epoger@google.com | ec3ed6a | 2011-07-28 14:26:00 +0000 | [diff] [blame] | 1 | |
| 2 | /* |
| 3 | * Copyright 2006 The Android Open Source Project |
| 4 | * |
| 5 | * Use of this source code is governed by a BSD-style license that can be |
| 6 | * found in the LICENSE file. |
| 7 | */ |
| 8 | |
reed@android.com | 8a1c16f | 2008-12-17 15:59:43 +0000 | [diff] [blame] | 9 | |
| 10 | #include "SkGradientShader.h" |
| 11 | #include "SkColorPriv.h" |
reed@google.com | dc731fd | 2010-12-23 15:19:47 +0000 | [diff] [blame] | 12 | #include "SkMallocPixelRef.h" |
reed@android.com | 8a1c16f | 2008-12-17 15:59:43 +0000 | [diff] [blame] | 13 | #include "SkUnitMapper.h" |
| 14 | #include "SkUtils.h" |
reed@google.com | dc731fd | 2010-12-23 15:19:47 +0000 | [diff] [blame] | 15 | #include "SkTemplates.h" |
| 16 | #include "SkBitmapCache.h" |
reed@android.com | 8a1c16f | 2008-12-17 15:59:43 +0000 | [diff] [blame] | 17 | |
reed@google.com | 9c7443d | 2011-01-17 18:46:37 +0000 | [diff] [blame] | 18 | #ifndef SK_DISABLE_DITHER_32BIT_GRADIENT |
| 19 | #define USE_DITHER_32BIT_GRADIENT |
| 20 | #endif |
reed@google.com | 55b8e8c | 2011-01-13 16:22:35 +0000 | [diff] [blame] | 21 | |
reed@google.com | 5eb158d | 2011-04-15 15:50:34 +0000 | [diff] [blame] | 22 | static void sk_memset32_dither(uint32_t dst[], uint32_t v0, uint32_t v1, |
| 23 | int count) { |
| 24 | if (count > 0) { |
| 25 | if (v0 == v1) { |
| 26 | sk_memset32(dst, v0, count); |
| 27 | } else { |
| 28 | int pairs = count >> 1; |
| 29 | for (int i = 0; i < pairs; i++) { |
| 30 | *dst++ = v0; |
| 31 | *dst++ = v1; |
| 32 | } |
| 33 | if (count & 1) { |
| 34 | *dst = v0; |
| 35 | } |
| 36 | } |
| 37 | } |
| 38 | } |
| 39 | |
reed@google.com | 61eb040 | 2011-04-15 12:11:12 +0000 | [diff] [blame] | 40 | /////////////////////////////////////////////////////////////////////////////// |
tomhudson@google.com | 9ce767c | 2011-04-25 20:49:39 +0000 | [diff] [blame] | 41 | // Can't use a two-argument function with side effects like this in a |
| 42 | // constructor's initializer's argument list because the order of |
| 43 | // evaluations in that context is undefined (and backwards on linux/gcc). |
| 44 | static SkPoint unflatten_point(SkReader32& buffer) { |
| 45 | SkPoint retval; |
| 46 | retval.fX = buffer.readScalar(); |
| 47 | retval.fY = buffer.readScalar(); |
| 48 | return retval; |
| 49 | } |
| 50 | |
| 51 | /////////////////////////////////////////////////////////////////////////////// |
reed@android.com | 8a1c16f | 2008-12-17 15:59:43 +0000 | [diff] [blame] | 52 | |
| 53 | typedef SkFixed (*TileProc)(SkFixed); |
| 54 | |
reed@android.com | 41bccf5 | 2009-04-03 13:33:51 +0000 | [diff] [blame] | 55 | static SkFixed clamp_tileproc(SkFixed x) { |
reed@android.com | 8a1c16f | 2008-12-17 15:59:43 +0000 | [diff] [blame] | 56 | return SkClampMax(x, 0xFFFF); |
| 57 | } |
| 58 | |
reed@android.com | 41bccf5 | 2009-04-03 13:33:51 +0000 | [diff] [blame] | 59 | static SkFixed repeat_tileproc(SkFixed x) { |
reed@android.com | 8a1c16f | 2008-12-17 15:59:43 +0000 | [diff] [blame] | 60 | return x & 0xFFFF; |
| 61 | } |
| 62 | |
reed@android.com | 41bccf5 | 2009-04-03 13:33:51 +0000 | [diff] [blame] | 63 | static inline SkFixed mirror_tileproc(SkFixed x) { |
reed@android.com | 8a1c16f | 2008-12-17 15:59:43 +0000 | [diff] [blame] | 64 | int s = x << 15 >> 31; |
| 65 | return (x ^ s) & 0xFFFF; |
| 66 | } |
| 67 | |
| 68 | static const TileProc gTileProcs[] = { |
| 69 | clamp_tileproc, |
| 70 | repeat_tileproc, |
| 71 | mirror_tileproc |
| 72 | }; |
| 73 | |
reed@google.com | 61eb040 | 2011-04-15 12:11:12 +0000 | [diff] [blame] | 74 | /////////////////////////////////////////////////////////////////////////////// |
reed@android.com | 8a1c16f | 2008-12-17 15:59:43 +0000 | [diff] [blame] | 75 | |
reed@android.com | 200645d | 2009-12-14 16:41:57 +0000 | [diff] [blame] | 76 | static inline int repeat_bits(int x, const int bits) { |
| 77 | return x & ((1 << bits) - 1); |
reed@android.com | 8a1c16f | 2008-12-17 15:59:43 +0000 | [diff] [blame] | 78 | } |
| 79 | |
reed@android.com | 200645d | 2009-12-14 16:41:57 +0000 | [diff] [blame] | 80 | static inline int mirror_bits(int x, const int bits) { |
reed@android.com | 8a1c16f | 2008-12-17 15:59:43 +0000 | [diff] [blame] | 81 | #ifdef SK_CPU_HAS_CONDITIONAL_INSTR |
reed@android.com | 200645d | 2009-12-14 16:41:57 +0000 | [diff] [blame] | 82 | if (x & (1 << bits)) |
reed@android.com | 8a1c16f | 2008-12-17 15:59:43 +0000 | [diff] [blame] | 83 | x = ~x; |
reed@android.com | 200645d | 2009-12-14 16:41:57 +0000 | [diff] [blame] | 84 | return x & ((1 << bits) - 1); |
reed@android.com | 8a1c16f | 2008-12-17 15:59:43 +0000 | [diff] [blame] | 85 | #else |
reed@android.com | 200645d | 2009-12-14 16:41:57 +0000 | [diff] [blame] | 86 | int s = x << (31 - bits) >> 31; |
| 87 | return (x ^ s) & ((1 << bits) - 1); |
reed@android.com | 8a1c16f | 2008-12-17 15:59:43 +0000 | [diff] [blame] | 88 | #endif |
| 89 | } |
| 90 | |
reed@android.com | 41bccf5 | 2009-04-03 13:33:51 +0000 | [diff] [blame] | 91 | static inline int repeat_8bits(int x) { |
reed@android.com | 8a1c16f | 2008-12-17 15:59:43 +0000 | [diff] [blame] | 92 | return x & 0xFF; |
| 93 | } |
| 94 | |
reed@android.com | 41bccf5 | 2009-04-03 13:33:51 +0000 | [diff] [blame] | 95 | static inline int mirror_8bits(int x) { |
reed@android.com | 8a1c16f | 2008-12-17 15:59:43 +0000 | [diff] [blame] | 96 | #ifdef SK_CPU_HAS_CONDITIONAL_INSTR |
reed@android.com | 41bccf5 | 2009-04-03 13:33:51 +0000 | [diff] [blame] | 97 | if (x & 256) { |
reed@android.com | 8a1c16f | 2008-12-17 15:59:43 +0000 | [diff] [blame] | 98 | x = ~x; |
reed@android.com | 41bccf5 | 2009-04-03 13:33:51 +0000 | [diff] [blame] | 99 | } |
reed@android.com | 8a1c16f | 2008-12-17 15:59:43 +0000 | [diff] [blame] | 100 | return x & 255; |
| 101 | #else |
| 102 | int s = x << 23 >> 31; |
| 103 | return (x ^ s) & 0xFF; |
| 104 | #endif |
| 105 | } |
| 106 | |
reed@google.com | 61eb040 | 2011-04-15 12:11:12 +0000 | [diff] [blame] | 107 | /////////////////////////////////////////////////////////////////////////////// |
reed@android.com | 8a1c16f | 2008-12-17 15:59:43 +0000 | [diff] [blame] | 108 | |
| 109 | class Gradient_Shader : public SkShader { |
| 110 | public: |
| 111 | Gradient_Shader(const SkColor colors[], const SkScalar pos[], |
reed@android.com | 41bccf5 | 2009-04-03 13:33:51 +0000 | [diff] [blame] | 112 | int colorCount, SkShader::TileMode mode, SkUnitMapper* mapper); |
reed@android.com | 8a1c16f | 2008-12-17 15:59:43 +0000 | [diff] [blame] | 113 | virtual ~Gradient_Shader(); |
| 114 | |
| 115 | // overrides |
| 116 | virtual bool setContext(const SkBitmap&, const SkPaint&, const SkMatrix&); |
| 117 | virtual uint32_t getFlags() { return fFlags; } |
| 118 | |
| 119 | protected: |
| 120 | Gradient_Shader(SkFlattenableReadBuffer& ); |
| 121 | SkUnitMapper* fMapper; |
| 122 | SkMatrix fPtsToUnit; // set by subclass |
| 123 | SkMatrix fDstToIndex; |
| 124 | SkMatrix::MapXYProc fDstToIndexProc; |
reed@android.com | 8a1c16f | 2008-12-17 15:59:43 +0000 | [diff] [blame] | 125 | TileMode fTileMode; |
| 126 | TileProc fTileProc; |
reed@android.com | 41bccf5 | 2009-04-03 13:33:51 +0000 | [diff] [blame] | 127 | int fColorCount; |
reed@android.com | 8a1c16f | 2008-12-17 15:59:43 +0000 | [diff] [blame] | 128 | uint8_t fDstToIndexClass; |
| 129 | uint8_t fFlags; |
| 130 | |
| 131 | struct Rec { |
| 132 | SkFixed fPos; // 0...1 |
| 133 | uint32_t fScale; // (1 << 24) / range |
| 134 | }; |
| 135 | Rec* fRecs; |
| 136 | |
| 137 | enum { |
reed@android.com | 512a876 | 2009-12-14 15:25:36 +0000 | [diff] [blame] | 138 | kCache16Bits = 8, // seems like enough for visual accuracy |
reed@android.com | 8a1c16f | 2008-12-17 15:59:43 +0000 | [diff] [blame] | 139 | kCache16Count = 1 << kCache16Bits, |
reed@android.com | 512a876 | 2009-12-14 15:25:36 +0000 | [diff] [blame] | 140 | kCache16Mask = kCache16Count - 1, |
| 141 | kCache16Shift = 16 - kCache16Bits, |
| 142 | |
reed@android.com | 8a1c16f | 2008-12-17 15:59:43 +0000 | [diff] [blame] | 143 | kCache32Bits = 8, // pretty much should always be 8 |
| 144 | kCache32Count = 1 << kCache32Bits |
| 145 | }; |
| 146 | virtual void flatten(SkFlattenableWriteBuffer& ); |
reed@google.com | 7c2f27d | 2011-03-07 19:29:00 +0000 | [diff] [blame] | 147 | const uint16_t* getCache16() const; |
| 148 | const SkPMColor* getCache32() const; |
reed@android.com | 8a1c16f | 2008-12-17 15:59:43 +0000 | [diff] [blame] | 149 | |
reed@google.com | 7c2f27d | 2011-03-07 19:29:00 +0000 | [diff] [blame] | 150 | void commonAsABitmap(SkBitmap*) const; |
vandebo@chromium.org | d3ae779 | 2011-02-24 00:21:06 +0000 | [diff] [blame] | 151 | void commonAsAGradient(GradientInfo*) const; |
reed@android.com | 9b46e77 | 2009-06-05 12:24:41 +0000 | [diff] [blame] | 152 | |
reed@android.com | 8a1c16f | 2008-12-17 15:59:43 +0000 | [diff] [blame] | 153 | private: |
| 154 | enum { |
| 155 | kColorStorageCount = 4, // more than this many colors, and we'll use sk_malloc for the space |
| 156 | |
reed@android.com | 1c12abe | 2009-07-02 15:01:02 +0000 | [diff] [blame] | 157 | kStorageSize = kColorStorageCount * (sizeof(SkColor) + sizeof(Rec)) |
reed@android.com | 8a1c16f | 2008-12-17 15:59:43 +0000 | [diff] [blame] | 158 | }; |
| 159 | SkColor fStorage[(kStorageSize + 3) >> 2]; |
| 160 | SkColor* fOrigColors; |
| 161 | |
reed@google.com | 7c2f27d | 2011-03-07 19:29:00 +0000 | [diff] [blame] | 162 | mutable uint16_t* fCache16; // working ptr. If this is NULL, we need to recompute the cache values |
| 163 | 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] | 164 | |
reed@google.com | 7c2f27d | 2011-03-07 19:29:00 +0000 | [diff] [blame] | 165 | mutable uint16_t* fCache16Storage; // storage for fCache16, allocated on demand |
| 166 | mutable SkMallocPixelRef* fCache32PixelRef; |
reed@google.com | 95eed98 | 2011-07-05 17:01:56 +0000 | [diff] [blame] | 167 | 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] | 168 | |
reed@android.com | 512a876 | 2009-12-14 15:25:36 +0000 | [diff] [blame] | 169 | static void Build16bitCache(uint16_t[], SkColor c0, SkColor c1, int count); |
reed@google.com | 55b8e8c | 2011-01-13 16:22:35 +0000 | [diff] [blame] | 170 | static void Build32bitCache(SkPMColor[], SkColor c0, SkColor c1, int count, |
| 171 | U8CPU alpha); |
reed@google.com | 95eed98 | 2011-07-05 17:01:56 +0000 | [diff] [blame] | 172 | void setCacheAlpha(U8CPU alpha) const; |
reed@android.com | 512a876 | 2009-12-14 15:25:36 +0000 | [diff] [blame] | 173 | |
reed@android.com | 8a1c16f | 2008-12-17 15:59:43 +0000 | [diff] [blame] | 174 | typedef SkShader INHERITED; |
| 175 | }; |
| 176 | |
reed@android.com | 41bccf5 | 2009-04-03 13:33:51 +0000 | [diff] [blame] | 177 | static inline unsigned scalarToU16(SkScalar x) { |
reed@android.com | 8a1c16f | 2008-12-17 15:59:43 +0000 | [diff] [blame] | 178 | SkASSERT(x >= 0 && x <= SK_Scalar1); |
| 179 | |
| 180 | #ifdef SK_SCALAR_IS_FLOAT |
| 181 | return (unsigned)(x * 0xFFFF); |
| 182 | #else |
| 183 | return x - (x >> 16); // probably should be x - (x > 0x7FFF) but that is slower |
| 184 | #endif |
| 185 | } |
| 186 | |
reed@android.com | 41bccf5 | 2009-04-03 13:33:51 +0000 | [diff] [blame] | 187 | Gradient_Shader::Gradient_Shader(const SkColor colors[], const SkScalar pos[], |
| 188 | int colorCount, SkShader::TileMode mode, SkUnitMapper* mapper) { |
reed@android.com | 8a1c16f | 2008-12-17 15:59:43 +0000 | [diff] [blame] | 189 | SkASSERT(colorCount > 1); |
| 190 | |
| 191 | fCacheAlpha = 256; // init to a value that paint.getAlpha() can't return |
| 192 | |
| 193 | fMapper = mapper; |
reed@google.com | 82065d6 | 2011-02-07 15:30:46 +0000 | [diff] [blame] | 194 | SkSafeRef(mapper); |
reed@android.com | 8a1c16f | 2008-12-17 15:59:43 +0000 | [diff] [blame] | 195 | |
reed@android.com | 8a1c16f | 2008-12-17 15:59:43 +0000 | [diff] [blame] | 196 | SkASSERT((unsigned)mode < SkShader::kTileModeCount); |
| 197 | SkASSERT(SkShader::kTileModeCount == SK_ARRAY_COUNT(gTileProcs)); |
| 198 | fTileMode = mode; |
| 199 | fTileProc = gTileProcs[mode]; |
reed@google.com | 55b8e8c | 2011-01-13 16:22:35 +0000 | [diff] [blame] | 200 | |
reed@android.com | 41bccf5 | 2009-04-03 13:33:51 +0000 | [diff] [blame] | 201 | fCache16 = fCache16Storage = NULL; |
reed@google.com | dc731fd | 2010-12-23 15:19:47 +0000 | [diff] [blame] | 202 | fCache32 = NULL; |
| 203 | fCache32PixelRef = NULL; |
reed@android.com | 8a1c16f | 2008-12-17 15:59:43 +0000 | [diff] [blame] | 204 | |
reed@android.com | 41bccf5 | 2009-04-03 13:33:51 +0000 | [diff] [blame] | 205 | /* Note: we let the caller skip the first and/or last position. |
| 206 | i.e. pos[0] = 0.3, pos[1] = 0.7 |
| 207 | In these cases, we insert dummy entries to ensure that the final data |
| 208 | will be bracketed by [0, 1]. |
| 209 | i.e. our_pos[0] = 0, our_pos[1] = 0.3, our_pos[2] = 0.7, our_pos[3] = 1 |
| 210 | |
| 211 | Thus colorCount (the caller's value, and fColorCount (our value) may |
| 212 | differ by up to 2. In the above example: |
| 213 | colorCount = 2 |
| 214 | fColorCount = 4 |
| 215 | */ |
| 216 | fColorCount = colorCount; |
| 217 | // check if we need to add in dummy start and/or end position/colors |
| 218 | bool dummyFirst = false; |
| 219 | bool dummyLast = false; |
| 220 | if (pos) { |
| 221 | dummyFirst = pos[0] != 0; |
| 222 | dummyLast = pos[colorCount - 1] != SK_Scalar1; |
| 223 | fColorCount += dummyFirst + dummyLast; |
| 224 | } |
| 225 | |
| 226 | if (fColorCount > kColorStorageCount) { |
reed@android.com | 1c12abe | 2009-07-02 15:01:02 +0000 | [diff] [blame] | 227 | size_t size = sizeof(SkColor) + sizeof(Rec); |
reed@android.com | 41bccf5 | 2009-04-03 13:33:51 +0000 | [diff] [blame] | 228 | fOrigColors = reinterpret_cast<SkColor*>( |
| 229 | sk_malloc_throw(size * fColorCount)); |
| 230 | } |
| 231 | else { |
| 232 | fOrigColors = fStorage; |
| 233 | } |
| 234 | |
| 235 | // Now copy over the colors, adding the dummies as needed |
reed@android.com | 8a1c16f | 2008-12-17 15:59:43 +0000 | [diff] [blame] | 236 | { |
reed@android.com | 41bccf5 | 2009-04-03 13:33:51 +0000 | [diff] [blame] | 237 | SkColor* origColors = fOrigColors; |
| 238 | if (dummyFirst) { |
| 239 | *origColors++ = colors[0]; |
| 240 | } |
| 241 | memcpy(origColors, colors, colorCount * sizeof(SkColor)); |
| 242 | if (dummyLast) { |
| 243 | origColors += colorCount; |
| 244 | *origColors = colors[colorCount - 1]; |
| 245 | } |
| 246 | } |
reed@android.com | 8a1c16f | 2008-12-17 15:59:43 +0000 | [diff] [blame] | 247 | |
reed@android.com | 1c12abe | 2009-07-02 15:01:02 +0000 | [diff] [blame] | 248 | fRecs = (Rec*)(fOrigColors + fColorCount); |
reed@android.com | 41bccf5 | 2009-04-03 13:33:51 +0000 | [diff] [blame] | 249 | if (fColorCount > 2) { |
| 250 | Rec* recs = fRecs; |
| 251 | recs->fPos = 0; |
| 252 | // recs->fScale = 0; // unused; |
| 253 | recs += 1; |
| 254 | if (pos) { |
reed@android.com | 8a1c16f | 2008-12-17 15:59:43 +0000 | [diff] [blame] | 255 | /* We need to convert the user's array of relative positions into |
| 256 | fixed-point positions and scale factors. We need these results |
| 257 | to be strictly monotonic (no two values equal or out of order). |
| 258 | Hence this complex loop that just jams a zero for the scale |
| 259 | value if it sees a segment out of order, and it assures that |
| 260 | we start at 0 and end at 1.0 |
| 261 | */ |
| 262 | SkFixed prev = 0; |
reed@android.com | 41bccf5 | 2009-04-03 13:33:51 +0000 | [diff] [blame] | 263 | int startIndex = dummyFirst ? 0 : 1; |
| 264 | int count = colorCount + dummyLast; |
| 265 | for (int i = startIndex; i < count; i++) { |
reed@android.com | 8a1c16f | 2008-12-17 15:59:43 +0000 | [diff] [blame] | 266 | // force the last value to be 1.0 |
| 267 | SkFixed curr; |
reed@android.com | 41bccf5 | 2009-04-03 13:33:51 +0000 | [diff] [blame] | 268 | if (i == colorCount) { // we're really at the dummyLast |
