-18 21:33:39 +0000 | [diff] [blame] | 565 | SkASSERT(x < (1U << bits)); |
reed@android.com | 200645d | 2009-12-14 16:41:57 +0000 | [diff] [blame] | 566 | if (6 == bits) { |
| 567 | return (x << 10) | (x << 4) | (x >> 2); |
| 568 | } |
| 569 | if (8 == bits) { |
| 570 | return (x << 8) | x; |
| 571 | } |
| 572 | sk_throw(); |
| 573 | return 0; |
reed@android.com | 8a1c16f | 2008-12-17 15:59:43 +0000 | [diff] [blame] | 574 | } |
| 575 | |
reed@google.com | 7c2f27d | 2011-03-07 19:29:00 +0000 | [diff] [blame] | 576 | const uint16_t* Gradient_Shader::getCache16() const { |
reed@android.com | 41bccf5 | 2009-04-03 13:33:51 +0000 | [diff] [blame] | 577 | if (fCache16 == NULL) { |
reed@google.com | 55b8e8c | 2011-01-13 16:22:35 +0000 | [diff] [blame] | 578 | // double the count for dither entries |
| 579 | const int entryCount = kCache16Count * 2; |
| 580 | const size_t allocSize = sizeof(uint16_t) * entryCount; |
| 581 | |
reed@android.com | 3c9b2a4 | 2009-08-27 19:28:37 +0000 | [diff] [blame] | 582 | if (fCache16Storage == NULL) { // set the storage and our working ptr |
reed@google.com | 55b8e8c | 2011-01-13 16:22:35 +0000 | [diff] [blame] | 583 | fCache16Storage = (uint16_t*)sk_malloc_throw(allocSize); |
reed@android.com | 3c9b2a4 | 2009-08-27 19:28:37 +0000 | [diff] [blame] | 584 | } |
reed@android.com | 8a1c16f | 2008-12-17 15:59:43 +0000 | [diff] [blame] | 585 | fCache16 = fCache16Storage; |
reed@android.com | 41bccf5 | 2009-04-03 13:33:51 +0000 | [diff] [blame] | 586 | if (fColorCount == 2) { |
reed@android.com | 512a876 | 2009-12-14 15:25:36 +0000 | [diff] [blame] | 587 | Build16bitCache(fCache16, fOrigColors[0], fOrigColors[1], kCache16Count); |
reed@android.com | 41bccf5 | 2009-04-03 13:33:51 +0000 | [diff] [blame] | 588 | } else { |
reed@android.com | 8a1c16f | 2008-12-17 15:59:43 +0000 | [diff] [blame] | 589 | Rec* rec = fRecs; |
| 590 | int prevIndex = 0; |
reed@android.com | 41bccf5 | 2009-04-03 13:33:51 +0000 | [diff] [blame] | 591 | for (int i = 1; i < fColorCount; i++) { |
reed@android.com | 512a876 | 2009-12-14 15:25:36 +0000 | [diff] [blame] | 592 | int nextIndex = SkFixedToFFFF(rec[i].fPos) >> kCache16Shift; |
reed@android.com | 8a1c16f | 2008-12-17 15:59:43 +0000 | [diff] [blame] | 593 | SkASSERT(nextIndex < kCache16Count); |
| 594 | |
| 595 | if (nextIndex > prevIndex) |
reed@android.com | 512a876 | 2009-12-14 15:25:36 +0000 | [diff] [blame] | 596 | Build16bitCache(fCache16 + prevIndex, fOrigColors[i-1], fOrigColors[i], nextIndex - prevIndex + 1); |
reed@android.com | 8a1c16f | 2008-12-17 15:59:43 +0000 | [diff] [blame] | 597 | prevIndex = nextIndex; |
| 598 | } |
| 599 | SkASSERT(prevIndex == kCache16Count - 1); |
| 600 | } |
| 601 | |
reed@android.com | 41bccf5 | 2009-04-03 13:33:51 +0000 | [diff] [blame] | 602 | if (fMapper) { |
reed@google.com | 55b8e8c | 2011-01-13 16:22:35 +0000 | [diff] [blame] | 603 | fCache16Storage = (uint16_t*)sk_malloc_throw(allocSize); |
reed@android.com | 8a1c16f | 2008-12-17 15:59:43 +0000 | [diff] [blame] | 604 | uint16_t* linear = fCache16; // just computed linear data |
| 605 | uint16_t* mapped = fCache16Storage; // storage for mapped data |
| 606 | SkUnitMapper* map = fMapper; |
reed@android.com | 200645d | 2009-12-14 16:41:57 +0000 | [diff] [blame] | 607 | for (int i = 0; i < kCache16Count; i++) { |
| 608 | int index = map->mapUnit16(bitsTo16(i, kCache16Bits)) >> kCache16Shift; |
reed@android.com | 8a1c16f | 2008-12-17 15:59:43 +0000 | [diff] [blame] | 609 | mapped[i] = linear[index]; |
reed@android.com | 200645d | 2009-12-14 16:41:57 +0000 | [diff] [blame] | 610 | mapped[i + kCache16Count] = linear[index + kCache16Count]; |
reed@android.com | 8a1c16f | 2008-12-17 15:59:43 +0000 | [diff] [blame] | 611 | } |
| 612 | sk_free(fCache16); |
| 613 | fCache16 = fCache16Storage; |
| 614 | } |
| 615 | } |
| 616 | return fCache16; |
| 617 | } |
| 618 | |
reed@google.com | 7c2f27d | 2011-03-07 19:29:00 +0000 | [diff] [blame] | 619 | const SkPMColor* Gradient_Shader::getCache32() const { |
reed@android.com | 41bccf5 | 2009-04-03 13:33:51 +0000 | [diff] [blame] | 620 | if (fCache32 == NULL) { |
reed@google.com | 55b8e8c | 2011-01-13 16:22:35 +0000 | [diff] [blame] | 621 | // double the count for dither entries |
| 622 | const int entryCount = kCache32Count * 2; |
| 623 | const size_t allocSize = sizeof(SkPMColor) * entryCount; |
| 624 | |
reed@google.com | dc731fd | 2010-12-23 15:19:47 +0000 | [diff] [blame] | 625 | if (NULL == fCache32PixelRef) { |
reed@google.com | 55b8e8c | 2011-01-13 16:22:35 +0000 | [diff] [blame] | 626 | fCache32PixelRef = SkNEW_ARGS(SkMallocPixelRef, |
| 627 | (NULL, allocSize, NULL)); |
reed@google.com | dc731fd | 2010-12-23 15:19:47 +0000 | [diff] [blame] | 628 | } |
| 629 | fCache32 = (SkPMColor*)fCache32PixelRef->getAddr(); |
reed@android.com | 41bccf5 | 2009-04-03 13:33:51 +0000 | [diff] [blame] | 630 | if (fColorCount == 2) { |
reed@google.com | 55b8e8c | 2011-01-13 16:22:35 +0000 | [diff] [blame] | 631 | Build32bitCache(fCache32, fOrigColors[0], fOrigColors[1], |
| 632 | kCache32Count, fCacheAlpha); |
reed@android.com | 41bccf5 | 2009-04-03 13:33:51 +0000 | [diff] [blame] | 633 | } else { |
reed@android.com | 8a1c16f | 2008-12-17 15:59:43 +0000 | [diff] [blame] | 634 | Rec* rec = fRecs; |
| 635 | int prevIndex = 0; |
reed@android.com | 41bccf5 | 2009-04-03 13:33:51 +0000 | [diff] [blame] | 636 | for (int i = 1; i < fColorCount; i++) { |
reed@android.com | 8a1c16f | 2008-12-17 15:59:43 +0000 | [diff] [blame] | 637 | int nextIndex = SkFixedToFFFF(rec[i].fPos) >> (16 - kCache32Bits); |
| 638 | SkASSERT(nextIndex < kCache32Count); |
| 639 | |
| 640 | if (nextIndex > prevIndex) |
reed@google.com | 55b8e8c | 2011-01-13 16:22:35 +0000 | [diff] [blame] | 641 | Build32bitCache(fCache32 + prevIndex, fOrigColors[i-1], |
| 642 | fOrigColors[i], |
| 643 | nextIndex - prevIndex + 1, fCacheAlpha); |
reed@android.com | 8a1c16f | 2008-12-17 15:59:43 +0000 | [diff] [blame] | 644 | prevIndex = nextIndex; |
| 645 | } |
| 646 | SkASSERT(prevIndex == kCache32Count - 1); |
| 647 | } |
| 648 | |
reed@android.com | 41bccf5 | 2009-04-03 13:33:51 +0000 | [diff] [blame] | 649 | if (fMapper) { |
reed@google.com | dc731fd | 2010-12-23 15:19:47 +0000 | [diff] [blame] | 650 | SkMallocPixelRef* newPR = SkNEW_ARGS(SkMallocPixelRef, |
reed@google.com | 55b8e8c | 2011-01-13 16:22:35 +0000 | [diff] [blame] | 651 | (NULL, allocSize, NULL)); |
reed@android.com | 8a1c16f | 2008-12-17 15:59:43 +0000 | [diff] [blame] | 652 | SkPMColor* linear = fCache32; // just computed linear data |
reed@google.com | dc731fd | 2010-12-23 15:19:47 +0000 | [diff] [blame] | 653 | SkPMColor* mapped = (SkPMColor*)newPR->getAddr(); // storage for mapped data |
reed@android.com | 8a1c16f | 2008-12-17 15:59:43 +0000 | [diff] [blame] | 654 | SkUnitMapper* map = fMapper; |
reed@google.com | 55b8e8c | 2011-01-13 16:22:35 +0000 | [diff] [blame] | 655 | for (int i = 0; i < kCache32Count; i++) { |
| 656 | int index = map->mapUnit16((i << 8) | i) >> 8; |
| 657 | mapped[i] = linear[index]; |
| 658 | mapped[i + kCache32Count] = linear[index + kCache32Count]; |
reed@android.com | 41bccf5 | 2009-04-03 13:33:51 +0000 | [diff] [blame] | 659 | } |
reed@google.com | dc731fd | 2010-12-23 15:19:47 +0000 | [diff] [blame] | 660 | fCache32PixelRef->unref(); |
| 661 | fCache32PixelRef = newPR; |
| 662 | fCache32 = (SkPMColor*)newPR->getAddr(); |
reed@android.com | 8a1c16f | 2008-12-17 15:59:43 +0000 | [diff] [blame] | 663 | } |
| 664 | } |
| 665 | return fCache32; |
| 666 | } |
| 667 | |
reed@google.com | dc731fd | 2010-12-23 15:19:47 +0000 | [diff] [blame] | 668 | /* |
| 669 | * Because our caller might rebuild the same (logically the same) gradient |
| 670 | * over and over, we'd like to return exactly the same "bitmap" if possible, |
| 671 | * allowing the client to utilize a cache of our bitmap (e.g. with a GPU). |
| 672 | * To do that, we maintain a private cache of built-bitmaps, based on our |
| 673 | * colors and positions. Note: we don't try to flatten the fMapper, so if one |
| 674 | * is present, we skip the cache for now. |
| 675 | */ |
reed@google.com | 7c2f27d | 2011-03-07 19:29:00 +0000 | [diff] [blame] | 676 | void Gradient_Shader::commonAsABitmap(SkBitmap* bitmap) const { |
reed@google.com | 95eed98 | 2011-07-05 17:01:56 +0000 | [diff] [blame^] | 677 | // our caller assumes no external alpha, so we ensure that our cache is |
| 678 | // built with 0xFF |
| 679 | this->setCacheAlpha(0xFF); |
| 680 | |
reed@google.com | dc731fd | 2010-12-23 15:19:47 +0000 | [diff] [blame] | 681 | // don't have a way to put the mapper into our cache-key yet |
| 682 | if (fMapper) { |
| 683 | // force our cahce32pixelref to be built |
| 684 | (void)this->getCache32(); |
| 685 | bitmap->setConfig(SkBitmap::kARGB_8888_Config, kCache32Count, 1); |
| 686 | bitmap->setPixelRef(fCache32PixelRef); |
| 687 | return; |
| 688 | } |
| 689 | |
| 690 | // build our key: [numColors + colors[] + {positions[]} ] |
| 691 | int count = 1 + fColorCount; |
| 692 | if (fColorCount > 2) { |
| 693 | count += fColorCount - 1; // fRecs[].fPos |
| 694 | } |
| 695 | |
| 696 | SkAutoSTMalloc<16, int32_t> storage(count); |
| 697 | int32_t* buffer = storage.get(); |
| 698 | |
| 699 | *buffer++ = fColorCount; |
| 700 | memcpy(buffer, fOrigColors, fColorCount * sizeof(SkColor)); |
| 701 | buffer += fColorCount; |
| 702 | if (fColorCount > 2) { |
| 703 | for (int i = 1; i < fColorCount; i++) { |
| 704 | *buffer++ = fRecs[i].fPos; |
| 705 | } |
| 706 | } |
| 707 | SkASSERT(buffer - storage.get() == count); |
| 708 | |
| 709 | /////////////////////////////////// |
| 710 | |
| 711 | static SkMutex gMutex; |
| 712 | static SkBitmapCache* gCache; |
| 713 | // each cache cost 1K of RAM, since each bitmap will be 1x256 at 32bpp |
| 714 | static const int MAX_NUM_CACHED_GRADIENT_BITMAPS = 32; |
| 715 | SkAutoMutexAcquire ama(gMutex); |
reed@google.com | 55b8e8c | 2011-01-13 16:22:35 +0000 | [diff] [blame] | 716 | |
reed@google.com | dc731fd | 2010-12-23 15:19:47 +0000 | [diff] [blame] | 717 | if (NULL == gCache) { |
| 718 | gCache = new SkBitmapCache(MAX_NUM_CACHED_GRADIENT_BITMAPS); |
| 719 | } |
| 720 | size_t size = count * sizeof(int32_t); |
| 721 | |
| 722 | if (!gCache->find(storage.get(), size, bitmap)) { |
| 723 | // force our cahce32pixelref to be built |
| 724 | (void)this->getCache32(); |
| 725 | bitmap->setConfig(SkBitmap::kARGB_8888_Config, kCache32Count, 1); |
| 726 | bitmap->setPixelRef(fCache32PixelRef); |
| 727 | |
| 728 | gCache->add(storage.get(), size, *bitmap); |
| 729 | } |
| 730 | } |
| 731 | |
vandebo@chromium.org | d3ae779 | 2011-02-24 00:21:06 +0000 | [diff] [blame] | 732 | void Gradient_Shader::commonAsAGradient(GradientInfo* info) const { |
| 733 | if (info) { |
| 734 | if (info->fColorCount >= fColorCount) { |
| 735 | if (info->fColors) { |
| 736 | memcpy(info->fColors, fOrigColors, |
| 737 | fColorCount * sizeof(SkColor)); |
| 738 | } |
| 739 | if (info->fColorOffsets) { |
| 740 | if (fColorCount == 2) { |
| 741 | info->fColorOffsets[0] = 0; |
| 742 | info->fColorOffsets[1] = SK_Scalar1; |
| 743 | } else if (fColorCount > 2) { |
| 744 | for (int i = 0; i < fColorCount; i++) |
| 745 | info->fColorOffsets[i] = SkFixedToScalar(fRecs[i].fPos); |
| 746 | } |
| 747 | } |
| 748 | } |
| 749 | info->fColorCount = fColorCount; |
| 750 | info->fTileMode = fTileMode; |
| 751 | } |
| 752 | } |
| 753 | |
reed@google.com | 61eb040 | 2011-04-15 12:11:12 +0000 | [diff] [blame] | 754 | /////////////////////////////////////////////////////////////////////////////// |
reed@android.com | 8a1c16f | 2008-12-17 15:59:43 +0000 | [diff] [blame] | 755 | |
reed@android.com | 41bccf5 | 2009-04-03 13:33:51 +0000 | [diff] [blame] | 756 | 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] | 757 | SkVector vec = pts[1] - pts[0]; |
| 758 | SkScalar mag = vec.length(); |
| 759 | SkScalar inv = mag ? SkScalarInvert(mag) : 0; |
| 760 | |
| 761 | vec.scale(inv); |
| 762 | matrix->setSinCos(-vec.fY, vec.fX, pts[0].fX, pts[0].fY); |
| 763 | matrix->postTranslate(-pts[0].fX, -pts[0].fY); |
| 764 | matrix->postScale(inv, inv); |
| 765 | } |
| 766 | |
| 767 | /////////////////////////////////////////////////////////////////////////////// |
| 768 | |
| 769 | class Linear_Gradient : public Gradient_Shader { |
| 770 | public: |
| 771 | Linear_Gradient(const SkPoint pts[2], |
| 772 | const SkColor colors[], const SkScalar pos[], int colorCount, |
| 773 | SkShader::TileMode mode, SkUnitMapper* mapper) |
vandebo@chromium.org | d3ae779 | 2011-02-24 00:21:06 +0000 | [diff] [blame] | 774 | : Gradient_Shader(colors, pos, colorCount, mode, mapper), |
| 775 | fStart(pts[0]), |
| 776 | fEnd(pts[1]) |
reed@android.com | 8a1c16f | 2008-12-17 15:59:43 +0000 | [diff] [blame] | 777 | { |
