reed@google.com | 0e734bd | 2011-12-08 17:24:44 +0000 | [diff] [blame^] | 1 | |
epoger@google.com | ec3ed6a | 2011-07-28 14:26:00 +0000 | [diff] [blame] | 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 | 51baf5a | 2011-09-21 13:38:36 +0000 | [diff] [blame] | 18 | #if defined(SK_SCALAR_IS_FLOAT) && !defined(SK_DONT_USE_FLOAT_SQRT) |
| 19 | #define SK_USE_FLOAT_SQRT |
| 20 | #endif |
| 21 | |
reed@google.com | 0e734bd | 2011-12-08 17:24:44 +0000 | [diff] [blame^] | 22 | #ifndef SK_DISABLE_DITHER_32BIT_GRADIENT |
| 23 | #define USE_DITHER_32BIT_GRADIENT |
| 24 | #endif |
| 25 | |
reed@google.com | 5eb158d | 2011-04-15 15:50:34 +0000 | [diff] [blame] | 26 | static void sk_memset32_dither(uint32_t dst[], uint32_t v0, uint32_t v1, |
| 27 | int count) { |
| 28 | if (count > 0) { |
| 29 | if (v0 == v1) { |
| 30 | sk_memset32(dst, v0, count); |
| 31 | } else { |
| 32 | int pairs = count >> 1; |
| 33 | for (int i = 0; i < pairs; i++) { |
| 34 | *dst++ = v0; |
| 35 | *dst++ = v1; |
| 36 | } |
| 37 | if (count & 1) { |
| 38 | *dst = v0; |
| 39 | } |
| 40 | } |
| 41 | } |
| 42 | } |
| 43 | |
reed@google.com | 61eb040 | 2011-04-15 12:11:12 +0000 | [diff] [blame] | 44 | /////////////////////////////////////////////////////////////////////////////// |
tomhudson@google.com | 9ce767c | 2011-04-25 20:49:39 +0000 | [diff] [blame] | 45 | // Can't use a two-argument function with side effects like this in a |
| 46 | // constructor's initializer's argument list because the order of |
| 47 | // evaluations in that context is undefined (and backwards on linux/gcc). |
| 48 | static SkPoint unflatten_point(SkReader32& buffer) { |
| 49 | SkPoint retval; |
| 50 | retval.fX = buffer.readScalar(); |
| 51 | retval.fY = buffer.readScalar(); |
| 52 | return retval; |
| 53 | } |
| 54 | |
| 55 | /////////////////////////////////////////////////////////////////////////////// |
reed@android.com | 8a1c16f | 2008-12-17 15:59:43 +0000 | [diff] [blame] | 56 | |
| 57 | typedef SkFixed (*TileProc)(SkFixed); |
| 58 | |
reed@android.com | 41bccf5 | 2009-04-03 13:33:51 +0000 | [diff] [blame] | 59 | static SkFixed clamp_tileproc(SkFixed x) { |
reed@android.com | 8a1c16f | 2008-12-17 15:59:43 +0000 | [diff] [blame] | 60 | return SkClampMax(x, 0xFFFF); |
| 61 | } |
| 62 | |
reed@android.com | 41bccf5 | 2009-04-03 13:33:51 +0000 | [diff] [blame] | 63 | static SkFixed repeat_tileproc(SkFixed x) { |
reed@android.com | 8a1c16f | 2008-12-17 15:59:43 +0000 | [diff] [blame] | 64 | return x & 0xFFFF; |
| 65 | } |
| 66 | |
reed@android.com | 41bccf5 | 2009-04-03 13:33:51 +0000 | [diff] [blame] | 67 | static inline SkFixed mirror_tileproc(SkFixed x) { |
reed@android.com | 8a1c16f | 2008-12-17 15:59:43 +0000 | [diff] [blame] | 68 | int s = x << 15 >> 31; |
| 69 | return (x ^ s) & 0xFFFF; |
| 70 | } |
| 71 | |
| 72 | static const TileProc gTileProcs[] = { |
| 73 | clamp_tileproc, |
| 74 | repeat_tileproc, |
| 75 | mirror_tileproc |
| 76 | }; |
| 77 | |
reed@google.com | 61eb040 | 2011-04-15 12:11:12 +0000 | [diff] [blame] | 78 | /////////////////////////////////////////////////////////////////////////////// |
reed@android.com | 8a1c16f | 2008-12-17 15:59:43 +0000 | [diff] [blame] | 79 | |
reed@android.com | 200645d | 2009-12-14 16:41:57 +0000 | [diff] [blame] | 80 | static inline int repeat_bits(int x, const int bits) { |
| 81 | return x & ((1 << bits) - 1); |
reed@android.com | 8a1c16f | 2008-12-17 15:59:43 +0000 | [diff] [blame] | 82 | } |
| 83 | |
reed@android.com | 200645d | 2009-12-14 16:41:57 +0000 | [diff] [blame] | 84 | static inline int mirror_bits(int x, const int bits) { |
reed@android.com | 8a1c16f | 2008-12-17 15:59:43 +0000 | [diff] [blame] | 85 | #ifdef SK_CPU_HAS_CONDITIONAL_INSTR |
reed@android.com | 200645d | 2009-12-14 16:41:57 +0000 | [diff] [blame] | 86 | if (x & (1 << bits)) |
reed@android.com | 8a1c16f | 2008-12-17 15:59:43 +0000 | [diff] [blame] | 87 | x = ~x; |
reed@android.com | 200645d | 2009-12-14 16:41:57 +0000 | [diff] [blame] | 88 | return x & ((1 << bits) - 1); |
reed@android.com | 8a1c16f | 2008-12-17 15:59:43 +0000 | [diff] [blame] | 89 | #else |
reed@android.com | 200645d | 2009-12-14 16:41:57 +0000 | [diff] [blame] | 90 | int s = x << (31 - bits) >> 31; |
| 91 | return (x ^ s) & ((1 << bits) - 1); |
reed@android.com | 8a1c16f | 2008-12-17 15:59:43 +0000 | [diff] [blame] | 92 | #endif |
| 93 | } |
| 94 | |
reed@android.com | 41bccf5 | 2009-04-03 13:33:51 +0000 | [diff] [blame] | 95 | static inline int repeat_8bits(int x) { |
reed@android.com | 8a1c16f | 2008-12-17 15:59:43 +0000 | [diff] [blame] | 96 | return x & 0xFF; |
| 97 | } |
| 98 | |
reed@android.com | 41bccf5 | 2009-04-03 13:33:51 +0000 | [diff] [blame] | 99 | static inline int mirror_8bits(int x) { |
reed@android.com | 8a1c16f | 2008-12-17 15:59:43 +0000 | [diff] [blame] | 100 | #ifdef SK_CPU_HAS_CONDITIONAL_INSTR |
reed@android.com | 41bccf5 | 2009-04-03 13:33:51 +0000 | [diff] [blame] | 101 | if (x & 256) { |
reed@android.com | 8a1c16f | 2008-12-17 15:59:43 +0000 | [diff] [blame] | 102 | x = ~x; |
reed@android.com | 41bccf5 | 2009-04-03 13:33:51 +0000 | [diff] [blame] | 103 | } |
reed@android.com | 8a1c16f | 2008-12-17 15:59:43 +0000 | [diff] [blame] | 104 | return x & 255; |
| 105 | #else |
| 106 | int s = x << 23 >> 31; |
| 107 | return (x ^ s) & 0xFF; |
| 108 | #endif |
| 109 | } |
| 110 | |
reed@google.com | 61eb040 | 2011-04-15 12:11:12 +0000 | [diff] [blame] | 111 | /////////////////////////////////////////////////////////////////////////////// |
reed@android.com | 8a1c16f | 2008-12-17 15:59:43 +0000 | [diff] [blame] | 112 | |
| 113 | class Gradient_Shader : public SkShader { |
| 114 | public: |
| 115 | Gradient_Shader(const SkColor colors[], const SkScalar pos[], |
reed@android.com | 41bccf5 | 2009-04-03 13:33:51 +0000 | [diff] [blame] | 116 | int colorCount, SkShader::TileMode mode, SkUnitMapper* mapper); |
reed@android.com | 8a1c16f | 2008-12-17 15:59:43 +0000 | [diff] [blame] | 117 | virtual ~Gradient_Shader(); |
| 118 | |
| 119 | // overrides |
reed@google.com | 7716afb | 2011-12-07 15:17:50 +0000 | [diff] [blame] | 120 | virtual bool setContext(const SkBitmap&, const SkPaint&, const SkMatrix&) SK_OVERRIDE; |
| 121 | virtual uint32_t getFlags() SK_OVERRIDE { return fFlags; } |
reed@android.com | 8a1c16f | 2008-12-17 15:59:43 +0000 | [diff] [blame] | 122 | |
| 123 | protected: |
| 124 | Gradient_Shader(SkFlattenableReadBuffer& ); |
| 125 | SkUnitMapper* fMapper; |
| 126 | SkMatrix fPtsToUnit; // set by subclass |
| 127 | SkMatrix fDstToIndex; |
| 128 | SkMatrix::MapXYProc fDstToIndexProc; |
reed@android.com | 8a1c16f | 2008-12-17 15:59:43 +0000 | [diff] [blame] | 129 | TileMode fTileMode; |
| 130 | TileProc fTileProc; |
reed@android.com | 41bccf5 | 2009-04-03 13:33:51 +0000 | [diff] [blame] | 131 | int fColorCount; |
reed@android.com | 8a1c16f | 2008-12-17 15:59:43 +0000 | [diff] [blame] | 132 | uint8_t fDstToIndexClass; |
| 133 | uint8_t fFlags; |
| 134 | |
| 135 | struct Rec { |
| 136 | SkFixed fPos; // 0...1 |
| 137 | uint32_t fScale; // (1 << 24) / range |
| 138 | }; |
| 139 | Rec* fRecs; |
| 140 | |
| 141 | enum { |
reed@android.com | 512a876 | 2009-12-14 15:25:36 +0000 | [diff] [blame] | 142 | kCache16Bits = 8, // seems like enough for visual accuracy |
reed@android.com | 8a1c16f | 2008-12-17 15:59:43 +0000 | [diff] [blame] | 143 | kCache16Count = 1 << kCache16Bits, |
reed@android.com | 512a876 | 2009-12-14 15:25:36 +0000 | [diff] [blame] | 144 | kCache16Mask = kCache16Count - 1, |
| 145 | kCache16Shift = 16 - kCache16Bits, |
| 146 | |
reed@android.com | 8a1c16f | 2008-12-17 15:59:43 +0000 | [diff] [blame] | 147 | kCache32Bits = 8, // pretty much should always be 8 |
| 148 | kCache32Count = 1 << kCache32Bits |
| 149 | }; |
| 150 | virtual void flatten(SkFlattenableWriteBuffer& ); |
reed@google.com | 7c2f27d | 2011-03-07 19:29:00 +0000 | [diff] [blame] | 151 | const uint16_t* getCache16() const; |
| 152 | const SkPMColor* getCache32() const; |
reed@android.com | 8a1c16f | 2008-12-17 15:59:43 +0000 | [diff] [blame] | 153 | |