reed@android.com | 8a1c16f | 2008-12-17 15:59:43 +0000 | [diff] [blame] | 269 | curr = SK_Fixed1; |
reed@android.com | 41bccf5 | 2009-04-03 13:33:51 +0000 | [diff] [blame] | 270 | } else { |
reed@android.com | 8a1c16f | 2008-12-17 15:59:43 +0000 | [diff] [blame] | 271 | curr = SkScalarToFixed(pos[i]); |
reed@android.com | 8a1c16f | 2008-12-17 15:59:43 +0000 | [diff] [blame] | 272 | } |
reed@android.com | 41bccf5 | 2009-04-03 13:33:51 +0000 | [diff] [blame] | 273 | // pin curr withing range |
| 274 | if (curr < 0) { |
| 275 | curr = 0; |
| 276 | } else if (curr > SK_Fixed1) { |
| 277 | curr = SK_Fixed1; |
| 278 | } |
| 279 | recs->fPos = curr; |
| 280 | if (curr > prev) { |
| 281 | recs->fScale = (1 << 24) / (curr - prev); |
| 282 | } else { |
| 283 | recs->fScale = 0; // ignore this segment |
| 284 | } |
reed@android.com | 8a1c16f | 2008-12-17 15:59:43 +0000 | [diff] [blame] | 285 | // get ready for the next value |
| 286 | prev = curr; |
reed@android.com | 41bccf5 | 2009-04-03 13:33:51 +0000 | [diff] [blame] | 287 | recs += 1; |
reed@android.com | 8a1c16f | 2008-12-17 15:59:43 +0000 | [diff] [blame] | 288 | } |
reed@android.com | 41bccf5 | 2009-04-03 13:33:51 +0000 | [diff] [blame] | 289 | } else { // assume even distribution |
reed@android.com | 8a1c16f | 2008-12-17 15:59:43 +0000 | [diff] [blame] | 290 | SkFixed dp = SK_Fixed1 / (colorCount - 1); |
| 291 | SkFixed p = dp; |
| 292 | SkFixed scale = (colorCount - 1) << 8; // (1 << 24) / dp |
reed@android.com | 41bccf5 | 2009-04-03 13:33:51 +0000 | [diff] [blame] | 293 | for (int i = 1; i < colorCount; i++) { |
| 294 | recs->fPos = p; |
| 295 | recs->fScale = scale; |
| 296 | recs += 1; |
reed@android.com | 8a1c16f | 2008-12-17 15:59:43 +0000 | [diff] [blame] | 297 | p += dp; |
| 298 | } |
| 299 | } |
| 300 | } |
reed@android.com | 4a7fd2b | 2009-06-02 19:46:20 +0000 | [diff] [blame] | 301 | fFlags = 0; |
reed@android.com | 8a1c16f | 2008-12-17 15:59:43 +0000 | [diff] [blame] | 302 | } |
| 303 | |
| 304 | Gradient_Shader::Gradient_Shader(SkFlattenableReadBuffer& buffer) : |
reed@android.com | 41bccf5 | 2009-04-03 13:33:51 +0000 | [diff] [blame] | 305 | INHERITED(buffer) { |
reed@android.com | 8a1c16f | 2008-12-17 15:59:43 +0000 | [diff] [blame] | 306 | fCacheAlpha = 256; |
| 307 | |
| 308 | fMapper = static_cast<SkUnitMapper*>(buffer.readFlattenable()); |
| 309 | |
| 310 | fCache16 = fCache16Storage = NULL; |
reed@google.com | dc731fd | 2010-12-23 15:19:47 +0000 | [diff] [blame] | 311 | fCache32 = NULL; |
| 312 | fCache32PixelRef = NULL; |
reed@android.com | 8a1c16f | 2008-12-17 15:59:43 +0000 | [diff] [blame] | 313 | |
reed@android.com | 41bccf5 | 2009-04-03 13:33:51 +0000 | [diff] [blame] | 314 | int colorCount = fColorCount = buffer.readU32(); |
| 315 | if (colorCount > kColorStorageCount) { |
| 316 | size_t size = sizeof(SkColor) + sizeof(SkPMColor) + sizeof(Rec); |
| 317 | fOrigColors = (SkColor*)sk_malloc_throw(size * colorCount); |
| 318 | } else { |
reed@android.com | 8a1c16f | 2008-12-17 15:59:43 +0000 | [diff] [blame] | 319 | fOrigColors = fStorage; |
reed@android.com | 41bccf5 | 2009-04-03 13:33:51 +0000 | [diff] [blame] | 320 | } |
reed@android.com | 8a1c16f | 2008-12-17 15:59:43 +0000 | [diff] [blame] | 321 | buffer.read(fOrigColors, colorCount * sizeof(SkColor)); |
reed@android.com | 8a1c16f | 2008-12-17 15:59:43 +0000 | [diff] [blame] | 322 | |
| 323 | fTileMode = (TileMode)buffer.readU8(); |
| 324 | fTileProc = gTileProcs[fTileMode]; |
reed@android.com | 1c12abe | 2009-07-02 15:01:02 +0000 | [diff] [blame] | 325 | fRecs = (Rec*)(fOrigColors + colorCount); |
reed@android.com | 8a1c16f | 2008-12-17 15:59:43 +0000 | [diff] [blame] | 326 | if (colorCount > 2) { |
| 327 | Rec* recs = fRecs; |
| 328 | recs[0].fPos = 0; |
| 329 | for (int i = 1; i < colorCount; i++) { |
| 330 | recs[i].fPos = buffer.readS32(); |
| 331 | recs[i].fScale = buffer.readU32(); |
| 332 | } |
| 333 | } |
reed@google.com | f2eb5ab | 2011-05-10 22:56:42 +0000 | [diff] [blame] | 334 | SkReadMatrix(&buffer, &fPtsToUnit); |
reed@android.com | 4a7fd2b | 2009-06-02 19:46:20 +0000 | [diff] [blame] | 335 | fFlags = 0; |
reed@android.com | 8a1c16f | 2008-12-17 15:59:43 +0000 | [diff] [blame] | 336 | } |
| 337 | |
reed@android.com | 41bccf5 | 2009-04-03 13:33:51 +0000 | [diff] [blame] | 338 | Gradient_Shader::~Gradient_Shader() { |
| 339 | if (fCache16Storage) { |
reed@android.com | 8a1c16f | 2008-12-17 15:59:43 +0000 | [diff] [blame] | 340 | sk_free(fCache16Storage); |
reed@android.com | 41bccf5 | 2009-04-03 13:33:51 +0000 | [diff] [blame] | 341 | } |
reed@google.com | dc731fd | 2010-12-23 15:19:47 +0000 | [diff] [blame] | 342 | SkSafeUnref(fCache32PixelRef); |
reed@android.com | 41bccf5 | 2009-04-03 13:33:51 +0000 | [diff] [blame] | 343 | if (fOrigColors != fStorage) { |
reed@android.com | 8a1c16f | 2008-12-17 15:59:43 +0000 | [diff] [blame] | 344 | sk_free(fOrigColors); |
reed@android.com | 41bccf5 | 2009-04-03 13:33:51 +0000 | [diff] [blame] | 345 | } |
reed@google.com | 82065d6 | 2011-02-07 15:30:46 +0000 | [diff] [blame] | 346 | SkSafeUnref(fMapper); |
reed@android.com | 8a1c16f | 2008-12-17 15:59:43 +0000 | [diff] [blame] | 347 | } |
| 348 | |
reed@android.com | 41bccf5 | 2009-04-03 13:33:51 +0000 | [diff] [blame] | 349 | void Gradient_Shader::flatten(SkFlattenableWriteBuffer& buffer) { |
reed@android.com | 8a1c16f | 2008-12-17 15:59:43 +0000 | [diff] [blame] | 350 | this->INHERITED::flatten(buffer); |
| 351 | buffer.writeFlattenable(fMapper); |
reed@android.com | 41bccf5 | 2009-04-03 13:33:51 +0000 | [diff] [blame] | 352 | buffer.write32(fColorCount); |
reed@android.com | 8a1c16f | 2008-12-17 15:59:43 +0000 | [diff] [blame] | 353 | buffer.writeMul4(fOrigColors, fColorCount * sizeof(SkColor)); |
| 354 | buffer.write8(fTileMode); |
| 355 | if (fColorCount > 2) { |
| 356 | Rec* recs = fRecs; |
| 357 | for (int i = 1; i < fColorCount; i++) { |
| 358 | buffer.write32(recs[i].fPos); |
| 359 | buffer.write32(recs[i].fScale); |
| 360 | } |
| 361 | } |
reed@google.com | f2eb5ab | 2011-05-10 22:56:42 +0000 | [diff] [blame] | 362 | SkWriteMatrix(&buffer, fPtsToUnit); |
reed@android.com | 8a1c16f | 2008-12-17 15:59:43 +0000 | [diff] [blame] | 363 | } |
| 364 | |
| 365 | bool Gradient_Shader::setContext(const SkBitmap& device, |
| 366 | const SkPaint& paint, |
reed@android.com | 41bccf5 | 2009-04-03 13:33:51 +0000 | [diff] [blame] | 367 | const SkMatrix& matrix) { |
| 368 | if (!this->INHERITED::setContext(device, paint, matrix)) { |
reed@android.com | 8a1c16f | 2008-12-17 15:59:43 +0000 | [diff] [blame] | 369 | return false; |
reed@android.com | 41bccf5 | 2009-04-03 13:33:51 +0000 | [diff] [blame] | 370 | } |
reed@android.com | 8a1c16f | 2008-12-17 15:59:43 +0000 | [diff] [blame] | 371 | |
| 372 | const SkMatrix& inverse = this->getTotalInverse(); |
| 373 | |
| 374 | if (!fDstToIndex.setConcat(fPtsToUnit, inverse)) { |
| 375 | return false; |
| 376 | } |
| 377 | |
| 378 | fDstToIndexProc = fDstToIndex.getMapXYProc(); |
| 379 | fDstToIndexClass = (uint8_t)SkShader::ComputeMatrixClass(fDstToIndex); |
| 380 | |
| 381 | // now convert our colors in to PMColors |
| 382 | unsigned paintAlpha = this->getPaintAlpha(); |
| 383 | unsigned colorAlpha = 0xFF; |
| 384 | |
reed@android.com | 3d06a8c | 2009-07-07 18:19:59 +0000 | [diff] [blame] | 385 | // FIXME: record colorAlpha in constructor, since this is not affected |
| 386 | // by setContext() |
reed@android.com | 41bccf5 | 2009-04-03 13:33:51 +0000 | [diff] [blame] | 387 | for (int i = 0; i < fColorCount; i++) { |
reed@android.com | 8a1c16f | 2008-12-17 15:59:43 +0000 | [diff] [blame] | 388 | SkColor src = fOrigColors[i]; |
| 389 | unsigned sa = SkColorGetA(src); |
| 390 | colorAlpha &= sa; |
reed@android.com | 8a1c16f | 2008-12-17 15:59:43 +0000 | [diff] [blame] | 391 | } |
| 392 | |
| 393 | fFlags = this->INHERITED::getFlags(); |
| 394 | if ((colorAlpha & paintAlpha) == 0xFF) { |
| 395 | fFlags |= kOpaqueAlpha_Flag; |
| 396 | } |
| 397 | // we can do span16 as long as our individual colors are opaque, |
| 398 | // regardless of the paint's alpha |
| 399 | if (0xFF == colorAlpha) { |
| 400 | fFlags |= kHasSpan16_Flag; |
| 401 | } |
| 402 | |
reed@google.com | 95eed98 | 2011-07-05 17:01:56 +0000 | [diff] [blame] | 403 | this->setCacheAlpha(paintAlpha); |
| 404 | return true; |
| 405 | } |
| 406 | |
| 407 | void Gradient_Shader::setCacheAlpha(U8CPU alpha) const { |
reed@android.com | 8a1c16f | 2008-12-17 15:59:43 +0000 | [diff] [blame] | 408 | // if the new alpha differs from the previous time we were called, inval our cache |
| 409 | // this will trigger the cache to be rebuilt. |
| 410 | // 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] | 411 | if (fCacheAlpha != alpha) { |
| 412 | fCache16 = NULL; // inval the cache |
| 413 | fCache32 = NULL; // inval the cache |
| 414 | fCacheAlpha = alpha; // record the new alpha |
reed@android.com | 9b46e77 | 2009-06-05 12:24:41 +0000 | [diff] [blame] | 415 | // inform our subclasses |
reed@google.com | dc731fd | 2010-12-23 15:19:47 +0000 | [diff] [blame] | 416 | if (fCache32PixelRef) { |
| 417 | fCache32PixelRef->notifyPixelsChanged(); |
| 418 | } |
reed@android.com | 8a1c16f | 2008-12-17 15:59:43 +0000 | [diff] [blame] | 419 | } |
reed@android.com | 8a1c16f | 2008-12-17 15:59:43 +0000 | [diff] [blame] | 420 | } |
| 421 | |
reed@android.com | 41bccf5 | 2009-04-03 13:33:51 +0000 | [diff] [blame] | 422 | static inline int blend8(int a, int b, int scale) { |
reed@android.com | 8a1c16f | 2008-12-17 15:59:43 +0000 | [diff] [blame] | 423 | SkASSERT(a == SkToU8(a)); |
| 424 | SkASSERT(b == SkToU8(b)); |
| 425 | SkASSERT(scale >= 0 && scale <= 256); |
reed@android.com | 8a1c16f | 2008-12-17 15:59:43 +0000 | [diff] [blame] | 426 | return a + ((b - a) * scale >> 8); |
| 427 | } |
| 428 | |
reed@android.com | 41bccf5 | 2009-04-03 13:33:51 +0000 | [diff] [blame] | 429 | static inline uint32_t dot8_blend_packed32(uint32_t s0, uint32_t s1, |
| 430 | int blend) { |
reed@android.com | 8a1c16f | 2008-12-17 15:59:43 +0000 | [diff] [blame] | 431 | #if 0 |
| 432 | int a = blend8(SkGetPackedA32(s0), SkGetPackedA32(s1), blend); |
| 433 | int r = blend8(SkGetPackedR32(s0), SkGetPackedR32(s1), blend); |
| 434 | int g = blend8(SkGetPackedG32(s0), SkGetPackedG32(s1), blend); |
| 435 | int b = blend8(SkGetPackedB32(s0), SkGetPackedB32(s1), blend); |
| 436 | |
| 437 | return SkPackARGB32(a, r, g, b); |
| 438 | #else |
| 439 | int otherBlend = 256 - blend; |
| 440 | |
| 441 | #if 0 |
| 442 | U32 t0 = (((s0 & 0xFF00FF) * blend + (s1 & 0xFF00FF) * otherBlend) >> 8) & 0xFF00FF; |
| 443 | U32 t1 = (((s0 >> 8) & 0xFF00FF) * blend + ((s1 >> 8) & 0xFF00FF) * otherBlend) & 0xFF00FF00; |
| 444 | SkASSERT((t0 & t1) == 0); |
| 445 | return t0 | t1; |
| 446 | #else |
| 447 | return ((((s0 & 0xFF00FF) * blend + (s1 & 0xFF00FF) * otherBlend) >> 8) & 0xFF00FF) | |
| 448 | ((((s0 >> 8) & 0xFF00FF) * blend + ((s1 >> 8) & 0xFF00FF) * otherBlend) & 0xFF00FF00); |
| 449 | #endif |
| 450 | |
| 451 | #endif |
| 452 | } |
| 453 | |
| 454 | #define Fixed_To_Dot8(x) (((x) + 0x80) >> 8) |
| 455 | |
reed@android.com | 41bccf5 | 2009-04-03 13:33:51 +0000 | [diff] [blame] | 456 | /** We take the original colors, not our premultiplied PMColors, since we can |
| 457 | build a 16bit table as long as the original colors are opaque, even if the |
| 458 | paint specifies a non-opaque alpha. |
reed@android.com | 8a1c16f | 2008-12-17 15:59:43 +0000 | [diff] [blame] | 459 | */ |
reed@android.com | 512a876 | 2009-12-14 15:25:36 +0000 | [diff] [blame] | 460 | void Gradient_Shader::Build16bitCache(uint16_t cache[], SkColor c0, SkColor c1, |
| 461 | int count) { |
reed@android.com | 8a1c16f | 2008-12-17 15:59:43 +0000 | [diff] [blame] | 462 | SkASSERT(count > 1); |
| 463 | SkASSERT(SkColorGetA(c0) == 0xFF); |
| 464 | SkASSERT(SkColorGetA(c1) == 0xFF); |
| 465 | |
| 466 | SkFixed r = SkColorGetR(c0); |
| 467 | SkFixed g = SkColorGetG(c0); |
| 468 | SkFixed b = SkColorGetB(c0); |
| 469 | |
| 470 | SkFixed dr = SkIntToFixed(SkColorGetR(c1) - r) / (count - 1); |
| 471 | SkFixed dg = SkIntToFixed(SkColorGetG(c1) - g) / (count - 1); |
| 472 | SkFixed db = SkIntToFixed(SkColorGetB(c1) - b) / (count - 1); |
| 473 | |
| 474 | r = SkIntToFixed(r) + 0x8000; |
| 475 | g = SkIntToFixed(g) + 0x8000; |
| 476 | b = SkIntToFixed(b) + 0x8000; |
| 477 | |
| 478 | do { |
| 479 | unsigned rr = r >> 16; |
| 480 | unsigned gg = g >> 16; |
| 481 | unsigned bb = b >> 16; |
| 482 | cache[0] = SkPackRGB16(SkR32ToR16(rr), SkG32ToG16(gg), SkB32ToB16(bb)); |
reed@android.com | 512a876 | 2009-12-14 15:25:36 +0000 | [diff] [blame] | 483 | cache[kCache16Count] = SkDitherPack888ToRGB16(rr, gg, bb); |
reed@android.com | 8a1c16f | 2008-12-17 15:59:43 +0000 | [diff] [blame] | 484 | cache += 1; |
| 485 | r += dr; |
| 486 | g += dg; |
| 487 | b += db; |
| 488 | } while (--count != 0); |
| 489 | } |
| 490 | |
reed@google.com | 55b8e8c | 2011-01-13 16:22:35 +0000 | [diff] [blame] | 491 | /* |
| 492 | * 2x2 dither a fixed-point color component (8.16) down to 8, matching the |
| 493 | * semantics of how we 2x2 dither 32->16 |
| 494 | */ |
| 495 | static inline U8CPU dither_fixed_to_8(SkFixed n) { |
| 496 | n >>= 8; |
| 497 | return ((n << 1) - ((n >> 8 << 8) | (n >> 8))) >> 8; |
| 498 | } |
| 499 | |
| 500 | /* |
| 501 | * For dithering with premultiply, we want to ceiling the alpha component, |
| 502 | * to ensure that it is always >= any color component. |
| 503 | */ |
| 504 | static inline U8CPU dither_ceil_fixed_to_8(SkFixed n) { |
| 505 | n >>= 8; |
| 506 | return ((n << 1) - (n | (n >> 8))) >> 8; |
| 507 | } |
| 508 | |
| 509 | void Gradient_Shader::Build32bitCache(SkPMColor cache[], SkColor c0, SkColor c1, |
| 510 | int count, U8CPU paintAlpha) { |
reed@android.com | 8a1c16f | 2008-12-17 15:59:43 +0000 | [diff] [blame] | 511 | SkASSERT(count > 1); |
| 512 | |
reed@android.com | 1c12abe | 2009-07-02 15:01:02 +0000 | [diff] [blame] | 513 | // need to apply paintAlpha to our two endpoints |
| 514 | SkFixed a = SkMulDiv255Round(SkColorGetA(c0), paintAlpha); |
| 515 | SkFixed da; |
| 516 | { |
| 517 | int tmp = SkMulDiv255Round(SkColorGetA(c1), paintAlpha); |
| 518 | da = SkIntToFixed(tmp - a) / (count - 1); |
| 519 | } |
reed@android.com | 8a1c16f | 2008-12-17 15:59:43 +0000 | [diff] [blame] | 520 | |
reed@android.com | 1c12abe | 2009-07-02 15:01:02 +0000 | [diff] [blame] | 521 | SkFixed r = SkColorGetR(c0); |
| 522 | SkFixed g = SkColorGetG(c0); |
| 523 | SkFixed b = SkColorGetB(c0); |
| 524 | SkFixed dr = SkIntToFixed(SkColorGetR(c1) - r) / (count - 1); |
| 525 | SkFixed dg = SkIntToFixed(SkColorGetG(c1) - g) / (count - 1); |
| 526 | SkFixed db = SkIntToFixed(SkColorGetB(c1) - b) / (count - 1); |
reed@android.com | 8a1c16f | 2008-12-17 15:59:43 +0000 | [diff] [blame] | 527 | |
| 528 | a = SkIntToFixed(a) + 0x8000; |
| 529 | r = SkIntToFixed(r) + 0x8000; |
| 530 | g = SkIntToFixed(g) + 0x8000; |
| 531 | b = SkIntToFixed(b) + 0x8000; |
| 532 | |
| 533 | do { |
reed@google.com | 0b8b3bb | 2011-06-30 21:06:22 +0000 | [diff] [blame] | 534 | cache[0] = SkPremultiplyARGBInline(a >> 16, r >> 16, g >> 16, b >> 16); |
| 535 | cache[kCache32Count] = SkPremultiplyARGBInline(dither_ceil_fixed_to_8(a), |
| 536 | dither_fixed_to_8(r), |
| 537 | dither_fixed_to_8(g), |
| 538 | dither_fixed_to_8(b)); |
reed@google.com | 55b8e8c | 2011-01-13 16:22:35 +0000 | [diff] [blame] | 539 | cache += 1; |
reed@android.com | 8a1c16f | 2008-12-17 15:59:43 +0000 | [diff] [blame] | 540 | a += da; |
| 541 | r += dr; |
| 542 | g += dg; |
| 543 | b += db; |
| 544 | } while (--count != 0); |
| 545 | } |
| 546 | |
reed@android.com | 41bccf5 | 2009-04-03 13:33:51 +0000 | [diff] [blame] | 547 | static inline int SkFixedToFFFF(SkFixed x) { |
reed@android.com | 8a1c16f | 2008-12-17 15:59:43 +0000 | [diff] [blame] | 548 | SkASSERT((unsigned)x <= SK_Fixed1); |
| 549 | return x - (x >> 16); |
| 550 | } |
| 551 | |