| 778 | pts_to_unit_matrix(pts, &fPtsToUnit); |
| 779 | } |
reed@android.com | 9b46e77 | 2009-06-05 12:24:41 +0000 | [diff] [blame] | 780 | |
reed@android.com | 5119bdb | 2009-06-12 21:27:03 +0000 | [diff] [blame] | 781 | virtual bool setContext(const SkBitmap&, const SkPaint&, const SkMatrix&); |
reed@android.com | 8a1c16f | 2008-12-17 15:59:43 +0000 | [diff] [blame] | 782 | virtual void shadeSpan(int x, int y, SkPMColor dstC[], int count); |
| 783 | virtual void shadeSpan16(int x, int y, uint16_t dstC[], int count); |
reed@google.com | 55b8e8c | 2011-01-13 16:22:35 +0000 | [diff] [blame] | 784 | virtual BitmapType asABitmap(SkBitmap*, SkMatrix*, |
reed@google.com | 7c2f27d | 2011-03-07 19:29:00 +0000 | [diff] [blame] | 785 | TileMode*, SkScalar* twoPointRadialParams) const; |
vandebo@chromium.org | d3ae779 | 2011-02-24 00:21:06 +0000 | [diff] [blame] | 786 | virtual GradientType asAGradient(GradientInfo* info) const; |
reed@android.com | 8a1c16f | 2008-12-17 15:59:43 +0000 | [diff] [blame] | 787 | |
reed@google.com | 55b8e8c | 2011-01-13 16:22:35 +0000 | [diff] [blame] | 788 | static SkFlattenable* CreateProc(SkFlattenableReadBuffer& buffer) { |
reed@android.com | 8a1c16f | 2008-12-17 15:59:43 +0000 | [diff] [blame] | 789 | return SkNEW_ARGS(Linear_Gradient, (buffer)); |
| 790 | } |
| 791 | |
vandebo@chromium.org | d3ae779 | 2011-02-24 00:21:06 +0000 | [diff] [blame] | 792 | virtual void flatten(SkFlattenableWriteBuffer& buffer) { |
| 793 | this->INHERITED::flatten(buffer); |
| 794 | buffer.writeScalar(fStart.fX); |
| 795 | buffer.writeScalar(fStart.fY); |
| 796 | buffer.writeScalar(fEnd.fX); |
| 797 | buffer.writeScalar(fEnd.fY); |
| 798 | } |
| 799 | |
reed@android.com | 8a1c16f | 2008-12-17 15:59:43 +0000 | [diff] [blame] | 800 | protected: |
vandebo@chromium.org | d3ae779 | 2011-02-24 00:21:06 +0000 | [diff] [blame] | 801 | Linear_Gradient(SkFlattenableReadBuffer& buffer) |
| 802 | : Gradient_Shader(buffer), |
tomhudson@google.com | 9ce767c | 2011-04-25 20:49:39 +0000 | [diff] [blame] | 803 | fStart(unflatten_point(buffer)), |
| 804 | fEnd(unflatten_point(buffer)) { |
vandebo@chromium.org | d3ae779 | 2011-02-24 00:21:06 +0000 | [diff] [blame] | 805 | } |
reed@android.com | 8a1c16f | 2008-12-17 15:59:43 +0000 | [diff] [blame] | 806 | virtual Factory getFactory() { return CreateProc; } |
| 807 | |
| 808 | private: |
| 809 | typedef Gradient_Shader INHERITED; |
vandebo@chromium.org | d3ae779 | 2011-02-24 00:21:06 +0000 | [diff] [blame] | 810 | const SkPoint fStart; |
| 811 | const SkPoint fEnd; |
reed@android.com | 8a1c16f | 2008-12-17 15:59:43 +0000 | [diff] [blame] | 812 | }; |
| 813 | |
reed@android.com | 5119bdb | 2009-06-12 21:27:03 +0000 | [diff] [blame] | 814 | bool Linear_Gradient::setContext(const SkBitmap& device, const SkPaint& paint, |
| 815 | const SkMatrix& matrix) { |
| 816 | if (!this->INHERITED::setContext(device, paint, matrix)) { |
| 817 | return false; |
| 818 | } |
| 819 | |
| 820 | unsigned mask = SkMatrix::kTranslate_Mask | SkMatrix::kScale_Mask; |
| 821 | if ((fDstToIndex.getType() & ~mask) == 0) { |
reed@android.com | 3c9b2a4 | 2009-08-27 19:28:37 +0000 | [diff] [blame] | 822 | fFlags |= SkShader::kConstInY32_Flag; |
| 823 | if ((fFlags & SkShader::kHasSpan16_Flag) && !paint.isDither()) { |
| 824 | // only claim this if we do have a 16bit mode (i.e. none of our |
| 825 | // colors have alpha), and if we are not dithering (which obviously |
| 826 | // is not const in Y). |
| 827 | fFlags |= SkShader::kConstInY16_Flag; |
| 828 | } |
reed@android.com | 5119bdb | 2009-06-12 21:27:03 +0000 | [diff] [blame] | 829 | } |
| 830 | return true; |
| 831 | } |
| 832 | |
reed@android.com | 8a1c16f | 2008-12-17 15:59:43 +0000 | [diff] [blame] | 833 | // Return true if fx, fx+dx, fx+2*dx, ... is always in range |
reed@google.com | 61eb040 | 2011-04-15 12:11:12 +0000 | [diff] [blame] | 834 | 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] | 835 | SkASSERT(count > 0); |
| 836 | return (unsigned)((fx | (fx + (count - 1) * dx)) >> 8) <= 0xFF; |
| 837 | } |
| 838 | |
reed@google.com | 5eb158d | 2011-04-15 15:50:34 +0000 | [diff] [blame] | 839 | #include "SkClampRange.h" |
| 840 | |
| 841 | #define NO_CHECK_ITER \ |
reed@google.com | 13659f1 | 2011-04-18 19:59:38 +0000 | [diff] [blame] | 842 | do { \ |
| 843 | unsigned fi = fx >> 8; \ |
reed@google.com | 5eb158d | 2011-04-15 15:50:34 +0000 | [diff] [blame] | 844 | SkASSERT(fi <= 0xFF); \ |
| 845 | fx += dx; \ |
| 846 | *dstC++ = cache[toggle + fi]; \ |
reed@google.com | 13659f1 | 2011-04-18 19:59:38 +0000 | [diff] [blame] | 847 | toggle ^= TOGGLE_MASK; \ |
| 848 | } while (0) |
reed@google.com | 5eb158d | 2011-04-15 15:50:34 +0000 | [diff] [blame] | 849 | |
| 850 | |
reed@google.com | 61eb040 | 2011-04-15 12:11:12 +0000 | [diff] [blame] | 851 | void Linear_Gradient::shadeSpan(int x, int y, SkPMColor dstC[], int count) { |
reed@android.com | 8a1c16f | 2008-12-17 15:59:43 +0000 | [diff] [blame] | 852 | SkASSERT(count > 0); |
| 853 | |
| 854 | SkPoint srcPt; |
| 855 | SkMatrix::MapXYProc dstProc = fDstToIndexProc; |
| 856 | TileProc proc = fTileProc; |
| 857 | const SkPMColor* cache = this->getCache32(); |
reed@google.com | 55b8e8c | 2011-01-13 16:22:35 +0000 | [diff] [blame] | 858 | #ifdef USE_DITHER_32BIT_GRADIENT |
| 859 | int toggle = ((x ^ y) & 1) << kCache32Bits; |
| 860 | const int TOGGLE_MASK = (1 << kCache32Bits); |
| 861 | #else |
| 862 | int toggle = 0; |
| 863 | const int TOGGLE_MASK = 0; |
| 864 | #endif |
reed@android.com | 8a1c16f | 2008-12-17 15:59:43 +0000 | [diff] [blame] | 865 | |
reed@android.com | c552a43 | 2009-06-12 20:02:50 +0000 | [diff] [blame] | 866 | if (fDstToIndexClass != kPerspective_MatrixClass) { |
reed@google.com | dc731fd | 2010-12-23 15:19:47 +0000 | [diff] [blame] | 867 | dstProc(fDstToIndex, SkIntToScalar(x) + SK_ScalarHalf, |
| 868 | SkIntToScalar(y) + SK_ScalarHalf, &srcPt); |
reed@android.com | 8a1c16f | 2008-12-17 15:59:43 +0000 | [diff] [blame] | 869 | SkFixed dx, fx = SkScalarToFixed(srcPt.fX); |
| 870 | |
reed@android.com | c552a43 | 2009-06-12 20:02:50 +0000 | [diff] [blame] | 871 | if (fDstToIndexClass == kFixedStepInX_MatrixClass) { |
reed@android.com | 8a1c16f | 2008-12-17 15:59:43 +0000 | [diff] [blame] | 872 | SkFixed dxStorage[1]; |
| 873 | (void)fDstToIndex.fixedStepInX(SkIntToScalar(y), dxStorage, NULL); |
| 874 | dx = dxStorage[0]; |
reed@android.com | c552a43 | 2009-06-12 20:02:50 +0000 | [diff] [blame] | 875 | } else { |
reed@android.com | 8a1c16f | 2008-12-17 15:59:43 +0000 | [diff] [blame] | 876 | SkASSERT(fDstToIndexClass == kLinear_MatrixClass); |
| 877 | dx = SkScalarToFixed(fDstToIndex.getScaleX()); |
| 878 | } |
| 879 | |
reed@android.com | c552a43 | 2009-06-12 20:02:50 +0000 | [diff] [blame] | 880 | if (SkFixedNearlyZero(dx)) { |
| 881 | // we're a vertical gradient, so no change in a span |
reed@android.com | 8a1c16f | 2008-12-17 15:59:43 +0000 | [diff] [blame] | 882 | unsigned fi = proc(fx); |
| 883 | SkASSERT(fi <= 0xFFFF); |
reed@google.com | 55b8e8c | 2011-01-13 16:22:35 +0000 | [diff] [blame] | 884 | // TODO: dither version |
reed@android.com | 8a1c16f | 2008-12-17 15:59:43 +0000 | [diff] [blame] | 885 | sk_memset32(dstC, cache[fi >> (16 - kCache32Bits)], count); |
reed@android.com | c552a43 | 2009-06-12 20:02:50 +0000 | [diff] [blame] | 886 | } else if (proc == clamp_tileproc) { |
reed@google.com | 1770507 | 2011-04-18 12:43:32 +0000 | [diff] [blame] | 887 | #ifdef SK_ENABLE_FAST_LINEAR_GRADIENTS |
reed@google.com | 5eb158d | 2011-04-15 15:50:34 +0000 | [diff] [blame] | 888 | SkClampRange range; |
| 889 | range.init(fx, dx, count, 0, 0xFF); |
| 890 | |
| 891 | if ((count = range.fCount0) > 0) { |
| 892 | sk_memset32_dither(dstC, |
| 893 | cache[toggle + range.fV0], |
| 894 | cache[(toggle ^ TOGGLE_MASK) + range.fV0], |
| 895 | count); |
| 896 | dstC += count; |
| 897 | } |
| 898 | if ((count = range.fCount1) > 0) { |
reed@google.com | 13659f1 | 2011-04-18 19:59:38 +0000 | [diff] [blame] | 899 | int unroll = count >> 3; |
| 900 | fx = range.fFx1; |
| 901 | for (int i = 0; i < unroll; i++) { |
reed@google.com | 5eb158d | 2011-04-15 15:50:34 +0000 | [diff] [blame] | 902 | NO_CHECK_ITER; NO_CHECK_ITER; |
| 903 | NO_CHECK_ITER; NO_CHECK_ITER; |
| 904 | NO_CHECK_ITER; NO_CHECK_ITER; |
| 905 | NO_CHECK_ITER; NO_CHECK_ITER; |
| 906 | } |
| 907 | if ((count &= 7) > 0) { |
| 908 | do { |
| 909 | NO_CHECK_ITER; |
| 910 | } while (--count != 0); |
| 911 | } |
| 912 | } |
| 913 | if ((count = range.fCount2) > 0) { |
| 914 | sk_memset32_dither(dstC, |
| 915 | cache[toggle + range.fV1], |
| 916 | cache[(toggle ^ TOGGLE_MASK) + range.fV1], |
| 917 | count); |
| 918 | } |
reed@google.com | 1770507 | 2011-04-18 12:43:32 +0000 | [diff] [blame] | 919 | #else |
| 920 | do { |
| 921 | unsigned fi = SkClampMax(fx >> 8, 0xFF); |
| 922 | SkASSERT(fi <= 0xFF); |
| 923 | fx += dx; |
| 924 | *dstC++ = cache[toggle + fi]; |
| 925 | toggle ^= TOGGLE_MASK; |
| 926 | } while (--count != 0); |
reed@google.com | 5eb158d | 2011-04-15 15:50:34 +0000 | [diff] [blame] | 927 | #endif |
reed@android.com | c552a43 | 2009-06-12 20:02:50 +0000 | [diff] [blame] | 928 | } else if (proc == mirror_tileproc) { |
reed@android.com | 8a1c16f | 2008-12-17 15:59:43 +0000 | [diff] [blame] | 929 | do { |
| 930 | unsigned fi = mirror_8bits(fx >> 8); |
| 931 | SkASSERT(fi <= 0xFF); |
| 932 | fx += dx; |
reed@google.com | 55b8e8c | 2011-01-13 16:22:35 +0000 | [diff] [blame] | 933 | *dstC++ = cache[toggle + fi]; |
| 934 | toggle ^= TOGGLE_MASK; |
reed@android.com | 8a1c16f | 2008-12-17 15:59:43 +0000 | [diff] [blame] | 935 | } while (--count != 0); |
reed@android.com | c552a43 | 2009-06-12 20:02:50 +0000 | [diff] [blame] | 936 | } else { |
reed@android.com | 8a1c16f | 2008-12-17 15:59:43 +0000 | [diff] [blame] | 937 | SkASSERT(proc == repeat_tileproc); |
| 938 | do { |
| 939 | unsigned fi = repeat_8bits(fx >> 8); |
| 940 | SkASSERT(fi <= 0xFF); |
| 941 | fx += dx; |
reed@google.com | 55b8e8c | 2011-01-13 16:22:35 +0000 | [diff] [blame] | 942 | *dstC++ = cache[toggle + fi]; |
| 943 | toggle ^= TOGGLE_MASK; |
reed@android.com | 8a1c16f | 2008-12-17 15:59:43 +0000 | [diff] [blame] | 944 | } while (--count != 0); |
| 945 | } |
reed@android.com | c552a43 | 2009-06-12 20:02:50 +0000 | [diff] [blame] | 946 | } else { |
reed@android.com | 8a1c16f | 2008-12-17 15:59:43 +0000 | [diff] [blame] | 947 | SkScalar dstX = SkIntToScalar(x); |
| 948 | SkScalar dstY = SkIntToScalar(y); |
| 949 | do { |
| 950 | dstProc(fDstToIndex, dstX, dstY, &srcPt); |
| 951 | unsigned fi = proc(SkScalarToFixed(srcPt.fX)); |
| 952 | SkASSERT(fi <= 0xFFFF); |
reed@google.com | 55b8e8c | 2011-01-13 16:22:35 +0000 | [diff] [blame] | 953 | *dstC++ = cache[toggle + (fi >> (16 - kCache32Bits))]; |
| 954 | toggle ^= TOGGLE_MASK; |
reed@android.com | 8a1c16f | 2008-12-17 15:59:43 +0000 | [diff] [blame] | 955 | dstX += SK_Scalar1; |
| 956 | } while (--count != 0); |
| 957 | } |
| 958 | } |
| 959 | |
reed@google.com | 55b8e8c | 2011-01-13 16:22:35 +0000 | [diff] [blame] | 960 | SkShader::BitmapType Linear_Gradient::asABitmap(SkBitmap* bitmap, |
reed@google.com | dc731fd | 2010-12-23 15:19:47 +0000 | [diff] [blame] | 961 | SkMatrix* matrix, |
| 962 | TileMode xy[], |
reed@google.com | 7c2f27d | 2011-03-07 19:29:00 +0000 | [diff] [blame] | 963 | SkScalar* twoPointRadialParams) const { |
reed@android.com | 8a1c16f | 2008-12-17 15:59:43 +0000 | [diff] [blame] | 964 | if (bitmap) { |
reed@google.com | dc731fd | 2010-12-23 15:19:47 +0000 | [diff] [blame] | 965 | this->commonAsABitmap(bitmap); |
reed@android.com | 8a1c16f | 2008-12-17 15:59:43 +0000 | [diff] [blame] | 966 | } |
| 967 | if (matrix) { |
| 968 | matrix->setScale(SkIntToScalar(kCache32Count), SK_Scalar1); |
| 969 | matrix->preConcat(fPtsToUnit); |
| 970 | } |
| 971 | if (xy) { |
| 972 | xy[0] = fTileMode; |
| 973 | xy[1] = kClamp_TileMode; |
| 974 | } |
reed@google.com | dc731fd | 2010-12-23 15:19:47 +0000 | [diff] [blame] | 975 | return kDefault_BitmapType; |
reed@android.com | 8a1c16f | 2008-12-17 15:59:43 +0000 | [diff] [blame] | 976 | } |
| 977 | |
vandebo@chromium.org | d3ae779 | 2011-02-24 00:21:06 +0000 | [diff] [blame] | 978 | SkShader::GradientType Linear_Gradient::asAGradient(GradientInfo* info) const { |
| 979 | if (info) { |
| 980 | commonAsAGradient(info); |
| 981 | info->fPoint[0] = fStart; |
| 982 | info->fPoint[1] = fEnd; |
| 983 | } |
| 984 | return kLinear_GradientType; |
| 985 | } |
| 986 | |
reed@android.com | 3c9b2a4 | 2009-08-27 19:28:37 +0000 | [diff] [blame] | 987 | static void dither_memset16(uint16_t dst[], uint16_t value, uint16_t other, |
| 988 | int count) { |
| 989 | if (reinterpret_cast<uintptr_t>(dst) & 2) { |