reed@google.com | 7c2f27d | 2011-03-07 19:29:00 +0000 | [diff] [blame] | 154 | void commonAsABitmap(SkBitmap*) const; |
vandebo@chromium.org | d3ae779 | 2011-02-24 00:21:06 +0000 | [diff] [blame] | 155 | void commonAsAGradient(GradientInfo*) const; |
reed@android.com | 9b46e77 | 2009-06-05 12:24:41 +0000 | [diff] [blame] | 156 | |
reed@android.com | 8a1c16f | 2008-12-17 15:59:43 +0000 | [diff] [blame] | 157 | private: |
| 158 | enum { |
| 159 | kColorStorageCount = 4, // more than this many colors, and we'll use sk_malloc for the space |
| 160 | |
reed@android.com | 1c12abe | 2009-07-02 15:01:02 +0000 | [diff] [blame] | 161 | kStorageSize = kColorStorageCount * (sizeof(SkColor) + sizeof(Rec)) |
reed@android.com | 8a1c16f | 2008-12-17 15:59:43 +0000 | [diff] [blame] | 162 | }; |
| 163 | SkColor fStorage[(kStorageSize + 3) >> 2]; |
| 164 | SkColor* fOrigColors; |
| 165 | |
reed@google.com | 7c2f27d | 2011-03-07 19:29:00 +0000 | [diff] [blame] | 166 | mutable uint16_t* fCache16; // working ptr. If this is NULL, we need to recompute the cache values |
| 167 | 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] | 168 | |
reed@google.com | 7c2f27d | 2011-03-07 19:29:00 +0000 | [diff] [blame] | 169 | mutable uint16_t* fCache16Storage; // storage for fCache16, allocated on demand |
| 170 | mutable SkMallocPixelRef* fCache32PixelRef; |
reed@google.com | 95eed98 | 2011-07-05 17:01:56 +0000 | [diff] [blame] | 171 | 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] | 172 | |
reed@android.com | 512a876 | 2009-12-14 15:25:36 +0000 | [diff] [blame] | 173 | static void Build16bitCache(uint16_t[], SkColor c0, SkColor c1, int count); |
reed@google.com | 55b8e8c | 2011-01-13 16:22:35 +0000 | [diff] [blame] | 174 | static void Build32bitCache(SkPMColor[], SkColor c0, SkColor c1, int count, |
| 175 | U8CPU alpha); |
reed@google.com | 95eed98 | 2011-07-05 17:01:56 +0000 | [diff] [blame] | 176 | void setCacheAlpha(U8CPU alpha) const; |
reed@android.com | 512a876 | 2009-12-14 15:25:36 +0000 | [diff] [blame] | 177 | |
reed@android.com | 8a1c16f | 2008-12-17 15:59:43 +0000 | [diff] [blame] | 178 | typedef SkShader INHERITED; |
| 179 | }; |
| 180 | |
reed@android.com | 41bccf5 | 2009-04-03 13:33:51 +0000 | [diff] [blame] | 181 | static inline unsigned scalarToU16(SkScalar x) { |
reed@android.com | 8a1c16f | 2008-12-17 15:59:43 +0000 | [diff] [blame] | 182 | SkASSERT(x >= 0 && x <= SK_Scalar1); |
| 183 | |
| 184 | #ifdef SK_SCALAR_IS_FLOAT |
| 185 | return (unsigned)(x * 0xFFFF); |
| 186 | #else |
| 187 | return x - (x >> 16); // probably should be x - (x > 0x7FFF) but that is slower |
| 188 | #endif |
| 189 | } |
| 190 | |
reed@android.com | 41bccf5 | 2009-04-03 13:33:51 +0000 | [diff] [blame] | 191 | Gradient_Shader::Gradient_Shader(const SkColor colors[], const SkScalar pos[], |
| 192 | int colorCount, SkShader::TileMode mode, SkUnitMapper* mapper) { |
reed@android.com | 8a1c16f | 2008-12-17 15:59:43 +0000 | [diff] [blame] | 193 | SkASSERT(colorCount > 1); |
| 194 | |
| 195 | fCacheAlpha = 256; // init to a value that paint.getAlpha() can't return |
| 196 | |
| 197 | fMapper = mapper; |
reed@google.com | 82065d6 | 2011-02-07 15:30:46 +0000 | [diff] [blame] | 198 | SkSafeRef(mapper); |
reed@android.com | 8a1c16f | 2008-12-17 15:59:43 +0000 | [diff] [blame] | 199 | |
reed@android.com | 8a1c16f | 2008-12-17 15:59:43 +0000 | [diff] [blame] | 200 | SkASSERT((unsigned)mode < SkShader::kTileModeCount); |
| 201 | SkASSERT(SkShader::kTileModeCount == SK_ARRAY_COUNT(gTileProcs)); |
| 202 | fTileMode = mode; |
| 203 | fTileProc = gTileProcs[mode]; |
reed@google.com | 55b8e8c | 2011-01-13 16:22:35 +0000 | [diff] [blame] | 204 | |
reed@android.com | 41bccf5 | 2009-04-03 13:33:51 +0000 | [diff] [blame] | 205 | fCache16 = fCache16Storage = NULL; |
reed@google.com | dc731fd | 2010-12-23 15:19:47 +0000 | [diff] [blame] | 206 | fCache32 = NULL; |
| 207 | fCache32PixelRef = NULL; |
reed@android.com | 8a1c16f | 2008-12-17 15:59:43 +0000 | [diff] [blame] | 208 | |
reed@android.com | 41bccf5 | 2009-04-03 13:33:51 +0000 | [diff] [blame] | 209 | /* Note: we let the caller skip the first and/or last position. |
| 210 | i.e. pos[0] = 0.3, pos[1] = 0.7 |
| 211 | In these cases, we insert dummy entries to ensure that the final data |
| 212 | will be bracketed by [0, 1]. |
| 213 | i.e. our_pos[0] = 0, our_pos[1] = 0.3, our_pos[2] = 0.7, our_pos[3] = 1 |
| 214 | |
| 215 | Thus colorCount (the caller's value, and fColorCount (our value) may |
| 216 | differ by up to 2. In the above example: |
| 217 | colorCount = 2 |
| 218 | fColorCount = 4 |
| 219 | */ |
| 220 | fColorCount = colorCount; |
| 221 | // check if we need to add in dummy start and/or end position/colors |
| 222 | bool dummyFirst = false; |
| 223 | bool dummyLast = false; |
| 224 | if (pos) { |
| 225 | dummyFirst = pos[0] != 0; |
| 226 | dummyLast = pos[colorCount - 1] != SK_Scalar1; |
| 227 | fColorCount += dummyFirst + dummyLast; |
| 228 | } |
| 229 | |
| 230 | if (fColorCount > kColorStorageCount) { |
reed@android.com | 1c12abe | 2009-07-02 15:01:02 +0000 | [diff] [blame] | 231 | size_t size = sizeof(SkColor) + sizeof(Rec); |
reed@android.com | 41bccf5 | 2009-04-03 13:33:51 +0000 | [diff] [blame] | 232 | fOrigColors = reinterpret_cast<SkColor*>( |
| 233 | sk_malloc_throw(size * fColorCount)); |
| 234 | } |
| 235 | else { |
| 236 | fOrigColors = fStorage; |
| 237 | } |
| 238 | |
| 239 | // Now copy over the colors, adding the dummies as needed |
reed@android.com | 8a1c16f | 2008-12-17 15:59:43 +0000 | [diff] [blame] | 240 | { |
reed@android.com | 41bccf5 | 2009-04-03 13:33:51 +0000 | [diff] [blame] | 241 | SkColor* origColors = fOrigColors; |
| 242 | if (dummyFirst) { |
| 243 | *origColors++ = colors[0]; |
| 244 | } |
| 245 | memcpy(origColors, colors, colorCount * sizeof(SkColor)); |
| 246 | if (dummyLast) { |
| 247 | origColors += colorCount; |
| 248 | *origColors = colors[colorCount - 1]; |
| 249 | } |
| 250 | } |
reed@android.com | 8a1c16f | 2008-12-17 15:59:43 +0000 | [diff] [blame] | 251 | |
reed@android.com | 1c12abe | 2009-07-02 15:01:02 +0000 | [diff] [blame] | 252 | fRecs = (Rec*)(fOrigColors + fColorCount); |
reed@android.com | 41bccf5 | 2009-04-03 13:33:51 +0000 | [diff] [blame] | 253 | if (fColorCount > 2) { |
| 254 | Rec* recs = fRecs; |
| 255 | recs->fPos = 0; |
| 256 | // recs->fScale = 0; // unused; |
| 257 | recs += 1; |
| 258 | if (pos) { |
reed@android.com | 8a1c16f | 2008-12-17 15:59:43 +0000 | [diff] [blame] | 259 | /* We need to convert the user's array of relative positions into |
| 260 | fixed-point positions and scale factors. We need these results |
| 261 | to be strictly monotonic (no two values equal or out of order). |
| 262 | Hence this complex loop that just jams a zero for the scale |
| 263 | value if it sees a segment out of order, and it assures that |
| 264 | we start at 0 and end at 1.0 |
| 265 | */ |
| 266 | SkFixed prev = 0; |
reed@android.com | 41bccf5 | 2009-04-03 13:33:51 +0000 | [diff] [blame] | 267 | int startIndex = dummyFirst ? 0 : 1; |
| 268 | int count = colorCount + dummyLast; |
| 269 | for (int i = startIndex; i < count; i++) { |
reed@android.com | 8a1c16f | 2008-12-17 15:59:43 +0000 | [diff] [blame] | 270 | // force the last value to be 1.0 |
| 271 | SkFixed curr; |
reed@android.com | 41bccf5 | 2009-04-03 13:33:51 +0000 | [diff] [blame] | 272 | if (i == colorCount) { // we're really at the dummyLast |
reed@android.com | 8a1c16f | 2008-12-17 15:59:43 +0000 | [diff] [blame] | 273 | curr = SK_Fixed1; |
reed@android.com | 41bccf5 | 2009-04-03 13:33:51 +0000 | [diff] [blame] | 274 | } else { |
reed@android.com | 8a1c16f | 2008-12-17 15:59:43 +0000 | [diff] [blame] | 275 | curr = SkScalarToFixed(pos[i]); |
reed@android.com | 8a1c16f | 2008-12-17 15:59:43 +0000 | [diff] [blame] | 276 | } |
reed@android.com | 41bccf5 | 2009-04-03 13:33:51 +0000 | [diff] [blame] | 277 | // pin curr withing range |
| 278 | if (curr < 0) { |
| 279 | curr = 0; |
| 280 | } else if (curr > SK_Fixed1) { |
| 281 | curr = SK_Fixed1; |
| 282 | } |
| 283 | recs->fPos = curr; |
| 284 | if (curr > prev) { |
| 285 | recs->fScale = (1 << 24) / (curr - prev); |