reed@android.com | 200645d | 2009-12-14 16:41:57 +0000 | [diff] [blame] | 552 | static inline U16CPU bitsTo16(unsigned x, const unsigned bits) { |
reed@android.com | e191b16 | 2009-12-18 21:33:39 +0000 | [diff] [blame] | 553 | SkASSERT(x < (1U << bits)); |
reed@android.com | 200645d | 2009-12-14 16:41:57 +0000 | [diff] [blame] | 554 | if (6 == bits) { |
| 555 | return (x << 10) | (x << 4) | (x >> 2); |
| 556 | } |
| 557 | if (8 == bits) { |
| 558 | return (x << 8) | x; |
| 559 | } |
| 560 | sk_throw(); |
| 561 | return 0; |
reed@android.com | 8a1c16f | 2008-12-17 15:59:43 +0000 | [diff] [blame] | 562 | } |
| 563 | |
reed@google.com | 7c2f27d | 2011-03-07 19:29:00 +0000 | [diff] [blame] | 564 | const uint16_t* Gradient_Shader::getCache16() const { |
reed@android.com | 41bccf5 | 2009-04-03 13:33:51 +0000 | [diff] [blame] | 565 | if (fCache16 == NULL) { |
reed@google.com | 55b8e8c | 2011-01-13 16:22:35 +0000 | [diff] [blame] | 566 | // double the count for dither entries |
| 567 | const int entryCount = kCache16Count * 2; |
| 568 | const size_t allocSize = sizeof(uint16_t) * entryCount; |
| 569 | |
reed@android.com | 3c9b2a4 | 2009-08-27 19:28:37 +0000 | [diff] [blame] | 570 | if (fCache16Storage == NULL) { // set the storage and our working ptr |
reed@google.com | 55b8e8c | 2011-01-13 16:22:35 +0000 | [diff] [blame] | 571 | fCache16Storage = (uint16_t*)sk_malloc_throw(allocSize); |
reed@android.com | 3c9b2a4 | 2009-08-27 19:28:37 +0000 | [diff] [blame] | 572 | } |
reed@android.com | 8a1c16f | 2008-12-17 15:59:43 +0000 | [diff] [blame] | 573 | fCache16 = fCache16Storage; |
reed@android.com | 41bccf5 | 2009-04-03 13:33:51 +0000 | [diff] [blame] | 574 | if (fColorCount == 2) { |
reed@android.com | 512a876 | 2009-12-14 15:25:36 +0000 | [diff] [blame] | 575 | Build16bitCache(fCache16, fOrigColors[0], fOrigColors[1], kCache16Count); |
reed@android.com | 41bccf5 | 2009-04-03 13:33:51 +0000 | [diff] [blame] | 576 | } else { |
reed@android.com | 8a1c16f | 2008-12-17 15:59:43 +0000 | [diff] [blame] | 577 | Rec* rec = fRecs; |
| 578 | int prevIndex = 0; |
reed@android.com | 41bccf5 | 2009-04-03 13:33:51 +0000 | [diff] [blame] | 579 | for (int i = 1; i < fColorCount; i++) { |
reed@android.com | 512a876 | 2009-12-14 15:25:36 +0000 | [diff] [blame] | 580 | int nextIndex = SkFixedToFFFF(rec[i].fPos) >> kCache16Shift; |
reed@android.com | 8a1c16f | 2008-12-17 15:59:43 +0000 | [diff] [blame] | 581 | SkASSERT(nextIndex < kCache16Count); |
| 582 | |
| 583 | if (nextIndex > prevIndex) |
reed@android.com | 512a876 | 2009-12-14 15:25:36 +0000 | [diff] [blame] | 584 | Build16bitCache(fCache16 + prevIndex, fOrigColors[i-1], fOrigColors[i], nextIndex - prevIndex + 1); |
reed@android.com | 8a1c16f | 2008-12-17 15:59:43 +0000 | [diff] [blame] | 585 | prevIndex = nextIndex; |
| 586 | } |
| 587 | SkASSERT(prevIndex == kCache16Count - 1); |
| 588 | } |
| 589 | |
reed@android.com | 41bccf5 | 2009-04-03 13:33:51 +0000 | [diff] [blame] | 590 | if (fMapper) { |
reed@google.com | 55b8e8c | 2011-01-13 16:22:35 +0000 | [diff] [blame] | 591 | fCache16Storage = (uint16_t*)sk_malloc_throw(allocSize); |
reed@android.com | 8a1c16f | 2008-12-17 15:59:43 +0000 | [diff] [blame] | 592 | uint16_t* linear = fCache16; // just computed linear data |
| 593 | uint16_t* mapped = fCache16Storage; // storage for mapped data |
| 594 | SkUnitMapper* map = fMapper; |
reed@android.com | 200645d | 2009-12-14 16:41:57 +0000 | [diff] [blame] | 595 | for (int i = 0; i < kCache16Count; i++) { |
| 596 | int index = map->mapUnit16(bitsTo16(i, kCache16Bits)) >> kCache16Shift; |
reed@android.com | 8a1c16f | 2008-12-17 15:59:43 +0000 | [diff] [blame] | 597 | mapped[i] = linear[index]; |
reed@android.com | 200645d | 2009-12-14 16:41:57 +0000 | [diff] [blame] | 598 | mapped[i + kCache16Count] = linear[index + kCache16Count]; |
reed@android.com | 8a1c16f | 2008-12-17 15:59:43 +0000 | [diff] [blame] | 599 | } |
| 600 | sk_free(fCache16); |
| 601 | fCache16 = fCache16Storage; |
| 602 | } |
| 603 | } |
| 604 | return fCache16; |
| 605 | } |
| 606 | |
reed@google.com | 7c2f27d | 2011-03-07 19:29:00 +0000 | [diff] [blame] | 607 | const SkPMColor* Gradient_Shader::getCache32() const { |
reed@android.com | 41bccf5 | 2009-04-03 13:33:51 +0000 | [diff] [blame] | 608 | if (fCache32 == NULL) { |
reed@google.com | 55b8e8c | 2011-01-13 16:22:35 +0000 | [diff] [blame] | 609 | // double the count for dither entries |
| 610 | const int entryCount = kCache32Count * 2; |
| 611 | const size_t allocSize = sizeof(SkPMColor) * entryCount; |
| 612 | |
reed@google.com | dc731fd | 2010-12-23 15:19:47 +0000 | [diff] [blame] | 613 | if (NULL == fCache32PixelRef) { |
reed@google.com | 55b8e8c | 2011-01-13 16:22:35 +0000 | [diff] [blame] | 614 | fCache32PixelRef = SkNEW_ARGS(SkMallocPixelRef, |
| 615 | (NULL, allocSize, NULL)); |
reed@google.com | dc731fd | 2010-12-23 15:19:47 +0000 | [diff] [blame] | 616 | } |
| 617 | fCache32 = (SkPMColor*)fCache32PixelRef->getAddr(); |
reed@android.com | 41bccf5 | 2009-04-03 13:33:51 +0000 | [diff] [blame] | 618 | if (fColorCount == 2) { |
reed@google.com | 55b8e8c | 2011-01-13 16:22:35 +0000 | [diff] [blame] | 619 | Build32bitCache(fCache32, fOrigColors[0], fOrigColors[1], |
| 620 | kCache32Count, fCacheAlpha); |
reed@android.com | 41bccf5 | 2009-04-03 13:33:51 +0000 | [diff] [blame] | 621 | } else { |
reed@android.com | 8a1c16f | 2008-12-17 15:59:43 +0000 | [diff] [blame] | 622 | Rec* rec = fRecs; |
| 623 | int prevIndex = 0; |
reed@android.com | 41bccf5 | 2009-04-03 13:33:51 +0000 | [diff] [blame] | 624 | for (int i = 1; i < fColorCount; i++) { |
reed@android.com | 8a1c16f | 2008-12-17 15:59:43 +0000 | [diff] [blame] | 625 | int nextIndex = SkFixedToFFFF(rec[i].fPos) >> (16 - kCache32Bits); |
| 626 | SkASSERT(nextIndex < kCache32Count); |
| 627 | |
| 628 | if (nextIndex > prevIndex) |
reed@google.com | 55b8e8c | 2011-01-13 16:22:35 +0000 | [diff] [blame] | 629 | Build32bitCache(fCache32 + prevIndex, fOrigColors[i-1], |
| 630 | fOrigColors[i], |
| 631 | nextIndex - prevIndex + 1, fCacheAlpha); |
reed@android.com | 8a1c16f | 2008-12-17 15:59:43 +0000 | [diff] [blame] | 632 | prevIndex = nextIndex; |
| 633 | } |
| 634 | SkASSERT(prevIndex == kCache32Count - 1); |
| 635 | } |
| 636 | |
reed@android.com | 41bccf5 | 2009-04-03 13:33:51 +0000 | [diff] [blame] | 637 | if (fMapper) { |
reed@google.com | dc731fd | 2010-12-23 15:19:47 +0000 | [diff] [blame] | 638 | SkMallocPixelRef* newPR = SkNEW_ARGS(SkMallocPixelRef, |
reed@google.com | 55b8e8c | 2011-01-13 16:22:35 +0000 | [diff] [blame] | 639 | (NULL, allocSize, NULL)); |
reed@android.com | 8a1c16f | 2008-12-17 15:59:43 +0000 | [diff] [blame] | 640 | SkPMColor* linear = fCache32; // just computed linear data |
reed@google.com | dc731fd | 2010-12-23 15:19:47 +0000 | [diff] [blame] | 641 | SkPMColor* mapped = (SkPMColor*)newPR->getAddr(); // storage for mapped data |
reed@android.com | 8a1c16f | 2008-12-17 15:59:43 +0000 | [diff] [blame] | 642 | SkUnitMapper* map = fMapper; |
reed@google.com | 55b8e8c | 2011-01-13 16:22:35 +0000 | [diff] [blame] | 643 | for (int i = 0; i < kCache32Count; i++) { |
| 644 | int index = map->mapUnit16((i << 8) | i) >> 8; |
| 645 | mapped[i] = linear[index]; |
| 646 | mapped[i + kCache32Count] = linear[index + kCache32Count]; |
reed@android.com | 41bccf5 | 2009-04-03 13:33:51 +0000 | [diff] [blame] | 647 | } |
reed@google.com | dc731fd | 2010-12-23 15:19:47 +0000 | [diff] [blame] | 648 | fCache32PixelRef->unref(); |
| 649 | fCache32PixelRef = newPR; |
| 650 | fCache32 = (SkPMColor*)newPR->getAddr(); |
reed@android.com | 8a1c16f | 2008-12-17 15:59:43 +0000 | [diff] [blame] | 651 | } |
| 652 | } |
| 653 | return fCache32; |
| 654 | } |
| 655 | |
reed@google.com | dc731fd | 2010-12-23 15:19:47 +0000 | [diff] [blame] | 656 | /* |
| 657 | * Because our caller might rebuild the same (logically the same) gradient |
| 658 | * over and over, we'd like to return exactly the same "bitmap" if possible, |
| 659 | * allowing the client to utilize a cache of our bitmap (e.g. with a GPU). |
| 660 | * To do that, we maintain a private cache of built-bitmaps, based on our |
| 661 | * colors and positions. Note: we don't try to flatten the fMapper, so if one |
| 662 | * is present, we skip the cache for now. |
| 663 | */ |
reed@google.com | 7c2f27d | 2011-03-07 19:29:00 +0000 | [diff] [blame] | 664 | void Gradient_Shader::commonAsABitmap(SkBitmap* bitmap) const { |
reed@google.com | 95eed98 | 2011-07-05 17:01:56 +0000 | [diff] [blame] | 665 | // our caller assumes no external alpha, so we ensure that our cache is |
| 666 | // built with 0xFF |
| 667 | this->setCacheAlpha(0xFF); |
| 668 | |
reed@google.com | dc731fd | 2010-12-23 15:19:47 +0000 | [diff] [blame] | 669 | // don't have a way to put the mapper into our cache-key yet |
| 670 | if (fMapper) { |
| 671 | // force our cahce32pixelref to be built |
| 672 | (void)this->getCache32(); |
| 673 | bitmap->setConfig(SkBitmap::kARGB_8888_Config, kCache32Count, 1); |
| 674 | bitmap->setPixelRef(fCache32PixelRef); |
| 675 | return; |
| 676 | } |
| 677 | |
| 678 | // build our key: [numColors + colors[] + {positions[]} ] |
| 679 | int count = 1 + fColorCount; |
| 680 | if (fColorCount > 2) { |
| 681 | count += fColorCount - 1; // fRecs[].fPos |
| 682 | } |
| 683 | |
| 684 | SkAutoSTMalloc<16, int32_t> storage(count); |
| 685 | int32_t* buffer = storage.get(); |
| 686 | |
| 687 | *buffer++ = fColorCount; |
| 688 | memcpy(buffer, fOrigColors, fColorCount * sizeof(SkColor)); |
| 689 | buffer += fColorCount; |
| 690 | if (fColorCount > 2) { |
| 691 | for (int i = 1; i < fColorCount; i++) { |
| 692 | *buffer++ = fRecs[i].fPos; |
| 693 | } |
| 694 | } |
| 695 | SkASSERT(buffer - storage.get() == count); |
| 696 | |
| 697 | /////////////////////////////////// |
| 698 | |
| 699 | static SkMutex gMutex; |
| 700 | static SkBitmapCache* gCache; |
| 701 | // each cache cost 1K of RAM, since each bitmap will be 1x256 at 32bpp |
| 702 | static const int MAX_NUM_CACHED_GRADIENT_BITMAPS = 32; |
| 703 | SkAutoMutexAcquire ama(gMutex); |
reed@google.com | 55b8e8c | 2011-01-13 16:22:35 +0000 | [diff] [blame] | 704 | |
reed@google.com | dc731fd | 2010-12-23 15:19:47 +0000 | [diff] [blame] | 705 | if (NULL == gCache) { |
| 706 | gCache = new SkBitmapCache(MAX_NUM_CACHED_GRADIENT_BITMAPS); |
| 707 | } |
| 708 | size_t size = count * sizeof(int32_t); |
| 709 | |
| 710 | if (!gCache->find(storage.get(), size, bitmap)) { |
| 711 | // force our cahce32pixelref to be built |
| 712 | (void)this->getCache32(); |
| 713 | bitmap->setConfig(SkBitmap::kARGB_8888_Config, kCache32Count, 1); |
| 714 | bitmap->setPixelRef(fCache32PixelRef); |
| 715 | |
| 716 | gCache->add(storage.get(), size, *bitmap); |
| 717 | } |
| 718 | } |
| 719 | |
vandebo@chromium.org | d3ae779 | 2011-02-24 00:21:06 +0000 | [diff] [blame] | 720 | void Gradient_Shader::commonAsAGradient(GradientInfo* info) const { |
| 721 | if (info) { |
| 722 | if (info->fColorCount >= fColorCount) { |
| 723 | if (info->fColors) { |
| 724 | memcpy(info->fColors, fOrigColors, |
| 725 | fColorCount * sizeof(SkColor)); |
| 726 | } |
| 727 | if (info->fColorOffsets) { |
| 728 | if (fColorCount == 2) { |
| 729 | info->fColorOffsets[0] = 0; |
| 730 | info->fColorOffsets[1] = SK_Scalar1; |
| 731 | } else if (fColorCount > 2) { |
| 732 | for (int i = 0; i < fColorCount; i++) |
| 733 | info->fColorOffsets[i] = SkFixedToScalar(fRecs[i].fPos); |
| 734 | } |
| 735 | } |
| 736 | } |
| 737 | info->fColorCount = fColorCount; |
| 738 | info->fTileMode = fTileMode; |
| 739 | } |
| 740 | } |
| 741 | |
reed@google.com | 61eb040 | 2011-04-15 12:11:12 +0000 | [diff] [blame] | 742 | /////////////////////////////////////////////////////////////////////////////// |
reed@android.com | 8a1c16f | 2008-12-17 15:59:43 +0000 | [diff] [blame] | 743 | |
reed@android.com | 41bccf5 | 2009-04-03 13:33:51 +0000 | [diff] [blame] | 744 | 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] | 745 | SkVector vec = pts[1] - pts[0]; |
| 746 | SkScalar mag = vec.length(); |
| 747 | SkScalar inv = mag ? SkScalarInvert(mag) : 0; |
| 748 | |
| 749 | vec.scale(inv); |
| 750 | matrix->setSinCos(-vec.fY, vec.fX, pts[0].fX, pts[0].fY); |
| 751 | matrix->postTranslate(-pts[0].fX, -pts[0].fY); |
| 752 | matrix->postScale(inv, inv); |
| 753 | } |
| 754 | |
| 755 | /////////////////////////////////////////////////////////////////////////////// |
| 756 | |
| 757 | class Linear_Gradient : public Gradient_Shader { |
| 758 | public: |
| 759 | Linear_Gradient(const SkPoint pts[2], |
| 760 | const SkColor colors[], const SkScalar pos[], int colorCount, |
| 761 | SkShader::TileMode mode, SkUnitMapper* mapper) |
vandebo@chromium.org | d3ae779 | 2011-02-24 00:21:06 +0000 | [diff] [blame] | 762 | : Gradient_Shader(colors, pos, colorCount, mode, mapper), |
| 763 | fStart(pts[0]), |
| 764 | fEnd(pts[1]) |
reed@android.com | 8a1c16f | 2008-12-17 15:59:43 +0000 | [diff] [blame] | 765 | { |
| 766 | pts_to_unit_matrix(pts, &fPtsToUnit); |
| 767 | } |
reed@android.com | 9b46e77 | 2009-06-05 12:24:41 +0000 | [diff] [blame] | 768 | |
reed@android.com | 5119bdb | 2009-06-12 21:27:03 +0000 | [diff] [blame] | 769 | virtual bool setContext(const SkBitmap&, const SkPaint&, const SkMatrix&); |
reed@android.com | 8a1c16f | 2008-12-17 15:59:43 +0000 | [diff] [blame] | 770 | virtual void shadeSpan(int x, int y, SkPMColor dstC[], int count); |
| 771 | 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] | 772 | virtual BitmapType asABitmap(SkBitmap*, SkMatrix*, |
reed@google.com | 7c2f27d | 2011-03-07 19:29:00 +0000 | [diff] [blame] | 773 | TileMode*, SkScalar* twoPointRadialParams) const; |
vandebo@chromium.org | d3ae779 | 2011-02-24 00:21:06 +0000 | [diff] [blame] | 774 | virtual GradientType asAGradient(GradientInfo* info) const; |
reed@android.com | 8a1c16f | 2008-12-17 15:59:43 +0000 | [diff] [blame] | 775 | |
reed@google.com | 55b8e8c | 2011-01-13 16:22:35 +0000 | [diff] [blame] | 776 | static SkFlattenable* CreateProc(SkFlattenableReadBuffer& buffer) { |
reed@android.com | 8a1c16f | 2008-12-17 15:59:43 +0000 | [diff] [blame] | 777 | return SkNEW_ARGS(Linear_Gradient, (buffer)); |
| 778 | } |
| 779 | |
vandebo@chromium.org | d3ae779 | 2011-02-24 00:21:06 +0000 | [diff] [blame] | 780 | virtual void flatten(SkFlattenableWriteBuffer& buffer) { |
| 781 | this->INHERITED::flatten(buffer); |
| 782 | buffer.writeScalar(fStart.fX); |
| 783 | buffer.writeScalar(fStart.fY); |
| 784 | buffer.writeScalar(fEnd.fX); |
| 785 | buffer.writeScalar(fEnd.fY); |
| 786 | } |
| 787 | |
reed@android.com | 8a1c16f | 2008-12-17 15:59:43 +0000 | [diff] [blame] | 788 | protected: |
vandebo@chromium.org | d3ae779 | 2011-02-24 00:21:06 +0000 | [diff] [blame] | 789 | Linear_Gradient(SkFlattenableReadBuffer& buffer) |
| 790 | : Gradient_Shader(buffer), |
tomhudson@google.com | 9ce767c | 2011-04-25 20:49:39 +0000 | [diff] [blame] | 791 | fStart(unflatten_point(buffer)), |
| 792 | fEnd(unflatten_point(buffer)) { |
vandebo@chromium.org | d3ae779 | 2011-02-24 00:21:06 +0000 | [diff] [blame] | 793 | } |
reed@android.com | 8a1c16f | 2008-12-17 15:59:43 +0000 | [diff] [blame] | 794 | virtual Factory getFactory() { return CreateProc; } |
| 795 | |
| 796 | private: |
| 797 | typedef Gradient_Shader INHERITED; |
vandebo@chromium.org | d3ae779 | 2011-02-24 00:21:06 +0000 | [diff] [blame] | 798 | const SkPoint fStart; |
| 799 | const SkPoint fEnd; |
reed@android.com | 8a1c16f | 2008-12-17 15:59:43 +0000 | [diff] [blame] | 800 | }; |
| 801 | |
reed@android.com | 5119bdb | 2009-06-12 21:27:03 +0000 | [diff] [blame] | 802 | bool Linear_Gradient::setContext(const SkBitmap& device, const SkPaint& paint, |
| 803 | const SkMatrix& matrix) { |
| 804 | if (!this->INHERITED::setContext(device, paint, matrix)) { |
| 805 | return false; |
| 806 | } |
| 807 | |
| 808 | unsigned mask = SkMatrix::kTranslate_Mask | SkMatrix::kScale_Mask; |
| 809 | if ((fDstToIndex.getType() & ~mask) == 0) { |