reed@android.com | 8a1c16f | 2008-12-17 15:59:43 +0000 | [diff] [blame] | 990 | *dst++ = value; |
| 991 | count -= 1; |
| 992 | SkTSwap(value, other); |
| 993 | } |
| 994 | |
| 995 | sk_memset32((uint32_t*)dst, (value << 16) | other, count >> 1); |
reed@google.com | 55b8e8c | 2011-01-13 16:22:35 +0000 | [diff] [blame] | 996 | |
reed@android.com | 3c9b2a4 | 2009-08-27 19:28:37 +0000 | [diff] [blame] | 997 | if (count & 1) { |
reed@android.com | 8a1c16f | 2008-12-17 15:59:43 +0000 | [diff] [blame] | 998 | dst[count - 1] = value; |
reed@android.com | 3c9b2a4 | 2009-08-27 19:28:37 +0000 | [diff] [blame] | 999 | } |
reed@android.com | 8a1c16f | 2008-12-17 15:59:43 +0000 | [diff] [blame] | 1000 | } |
reed@android.com | 8a1c16f | 2008-12-17 15:59:43 +0000 | [diff] [blame] | 1001 | |
reed@google.com | 5eb158d | 2011-04-15 15:50:34 +0000 | [diff] [blame] | 1002 | #define NO_CHECK_ITER_16 \ |
reed@google.com | 13659f1 | 2011-04-18 19:59:38 +0000 | [diff] [blame] | 1003 | do { \ |
| 1004 | unsigned fi = fx >> kCache16Shift; \ |
reed@google.com | 5eb158d | 2011-04-15 15:50:34 +0000 | [diff] [blame] | 1005 | SkASSERT(fi <= kCache16Mask); \ |
| 1006 | fx += dx; \ |
| 1007 | *dstC++ = cache[toggle + fi]; \ |
reed@google.com | 13659f1 | 2011-04-18 19:59:38 +0000 | [diff] [blame] | 1008 | toggle ^= TOGGLE_MASK; \ |
| 1009 | } while (0) |
reed@google.com | 5eb158d | 2011-04-15 15:50:34 +0000 | [diff] [blame] | 1010 | |
| 1011 | |
reed@google.com | 61eb040 | 2011-04-15 12:11:12 +0000 | [diff] [blame] | 1012 | void Linear_Gradient::shadeSpan16(int x, int y, uint16_t dstC[], int count) { |
reed@android.com | 8a1c16f | 2008-12-17 15:59:43 +0000 | [diff] [blame] | 1013 | SkASSERT(count > 0); |
| 1014 | |
| 1015 | SkPoint srcPt; |
| 1016 | SkMatrix::MapXYProc dstProc = fDstToIndexProc; |
| 1017 | TileProc proc = fTileProc; |
| 1018 | const uint16_t* cache = this->getCache16(); |
reed@android.com | 8a1c16f | 2008-12-17 15:59:43 +0000 | [diff] [blame] | 1019 | int toggle = ((x ^ y) & 1) << kCache16Bits; |
reed@google.com | 5eb158d | 2011-04-15 15:50:34 +0000 | [diff] [blame] | 1020 | const int TOGGLE_MASK = (1 << kCache32Bits); |
reed@android.com | 8a1c16f | 2008-12-17 15:59:43 +0000 | [diff] [blame] | 1021 | |
reed@android.com | b2c5f2d | 2009-06-12 20:09:24 +0000 | [diff] [blame] | 1022 | if (fDstToIndexClass != kPerspective_MatrixClass) { |
reed@google.com | dc731fd | 2010-12-23 15:19:47 +0000 | [diff] [blame] | 1023 | dstProc(fDstToIndex, SkIntToScalar(x) + SK_ScalarHalf, |
| 1024 | SkIntToScalar(y) + SK_ScalarHalf, &srcPt); |
reed@android.com | 8a1c16f | 2008-12-17 15:59:43 +0000 | [diff] [blame] | 1025 | SkFixed dx, fx = SkScalarToFixed(srcPt.fX); |
| 1026 | |
reed@android.com | b2c5f2d | 2009-06-12 20:09:24 +0000 | [diff] [blame] | 1027 | if (fDstToIndexClass == kFixedStepInX_MatrixClass) { |
reed@android.com | 8a1c16f | 2008-12-17 15:59:43 +0000 | [diff] [blame] | 1028 | SkFixed dxStorage[1]; |
| 1029 | (void)fDstToIndex.fixedStepInX(SkIntToScalar(y), dxStorage, NULL); |
| 1030 | dx = dxStorage[0]; |
reed@android.com | b2c5f2d | 2009-06-12 20:09:24 +0000 | [diff] [blame] | 1031 | } else { |
reed@android.com | 8a1c16f | 2008-12-17 15:59:43 +0000 | [diff] [blame] | 1032 | SkASSERT(fDstToIndexClass == kLinear_MatrixClass); |
| 1033 | dx = SkScalarToFixed(fDstToIndex.getScaleX()); |
| 1034 | } |
| 1035 | |
reed@android.com | b2c5f2d | 2009-06-12 20:09:24 +0000 | [diff] [blame] | 1036 | if (SkFixedNearlyZero(dx)) { |
| 1037 | // we're a vertical gradient, so no change in a span |
reed@android.com | 512a876 | 2009-12-14 15:25:36 +0000 | [diff] [blame] | 1038 | unsigned fi = proc(fx) >> kCache16Shift; |
| 1039 | SkASSERT(fi <= kCache16Mask); |
reed@google.com | 5eb158d | 2011-04-15 15:50:34 +0000 | [diff] [blame] | 1040 | dither_memset16(dstC, cache[toggle + fi], |
| 1041 | cache[(toggle ^ TOGGLE_MASK) + fi], count); |
reed@android.com | b2c5f2d | 2009-06-12 20:09:24 +0000 | [diff] [blame] | 1042 | } else if (proc == clamp_tileproc) { |
reed@google.com | 1770507 | 2011-04-18 12:43:32 +0000 | [diff] [blame] | 1043 | #ifdef SK_ENABLE_FAST_LINEAR_GRADIENTS |
reed@google.com | 5eb158d | 2011-04-15 15:50:34 +0000 | [diff] [blame] | 1044 | SkClampRange range; |
| 1045 | range.init(fx, dx, count, 0, kCache16Mask); |
| 1046 | |
| 1047 | if ((count = range.fCount0) > 0) { |
| 1048 | dither_memset16(dstC, |
| 1049 | cache[toggle + range.fV0], |
| 1050 | cache[(toggle ^ TOGGLE_MASK) + range.fV0], |
| 1051 | count); |
| 1052 | dstC += count; |
| 1053 | } |
| 1054 | if ((count = range.fCount1) > 0) { |
reed@google.com | 13659f1 | 2011-04-18 19:59:38 +0000 | [diff] [blame] | 1055 | int unroll = count >> 3; |
| 1056 | fx = range.fFx1; |
| 1057 | for (int i = 0; i < unroll; i++) { |
reed@google.com | 5eb158d | 2011-04-15 15:50:34 +0000 | [diff] [blame] | 1058 | NO_CHECK_ITER_16; NO_CHECK_ITER_16; |
| 1059 | NO_CHECK_ITER_16; NO_CHECK_ITER_16; |
| 1060 | NO_CHECK_ITER_16; NO_CHECK_ITER_16; |
| 1061 | NO_CHECK_ITER_16; NO_CHECK_ITER_16; |
| 1062 | } |
| 1063 | if ((count &= 7) > 0) { |
| 1064 | do { |
| 1065 | NO_CHECK_ITER_16; |
| 1066 | } while (--count != 0); |
| 1067 | } |
| 1068 | } |
| 1069 | if ((count = range.fCount2) > 0) { |
| 1070 | dither_memset16(dstC, |
| 1071 | cache[toggle + range.fV1], |
| 1072 | cache[(toggle ^ TOGGLE_MASK) + range.fV1], |
| 1073 | count); |
| 1074 | } |
reed@google.com | 1770507 | 2011-04-18 12:43:32 +0000 | [diff] [blame] | 1075 | #else |
| 1076 | do { |
| 1077 | unsigned fi = SkClampMax(fx >> kCache16Shift, kCache16Mask); |
| 1078 | SkASSERT(fi <= kCache16Mask); |
| 1079 | fx += dx; |
| 1080 | *dstC++ = cache[toggle + fi]; |
| 1081 | toggle ^= TOGGLE_MASK; |
| 1082 | } while (--count != 0); |
reed@google.com | 5eb158d | 2011-04-15 15:50:34 +0000 | [diff] [blame] | 1083 | #endif |
reed@android.com | b2c5f2d | 2009-06-12 20:09:24 +0000 | [diff] [blame] | 1084 | } else if (proc == mirror_tileproc) { |
reed@android.com | 8a1c16f | 2008-12-17 15:59:43 +0000 | [diff] [blame] | 1085 | do { |
reed@android.com | 200645d | 2009-12-14 16:41:57 +0000 | [diff] [blame] | 1086 | unsigned fi = mirror_bits(fx >> kCache16Shift, kCache16Bits); |
reed@android.com | 512a876 | 2009-12-14 15:25:36 +0000 | [diff] [blame] | 1087 | SkASSERT(fi <= kCache16Mask); |
reed@android.com | 8a1c16f | 2008-12-17 15:59:43 +0000 | [diff] [blame] | 1088 | fx += dx; |
reed@android.com | 8a1c16f | 2008-12-17 15:59:43 +0000 | [diff] [blame] | 1089 | *dstC++ = cache[toggle + fi]; |
reed@google.com | 5eb158d | 2011-04-15 15:50:34 +0000 | [diff] [blame] | 1090 | toggle ^= TOGGLE_MASK; |
reed@android.com | 8a1c16f | 2008-12-17 15:59:43 +0000 | [diff] [blame] | 1091 | } while (--count != 0); |
reed@android.com | b2c5f2d | 2009-06-12 20:09:24 +0000 | [diff] [blame] | 1092 | } else { |
reed@android.com | 8a1c16f | 2008-12-17 15:59:43 +0000 | [diff] [blame] | 1093 | SkASSERT(proc == repeat_tileproc); |
| 1094 | do { |
reed@android.com | 200645d | 2009-12-14 16:41:57 +0000 | [diff] [blame] | 1095 | unsigned fi = repeat_bits(fx >> kCache16Shift, kCache16Bits); |
reed@android.com | 512a876 | 2009-12-14 15:25:36 +0000 | [diff] [blame] | 1096 | SkASSERT(fi <= kCache16Mask); |
reed@android.com | 8a1c16f | 2008-12-17 15:59:43 +0000 | [diff] [blame] | 1097 | fx += dx; |
reed@android.com | 8a1c16f | 2008-12-17 15:59:43 +0000 | [diff] [blame] | 1098 | *dstC++ = cache[toggle + fi]; |
reed@google.com | 5eb158d | 2011-04-15 15:50:34 +0000 | [diff] [blame] | 1099 | toggle ^= TOGGLE_MASK; |
reed@android.com | 8a1c16f | 2008-12-17 15:59:43 +0000 | [diff] [blame] | 1100 | } while (--count != 0); |
| 1101 | } |
reed@android.com | b2c5f2d | 2009-06-12 20:09:24 +0000 | [diff] [blame] | 1102 | } else { |
reed@android.com | 8a1c16f | 2008-12-17 15:59:43 +0000 | [diff] [blame] | 1103 | SkScalar dstX = SkIntToScalar(x); |
| 1104 | SkScalar dstY = SkIntToScalar(y); |
| 1105 | do { |
| 1106 | dstProc(fDstToIndex, dstX, dstY, &srcPt); |
| 1107 | unsigned fi = proc(SkScalarToFixed(srcPt.fX)); |
| 1108 | SkASSERT(fi <= 0xFFFF); |
| 1109 | |
reed@android.com | 512a876 | 2009-12-14 15:25:36 +0000 | [diff] [blame] | 1110 | int index = fi >> kCache16Shift; |
reed@android.com | 8a1c16f | 2008-12-17 15:59:43 +0000 | [diff] [blame] | 1111 | *dstC++ = cache[toggle + index]; |
reed@google.com | 5eb158d | 2011-04-15 15:50:34 +0000 | [diff] [blame] | 1112 | toggle ^= TOGGLE_MASK; |
reed@android.com | 8a1c16f | 2008-12-17 15:59:43 +0000 | [diff] [blame] | 1113 | |
| 1114 | dstX += SK_Scalar1; |
| 1115 | } while (--count != 0); |
| 1116 | } |
| 1117 | } |
| 1118 | |
| 1119 | /////////////////////////////////////////////////////////////////////////////// |
| 1120 | |
| 1121 | #define kSQRT_TABLE_BITS 11 |
| 1122 | #define kSQRT_TABLE_SIZE (1 << kSQRT_TABLE_BITS) |
| 1123 | |
| 1124 | #include "SkRadialGradient_Table.h" |
| 1125 | |
| 1126 | #if defined(SK_BUILD_FOR_WIN32) && defined(SK_DEBUG) |
| 1127 | |
| 1128 | #include <stdio.h> |
| 1129 | |
reed@google.com | 61eb040 | 2011-04-15 12:11:12 +0000 | [diff] [blame] | 1130 | void SkRadialGradient_BuildTable() { |
reed@android.com | 8a1c16f | 2008-12-17 15:59:43 +0000 | [diff] [blame] | 1131 | // build it 0..127 x 0..127, so we use 2^15 - 1 in the numerator for our "fixed" table |
| 1132 | |
| 1133 | FILE* file = ::fopen("SkRadialGradient_Table.h", "w"); |
| 1134 | SkASSERT(file); |
| 1135 | ::fprintf(file, "static const uint8_t gSqrt8Table[] = {\n"); |
| 1136 | |
reed@google.com | 61eb040 | 2011-04-15 12:11:12 +0000 | [diff] [blame] | 1137 | for (int i = 0; i < kSQRT_TABLE_SIZE; i++) { |
| 1138 | if ((i & 15) == 0) { |
reed@android.com | 8a1c16f | 2008-12-17 15:59:43 +0000 | [diff] [blame] | 1139 | ::fprintf(file, "\t"); |
reed@google.com | 61eb040 | 2011-04-15 12:11:12 +0000 | [diff] [blame] | 1140 | } |
reed@android.com | 8a1c16f | 2008-12-17 15:59:43 +0000 | [diff] [blame] | 1141 | |
| 1142 | uint8_t value = SkToU8(SkFixedSqrt(i * SK_Fixed1 / kSQRT_TABLE_SIZE) >> 8); |
| 1143 | |
| 1144 | ::fprintf(file, "0x%02X", value); |
reed@google.com | 61eb040 | 2011-04-15 12:11:12 +0000 | [diff] [blame] | 1145 | if (i < kSQRT_TABLE_SIZE-1) { |
reed@android.com | 8a1c16f | 2008-12-17 15:59:43 +0000 | [diff] [blame] | 1146 | ::fprintf(file, ", "); |
reed@google.com | 61eb040 | 2011-04-15 12:11:12 +0000 | [diff] [blame] | 1147 | } |
| 1148 | if ((i & 15) == 15) { |
reed@android.com | 8a1c16f | 2008-12-17 15:59:43 +0000 | [diff] [blame] | 1149 | ::fprintf(file, "\n"); |
reed@google.com | 61eb040 | 2011-04-15 12:11:12 +0000 | [diff] [blame] | 1150 | } |
reed@android.com | 8a1c16f | 2008-12-17 15:59:43 +0000 | [diff] [blame] | 1151 | } |
| 1152 | ::fprintf(file, "};\n"); |
| 1153 | ::fclose(file); |
| 1154 | } |
| 1155 | |
| 1156 | #endif |
| 1157 | |
| 1158 | |
reed@google.com | 61eb040 | 2011-04-15 12:11:12 +0000 | [diff] [blame] | 1159 | static void rad_to_unit_matrix(const SkPoint& center, SkScalar radius, |
| 1160 | SkMatrix* matrix) { |
reed@android.com | 8a1c16f | 2008-12-17 15:59:43 +0000 | [diff] [blame] | 1161 | SkScalar inv = SkScalarInvert(radius); |
| 1162 | |
| 1163 | matrix->setTranslate(-center.fX, -center.fY); |
| 1164 | matrix->postScale(inv, inv); |
| 1165 | } |
| 1166 | |
| 1167 | class Radial_Gradient : public Gradient_Shader { |
| 1168 | public: |
| 1169 | Radial_Gradient(const SkPoint& center, SkScalar radius, |
| 1170 | const SkColor colors[], const SkScalar pos[], int colorCount, |
| 1171 | SkShader::TileMode mode, SkUnitMapper* mapper) |
vandebo@chromium.org | d3ae779 | 2011-02-24 00:21:06 +0000 | [diff] [blame] | 1172 | : Gradient_Shader(colors, pos, colorCount, mode, mapper), |
| 1173 | fCenter(center), |
| 1174 | fRadius(radius) |
reed@android.com | 8a1c16f | 2008-12-17 15:59:43 +0000 | [diff] [blame] | 1175 | { |
| 1176 | // make sure our table is insync with our current #define for kSQRT_TABLE_SIZE |
| 1177 | SkASSERT(sizeof(gSqrt8Table) == kSQRT_TABLE_SIZE); |
| 1178 | |
| 1179 | rad_to_unit_matrix(center, radius, &fPtsToUnit); |
| 1180 | } |
reed@google.com | 61eb040 | 2011-04-15 12:11:12 +0000 | [diff] [blame] | 1181 | |
| 1182 | virtual void shadeSpan(int x, int y, SkPMColor dstC[], int count) { |
reed@android.com | 8a1c16f | 2008-12-17 15:59:43 +0000 | [diff] [blame] | 1183 | SkASSERT(count > 0); |
| 1184 | |
| 1185 | SkPoint srcPt; |
| 1186 | SkMatrix::MapXYProc dstProc = fDstToIndexProc; |
| 1187 | TileProc proc = fTileProc; |
| 1188 | const SkPMColor* cache = this->getCache32(); |
| 1189 | |
reed@google.com | 61eb040 | 2011-04-15 12:11:12 +0000 | [diff] [blame] | 1190 | if (fDstToIndexClass != kPerspective_MatrixClass) { |
reed@google.com | dc731fd | 2010-12-23 15:19:47 +0000 | [diff] [blame] | 1191 | dstProc(fDstToIndex, SkIntToScalar(x) + SK_ScalarHalf, |
| 1192 | SkIntToScalar(y) + SK_ScalarHalf, &srcPt); |