| 286 | } else { |
| 287 | recs->fScale = 0; // ignore this segment |
| 288 | } |
reed@android.com | 8a1c16f | 2008-12-17 15:59:43 +0000 | [diff] [blame] | 289 | // get ready for the next value |
| 290 | prev = curr; |
reed@android.com | 41bccf5 | 2009-04-03 13:33:51 +0000 | [diff] [blame] | 291 | recs += 1; |
reed@android.com | 8a1c16f | 2008-12-17 15:59:43 +0000 | [diff] [blame] | 292 | } |
reed@android.com | 41bccf5 | 2009-04-03 13:33:51 +0000 | [diff] [blame] | 293 | } else { // assume even distribution |
reed@android.com | 8a1c16f | 2008-12-17 15:59:43 +0000 | [diff] [blame] | 294 | SkFixed dp = SK_Fixed1 / (colorCount - 1); |
| 295 | SkFixed p = dp; |
| 296 | SkFixed scale = (colorCount - 1) << 8; // (1 << 24) / dp |
reed@android.com | 41bccf5 | 2009-04-03 13:33:51 +0000 | [diff] [blame] | 297 | for (int i = 1; i < colorCount; i++) { |
| 298 | recs->fPos = p; |
| 299 | recs->fScale = scale; |
| 300 | recs += 1; |
reed@android.com | 8a1c16f | 2008-12-17 15:59:43 +0000 | [diff] [blame] | 301 | p += dp; |
| 302 | } |
| 303 | } |
| 304 | } |
reed@android.com | 4a7fd2b | 2009-06-02 19:46:20 +0000 | [diff] [blame] | 305 | fFlags = 0; |
reed@android.com | 8a1c16f | 2008-12-17 15:59:43 +0000 | [diff] [blame] | 306 | } |
| 307 | |
| 308 | Gradient_Shader::Gradient_Shader(SkFlattenableReadBuffer& buffer) : |
reed@android.com | 41bccf5 | 2009-04-03 13:33:51 +0000 | [diff] [blame] | 309 | INHERITED(buffer) { |
reed@android.com | 8a1c16f | 2008-12-17 15:59:43 +0000 | [diff] [blame] | 310 | fCacheAlpha = 256; |
| 311 | |
| 312 | fMapper = static_cast<SkUnitMapper*>(buffer.readFlattenable()); |
| 313 | |
| 314 | fCache16 = fCache16Storage = NULL; |
reed@google.com | dc731fd | 2010-12-23 15:19:47 +0000 | [diff] [blame] | 315 | fCache32 = NULL; |
| 316 | fCache32PixelRef = NULL; |
reed@android.com | 8a1c16f | 2008-12-17 15:59:43 +0000 | [diff] [blame] | 317 | |
reed@android.com | 41bccf5 | 2009-04-03 13:33:51 +0000 | [diff] [blame] | 318 | int colorCount = fColorCount = buffer.readU32(); |
| 319 | if (colorCount > kColorStorageCount) { |
| 320 | size_t size = sizeof(SkColor) + sizeof(SkPMColor) + sizeof(Rec); |
| 321 | fOrigColors = (SkColor*)sk_malloc_throw(size * colorCount); |
| 322 | } else { |
reed@android.com | 8a1c16f | 2008-12-17 15:59:43 +0000 | [diff] [blame] | 323 | fOrigColors = fStorage; |
reed@android.com | 41bccf5 | 2009-04-03 13:33:51 +0000 | [diff] [blame] | 324 | } |
reed@android.com | 8a1c16f | 2008-12-17 15:59:43 +0000 | [diff] [blame] | 325 | buffer.read(fOrigColors, colorCount * sizeof(SkColor)); |
reed@android.com | 8a1c16f | 2008-12-17 15:59:43 +0000 | [diff] [blame] | 326 | |
| 327 | fTileMode = (TileMode)buffer.readU8(); |
| 328 | fTileProc = gTileProcs[fTileMode]; |
reed@android.com | 1c12abe | 2009-07-02 15:01:02 +0000 | [diff] [blame] | 329 | fRecs = (Rec*)(fOrigColors + colorCount); |
reed@android.com | 8a1c16f | 2008-12-17 15:59:43 +0000 | [diff] [blame] | 330 | if (colorCount > 2) { |
| 331 | Rec* recs = fRecs; |
| 332 | recs[0].fPos = 0; |
| 333 | for (int i = 1; i < colorCount; i++) { |
| 334 | recs[i].fPos = buffer.readS32(); |
| 335 | recs[i].fScale = buffer.readU32(); |
| 336 | } |
| 337 | } |
reed@google.com | f2eb5ab | 2011-05-10 22:56:42 +0000 | [diff] [blame] | 338 | SkReadMatrix(&buffer, &fPtsToUnit); |
reed@android.com | 4a7fd2b | 2009-06-02 19:46:20 +0000 | [diff] [blame] | 339 | fFlags = 0; |
reed@android.com | 8a1c16f | 2008-12-17 15:59:43 +0000 | [diff] [blame] | 340 | } |
| 341 | |
reed@android.com | 41bccf5 | 2009-04-03 13:33:51 +0000 | [diff] [blame] | 342 | Gradient_Shader::~Gradient_Shader() { |
| 343 | if (fCache16Storage) { |
reed@android.com | 8a1c16f | 2008-12-17 15:59:43 +0000 | [diff] [blame] | 344 | sk_free(fCache16Storage); |
reed@android.com | 41bccf5 | 2009-04-03 13:33:51 +0000 | [diff] [blame] | 345 | } |
reed@google.com | dc731fd | 2010-12-23 15:19:47 +0000 | [diff] [blame] | 346 | SkSafeUnref(fCache32PixelRef); |
reed@android.com | 41bccf5 | 2009-04-03 13:33:51 +0000 | [diff] [blame] | 347 | if (fOrigColors != fStorage) { |
reed@android.com | 8a1c16f | 2008-12-17 15:59:43 +0000 | [diff] [blame] | 348 | sk_free(fOrigColors); |
reed@android.com | 41bccf5 | 2009-04-03 13:33:51 +0000 | [diff] [blame] | 349 | } |
reed@google.com | 82065d6 | 2011-02-07 15:30:46 +0000 | [diff] [blame] | 350 | SkSafeUnref(fMapper); |
reed@android.com | 8a1c16f | 2008-12-17 15:59:43 +0000 | [diff] [blame] | 351 | } |
| 352 | |
reed@android.com | 41bccf5 | 2009-04-03 13:33:51 +0000 | [diff] [blame] | 353 | void Gradient_Shader::flatten(SkFlattenableWriteBuffer& buffer) { |
reed@android.com | 8a1c16f | 2008-12-17 15:59:43 +0000 | [diff] [blame] | 354 | this->INHERITED::flatten(buffer); |
| 355 | buffer.writeFlattenable(fMapper); |
reed@android.com | 41bccf5 | 2009-04-03 13:33:51 +0000 | [diff] [blame] | 356 | buffer.write32(fColorCount); |
reed@android.com | 8a1c16f | 2008-12-17 15:59:43 +0000 | [diff] [blame] | 357 | buffer.writeMul4(fOrigColors, fColorCount * sizeof(SkColor)); |
| 358 | buffer.write8(fTileMode); |
| 359 | if (fColorCount > 2) { |
| 360 | Rec* recs = fRecs; |
| 361 | for (int i = 1; i < fColorCount; i++) { |
| 362 | buffer.write32(recs[i].fPos); |
| 363 | buffer.write32(recs[i].fScale); |
| 364 | } |
| 365 | } |
reed@google.com | f2eb5ab | 2011-05-10 22:56:42 +0000 | [diff] [blame] | 366 | SkWriteMatrix(&buffer, fPtsToUnit); |
reed@android.com | 8a1c16f | 2008-12-17 15:59:43 +0000 | [diff] [blame] | 367 | } |
| 368 | |
| 369 | bool Gradient_Shader::setContext(const SkBitmap& device, |
| 370 | const SkPaint& paint, |
reed@android.com | 41bccf5 | 2009-04-03 13:33:51 +0000 | [diff] [blame] | 371 | const SkMatrix& matrix) { |
| 372 | if (!this->INHERITED::setContext(device, paint, matrix)) { |
reed@android.com | 8a1c16f | 2008-12-17 15:59:43 +0000 | [diff] [blame] | 373 | return false; |
reed@android.com | 41bccf5 | 2009-04-03 13:33:51 +0000 | [diff] [blame] | 374 | } |
reed@android.com | 8a1c16f | 2008-12-17 15:59:43 +0000 | [diff] [blame] | 375 | |
| 376 | const SkMatrix& inverse = this->getTotalInverse(); |
| 377 | |
| 378 | if (!fDstToIndex.setConcat(fPtsToUnit, inverse)) { |
| 379 | return false; |
| 380 | } |
| 381 | |
| 382 | fDstToIndexProc = fDstToIndex.getMapXYProc(); |
| 383 | fDstToIndexClass = (uint8_t)SkShader::ComputeMatrixClass(fDstToIndex); |
| 384 | |
| 385 | // now convert our colors in to PMColors |
| 386 | unsigned paintAlpha = this->getPaintAlpha(); |
| 387 | unsigned colorAlpha = 0xFF; |
| 388 | |
reed@android.com | 3d06a8c | 2009-07-07 18:19:59 +0000 | [diff] [blame] | 389 | // FIXME: record colorAlpha in constructor, since this is not affected |
| 390 | // by setContext() |
reed@android.com | 41bccf5 | 2009-04-03 13:33:51 +0000 | [diff] [blame] | 391 | for (int i = 0; i < fColorCount; i++) { |
reed@android.com | 8a1c16f | 2008-12-17 15:59:43 +0000 | [diff] [blame] | 392 | SkColor src = fOrigColors[i]; |
| 393 | unsigned sa = SkColorGetA(src); |
| 394 | colorAlpha &= sa; |
reed@android.com | 8a1c16f | 2008-12-17 15:59:43 +0000 | [diff] [blame] | 395 | } |
| 396 | |
| 397 | fFlags = this->INHERITED::getFlags(); |
| 398 | if ((colorAlpha & paintAlpha) == 0xFF) { |
| 399 | fFlags |= kOpaqueAlpha_Flag; |
| 400 | } |
| 401 | // we can do span16 as long as our individual colors are opaque, |
| 402 | // regardless of the paint's alpha |
| 403 | if (0xFF == colorAlpha) { |
| 404 | fFlags |= kHasSpan16_Flag; |
| 405 | } |
| 406 | |
reed@google.com | 95eed98 | 2011-07-05 17:01:56 +0000 | [diff] [blame] | 407 | this->setCacheAlpha(paintAlpha); |
| 408 | return true; |
| 409 | } |
| 410 | |
| 411 | void Gradient_Shader::setCacheAlpha(U8CPU alpha) const { |
reed@android.com | 8a1c16f | 2008-12-17 15:59:43 +0000 | [diff] [blame] | 412 | // if the new alpha differs from the previous time we were called, inval our cache |
| 413 | // this will trigger the cache to be rebuilt. |
| 414 | // 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] | 415 | if (fCacheAlpha != alpha) { |
| 416 | fCache16 = NULL; // inval the cache |
| 417 | fCache32 = NULL; // inval the cache |