reed@android.com | 3c9b2a4 | 2009-08-27 19:28:37 +0000 | [diff] [blame] | 810 | fFlags |= SkShader::kConstInY32_Flag; |
| 811 | if ((fFlags & SkShader::kHasSpan16_Flag) && !paint.isDither()) { |
| 812 | // only claim this if we do have a 16bit mode (i.e. none of our |
| 813 | // colors have alpha), and if we are not dithering (which obviously |
| 814 | // is not const in Y). |
| 815 | fFlags |= SkShader::kConstInY16_Flag; |
| 816 | } |
reed@android.com | 5119bdb | 2009-06-12 21:27:03 +0000 | [diff] [blame] | 817 | } |
| 818 | return true; |
| 819 | } |
| 820 | |
reed@android.com | 8a1c16f | 2008-12-17 15:59:43 +0000 | [diff] [blame] | 821 | // 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] | 822 | 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] | 823 | SkASSERT(count > 0); |
| 824 | return (unsigned)((fx | (fx + (count - 1) * dx)) >> 8) <= 0xFF; |
| 825 | } |
| 826 | |
reed@google.com | 5eb158d | 2011-04-15 15:50:34 +0000 | [diff] [blame] | 827 | #include "SkClampRange.h" |
| 828 | |
| 829 | #define NO_CHECK_ITER \ |
reed@google.com | 13659f1 | 2011-04-18 19:59:38 +0000 | [diff] [blame] | 830 | do { \ |
| 831 | unsigned fi = fx >> 8; \ |
reed@google.com | 5eb158d | 2011-04-15 15:50:34 +0000 | [diff] [blame] | 832 | SkASSERT(fi <= 0xFF); \ |
| 833 | fx += dx; \ |
| 834 | *dstC++ = cache[toggle + fi]; \ |
reed@google.com | 13659f1 | 2011-04-18 19:59:38 +0000 | [diff] [blame] | 835 | toggle ^= TOGGLE_MASK; \ |
| 836 | } while (0) |
reed@google.com | 5eb158d | 2011-04-15 15:50:34 +0000 | [diff] [blame] | 837 | |
| 838 | |
reed@google.com | dd5bd67 | 2011-09-20 15:56:13 +0000 | [diff] [blame^] | 839 | void Linear_Gradient::shadeSpan(int x, int y, SkPMColor* SK_RESTRICT dstC, int count) { |
reed@android.com | 8a1c16f | 2008-12-17 15:59:43 +0000 | [diff] [blame] | 840 | SkASSERT(count > 0); |
| 841 | |
| 842 | SkPoint srcPt; |
| 843 | SkMatrix::MapXYProc dstProc = fDstToIndexProc; |
| 844 | TileProc proc = fTileProc; |
reed@google.com | dd5bd67 | 2011-09-20 15:56:13 +0000 | [diff] [blame^] | 845 | const SkPMColor* SK_RESTRICT cache = this->getCache32(); |
reed@google.com | 55b8e8c | 2011-01-13 16:22:35 +0000 | [diff] [blame] | 846 | #ifdef USE_DITHER_32BIT_GRADIENT |
| 847 | int toggle = ((x ^ y) & 1) << kCache32Bits; |
| 848 | const int TOGGLE_MASK = (1 << kCache32Bits); |
| 849 | #else |
| 850 | int toggle = 0; |
| 851 | const int TOGGLE_MASK = 0; |
| 852 | #endif |
reed@android.com | 8a1c16f | 2008-12-17 15:59:43 +0000 | [diff] [blame] | 853 | |
reed@android.com | c552a43 | 2009-06-12 20:02:50 +0000 | [diff] [blame] | 854 | if (fDstToIndexClass != kPerspective_MatrixClass) { |
reed@google.com | dc731fd | 2010-12-23 15:19:47 +0000 | [diff] [blame] | 855 | dstProc(fDstToIndex, SkIntToScalar(x) + SK_ScalarHalf, |
| 856 | SkIntToScalar(y) + SK_ScalarHalf, &srcPt); |
reed@android.com | 8a1c16f | 2008-12-17 15:59:43 +0000 | [diff] [blame] | 857 | SkFixed dx, fx = SkScalarToFixed(srcPt.fX); |
| 858 | |
reed@android.com | c552a43 | 2009-06-12 20:02:50 +0000 | [diff] [blame] | 859 | if (fDstToIndexClass == kFixedStepInX_MatrixClass) { |
reed@android.com | 8a1c16f | 2008-12-17 15:59:43 +0000 | [diff] [blame] | 860 | SkFixed dxStorage[1]; |
| 861 | (void)fDstToIndex.fixedStepInX(SkIntToScalar(y), dxStorage, NULL); |
| 862 | dx = dxStorage[0]; |
reed@android.com | c552a43 | 2009-06-12 20:02:50 +0000 | [diff] [blame] | 863 | } else { |
reed@android.com | 8a1c16f | 2008-12-17 15:59:43 +0000 | [diff] [blame] | 864 | SkASSERT(fDstToIndexClass == kLinear_MatrixClass); |
| 865 | dx = SkScalarToFixed(fDstToIndex.getScaleX()); |
| 866 | } |
| 867 | |
reed@android.com | c552a43 | 2009-06-12 20:02:50 +0000 | [diff] [blame] | 868 | if (SkFixedNearlyZero(dx)) { |
| 869 | // we're a vertical gradient, so no change in a span |
reed@android.com | 8a1c16f | 2008-12-17 15:59:43 +0000 | [diff] [blame] | 870 | unsigned fi = proc(fx); |
| 871 | SkASSERT(fi <= 0xFFFF); |
reed@google.com | 55b8e8c | 2011-01-13 16:22:35 +0000 | [diff] [blame] | 872 | // TODO: dither version |
reed@android.com | 8a1c16f | 2008-12-17 15:59:43 +0000 | [diff] [blame] | 873 | sk_memset32(dstC, cache[fi >> (16 - kCache32Bits)], count); |
reed@android.com | c552a43 | 2009-06-12 20:02:50 +0000 | [diff] [blame] | 874 | } else if (proc == clamp_tileproc) { |
reed@google.com | 5eb158d | 2011-04-15 15:50:34 +0000 | [diff] [blame] | 875 | SkClampRange range; |
| 876 | range.init(fx, dx, count, 0, 0xFF); |
| 877 | |
| 878 | if ((count = range.fCount0) > 0) { |
| 879 | sk_memset32_dither(dstC, |
| 880 | cache[toggle + range.fV0], |
| 881 | cache[(toggle ^ TOGGLE_MASK) + range.fV0], |
| 882 | count); |
| 883 | dstC += count; |
| 884 | } |
| 885 | if ((count = range.fCount1) > 0) { |
reed@google.com | 13659f1 | 2011-04-18 19:59:38 +0000 | [diff] [blame] | 886 | int unroll = count >> 3; |
| 887 | fx = range.fFx1; |
| 888 | for (int i = 0; i < unroll; i++) { |
reed@google.com | 5eb158d | 2011-04-15 15:50:34 +0000 | [diff] [blame] | 889 | NO_CHECK_ITER; NO_CHECK_ITER; |
| 890 | NO_CHECK_ITER; NO_CHECK_ITER; |
| 891 | NO_CHECK_ITER; NO_CHECK_ITER; |
| 892 | NO_CHECK_ITER; NO_CHECK_ITER; |
| 893 | } |
| 894 | if ((count &= 7) > 0) { |
| 895 | do { |
| 896 | NO_CHECK_ITER; |
| 897 | } while (--count != 0); |
| 898 | } |
| 899 | } |
| 900 | if ((count = range.fCount2) > 0) { |
| 901 | sk_memset32_dither(dstC, |
| 902 | cache[toggle + range.fV1], |
| 903 | cache[(toggle ^ TOGGLE_MASK) + range.fV1], |
| 904 | count); |
| 905 | } |
reed@android.com | c552a43 | 2009-06-12 20:02:50 +0000 | [diff] [blame] | 906 | } else if (proc == mirror_tileproc) { |
reed@android.com | 8a1c16f | 2008-12-17 15:59:43 +0000 | [diff] [blame] | 907 | do { |
| 908 | unsigned fi = mirror_8bits(fx >> 8); |
| 909 | SkASSERT(fi <= 0xFF); |
| 910 | fx += dx; |
reed@google.com | 55b8e8c | 2011-01-13 16:22:35 +0000 | [diff] [blame] | 911 | *dstC++ = cache[toggle + fi]; |
| 912 | toggle ^= TOGGLE_MASK; |
reed@android.com | 8a1c16f | 2008-12-17 15:59:43 +0000 | [diff] [blame] | 913 | } while (--count != 0); |
reed@android.com | c552a43 | 2009-06-12 20:02:50 +0000 | [diff] [blame] | 914 | } else { |
reed@android.com | 8a1c16f | 2008-12-17 15:59:43 +0000 | [diff] [blame] | 915 | SkASSERT(proc == repeat_tileproc); |
| 916 | do { |
| 917 | unsigned fi = repeat_8bits(fx >> 8); |
| 918 | SkASSERT(fi <= 0xFF); |
| 919 | fx += dx; |
reed@google.com | 55b8e8c | 2011-01-13 16:22:35 +0000 | [diff] [blame] | 920 | *dstC++ = cache[toggle + fi]; |
| 921 | toggle ^= TOGGLE_MASK; |
reed@android.com | 8a1c16f | 2008-12-17 15:59:43 +0000 | [diff] [blame] | 922 | } while (--count != 0); |
| 923 | } |
reed@android.com | c552a43 | 2009-06-12 20:02:50 +0000 | [diff] [blame] | 924 | } else { |
reed@android.com | 8a1c16f | 2008-12-17 15:59:43 +0000 | [diff] [blame] | 925 | SkScalar dstX = SkIntToScalar(x); |
| 926 | SkScalar dstY = SkIntToScalar(y); |
| 927 | do { |
| 928 | dstProc(fDstToIndex, dstX, dstY, &srcPt); |
| 929 | unsigned fi = proc(SkScalarToFixed(srcPt.fX)); |
| 930 | SkASSERT(fi <= 0xFFFF); |
reed@google.com | 55b8e8c | 2011-01-13 16:22:35 +0000 | [diff] [blame] | 931 | *dstC++ = cache[toggle + (fi >> (16 - kCache32Bits))]; |
| 932 | toggle ^= TOGGLE_MASK; |
reed@android.com | 8a1c16f | 2008-12-17 15:59:43 +0000 | [diff] [blame] | 933 | dstX += SK_Scalar1; |
| 934 | } while (--count != 0); |
| 935 | } |
| 936 | } |
| 937 | |
reed@google.com | 55b8e8c | 2011-01-13 16:22:35 +0000 | [diff] [blame] | 938 | SkShader::BitmapType Linear_Gradient::asABitmap(SkBitmap* bitmap, |
reed@google.com | dc731fd | 2010-12-23 15:19:47 +0000 | [diff] [blame] | 939 | SkMatrix* matrix, |
| 940 | TileMode xy[], |
reed@google.com | 7c2f27d | 2011-03-07 19:29:00 +0000 | [diff] [blame] | 941 | SkScalar* twoPointRadialParams) const { |
reed@android.com | 8a1c16f | 2008-12-17 15:59:43 +0000 | [diff] [blame] | 942 | if (bitmap) { |
reed@google.com | dc731fd | 2010-12-23 15:19:47 +0000 | [diff] [blame] | 943 | this->commonAsABitmap(bitmap); |
reed@android.com | 8a1c16f | 2008-12-17 15:59:43 +0000 | [diff] [blame] | 944 | } |
| 945 | if (matrix) { |
| 946 | matrix->setScale(SkIntToScalar(kCache32Count), SK_Scalar1); |
| 947 | matrix->preConcat(fPtsToUnit); |
| 948 | } |
| 949 | if (xy) { |
| 950 | xy[0] = fTileMode; |
| 951 | xy[1] = kClamp_TileMode; |
| 952 | } |
reed@google.com | dc731fd | 2010-12-23 15:19:47 +0000 | [diff] [blame] | 953 | return kDefault_BitmapType; |
reed@android.com | 8a1c16f | 2008-12-17 15:59:43 +0000 | [diff] [blame] | 954 | } |
| 955 | |
vandebo@chromium.org | d3ae779 | 2011-02-24 00:21:06 +0000 | [diff] [blame] | 956 | SkShader::GradientType Linear_Gradient::asAGradient(GradientInfo* info) const { |
| 957 | if (info) { |
| 958 | commonAsAGradient(info); |
| 959 | info->fPoint[0] = fStart; |
| 960 | info->fPoint[1] = fEnd; |
| 961 | } |
| 962 | return kLinear_GradientType; |
| 963 | } |
| 964 | |
reed@android.com | 3c9b2a4 | 2009-08-27 19:28:37 +0000 | [diff] [blame] | 965 | static void dither_memset16(uint16_t dst[], uint16_t value, uint16_t other, |
| 966 | int count) { |
| 967 | if (reinterpret_cast<uintptr_t>(dst) & 2) { |
reed@android.com | 8a1c16f | 2008-12-17 15:59:43 +0000 | [diff] [blame] | 968 | *dst++ = value; |
| 969 | count -= 1; |
| 970 | SkTSwap(value, other); |
| 971 | } |
| 972 | |
| 973 | sk_memset32((uint32_t*)dst, (value << 16) | other, count >> 1); |
reed@google.com | 55b8e8c | 2011-01-13 16:22:35 +0000 | [diff] [blame] | 974 | |
reed@android.com | 3c9b2a4 | 2009-08-27 19:28:37 +0000 | [diff] [blame] | 975 | if (count & 1) { |
reed@android.com | 8a1c16f | 2008-12-17 15:59:43 +0000 | [diff] [blame] | 976 | dst[count - 1] = value; |
reed@android.com | 3c9b2a4 | 2009-08-27 19:28:37 +0000 | [diff] [blame] | 977 | } |
reed@android.com | 8a1c16f | 2008-12-17 15:59:43 +0000 | [diff] [blame] | 978 | } |
reed@android.com | 8a1c16f | 2008-12-17 15:59:43 +0000 | [diff] [blame] | 979 | |
reed@google.com | 5eb158d | 2011-04-15 15:50:34 +0000 | [diff] [blame] | 980 | #define NO_CHECK_ITER_16 \ |
reed@google.com | 13659f1 | 2011-04-18 19:59:38 +0000 | [diff] [blame] | 981 | do { \ |
| 982 | unsigned fi = fx >> kCache16Shift; \ |
reed@google.com | 5eb158d | 2011-04-15 15:50:34 +0000 | [diff] [blame] | 983 | SkASSERT(fi <= kCache16Mask); \ |
| 984 | fx += dx; \ |
| 985 | *dstC++ = cache[toggle + fi]; \ |
reed@google.com | 13659f1 | 2011-04-18 19:59:38 +0000 | [diff] [blame] | 986 | toggle ^= TOGGLE_MASK; \ |
| 987 | } while (0) |
reed@google.com | 5eb158d | 2011-04-15 15:50:34 +0000 | [diff] [blame] | 988 | |
| 989 | |
reed@google.com | dd5bd67 | 2011-09-20 15:56:13 +0000 | [diff] [blame^] | 990 | void Linear_Gradient::shadeSpan16(int x, int y, uint16_t* SK_RESTRICT dstC, int count) { |
reed@android.com | 8a1c16f | 2008-12-17 15:59:43 +0000 | [diff] [blame] | 991 | SkASSERT(count > 0); |
| 992 | |
| 993 | SkPoint srcPt; |
| 994 | SkMatrix::MapXYProc dstProc = fDstToIndexProc; |
| 995 | TileProc proc = fTileProc; |
reed@google.com | dd5bd67 | 2011-09-20 15:56:13 +0000 | [diff] [blame^] | 996 | const uint16_t* SK_RESTRICT cache = this->getCache16(); |
reed@android.com | 8a1c16f | 2008-12-17 15:59:43 +0000 | [diff] [blame] | 997 | int toggle = ((x ^ y) & 1) << kCache16Bits; |
reed@google.com | 5eb158d | 2011-04-15 15:50:34 +0000 | [diff] [blame] | 998 | const int TOGGLE_MASK = (1 << kCache32Bits); |
reed@android.com | 8a1c16f | 2008-12-17 15:59:43 +0000 | [diff] [blame] | 999 | |
reed@android.com | b2c5f2d | 2009-06-12 20:09:24 +0000 | [diff] [blame] | 1000 | if (fDstToIndexClass != kPerspective_MatrixClass) { |
reed@google.com | dc731fd | 2010-12-23 15:19:47 +0000 | [diff] [blame] | 1001 | dstProc(fDstToIndex, SkIntToScalar(x) + SK_ScalarHalf, |
| 1002 | SkIntToScalar(y) + SK_ScalarHalf, &srcPt); |
reed@android.com | 8a1c16f | 2008-12-17 15:59:43 +0000 | [diff] [blame] | 1003 | SkFixed dx, fx = SkScalarToFixed(srcPt.fX); |
| 1004 | |
reed@android.com | b2c5f2d | 2009-06-12 20:09:24 +0000 | [diff] [blame] | 1005 | if (fDstToIndexClass == kFixedStepInX_MatrixClass) { |
reed@android.com | 8a1c16f | 2008-12-17 15:59:43 +0000 | [diff] [blame] | 1006 | SkFixed dxStorage[1]; |
| 1007 | (void)fDstToIndex.fixedStepInX(SkIntToScalar(y), dxStorage, NULL); |
| 1008 | dx = dxStorage[0]; |
reed@android.com | b2c5f2d | 2009-06-12 20:09:24 +0000 | [diff] [blame] | 1009 | } else { |
reed@android.com | 8a1c16f | 2008-12-17 15:59:43 +0000 | [diff] [blame] | 1010 | SkASSERT(fDstToIndexClass == kLinear_MatrixClass); |
| 1011 | dx = SkScalarToFixed(fDstToIndex.getScaleX()); |
| 1012 | } |
| 1013 | |
reed@android.com | b2c5f2d | 2009-06-12 20:09:24 +0000 | [diff] [blame] | 1014 | if (SkFixedNearlyZero(dx)) { |
| 1015 | // we're a vertical gradient, so no change in a span |
reed@android.com | 512a876 | 2009-12-14 15:25:36 +0000 | [diff] [blame] | 1016 | unsigned fi = proc(fx) >> kCache16Shift; |
| 1017 | SkASSERT(fi <= kCache16Mask); |
reed@google.com | 5eb158d | 2011-04-15 15:50:34 +0000 | [diff] [blame] | 1018 | dither_memset16(dstC, cache[toggle + fi], |
| 1019 | cache[(toggle ^ TOGGLE_MASK) + fi], count); |
reed@android.com | b2c5f2d | 2009-06-12 20:09:24 +0000 | [diff] [blame] | 1020 | } else if (proc == clamp_tileproc) { |
reed@google.com | 5eb158d | 2011-04-15 15:50:34 +0000 | [diff] [blame] | 1021 | SkClampRange range; |
| 1022 | range.init(fx, dx, count, 0, kCache16Mask); |
| 1023 | |
| 1024 | if ((count = range.fCount0) > 0) { |
| 1025 | dither_memset16(dstC, |
| 1026 | cache[toggle + range.fV0], |
| 1027 | cache[(toggle ^ TOGGLE_MASK) + range.fV0], |
| 1028 | count); |
| 1029 | dstC += count; |
| 1030 | } |
| 1031 | if ((count = range.fCount1) > 0) { |
reed@google.com | 13659f1 | 2011-04-18 19:59:38 +0000 | [diff] [blame] | 1032 | int unroll = count >> 3; |
| 1033 | fx = range.fFx1; |
| 1034 | for (int i = 0; i < unroll; i++) { |
reed@google.com | 5eb158d | 2011-04-15 15:50:34 +0000 | [diff] [blame] | 1035 | NO_CHECK_ITER_16; NO_CHECK_ITER_16; |
| 1036 | NO_CHECK_ITER_16; NO_CHECK_ITER_16; |
| 1037 | NO_CHECK_ITER_16; NO_CHECK_ITER_16; |
| 1038 | NO_CHECK_ITER_16; NO_CHECK_ITER_16; |
| 1039 | } |
| 1040 | if ((count &= 7) > 0) { |
| 1041 | do { |
| 1042 | NO_CHECK_ITER_16; |
| 1043 | } while (--count != 0); |
| 1044 | } |
| 1045 | } |
| 1046 | if ((count = range.fCount2) > 0) { |
| 1047 | dither_memset16(dstC, |
| 1048 | cache[toggle + range.fV1], |
| 1049 | cache[(toggle ^ TOGGLE_MASK) + range.fV1], |
| 1050 | count); |
| 1051 | } |
reed@android.com | b2c5f2d | 2009-06-12 20:09:24 +0000 | [diff] [blame] | 1052 | } else if (proc == mirror_tileproc) { |
reed@android.com | 8a1c16f | 2008-12-17 15:59:43 +0000 | [diff] [blame] | 1053 | do { |
reed@android.com | 200645d | 2009-12-14 16:41:57 +0000 | [diff] [blame] | 1054 | unsigned fi = mirror_bits(fx >> kCache16Shift, kCache16Bits); |
reed@android.com | 512a876 | 2009-12-14 15:25:36 +0000 | [diff] [blame] | 1055 | SkASSERT(fi <= kCache16Mask); |
reed@android.com | 8a1c16f | 2008-12-17 15:59:43 +0000 | [diff] [blame] | 1056 | fx += dx; |
reed@android.com | 8a1c16f | 2008-12-17 15:59:43 +0000 | [diff] [blame] | 1057 | *dstC++ = cache[toggle + fi]; |
reed@google.com | 5eb158d | 2011-04-15 15:50:34 +0000 | [diff] [blame] | 1058 | toggle ^= TOGGLE_MASK; |
reed@android.com | 8a1c16f | 2008-12-17 15:59:43 +0000 | [diff] [blame] | 1059 | } while (--count != 0); |
reed@android.com | b2c5f2d | 2009-06-12 20:09:24 +0000 | [diff] [blame] | 1060 | } else { |
reed@android.com | 8a1c16f | 2008-12-17 15:59:43 +0000 | [diff] [blame] | 1061 | SkASSERT(proc == repeat_tileproc); |
| 1062 | do { |
reed@android.com | 200645d | 2009-12-14 16:41:57 +0000 | [diff] [blame] | 1063 | unsigned fi = repeat_bits(fx >> kCache16Shift, kCache16Bits); |
reed@android.com | 512a876 | 2009-12-14 15:25:36 +0000 | [diff] [blame] | 1064 | SkASSERT(fi <= kCache16Mask); |
reed@android.com | 8a1c16f | 2008-12-17 15:59:43 +0000 | [diff] [blame] | 1065 | fx += dx; |
reed@android.com | 8a1c16f | 2008-12-17 15:59:43 +0000 | [diff] [blame] | 1066 | *dstC++ = cache[toggle + fi]; |