reed@android.com | 8a1c16f | 2008-12-17 15:59:43 +0000 | [diff] [blame] | 1193 | SkFixed dx, fx = SkScalarToFixed(srcPt.fX); |
| 1194 | SkFixed dy, fy = SkScalarToFixed(srcPt.fY); |
| 1195 | |
reed@google.com | 61eb040 | 2011-04-15 12:11:12 +0000 | [diff] [blame] | 1196 | if (fDstToIndexClass == kFixedStepInX_MatrixClass) { |
reed@android.com | 8a1c16f | 2008-12-17 15:59:43 +0000 | [diff] [blame] | 1197 | SkFixed storage[2]; |
| 1198 | (void)fDstToIndex.fixedStepInX(SkIntToScalar(y), &storage[0], &storage[1]); |
| 1199 | dx = storage[0]; |
| 1200 | dy = storage[1]; |
reed@google.com | 61eb040 | 2011-04-15 12:11:12 +0000 | [diff] [blame] | 1201 | } else { |
reed@android.com | 8a1c16f | 2008-12-17 15:59:43 +0000 | [diff] [blame] | 1202 | SkASSERT(fDstToIndexClass == kLinear_MatrixClass); |
| 1203 | dx = SkScalarToFixed(fDstToIndex.getScaleX()); |
| 1204 | dy = SkScalarToFixed(fDstToIndex.getSkewY()); |
| 1205 | } |
| 1206 | |
reed@google.com | 61eb040 | 2011-04-15 12:11:12 +0000 | [diff] [blame] | 1207 | if (proc == clamp_tileproc) { |
reed@android.com | 8a1c16f | 2008-12-17 15:59:43 +0000 | [diff] [blame] | 1208 | const uint8_t* sqrt_table = gSqrt8Table; |
| 1209 | fx >>= 1; |
| 1210 | dx >>= 1; |
| 1211 | fy >>= 1; |
| 1212 | dy >>= 1; |
| 1213 | do { |
| 1214 | unsigned xx = SkPin32(fx, -0xFFFF >> 1, 0xFFFF >> 1); |
| 1215 | unsigned fi = SkPin32(fy, -0xFFFF >> 1, 0xFFFF >> 1); |
| 1216 | fi = (xx * xx + fi * fi) >> (14 + 16 - kSQRT_TABLE_BITS); |
| 1217 | fi = SkFastMin32(fi, 0xFFFF >> (16 - kSQRT_TABLE_BITS)); |
| 1218 | *dstC++ = cache[sqrt_table[fi] >> (8 - kCache32Bits)]; |
| 1219 | fx += dx; |
| 1220 | fy += dy; |
| 1221 | } while (--count != 0); |
reed@google.com | 61eb040 | 2011-04-15 12:11:12 +0000 | [diff] [blame] | 1222 | } else if (proc == mirror_tileproc) { |
reed@android.com | 8a1c16f | 2008-12-17 15:59:43 +0000 | [diff] [blame] | 1223 | do { |
wjmaclean@chromium.org | 1fbf760 | 2011-04-13 13:31:06 +0000 | [diff] [blame] | 1224 | SkFixed magnitudeSquared = SkFixedSquare(fx) + SkFixedSquare(fy); |
| 1225 | if (magnitudeSquared < 0) // Overflow. |
| 1226 | magnitudeSquared = SK_FixedMax; |
| 1227 | SkFixed dist = SkFixedSqrt(magnitudeSquared); |
reed@android.com | 8a1c16f | 2008-12-17 15:59:43 +0000 | [diff] [blame] | 1228 | unsigned fi = mirror_tileproc(dist); |
| 1229 | SkASSERT(fi <= 0xFFFF); |
| 1230 | *dstC++ = cache[fi >> (16 - kCache32Bits)]; |
| 1231 | fx += dx; |
| 1232 | fy += dy; |
| 1233 | } while (--count != 0); |
reed@google.com | 61eb040 | 2011-04-15 12:11:12 +0000 | [diff] [blame] | 1234 | } else { |
reed@android.com | 8a1c16f | 2008-12-17 15:59:43 +0000 | [diff] [blame] | 1235 | SkASSERT(proc == repeat_tileproc); |
| 1236 | do { |
wjmaclean@chromium.org | 1fbf760 | 2011-04-13 13:31:06 +0000 | [diff] [blame] | 1237 | SkFixed magnitudeSquared = SkFixedSquare(fx) + SkFixedSquare(fy); |
| 1238 | if (magnitudeSquared < 0) // Overflow. |
| 1239 | magnitudeSquared = SK_FixedMax; |
| 1240 | SkFixed dist = SkFixedSqrt(magnitudeSquared); |
reed@android.com | 8a1c16f | 2008-12-17 15:59:43 +0000 | [diff] [blame] | 1241 | unsigned fi = repeat_tileproc(dist); |
| 1242 | SkASSERT(fi <= 0xFFFF); |
| 1243 | *dstC++ = cache[fi >> (16 - kCache32Bits)]; |
| 1244 | fx += dx; |
| 1245 | fy += dy; |
| 1246 | } while (--count != 0); |
| 1247 | } |
reed@google.com | 61eb040 | 2011-04-15 12:11:12 +0000 | [diff] [blame] | 1248 | } else { // perspective case |
reed@android.com | 8a1c16f | 2008-12-17 15:59:43 +0000 | [diff] [blame] | 1249 | SkScalar dstX = SkIntToScalar(x); |
| 1250 | SkScalar dstY = SkIntToScalar(y); |
| 1251 | do { |
| 1252 | dstProc(fDstToIndex, dstX, dstY, &srcPt); |
| 1253 | unsigned fi = proc(SkScalarToFixed(srcPt.length())); |
| 1254 | SkASSERT(fi <= 0xFFFF); |
| 1255 | *dstC++ = cache[fi >> (16 - kCache32Bits)]; |
| 1256 | dstX += SK_Scalar1; |
| 1257 | } while (--count != 0); |
| 1258 | } |
| 1259 | } |
reed@android.com | 3c9b2a4 | 2009-08-27 19:28:37 +0000 | [diff] [blame] | 1260 | |
| 1261 | 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] | 1262 | SkASSERT(count > 0); |
| 1263 | |
| 1264 | SkPoint srcPt; |
| 1265 | SkMatrix::MapXYProc dstProc = fDstToIndexProc; |
| 1266 | TileProc proc = fTileProc; |
| 1267 | const uint16_t* cache = this->getCache16(); |
reed@android.com | 8a1c16f | 2008-12-17 15:59:43 +0000 | [diff] [blame] | 1268 | int toggle = ((x ^ y) & 1) << kCache16Bits; |
reed@android.com | 8a1c16f | 2008-12-17 15:59:43 +0000 | [diff] [blame] | 1269 | |
reed@android.com | 3c9b2a4 | 2009-08-27 19:28:37 +0000 | [diff] [blame] | 1270 | if (fDstToIndexClass != kPerspective_MatrixClass) { |
reed@google.com | dc731fd | 2010-12-23 15:19:47 +0000 | [diff] [blame] | 1271 | dstProc(fDstToIndex, SkIntToScalar(x) + SK_ScalarHalf, |
| 1272 | SkIntToScalar(y) + SK_ScalarHalf, &srcPt); |
reed@android.com | 8a1c16f | 2008-12-17 15:59:43 +0000 | [diff] [blame] | 1273 | SkFixed dx, fx = SkScalarToFixed(srcPt.fX); |
| 1274 | SkFixed dy, fy = SkScalarToFixed(srcPt.fY); |
| 1275 | |
reed@android.com | 3c9b2a4 | 2009-08-27 19:28:37 +0000 | [diff] [blame] | 1276 | if (fDstToIndexClass == kFixedStepInX_MatrixClass) { |
reed@android.com | 8a1c16f | 2008-12-17 15:59:43 +0000 | [diff] [blame] | 1277 | SkFixed storage[2]; |
| 1278 | (void)fDstToIndex.fixedStepInX(SkIntToScalar(y), &storage[0], &storage[1]); |
| 1279 | dx = storage[0]; |
| 1280 | dy = storage[1]; |
reed@android.com | 3c9b2a4 | 2009-08-27 19:28:37 +0000 | [diff] [blame] | 1281 | } else { |
reed@android.com | 8a1c16f | 2008-12-17 15:59:43 +0000 | [diff] [blame] | 1282 | SkASSERT(fDstToIndexClass == kLinear_MatrixClass); |
| 1283 | dx = SkScalarToFixed(fDstToIndex.getScaleX()); |
| 1284 | dy = SkScalarToFixed(fDstToIndex.getSkewY()); |
| 1285 | } |
| 1286 | |
reed@android.com | 3c9b2a4 | 2009-08-27 19:28:37 +0000 | [diff] [blame] | 1287 | if (proc == clamp_tileproc) { |
reed@android.com | 8a1c16f | 2008-12-17 15:59:43 +0000 | [diff] [blame] | 1288 | const uint8_t* sqrt_table = gSqrt8Table; |
| 1289 | |
| 1290 | /* knock these down so we can pin against +- 0x7FFF, which is an immediate load, |
| 1291 | rather than 0xFFFF which is slower. This is a compromise, since it reduces our |
| 1292 | precision, but that appears to be visually OK. If we decide this is OK for |
| 1293 | all of our cases, we could (it seems) put this scale-down into fDstToIndex, |
| 1294 | to avoid having to do these extra shifts each time. |
| 1295 | */ |
| 1296 | fx >>= 1; |
| 1297 | dx >>= 1; |
| 1298 | fy >>= 1; |
| 1299 | dy >>= 1; |
reed@android.com | 3c9b2a4 | 2009-08-27 19:28:37 +0000 | [diff] [blame] | 1300 | 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] | 1301 | fy = SkPin32(fy, -0xFFFF >> 1, 0xFFFF >> 1); |
| 1302 | fy *= fy; |
| 1303 | do { |
| 1304 | unsigned xx = SkPin32(fx, -0xFFFF >> 1, 0xFFFF >> 1); |
| 1305 | unsigned fi = (xx * xx + fy) >> (14 + 16 - kSQRT_TABLE_BITS); |
| 1306 | fi = SkFastMin32(fi, 0xFFFF >> (16 - kSQRT_TABLE_BITS)); |
| 1307 | fx += dx; |
reed@android.com | 8a1c16f | 2008-12-17 15:59:43 +0000 | [diff] [blame] | 1308 | *dstC++ = cache[toggle + (sqrt_table[fi] >> (8 - kCache16Bits))]; |
| 1309 | toggle ^= (1 << kCache16Bits); |
reed@android.com | 8a1c16f | 2008-12-17 15:59:43 +0000 | [diff] [blame] | 1310 | } while (--count != 0); |
reed@android.com | 3c9b2a4 | 2009-08-27 19:28:37 +0000 | [diff] [blame] | 1311 | } else { |
reed@android.com | 8a1c16f | 2008-12-17 15:59:43 +0000 | [diff] [blame] | 1312 | do { |
| 1313 | unsigned xx = SkPin32(fx, -0xFFFF >> 1, 0xFFFF >> 1); |
| 1314 | unsigned fi = SkPin32(fy, -0xFFFF >> 1, 0xFFFF >> 1); |
| 1315 | fi = (xx * xx + fi * fi) >> (14 + 16 - kSQRT_TABLE_BITS); |
| 1316 | fi = SkFastMin32(fi, 0xFFFF >> (16 - kSQRT_TABLE_BITS)); |
| 1317 | fx += dx; |
| 1318 | fy += dy; |
reed@android.com | 8a1c16f | 2008-12-17 15:59:43 +0000 | [diff] [blame] | 1319 | *dstC++ = cache[toggle + (sqrt_table[fi] >> (8 - kCache16Bits))]; |
| 1320 | toggle ^= (1 << kCache16Bits); |
reed@android.com | 8a1c16f | 2008-12-17 15:59:43 +0000 | [diff] [blame] | 1321 | } while (--count != 0); |
| 1322 | } |
reed@android.com | 3c9b2a4 | 2009-08-27 19:28:37 +0000 | [diff] [blame] | 1323 | } else if (proc == mirror_tileproc) { |
reed@android.com | 8a1c16f | 2008-12-17 15:59:43 +0000 | [diff] [blame] | 1324 | do { |
| 1325 | SkFixed dist = SkFixedSqrt(SkFixedSquare(fx) + SkFixedSquare(fy)); |
| 1326 | unsigned fi = mirror_tileproc(dist); |
| 1327 | SkASSERT(fi <= 0xFFFF); |
| 1328 | fx += dx; |
| 1329 | fy += dy; |
reed@android.com | 8a1c16f | 2008-12-17 15:59:43 +0000 | [diff] [blame] | 1330 | *dstC++ = cache[toggle + (fi >> (16 - kCache16Bits))]; |
| 1331 | toggle ^= (1 << kCache16Bits); |
reed@android.com | 8a1c16f | 2008-12-17 15:59:43 +0000 | [diff] [blame] | 1332 | } while (--count != 0); |
reed@android.com | 3c9b2a4 | 2009-08-27 19:28:37 +0000 | [diff] [blame] | 1333 | } else { |
reed@android.com | 8a1c16f | 2008-12-17 15:59:43 +0000 | [diff] [blame] | 1334 | SkASSERT(proc == repeat_tileproc); |
| 1335 | do { |
| 1336 | SkFixed dist = SkFixedSqrt(SkFixedSquare(fx) + SkFixedSquare(fy)); |
| 1337 | unsigned fi = repeat_tileproc(dist); |
| 1338 | SkASSERT(fi <= 0xFFFF); |
| 1339 | fx += dx; |
| 1340 | fy += dy; |
reed@android.com | 8a1c16f | 2008-12-17 15:59:43 +0000 | [diff] [blame] | 1341 | *dstC++ = cache[toggle + (fi >> (16 - kCache16Bits))]; |
| 1342 | toggle ^= (1 << kCache16Bits); |
reed@android.com | 8a1c16f | 2008-12-17 15:59:43 +0000 | [diff] [blame] | 1343 | } while (--count != 0); |
| 1344 | } |
reed@android.com | 3c9b2a4 | 2009-08-27 19:28:37 +0000 | [diff] [blame] | 1345 | } else { // perspective case |
reed@android.com | 8a1c16f | 2008-12-17 15:59:43 +0000 | [diff] [blame] | 1346 | SkScalar dstX = SkIntToScalar(x); |
| 1347 | SkScalar dstY = SkIntToScalar(y); |
| 1348 | do { |
| 1349 | dstProc(fDstToIndex, dstX, dstY, &srcPt); |
| 1350 | unsigned fi = proc(SkScalarToFixed(srcPt.length())); |
| 1351 | SkASSERT(fi <= 0xFFFF); |
| 1352 | |
| 1353 | int index = fi >> (16 - kCache16Bits); |
reed@android.com | 8a1c16f | 2008-12-17 15:59:43 +0000 | [diff] [blame] | 1354 | *dstC++ = cache[toggle + index]; |
| 1355 | toggle ^= (1 << kCache16Bits); |
reed@android.com | 8a1c16f | 2008-12-17 15:59:43 +0000 | [diff] [blame] | 1356 | |
| 1357 | dstX += SK_Scalar1; |
| 1358 | } while (--count != 0); |
| 1359 | } |
| 1360 | } |
| 1361 | |
reed@google.com | 55b8e8c | 2011-01-13 16:22:35 +0000 | [diff] [blame] | 1362 | virtual BitmapType asABitmap(SkBitmap* bitmap, |
| 1363 | SkMatrix* matrix, |
reed@google.com | dc731fd | 2010-12-23 15:19:47 +0000 | [diff] [blame] | 1364 | TileMode* xy, |
reed@google.com | 7c2f27d | 2011-03-07 19:29:00 +0000 | [diff] [blame] | 1365 | SkScalar* twoPointRadialParams) const { |
reed@google.com | dc731fd | 2010-12-23 15:19:47 +0000 | [diff] [blame] | 1366 | if (bitmap) { |
| 1367 | this->commonAsABitmap(bitmap); |
| 1368 | } |
| 1369 | if (matrix) { |
| 1370 | matrix->setScale(SkIntToScalar(kCache32Count), SkIntToScalar(kCache32Count)); |
| 1371 | matrix->preConcat(fPtsToUnit); |
| 1372 | } |
| 1373 | if (xy) { |
| 1374 | xy[0] = fTileMode; |
| 1375 | xy[1] = kClamp_TileMode; |
| 1376 | } |
| 1377 | return kRadial_BitmapType; |
| 1378 | } |
vandebo@chromium.org | d3ae779 | 2011-02-24 00:21:06 +0000 | [diff] [blame] | 1379 | virtual GradientType asAGradient(GradientInfo* info) const { |
| 1380 | if (info) { |
| 1381 | commonAsAGradient(info); |
| 1382 | info->fPoint[0] = fCenter; |
| 1383 | info->fRadius[0] = fRadius; |
| 1384 | } |
| 1385 | return kRadial_GradientType; |
| 1386 | } |
reed@google.com | 55b8e8c | 2011-01-13 16:22:35 +0000 | [diff] [blame] | 1387 | |
| 1388 | static SkFlattenable* CreateProc(SkFlattenableReadBuffer& buffer) { |
reed@android.com | 8a1c16f | 2008-12-17 15:59:43 +0000 | [diff] [blame] | 1389 | return SkNEW_ARGS(Radial_Gradient, (buffer)); |
| 1390 | } |
| 1391 | |
vandebo@chromium.org | d3ae779 | 2011-02-24 00:21:06 +0000 | [diff] [blame] | 1392 | virtual void flatten(SkFlattenableWriteBuffer& buffer) { |
| 1393 | this->INHERITED::flatten(buffer); |
| 1394 | buffer.writeScalar(fCenter.fX); |
| 1395 | buffer.writeScalar(fCenter.fY); |
| 1396 | buffer.writeScalar(fRadius); |
| 1397 | } |
| 1398 | |
reed@android.com | 8a1c16f | 2008-12-17 15:59:43 +0000 | [diff] [blame] | 1399 | protected: |
vandebo@chromium.org | d3ae779 | 2011-02-24 00:21:06 +0000 | [diff] [blame] | 1400 | Radial_Gradient(SkFlattenableReadBuffer& buffer) |
| 1401 | : Gradient_Shader(buffer), |
tomhudson@google.com | 9ce767c | 2011-04-25 20:49:39 +0000 | [diff] [blame] | 1402 | fCenter(unflatten_point(buffer)), |
vandebo@chromium.org | d3ae779 | 2011-02-24 00:21:06 +0000 | [diff] [blame] | 1403 | fRadius(buffer.readScalar()) { |
| 1404 | } |