| 418 | fCacheAlpha = alpha; // record the new alpha |
reed@android.com | 9b46e77 | 2009-06-05 12:24:41 +0000 | [diff] [blame] | 419 | // inform our subclasses |
reed@google.com | dc731fd | 2010-12-23 15:19:47 +0000 | [diff] [blame] | 420 | if (fCache32PixelRef) { |
| 421 | fCache32PixelRef->notifyPixelsChanged(); |
| 422 | } |
reed@android.com | 8a1c16f | 2008-12-17 15:59:43 +0000 | [diff] [blame] | 423 | } |
reed@android.com | 8a1c16f | 2008-12-17 15:59:43 +0000 | [diff] [blame] | 424 | } |
| 425 | |
reed@android.com | 41bccf5 | 2009-04-03 13:33:51 +0000 | [diff] [blame] | 426 | static inline int blend8(int a, int b, int scale) { |
reed@android.com | 8a1c16f | 2008-12-17 15:59:43 +0000 | [diff] [blame] | 427 | SkASSERT(a == SkToU8(a)); |
| 428 | SkASSERT(b == SkToU8(b)); |
| 429 | SkASSERT(scale >= 0 && scale <= 256); |
reed@android.com | 8a1c16f | 2008-12-17 15:59:43 +0000 | [diff] [blame] | 430 | return a + ((b - a) * scale >> 8); |
| 431 | } |
| 432 | |
reed@android.com | 41bccf5 | 2009-04-03 13:33:51 +0000 | [diff] [blame] | 433 | static inline uint32_t dot8_blend_packed32(uint32_t s0, uint32_t s1, |
| 434 | int blend) { |
reed@android.com | 8a1c16f | 2008-12-17 15:59:43 +0000 | [diff] [blame] | 435 | #if 0 |
| 436 | int a = blend8(SkGetPackedA32(s0), SkGetPackedA32(s1), blend); |
| 437 | int r = blend8(SkGetPackedR32(s0), SkGetPackedR32(s1), blend); |
| 438 | int g = blend8(SkGetPackedG32(s0), SkGetPackedG32(s1), blend); |
| 439 | int b = blend8(SkGetPackedB32(s0), SkGetPackedB32(s1), blend); |
| 440 | |
| 441 | return SkPackARGB32(a, r, g, b); |
| 442 | #else |
| 443 | int otherBlend = 256 - blend; |
| 444 | |
| 445 | #if 0 |
| 446 | U32 t0 = (((s0 & 0xFF00FF) * blend + (s1 & 0xFF00FF) * otherBlend) >> 8) & 0xFF00FF; |
| 447 | U32 t1 = (((s0 >> 8) & 0xFF00FF) * blend + ((s1 >> 8) & 0xFF00FF) * otherBlend) & 0xFF00FF00; |
| 448 | SkASSERT((t0 & t1) == 0); |
| 449 | return t0 | t1; |
| 450 | #else |
| 451 | return ((((s0 & 0xFF00FF) * blend + (s1 & 0xFF00FF) * otherBlend) >> 8) & 0xFF00FF) | |
| 452 | ((((s0 >> 8) & 0xFF00FF) * blend + ((s1 >> 8) & 0xFF00FF) * otherBlend) & 0xFF00FF00); |
| 453 | #endif |
| 454 | |
| 455 | #endif |
| 456 | } |
| 457 | |
| 458 | #define Fixed_To_Dot8(x) (((x) + 0x80) >> 8) |
| 459 | |
reed@android.com | 41bccf5 | 2009-04-03 13:33:51 +0000 | [diff] [blame] | 460 | /** We take the original colors, not our premultiplied PMColors, since we can |
| 461 | build a 16bit table as long as the original colors are opaque, even if the |
| 462 | paint specifies a non-opaque alpha. |
reed@android.com | 8a1c16f | 2008-12-17 15:59:43 +0000 | [diff] [blame] | 463 | */ |
reed@android.com | 512a876 | 2009-12-14 15:25:36 +0000 | [diff] [blame] | 464 | void Gradient_Shader::Build16bitCache(uint16_t cache[], SkColor c0, SkColor c1, |
| 465 | int count) { |
reed@android.com | 8a1c16f | 2008-12-17 15:59:43 +0000 | [diff] [blame] | 466 | SkASSERT(count > 1); |
| 467 | SkASSERT(SkColorGetA(c0) == 0xFF); |
| 468 | SkASSERT(SkColorGetA(c1) == 0xFF); |
| 469 | |
| 470 | SkFixed r = SkColorGetR(c0); |
| 471 | SkFixed g = SkColorGetG(c0); |
| 472 | SkFixed b = SkColorGetB(c0); |
| 473 | |
| 474 | SkFixed dr = SkIntToFixed(SkColorGetR(c1) - r) / (count - 1); |
| 475 | SkFixed dg = SkIntToFixed(SkColorGetG(c1) - g) / (count - 1); |
| 476 | SkFixed db = SkIntToFixed(SkColorGetB(c1) - b) / (count - 1); |
| 477 | |
| 478 | r = SkIntToFixed(r) + 0x8000; |
| 479 | g = SkIntToFixed(g) + 0x8000; |
| 480 | b = SkIntToFixed(b) + 0x8000; |
| 481 | |
| 482 | do { |
| 483 | unsigned rr = r >> 16; |
| 484 | unsigned gg = g >> 16; |
| 485 | unsigned bb = b >> 16; |
| 486 | cache[0] = SkPackRGB16(SkR32ToR16(rr), SkG32ToG16(gg), SkB32ToB16(bb)); |
reed@android.com | 512a876 | 2009-12-14 15:25:36 +0000 | [diff] [blame] | 487 | cache[kCache16Count] = SkDitherPack888ToRGB16(rr, gg, bb); |
reed@android.com | 8a1c16f | 2008-12-17 15:59:43 +0000 | [diff] [blame] | 488 | cache += 1; |
| 489 | r += dr; |
| 490 | g += dg; |
| 491 | b += db; |
| 492 | } while (--count != 0); |
| 493 | } |
| 494 | |
reed@google.com | 55b8e8c | 2011-01-13 16:22:35 +0000 | [diff] [blame] | 495 | /* |
| 496 | * 2x2 dither a fixed-point color component (8.16) down to 8, matching the |
| 497 | * semantics of how we 2x2 dither 32->16 |
| 498 | */ |
| 499 | static inline U8CPU dither_fixed_to_8(SkFixed n) { |
| 500 | n >>= 8; |
| 501 | return ((n << 1) - ((n >> 8 << 8) | (n >> 8))) >> 8; |
| 502 | } |
| 503 | |
| 504 | /* |
| 505 | * For dithering with premultiply, we want to ceiling the alpha component, |
| 506 | * to ensure that it is always >= any color component. |
| 507 | */ |
| 508 | static inline U8CPU dither_ceil_fixed_to_8(SkFixed n) { |
| 509 | n >>= 8; |
| 510 | return ((n << 1) - (n | (n >> 8))) >> 8; |
| 511 | } |
| 512 | |
| 513 | void Gradient_Shader::Build32bitCache(SkPMColor cache[], SkColor c0, SkColor c1, |
| 514 | int count, U8CPU paintAlpha) { |
reed@android.com | 8a1c16f | 2008-12-17 15:59:43 +0000 | [diff] [blame] | 515 | SkASSERT(count > 1); |
| 516 | |
reed@android.com | 1c12abe | 2009-07-02 15:01:02 +0000 | [diff] [blame] | 517 | // need to apply paintAlpha to our two endpoints |
| 518 | SkFixed a = SkMulDiv255Round(SkColorGetA(c0), paintAlpha); |
| 519 | SkFixed da; |
| 520 | { |
| 521 | int tmp = SkMulDiv255Round(SkColorGetA(c1), paintAlpha); |
| 522 | da = SkIntToFixed(tmp - a) / (count - 1); |
| 523 | } |
reed@android.com | 8a1c16f | 2008-12-17 15:59:43 +0000 | [diff] [blame] | 524 | |
reed@android.com | 1c12abe | 2009-07-02 15:01:02 +0000 | [diff] [blame] | 525 | SkFixed r = SkColorGetR(c0); |
| 526 | SkFixed g = SkColorGetG(c0); |
| 527 | SkFixed b = SkColorGetB(c0); |
| 528 | SkFixed dr = SkIntToFixed(SkColorGetR(c1) - r) / (count - 1); |
| 529 | SkFixed dg = SkIntToFixed(SkColorGetG(c1) - g) / (count - 1); |
| 530 | SkFixed db = SkIntToFixed(SkColorGetB(c1) - b) / (count - 1); |
reed@android.com | 8a1c16f | 2008-12-17 15:59:43 +0000 | [diff] [blame] | 531 | |
| 532 | a = SkIntToFixed(a) + 0x8000; |
| 533 | r = SkIntToFixed(r) + 0x8000; |
| 534 | g = SkIntToFixed(g) + 0x8000; |
| 535 | b = SkIntToFixed(b) + 0x8000; |
| 536 | |
| 537 | do { |
reed@google.com | 0b8b3bb | 2011-06-30 21:06:22 +0000 | [diff] [blame] | 538 | cache[0] = SkPremultiplyARGBInline(a >> 16, r >> 16, g >> 16, b >> 16); |
| 539 | cache[kCache32Count] = SkPremultiplyARGBInline(dither_ceil_fixed_to_8(a), |
| 540 | dither_fixed_to_8(r), |
| 541 | dither_fixed_to_8(g), |
| 542 | dither_fixed_to_8(b)); |
reed@google.com | 55b8e8c | 2011-01-13 16:22:35 +0000 | [diff] [blame] | 543 | cache += 1; |
reed@android.com | 8a1c16f | 2008-12-17 15:59:43 +0000 | [diff] [blame] | 544 | a += da; |
| 545 | r += dr; |
| 546 | g += dg; |
| 547 | b += db; |
| 548 | } while (--count != 0); |
| 549 | } |
| 550 | |
reed@android.com | 41bccf5 | 2009-04-03 13:33:51 +0000 | [diff] [blame] | 551 | static inline int SkFixedToFFFF(SkFixed x) { |
reed@android.com | 8a1c16f | 2008-12-17 15:59:43 +0000 | [diff] [blame] | 552 | SkASSERT((unsigned)x <= SK_Fixed1); |
| 553 | return x - (x >> 16); |
| 554 | } |
| 555 | |
reed@android.com | 200645d | 2009-12-14 16:41:57 +0000 | [diff] [blame] | 556 | static inline U16CPU bitsTo16(unsigned x, const unsigned bits) { |
reed@android.com | e191b16 | 2009-12-18 21:33:39 +0000 | [diff] [blame] | 557 | SkASSERT(x < (1U << bits)); |
reed@android.com | 200645d | 2009-12-14 16:41:57 +0000 | [diff] [blame] | 558 | if (6 == bits) { |
| 559 | return (x << 10) | (x << 4) | (x >> 2); |
| 560 | } |
| 561 | if (8 == bits) { |
| 562 | return (x << 8) | x; |
| 563 | } |
| 564 | sk_throw(); |
| 565 | return 0; |
reed@android.com | 8a1c16f | 2008-12-17 15:59:43 +0000 | [diff] [blame] | 566 | } |
| 567 | |
reed@google.com | 7c2f27d | 2011-03-07 19:29:00 +0000 | [diff] [blame] | 568 | const uint16_t* Gradient_Shader::getCache16() const { |
reed@android.com | 41bccf5 | 2009-04-03 13:33:51 +0000 | [diff] [blame] | 569 | if (fCache16 == NULL) { |
reed@google.com | 55b8e8c | 2011-01-13 16:22:35 +0000 | [diff] [blame] | 570 | // double the count for dither entries |