reed@google.com | 5eb158d | 2011-04-15 15:50:34 +0000 | [diff] [blame] | 1067 | toggle ^= TOGGLE_MASK; |
reed@android.com | 8a1c16f | 2008-12-17 15:59:43 +0000 | [diff] [blame] | 1068 | } while (--count != 0); |
| 1069 | } |
reed@android.com | b2c5f2d | 2009-06-12 20:09:24 +0000 | [diff] [blame] | 1070 | } else { |
reed@android.com | 8a1c16f | 2008-12-17 15:59:43 +0000 | [diff] [blame] | 1071 | SkScalar dstX = SkIntToScalar(x); |
| 1072 | SkScalar dstY = SkIntToScalar(y); |
| 1073 | do { |
| 1074 | dstProc(fDstToIndex, dstX, dstY, &srcPt); |
| 1075 | unsigned fi = proc(SkScalarToFixed(srcPt.fX)); |
| 1076 | SkASSERT(fi <= 0xFFFF); |
| 1077 | |
reed@android.com | 512a876 | 2009-12-14 15:25:36 +0000 | [diff] [blame] | 1078 | int index = fi >> kCache16Shift; |
reed@android.com | 8a1c16f | 2008-12-17 15:59:43 +0000 | [diff] [blame] | 1079 | *dstC++ = cache[toggle + index]; |
reed@google.com | 5eb158d | 2011-04-15 15:50:34 +0000 | [diff] [blame] | 1080 | toggle ^= TOGGLE_MASK; |
reed@android.com | 8a1c16f | 2008-12-17 15:59:43 +0000 | [diff] [blame] | 1081 | |
| 1082 | dstX += SK_Scalar1; |
| 1083 | } while (--count != 0); |
| 1084 | } |
| 1085 | } |
| 1086 | |
| 1087 | /////////////////////////////////////////////////////////////////////////////// |
| 1088 | |
| 1089 | #define kSQRT_TABLE_BITS 11 |
| 1090 | #define kSQRT_TABLE_SIZE (1 << kSQRT_TABLE_BITS) |
| 1091 | |
| 1092 | #include "SkRadialGradient_Table.h" |
| 1093 | |
| 1094 | #if defined(SK_BUILD_FOR_WIN32) && defined(SK_DEBUG) |
| 1095 | |
| 1096 | #include <stdio.h> |
| 1097 | |
reed@google.com | 61eb040 | 2011-04-15 12:11:12 +0000 | [diff] [blame] | 1098 | void SkRadialGradient_BuildTable() { |
reed@android.com | 8a1c16f | 2008-12-17 15:59:43 +0000 | [diff] [blame] | 1099 | // build it 0..127 x 0..127, so we use 2^15 - 1 in the numerator for our "fixed" table |
| 1100 | |
| 1101 | FILE* file = ::fopen("SkRadialGradient_Table.h", "w"); |
| 1102 | SkASSERT(file); |
| 1103 | ::fprintf(file, "static const uint8_t gSqrt8Table[] = {\n"); |
| 1104 | |
reed@google.com | 61eb040 | 2011-04-15 12:11:12 +0000 | [diff] [blame] | 1105 | for (int i = 0; i < kSQRT_TABLE_SIZE; i++) { |
| 1106 | if ((i & 15) == 0) { |
reed@android.com | 8a1c16f | 2008-12-17 15:59:43 +0000 | [diff] [blame] | 1107 | ::fprintf(file, "\t"); |
reed@google.com | 61eb040 | 2011-04-15 12:11:12 +0000 | [diff] [blame] | 1108 | } |
reed@android.com | 8a1c16f | 2008-12-17 15:59:43 +0000 | [diff] [blame] | 1109 | |
| 1110 | uint8_t value = SkToU8(SkFixedSqrt(i * SK_Fixed1 / kSQRT_TABLE_SIZE) >> 8); |
| 1111 | |
| 1112 | ::fprintf(file, "0x%02X", value); |
reed@google.com | 61eb040 | 2011-04-15 12:11:12 +0000 | [diff] [blame] | 1113 | if (i < kSQRT_TABLE_SIZE-1) { |
reed@android.com | 8a1c16f | 2008-12-17 15:59:43 +0000 | [diff] [blame] | 1114 | ::fprintf(file, ", "); |
reed@google.com | 61eb040 | 2011-04-15 12:11:12 +0000 | [diff] [blame] | 1115 | } |
| 1116 | if ((i & 15) == 15) { |
reed@android.com | 8a1c16f | 2008-12-17 15:59:43 +0000 | [diff] [blame] | 1117 | ::fprintf(file, "\n"); |
reed@google.com | 61eb040 | 2011-04-15 12:11:12 +0000 | [diff] [blame] | 1118 | } |
reed@android.com | 8a1c16f | 2008-12-17 15:59:43 +0000 | [diff] [blame] | 1119 | } |
| 1120 | ::fprintf(file, "};\n"); |
| 1121 | ::fclose(file); |
| 1122 | } |
| 1123 | |
| 1124 | #endif |
| 1125 | |
| 1126 | |
reed@google.com | 61eb040 | 2011-04-15 12:11:12 +0000 | [diff] [blame] | 1127 | static void rad_to_unit_matrix(const SkPoint& center, SkScalar radius, |
| 1128 | SkMatrix* matrix) { |
reed@android.com | 8a1c16f | 2008-12-17 15:59:43 +0000 | [diff] [blame] | 1129 | SkScalar inv = SkScalarInvert(radius); |
| 1130 | |
| 1131 | matrix->setTranslate(-center.fX, -center.fY); |
| 1132 | matrix->postScale(inv, inv); |
| 1133 | } |
| 1134 | |
| 1135 | class Radial_Gradient : public Gradient_Shader { |
| 1136 | public: |
| 1137 | Radial_Gradient(const SkPoint& center, SkScalar radius, |
| 1138 | const SkColor colors[], const SkScalar pos[], int colorCount, |
| 1139 | SkShader::TileMode mode, SkUnitMapper* mapper) |
vandebo@chromium.org | d3ae779 | 2011-02-24 00:21:06 +0000 | [diff] [blame] | 1140 | : Gradient_Shader(colors, pos, colorCount, mode, mapper), |
| 1141 | fCenter(center), |
| 1142 | fRadius(radius) |
reed@android.com | 8a1c16f | 2008-12-17 15:59:43 +0000 | [diff] [blame] | 1143 | { |
| 1144 | // make sure our table is insync with our current #define for kSQRT_TABLE_SIZE |
| 1145 | SkASSERT(sizeof(gSqrt8Table) == kSQRT_TABLE_SIZE); |
| 1146 | |
| 1147 | rad_to_unit_matrix(center, radius, &fPtsToUnit); |
| 1148 | } |
reed@google.com | 61eb040 | 2011-04-15 12:11:12 +0000 | [diff] [blame] | 1149 | |
reed@google.com | dd5bd67 | 2011-09-20 15:56:13 +0000 | [diff] [blame^] | 1150 | virtual void shadeSpan(int x, int y, SkPMColor* SK_RESTRICT dstC, int count) { |
reed@android.com | 8a1c16f | 2008-12-17 15:59:43 +0000 | [diff] [blame] | 1151 | SkASSERT(count > 0); |
| 1152 | |
| 1153 | SkPoint srcPt; |
| 1154 | SkMatrix::MapXYProc dstProc = fDstToIndexProc; |
| 1155 | TileProc proc = fTileProc; |
reed@google.com | dd5bd67 | 2011-09-20 15:56:13 +0000 | [diff] [blame^] | 1156 | const SkPMColor* SK_RESTRICT cache = this->getCache32(); |
reed@android.com | 8a1c16f | 2008-12-17 15:59:43 +0000 | [diff] [blame] | 1157 | |
reed@google.com | 61eb040 | 2011-04-15 12:11:12 +0000 | [diff] [blame] | 1158 | if (fDstToIndexClass != kPerspective_MatrixClass) { |
reed@google.com | dc731fd | 2010-12-23 15:19:47 +0000 | [diff] [blame] | 1159 | dstProc(fDstToIndex, SkIntToScalar(x) + SK_ScalarHalf, |
| 1160 | SkIntToScalar(y) + SK_ScalarHalf, &srcPt); |
reed@android.com | 8a1c16f | 2008-12-17 15:59:43 +0000 | [diff] [blame] | 1161 | SkFixed dx, fx = SkScalarToFixed(srcPt.fX); |
| 1162 | SkFixed dy, fy = SkScalarToFixed(srcPt.fY); |
| 1163 | |
reed@google.com | 61eb040 | 2011-04-15 12:11:12 +0000 | [diff] [blame] | 1164 | if (fDstToIndexClass == kFixedStepInX_MatrixClass) { |
reed@android.com | 8a1c16f | 2008-12-17 15:59:43 +0000 | [diff] [blame] | 1165 | SkFixed storage[2]; |
| 1166 | (void)fDstToIndex.fixedStepInX(SkIntToScalar(y), &storage[0], &storage[1]); |
| 1167 | dx = storage[0]; |
| 1168 | dy = storage[1]; |
reed@google.com | 61eb040 | 2011-04-15 12:11:12 +0000 | [diff] [blame] | 1169 | } else { |
reed@android.com | 8a1c16f | 2008-12-17 15:59:43 +0000 | [diff] [blame] | 1170 | SkASSERT(fDstToIndexClass == kLinear_MatrixClass); |
| 1171 | dx = SkScalarToFixed(fDstToIndex.getScaleX()); |
| 1172 | dy = SkScalarToFixed(fDstToIndex.getSkewY()); |
| 1173 | } |
| 1174 | |
reed@google.com | 61eb040 | 2011-04-15 12:11:12 +0000 | [diff] [blame] | 1175 | if (proc == clamp_tileproc) { |
reed@google.com | dd5bd67 | 2011-09-20 15:56:13 +0000 | [diff] [blame^] | 1176 | const uint8_t* SK_RESTRICT sqrt_table = gSqrt8Table; |
reed@android.com | 8a1c16f | 2008-12-17 15:59:43 +0000 | [diff] [blame] | 1177 | fx >>= 1; |
| 1178 | dx >>= 1; |
| 1179 | fy >>= 1; |
| 1180 | dy >>= 1; |
| 1181 | do { |
| 1182 | unsigned xx = SkPin32(fx, -0xFFFF >> 1, 0xFFFF >> 1); |
| 1183 | unsigned fi = SkPin32(fy, -0xFFFF >> 1, 0xFFFF >> 1); |
| 1184 | fi = (xx * xx + fi * fi) >> (14 + 16 - kSQRT_TABLE_BITS); |
| 1185 | fi = SkFastMin32(fi, 0xFFFF >> (16 - kSQRT_TABLE_BITS)); |
| 1186 | *dstC++ = cache[sqrt_table[fi] >> (8 - kCache32Bits)]; |
| 1187 | fx += dx; |
| 1188 | fy += dy; |
| 1189 | } while (--count != 0); |
reed@google.com | 61eb040 | 2011-04-15 12:11:12 +0000 | [diff] [blame] | 1190 | } else if (proc == mirror_tileproc) { |
reed@android.com | 8a1c16f | 2008-12-17 15:59:43 +0000 | [diff] [blame] | 1191 | do { |
wjmaclean@chromium.org | 1fbf760 | 2011-04-13 13:31:06 +0000 | [diff] [blame] | 1192 | SkFixed magnitudeSquared = SkFixedSquare(fx) + SkFixedSquare(fy); |
| 1193 | if (magnitudeSquared < 0) // Overflow. |
| 1194 | magnitudeSquared = SK_FixedMax; |
| 1195 | SkFixed dist = SkFixedSqrt(magnitudeSquared); |
reed@android.com | 8a1c16f | 2008-12-17 15:59:43 +0000 | [diff] [blame] | 1196 | unsigned fi = mirror_tileproc(dist); |
| 1197 | SkASSERT(fi <= 0xFFFF); |
| 1198 | *dstC++ = cache[fi >> (16 - kCache32Bits)]; |
| 1199 | fx += dx; |
| 1200 | fy += dy; |
| 1201 | } while (--count != 0); |
reed@google.com | 61eb040 | 2011-04-15 12:11:12 +0000 | [diff] [blame] | 1202 | } else { |
reed@android.com | 8a1c16f | 2008-12-17 15:59:43 +0000 | [diff] [blame] | 1203 | SkASSERT(proc == repeat_tileproc); |
| 1204 | do { |
wjmaclean@chromium.org | 1fbf760 | 2011-04-13 13:31:06 +0000 | [diff] [blame] | 1205 | SkFixed magnitudeSquared = SkFixedSquare(fx) + SkFixedSquare(fy); |
| 1206 | if (magnitudeSquared < 0) // Overflow. |
| 1207 | magnitudeSquared = SK_FixedMax; |
| 1208 | SkFixed dist = SkFixedSqrt(magnitudeSquared); |
reed@android.com | 8a1c16f | 2008-12-17 15:59:43 +0000 | [diff] [blame] | 1209 | unsigned fi = repeat_tileproc(dist); |
| 1210 | SkASSERT(fi <= 0xFFFF); |
| 1211 | *dstC++ = cache[fi >> (16 - kCache32Bits)]; |
| 1212 | fx += dx; |
| 1213 | fy += dy; |
| 1214 | } while (--count != 0); |
| 1215 | } |
reed@google.com | 61eb040 | 2011-04-15 12:11:12 +0000 | [diff] [blame] | 1216 | } else { // perspective case |
reed@android.com | 8a1c16f | 2008-12-17 15:59:43 +0000 | [diff] [blame] | 1217 | SkScalar dstX = SkIntToScalar(x); |
| 1218 | SkScalar dstY = SkIntToScalar(y); |
| 1219 | do { |
| 1220 | dstProc(fDstToIndex, dstX, dstY, &srcPt); |
| 1221 | unsigned fi = proc(SkScalarToFixed(srcPt.length())); |
| 1222 | SkASSERT(fi <= 0xFFFF); |
| 1223 | *dstC++ = cache[fi >> (16 - kCache32Bits)]; |
| 1224 | dstX += SK_Scalar1; |
| 1225 | } while (--count != 0); |
| 1226 | } |
| 1227 | } |
reed@android.com | 3c9b2a4 | 2009-08-27 19:28:37 +0000 | [diff] [blame] | 1228 | |
reed@google.com | dd5bd67 | 2011-09-20 15:56:13 +0000 | [diff] [blame^] | 1229 | virtual void shadeSpan16(int x, int y, uint16_t* SK_RESTRICT dstC, int count) { |
reed@android.com | 8a1c16f | 2008-12-17 15:59:43 +0000 | [diff] [blame] | 1230 | SkASSERT(count > 0); |
| 1231 | |
| 1232 | SkPoint srcPt; |
| 1233 | SkMatrix::MapXYProc dstProc = fDstToIndexProc; |
| 1234 | TileProc proc = fTileProc; |
reed@google.com | dd5bd67 | 2011-09-20 15:56:13 +0000 | [diff] [blame^] | 1235 | const uint16_t* SK_RESTRICT cache = this->getCache16(); |
reed@android.com | 8a1c16f | 2008-12-17 15:59:43 +0000 | [diff] [blame] | 1236 | int toggle = ((x ^ y) & 1) << kCache16Bits; |
reed@android.com | 8a1c16f | 2008-12-17 15:59:43 +0000 | [diff] [blame] | 1237 | |
reed@android.com | 3c9b2a4 | 2009-08-27 19:28:37 +0000 | [diff] [blame] | 1238 | if (fDstToIndexClass != kPerspective_MatrixClass) { |
reed@google.com | dc731fd | 2010-12-23 15:19:47 +0000 | [diff] [blame] | 1239 | dstProc(fDstToIndex, SkIntToScalar(x) + SK_ScalarHalf, |
| 1240 | SkIntToScalar(y) + SK_ScalarHalf, &srcPt); |
reed@android.com | 8a1c16f | 2008-12-17 15:59:43 +0000 | [diff] [blame] | 1241 | SkFixed dx, fx = SkScalarToFixed(srcPt.fX); |
| 1242 | SkFixed dy, fy = SkScalarToFixed(srcPt.fY); |
| 1243 | |
reed@android.com | 3c9b2a4 | 2009-08-27 19:28:37 +0000 | [diff] [blame] | 1244 | if (fDstToIndexClass == kFixedStepInX_MatrixClass) { |
reed@android.com | 8a1c16f | 2008-12-17 15:59:43 +0000 | [diff] [blame] | 1245 | SkFixed storage[2]; |
| 1246 | (void)fDstToIndex.fixedStepInX(SkIntToScalar(y), &storage[0], &storage[1]); |
| 1247 | dx = storage[0]; |
| 1248 | dy = storage[1]; |
reed@android.com | 3c9b2a4 | 2009-08-27 19:28:37 +0000 | [diff] [blame] | 1249 | } else { |
reed@android.com | 8a1c16f | 2008-12-17 15:59:43 +0000 | [diff] [blame] | 1250 | SkASSERT(fDstToIndexClass == kLinear_MatrixClass); |
| 1251 | dx = SkScalarToFixed(fDstToIndex.getScaleX()); |
| 1252 | dy = SkScalarToFixed(fDstToIndex.getSkewY()); |
| 1253 | } |
| 1254 | |
reed@android.com | 3c9b2a4 | 2009-08-27 19:28:37 +0000 | [diff] [blame] | 1255 | if (proc == clamp_tileproc) { |
reed@google.com | dd5bd67 | 2011-09-20 15:56:13 +0000 | [diff] [blame^] | 1256 | const uint8_t* SK_RESTRICT sqrt_table = gSqrt8Table; |
reed@android.com | 8a1c16f | 2008-12-17 15:59:43 +0000 | [diff] [blame] | 1257 | |
| 1258 | /* knock these down so we can pin against +- 0x7FFF, which is an immediate load, |
| 1259 | rather than 0xFFFF which is slower. This is a compromise, since it reduces our |
| 1260 | precision, but that appears to be visually OK. If we decide this is OK for |
| 1261 | all of our cases, we could (it seems) put this scale-down into fDstToIndex, |
| 1262 | to avoid having to do these extra shifts each time. |
| 1263 | */ |
| 1264 | fx >>= 1; |
| 1265 | dx >>= 1; |
| 1266 | fy >>= 1; |
| 1267 | dy >>= 1; |
reed@android.com | 3c9b2a4 | 2009-08-27 19:28:37 +0000 | [diff] [blame] | 1268 | 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] | 1269 | fy = SkPin32(fy, -0xFFFF >> 1, 0xFFFF >> 1); |
| 1270 | fy *= fy; |
| 1271 | do { |
| 1272 | unsigned xx = SkPin32(fx, -0xFFFF >> 1, 0xFFFF >> 1); |
| 1273 | unsigned fi = (xx * xx + fy) >> (14 + 16 - kSQRT_TABLE_BITS); |
| 1274 | fi = SkFastMin32(fi, 0xFFFF >> (16 - kSQRT_TABLE_BITS)); |
| 1275 | fx += dx; |
reed@android.com | 8a1c16f | 2008-12-17 15:59:43 +0000 | [diff] [blame] | 1276 | *dstC++ = cache[toggle + (sqrt_table[fi] >> (8 - kCache16Bits))]; |
| 1277 | toggle ^= (1 << kCache16Bits); |
reed@android.com | 8a1c16f | 2008-12-17 15:59:43 +0000 | [diff] [blame] | 1278 | } while (--count != 0); |
reed@android.com | 3c9b2a4 | 2009-08-27 19:28:37 +0000 | [diff] [blame] | 1279 | } else { |
reed@android.com | 8a1c16f | 2008-12-17 15:59:43 +0000 | [diff] [blame] | 1280 | do { |
| 1281 | unsigned xx = SkPin32(fx, -0xFFFF >> 1, 0xFFFF >> 1); |
| 1282 | unsigned fi = SkPin32(fy, -0xFFFF >> 1, 0xFFFF >> 1); |
| 1283 | fi = (xx * xx + fi * fi) >> (14 + 16 - kSQRT_TABLE_BITS); |
| 1284 | fi = SkFastMin32(fi, 0xFFFF >> (16 - kSQRT_TABLE_BITS)); |
| 1285 | fx += dx; |
| 1286 | fy += dy; |
reed@android.com | 8a1c16f | 2008-12-17 15:59:43 +0000 | [diff] [blame] | 1287 | *dstC++ = cache[toggle + (sqrt_table[fi] >> (8 - kCache16Bits))]; |
| 1288 | toggle ^= (1 << kCache16Bits); |
reed@android.com | 8a1c16f | 2008-12-17 15:59:43 +0000 | [diff] [blame] | 1289 | } while (--count != 0); |
| 1290 | } |
reed@android.com | 3c9b2a4 | 2009-08-27 19:28:37 +0000 | [diff] [blame] | 1291 | } else if (proc == mirror_tileproc) { |
reed@android.com | 8a1c16f | 2008-12-17 15:59:43 +0000 | [diff] [blame] | 1292 | do { |
| 1293 | SkFixed dist = SkFixedSqrt(SkFixedSquare(fx) + SkFixedSquare(fy)); |
| 1294 | unsigned fi = mirror_tileproc(dist); |
| 1295 | SkASSERT(fi <= 0xFFFF); |
| 1296 | fx += dx; |
| 1297 | fy += dy; |
reed@android.com | 8a1c16f | 2008-12-17 15:59:43 +0000 | [diff] [blame] | 1298 | *dstC++ = cache[toggle + (fi >> (16 - kCache16Bits))]; |
| 1299 | toggle ^= (1 << kCache16Bits); |
reed@android.com | 8a1c16f | 2008-12-17 15:59:43 +0000 | [diff] [blame] | 1300 | } while (--count != 0); |
reed@android.com | 3c9b2a4 | 2009-08-27 19:28:37 +0000 | [diff] [blame] | 1301 | } else { |
reed@android.com | 8a1c16f | 2008-12-17 15:59:43 +0000 | [diff] [blame] | 1302 | SkASSERT(proc == repeat_tileproc); |
| 1303 | do { |
| 1304 | SkFixed dist = SkFixedSqrt(SkFixedSquare(fx) + SkFixedSquare(fy)); |
| 1305 | unsigned fi = repeat_tileproc(dist); |
| 1306 | SkASSERT(fi <= 0xFFFF); |
| 1307 | fx += dx; |
| 1308 | fy += dy; |
reed@android.com | 8a1c16f | 2008-12-17 15:59:43 +0000 | [diff] [blame] | 1309 | *dstC++ = cache[toggle + (fi >> (16 - kCache16Bits))]; |
| 1310 | toggle ^= (1 << kCache16Bits); |
reed@android.com | 8a1c16f | 2008-12-17 15:59:43 +0000 | [diff] [blame] | 1311 | } while (--count != 0); |
| 1312 | } |
reed@android.com | 3c9b2a4 | 2009-08-27 19:28:37 +0000 | [diff] [blame] | 1313 | } else { // perspective case |
reed@android.com | 8a1c16f | 2008-12-17 15:59:43 +0000 | [diff] [blame] | 1314 | SkScalar dstX = SkIntToScalar(x); |
| 1315 | SkScalar dstY = SkIntToScalar(y); |
| 1316 | do { |
| 1317 | dstProc(fDstToIndex, dstX, dstY, &srcPt); |