reed@android.com | 8a1c16f | 2008-12-17 15:59:43 +0000 | [diff] [blame] | 1405 | virtual Factory getFactory() { return CreateProc; } |
| 1406 | |
| 1407 | private: |
| 1408 | typedef Gradient_Shader INHERITED; |
vandebo@chromium.org | d3ae779 | 2011-02-24 00:21:06 +0000 | [diff] [blame] | 1409 | const SkPoint fCenter; |
| 1410 | const SkScalar fRadius; |
reed@android.com | 8a1c16f | 2008-12-17 15:59:43 +0000 | [diff] [blame] | 1411 | }; |
| 1412 | |
senorblanco@chromium.org | 7ef071f | 2009-09-22 17:25:29 +0000 | [diff] [blame] | 1413 | /* Two-point radial gradients are specified by two circles, each with a center |
| 1414 | point and radius. The gradient can be considered to be a series of |
| 1415 | concentric circles, with the color interpolated from the start circle |
| 1416 | (at t=0) to the end circle (at t=1). |
| 1417 | |
| 1418 | For each point (x, y) in the span, we want to find the |
| 1419 | interpolated circle that intersects that point. The center |
| 1420 | of the desired circle (Cx, Cy) falls at some distance t |
| 1421 | along the line segment between the start point (Sx, Sy) and |
| 1422 | end point (Ex, Ey): |
reed@google.com | 55b8e8c | 2011-01-13 16:22:35 +0000 | [diff] [blame] | 1423 | |
senorblanco@chromium.org | 7ef071f | 2009-09-22 17:25:29 +0000 | [diff] [blame] | 1424 | Cx = (1 - t) * Sx + t * Ex (0 <= t <= 1) |
| 1425 | Cy = (1 - t) * Sy + t * Ey |
reed@google.com | 55b8e8c | 2011-01-13 16:22:35 +0000 | [diff] [blame] | 1426 | |
senorblanco@chromium.org | 7ef071f | 2009-09-22 17:25:29 +0000 | [diff] [blame] | 1427 | The radius of the desired circle (r) is also a linear interpolation t |
| 1428 | between the start and end radii (Sr and Er): |
reed@google.com | 55b8e8c | 2011-01-13 16:22:35 +0000 | [diff] [blame] | 1429 | |
senorblanco@chromium.org | 7ef071f | 2009-09-22 17:25:29 +0000 | [diff] [blame] | 1430 | r = (1 - t) * Sr + t * Er |
reed@google.com | 55b8e8c | 2011-01-13 16:22:35 +0000 | [diff] [blame] | 1431 | |
senorblanco@chromium.org | 7ef071f | 2009-09-22 17:25:29 +0000 | [diff] [blame] | 1432 | But |
reed@google.com | 55b8e8c | 2011-01-13 16:22:35 +0000 | [diff] [blame] | 1433 | |
senorblanco@chromium.org | 7ef071f | 2009-09-22 17:25:29 +0000 | [diff] [blame] | 1434 | (x - Cx)^2 + (y - Cy)^2 = r^2 |
reed@google.com | 55b8e8c | 2011-01-13 16:22:35 +0000 | [diff] [blame] | 1435 | |
senorblanco@chromium.org | 7ef071f | 2009-09-22 17:25:29 +0000 | [diff] [blame] | 1436 | so |
reed@google.com | 55b8e8c | 2011-01-13 16:22:35 +0000 | [diff] [blame] | 1437 | |
senorblanco@chromium.org | 7ef071f | 2009-09-22 17:25:29 +0000 | [diff] [blame] | 1438 | (x - ((1 - t) * Sx + t * Ex))^2 |
| 1439 | + (y - ((1 - t) * Sy + t * Ey))^2 |
| 1440 | = ((1 - t) * Sr + t * Er)^2 |
reed@google.com | 55b8e8c | 2011-01-13 16:22:35 +0000 | [diff] [blame] | 1441 | |
senorblanco@chromium.org | 7ef071f | 2009-09-22 17:25:29 +0000 | [diff] [blame] | 1442 | Solving for t yields |
reed@google.com | 55b8e8c | 2011-01-13 16:22:35 +0000 | [diff] [blame] | 1443 | |
senorblanco@chromium.org | 7ef071f | 2009-09-22 17:25:29 +0000 | [diff] [blame] | 1444 | [(Sx - Ex)^2 + (Sy - Ey)^2 - (Er - Sr)^2)] * t^2 |
| 1445 | + [2 * (Sx - Ex)(x - Sx) + 2 * (Sy - Ey)(y - Sy) - 2 * (Er - Sr) * Sr] * t |
| 1446 | + [(x - Sx)^2 + (y - Sy)^2 - Sr^2] = 0 |
reed@google.com | 55b8e8c | 2011-01-13 16:22:35 +0000 | [diff] [blame] | 1447 | |
senorblanco@chromium.org | 7ef071f | 2009-09-22 17:25:29 +0000 | [diff] [blame] | 1448 | To simplify, let Dx = Sx - Ex, Dy = Sy - Ey, Dr = Er - Sr, dx = x - Sx, dy = y - Sy |
| 1449 | |
| 1450 | [Dx^2 + Dy^2 - Dr^2)] * t^2 |
| 1451 | + 2 * [Dx * dx + Dy * dy - Dr * Sr] * t |
| 1452 | + [dx^2 + dy^2 - Sr^2] = 0 |
reed@google.com | 55b8e8c | 2011-01-13 16:22:35 +0000 | [diff] [blame] | 1453 | |
| 1454 | A quadratic in t. The two roots of the quadratic reflect the two |
senorblanco@chromium.org | 7ef071f | 2009-09-22 17:25:29 +0000 | [diff] [blame] | 1455 | possible circles on which the point may fall. Solving for t yields |
| 1456 | the gradient value to use. |
reed@google.com | 55b8e8c | 2011-01-13 16:22:35 +0000 | [diff] [blame] | 1457 | |
senorblanco@chromium.org | 7ef071f | 2009-09-22 17:25:29 +0000 | [diff] [blame] | 1458 | If a<0, the start circle is entirely contained in the |
| 1459 | end circle, and one of the roots will be <0 or >1 (off the line |
| 1460 | segment). If a>0, the start circle falls at least partially |
| 1461 | outside the end circle (or vice versa), and the gradient |
| 1462 | defines a "tube" where a point may be on one circle (on the |
| 1463 | inside of the tube) or the other (outside of the tube). We choose |
| 1464 | one arbitrarily. |
reed@google.com | 55b8e8c | 2011-01-13 16:22:35 +0000 | [diff] [blame] | 1465 | |
senorblanco@chromium.org | 7ef071f | 2009-09-22 17:25:29 +0000 | [diff] [blame] | 1466 | In order to keep the math to within the limits of fixed point, |
| 1467 | we divide the entire quadratic by Dr^2, and replace |
| 1468 | (x - Sx)/Dr with x' and (y - Sy)/Dr with y', giving |
reed@google.com | 55b8e8c | 2011-01-13 16:22:35 +0000 | [diff] [blame] | 1469 | |
senorblanco@chromium.org | 7ef071f | 2009-09-22 17:25:29 +0000 | [diff] [blame] | 1470 | [Dx^2 / Dr^2 + Dy^2 / Dr^2 - 1)] * t^2 |
| 1471 | + 2 * [x' * Dx / Dr + y' * Dy / Dr - Sr / Dr] * t |
| 1472 | + [x'^2 + y'^2 - Sr^2/Dr^2] = 0 |
reed@google.com | 55b8e8c | 2011-01-13 16:22:35 +0000 | [diff] [blame] | 1473 | |
senorblanco@chromium.org | 7ef071f | 2009-09-22 17:25:29 +0000 | [diff] [blame] | 1474 | (x' and y' are computed by appending the subtract and scale to the |
| 1475 | fDstToIndex matrix in the constructor). |
| 1476 | |
| 1477 | Since the 'A' component of the quadratic is independent of x' and y', it |
| 1478 | is precomputed in the constructor. Since the 'B' component is linear in |
| 1479 | x' and y', if x and y are linear in the span, 'B' can be computed |
reed@google.com | 55b8e8c | 2011-01-13 16:22:35 +0000 | [diff] [blame] | 1480 | incrementally with a simple delta (db below). If it is not (e.g., |
senorblanco@chromium.org | 7ef071f | 2009-09-22 17:25:29 +0000 | [diff] [blame] | 1481 | a perspective projection), it must be computed in the loop. |
| 1482 | |
| 1483 | */ |
| 1484 | |
reed@google.com | e61414c | 2011-04-15 18:14:16 +0000 | [diff] [blame] | 1485 | #ifdef SK_USE_SLOW_2POINT_RADIAL_GRADIENT |
| 1486 | static inline SkFixed two_point_radial(SkFixed b, SkFixed fx, SkFixed fy, SkFixed sr2d2, SkFixed foura, SkFixed oneOverTwoA, bool posRoot) { |
| 1487 | SkFixed c = SkFixedSquare(fx) + SkFixedSquare(fy) - sr2d2; |
reed@google.com | 8871a84 | 2011-06-23 15:07:04 +0000 | [diff] [blame] | 1488 | if (0 == foura) { |
| 1489 | return SkFixedDiv(-c, b); |
| 1490 | } |
reed@google.com | e61414c | 2011-04-15 18:14:16 +0000 | [diff] [blame] | 1491 | SkFixed discrim = SkFixedSquare(b) - SkFixedMul(foura, c); |
| 1492 | if (discrim < 0) { |
| 1493 | discrim = -discrim; |
| 1494 | } |
| 1495 | SkFixed rootDiscrim = SkFixedSqrt(discrim); |
| 1496 | if (posRoot) { |
| 1497 | return SkFixedMul(-b + rootDiscrim, oneOverTwoA); |
| 1498 | } else { |
| 1499 | return SkFixedMul(-b - rootDiscrim, oneOverTwoA); |
| 1500 | } |
| 1501 | } |
| 1502 | #else |
reed@google.com | 84e9c08 | 2011-04-13 17:44:24 +0000 | [diff] [blame] | 1503 | static inline SkFixed two_point_radial(SkScalar b, SkScalar fx, SkScalar fy, |
| 1504 | SkScalar sr2d2, SkScalar foura, |
| 1505 | SkScalar oneOverTwoA, bool posRoot) { |
| 1506 | SkScalar c = SkScalarSquare(fx) + SkScalarSquare(fy) - sr2d2; |
reed@google.com | 8871a84 | 2011-06-23 15:07:04 +0000 | [diff] [blame] | 1507 | if (0 == foura) { |
| 1508 | return SkScalarToFixed(SkScalarDiv(-c, b)); |
| 1509 | } |
| 1510 | |
reed@google.com | 84e9c08 | 2011-04-13 17:44:24 +0000 | [diff] [blame] | 1511 | SkScalar discrim = SkScalarSquare(b) - SkScalarMul(foura, c); |
senorblanco@chromium.org | 7ef071f | 2009-09-22 17:25:29 +0000 | [diff] [blame] | 1512 | if (discrim < 0) { |
| 1513 | discrim = -discrim; |
| 1514 | } |
reed@google.com | 84e9c08 | 2011-04-13 17:44:24 +0000 | [diff] [blame] | 1515 | SkScalar rootDiscrim = SkScalarSqrt(discrim); |
| 1516 | SkScalar result; |
senorblanco@chromium.org | 7ef071f | 2009-09-22 17:25:29 +0000 | [diff] [blame] | 1517 | if (posRoot) { |
reed@google.com | 84e9c08 | 2011-04-13 17:44:24 +0000 | [diff] [blame] | 1518 | result = SkScalarMul(-b + rootDiscrim, oneOverTwoA); |
senorblanco@chromium.org | 7ef071f | 2009-09-22 17:25:29 +0000 | [diff] [blame] | 1519 | } else { |
reed@google.com | 84e9c08 | 2011-04-13 17:44:24 +0000 | [diff] [blame] | 1520 | result = SkScalarMul(-b - rootDiscrim, oneOverTwoA); |
senorblanco@chromium.org | 7ef071f | 2009-09-22 17:25:29 +0000 | [diff] [blame] | 1521 | } |
reed@google.com | 84e9c08 | 2011-04-13 17:44:24 +0000 | [diff] [blame] | 1522 | return SkScalarToFixed(result); |
senorblanco@chromium.org | 7ef071f | 2009-09-22 17:25:29 +0000 | [diff] [blame] | 1523 | } |
reed@google.com | e61414c | 2011-04-15 18:14:16 +0000 | [diff] [blame] | 1524 | #endif |
senorblanco@chromium.org | 7ef071f | 2009-09-22 17:25:29 +0000 | [diff] [blame] | 1525 | |
| 1526 | class Two_Point_Radial_Gradient : public Gradient_Shader { |
| 1527 | public: |
| 1528 | Two_Point_Radial_Gradient(const SkPoint& start, SkScalar startRadius, |
| 1529 | const SkPoint& end, SkScalar endRadius, |
| 1530 | const SkColor colors[], const SkScalar pos[], |
| 1531 | int colorCount, SkShader::TileMode mode, |
| 1532 | SkUnitMapper* mapper) |
vandebo@chromium.org | d3ae779 | 2011-02-24 00:21:06 +0000 | [diff] [blame] | 1533 | : Gradient_Shader(colors, pos, colorCount, mode, mapper), |
| 1534 | fCenter1(start), |
| 1535 | fCenter2(end), |
| 1536 | fRadius1(startRadius), |
| 1537 | fRadius2(endRadius) { |
| 1538 | init(); |
senorblanco@chromium.org | 7ef071f | 2009-09-22 17:25:29 +0000 | [diff] [blame] | 1539 | } |
reed@google.com | 55b8e8c | 2011-01-13 16:22:35 +0000 | [diff] [blame] | 1540 | |
| 1541 | virtual BitmapType asABitmap(SkBitmap* bitmap, |
| 1542 | SkMatrix* matrix, |
reed@google.com | dc731fd | 2010-12-23 15:19:47 +0000 | [diff] [blame] | 1543 | TileMode* xy, |
reed@google.com | 7c2f27d | 2011-03-07 19:29:00 +0000 | [diff] [blame] | 1544 | SkScalar* twoPointRadialParams) const { |
reed@google.com | dc731fd | 2010-12-23 15:19:47 +0000 | [diff] [blame] | 1545 | if (bitmap) { |
| 1546 | this->commonAsABitmap(bitmap); |
| 1547 | } |
| 1548 | SkScalar diffL = 0; // just to avoid gcc warning |
| 1549 | if (matrix || twoPointRadialParams) { |
reed@google.com | 55b8e8c | 2011-01-13 16:22:35 +0000 | [diff] [blame] | 1550 | diffL = SkScalarSqrt(SkScalarSquare(fDiff.fX) + |
reed@google.com | dc731fd | 2010-12-23 15:19:47 +0000 | [diff] [blame] | 1551 | SkScalarSquare(fDiff.fY)); |
| 1552 | } |
| 1553 | if (matrix) { |
bsalomon@google.com | dc66c42 | 2011-04-06 19:35:37 +0000 | [diff] [blame] | 1554 | if (diffL) { |
| 1555 | SkScalar invDiffL = SkScalarInvert(diffL); |
| 1556 | matrix->setSinCos(-SkScalarMul(invDiffL, fDiff.fY), |
| 1557 | SkScalarMul(invDiffL, fDiff.fX)); |
| 1558 | } else { |
| 1559 | matrix->reset(); |
| 1560 | } |
reed@google.com | dc731fd | 2010-12-23 15:19:47 +0000 | [diff] [blame] | 1561 | matrix->preConcat(fPtsToUnit); |
| 1562 | } |
| 1563 | if (xy) { |
| 1564 | xy[0] = fTileMode; |
| 1565 | xy[1] = kClamp_TileMode; |
| 1566 | } |
| 1567 | if (NULL != twoPointRadialParams) { |
| 1568 | twoPointRadialParams[0] = diffL; |
| 1569 | twoPointRadialParams[1] = fStartRadius; |
| 1570 | twoPointRadialParams[2] = fDiffRadius; |
| 1571 | } |
| 1572 | return kTwoPointRadial_BitmapType; |
| 1573 | } |
reed@google.com | 55b8e8c | 2011-01-13 16:22:35 +0000 | [diff] [blame] | 1574 | |
vandebo@chromium.org | d3ae779 | 2011-02-24 00:21:06 +0000 | [diff] [blame] | 1575 | virtual GradientType asAGradient(GradientInfo* info) const { |
| 1576 | if (info) { |
| 1577 | commonAsAGradient(info); |
| 1578 | info->fPoint[0] = fCenter1; |
| 1579 | info->fPoint[1] = fCenter2; |
| 1580 | info->fRadius[0] = fRadius1; |
| 1581 | info->fRadius[1] = fRadius2; |
| 1582 | } |
| 1583 | return kRadial2_GradientType; |
| 1584 | } |
| 1585 | |
reed@google.com | e61414c | 2011-04-15 18:14:16 +0000 | [diff] [blame] | 1586 | #ifdef SK_USE_SLOW_2POINT_RADIAL_GRADIENT |
| 1587 | virtual void shadeSpan(int x, int y, SkPMColor dstC[], int count) |
| 1588 | { |
| 1589 | SkASSERT(count > 0); |
| 1590 | |
| 1591 | // Zero difference between radii: fill with transparent black. |
| 1592 | if (fDiffRadius == 0) { |
| 1593 | sk_bzero(dstC, count * sizeof(*dstC)); |
| 1594 | return; |
| 1595 | } |
| 1596 | SkMatrix::MapXYProc dstProc = fDstToIndexProc; |
| 1597 | TileProc proc = fTileProc; |
| 1598 | const SkPMColor* cache = this->getCache32(); |
| 1599 | SkFixed diffx = SkScalarToFixed(fDiff.fX); |