| 571 | const int entryCount = kCache16Count * 2; |
| 572 | const size_t allocSize = sizeof(uint16_t) * entryCount; |
| 573 | |
reed@android.com | 3c9b2a4 | 2009-08-27 19:28:37 +0000 | [diff] [blame] | 574 | if (fCache16Storage == NULL) { // set the storage and our working ptr |
reed@google.com | 55b8e8c | 2011-01-13 16:22:35 +0000 | [diff] [blame] | 575 | fCache16Storage = (uint16_t*)sk_malloc_throw(allocSize); |
reed@android.com | 3c9b2a4 | 2009-08-27 19:28:37 +0000 | [diff] [blame] | 576 | } |
reed@android.com | 8a1c16f | 2008-12-17 15:59:43 +0000 | [diff] [blame] | 577 | fCache16 = fCache16Storage; |
reed@android.com | 41bccf5 | 2009-04-03 13:33:51 +0000 | [diff] [blame] | 578 | if (fColorCount == 2) { |
reed@android.com | 512a876 | 2009-12-14 15:25:36 +0000 | [diff] [blame] | 579 | Build16bitCache(fCache16, fOrigColors[0], fOrigColors[1], kCache16Count); |
reed@android.com | 41bccf5 | 2009-04-03 13:33:51 +0000 | [diff] [blame] | 580 | } else { |
reed@android.com | 8a1c16f | 2008-12-17 15:59:43 +0000 | [diff] [blame] | 581 | Rec* rec = fRecs; |
| 582 | int prevIndex = 0; |
reed@android.com | 41bccf5 | 2009-04-03 13:33:51 +0000 | [diff] [blame] | 583 | for (int i = 1; i < fColorCount; i++) { |
reed@android.com | 512a876 | 2009-12-14 15:25:36 +0000 | [diff] [blame] | 584 | int nextIndex = SkFixedToFFFF(rec[i].fPos) >> kCache16Shift; |
reed@android.com | 8a1c16f | 2008-12-17 15:59:43 +0000 | [diff] [blame] | 585 | SkASSERT(nextIndex < kCache16Count); |
| 586 | |
| 587 | if (nextIndex > prevIndex) |
reed@android.com | 512a876 | 2009-12-14 15:25:36 +0000 | [diff] [blame] | 588 | Build16bitCache(fCache16 + prevIndex, fOrigColors[i-1], fOrigColors[i], nextIndex - prevIndex + 1); |
reed@android.com | 8a1c16f | 2008-12-17 15:59:43 +0000 | [diff] [blame] | 589 | prevIndex = nextIndex; |
| 590 | } |
| 591 | SkASSERT(prevIndex == kCache16Count - 1); |
| 592 | } |
| 593 | |
reed@android.com | 41bccf5 | 2009-04-03 13:33:51 +0000 | [diff] [blame] | 594 | if (fMapper) { |
reed@google.com | 55b8e8c | 2011-01-13 16:22:35 +0000 | [diff] [blame] | 595 | fCache16Storage = (uint16_t*)sk_malloc_throw(allocSize); |
reed@android.com | 8a1c16f | 2008-12-17 15:59:43 +0000 | [diff] [blame] | 596 | uint16_t* linear = fCache16; // just computed linear data |
| 597 | uint16_t* mapped = fCache16Storage; // storage for mapped data |
| 598 | SkUnitMapper* map = fMapper; |
reed@android.com | 200645d | 2009-12-14 16:41:57 +0000 | [diff] [blame] | 599 | for (int i = 0; i < kCache16Count; i++) { |
| 600 | int index = map->mapUnit16(bitsTo16(i, kCache16Bits)) >> kCache16Shift; |
reed@android.com | 8a1c16f | 2008-12-17 15:59:43 +0000 | [diff] [blame] | 601 | mapped[i] = linear[index]; |
reed@android.com | 200645d | 2009-12-14 16:41:57 +0000 | [diff] [blame] | 602 | mapped[i + kCache16Count] = linear[index + kCache16Count]; |
reed@android.com | 8a1c16f | 2008-12-17 15:59:43 +0000 | [diff] [blame] | 603 | } |
| 604 | sk_free(fCache16); |
| 605 | fCache16 = fCache16Storage; |
| 606 | } |
| 607 | } |
| 608 | return fCache16; |
| 609 | } |
| 610 | |
reed@google.com | 7c2f27d | 2011-03-07 19:29:00 +0000 | [diff] [blame] | 611 | const SkPMColor* Gradient_Shader::getCache32() const { |
reed@android.com | 41bccf5 | 2009-04-03 13:33:51 +0000 | [diff] [blame] | 612 | if (fCache32 == NULL) { |
reed@google.com | 55b8e8c | 2011-01-13 16:22:35 +0000 | [diff] [blame] | 613 | // double the count for dither entries |
| 614 | const int entryCount = kCache32Count * 2; |
| 615 | const size_t allocSize = sizeof(SkPMColor) * entryCount; |
| 616 | |
reed@google.com | dc731fd | 2010-12-23 15:19:47 +0000 | [diff] [blame] | 617 | if (NULL == fCache32PixelRef) { |
reed@google.com | 55b8e8c | 2011-01-13 16:22:35 +0000 | [diff] [blame] | 618 | fCache32PixelRef = SkNEW_ARGS(SkMallocPixelRef, |
| 619 | (NULL, allocSize, NULL)); |
reed@google.com | dc731fd | 2010-12-23 15:19:47 +0000 | [diff] [blame] | 620 | } |
| 621 | fCache32 = (SkPMColor*)fCache32PixelRef->getAddr(); |
reed@android.com | 41bccf5 | 2009-04-03 13:33:51 +0000 | [diff] [blame] | 622 | if (fColorCount == 2) { |
reed@google.com | 55b8e8c | 2011-01-13 16:22:35 +0000 | [diff] [blame] | 623 | Build32bitCache(fCache32, fOrigColors[0], fOrigColors[1], |
| 624 | kCache32Count, fCacheAlpha); |
reed@android.com | 41bccf5 | 2009-04-03 13:33:51 +0000 | [diff] [blame] | 625 | } else { |
reed@android.com | 8a1c16f | 2008-12-17 15:59:43 +0000 | [diff] [blame] | 626 | Rec* rec = fRecs; |
| 627 | int prevIndex = 0; |
reed@android.com | 41bccf5 | 2009-04-03 13:33:51 +0000 | [diff] [blame] | 628 | for (int i = 1; i < fColorCount; i++) { |
reed@android.com | 8a1c16f | 2008-12-17 15:59:43 +0000 | [diff] [blame] | 629 | int nextIndex = SkFixedToFFFF(rec[i].fPos) >> (16 - kCache32Bits); |
| 630 | SkASSERT(nextIndex < kCache32Count); |
| 631 | |
| 632 | if (nextIndex > prevIndex) |
reed@google.com | 55b8e8c | 2011-01-13 16:22:35 +0000 | [diff] [blame] | 633 | Build32bitCache(fCache32 + prevIndex, fOrigColors[i-1], |
| 634 | fOrigColors[i], |
| 635 | nextIndex - prevIndex + 1, fCacheAlpha); |
reed@android.com | 8a1c16f | 2008-12-17 15:59:43 +0000 | [diff] [blame] | 636 | prevIndex = nextIndex; |
| 637 | } |
| 638 | SkASSERT(prevIndex == kCache32Count - 1); |
| 639 | } |
| 640 | |
reed@android.com | 41bccf5 | 2009-04-03 13:33:51 +0000 | [diff] [blame] | 641 | if (fMapper) { |
reed@google.com | dc731fd | 2010-12-23 15:19:47 +0000 | [diff] [blame] | 642 | SkMallocPixelRef* newPR = SkNEW_ARGS(SkMallocPixelRef, |
reed@google.com | 55b8e8c | 2011-01-13 16:22:35 +0000 | [diff] [blame] | 643 | (NULL, allocSize, NULL)); |
reed@android.com | 8a1c16f | 2008-12-17 15:59:43 +0000 | [diff] [blame] | 644 | SkPMColor* linear = fCache32; // just computed linear data |
reed@google.com | dc731fd | 2010-12-23 15:19:47 +0000 | [diff] [blame] | 645 | SkPMColor* mapped = (SkPMColor*)newPR->getAddr(); // storage for mapped data |
reed@android.com | 8a1c16f | 2008-12-17 15:59:43 +0000 | [diff] [blame] | 646 | SkUnitMapper* map = fMapper; |
reed@google.com | 55b8e8c | 2011-01-13 16:22:35 +0000 | [diff] [blame] | 647 | for (int i = 0; i < kCache32Count; i++) { |
| 648 | int index = map->mapUnit16((i << 8) | i) >> 8; |
| 649 | mapped[i] = linear[index]; |
| 650 | mapped[i + kCache32Count] = linear[index + kCache32Count]; |
reed@android.com | 41bccf5 | 2009-04-03 13:33:51 +0000 | [diff] [blame] | 651 | } |
reed@google.com | dc731fd | 2010-12-23 15:19:47 +0000 | [diff] [blame] | 652 | fCache32PixelRef->unref(); |
| 653 | fCache32PixelRef = newPR; |
| 654 | fCache32 = (SkPMColor*)newPR->getAddr(); |
reed@android.com | 8a1c16f | 2008-12-17 15:59:43 +0000 | [diff] [blame] | 655 | } |
| 656 | } |
| 657 | return fCache32; |
| 658 | } |
| 659 | |
reed@google.com | dc731fd | 2010-12-23 15:19:47 +0000 | [diff] [blame] | 660 | /* |
| 661 | * Because our caller might rebuild the same (logically the same) gradient |
| 662 | * over and over, we'd like to return exactly the same "bitmap" if possible, |
| 663 | * allowing the client to utilize a cache of our bitmap (e.g. with a GPU). |
| 664 | * To do that, we maintain a private cache of built-bitmaps, based on our |
| 665 | * colors and positions. Note: we don't try to flatten the fMapper, so if one |
| 666 | * is present, we skip the cache for now. |
| 667 | */ |
reed@google.com | 7c2f27d | 2011-03-07 19:29:00 +0000 | [diff] [blame] | 668 | void Gradient_Shader::commonAsABitmap(SkBitmap* bitmap) const { |
reed@google.com | 95eed98 | 2011-07-05 17:01:56 +0000 | [diff] [blame] | 669 | // our caller assumes no external alpha, so we ensure that our cache is |
| 670 | // built with 0xFF |
| 671 | this->setCacheAlpha(0xFF); |
| 672 | |
reed@google.com | dc731fd | 2010-12-23 15:19:47 +0000 | [diff] [blame] | 673 | // don't have a way to put the mapper into our cache-key yet |
| 674 | if (fMapper) { |
| 675 | // force our cahce32pixelref to be built |
| 676 | (void)this->getCache32(); |
| 677 | bitmap->setConfig(SkBitmap::kARGB_8888_Config, kCache32Count, 1); |
| 678 | bitmap->setPixelRef(fCache32PixelRef); |
| 679 | return; |
| 680 | } |
| 681 | |