| 1318 | unsigned fi = proc(SkScalarToFixed(srcPt.length())); |
| 1319 | SkASSERT(fi <= 0xFFFF); |
| 1320 | |
| 1321 | int index = fi >> (16 - kCache16Bits); |
reed@android.com | 8a1c16f | 2008-12-17 15:59:43 +0000 | [diff] [blame] | 1322 | *dstC++ = cache[toggle + index]; |
| 1323 | toggle ^= (1 << kCache16Bits); |
reed@android.com | 8a1c16f | 2008-12-17 15:59:43 +0000 | [diff] [blame] | 1324 | |
| 1325 | dstX += SK_Scalar1; |
| 1326 | } while (--count != 0); |
| 1327 | } |
| 1328 | } |
| 1329 | |
reed@google.com | 55b8e8c | 2011-01-13 16:22:35 +0000 | [diff] [blame] | 1330 | virtual BitmapType asABitmap(SkBitmap* bitmap, |
| 1331 | SkMatrix* matrix, |
reed@google.com | dc731fd | 2010-12-23 15:19:47 +0000 | [diff] [blame] | 1332 | TileMode* xy, |
reed@google.com | 7c2f27d | 2011-03-07 19:29:00 +0000 | [diff] [blame] | 1333 | SkScalar* twoPointRadialParams) const { |
reed@google.com | dc731fd | 2010-12-23 15:19:47 +0000 | [diff] [blame] | 1334 | if (bitmap) { |
| 1335 | this->commonAsABitmap(bitmap); |
| 1336 | } |
| 1337 | if (matrix) { |
| 1338 | matrix->setScale(SkIntToScalar(kCache32Count), SkIntToScalar(kCache32Count)); |
| 1339 | matrix->preConcat(fPtsToUnit); |
| 1340 | } |
| 1341 | if (xy) { |
| 1342 | xy[0] = fTileMode; |
| 1343 | xy[1] = kClamp_TileMode; |
| 1344 | } |
| 1345 | return kRadial_BitmapType; |
| 1346 | } |
vandebo@chromium.org | d3ae779 | 2011-02-24 00:21:06 +0000 | [diff] [blame] | 1347 | virtual GradientType asAGradient(GradientInfo* info) const { |
| 1348 | if (info) { |
| 1349 | commonAsAGradient(info); |
| 1350 | info->fPoint[0] = fCenter; |
| 1351 | info->fRadius[0] = fRadius; |
| 1352 | } |
| 1353 | return kRadial_GradientType; |
| 1354 | } |
reed@google.com | 55b8e8c | 2011-01-13 16:22:35 +0000 | [diff] [blame] | 1355 | |
| 1356 | static SkFlattenable* CreateProc(SkFlattenableReadBuffer& buffer) { |
reed@android.com | 8a1c16f | 2008-12-17 15:59:43 +0000 | [diff] [blame] | 1357 | return SkNEW_ARGS(Radial_Gradient, (buffer)); |
| 1358 | } |
| 1359 | |
vandebo@chromium.org | d3ae779 | 2011-02-24 00:21:06 +0000 | [diff] [blame] | 1360 | virtual void flatten(SkFlattenableWriteBuffer& buffer) { |
| 1361 | this->INHERITED::flatten(buffer); |
| 1362 | buffer.writeScalar(fCenter.fX); |
| 1363 | buffer.writeScalar(fCenter.fY); |
| 1364 | buffer.writeScalar(fRadius); |
| 1365 | } |
| 1366 | |
reed@android.com | 8a1c16f | 2008-12-17 15:59:43 +0000 | [diff] [blame] | 1367 | protected: |
vandebo@chromium.org | d3ae779 | 2011-02-24 00:21:06 +0000 | [diff] [blame] | 1368 | Radial_Gradient(SkFlattenableReadBuffer& buffer) |
| 1369 | : Gradient_Shader(buffer), |
tomhudson@google.com | 9ce767c | 2011-04-25 20:49:39 +0000 | [diff] [blame] | 1370 | fCenter(unflatten_point(buffer)), |
vandebo@chromium.org | d3ae779 | 2011-02-24 00:21:06 +0000 | [diff] [blame] | 1371 | fRadius(buffer.readScalar()) { |
| 1372 | } |
reed@android.com | 8a1c16f | 2008-12-17 15:59:43 +0000 | [diff] [blame] | 1373 | virtual Factory getFactory() { return CreateProc; } |
| 1374 | |
| 1375 | private: |
| 1376 | typedef Gradient_Shader INHERITED; |
vandebo@chromium.org | d3ae779 | 2011-02-24 00:21:06 +0000 | [diff] [blame] | 1377 | const SkPoint fCenter; |
| 1378 | const SkScalar fRadius; |
reed@android.com | 8a1c16f | 2008-12-17 15:59:43 +0000 | [diff] [blame] | 1379 | }; |
| 1380 | |
senorblanco@chromium.org | 7ef071f | 2009-09-22 17:25:29 +0000 | [diff] [blame] | 1381 | /* Two-point radial gradients are specified by two circles, each with a center |
| 1382 | point and radius. The gradient can be considered to be a series of |
| 1383 | concentric circles, with the color interpolated from the start circle |
| 1384 | (at t=0) to the end circle (at t=1). |
| 1385 | |
| 1386 | For each point (x, y) in the span, we want to find the |
| 1387 | interpolated circle that intersects that point. The center |
| 1388 | of the desired circle (Cx, Cy) falls at some distance t |
| 1389 | along the line segment between the start point (Sx, Sy) and |
| 1390 | end point (Ex, Ey): |
reed@google.com | 55b8e8c | 2011-01-13 16:22:35 +0000 | [diff] [blame] | 1391 | |
senorblanco@chromium.org | 7ef071f | 2009-09-22 17:25:29 +0000 | [diff] [blame] | 1392 | Cx = (1 - t) * Sx + t * Ex (0 <= t <= 1) |
| 1393 | Cy = (1 - t) * Sy + t * Ey |
reed@google.com | 55b8e8c | 2011-01-13 16:22:35 +0000 | [diff] [blame] | 1394 | |
senorblanco@chromium.org | 7ef071f | 2009-09-22 17:25:29 +0000 | [diff] [blame] | 1395 | The radius of the desired circle (r) is also a linear interpolation t |
| 1396 | between the start and end radii (Sr and Er): |
reed@google.com | 55b8e8c | 2011-01-13 16:22:35 +0000 | [diff] [blame] | 1397 | |
senorblanco@chromium.org | 7ef071f | 2009-09-22 17:25:29 +0000 | [diff] [blame] | 1398 | r = (1 - t) * Sr + t * Er |
reed@google.com | 55b8e8c | 2011-01-13 16:22:35 +0000 | [diff] [blame] | 1399 | |
senorblanco@chromium.org | 7ef071f | 2009-09-22 17:25:29 +0000 | [diff] [blame] | 1400 | But |
reed@google.com | 55b8e8c | 2011-01-13 16:22:35 +0000 | [diff] [blame] | 1401 | |
senorblanco@chromium.org | 7ef071f | 2009-09-22 17:25:29 +0000 | [diff] [blame] | 1402 | (x - Cx)^2 + (y - Cy)^2 = r^2 |
reed@google.com | 55b8e8c | 2011-01-13 16:22:35 +0000 | [diff] [blame] | 1403 | |
senorblanco@chromium.org | 7ef071f | 2009-09-22 17:25:29 +0000 | [diff] [blame] | 1404 | so |
reed@google.com | 55b8e8c | 2011-01-13 16:22:35 +0000 | [diff] [blame] | 1405 | |
senorblanco@chromium.org | 7ef071f | 2009-09-22 17:25:29 +0000 | [diff] [blame] | 1406 | (x - ((1 - t) * Sx + t * Ex))^2 |
| 1407 | + (y - ((1 - t) * Sy + t * Ey))^2 |
| 1408 | = ((1 - t) * Sr + t * Er)^2 |
reed@google.com | 55b8e8c | 2011-01-13 16:22:35 +0000 | [diff] [blame] | 1409 | |
senorblanco@chromium.org | 7ef071f | 2009-09-22 17:25:29 +0000 | [diff] [blame] | 1410 | Solving for t yields |
reed@google.com | 55b8e8c | 2011-01-13 16:22:35 +0000 | [diff] [blame] | 1411 | |
senorblanco@chromium.org | 7ef071f | 2009-09-22 17:25:29 +0000 | [diff] [blame] | 1412 | [(Sx - Ex)^2 + (Sy - Ey)^2 - (Er - Sr)^2)] * t^2 |
| 1413 | + [2 * (Sx - Ex)(x - Sx) + 2 * (Sy - Ey)(y - Sy) - 2 * (Er - Sr) * Sr] * t |
| 1414 | + [(x - Sx)^2 + (y - Sy)^2 - Sr^2] = 0 |
reed@google.com | 55b8e8c | 2011-01-13 16:22:35 +0000 | [diff] [blame] | 1415 | |
senorblanco@chromium.org | 7ef071f | 2009-09-22 17:25:29 +0000 | [diff] [blame] | 1416 | To simplify, let Dx = Sx - Ex, Dy = Sy - Ey, Dr = Er - Sr, dx = x - Sx, dy = y - Sy |
| 1417 | |
| 1418 | [Dx^2 + Dy^2 - Dr^2)] * t^2 |
| 1419 | + 2 * [Dx * dx + Dy * dy - Dr * Sr] * t |
| 1420 | + [dx^2 + dy^2 - Sr^2] = 0 |
reed@google.com | 55b8e8c | 2011-01-13 16:22:35 +0000 | [diff] [blame] | 1421 | |
| 1422 | 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] | 1423 | possible circles on which the point may fall. Solving for t yields |
| 1424 | the gradient value to use. |
reed@google.com | 55b8e8c | 2011-01-13 16:22:35 +0000 | [diff] [blame] | 1425 | |
senorblanco@chromium.org | 7ef071f | 2009-09-22 17:25:29 +0000 | [diff] [blame] | 1426 | If a<0, the start circle is entirely contained in the |
| 1427 | end circle, and one of the roots will be <0 or >1 (off the line |
| 1428 | segment). If a>0, the start circle falls at least partially |
| 1429 | outside the end circle (or vice versa), and the gradient |
| 1430 | defines a "tube" where a point may be on one circle (on the |
| 1431 | inside of the tube) or the other (outside of the tube). We choose |
| 1432 | one arbitrarily. |
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 | In order to keep the math to within the limits of fixed point, |
| 1435 | we divide the entire quadratic by Dr^2, and replace |
| 1436 | (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] | 1437 | |
senorblanco@chromium.org | 7ef071f | 2009-09-22 17:25:29 +0000 | [diff] [blame] | 1438 | [Dx^2 / Dr^2 + Dy^2 / Dr^2 - 1)] * t^2 |
| 1439 | + 2 * [x' * Dx / Dr + y' * Dy / Dr - Sr / Dr] * t |
| 1440 | + [x'^2 + y'^2 - Sr^2/Dr^2] = 0 |
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 | (x' and y' are computed by appending the subtract and scale to the |
| 1443 | fDstToIndex matrix in the constructor). |
| 1444 | |
| 1445 | Since the 'A' component of the quadratic is independent of x' and y', it |
| 1446 | is precomputed in the constructor. Since the 'B' component is linear in |
| 1447 | 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] | 1448 | 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] | 1449 | a perspective projection), it must be computed in the loop. |
| 1450 | |
| 1451 | */ |
| 1452 | |
reed@google.com | 84e9c08 | 2011-04-13 17:44:24 +0000 | [diff] [blame] | 1453 | static inline SkFixed two_point_radial(SkScalar b, SkScalar fx, SkScalar fy, |
| 1454 | SkScalar sr2d2, SkScalar foura, |
| 1455 | SkScalar oneOverTwoA, bool posRoot) { |
| 1456 | SkScalar c = SkScalarSquare(fx) + SkScalarSquare(fy) - sr2d2; |
reed@google.com | 8871a84 | 2011-06-23 15:07:04 +0000 | [diff] [blame] | 1457 | if (0 == foura) { |
| 1458 | return SkScalarToFixed(SkScalarDiv(-c, b)); |
| 1459 | } |
| 1460 | |
reed@google.com | 84e9c08 | 2011-04-13 17:44:24 +0000 | [diff] [blame] | 1461 | SkScalar discrim = SkScalarSquare(b) - SkScalarMul(foura, c); |
senorblanco@chromium.org | 7ef071f | 2009-09-22 17:25:29 +0000 | [diff] [blame] | 1462 | if (discrim < 0) { |
| 1463 | discrim = -discrim; |
| 1464 | } |
reed@google.com | 84e9c08 | 2011-04-13 17:44:24 +0000 | [diff] [blame] | 1465 | SkScalar rootDiscrim = SkScalarSqrt(discrim); |
| 1466 | SkScalar result; |
senorblanco@chromium.org | 7ef071f | 2009-09-22 17:25:29 +0000 | [diff] [blame] | 1467 | if (posRoot) { |
reed@google.com | 84e9c08 | 2011-04-13 17:44:24 +0000 | [diff] [blame] | 1468 | result = SkScalarMul(-b + rootDiscrim, oneOverTwoA); |
senorblanco@chromium.org | 7ef071f | 2009-09-22 17:25:29 +0000 | [diff] [blame] | 1469 | } else { |
reed@google.com | 84e9c08 | 2011-04-13 17:44:24 +0000 | [diff] [blame] | 1470 | result = SkScalarMul(-b - rootDiscrim, oneOverTwoA); |
senorblanco@chromium.org | 7ef071f | 2009-09-22 17:25:29 +0000 | [diff] [blame] | 1471 | } |
reed@google.com | 84e9c08 | 2011-04-13 17:44:24 +0000 | [diff] [blame] | 1472 | return SkScalarToFixed(result); |
senorblanco@chromium.org | 7ef071f | 2009-09-22 17:25:29 +0000 | [diff] [blame] | 1473 | } |
| 1474 | |
| 1475 | class Two_Point_Radial_Gradient : public Gradient_Shader { |
| 1476 | public: |
| 1477 | Two_Point_Radial_Gradient(const SkPoint& start, SkScalar startRadius, |
| 1478 | const SkPoint& end, SkScalar endRadius, |
| 1479 | const SkColor colors[], const SkScalar pos[], |
| 1480 | int colorCount, SkShader::TileMode mode, |
| 1481 | SkUnitMapper* mapper) |
vandebo@chromium.org | d3ae779 | 2011-02-24 00:21:06 +0000 | [diff] [blame] | 1482 | : Gradient_Shader(colors, pos, colorCount, mode, mapper), |
| 1483 | fCenter1(start), |
| 1484 | fCenter2(end), |
| 1485 | fRadius1(startRadius), |
| 1486 | fRadius2(endRadius) { |
| 1487 | init(); |
senorblanco@chromium.org | 7ef071f | 2009-09-22 17:25:29 +0000 | [diff] [blame] | 1488 | } |
reed@google.com | 55b8e8c | 2011-01-13 16:22:35 +0000 | [diff] [blame] | 1489 | |
| 1490 | virtual BitmapType asABitmap(SkBitmap* bitmap, |
| 1491 | SkMatrix* matrix, |
reed@google.com | dc731fd | 2010-12-23 15:19:47 +0000 | [diff] [blame] | 1492 | TileMode* xy, |
reed@google.com | 7c2f27d | 2011-03-07 19:29:00 +0000 | [diff] [blame] | 1493 | SkScalar* twoPointRadialParams) const { |
reed@google.com | dc731fd | 2010-12-23 15:19:47 +0000 | [diff] [blame] | 1494 | if (bitmap) { |
| 1495 | this->commonAsABitmap(bitmap); |
| 1496 | } |
| 1497 | SkScalar diffL = 0; // just to avoid gcc warning |
| 1498 | if (matrix || twoPointRadialParams) { |
reed@google.com | 55b8e8c | 2011-01-13 16:22:35 +0000 | [diff] [blame] | 1499 | diffL = SkScalarSqrt(SkScalarSquare(fDiff.fX) + |
reed@google.com | dc731fd | 2010-12-23 15:19:47 +0000 | [diff] [blame] | 1500 | SkScalarSquare(fDiff.fY)); |
| 1501 | } |
| 1502 | if (matrix) { |
bsalomon@google.com | dc66c42 | 2011-04-06 19:35:37 +0000 | [diff] [blame] | 1503 | if (diffL) { |
| 1504 | SkScalar invDiffL = SkScalarInvert(diffL); |
| 1505 | matrix->setSinCos(-SkScalarMul(invDiffL, fDiff.fY), |
| 1506 | SkScalarMul(invDiffL, fDiff.fX)); |
| 1507 | } else { |
| 1508 | matrix->reset(); |
| 1509 | } |
reed@google.com | dc731fd | 2010-12-23 15:19:47 +0000 | [diff] [blame] | 1510 | matrix->preConcat(fPtsToUnit); |
| 1511 | } |
| 1512 | if (xy) { |
| 1513 | xy[0] = fTileMode; |
| 1514 | xy[1] = kClamp_TileMode; |
| 1515 | } |
| 1516 | if (NULL != twoPointRadialParams) { |
| 1517 | twoPointRadialParams[0] = diffL; |
| 1518 | twoPointRadialParams[1] = fStartRadius; |
| 1519 | twoPointRadialParams[2] = fDiffRadius; |
| 1520 | } |
| 1521 | return kTwoPointRadial_BitmapType; |
| 1522 | } |
reed@google.com | 55b8e8c | 2011-01-13 16:22:35 +0000 | [diff] [blame] | 1523 | |
vandebo@chromium.org | d3ae779 | 2011-02-24 00:21:06 +0000 | [diff] [blame] | 1524 | virtual GradientType asAGradient(GradientInfo* info) const { |
| 1525 | if (info) { |
| 1526 | commonAsAGradient(info); |
| 1527 | info->fPoint[0] = fCenter1; |
| 1528 | info->fPoint[1] = fCenter2; |
| 1529 | info->fRadius[0] = fRadius1; |
| 1530 | info->fRadius[1] = fRadius2; |
| 1531 | } |
| 1532 | return kRadial2_GradientType; |
| 1533 | } |
| 1534 | |
reed@google.com | dd5bd67 | 2011-09-20 15:56:13 +0000 | [diff] [blame^] | 1535 | virtual void shadeSpan(int x, int y, SkPMColor* SK_RESTRICT dstC, int count) { |
senorblanco@chromium.org | 7ef071f | 2009-09-22 17:25:29 +0000 | [diff] [blame] | 1536 | SkASSERT(count > 0); |
| 1537 | |
| 1538 | // Zero difference between radii: fill with transparent black. |
| 1539 | if (fDiffRadius == 0) { |
| 1540 | sk_bzero(dstC, count * sizeof(*dstC)); |
| 1541 | return; |
| 1542 | } |
| 1543 | SkMatrix::MapXYProc dstProc = fDstToIndexProc; |
| 1544 | TileProc proc = fTileProc; |
reed@google.com | dd5bd67 | 2011-09-20 15:56:13 +0000 | [diff] [blame^] | 1545 | const SkPMColor* SK_RESTRICT cache = this->getCache32(); |
reed@google.com | 84e9c08 | 2011-04-13 17:44:24 +0000 | [diff] [blame] | 1546 | |
| 1547 | SkScalar foura = fA * 4; |
senorblanco@chromium.org | 7ef071f | 2009-09-22 17:25:29 +0000 | [diff] [blame] | 1548 | bool posRoot = fDiffRadius < 0; |
reed@google.com | 61eb040 | 2011-04-15 12:11:12 +0000 | [diff] [blame] | 1549 | if (fDstToIndexClass != kPerspective_MatrixClass) { |
senorblanco@chromium.org | 7ef071f | 2009-09-22 17:25:29 +0000 | [diff] [blame] | 1550 | SkPoint srcPt; |
reed@google.com | dc731fd | 2010-12-23 15:19:47 +0000 | [diff] [blame] | 1551 | dstProc(fDstToIndex, SkIntToScalar(x) + SK_ScalarHalf, |
| 1552 | SkIntToScalar(y) + SK_ScalarHalf, &srcPt); |
reed@google.com | 84e9c08 | 2011-04-13 17:44:24 +0000 | [diff] [blame] | 1553 | SkScalar dx, fx = srcPt.fX; |
| 1554 | SkScalar dy, fy = srcPt.fY; |
senorblanco@chromium.org | 7ef071f | 2009-09-22 17:25:29 +0000 | [diff] [blame] | 1555 | |
reed@google.com | 61eb040 | 2011-04-15 12:11:12 +0000 | [diff] [blame] | 1556 | if (fDstToIndexClass == kFixedStepInX_MatrixClass) { |
reed@google.com | 84e9c08 | 2011-04-13 17:44:24 +0000 | [diff] [blame] | 1557 | SkFixed fixedX, fixedY; |
| 1558 | (void)fDstToIndex.fixedStepInX(SkIntToScalar(y), &fixedX, &fixedY); |
| 1559 | dx = SkFixedToScalar(fixedX); |
| 1560 | dy = SkFixedToScalar(fixedY); |
reed@google.com | 61eb040 | 2011-04-15 12:11:12 +0000 | [diff] [blame] | 1561 | } else { |
senorblanco@chromium.org | 7ef071f | 2009-09-22 17:25:29 +0000 | [diff] [blame] | 1562 | SkASSERT(fDstToIndexClass == kLinear_MatrixClass); |
reed@google.com | 84e9c08 | 2011-04-13 17:44:24 +0000 | [diff] [blame] | 1563 | dx = fDstToIndex.getScaleX(); |
| 1564 | dy = fDstToIndex.getSkewY(); |
senorblanco@chromium.org | 7ef071f | 2009-09-22 17:25:29 +0000 | [diff] [blame] | 1565 | } |
reed@google.com | 84e9c08 | 2011-04-13 17:44:24 +0000 | [diff] [blame] | 1566 | SkScalar b = (SkScalarMul(fDiff.fX, fx) + |