| 1600 | SkFixed diffy = SkScalarToFixed(fDiff.fY); |
| 1601 | SkFixed foura = SkScalarToFixed(SkScalarMul(fA, 4)); |
| 1602 | SkFixed startRadius = SkScalarToFixed(fStartRadius); |
| 1603 | SkFixed sr2D2 = SkScalarToFixed(fSr2D2); |
| 1604 | SkFixed oneOverTwoA = SkScalarToFixed(fOneOverTwoA); |
| 1605 | bool posRoot = fDiffRadius < 0; |
| 1606 | if (fDstToIndexClass != kPerspective_MatrixClass) |
| 1607 | { |
| 1608 | SkPoint srcPt; |
| 1609 | dstProc(fDstToIndex, SkIntToScalar(x) + SK_ScalarHalf, |
| 1610 | SkIntToScalar(y) + SK_ScalarHalf, &srcPt); |
| 1611 | SkFixed dx, fx = SkScalarToFixed(srcPt.fX); |
| 1612 | SkFixed dy, fy = SkScalarToFixed(srcPt.fY); |
| 1613 | |
| 1614 | if (fDstToIndexClass == kFixedStepInX_MatrixClass) |
| 1615 | { |
| 1616 | (void)fDstToIndex.fixedStepInX(SkIntToScalar(y), &dx, &dy); |
| 1617 | } |
| 1618 | else |
| 1619 | { |
| 1620 | SkASSERT(fDstToIndexClass == kLinear_MatrixClass); |
| 1621 | dx = SkScalarToFixed(fDstToIndex.getScaleX()); |
| 1622 | dy = SkScalarToFixed(fDstToIndex.getSkewY()); |
| 1623 | } |
| 1624 | SkFixed b = (SkFixedMul(diffx, fx) + |
| 1625 | SkFixedMul(diffy, fy) - startRadius) << 1; |
| 1626 | SkFixed db = (SkFixedMul(diffx, dx) + |
| 1627 | SkFixedMul(diffy, dy)) << 1; |
| 1628 | if (proc == clamp_tileproc) |
| 1629 | { |
| 1630 | for (; count > 0; --count) { |
| 1631 | SkFixed t = two_point_radial(b, fx, fy, sr2D2, foura, oneOverTwoA, posRoot); |
| 1632 | SkFixed index = SkClampMax(t, 0xFFFF); |
| 1633 | SkASSERT(index <= 0xFFFF); |
| 1634 | *dstC++ = cache[index >> (16 - kCache32Bits)]; |
| 1635 | fx += dx; |
| 1636 | fy += dy; |
| 1637 | b += db; |
| 1638 | } |
| 1639 | } |
| 1640 | else if (proc == mirror_tileproc) |
| 1641 | { |
| 1642 | for (; count > 0; --count) { |
| 1643 | SkFixed t = two_point_radial(b, fx, fy, sr2D2, foura, oneOverTwoA, posRoot); |
| 1644 | SkFixed index = mirror_tileproc(t); |
| 1645 | SkASSERT(index <= 0xFFFF); |
| 1646 | *dstC++ = cache[index >> (16 - kCache32Bits)]; |
| 1647 | fx += dx; |
| 1648 | fy += dy; |
| 1649 | b += db; |
| 1650 | } |
| 1651 | } |
| 1652 | else |
| 1653 | { |
| 1654 | SkASSERT(proc == repeat_tileproc); |
| 1655 | for (; count > 0; --count) { |
| 1656 | SkFixed t = two_point_radial(b, fx, fy, sr2D2, foura, oneOverTwoA, posRoot); |
| 1657 | SkFixed index = repeat_tileproc(t); |
| 1658 | SkASSERT(index <= 0xFFFF); |
| 1659 | *dstC++ = cache[index >> (16 - kCache32Bits)]; |
| 1660 | fx += dx; |
| 1661 | fy += dy; |
| 1662 | b += db; |
| 1663 | } |
| 1664 | } |
| 1665 | } |
| 1666 | else // perspective case |
| 1667 | { |
| 1668 | SkScalar dstX = SkIntToScalar(x); |
| 1669 | SkScalar dstY = SkIntToScalar(y); |
| 1670 | for (; count > 0; --count) { |
| 1671 | SkPoint srcPt; |
| 1672 | dstProc(fDstToIndex, dstX, dstY, &srcPt); |
| 1673 | SkFixed fx = SkScalarToFixed(srcPt.fX); |
| 1674 | SkFixed fy = SkScalarToFixed(srcPt.fY); |
| 1675 | SkFixed b = (SkFixedMul(diffx, fx) + |
| 1676 | SkFixedMul(diffy, fy) - startRadius) << 1; |
| 1677 | SkFixed t = two_point_radial(b, fx, fy, sr2D2, foura, oneOverTwoA, posRoot); |
| 1678 | SkFixed index = proc(t); |
| 1679 | SkASSERT(index <= 0xFFFF); |
| 1680 | *dstC++ = cache[index >> (16 - kCache32Bits)]; |
| 1681 | dstX += SK_Scalar1; |
| 1682 | } |
| 1683 | } |
| 1684 | } |
| 1685 | #else |
reed@google.com | 61eb040 | 2011-04-15 12:11:12 +0000 | [diff] [blame] | 1686 | virtual void shadeSpan(int x, int y, SkPMColor dstC[], int count) { |
senorblanco@chromium.org | 7ef071f | 2009-09-22 17:25:29 +0000 | [diff] [blame] | 1687 | SkASSERT(count > 0); |
| 1688 | |
| 1689 | // Zero difference between radii: fill with transparent black. |
| 1690 | if (fDiffRadius == 0) { |
| 1691 | sk_bzero(dstC, count * sizeof(*dstC)); |
| 1692 | return; |
| 1693 | } |
| 1694 | SkMatrix::MapXYProc dstProc = fDstToIndexProc; |
| 1695 | TileProc proc = fTileProc; |
| 1696 | const SkPMColor* cache = this->getCache32(); |
reed@google.com | 84e9c08 | 2011-04-13 17:44:24 +0000 | [diff] [blame] | 1697 | |
| 1698 | SkScalar foura = fA * 4; |
senorblanco@chromium.org | 7ef071f | 2009-09-22 17:25:29 +0000 | [diff] [blame] | 1699 | bool posRoot = fDiffRadius < 0; |
reed@google.com | 61eb040 | 2011-04-15 12:11:12 +0000 | [diff] [blame] | 1700 | if (fDstToIndexClass != kPerspective_MatrixClass) { |
senorblanco@chromium.org | 7ef071f | 2009-09-22 17:25:29 +0000 | [diff] [blame] | 1701 | SkPoint srcPt; |
reed@google.com | dc731fd | 2010-12-23 15:19:47 +0000 | [diff] [blame] | 1702 | dstProc(fDstToIndex, SkIntToScalar(x) + SK_ScalarHalf, |
| 1703 | SkIntToScalar(y) + SK_ScalarHalf, &srcPt); |
reed@google.com | 84e9c08 | 2011-04-13 17:44:24 +0000 | [diff] [blame] | 1704 | SkScalar dx, fx = srcPt.fX; |
| 1705 | SkScalar dy, fy = srcPt.fY; |
senorblanco@chromium.org | 7ef071f | 2009-09-22 17:25:29 +0000 | [diff] [blame] | 1706 | |
reed@google.com | 61eb040 | 2011-04-15 12:11:12 +0000 | [diff] [blame] | 1707 | if (fDstToIndexClass == kFixedStepInX_MatrixClass) { |
reed@google.com | 84e9c08 | 2011-04-13 17:44:24 +0000 | [diff] [blame] | 1708 | SkFixed fixedX, fixedY; |
| 1709 | (void)fDstToIndex.fixedStepInX(SkIntToScalar(y), &fixedX, &fixedY); |
| 1710 | dx = SkFixedToScalar(fixedX); |
| 1711 | dy = SkFixedToScalar(fixedY); |
reed@google.com | 61eb040 | 2011-04-15 12:11:12 +0000 | [diff] [blame] | 1712 | } else { |
senorblanco@chromium.org | 7ef071f | 2009-09-22 17:25:29 +0000 | [diff] [blame] | 1713 | SkASSERT(fDstToIndexClass == kLinear_MatrixClass); |
reed@google.com | 84e9c08 | 2011-04-13 17:44:24 +0000 | [diff] [blame] | 1714 | dx = fDstToIndex.getScaleX(); |
| 1715 | dy = fDstToIndex.getSkewY(); |
senorblanco@chromium.org | 7ef071f | 2009-09-22 17:25:29 +0000 | [diff] [blame] | 1716 | } |
reed@google.com | 84e9c08 | 2011-04-13 17:44:24 +0000 | [diff] [blame] | 1717 | SkScalar b = (SkScalarMul(fDiff.fX, fx) + |
| 1718 | SkScalarMul(fDiff.fY, fy) - fStartRadius) * 2; |
| 1719 | SkScalar db = (SkScalarMul(fDiff.fX, dx) + |
| 1720 | SkScalarMul(fDiff.fY, dy)) * 2; |
reed@google.com | 61eb040 | 2011-04-15 12:11:12 +0000 | [diff] [blame] | 1721 | if (proc == clamp_tileproc) { |
senorblanco@chromium.org | 7ef071f | 2009-09-22 17:25:29 +0000 | [diff] [blame] | 1722 | for (; count > 0; --count) { |
reed@google.com | 84e9c08 | 2011-04-13 17:44:24 +0000 | [diff] [blame] | 1723 | SkFixed t = two_point_radial(b, fx, fy, fSr2D2, foura, fOneOverTwoA, posRoot); |
senorblanco@chromium.org | 7ef071f | 2009-09-22 17:25:29 +0000 | [diff] [blame] | 1724 | SkFixed index = SkClampMax(t, 0xFFFF); |
| 1725 | SkASSERT(index <= 0xFFFF); |
| 1726 | *dstC++ = cache[index >> (16 - kCache32Bits)]; |
| 1727 | fx += dx; |
| 1728 | fy += dy; |
| 1729 | b += db; |
| 1730 | } |
reed@google.com | 61eb040 | 2011-04-15 12:11:12 +0000 | [diff] [blame] | 1731 | } else if (proc == mirror_tileproc) { |
senorblanco@chromium.org | 7ef071f | 2009-09-22 17:25:29 +0000 | [diff] [blame] | 1732 | for (; count > 0; --count) { |
reed@google.com | 84e9c08 | 2011-04-13 17:44:24 +0000 | [diff] [blame] | 1733 | SkFixed t = two_point_radial(b, fx, fy, fSr2D2, foura, fOneOverTwoA, posRoot); |
senorblanco@chromium.org | 7ef071f | 2009-09-22 17:25:29 +0000 | [diff] [blame] | 1734 | SkFixed index = mirror_tileproc(t); |
| 1735 | SkASSERT(index <= 0xFFFF); |
| 1736 | *dstC++ = cache[index >> (16 - kCache32Bits)]; |
| 1737 | fx += dx; |
| 1738 | fy += dy; |
| 1739 | b += db; |
| 1740 | } |
reed@google.com | 61eb040 | 2011-04-15 12:11:12 +0000 | [diff] [blame] | 1741 | } else { |
senorblanco@chromium.org | 7ef071f | 2009-09-22 17:25:29 +0000 | [diff] [blame] | 1742 | SkASSERT(proc == repeat_tileproc); |
| 1743 | for (; count > 0; --count) { |
reed@google.com | 84e9c08 | 2011-04-13 17:44:24 +0000 | [diff] [blame] | 1744 | SkFixed t = two_point_radial(b, fx, fy, fSr2D2, foura, fOneOverTwoA, posRoot); |
senorblanco@chromium.org | 7ef071f | 2009-09-22 17:25:29 +0000 | [diff] [blame] | 1745 | SkFixed index = repeat_tileproc(t); |
| 1746 | SkASSERT(index <= 0xFFFF); |
| 1747 | *dstC++ = cache[index >> (16 - kCache32Bits)]; |
| 1748 | fx += dx; |
| 1749 | fy += dy; |
| 1750 | b += db; |
| 1751 | } |
| 1752 | } |
reed@google.com | 61eb040 | 2011-04-15 12:11:12 +0000 | [diff] [blame] | 1753 | } else { // perspective case |
reed@android.com | 6c59a17 | 2009-09-22 20:24:05 +0000 | [diff] [blame] | 1754 | SkScalar dstX = SkIntToScalar(x); |
| 1755 | SkScalar dstY = SkIntToScalar(y); |
senorblanco@chromium.org | 7ef071f | 2009-09-22 17:25:29 +0000 | [diff] [blame] | 1756 | for (; count > 0; --count) { |
| 1757 | SkPoint srcPt; |
reed@android.com | 6c59a17 | 2009-09-22 20:24:05 +0000 | [diff] [blame] | 1758 | dstProc(fDstToIndex, dstX, dstY, &srcPt); |
reed@google.com | 84e9c08 | 2011-04-13 17:44:24 +0000 | [diff] [blame] | 1759 | SkScalar fx = srcPt.fX; |
| 1760 | SkScalar fy = srcPt.fY; |
| 1761 | SkScalar b = (SkScalarMul(fDiff.fX, fx) + |
| 1762 | SkScalarMul(fDiff.fY, fy) - fStartRadius) * 2; |
| 1763 | SkFixed t = two_point_radial(b, fx, fy, fSr2D2, foura, fOneOverTwoA, posRoot); |
senorblanco@chromium.org | 7ef071f | 2009-09-22 17:25:29 +0000 | [diff] [blame] | 1764 | SkFixed index = proc(t); |
| 1765 | SkASSERT(index <= 0xFFFF); |
| 1766 | *dstC++ = cache[index >> (16 - kCache32Bits)]; |
reed@android.com | 6c59a17 | 2009-09-22 20:24:05 +0000 | [diff] [blame] | 1767 | dstX += SK_Scalar1; |
senorblanco@chromium.org | 7ef071f | 2009-09-22 17:25:29 +0000 | [diff] [blame] | 1768 | } |
| 1769 | } |
| 1770 | } |
reed@google.com | e61414c | 2011-04-15 18:14:16 +0000 | [diff] [blame] | 1771 | #endif |
senorblanco@chromium.org | 7ef071f | 2009-09-22 17:25:29 +0000 | [diff] [blame] | 1772 | |
reed@android.com | 6c59a17 | 2009-09-22 20:24:05 +0000 | [diff] [blame] | 1773 | virtual bool setContext(const SkBitmap& device, |
| 1774 | const SkPaint& paint, |
| 1775 | const SkMatrix& matrix) { |
| 1776 | if (!this->INHERITED::setContext(device, paint, matrix)) { |
| 1777 | return false; |
| 1778 | } |
| 1779 | |
| 1780 | // we don't have a span16 proc |
| 1781 | fFlags &= ~kHasSpan16_Flag; |
| 1782 | return true; |
| 1783 | } |
| 1784 | |
reed@google.com | 55b8e8c | 2011-01-13 16:22:35 +0000 | [diff] [blame] | 1785 | static SkFlattenable* CreateProc(SkFlattenableReadBuffer& buffer) { |
senorblanco@chromium.org | 7ef071f | 2009-09-22 17:25:29 +0000 | [diff] [blame] | 1786 | return SkNEW_ARGS(Two_Point_Radial_Gradient, (buffer)); |
| 1787 | } |
| 1788 | |
reed@android.com | bcfc733 | 2009-11-10 16:19:39 +0000 | [diff] [blame] | 1789 | virtual void flatten(SkFlattenableWriteBuffer& buffer) { |
| 1790 | this->INHERITED::flatten(buffer); |
vandebo@chromium.org | d3ae779 | 2011-02-24 00:21:06 +0000 | [diff] [blame] | 1791 | buffer.writeScalar(fCenter1.fX); |
| 1792 | buffer.writeScalar(fCenter1.fY); |
| 1793 | buffer.writeScalar(fCenter2.fX); |
| 1794 | buffer.writeScalar(fCenter2.fY); |
| 1795 | buffer.writeScalar(fRadius1); |
| 1796 | buffer.writeScalar(fRadius2); |
reed@android.com | bcfc733 | 2009-11-10 16:19:39 +0000 | [diff] [blame] | 1797 | } |
reed@google.com | 55b8e8c | 2011-01-13 16:22:35 +0000 | [diff] [blame] | 1798 | |
senorblanco@chromium.org | 7ef071f | 2009-09-22 17:25:29 +0000 | [diff] [blame] | 1799 | protected: |
reed@android.com | bcfc733 | 2009-11-10 16:19:39 +0000 | [diff] [blame] | 1800 | Two_Point_Radial_Gradient(SkFlattenableReadBuffer& buffer) |
vandebo@chromium.org | d3ae779 | 2011-02-24 00:21:06 +0000 | [diff] [blame] | 1801 | : Gradient_Shader(buffer), |
tomhudson@google.com | 9ce767c | 2011-04-25 20:49:39 +0000 | [diff] [blame] | 1802 | fCenter1(unflatten_point(buffer)), |
| 1803 | fCenter2(unflatten_point(buffer)), |
vandebo@chromium.org | d3ae779 | 2011-02-24 00:21:06 +0000 | [diff] [blame] | 1804 | fRadius1(buffer.readScalar()), |
| 1805 | fRadius2(buffer.readScalar()) { |
| 1806 | init(); |
reed@android.com | bcfc733 | 2009-11-10 16:19:39 +0000 | [diff] [blame] | 1807 | }; |
senorblanco@chromium.org | 7ef071f | 2009-09-22 17:25:29 +0000 | [diff] [blame] | 1808 | virtual Factory getFactory() { return CreateProc; } |
senorblanco@chromium.org | 7ef071f | 2009-09-22 17:25:29 +0000 | [diff] [blame] | 1809 | |
| 1810 | private: |
| 1811 | typedef Gradient_Shader INHERITED; |
vandebo@chromium.org | d3ae779 | 2011-02-24 00:21:06 +0000 | [diff] [blame] | 1812 | const SkPoint fCenter1; |
| 1813 | const SkPoint fCenter2; |
| 1814 | const SkScalar fRadius1; |
| 1815 | const SkScalar fRadius2; |
senorblanco@chromium.org | 7ef071f | 2009-09-22 17:25:29 +0000 | [diff] [blame] | 1816 | SkPoint fDiff; |
| 1817 | SkScalar fStartRadius, fDiffRadius, fSr2D2, fA, fOneOverTwoA; |
vandebo@chromium.org | d3ae779 | 2011-02-24 00:21:06 +0000 | [diff] [blame] | 1818 | |
| 1819 | void init() { |
| 1820 | fDiff = fCenter1 - fCenter2; |
| 1821 | fDiffRadius = fRadius2 - fRadius1; |