| 682 | // build our key: [numColors + colors[] + {positions[]} ] |
| 683 | int count = 1 + fColorCount; |
| 684 | if (fColorCount > 2) { |
| 685 | count += fColorCount - 1; // fRecs[].fPos |
| 686 | } |
| 687 | |
| 688 | SkAutoSTMalloc<16, int32_t> storage(count); |
| 689 | int32_t* buffer = storage.get(); |
| 690 | |
| 691 | *buffer++ = fColorCount; |
| 692 | memcpy(buffer, fOrigColors, fColorCount * sizeof(SkColor)); |
| 693 | buffer += fColorCount; |
| 694 | if (fColorCount > 2) { |
| 695 | for (int i = 1; i < fColorCount; i++) { |
| 696 | *buffer++ = fRecs[i].fPos; |
| 697 | } |
| 698 | } |
| 699 | SkASSERT(buffer - storage.get() == count); |
| 700 | |
| 701 | /////////////////////////////////// |
| 702 | |
| 703 | static SkMutex gMutex; |
| 704 | static SkBitmapCache* gCache; |
| 705 | // each cache cost 1K of RAM, since each bitmap will be 1x256 at 32bpp |
| 706 | static const int MAX_NUM_CACHED_GRADIENT_BITMAPS = 32; |
| 707 | SkAutoMutexAcquire ama(gMutex); |
reed@google.com | 55b8e8c | 2011-01-13 16:22:35 +0000 | [diff] [blame] | 708 | |
reed@google.com | dc731fd | 2010-12-23 15:19:47 +0000 | [diff] [blame] | 709 | if (NULL == gCache) { |
| 710 | gCache = new SkBitmapCache(MAX_NUM_CACHED_GRADIENT_BITMAPS); |
| 711 | } |
| 712 | size_t size = count * sizeof(int32_t); |
| 713 | |
| 714 | if (!gCache->find(storage.get(), size, bitmap)) { |
| 715 | // force our cahce32pixelref to be built |
| 716 | (void)this->getCache32(); |
| 717 | bitmap->setConfig(SkBitmap::kARGB_8888_Config, kCache32Count, 1); |
| 718 | bitmap->setPixelRef(fCache32PixelRef); |
| 719 | |
| 720 | gCache->add(storage.get(), size, *bitmap); |
| 721 | } |
| 722 | } |
| 723 | |
vandebo@chromium.org | d3ae779 | 2011-02-24 00:21:06 +0000 | [diff] [blame] | 724 | void Gradient_Shader::commonAsAGradient(GradientInfo* info) const { |
| 725 | if (info) { |
| 726 | if (info->fColorCount >= fColorCount) { |
| 727 | if (info->fColors) { |
| 728 | memcpy(info->fColors, fOrigColors, |
| 729 | fColorCount * sizeof(SkColor)); |
| 730 | } |
| 731 | if (info->fColorOffsets) { |
| 732 | if (fColorCount == 2) { |
| 733 | info->fColorOffsets[0] = 0; |
| 734 | info->fColorOffsets[1] = SK_Scalar1; |
| 735 | } else if (fColorCount > 2) { |
| 736 | for (int i = 0; i < fColorCount; i++) |
| 737 | info->fColorOffsets[i] = SkFixedToScalar(fRecs[i].fPos); |
| 738 | } |
| 739 | } |
| 740 | } |
| 741 | info->fColorCount = fColorCount; |
| 742 | info->fTileMode = fTileMode; |
| 743 | } |
| 744 | } |
| 745 | |
reed@google.com | 61eb040 | 2011-04-15 12:11:12 +0000 | [diff] [blame] | 746 | /////////////////////////////////////////////////////////////////////////////// |
reed@android.com | 8a1c16f | 2008-12-17 15:59:43 +0000 | [diff] [blame] | 747 | |
reed@android.com | 41bccf5 | 2009-04-03 13:33:51 +0000 | [diff] [blame] | 748 | 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] | 749 | SkVector vec = pts[1] - pts[0]; |
| 750 | SkScalar mag = vec.length(); |
| 751 | SkScalar inv = mag ? SkScalarInvert(mag) : 0; |
| 752 | |
| 753 | vec.scale(inv); |
| 754 | matrix->setSinCos(-vec.fY, vec.fX, pts[0].fX, pts[0].fY); |
| 755 | matrix->postTranslate(-pts[0].fX, -pts[0].fY); |
| 756 | matrix->postScale(inv, inv); |
| 757 | } |
| 758 | |
| 759 | /////////////////////////////////////////////////////////////////////////////// |
| 760 | |
| 761 | class Linear_Gradient : public Gradient_Shader { |
| 762 | public: |
| 763 | Linear_Gradient(const SkPoint pts[2], |
| 764 | const SkColor colors[], const SkScalar pos[], int colorCount, |
| 765 | SkShader::TileMode mode, SkUnitMapper* mapper) |
vandebo@chromium.org | d3ae779 | 2011-02-24 00:21:06 +0000 | [diff] [blame] | 766 | : Gradient_Shader(colors, pos, colorCount, mode, mapper), |
| 767 | fStart(pts[0]), |
| 768 | fEnd(pts[1]) |
reed@android.com | 8a1c16f | 2008-12-17 15:59:43 +0000 | [diff] [blame] | 769 | { |
| 770 | pts_to_unit_matrix(pts, &fPtsToUnit); |
| 771 | } |
reed@android.com | 9b46e77 | 2009-06-05 12:24:41 +0000 | [diff] [blame] | 772 | |
reed@google.com | 7716afb | 2011-12-07 15:17:50 +0000 | [diff] [blame] | 773 | virtual bool setContext(const SkBitmap&, const SkPaint&, const SkMatrix&) SK_OVERRIDE; |
| 774 | virtual void shadeSpan(int x, int y, SkPMColor dstC[], int count) SK_OVERRIDE; |
| 775 | virtual void shadeSpan16(int x, int y, uint16_t dstC[], int count) SK_OVERRIDE; |
| 776 | virtual BitmapType asABitmap(SkBitmap*, SkMatrix*, TileMode*, |
| 777 | SkScalar* twoPointRadialParams) const SK_OVERRIDE; |
| 778 | virtual GradientType asAGradient(GradientInfo* info) const SK_OVERRIDE; |
reed@android.com | 8a1c16f | 2008-12-17 15:59:43 +0000 | [diff] [blame] | 779 | |
reed@google.com | 55b8e8c | 2011-01-13 16:22:35 +0000 | [diff] [blame] | 780 | static SkFlattenable* CreateProc(SkFlattenableReadBuffer& buffer) { |
reed@android.com | 8a1c16f | 2008-12-17 15:59:43 +0000 | [diff] [blame] | 781 | return SkNEW_ARGS(Linear_Gradient, (buffer)); |
| 782 | } |
| 783 | |
reed@google.com | 7716afb | 2011-12-07 15:17:50 +0000 | [diff] [blame] | 784 | virtual void flatten(SkFlattenableWriteBuffer& buffer) SK_OVERRIDE { |
vandebo@chromium.org | d3ae779 | 2011-02-24 00:21:06 +0000 | [diff] [blame] | 785 | this->INHERITED::flatten(buffer); |
| 786 | buffer.writeScalar(fStart.fX); |
| 787 | buffer.writeScalar(fStart.fY); |
| 788 | buffer.writeScalar(fEnd.fX); |
| 789 | buffer.writeScalar(fEnd.fY); |
| 790 | } |
| 791 | |
reed@android.com | 8a1c16f | 2008-12-17 15:59:43 +0000 | [diff] [blame] | 792 | protected: |
vandebo@chromium.org | d3ae779 | 2011-02-24 00:21:06 +0000 | [diff] [blame] | 793 | Linear_Gradient(SkFlattenableReadBuffer& buffer) |
| 794 | : Gradient_Shader(buffer), |
tomhudson@google.com | 9ce767c | 2011-04-25 20:49:39 +0000 | [diff] [blame] | 795 | fStart(unflatten_point(buffer)), |
| 796 | fEnd(unflatten_point(buffer)) { |
vandebo@chromium.org | d3ae779 | 2011-02-24 00:21:06 +0000 | [diff] [blame] | 797 | } |
reed@google.com | 7716afb | 2011-12-07 15:17:50 +0000 | [diff] [blame] | 798 | virtual Factory getFactory() SK_OVERRIDE { return CreateProc; } |
reed@android.com | 8a1c16f | 2008-12-17 15:59:43 +0000 | [diff] [blame] | 799 | |
| 800 | private: |
| 801 | typedef Gradient_Shader INHERITED; |
vandebo@chromium.org | d3ae779 | 2011-02-24 00:21:06 +0000 | [diff] [blame] | 802 | const SkPoint fStart; |
| 803 | const SkPoint fEnd; |
reed@android.com | 8a1c16f | 2008-12-17 15:59:43 +0000 | [diff] [blame] | 804 | }; |
| 805 | |
reed@android.com | 5119bdb | 2009-06-12 21:27:03 +0000 | [diff] [blame] | 806 | bool Linear_Gradient::setContext(const SkBitmap& device, const SkPaint& paint, |
| 807 | const SkMatrix& matrix) { |
| 808 | if (!this->INHERITED::setContext(device, paint, matrix)) { |
| 809 | return false; |
| 810 | } |
| 811 | |
| 812 | unsigned mask = SkMatrix::kTranslate_Mask | SkMatrix::kScale_Mask; |
| 813 | if ((fDstToIndex.getType() & ~mask) == 0) { |
reed@android.com | 3c9b2a4 | 2009-08-27 19:28:37 +0000 | [diff] [blame] | 814 | fFlags |= SkShader::kConstInY32_Flag; |
| 815 | if ((fFlags & SkShader::kHasSpan16_Flag) && !paint.isDither()) { |
| 816 | // only claim this if we do have a 16bit mode (i.e. none of our |
| 817 | // colors have alpha), and if we are not dithering (which obviously |
| 818 | // is not const in Y). |
| 819 | fFlags |= SkShader::kConstInY16_Flag; |
| 820 | } |
reed@android.com | 5119bdb | 2009-06-12 21:27:03 +0000 | [diff] [blame] | 821 | } |
| 822 | return true; |
| 823 | } |
| 824 | |
reed@android.com | 8a1c16f | 2008-12-17 15:59:43 +0000 | [diff] [blame] | 825 | // 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] | 826 | 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] | 827 | SkASSERT(count > 0); |
| 828 | return (unsigned)((fx | (fx + (count - 1) * dx)) >> 8) <= 0xFF; |
| 829 | } |
| 830 | |
reed@google.com | 5eb158d | 2011-04-15 15:50:34 +0000 | [diff] [blame] | 831 | #include "SkClampRange.h" |
| 832 | |
| 833 | #define NO_CHECK_ITER \ |
reed@google.com | 13659f1 | 2011-04-18 19:59:38 +0000 | [diff] [blame] | 834 | do { \ |
| 835 | unsigned fi = fx >> 8; \ |