| 1567 | SkScalarMul(fDiff.fY, fy) - fStartRadius) * 2; |
| 1568 | SkScalar db = (SkScalarMul(fDiff.fX, dx) + |
| 1569 | SkScalarMul(fDiff.fY, dy)) * 2; |
reed@google.com | 61eb040 | 2011-04-15 12:11:12 +0000 | [diff] [blame] | 1570 | if (proc == clamp_tileproc) { |
senorblanco@chromium.org | 7ef071f | 2009-09-22 17:25:29 +0000 | [diff] [blame] | 1571 | for (; count > 0; --count) { |
reed@google.com | 84e9c08 | 2011-04-13 17:44:24 +0000 | [diff] [blame] | 1572 | 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] | 1573 | SkFixed index = SkClampMax(t, 0xFFFF); |
| 1574 | SkASSERT(index <= 0xFFFF); |
| 1575 | *dstC++ = cache[index >> (16 - kCache32Bits)]; |
| 1576 | fx += dx; |
| 1577 | fy += dy; |
| 1578 | b += db; |
| 1579 | } |
reed@google.com | 61eb040 | 2011-04-15 12:11:12 +0000 | [diff] [blame] | 1580 | } else if (proc == mirror_tileproc) { |
senorblanco@chromium.org | 7ef071f | 2009-09-22 17:25:29 +0000 | [diff] [blame] | 1581 | for (; count > 0; --count) { |
reed@google.com | 84e9c08 | 2011-04-13 17:44:24 +0000 | [diff] [blame] | 1582 | 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] | 1583 | SkFixed index = mirror_tileproc(t); |
| 1584 | SkASSERT(index <= 0xFFFF); |
| 1585 | *dstC++ = cache[index >> (16 - kCache32Bits)]; |
| 1586 | fx += dx; |
| 1587 | fy += dy; |
| 1588 | b += db; |
| 1589 | } |
reed@google.com | 61eb040 | 2011-04-15 12:11:12 +0000 | [diff] [blame] | 1590 | } else { |
senorblanco@chromium.org | 7ef071f | 2009-09-22 17:25:29 +0000 | [diff] [blame] | 1591 | SkASSERT(proc == repeat_tileproc); |
| 1592 | for (; count > 0; --count) { |
reed@google.com | 84e9c08 | 2011-04-13 17:44:24 +0000 | [diff] [blame] | 1593 | 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] | 1594 | SkFixed index = repeat_tileproc(t); |
| 1595 | SkASSERT(index <= 0xFFFF); |
| 1596 | *dstC++ = cache[index >> (16 - kCache32Bits)]; |
| 1597 | fx += dx; |
| 1598 | fy += dy; |
| 1599 | b += db; |
| 1600 | } |
| 1601 | } |
reed@google.com | 61eb040 | 2011-04-15 12:11:12 +0000 | [diff] [blame] | 1602 | } else { // perspective case |
reed@android.com | 6c59a17 | 2009-09-22 20:24:05 +0000 | [diff] [blame] | 1603 | SkScalar dstX = SkIntToScalar(x); |
| 1604 | SkScalar dstY = SkIntToScalar(y); |
senorblanco@chromium.org | 7ef071f | 2009-09-22 17:25:29 +0000 | [diff] [blame] | 1605 | for (; count > 0; --count) { |
| 1606 | SkPoint srcPt; |
reed@android.com | 6c59a17 | 2009-09-22 20:24:05 +0000 | [diff] [blame] | 1607 | dstProc(fDstToIndex, dstX, dstY, &srcPt); |
reed@google.com | 84e9c08 | 2011-04-13 17:44:24 +0000 | [diff] [blame] | 1608 | SkScalar fx = srcPt.fX; |
| 1609 | SkScalar fy = srcPt.fY; |
| 1610 | SkScalar b = (SkScalarMul(fDiff.fX, fx) + |
| 1611 | SkScalarMul(fDiff.fY, fy) - fStartRadius) * 2; |
| 1612 | 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] | 1613 | SkFixed index = proc(t); |
| 1614 | SkASSERT(index <= 0xFFFF); |
| 1615 | *dstC++ = cache[index >> (16 - kCache32Bits)]; |
reed@android.com | 6c59a17 | 2009-09-22 20:24:05 +0000 | [diff] [blame] | 1616 | dstX += SK_Scalar1; |
senorblanco@chromium.org | 7ef071f | 2009-09-22 17:25:29 +0000 | [diff] [blame] | 1617 | } |
| 1618 | } |
| 1619 | } |
| 1620 | |
reed@android.com | 6c59a17 | 2009-09-22 20:24:05 +0000 | [diff] [blame] | 1621 | virtual bool setContext(const SkBitmap& device, |
| 1622 | const SkPaint& paint, |
| 1623 | const SkMatrix& matrix) { |
| 1624 | if (!this->INHERITED::setContext(device, paint, matrix)) { |
| 1625 | return false; |
| 1626 | } |
| 1627 | |
| 1628 | // we don't have a span16 proc |
| 1629 | fFlags &= ~kHasSpan16_Flag; |
| 1630 | return true; |
| 1631 | } |
| 1632 | |
reed@google.com | 55b8e8c | 2011-01-13 16:22:35 +0000 | [diff] [blame] | 1633 | static SkFlattenable* CreateProc(SkFlattenableReadBuffer& buffer) { |
senorblanco@chromium.org | 7ef071f | 2009-09-22 17:25:29 +0000 | [diff] [blame] | 1634 | return SkNEW_ARGS(Two_Point_Radial_Gradient, (buffer)); |
| 1635 | } |
| 1636 | |
reed@android.com | bcfc733 | 2009-11-10 16:19:39 +0000 | [diff] [blame] | 1637 | virtual void flatten(SkFlattenableWriteBuffer& buffer) { |
| 1638 | this->INHERITED::flatten(buffer); |
vandebo@chromium.org | d3ae779 | 2011-02-24 00:21:06 +0000 | [diff] [blame] | 1639 | buffer.writeScalar(fCenter1.fX); |
| 1640 | buffer.writeScalar(fCenter1.fY); |
| 1641 | buffer.writeScalar(fCenter2.fX); |
| 1642 | buffer.writeScalar(fCenter2.fY); |
| 1643 | buffer.writeScalar(fRadius1); |
| 1644 | buffer.writeScalar(fRadius2); |
reed@android.com | bcfc733 | 2009-11-10 16:19:39 +0000 | [diff] [blame] | 1645 | } |
reed@google.com | 55b8e8c | 2011-01-13 16:22:35 +0000 | [diff] [blame] | 1646 | |
senorblanco@chromium.org | 7ef071f | 2009-09-22 17:25:29 +0000 | [diff] [blame] | 1647 | protected: |
reed@android.com | bcfc733 | 2009-11-10 16:19:39 +0000 | [diff] [blame] | 1648 | Two_Point_Radial_Gradient(SkFlattenableReadBuffer& buffer) |
vandebo@chromium.org | d3ae779 | 2011-02-24 00:21:06 +0000 | [diff] [blame] | 1649 | : Gradient_Shader(buffer), |
tomhudson@google.com | 9ce767c | 2011-04-25 20:49:39 +0000 | [diff] [blame] | 1650 | fCenter1(unflatten_point(buffer)), |
| 1651 | fCenter2(unflatten_point(buffer)), |
vandebo@chromium.org | d3ae779 | 2011-02-24 00:21:06 +0000 | [diff] [blame] | 1652 | fRadius1(buffer.readScalar()), |
| 1653 | fRadius2(buffer.readScalar()) { |
| 1654 | init(); |
reed@android.com | bcfc733 | 2009-11-10 16:19:39 +0000 | [diff] [blame] | 1655 | }; |
senorblanco@chromium.org | 7ef071f | 2009-09-22 17:25:29 +0000 | [diff] [blame] | 1656 | virtual Factory getFactory() { return CreateProc; } |
senorblanco@chromium.org | 7ef071f | 2009-09-22 17:25:29 +0000 | [diff] [blame] | 1657 | |
| 1658 | private: |
| 1659 | typedef Gradient_Shader INHERITED; |
vandebo@chromium.org | d3ae779 | 2011-02-24 00:21:06 +0000 | [diff] [blame] | 1660 | const SkPoint fCenter1; |
| 1661 | const SkPoint fCenter2; |
| 1662 | const SkScalar fRadius1; |
| 1663 | const SkScalar fRadius2; |
senorblanco@chromium.org | 7ef071f | 2009-09-22 17:25:29 +0000 | [diff] [blame] | 1664 | SkPoint fDiff; |
| 1665 | SkScalar fStartRadius, fDiffRadius, fSr2D2, fA, fOneOverTwoA; |
vandebo@chromium.org | d3ae779 | 2011-02-24 00:21:06 +0000 | [diff] [blame] | 1666 | |
| 1667 | void init() { |
| 1668 | fDiff = fCenter1 - fCenter2; |
| 1669 | fDiffRadius = fRadius2 - fRadius1; |
| 1670 | SkScalar inv = SkScalarInvert(fDiffRadius); |
| 1671 | fDiff.fX = SkScalarMul(fDiff.fX, inv); |
| 1672 | fDiff.fY = SkScalarMul(fDiff.fY, inv); |
| 1673 | fStartRadius = SkScalarMul(fRadius1, inv); |
| 1674 | fSr2D2 = SkScalarSquare(fStartRadius); |
| 1675 | fA = SkScalarSquare(fDiff.fX) + SkScalarSquare(fDiff.fY) - SK_Scalar1; |
reed@google.com | 21031e9 | 2011-06-27 18:38:27 +0000 | [diff] [blame] | 1676 | fOneOverTwoA = fA ? SkScalarInvert(fA * 2) : 0; |
vandebo@chromium.org | d3ae779 | 2011-02-24 00:21:06 +0000 | [diff] [blame] | 1677 | |
| 1678 | fPtsToUnit.setTranslate(-fCenter1.fX, -fCenter1.fY); |
| 1679 | fPtsToUnit.postScale(inv, inv); |
| 1680 | } |
senorblanco@chromium.org | 7ef071f | 2009-09-22 17:25:29 +0000 | [diff] [blame] | 1681 | }; |
| 1682 | |
reed@android.com | 8a1c16f | 2008-12-17 15:59:43 +0000 | [diff] [blame] | 1683 | /////////////////////////////////////////////////////////////////////////////// |
| 1684 | |
| 1685 | class Sweep_Gradient : public Gradient_Shader { |
| 1686 | public: |
| 1687 | Sweep_Gradient(SkScalar cx, SkScalar cy, const SkColor colors[], |
| 1688 | const SkScalar pos[], int count, SkUnitMapper* mapper) |
vandebo@chromium.org | d3ae779 | 2011-02-24 00:21:06 +0000 | [diff] [blame] | 1689 | : Gradient_Shader(colors, pos, count, SkShader::kClamp_TileMode, mapper), |
| 1690 | fCenter(SkPoint::Make(cx, cy)) |
reed@android.com | 8a1c16f | 2008-12-17 15:59:43 +0000 | [diff] [blame] | 1691 | { |
| 1692 | fPtsToUnit.setTranslate(-cx, -cy); |
| 1693 | } |
| 1694 | virtual void shadeSpan(int x, int y, SkPMColor dstC[], int count); |
| 1695 | 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] | 1696 | |
| 1697 | virtual BitmapType asABitmap(SkBitmap* bitmap, |
| 1698 | SkMatrix* matrix, |
reed@google.com | dc731fd | 2010-12-23 15:19:47 +0000 | [diff] [blame] | 1699 | TileMode* xy, |
reed@google.com | 7c2f27d | 2011-03-07 19:29:00 +0000 | [diff] [blame] | 1700 | SkScalar* twoPointRadialParams) const { |
reed@google.com | dc731fd | 2010-12-23 15:19:47 +0000 | [diff] [blame] | 1701 | if (bitmap) { |
| 1702 | this->commonAsABitmap(bitmap); |
| 1703 | } |
| 1704 | if (matrix) { |
| 1705 | *matrix = fPtsToUnit; |
| 1706 | } |
| 1707 | if (xy) { |
| 1708 | xy[0] = fTileMode; |
| 1709 | xy[1] = kClamp_TileMode; |
| 1710 | } |
| 1711 | return kSweep_BitmapType; |
| 1712 | } |
| 1713 | |
vandebo@chromium.org | d3ae779 | 2011-02-24 00:21:06 +0000 | [diff] [blame] | 1714 | virtual GradientType asAGradient(GradientInfo* info) const { |
| 1715 | if (info) { |
| 1716 | commonAsAGradient(info); |
| 1717 | info->fPoint[0] = fCenter; |
| 1718 | } |
| 1719 | return kSweep_GradientType; |
| 1720 | } |
| 1721 | |
reed@android.com | 8a1c16f | 2008-12-17 15:59:43 +0000 | [diff] [blame] | 1722 | static SkFlattenable* CreateProc(SkFlattenableReadBuffer& buffer) { |
| 1723 | return SkNEW_ARGS(Sweep_Gradient, (buffer)); |
| 1724 | } |
| 1725 | |
vandebo@chromium.org | d3ae779 | 2011-02-24 00:21:06 +0000 | [diff] [blame] | 1726 | virtual void flatten(SkFlattenableWriteBuffer& buffer) { |
| 1727 | this->INHERITED::flatten(buffer); |
| 1728 | buffer.writeScalar(fCenter.fX); |
| 1729 | buffer.writeScalar(fCenter.fY); |
| 1730 | } |
| 1731 | |
reed@android.com | 8a1c16f | 2008-12-17 15:59:43 +0000 | [diff] [blame] | 1732 | protected: |
vandebo@chromium.org | d3ae779 | 2011-02-24 00:21:06 +0000 | [diff] [blame] | 1733 | Sweep_Gradient(SkFlattenableReadBuffer& buffer) |
| 1734 | : Gradient_Shader(buffer), |
tomhudson@google.com | 9ce767c | 2011-04-25 20:49:39 +0000 | [diff] [blame] | 1735 | fCenter(unflatten_point(buffer)) { |
vandebo@chromium.org | d3ae779 | 2011-02-24 00:21:06 +0000 | [diff] [blame] | 1736 | } |
| 1737 | |
reed@android.com | 8a1c16f | 2008-12-17 15:59:43 +0000 | [diff] [blame] | 1738 | virtual Factory getFactory() { return CreateProc; } |
| 1739 | |
| 1740 | private: |
| 1741 | typedef Gradient_Shader INHERITED; |
vandebo@chromium.org | d3ae779 | 2011-02-24 00:21:06 +0000 | [diff] [blame] | 1742 | const SkPoint fCenter; |
reed@android.com | 8a1c16f | 2008-12-17 15:59:43 +0000 | [diff] [blame] | 1743 | }; |
| 1744 | |
| 1745 | #ifdef COMPUTE_SWEEP_TABLE |
| 1746 | #define PI 3.14159265 |
| 1747 | static bool gSweepTableReady; |
| 1748 | static uint8_t gSweepTable[65]; |
| 1749 | |
| 1750 | /* Our table stores precomputed values for atan: [0...1] -> [0..PI/4] |
| 1751 | We scale the results to [0..32] |
| 1752 | */ |
reed@google.com | 61eb040 | 2011-04-15 12:11:12 +0000 | [diff] [blame] | 1753 | static const uint8_t* build_sweep_table() { |
| 1754 | if (!gSweepTableReady) { |
reed@android.com | 8a1c16f | 2008-12-17 15:59:43 +0000 | [diff] [blame] | 1755 | const int N = 65; |
| 1756 | const double DENOM = N - 1; |
reed@google.com | 55b8e8c | 2011-01-13 16:22:35 +0000 | [diff] [blame] | 1757 | |
reed@android.com | 8a1c16f | 2008-12-17 15:59:43 +0000 | [diff] [blame] | 1758 | for (int i = 0; i < N; i++) |
| 1759 | { |
| 1760 | double arg = i / DENOM; |
| 1761 | double v = atan(arg); |
| 1762 | int iv = (int)round(v * DENOM * 2 / PI); |
| 1763 | // printf("[%d] atan(%g) = %g %d\n", i, arg, v, iv); |
| 1764 | printf("%d, ", iv); |
| 1765 | gSweepTable[i] = iv; |
| 1766 | } |
| 1767 | gSweepTableReady = true; |
| 1768 | } |
| 1769 | return gSweepTable; |
| 1770 | } |
| 1771 | #else |
| 1772 | static const uint8_t gSweepTable[] = { |
| 1773 | 0, 1, 1, 2, 3, 3, 4, 4, 5, 6, 6, 7, 8, 8, 9, 9, |
| 1774 | 10, 11, 11, 12, 12, 13, 13, 14, 15, 15, 16, 16, 17, 17, 18, 18, |
| 1775 | 19, 19, 20, 20, 21, 21, 22, 22, 23, 23, 24, 24, 25, 25, 25, 26, |
| 1776 | 26, 27, 27, 27, 28, 28, 29, 29, 29, 30, 30, 30, 31, 31, 31, 32, |
| 1777 | 32 |
| 1778 | }; |
| 1779 | static const uint8_t* build_sweep_table() { return gSweepTable; } |
| 1780 | #endif |
| 1781 | |
| 1782 | // divide numer/denom, with a bias of 6bits. Assumes numer <= denom |
| 1783 | // and denom != 0. Since our table is 6bits big (+1), this is a nice fit. |
| 1784 | // Same as (but faster than) SkFixedDiv(numer, denom) >> 10 |
| 1785 | |
| 1786 | //unsigned div_64(int numer, int denom); |
reed@google.com | 61eb040 | 2011-04-15 12:11:12 +0000 | [diff] [blame] | 1787 | static unsigned div_64(int numer, int denom) { |
reed@android.com | 8a1c16f | 2008-12-17 15:59:43 +0000 | [diff] [blame] | 1788 | SkASSERT(numer <= denom); |
| 1789 | SkASSERT(numer > 0); |
| 1790 | SkASSERT(denom > 0); |
reed@google.com | 55b8e8c | 2011-01-13 16:22:35 +0000 | [diff] [blame] | 1791 | |
reed@android.com | 8a1c16f | 2008-12-17 15:59:43 +0000 | [diff] [blame] | 1792 | int nbits = SkCLZ(numer); |
| 1793 | int dbits = SkCLZ(denom); |
| 1794 | int bits = 6 - nbits + dbits; |
| 1795 | SkASSERT(bits <= 6); |
reed@google.com | 55b8e8c | 2011-01-13 16:22:35 +0000 | [diff] [blame] | 1796 | |
reed@google.com | 61eb040 | 2011-04-15 12:11:12 +0000 | [diff] [blame] | 1797 | if (bits < 0) { // detect underflow |
reed@android.com | 8a1c16f | 2008-12-17 15:59:43 +0000 | [diff] [blame] | 1798 | return 0; |
reed@google.com | 61eb040 | 2011-04-15 12:11:12 +0000 | [diff] [blame] | 1799 | } |
reed@android.com | 8a1c16f | 2008-12-17 15:59:43 +0000 | [diff] [blame] | 1800 | |
| 1801 | denom <<= dbits - 1; |
| 1802 | numer <<= nbits - 1; |
| 1803 | |
| 1804 | unsigned result = 0; |
| 1805 | |
| 1806 | // do the first one |
reed@google.com | 61eb040 | 2011-04-15 12:11:12 +0000 | [diff] [blame] | 1807 | if ((numer -= denom) >= 0) { |
reed@android.com | 8a1c16f | 2008-12-17 15:59:43 +0000 | [diff] [blame] | 1808 | result = 1; |
reed@google.com | 61eb040 | 2011-04-15 12:11:12 +0000 | [diff] [blame] | 1809 | } else { |
reed@android.com | 8a1c16f | 2008-12-17 15:59:43 +0000 | [diff] [blame] | 1810 | numer += denom; |
reed@google.com | 61eb040 | 2011-04-15 12:11:12 +0000 | [diff] [blame] | 1811 | } |
reed@google.com | 55b8e8c | 2011-01-13 16:22:35 +0000 | [diff] [blame] | 1812 | |
reed@android.com | 8a1c16f | 2008-12-17 15:59:43 +0000 | [diff] [blame] | 1813 | // 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] | 1814 | if (bits > 0) { |
reed@android.com | 8a1c16f | 2008-12-17 15:59:43 +0000 | [diff] [blame] | 1815 | // make room for the rest of the answer bits |
| 1816 | result <<= bits; |
| 1817 | switch (bits) { |
| 1818 | case 6: |
| 1819 | if ((numer = (numer << 1) - denom) >= 0) |
| 1820 | result |= 32; |
| 1821 | else |
| 1822 | numer += denom; |
| 1823 | case 5: |
| 1824 | if ((numer = (numer << 1) - denom) >= 0) |
| 1825 | result |= 16; |
| 1826 | else |
| 1827 | numer += denom; |
| 1828 | case 4: |
| 1829 | if ((numer = (numer << 1) - denom) >= 0) |
| 1830 | result |= 8; |
| 1831 | else |
| 1832 | numer += denom; |
| 1833 | case 3: |
| 1834 | if ((numer = (numer << 1) - denom) >= 0) |
| 1835 | result |= 4; |
| 1836 | else |
| 1837 | numer += denom; |
| 1838 | case 2: |
| 1839 | if ((numer = (numer << 1) - denom) >= 0) |
| 1840 | result |= 2; |
| 1841 | else |
| 1842 | numer += denom; |
| 1843 | case 1: |
| 1844 | default: // not strictly need, but makes GCC make better ARM code |
| 1845 | if ((numer = (numer << 1) - denom) >= 0) |
| 1846 | result |= 1; |
| 1847 | else |
| 1848 | numer += denom; |
| 1849 | } |
| 1850 | } |
| 1851 | return result; |
| 1852 | } |
| 1853 | |
| 1854 | // 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] | 1855 | static unsigned atan_0_90(SkFixed y, SkFixed x) { |
reed@android.com | 8a1c16f | 2008-12-17 15:59:43 +0000 | [diff] [blame] | 1856 | #ifdef SK_DEBUG |
| 1857 | { |
| 1858 | static bool gOnce; |
reed@google.com | 61eb040 | 2011-04-15 12:11:12 +0000 | [diff] [blame] | 1859 | if (!gOnce) { |