| 1822 | SkScalar inv = SkScalarInvert(fDiffRadius); |
| 1823 | fDiff.fX = SkScalarMul(fDiff.fX, inv); |
| 1824 | fDiff.fY = SkScalarMul(fDiff.fY, inv); |
| 1825 | fStartRadius = SkScalarMul(fRadius1, inv); |
| 1826 | fSr2D2 = SkScalarSquare(fStartRadius); |
| 1827 | fA = SkScalarSquare(fDiff.fX) + SkScalarSquare(fDiff.fY) - SK_Scalar1; |
reed@google.com | 21031e9 | 2011-06-27 18:38:27 +0000 | [diff] [blame] | 1828 | fOneOverTwoA = fA ? SkScalarInvert(fA * 2) : 0; |
vandebo@chromium.org | d3ae779 | 2011-02-24 00:21:06 +0000 | [diff] [blame] | 1829 | |
| 1830 | fPtsToUnit.setTranslate(-fCenter1.fX, -fCenter1.fY); |
| 1831 | fPtsToUnit.postScale(inv, inv); |
| 1832 | } |
senorblanco@chromium.org | 7ef071f | 2009-09-22 17:25:29 +0000 | [diff] [blame] | 1833 | }; |
| 1834 | |
reed@android.com | 8a1c16f | 2008-12-17 15:59:43 +0000 | [diff] [blame] | 1835 | /////////////////////////////////////////////////////////////////////////////// |
| 1836 | |
| 1837 | class Sweep_Gradient : public Gradient_Shader { |
| 1838 | public: |
| 1839 | Sweep_Gradient(SkScalar cx, SkScalar cy, const SkColor colors[], |
| 1840 | const SkScalar pos[], int count, SkUnitMapper* mapper) |
vandebo@chromium.org | d3ae779 | 2011-02-24 00:21:06 +0000 | [diff] [blame] | 1841 | : Gradient_Shader(colors, pos, count, SkShader::kClamp_TileMode, mapper), |
| 1842 | fCenter(SkPoint::Make(cx, cy)) |
reed@android.com | 8a1c16f | 2008-12-17 15:59:43 +0000 | [diff] [blame] | 1843 | { |
| 1844 | fPtsToUnit.setTranslate(-cx, -cy); |
| 1845 | } |
| 1846 | virtual void shadeSpan(int x, int y, SkPMColor dstC[], int count); |
| 1847 | virtual void shadeSpan16(int x, int y, uint16_t dstC[], int count); |
reed@google.com | 55b8e8c | 2011-01-13 16:22:35 +0000 | [diff] [blame] | 1848 | |
| 1849 | virtual BitmapType asABitmap(SkBitmap* bitmap, |
| 1850 | SkMatrix* matrix, |
reed@google.com | dc731fd | 2010-12-23 15:19:47 +0000 | [diff] [blame] | 1851 | TileMode* xy, |
reed@google.com | 7c2f27d | 2011-03-07 19:29:00 +0000 | [diff] [blame] | 1852 | SkScalar* twoPointRadialParams) const { |
reed@google.com | dc731fd | 2010-12-23 15:19:47 +0000 | [diff] [blame] | 1853 | if (bitmap) { |
| 1854 | this->commonAsABitmap(bitmap); |
| 1855 | } |
| 1856 | if (matrix) { |
| 1857 | *matrix = fPtsToUnit; |
| 1858 | } |
| 1859 | if (xy) { |
| 1860 | xy[0] = fTileMode; |
| 1861 | xy[1] = kClamp_TileMode; |
| 1862 | } |
| 1863 | return kSweep_BitmapType; |
| 1864 | } |
| 1865 | |
vandebo@chromium.org | d3ae779 | 2011-02-24 00:21:06 +0000 | [diff] [blame] | 1866 | virtual GradientType asAGradient(GradientInfo* info) const { |
| 1867 | if (info) { |
| 1868 | commonAsAGradient(info); |
| 1869 | info->fPoint[0] = fCenter; |
| 1870 | } |
| 1871 | return kSweep_GradientType; |
| 1872 | } |
| 1873 | |
reed@android.com | 8a1c16f | 2008-12-17 15:59:43 +0000 | [diff] [blame] | 1874 | static SkFlattenable* CreateProc(SkFlattenableReadBuffer& buffer) { |
| 1875 | return SkNEW_ARGS(Sweep_Gradient, (buffer)); |
| 1876 | } |
| 1877 | |
vandebo@chromium.org | d3ae779 | 2011-02-24 00:21:06 +0000 | [diff] [blame] | 1878 | virtual void flatten(SkFlattenableWriteBuffer& buffer) { |
| 1879 | this->INHERITED::flatten(buffer); |
| 1880 | buffer.writeScalar(fCenter.fX); |
| 1881 | buffer.writeScalar(fCenter.fY); |
| 1882 | } |
| 1883 | |
reed@android.com | 8a1c16f | 2008-12-17 15:59:43 +0000 | [diff] [blame] | 1884 | protected: |
vandebo@chromium.org | d3ae779 | 2011-02-24 00:21:06 +0000 | [diff] [blame] | 1885 | Sweep_Gradient(SkFlattenableReadBuffer& buffer) |
| 1886 | : Gradient_Shader(buffer), |
tomhudson@google.com | 9ce767c | 2011-04-25 20:49:39 +0000 | [diff] [blame] | 1887 | fCenter(unflatten_point(buffer)) { |
vandebo@chromium.org | d3ae779 | 2011-02-24 00:21:06 +0000 | [diff] [blame] | 1888 | } |
| 1889 | |
reed@android.com | 8a1c16f | 2008-12-17 15:59:43 +0000 | [diff] [blame] | 1890 | virtual Factory getFactory() { return CreateProc; } |
| 1891 | |
| 1892 | private: |
| 1893 | typedef Gradient_Shader INHERITED; |
vandebo@chromium.org | d3ae779 | 2011-02-24 00:21:06 +0000 | [diff] [blame] | 1894 | const SkPoint fCenter; |
reed@android.com | 8a1c16f | 2008-12-17 15:59:43 +0000 | [diff] [blame] | 1895 | }; |
| 1896 | |
| 1897 | #ifdef COMPUTE_SWEEP_TABLE |
| 1898 | #define PI 3.14159265 |
| 1899 | static bool gSweepTableReady; |
| 1900 | static uint8_t gSweepTable[65]; |
| 1901 | |
| 1902 | /* Our table stores precomputed values for atan: [0...1] -> [0..PI/4] |
| 1903 | We scale the results to [0..32] |
| 1904 | */ |
reed@google.com | 61eb040 | 2011-04-15 12:11:12 +0000 | [diff] [blame] | 1905 | static const uint8_t* build_sweep_table() { |
| 1906 | if (!gSweepTableReady) { |
reed@android.com | 8a1c16f | 2008-12-17 15:59:43 +0000 | [diff] [blame] | 1907 | const int N = 65; |
| 1908 | const double DENOM = N - 1; |
reed@google.com | 55b8e8c | 2011-01-13 16:22:35 +0000 | [diff] [blame] | 1909 | |
reed@android.com | 8a1c16f | 2008-12-17 15:59:43 +0000 | [diff] [blame] | 1910 | for (int i = 0; i < N; i++) |
| 1911 | { |
| 1912 | double arg = i / DENOM; |
| 1913 | double v = atan(arg); |
| 1914 | int iv = (int)round(v * DENOM * 2 / PI); |
| 1915 | // printf("[%d] atan(%g) = %g %d\n", i, arg, v, iv); |
| 1916 | printf("%d, ", iv); |
| 1917 | gSweepTable[i] = iv; |
| 1918 | } |
| 1919 | gSweepTableReady = true; |
| 1920 | } |
| 1921 | return gSweepTable; |
| 1922 | } |
| 1923 | #else |
| 1924 | static const uint8_t gSweepTable[] = { |
| 1925 | 0, 1, 1, 2, 3, 3, 4, 4, 5, 6, 6, 7, 8, 8, 9, 9, |
| 1926 | 10, 11, 11, 12, 12, 13, 13, 14, 15, 15, 16, 16, 17, 17, 18, 18, |
| 1927 | 19, 19, 20, 20, 21, 21, 22, 22, 23, 23, 24, 24, 25, 25, 25, 26, |
| 1928 | 26, 27, 27, 27, 28, 28, 29, 29, 29, 30, 30, 30, 31, 31, 31, 32, |
| 1929 | 32 |
| 1930 | }; |
| 1931 | static const uint8_t* build_sweep_table() { return gSweepTable; } |
| 1932 | #endif |
| 1933 | |
| 1934 | // divide numer/denom, with a bias of 6bits. Assumes numer <= denom |
| 1935 | // and denom != 0. Since our table is 6bits big (+1), this is a nice fit. |
| 1936 | // Same as (but faster than) SkFixedDiv(numer, denom) >> 10 |
| 1937 | |
| 1938 | //unsigned div_64(int numer, int denom); |
reed@google.com | 61eb040 | 2011-04-15 12:11:12 +0000 | [diff] [blame] | 1939 | static unsigned div_64(int numer, int denom) { |
reed@android.com | 8a1c16f | 2008-12-17 15:59:43 +0000 | [diff] [blame] | 1940 | SkASSERT(numer <= denom); |
| 1941 | SkASSERT(numer > 0); |
| 1942 | SkASSERT(denom > 0); |
reed@google.com | 55b8e8c | 2011-01-13 16:22:35 +0000 | [diff] [blame] | 1943 | |
reed@android.com | 8a1c16f | 2008-12-17 15:59:43 +0000 | [diff] [blame] | 1944 | int nbits = SkCLZ(numer); |
| 1945 | int dbits = SkCLZ(denom); |
| 1946 | int bits = 6 - nbits + dbits; |
| 1947 | SkASSERT(bits <= 6); |
reed@google.com | 55b8e8c | 2011-01-13 16:22:35 +0000 | [diff] [blame] | 1948 | |
reed@google.com | 61eb040 | 2011-04-15 12:11:12 +0000 | [diff] [blame] | 1949 | if (bits < 0) { // detect underflow |
reed@android.com | 8a1c16f | 2008-12-17 15:59:43 +0000 | [diff] [blame] | 1950 | return 0; |
reed@google.com | 61eb040 | 2011-04-15 12:11:12 +0000 | [diff] [blame] | 1951 | } |
reed@android.com | 8a1c16f | 2008-12-17 15:59:43 +0000 | [diff] [blame] | 1952 | |
| 1953 | denom <<= dbits - 1; |
| 1954 | numer <<= nbits - 1; |
| 1955 | |
| 1956 | unsigned result = 0; |
| 1957 | |
| 1958 | // do the first one |
reed@google.com | 61eb040 | 2011-04-15 12:11:12 +0000 | [diff] [blame] | 1959 | if ((numer -= denom) >= 0) { |
reed@android.com | 8a1c16f | 2008-12-17 15:59:43 +0000 | [diff] [blame] | 1960 | result = 1; |
reed@google.com | 61eb040 | 2011-04-15 12:11:12 +0000 | [diff] [blame] | 1961 | } else { |
reed@android.com | 8a1c16f | 2008-12-17 15:59:43 +0000 | [diff] [blame] | 1962 | numer += denom; |
reed@google.com | 61eb040 | 2011-04-15 12:11:12 +0000 | [diff] [blame] | 1963 | } |
reed@google.com | 55b8e8c | 2011-01-13 16:22:35 +0000 | [diff] [blame] | 1964 | |
reed@android.com | 8a1c16f | 2008-12-17 15:59:43 +0000 | [diff] [blame] | 1965 | // Now fall into our switch statement if there are more bits to compute |
reed@google.com | 61eb040 | 2011-04-15 12:11:12 +0000 | [diff] [blame] | 1966 | if (bits > 0) { |
reed@android.com | 8a1c16f | 2008-12-17 15:59:43 +0000 | [diff] [blame] | 1967 | // make room for the rest of the answer bits |
| 1968 | result <<= bits; |
| 1969 | switch (bits) { |
| 1970 | case 6: |
| 1971 | if ((numer = (numer << 1) - denom) >= 0) |
| 1972 | result |= 32; |
| 1973 | else |
| 1974 | numer += denom; |
| 1975 | case 5: |
| 1976 | if ((numer = (numer << 1) - denom) >= 0) |
| 1977 | result |= 16; |
| 1978 | else |
| 1979 | numer += denom; |
| 1980 | case 4: |
| 1981 | if ((numer = (numer << 1) - denom) >= 0) |
| 1982 | result |= 8; |
| 1983 | else |
| 1984 | numer += denom; |
| 1985 | case 3: |
| 1986 | if ((numer = (numer << 1) - denom) >= 0) |
| 1987 | result |= 4; |
| 1988 | else |
| 1989 | numer += denom; |
| 1990 | case 2: |
| 1991 | if ((numer = (numer << 1) - denom) >= 0) |
| 1992 | result |= 2; |
| 1993 | else |
| 1994 | numer += denom; |
| 1995 | case 1: |
| 1996 | default: // not strictly need, but makes GCC make better ARM code |
| 1997 | if ((numer = (numer << 1) - denom) >= 0) |
| 1998 | result |= 1; |
| 1999 | else |
| 2000 | numer += denom; |
| 2001 | } |
| 2002 | } |
| 2003 | return result; |
| 2004 | } |
| 2005 | |
| 2006 | // Given x,y in the first quadrant, return 0..63 for the angle [0..90] |
reed@google.com | 61eb040 | 2011-04-15 12:11:12 +0000 | [diff] [blame] | 2007 | static unsigned atan_0_90(SkFixed y, SkFixed x) { |
reed@android.com | 8a1c16f | 2008-12-17 15:59:43 +0000 | [diff] [blame] | 2008 | #ifdef SK_DEBUG |
| 2009 | { |
| 2010 | static bool gOnce; |
reed@google.com | 61eb040 | 2011-04-15 12:11:12 +0000 | [diff] [blame] | 2011 | if (!gOnce) { |
reed@android.com | 8a1c16f | 2008-12-17 15:59:43 +0000 | [diff] [blame] | 2012 | gOnce = true; |
| 2013 | SkASSERT(div_64(55, 55) == 64); |
| 2014 | SkASSERT(div_64(128, 256) == 32); |
| 2015 | SkASSERT(div_64(2326528, 4685824) == 31); |
| 2016 | SkASSERT(div_64(753664, 5210112) == 9); |
| 2017 | SkASSERT(div_64(229376, 4882432) == 3); |
| 2018 | SkASSERT(div_64(2, 64) == 2); |
| 2019 | SkASSERT(div_64(1, 64) == 1); |
| 2020 | // test that we handle underflow correctly |
| 2021 | SkASSERT(div_64(12345, 0x54321234) == 0); |
| 2022 | } |
| 2023 | } |
| 2024 | #endif |
| 2025 | |
| 2026 | SkASSERT(y > 0 && x > 0); |
| 2027 | const uint8_t* table = build_sweep_table(); |
| 2028 | |
| 2029 | unsigned result; |
| 2030 | bool swap = (x < y); |
reed@google.com | 61eb040 | 2011-04-15 12:11:12 +0000 | [diff] [blame] | 2031 | if (swap) { |
reed@android.com | 8a1c16f | 2008-12-17 15:59:43 +0000 | [diff] [blame] | 2032 | // first part of the atan(v) = PI/2 - atan(1/v) identity |
| 2033 | // since our div_64 and table want v <= 1, where v = y/x |
| 2034 | SkTSwap<SkFixed>(x, y); |
| 2035 | } |
| 2036 | |
| 2037 | result = div_64(y, x); |
reed@google.com | 55b8e8c | 2011-01-13 16:22:35 +0000 | [diff] [blame] | 2038 | |
reed@android.com | 8a1c16f | 2008-12-17 15:59:43 +0000 | [diff] [blame] | 2039 | #ifdef SK_DEBUG |
| 2040 | { |
| 2041 | unsigned result2 = SkDivBits(y, x, 6); |
| 2042 | SkASSERT(result2 == result || |
| 2043 | (result == 1 && result2 == 0)); |
| 2044 | } |
| 2045 | #endif |
| 2046 | |
| 2047 | SkASSERT(result < SK_ARRAY_COUNT(gSweepTable)); |
| 2048 | result = table[result]; |
| 2049 | |
reed@google.com | 61eb040 | 2011-04-15 12:11:12 +0000 | [diff] [blame] | 2050 | if (swap) { |
reed@android.com | 8a1c16f | 2008-12-17 15:59:43 +0000 | [diff] [blame] | 2051 | // complete the atan(v) = PI/2 - atan(1/v) identity |
| 2052 | result = 64 - result; |
| 2053 | // pin to 63 |
| 2054 | result -= result >> 6; |
| 2055 | } |
| 2056 | |
| 2057 | SkASSERT(result <= 63); |
| 2058 | return result; |
| 2059 | } |
| 2060 | |
| 2061 | // returns angle in a circle [0..2PI) -> [0..255] |
reed@google.com | 61eb040 | 2011-04-15 12:11:12 +0000 | [diff] [blame] | 2062 | static unsigned SkATan2_255(SkFixed y, SkFixed x) { |
| 2063 | if (x == 0) { |
| 2064 | if (y == 0) { |
reed@android.com | 8a1c16f | 2008-12-17 15:59:43 +0000 | [diff] [blame] | 2065 | return 0; |
reed@google.com | 61eb040 | 2011-04-15 12:11:12 +0000 | [diff] [blame] | 2066 | } |
reed@android.com | 8a1c16f | 2008-12-17 15:59:43 +0000 | [diff] [blame] | 2067 | return y < 0 ? 192 : 64; |
| 2068 | } |
reed@google.com | 61eb040 | 2011-04-15 12:11:12 +0000 | [diff] [blame] | 2069 | if (y == 0) { |
reed@android.com | 8a1c16f | 2008-12-17 15:59:43 +0000 | [diff] [blame] | 2070 | return x < 0 ? 128 : 0; |
reed@google.com | 61eb040 | 2011-04-15 12:11:12 +0000 | [diff] [blame] | 2071 | } |
reed@google.com | 55b8e8c | 2011-01-13 16:22:35 +0000 | [diff] [blame] | 2072 | |