reed@google.com | 5eb158d | 2011-04-15 15:50:34 +0000 | [diff] [blame] | 836 | SkASSERT(fi <= 0xFF); \ |
| 837 | fx += dx; \ |
| 838 | *dstC++ = cache[toggle + fi]; \ |
reed@google.com | 13659f1 | 2011-04-18 19:59:38 +0000 | [diff] [blame] | 839 | toggle ^= TOGGLE_MASK; \ |
| 840 | } while (0) |
reed@google.com | 5eb158d | 2011-04-15 15:50:34 +0000 | [diff] [blame] | 841 | |
| 842 | |
reed@google.com | dd5bd67 | 2011-09-20 15:56:13 +0000 | [diff] [blame] | 843 | 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] | 844 | SkASSERT(count > 0); |
| 845 | |
| 846 | SkPoint srcPt; |
| 847 | SkMatrix::MapXYProc dstProc = fDstToIndexProc; |
| 848 | TileProc proc = fTileProc; |
reed@google.com | dd5bd67 | 2011-09-20 15:56:13 +0000 | [diff] [blame] | 849 | const SkPMColor* SK_RESTRICT cache = this->getCache32(); |
reed@google.com | 0e734bd | 2011-12-08 17:24:44 +0000 | [diff] [blame^] | 850 | #ifdef USE_DITHER_32BIT_GRADIENT |
reed@google.com | 55b8e8c | 2011-01-13 16:22:35 +0000 | [diff] [blame] | 851 | int toggle = ((x ^ y) & 1) << kCache32Bits; |
| 852 | const int TOGGLE_MASK = (1 << kCache32Bits); |
reed@google.com | 0e734bd | 2011-12-08 17:24:44 +0000 | [diff] [blame^] | 853 | #else |
| 854 | int toggle = 0; |
| 855 | const int TOGGLE_MASK = 0; |
| 856 | #endif |
reed@android.com | 8a1c16f | 2008-12-17 15:59:43 +0000 | [diff] [blame] | 857 | |
reed@android.com | c552a43 | 2009-06-12 20:02:50 +0000 | [diff] [blame] | 858 | if (fDstToIndexClass != kPerspective_MatrixClass) { |
reed@google.com | dc731fd | 2010-12-23 15:19:47 +0000 | [diff] [blame] | 859 | dstProc(fDstToIndex, SkIntToScalar(x) + SK_ScalarHalf, |
| 860 | SkIntToScalar(y) + SK_ScalarHalf, &srcPt); |
reed@android.com | 8a1c16f | 2008-12-17 15:59:43 +0000 | [diff] [blame] | 861 | SkFixed dx, fx = SkScalarToFixed(srcPt.fX); |
| 862 | |
reed@android.com | c552a43 | 2009-06-12 20:02:50 +0000 | [diff] [blame] | 863 | if (fDstToIndexClass == kFixedStepInX_MatrixClass) { |
reed@android.com | 8a1c16f | 2008-12-17 15:59:43 +0000 | [diff] [blame] | 864 | SkFixed dxStorage[1]; |
| 865 | (void)fDstToIndex.fixedStepInX(SkIntToScalar(y), dxStorage, NULL); |
| 866 | dx = dxStorage[0]; |
reed@android.com | c552a43 | 2009-06-12 20:02:50 +0000 | [diff] [blame] | 867 | } else { |
reed@android.com | 8a1c16f | 2008-12-17 15:59:43 +0000 | [diff] [blame] | 868 | SkASSERT(fDstToIndexClass == kLinear_MatrixClass); |
| 869 | dx = SkScalarToFixed(fDstToIndex.getScaleX()); |
| 870 | } |
| 871 | |
reed@android.com | c552a43 | 2009-06-12 20:02:50 +0000 | [diff] [blame] | 872 | if (SkFixedNearlyZero(dx)) { |
| 873 | // we're a vertical gradient, so no change in a span |
reed@android.com | 8a1c16f | 2008-12-17 15:59:43 +0000 | [diff] [blame] | 874 | unsigned fi = proc(fx); |
| 875 | SkASSERT(fi <= 0xFFFF); |
reed@google.com | 55b8e8c | 2011-01-13 16:22:35 +0000 | [diff] [blame] | 876 | // TODO: dither version |
reed@android.com | 8a1c16f | 2008-12-17 15:59:43 +0000 | [diff] [blame] | 877 | sk_memset32(dstC, cache[fi >> (16 - kCache32Bits)], count); |
reed@android.com | c552a43 | 2009-06-12 20:02:50 +0000 | [diff] [blame] | 878 | } else if (proc == clamp_tileproc) { |
reed@google.com | 5eb158d | 2011-04-15 15:50:34 +0000 | [diff] [blame] | 879 | SkClampRange range; |
| 880 | range.init(fx, dx, count, 0, 0xFF); |
| 881 | |
| 882 | if ((count = range.fCount0) > 0) { |
| 883 | sk_memset32_dither(dstC, |
| 884 | cache[toggle + range.fV0], |
| 885 | cache[(toggle ^ TOGGLE_MASK) + range.fV0], |
| 886 | count); |
| 887 | dstC += count; |
| 888 | } |
| 889 | if ((count = range.fCount1) > 0) { |
reed@google.com | 13659f1 | 2011-04-18 19:59:38 +0000 | [diff] [blame] | 890 | int unroll = count >> 3; |
| 891 | fx = range.fFx1; |
| 892 | for (int i = 0; i < unroll; i++) { |
reed@google.com | 5eb158d | 2011-04-15 15:50:34 +0000 | [diff] [blame] | 893 | NO_CHECK_ITER; NO_CHECK_ITER; |
| 894 | NO_CHECK_ITER; NO_CHECK_ITER; |
| 895 | NO_CHECK_ITER; NO_CHECK_ITER; |
| 896 | NO_CHECK_ITER; NO_CHECK_ITER; |
| 897 | } |
| 898 | if ((count &= 7) > 0) { |
| 899 | do { |
| 900 | NO_CHECK_ITER; |
| 901 | } while (--count != 0); |
| 902 | } |
| 903 | } |
| 904 | if ((count = range.fCount2) > 0) { |
| 905 | sk_memset32_dither(dstC, |
| 906 | cache[toggle + range.fV1], |
| 907 | cache[(toggle ^ TOGGLE_MASK) + range.fV1], |
| 908 | count); |
| 909 | } |
reed@android.com | c552a43 | 2009-06-12 20:02:50 +0000 | [diff] [blame] | 910 | } else if (proc == mirror_tileproc) { |
reed@android.com | 8a1c16f | 2008-12-17 15:59:43 +0000 | [diff] [blame] | 911 | do { |
| 912 | unsigned fi = mirror_8bits(fx >> 8); |
| 913 | SkASSERT(fi <= 0xFF); |
| 914 | fx += dx; |
reed@google.com | 55b8e8c | 2011-01-13 16:22:35 +0000 | [diff] [blame] | 915 | *dstC++ = cache[toggle + fi]; |
| 916 | toggle ^= TOGGLE_MASK; |
reed@android.com | 8a1c16f | 2008-12-17 15:59:43 +0000 | [diff] [blame] | 917 | } while (--count != 0); |
reed@android.com | c552a43 | 2009-06-12 20:02:50 +0000 | [diff] [blame] | 918 | } else { |
reed@android.com | 8a1c16f | 2008-12-17 15:59:43 +0000 | [diff] [blame] | 919 | SkASSERT(proc == repeat_tileproc); |
| 920 | do { |
| 921 | unsigned fi = repeat_8bits(fx >> 8); |
| 922 | SkASSERT(fi <= 0xFF); |
| 923 | fx += dx; |
reed@google.com | 55b8e8c | 2011-01-13 16:22:35 +0000 | [diff] [blame] | 924 | *dstC++ = cache[toggle + fi]; |
| 925 | toggle ^= TOGGLE_MASK; |
reed@android.com | 8a1c16f | 2008-12-17 15:59:43 +0000 | [diff] [blame] | 926 | } while (--count != 0); |
| 927 | } |
reed@android.com | c552a43 | 2009-06-12 20:02:50 +0000 | [diff] [blame] | 928 | } else { |
reed@android.com | 8a1c16f | 2008-12-17 15:59:43 +0000 | [diff] [blame] | 929 | SkScalar dstX = SkIntToScalar(x); |
| 930 | SkScalar dstY = SkIntToScalar(y); |
| 931 | do { |
| 932 | dstProc(fDstToIndex, dstX, dstY, &srcPt); |
| 933 | unsigned fi = proc(SkScalarToFixed(srcPt.fX)); |
| 934 | SkASSERT(fi <= 0xFFFF); |
reed@google.com | 55b8e8c | 2011-01-13 16:22:35 +0000 | [diff] [blame] | 935 | *dstC++ = cache[toggle + (fi >> (16 - kCache32Bits))]; |
| 936 | toggle ^= TOGGLE_MASK; |
reed@android.com | 8a1c16f | 2008-12-17 15:59:43 +0000 | [diff] [blame] | 937 | dstX += SK_Scalar1; |
| 938 | } while (--count != 0); |
| 939 | } |
| 940 | } |
| 941 | |
reed@google.com | 55b8e8c | 2011-01-13 16:22:35 +0000 | [diff] [blame] | 942 | SkShader::BitmapType Linear_Gradient::asABitmap(SkBitmap* bitmap, |
reed@google.com | dc731fd | 2010-12-23 15:19:47 +0000 | [diff] [blame] | 943 | SkMatrix* matrix, |
| 944 | TileMode xy[], |
reed@google.com | 7c2f27d | 2011-03-07 19:29:00 +0000 | [diff] [blame] | 945 | SkScalar* twoPointRadialParams) const { |
reed@android.com | 8a1c16f | 2008-12-17 15:59:43 +0000 | [diff] [blame] | 946 | if (bitmap) { |
reed@google.com | dc731fd | 2010-12-23 15:19:47 +0000 | [diff] [blame] | 947 | this->commonAsABitmap(bitmap); |
reed@android.com | 8a1c16f | 2008-12-17 15:59:43 +0000 | [diff] [blame] | 948 | } |
| 949 | if (matrix) { |
| 950 | matrix->setScale(SkIntToScalar(kCache32Count), SK_Scalar1); |
| 951 | matrix->preConcat(fPtsToUnit); |
| 952 | } |
| 953 | if (xy) { |
| 954 | xy[0] = fTileMode; |
| 955 | xy[1] = kClamp_TileMode; |
| 956 | } |
reed@google.com | dc731fd | 2010-12-23 15:19:47 +0000 | [diff] [blame] | 957 | return kDefault_BitmapType; |
reed@android.com | 8a1c16f | 2008-12-17 15:59:43 +0000 | [diff] [blame] | 958 | } |
| 959 | |
vandebo@chromium.org | d3ae779 | 2011-02-24 00:21:06 +0000 | [diff] [blame] | 960 | SkShader::GradientType Linear_Gradient::asAGradient(GradientInfo* info) const { |
| 961 | if (info) { |
| 962 | commonAsAGradient(info); |
| 963 | info->fPoint[0] = fStart; |
| 964 | info->fPoint[1] = fEnd; |
| 965 | } |
| 966 | return kLinear_GradientType; |
| 967 | } |
| 968 | |
reed@android.com | 3c9b2a4 | 2009-08-27 19:28:37 +0000 | [diff] [blame] | 969 | static void dither_memset16(uint16_t dst[], uint16_t value, uint16_t other, |
| 970 | int count) { |
| 971 | if (reinterpret_cast<uintptr_t>(dst) & 2) { |
reed@android.com | 8a1c16f | 2008-12-17 15:59:43 +0000 | [diff] [blame] | 972 | *dst++ = value; |
| 973 | count -= 1; |
| 974 | SkTSwap(value, other); |
| 975 | } |
| 976 | |