reed@android.com | 8a1c16f | 2008-12-17 15:59:43 +0000 | [diff] [blame] | 1860 | gOnce = true; |
| 1861 | SkASSERT(div_64(55, 55) == 64); |
| 1862 | SkASSERT(div_64(128, 256) == 32); |
| 1863 | SkASSERT(div_64(2326528, 4685824) == 31); |
| 1864 | SkASSERT(div_64(753664, 5210112) == 9); |
| 1865 | SkASSERT(div_64(229376, 4882432) == 3); |
| 1866 | SkASSERT(div_64(2, 64) == 2); |
| 1867 | SkASSERT(div_64(1, 64) == 1); |
| 1868 | // test that we handle underflow correctly |
| 1869 | SkASSERT(div_64(12345, 0x54321234) == 0); |
| 1870 | } |
| 1871 | } |
| 1872 | #endif |
| 1873 | |
| 1874 | SkASSERT(y > 0 && x > 0); |
| 1875 | const uint8_t* table = build_sweep_table(); |
| 1876 | |
| 1877 | unsigned result; |
| 1878 | bool swap = (x < y); |
reed@google.com | 61eb040 | 2011-04-15 12:11:12 +0000 | [diff] [blame] | 1879 | if (swap) { |
reed@android.com | 8a1c16f | 2008-12-17 15:59:43 +0000 | [diff] [blame] | 1880 | // first part of the atan(v) = PI/2 - atan(1/v) identity |
| 1881 | // since our div_64 and table want v <= 1, where v = y/x |
| 1882 | SkTSwap<SkFixed>(x, y); |
| 1883 | } |
| 1884 | |
| 1885 | result = div_64(y, x); |
reed@google.com | 55b8e8c | 2011-01-13 16:22:35 +0000 | [diff] [blame] | 1886 | |
reed@android.com | 8a1c16f | 2008-12-17 15:59:43 +0000 | [diff] [blame] | 1887 | #ifdef SK_DEBUG |
| 1888 | { |
| 1889 | unsigned result2 = SkDivBits(y, x, 6); |
| 1890 | SkASSERT(result2 == result || |
| 1891 | (result == 1 && result2 == 0)); |
| 1892 | } |
| 1893 | #endif |
| 1894 | |
| 1895 | SkASSERT(result < SK_ARRAY_COUNT(gSweepTable)); |
| 1896 | result = table[result]; |
| 1897 | |
reed@google.com | 61eb040 | 2011-04-15 12:11:12 +0000 | [diff] [blame] | 1898 | if (swap) { |
reed@android.com | 8a1c16f | 2008-12-17 15:59:43 +0000 | [diff] [blame] | 1899 | // complete the atan(v) = PI/2 - atan(1/v) identity |
| 1900 | result = 64 - result; |
| 1901 | // pin to 63 |
| 1902 | result -= result >> 6; |
| 1903 | } |
| 1904 | |
| 1905 | SkASSERT(result <= 63); |
| 1906 | return result; |
| 1907 | } |
| 1908 | |
| 1909 | // returns angle in a circle [0..2PI) -> [0..255] |
reed@google.com | 61eb040 | 2011-04-15 12:11:12 +0000 | [diff] [blame] | 1910 | static unsigned SkATan2_255(SkFixed y, SkFixed x) { |
| 1911 | if (x == 0) { |
| 1912 | if (y == 0) { |
reed@android.com | 8a1c16f | 2008-12-17 15:59:43 +0000 | [diff] [blame] | 1913 | return 0; |
reed@google.com | 61eb040 | 2011-04-15 12:11:12 +0000 | [diff] [blame] | 1914 | } |
reed@android.com | 8a1c16f | 2008-12-17 15:59:43 +0000 | [diff] [blame] | 1915 | return y < 0 ? 192 : 64; |
| 1916 | } |
reed@google.com | 61eb040 | 2011-04-15 12:11:12 +0000 | [diff] [blame] | 1917 | if (y == 0) { |
reed@android.com | 8a1c16f | 2008-12-17 15:59:43 +0000 | [diff] [blame] | 1918 | return x < 0 ? 128 : 0; |
reed@google.com | 61eb040 | 2011-04-15 12:11:12 +0000 | [diff] [blame] | 1919 | } |
reed@google.com | 55b8e8c | 2011-01-13 16:22:35 +0000 | [diff] [blame] | 1920 | |
reed@android.com | 8a1c16f | 2008-12-17 15:59:43 +0000 | [diff] [blame] | 1921 | /* Find the right quadrant for x,y |
| 1922 | Since atan_0_90 only handles the first quadrant, we rotate x,y |
| 1923 | appropriately before calling it, and then add the right amount |
| 1924 | to account for the real quadrant. |
| 1925 | quadrant 0 : add 0 | x > 0 && y > 0 |
| 1926 | quadrant 1 : add 64 (90 degrees) | x < 0 && y > 0 |
| 1927 | quadrant 2 : add 128 (180 degrees) | x < 0 && y < 0 |
| 1928 | quadrant 3 : add 192 (270 degrees) | x > 0 && y < 0 |
reed@google.com | 55b8e8c | 2011-01-13 16:22:35 +0000 | [diff] [blame] | 1929 | |
reed@android.com | 8a1c16f | 2008-12-17 15:59:43 +0000 | [diff] [blame] | 1930 | map x<0 to (1 << 6) |
| 1931 | map y<0 to (3 << 6) |
| 1932 | add = map_x ^ map_y |
| 1933 | */ |
| 1934 | int xsign = x >> 31; |
| 1935 | int ysign = y >> 31; |
| 1936 | int add = ((-xsign) ^ (ysign & 3)) << 6; |
| 1937 | |
| 1938 | #ifdef SK_DEBUG |
| 1939 | if (0 == add) |
| 1940 | SkASSERT(x > 0 && y > 0); |
| 1941 | else if (64 == add) |
| 1942 | SkASSERT(x < 0 && y > 0); |
| 1943 | else if (128 == add) |
| 1944 | SkASSERT(x < 0 && y < 0); |
| 1945 | else if (192 == add) |
| 1946 | SkASSERT(x > 0 && y < 0); |
| 1947 | else |
| 1948 | SkASSERT(!"bad value for add"); |
| 1949 | #endif |
reed@google.com | 55b8e8c | 2011-01-13 16:22:35 +0000 | [diff] [blame] | 1950 | |
reed@android.com | 8a1c16f | 2008-12-17 15:59:43 +0000 | [diff] [blame] | 1951 | /* This ^ trick makes x, y positive, and the swap<> handles quadrants |
| 1952 | where we need to rotate x,y by 90 or -90 |
| 1953 | */ |
| 1954 | x = (x ^ xsign) - xsign; |
| 1955 | y = (y ^ ysign) - ysign; |
reed@google.com | 61eb040 | 2011-04-15 12:11:12 +0000 | [diff] [blame] | 1956 | 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] | 1957 | SkTSwap<SkFixed>(x, y); |
reed@google.com | 61eb040 | 2011-04-15 12:11:12 +0000 | [diff] [blame] | 1958 | } |
reed@android.com | 8a1c16f | 2008-12-17 15:59:43 +0000 | [diff] [blame] | 1959 | |
| 1960 | unsigned result = add + atan_0_90(y, x); |
| 1961 | SkASSERT(result < 256); |
| 1962 | return result; |
| 1963 | } |
| 1964 | |
reed@google.com | dd5bd67 | 2011-09-20 15:56:13 +0000 | [diff] [blame^] | 1965 | void Sweep_Gradient::shadeSpan(int x, int y, SkPMColor* SK_RESTRICT dstC, int count) { |
reed@android.com | 8a1c16f | 2008-12-17 15:59:43 +0000 | [diff] [blame] | 1966 | SkMatrix::MapXYProc proc = fDstToIndexProc; |
| 1967 | const SkMatrix& matrix = fDstToIndex; |
reed@google.com | dd5bd67 | 2011-09-20 15:56:13 +0000 | [diff] [blame^] | 1968 | const SkPMColor* SK_RESTRICT cache = this->getCache32(); |
reed@android.com | 8a1c16f | 2008-12-17 15:59:43 +0000 | [diff] [blame] | 1969 | SkPoint srcPt; |
reed@google.com | 55b8e8c | 2011-01-13 16:22:35 +0000 | [diff] [blame] | 1970 | |
reed@google.com | 61eb040 | 2011-04-15 12:11:12 +0000 | [diff] [blame] | 1971 | if (fDstToIndexClass != kPerspective_MatrixClass) { |
reed@android.com | 8a1c16f | 2008-12-17 15:59:43 +0000 | [diff] [blame] | 1972 | proc(matrix, SkIntToScalar(x) + SK_ScalarHalf, |
| 1973 | SkIntToScalar(y) + SK_ScalarHalf, &srcPt); |
| 1974 | SkFixed dx, fx = SkScalarToFixed(srcPt.fX); |
| 1975 | SkFixed dy, fy = SkScalarToFixed(srcPt.fY); |
reed@google.com | 55b8e8c | 2011-01-13 16:22:35 +0000 | [diff] [blame] | 1976 | |
reed@google.com | 61eb040 | 2011-04-15 12:11:12 +0000 | [diff] [blame] | 1977 | if (fDstToIndexClass == kFixedStepInX_MatrixClass) { |
reed@android.com | 8a1c16f | 2008-12-17 15:59:43 +0000 | [diff] [blame] | 1978 | SkFixed storage[2]; |
| 1979 | (void)matrix.fixedStepInX(SkIntToScalar(y) + SK_ScalarHalf, |
| 1980 | &storage[0], &storage[1]); |
| 1981 | dx = storage[0]; |
| 1982 | dy = storage[1]; |
reed@google.com | 61eb040 | 2011-04-15 12:11:12 +0000 | [diff] [blame] | 1983 | } else { |
reed@android.com | 8a1c16f | 2008-12-17 15:59:43 +0000 | [diff] [blame] | 1984 | SkASSERT(fDstToIndexClass == kLinear_MatrixClass); |
| 1985 | dx = SkScalarToFixed(matrix.getScaleX()); |
| 1986 | dy = SkScalarToFixed(matrix.getSkewY()); |
| 1987 | } |
reed@google.com | 55b8e8c | 2011-01-13 16:22:35 +0000 | [diff] [blame] | 1988 | |
reed@google.com | 61eb040 | 2011-04-15 12:11:12 +0000 | [diff] [blame] | 1989 | for (; count > 0; --count) { |
reed@android.com | 8a1c16f | 2008-12-17 15:59:43 +0000 | [diff] [blame] | 1990 | *dstC++ = cache[SkATan2_255(fy, fx)]; |
| 1991 | fx += dx; |
| 1992 | fy += dy; |
| 1993 | } |
reed@google.com | 61eb040 | 2011-04-15 12:11:12 +0000 | [diff] [blame] | 1994 | } else { // perspective case |
| 1995 | for (int stop = x + count; x < stop; x++) { |
reed@android.com | 8a1c16f | 2008-12-17 15:59:43 +0000 | [diff] [blame] | 1996 | proc(matrix, SkIntToScalar(x) + SK_ScalarHalf, |
| 1997 | SkIntToScalar(y) + SK_ScalarHalf, &srcPt); |
reed@google.com | 55b8e8c | 2011-01-13 16:22:35 +0000 | [diff] [blame] | 1998 | |
reed@android.com | 8a1c16f | 2008-12-17 15:59:43 +0000 | [diff] [blame] | 1999 | int index = SkATan2_255(SkScalarToFixed(srcPt.fY), |
| 2000 | SkScalarToFixed(srcPt.fX)); |
| 2001 | *dstC++ = cache[index]; |
| 2002 | } |
| 2003 | } |
| 2004 | } |
| 2005 | |
reed@google.com | dd5bd67 | 2011-09-20 15:56:13 +0000 | [diff] [blame^] | 2006 | void Sweep_Gradient::shadeSpan16(int x, int y, uint16_t* SK_RESTRICT dstC, int count) { |
reed@android.com | 8a1c16f | 2008-12-17 15:59:43 +0000 | [diff] [blame] | 2007 | SkMatrix::MapXYProc proc = fDstToIndexProc; |
| 2008 | const SkMatrix& matrix = fDstToIndex; |
reed@google.com | dd5bd67 | 2011-09-20 15:56:13 +0000 | [diff] [blame^] | 2009 | const uint16_t* SK_RESTRICT cache = this->getCache16(); |
reed@android.com | 8a1c16f | 2008-12-17 15:59:43 +0000 | [diff] [blame] | 2010 | int toggle = ((x ^ y) & 1) << kCache16Bits; |
| 2011 | SkPoint srcPt; |
| 2012 | |
reed@google.com | 61eb040 | 2011-04-15 12:11:12 +0000 | [diff] [blame] | 2013 | if (fDstToIndexClass != kPerspective_MatrixClass) { |
reed@android.com | 8a1c16f | 2008-12-17 15:59:43 +0000 | [diff] [blame] | 2014 | proc(matrix, SkIntToScalar(x) + SK_ScalarHalf, |
| 2015 | SkIntToScalar(y) + SK_ScalarHalf, &srcPt); |
| 2016 | SkFixed dx, fx = SkScalarToFixed(srcPt.fX); |
| 2017 | SkFixed dy, fy = SkScalarToFixed(srcPt.fY); |
reed@google.com | 55b8e8c | 2011-01-13 16:22:35 +0000 | [diff] [blame] | 2018 | |
reed@google.com | 61eb040 | 2011-04-15 12:11:12 +0000 | [diff] [blame] | 2019 | if (fDstToIndexClass == kFixedStepInX_MatrixClass) { |
reed@android.com | 8a1c16f | 2008-12-17 15:59:43 +0000 | [diff] [blame] | 2020 | SkFixed storage[2]; |
| 2021 | (void)matrix.fixedStepInX(SkIntToScalar(y) + SK_ScalarHalf, |
| 2022 | &storage[0], &storage[1]); |
| 2023 | dx = storage[0]; |
| 2024 | dy = storage[1]; |
reed@google.com | 61eb040 | 2011-04-15 12:11:12 +0000 | [diff] [blame] | 2025 | } else { |
reed@android.com | 8a1c16f | 2008-12-17 15:59:43 +0000 | [diff] [blame] | 2026 | SkASSERT(fDstToIndexClass == kLinear_MatrixClass); |
| 2027 | dx = SkScalarToFixed(matrix.getScaleX()); |
| 2028 | dy = SkScalarToFixed(matrix.getSkewY()); |
| 2029 | } |
reed@google.com | 55b8e8c | 2011-01-13 16:22:35 +0000 | [diff] [blame] | 2030 | |
reed@google.com | 61eb040 | 2011-04-15 12:11:12 +0000 | [diff] [blame] | 2031 | for (; count > 0; --count) { |
reed@android.com | 8a1c16f | 2008-12-17 15:59:43 +0000 | [diff] [blame] | 2032 | int index = SkATan2_255(fy, fx) >> (8 - kCache16Bits); |
| 2033 | *dstC++ = cache[toggle + index]; |
| 2034 | toggle ^= (1 << kCache16Bits); |
| 2035 | fx += dx; |
| 2036 | fy += dy; |
| 2037 | } |
reed@google.com | 61eb040 | 2011-04-15 12:11:12 +0000 | [diff] [blame] | 2038 | } else { // perspective case |
| 2039 | for (int stop = x + count; x < stop; x++) { |
reed@android.com | 8a1c16f | 2008-12-17 15:59:43 +0000 | [diff] [blame] | 2040 | proc(matrix, SkIntToScalar(x) + SK_ScalarHalf, |
| 2041 | SkIntToScalar(y) + SK_ScalarHalf, &srcPt); |
reed@google.com | 55b8e8c | 2011-01-13 16:22:35 +0000 | [diff] [blame] | 2042 | |
reed@android.com | 8a1c16f | 2008-12-17 15:59:43 +0000 | [diff] [blame] | 2043 | int index = SkATan2_255(SkScalarToFixed(srcPt.fY), |
| 2044 | SkScalarToFixed(srcPt.fX)); |
| 2045 | index >>= (8 - kCache16Bits); |
| 2046 | *dstC++ = cache[toggle + index]; |
| 2047 | toggle ^= (1 << kCache16Bits); |
| 2048 | } |
| 2049 | } |
| 2050 | } |
| 2051 | |
reed@google.com | 61eb040 | 2011-04-15 12:11:12 +0000 | [diff] [blame] | 2052 | /////////////////////////////////////////////////////////////////////////////// |
| 2053 | /////////////////////////////////////////////////////////////////////////////// |
reed@android.com | 8a1c16f | 2008-12-17 15:59:43 +0000 | [diff] [blame] | 2054 | |
| 2055 | // assumes colors is SkColor* and pos is SkScalar* |
| 2056 | #define EXPAND_1_COLOR(count) \ |
| 2057 | SkColor tmp[2]; \ |
| 2058 | do { \ |
| 2059 | if (1 == count) { \ |
| 2060 | tmp[0] = tmp[1] = colors[0]; \ |
| 2061 | colors = tmp; \ |
| 2062 | pos = NULL; \ |
| 2063 | count = 2; \ |
| 2064 | } \ |
| 2065 | } while (0) |
| 2066 | |
reed@google.com | 61eb040 | 2011-04-15 12:11:12 +0000 | [diff] [blame] | 2067 | SkShader* SkGradientShader::CreateLinear(const SkPoint pts[2], |
| 2068 | const SkColor colors[], |
| 2069 | const SkScalar pos[], int colorCount, |
| 2070 | SkShader::TileMode mode, |
| 2071 | SkUnitMapper* mapper) { |
reed@android.com | 8a1c16f | 2008-12-17 15:59:43 +0000 | [diff] [blame] | 2072 | if (NULL == pts || NULL == colors || colorCount < 1) { |
| 2073 | return NULL; |
| 2074 | } |
| 2075 | EXPAND_1_COLOR(colorCount); |
| 2076 | |
reed@android.com | ab840b8 | 2009-07-01 17:00:03 +0000 | [diff] [blame] | 2077 | return SkNEW_ARGS(Linear_Gradient, |
| 2078 | (pts, colors, pos, colorCount, mode, mapper)); |
reed@android.com | 8a1c16f | 2008-12-17 15:59:43 +0000 | [diff] [blame] | 2079 | } |
| 2080 | |
reed@google.com | 61eb040 | 2011-04-15 12:11:12 +0000 | [diff] [blame] | 2081 | SkShader* SkGradientShader::CreateRadial(const SkPoint& center, SkScalar radius, |
| 2082 | const SkColor colors[], |
| 2083 | const SkScalar pos[], int colorCount, |
| 2084 | SkShader::TileMode mode, |
| 2085 | SkUnitMapper* mapper) { |
reed@android.com | 8a1c16f | 2008-12-17 15:59:43 +0000 | [diff] [blame] | 2086 | if (radius <= 0 || NULL == colors || colorCount < 1) { |
| 2087 | return NULL; |
| 2088 | } |
| 2089 | EXPAND_1_COLOR(colorCount); |
| 2090 | |
reed@android.com | ab840b8 | 2009-07-01 17:00:03 +0000 | [diff] [blame] | 2091 | return SkNEW_ARGS(Radial_Gradient, |
| 2092 | (center, radius, colors, pos, colorCount, mode, mapper)); |
reed@android.com | 8a1c16f | 2008-12-17 15:59:43 +0000 | [diff] [blame] | 2093 | } |
| 2094 | |
senorblanco@chromium.org | 7ef071f | 2009-09-22 17:25:29 +0000 | [diff] [blame] | 2095 | SkShader* SkGradientShader::CreateTwoPointRadial(const SkPoint& start, |
| 2096 | SkScalar startRadius, |
| 2097 | const SkPoint& end, |
| 2098 | SkScalar endRadius, |
| 2099 | const SkColor colors[], |
| 2100 | const SkScalar pos[], |
| 2101 | int colorCount, |
| 2102 | SkShader::TileMode mode, |
reed@google.com | 61eb040 | 2011-04-15 12:11:12 +0000 | [diff] [blame] | 2103 | SkUnitMapper* mapper) { |
senorblanco@chromium.org | 7ef071f | 2009-09-22 17:25:29 +0000 | [diff] [blame] | 2104 | if (startRadius < 0 || endRadius < 0 || NULL == colors || colorCount < 1) { |
| 2105 | return NULL; |
| 2106 | } |
| 2107 | EXPAND_1_COLOR(colorCount); |
| 2108 | |
| 2109 | return SkNEW_ARGS(Two_Point_Radial_Gradient, |
reed@google.com | 61eb040 | 2011-04-15 12:11:12 +0000 | [diff] [blame] | 2110 | (start, startRadius, end, endRadius, colors, pos, |
| 2111 | colorCount, mode, mapper)); |
senorblanco@chromium.org | 7ef071f | 2009-09-22 17:25:29 +0000 | [diff] [blame] | 2112 | } |
| 2113 | |
reed@android.com | 8a1c16f | 2008-12-17 15:59:43 +0000 | [diff] [blame] | 2114 | SkShader* SkGradientShader::CreateSweep(SkScalar cx, SkScalar cy, |
| 2115 | const SkColor colors[], |
| 2116 | const SkScalar pos[], |
reed@google.com | 61eb040 | 2011-04-15 12:11:12 +0000 | [diff] [blame] | 2117 | int count, SkUnitMapper* mapper) { |
reed@android.com | 8a1c16f | 2008-12-17 15:59:43 +0000 | [diff] [blame] | 2118 | if (NULL == colors || count < 1) { |
| 2119 | return NULL; |
| 2120 | } |
| 2121 | EXPAND_1_COLOR(count); |
| 2122 | |
| 2123 | return SkNEW_ARGS(Sweep_Gradient, (cx, cy, colors, pos, count, mapper)); |
| 2124 | } |
| 2125 | |
| 2126 | static SkFlattenable::Registrar gLinearGradientReg("Linear_Gradient", |
| 2127 | Linear_Gradient::CreateProc); |
| 2128 | |
| 2129 | static SkFlattenable::Registrar gRadialGradientReg("Radial_Gradient", |
| 2130 | Radial_Gradient::CreateProc); |
| 2131 | |
| 2132 | static SkFlattenable::Registrar gSweepGradientReg("Sweep_Gradient", |
| 2133 | Sweep_Gradient::CreateProc); |
tomhudson@google.com | 938d604 | 2011-04-27 13:57:03 +0000 | [diff] [blame] | 2134 | |
| 2135 | static SkFlattenable::Registrar |
| 2136 | gTwoPointRadialGradientReg("Two_Point_Radial_Gradient", |
| 2137 | Two_Point_Radial_Gradient::CreateProc); |