reed@android.com | 8a1c16f | 2008-12-17 15:59:43 +0000 | [diff] [blame] | 2073 | /* Find the right quadrant for x,y |
| 2074 | Since atan_0_90 only handles the first quadrant, we rotate x,y |
| 2075 | appropriately before calling it, and then add the right amount |
| 2076 | to account for the real quadrant. |
| 2077 | quadrant 0 : add 0 | x > 0 && y > 0 |
| 2078 | quadrant 1 : add 64 (90 degrees) | x < 0 && y > 0 |
| 2079 | quadrant 2 : add 128 (180 degrees) | x < 0 && y < 0 |
| 2080 | quadrant 3 : add 192 (270 degrees) | x > 0 && y < 0 |
reed@google.com | 55b8e8c | 2011-01-13 16:22:35 +0000 | [diff] [blame] | 2081 | |
reed@android.com | 8a1c16f | 2008-12-17 15:59:43 +0000 | [diff] [blame] | 2082 | map x<0 to (1 << 6) |
| 2083 | map y<0 to (3 << 6) |
| 2084 | add = map_x ^ map_y |
| 2085 | */ |
| 2086 | int xsign = x >> 31; |
| 2087 | int ysign = y >> 31; |
| 2088 | int add = ((-xsign) ^ (ysign & 3)) << 6; |
| 2089 | |
| 2090 | #ifdef SK_DEBUG |
| 2091 | if (0 == add) |
| 2092 | SkASSERT(x > 0 && y > 0); |
| 2093 | else if (64 == add) |
| 2094 | SkASSERT(x < 0 && y > 0); |
| 2095 | else if (128 == add) |
| 2096 | SkASSERT(x < 0 && y < 0); |
| 2097 | else if (192 == add) |
| 2098 | SkASSERT(x > 0 && y < 0); |
| 2099 | else |
| 2100 | SkASSERT(!"bad value for add"); |
| 2101 | #endif |
reed@google.com | 55b8e8c | 2011-01-13 16:22:35 +0000 | [diff] [blame] | 2102 | |
reed@android.com | 8a1c16f | 2008-12-17 15:59:43 +0000 | [diff] [blame] | 2103 | /* This ^ trick makes x, y positive, and the swap<> handles quadrants |
| 2104 | where we need to rotate x,y by 90 or -90 |
| 2105 | */ |
| 2106 | x = (x ^ xsign) - xsign; |
| 2107 | y = (y ^ ysign) - ysign; |
reed@google.com | 61eb040 | 2011-04-15 12:11:12 +0000 | [diff] [blame] | 2108 | if (add & 64) { // quads 1 or 3 need to swap x,y |
reed@android.com | 8a1c16f | 2008-12-17 15:59:43 +0000 | [diff] [blame] | 2109 | SkTSwap<SkFixed>(x, y); |
reed@google.com | 61eb040 | 2011-04-15 12:11:12 +0000 | [diff] [blame] | 2110 | } |
reed@android.com | 8a1c16f | 2008-12-17 15:59:43 +0000 | [diff] [blame] | 2111 | |
| 2112 | unsigned result = add + atan_0_90(y, x); |
| 2113 | SkASSERT(result < 256); |
| 2114 | return result; |
| 2115 | } |
| 2116 | |
reed@google.com | 61eb040 | 2011-04-15 12:11:12 +0000 | [diff] [blame] | 2117 | void Sweep_Gradient::shadeSpan(int x, int y, SkPMColor dstC[], int count) { |
reed@android.com | 8a1c16f | 2008-12-17 15:59:43 +0000 | [diff] [blame] | 2118 | SkMatrix::MapXYProc proc = fDstToIndexProc; |
| 2119 | const SkMatrix& matrix = fDstToIndex; |
| 2120 | const SkPMColor* cache = this->getCache32(); |
| 2121 | SkPoint srcPt; |
reed@google.com | 55b8e8c | 2011-01-13 16:22:35 +0000 | [diff] [blame] | 2122 | |
reed@google.com | 61eb040 | 2011-04-15 12:11:12 +0000 | [diff] [blame] | 2123 | if (fDstToIndexClass != kPerspective_MatrixClass) { |
reed@android.com | 8a1c16f | 2008-12-17 15:59:43 +0000 | [diff] [blame] | 2124 | proc(matrix, SkIntToScalar(x) + SK_ScalarHalf, |
| 2125 | SkIntToScalar(y) + SK_ScalarHalf, &srcPt); |
| 2126 | SkFixed dx, fx = SkScalarToFixed(srcPt.fX); |
| 2127 | SkFixed dy, fy = SkScalarToFixed(srcPt.fY); |
reed@google.com | 55b8e8c | 2011-01-13 16:22:35 +0000 | [diff] [blame] | 2128 | |
reed@google.com | 61eb040 | 2011-04-15 12:11:12 +0000 | [diff] [blame] | 2129 | if (fDstToIndexClass == kFixedStepInX_MatrixClass) { |
reed@android.com | 8a1c16f | 2008-12-17 15:59:43 +0000 | [diff] [blame] | 2130 | SkFixed storage[2]; |
| 2131 | (void)matrix.fixedStepInX(SkIntToScalar(y) + SK_ScalarHalf, |
| 2132 | &storage[0], &storage[1]); |
| 2133 | dx = storage[0]; |
| 2134 | dy = storage[1]; |
reed@google.com | 61eb040 | 2011-04-15 12:11:12 +0000 | [diff] [blame] | 2135 | } else { |
reed@android.com | 8a1c16f | 2008-12-17 15:59:43 +0000 | [diff] [blame] | 2136 | SkASSERT(fDstToIndexClass == kLinear_MatrixClass); |
| 2137 | dx = SkScalarToFixed(matrix.getScaleX()); |
| 2138 | dy = SkScalarToFixed(matrix.getSkewY()); |
| 2139 | } |
reed@google.com | 55b8e8c | 2011-01-13 16:22:35 +0000 | [diff] [blame] | 2140 | |
reed@google.com | 61eb040 | 2011-04-15 12:11:12 +0000 | [diff] [blame] | 2141 | for (; count > 0; --count) { |
reed@android.com | 8a1c16f | 2008-12-17 15:59:43 +0000 | [diff] [blame] | 2142 | *dstC++ = cache[SkATan2_255(fy, fx)]; |
| 2143 | fx += dx; |
| 2144 | fy += dy; |
| 2145 | } |
reed@google.com | 61eb040 | 2011-04-15 12:11:12 +0000 | [diff] [blame] | 2146 | } else { // perspective case |
| 2147 | for (int stop = x + count; x < stop; x++) { |
reed@android.com | 8a1c16f | 2008-12-17 15:59:43 +0000 | [diff] [blame] | 2148 | proc(matrix, SkIntToScalar(x) + SK_ScalarHalf, |
| 2149 | SkIntToScalar(y) + SK_ScalarHalf, &srcPt); |
reed@google.com | 55b8e8c | 2011-01-13 16:22:35 +0000 | [diff] [blame] | 2150 | |
reed@android.com | 8a1c16f | 2008-12-17 15:59:43 +0000 | [diff] [blame] | 2151 | int index = SkATan2_255(SkScalarToFixed(srcPt.fY), |
| 2152 | SkScalarToFixed(srcPt.fX)); |
| 2153 | *dstC++ = cache[index]; |
| 2154 | } |
| 2155 | } |
| 2156 | } |
| 2157 | |
reed@google.com | 61eb040 | 2011-04-15 12:11:12 +0000 | [diff] [blame] | 2158 | void Sweep_Gradient::shadeSpan16(int x, int y, uint16_t dstC[], int count) { |
reed@android.com | 8a1c16f | 2008-12-17 15:59:43 +0000 | [diff] [blame] | 2159 | SkMatrix::MapXYProc proc = fDstToIndexProc; |
| 2160 | const SkMatrix& matrix = fDstToIndex; |
| 2161 | const uint16_t* cache = this->getCache16(); |
| 2162 | int toggle = ((x ^ y) & 1) << kCache16Bits; |
| 2163 | SkPoint srcPt; |
| 2164 | |
reed@google.com | 61eb040 | 2011-04-15 12:11:12 +0000 | [diff] [blame] | 2165 | if (fDstToIndexClass != kPerspective_MatrixClass) { |
reed@android.com | 8a1c16f | 2008-12-17 15:59:43 +0000 | [diff] [blame] | 2166 | proc(matrix, SkIntToScalar(x) + SK_ScalarHalf, |
| 2167 | SkIntToScalar(y) + SK_ScalarHalf, &srcPt); |
| 2168 | SkFixed dx, fx = SkScalarToFixed(srcPt.fX); |
| 2169 | SkFixed dy, fy = SkScalarToFixed(srcPt.fY); |
reed@google.com | 55b8e8c | 2011-01-13 16:22:35 +0000 | [diff] [blame] | 2170 | |
reed@google.com | 61eb040 | 2011-04-15 12:11:12 +0000 | [diff] [blame] | 2171 | if (fDstToIndexClass == kFixedStepInX_MatrixClass) { |
reed@android.com | 8a1c16f | 2008-12-17 15:59:43 +0000 | [diff] [blame] | 2172 | SkFixed storage[2]; |
| 2173 | (void)matrix.fixedStepInX(SkIntToScalar(y) + SK_ScalarHalf, |
| 2174 | &storage[0], &storage[1]); |
| 2175 | dx = storage[0]; |
| 2176 | dy = storage[1]; |
reed@google.com | 61eb040 | 2011-04-15 12:11:12 +0000 | [diff] [blame] | 2177 | } else { |
reed@android.com | 8a1c16f | 2008-12-17 15:59:43 +0000 | [diff] [blame] | 2178 | SkASSERT(fDstToIndexClass == kLinear_MatrixClass); |
| 2179 | dx = SkScalarToFixed(matrix.getScaleX()); |
| 2180 | dy = SkScalarToFixed(matrix.getSkewY()); |
| 2181 | } |
reed@google.com | 55b8e8c | 2011-01-13 16:22:35 +0000 | [diff] [blame] | 2182 | |
reed@google.com | 61eb040 | 2011-04-15 12:11:12 +0000 | [diff] [blame] | 2183 | for (; count > 0; --count) { |
reed@android.com | 8a1c16f | 2008-12-17 15:59:43 +0000 | [diff] [blame] | 2184 | int index = SkATan2_255(fy, fx) >> (8 - kCache16Bits); |
| 2185 | *dstC++ = cache[toggle + index]; |
| 2186 | toggle ^= (1 << kCache16Bits); |
| 2187 | fx += dx; |
| 2188 | fy += dy; |
| 2189 | } |
reed@google.com | 61eb040 | 2011-04-15 12:11:12 +0000 | [diff] [blame] | 2190 | } else { // perspective case |
| 2191 | for (int stop = x + count; x < stop; x++) { |
reed@android.com | 8a1c16f | 2008-12-17 15:59:43 +0000 | [diff] [blame] | 2192 | proc(matrix, SkIntToScalar(x) + SK_ScalarHalf, |
| 2193 | SkIntToScalar(y) + SK_ScalarHalf, &srcPt); |
reed@google.com | 55b8e8c | 2011-01-13 16:22:35 +0000 | [diff] [blame] | 2194 | |
reed@android.com | 8a1c16f | 2008-12-17 15:59:43 +0000 | [diff] [blame] | 2195 | int index = SkATan2_255(SkScalarToFixed(srcPt.fY), |
| 2196 | SkScalarToFixed(srcPt.fX)); |
| 2197 | index >>= (8 - kCache16Bits); |
| 2198 | *dstC++ = cache[toggle + index]; |
| 2199 | toggle ^= (1 << kCache16Bits); |
| 2200 | } |
| 2201 | } |
| 2202 | } |
| 2203 | |
reed@google.com | 61eb040 | 2011-04-15 12:11:12 +0000 | [diff] [blame] | 2204 | /////////////////////////////////////////////////////////////////////////////// |
| 2205 | /////////////////////////////////////////////////////////////////////////////// |
reed@android.com | 8a1c16f | 2008-12-17 15:59:43 +0000 | [diff] [blame] | 2206 | |
| 2207 | // assumes colors is SkColor* and pos is SkScalar* |
| 2208 | #define EXPAND_1_COLOR(count) \ |
| 2209 | SkColor tmp[2]; \ |
| 2210 | do { \ |
| 2211 | if (1 == count) { \ |
| 2212 | tmp[0] = tmp[1] = colors[0]; \ |
| 2213 | colors = tmp; \ |
| 2214 | pos = NULL; \ |
| 2215 | count = 2; \ |
| 2216 | } \ |
| 2217 | } while (0) |
| 2218 | |
reed@google.com | 61eb040 | 2011-04-15 12:11:12 +0000 | [diff] [blame] | 2219 | SkShader* SkGradientShader::CreateLinear(const SkPoint pts[2], |
| 2220 | const SkColor colors[], |
| 2221 | const SkScalar pos[], int colorCount, |
| 2222 | SkShader::TileMode mode, |
| 2223 | SkUnitMapper* mapper) { |
reed@android.com | 8a1c16f | 2008-12-17 15:59:43 +0000 | [diff] [blame] | 2224 | if (NULL == pts || NULL == colors || colorCount < 1) { |
| 2225 | return NULL; |
| 2226 | } |
| 2227 | EXPAND_1_COLOR(colorCount); |
| 2228 | |
reed@android.com | ab840b8 | 2009-07-01 17:00:03 +0000 | [diff] [blame] | 2229 | return SkNEW_ARGS(Linear_Gradient, |
| 2230 | (pts, colors, pos, colorCount, mode, mapper)); |
reed@android.com | 8a1c16f | 2008-12-17 15:59:43 +0000 | [diff] [blame] | 2231 | } |
| 2232 | |
reed@google.com | 61eb040 | 2011-04-15 12:11:12 +0000 | [diff] [blame] | 2233 | SkShader* SkGradientShader::CreateRadial(const SkPoint& center, SkScalar radius, |
| 2234 | const SkColor colors[], |
| 2235 | const SkScalar pos[], int colorCount, |
| 2236 | SkShader::TileMode mode, |
| 2237 | SkUnitMapper* mapper) { |
reed@android.com | 8a1c16f | 2008-12-17 15:59:43 +0000 | [diff] [blame] | 2238 | if (radius <= 0 || NULL == colors || colorCount < 1) { |
| 2239 | return NULL; |
| 2240 | } |
| 2241 | EXPAND_1_COLOR(colorCount); |
| 2242 | |
reed@android.com | ab840b8 | 2009-07-01 17:00:03 +0000 | [diff] [blame] | 2243 | return SkNEW_ARGS(Radial_Gradient, |
| 2244 | (center, radius, colors, pos, colorCount, mode, mapper)); |
reed@android.com | 8a1c16f | 2008-12-17 15:59:43 +0000 | [diff] [blame] | 2245 | } |
| 2246 | |
senorblanco@chromium.org | 7ef071f | 2009-09-22 17:25:29 +0000 | [diff] [blame] | 2247 | SkShader* SkGradientShader::CreateTwoPointRadial(const SkPoint& start, |
| 2248 | SkScalar startRadius, |
| 2249 | const SkPoint& end, |
| 2250 | SkScalar endRadius, |
| 2251 | const SkColor colors[], |
| 2252 | const SkScalar pos[], |
| 2253 | int colorCount, |
| 2254 | SkShader::TileMode mode, |
reed@google.com | 61eb040 | 2011-04-15 12:11:12 +0000 | [diff] [blame] | 2255 | SkUnitMapper* mapper) { |
senorblanco@chromium.org | 7ef071f | 2009-09-22 17:25:29 +0000 | [diff] [blame] | 2256 | if (startRadius < 0 || endRadius < 0 || NULL == colors || colorCount < 1) { |
| 2257 | return NULL; |
| 2258 | } |
| 2259 | EXPAND_1_COLOR(colorCount); |
| 2260 | |
| 2261 | return SkNEW_ARGS(Two_Point_Radial_Gradient, |
reed@google.com | 61eb040 | 2011-04-15 12:11:12 +0000 | [diff] [blame] | 2262 | (start, startRadius, end, endRadius, colors, pos, |
| 2263 | colorCount, mode, mapper)); |
senorblanco@chromium.org | 7ef071f | 2009-09-22 17:25:29 +0000 | [diff] [blame] | 2264 | } |
| 2265 | |
reed@android.com | 8a1c16f | 2008-12-17 15:59:43 +0000 | [diff] [blame] | 2266 | SkShader* SkGradientShader::CreateSweep(SkScalar cx, SkScalar cy, |
| 2267 | const SkColor colors[], |
| 2268 | const SkScalar pos[], |
reed@google.com | 61eb040 | 2011-04-15 12:11:12 +0000 | [diff] [blame] | 2269 | int count, SkUnitMapper* mapper) { |
reed@android.com | 8a1c16f | 2008-12-17 15:59:43 +0000 | [diff] [blame] | 2270 | if (NULL == colors || count < 1) { |
| 2271 | return NULL; |
| 2272 | } |
| 2273 | EXPAND_1_COLOR(count); |
| 2274 | |
| 2275 | return SkNEW_ARGS(Sweep_Gradient, (cx, cy, colors, pos, count, mapper)); |
| 2276 | } |
| 2277 | |
| 2278 | static SkFlattenable::Registrar gLinearGradientReg("Linear_Gradient", |
| 2279 | Linear_Gradient::CreateProc); |
| 2280 | |
| 2281 | static SkFlattenable::Registrar gRadialGradientReg("Radial_Gradient", |
| 2282 | Radial_Gradient::CreateProc); |
| 2283 | |
| 2284 | static SkFlattenable::Registrar gSweepGradientReg("Sweep_Gradient", |
| 2285 | Sweep_Gradient::CreateProc); |
tomhudson@google.com | 938d604 | 2011-04-27 13:57:03 +0000 | [diff] [blame] | 2286 | |
| 2287 | static SkFlattenable::Registrar |
| 2288 | gTwoPointRadialGradientReg("Two_Point_Radial_Gradient", |
| 2289 | Two_Point_Radial_Gradient::CreateProc); |