| 977 | sk_memset32((uint32_t*)dst, (value << 16) | other, count >> 1); |
reed@google.com | 55b8e8c | 2011-01-13 16:22:35 +0000 | [diff] [blame] | 978 | |
reed@android.com | 3c9b2a4 | 2009-08-27 19:28:37 +0000 | [diff] [blame] | 979 | if (count & 1) { |
reed@android.com | 8a1c16f | 2008-12-17 15:59:43 +0000 | [diff] [blame] | 980 | dst[count - 1] = value; |
reed@android.com | 3c9b2a4 | 2009-08-27 19:28:37 +0000 | [diff] [blame] | 981 | } |
reed@android.com | 8a1c16f | 2008-12-17 15:59:43 +0000 | [diff] [blame] | 982 | } |
reed@android.com | 8a1c16f | 2008-12-17 15:59:43 +0000 | [diff] [blame] | 983 | |
reed@google.com | 5eb158d | 2011-04-15 15:50:34 +0000 | [diff] [blame] | 984 | #define NO_CHECK_ITER_16 \ |
reed@google.com | 13659f1 | 2011-04-18 19:59:38 +0000 | [diff] [blame] | 985 | do { \ |
| 986 | unsigned fi = fx >> kCache16Shift; \ |
reed@google.com | 5eb158d | 2011-04-15 15:50:34 +0000 | [diff] [blame] | 987 | SkASSERT(fi <= kCache16Mask); \ |
| 988 | fx += dx; \ |
| 989 | *dstC++ = cache[toggle + fi]; \ |
reed@google.com | 13659f1 | 2011-04-18 19:59:38 +0000 | [diff] [blame] | 990 | toggle ^= TOGGLE_MASK; \ |
| 991 | } while (0) |
reed@google.com | 5eb158d | 2011-04-15 15:50:34 +0000 | [diff] [blame] | 992 | |
| 993 | |
reed@google.com | dd5bd67 | 2011-09-20 15:56:13 +0000 | [diff] [blame] | 994 | 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] | 995 | SkASSERT(count > 0); |
| 996 | |
| 997 | SkPoint srcPt; |
| 998 | SkMatrix::MapXYProc dstProc = fDstToIndexProc; |
| 999 | TileProc proc = fTileProc; |
reed@google.com | dd5bd67 | 2011-09-20 15:56:13 +0000 | [diff] [blame] | 1000 | const uint16_t* SK_RESTRICT cache = this->getCache16(); |
reed@android.com | 8a1c16f | 2008-12-17 15:59:43 +0000 | [diff] [blame] | 1001 | int toggle = ((x ^ y) & 1) << kCache16Bits; |
reed@google.com | 5eb158d | 2011-04-15 15:50:34 +0000 | [diff] [blame] | 1002 | const int TOGGLE_MASK = (1 << kCache32Bits); |
reed@android.com | 8a1c16f | 2008-12-17 15:59:43 +0000 | [diff] [blame] | 1003 | |
reed@android.com | b2c5f2d | 2009-06-12 20:09:24 +0000 | [diff] [blame] | 1004 | if (fDstToIndexClass != kPerspective_MatrixClass) { |
reed@google.com | dc731fd | 2010-12-23 15:19:47 +0000 | [diff] [blame] | 1005 | dstProc(fDstToIndex, SkIntToScalar(x) + SK_ScalarHalf, |
| 1006 | SkIntToScalar(y) + SK_ScalarHalf, &srcPt); |
reed@android.com | 8a1c16f | 2008-12-17 15:59:43 +0000 | [diff] [blame] | 1007 | SkFixed dx, fx = SkScalarToFixed(srcPt.fX); |
| 1008 | |
reed@android.com | b2c5f2d | 2009-06-12 20:09:24 +0000 | [diff] [blame] | 1009 | if (fDstToIndexClass == kFixedStepInX_MatrixClass) { |
reed@android.com | 8a1c16f | 2008-12-17 15:59:43 +0000 | [diff] [blame] | 1010 | SkFixed dxStorage[1]; |
| 1011 | (void)fDstToIndex.fixedStepInX(SkIntToScalar(y), dxStorage, NULL); |
| 1012 | dx = dxStorage[0]; |
reed@android.com | b2c5f2d | 2009-06-12 20:09:24 +0000 | [diff] [blame] | 1013 | } else { |
reed@android.com | 8a1c16f | 2008-12-17 15:59:43 +0000 | [diff] [blame] | 1014 | SkASSERT(fDstToIndexClass == kLinear_MatrixClass); |
| 1015 | dx = SkScalarToFixed(fDstToIndex.getScaleX()); |
| 1016 | } |
| 1017 | |
reed@android.com | b2c5f2d | 2009-06-12 20:09:24 +0000 | [diff] [blame] | 1018 | if (SkFixedNearlyZero(dx)) { |
| 1019 | // we're a vertical gradient, so no change in a span |
reed@android.com | 512a876 | 2009-12-14 15:25:36 +0000 | [diff] [blame] | 1020 | unsigned fi = proc(fx) >> kCache16Shift; |
| 1021 | SkASSERT(fi <= kCache16Mask); |
reed@google.com | 5eb158d | 2011-04-15 15:50:34 +0000 | [diff] [blame] | 1022 | dither_memset16(dstC, cache[toggle + fi], |
| 1023 | cache[(toggle ^ TOGGLE_MASK) + fi], count); |
reed@android.com | b2c5f2d | 2009-06-12 20:09:24 +0000 | [diff] [blame] | 1024 | } else if (proc == clamp_tileproc) { |
reed@google.com | 5eb158d | 2011-04-15 15:50:34 +0000 | [diff] [blame] | 1025 | SkClampRange range; |
| 1026 | range.init(fx, dx, count, 0, kCache16Mask); |
| 1027 | |
| 1028 | if ((count = range.fCount0) > 0) { |
| 1029 | dither_memset16(dstC, |
| 1030 | cache[toggle + range.fV0], |
| 1031 | cache[(toggle ^ TOGGLE_MASK) + range.fV0], |
| 1032 | count); |
| 1033 | dstC += count; |
| 1034 | } |
| 1035 | if ((count = range.fCount1) > 0) { |
reed@google.com | 13659f1 | 2011-04-18 19:59:38 +0000 | [diff] [blame] | 1036 | int unroll = count >> 3; |
| 1037 | fx = range.fFx1; |
| 1038 | for (int i = 0; i < unroll; i++) { |
reed@google.com | 5eb158d | 2011-04-15 15:50:34 +0000 | [diff] [blame] | 1039 | NO_CHECK_ITER_16; NO_CHECK_ITER_16; |
| 1040 | NO_CHECK_ITER_16; NO_CHECK_ITER_16; |
| 1041 | NO_CHECK_ITER_16; NO_CHECK_ITER_16; |
| 1042 | NO_CHECK_ITER_16; NO_CHECK_ITER_16; |
| 1043 | } |
| 1044 | if ((count &= 7) > 0) { |
| 1045 | do { |
| 1046 | NO_CHECK_ITER_16; |
| 1047 | } while (--count != 0); |
| 1048 | } |
| 1049 | } |
| 1050 | if ((count = range.fCount2) > 0) { |
| 1051 | dither_memset16(dstC, |
| 1052 | cache[toggle + range.fV1], |
| 1053 | cache[(toggle ^ TOGGLE_MASK) + range.fV1], |
| 1054 | count); |
| 1055 | } |
reed@android.com | b2c5f2d | 2009-06-12 20:09:24 +0000 | [diff] [blame] | 1056 | } else if (proc == mirror_tileproc) { |
reed@android.com | 8a1c16f | 2008-12-17 15:59:43 +0000 | [diff] [blame] | 1057 | do { |
reed@android.com | 200645d | 2009-12-14 16:41:57 +0000 | [diff] [blame] | 1058 | unsigned fi = mirror_bits(fx >> kCache16Shift, kCache16Bits); |
reed@android.com | 512a876 | 2009-12-14 15:25:36 +0000 | [diff] [blame] | 1059 | SkASSERT(fi <= kCache16Mask); |
reed@android.com | 8a1c16f | 2008-12-17 15:59:43 +0000 | [diff] [blame] | 1060 | fx += dx; |
reed@android.com | 8a1c16f | 2008-12-17 15:59:43 +0000 | [diff] [blame] | 1061 | *dstC++ = cache[toggle + fi]; |
reed@google.com | 5eb158d | 2011-04-15 15:50:34 +0000 | [diff] [blame] | 1062 | toggle ^= TOGGLE_MASK; |
reed@android.com | 8a1c16f | 2008-12-17 15:59:43 +0000 | [diff] [blame] | 1063 | } while (--count != 0); |
reed@android.com | b2c5f2d | 2009-06-12 20:09:24 +0000 | [diff] [blame] | 1064 | } else { |
reed@android.com | 8a1c16f | 2008-12-17 15:59:43 +0000 | [diff] [blame] | 1065 | SkASSERT(proc == repeat_tileproc); |
| 1066 | do { |
reed@android.com | 200645d | 2009-12-14 16:41:57 +0000 | [diff] [blame] | 1067 | unsigned fi = repeat_bits(fx >> kCache16Shift, kCache16Bits); |
reed@android.com | 512a876 | 2009-12-14 15:25:36 +0000 | [diff] [blame] | 1068 | SkASSERT(fi <= kCache16Mask); |
reed@android.com | 8a1c16f | 2008-12-17 15:59:43 +0000 | [diff] [blame] | 1069 | fx += dx; |
reed@android.com | 8a1c16f | 2008-12-17 15:59:43 +0000 | [diff] [blame] | 1070 | *dstC++ = cache[toggle + fi]; |
reed@google.com | 5eb158d | 2011-04-15 15:50:34 +0000 | [diff] [blame] | 1071 | toggle ^= TOGGLE_MASK; |
reed@android.com | 8a1c16f | 2008-12-17 15:59:43 +0000 | [diff] [blame] | 1072 | } while (--count != 0); |
| 1073 | } |
reed@android.com | b2c5f2d | 2009-06-12 20:09:24 +0000 | [diff] [blame] | 1074 | } else { |
reed@android.com | 8a1c16f | 2008-12-17 15:59:43 +0000 | [diff] [blame] | 1075 | SkScalar dstX = SkIntToScalar(x); |
| 1076 | SkScalar dstY = SkIntToScalar(y); |
| 1077 | do { |
| 1078 | dstProc(fDstToIndex, dstX, dstY, &srcPt); |
| 1079 | unsigned fi = proc(SkScalarToFixed(srcPt.fX)); |
| 1080 | SkASSERT(fi <= 0xFFFF); |
| 1081 | |
reed@android.com | 512a876 | 2009-12-14 15:25:36 +0000 | [diff] [blame] | 1082 | int index = fi >> kCache16Shift; |
reed@android.com | 8a1c16f | 2008-12-17 15:59:43 +0000 | [diff] [blame] | 1083 | *dstC++ = cache[toggle + index]; |
reed@google.com | 5eb158d | 2011-04-15 15:50:34 +0000 | [diff] [blame] | 1084 | toggle ^= TOGGLE_MASK; |
reed@android.com | 8a1c16f | 2008-12-17 15:59:43 +0000 | [diff] [blame] | 1085 | |
| 1086 | dstX += SK_Scalar1; |
| 1087 | } while (--count != 0); |
| 1088 | } |
| 1089 | } |
| 1090 | |
| 1091 | /////////////////////////////////////////////////////////////////////////////// |
| 1092 | |
| 1093 | #define kSQRT_TABLE_BITS 11 |
| 1094 | #define kSQRT_TABLE_SIZE (1 << kSQRT_TABLE_BITS) |
| 1095 | |
| 1096 | #include "SkRadialGradient_Table.h" |
| 1097 | |
| 1098 | #if defined(SK_BUILD_FOR_WIN32) && defined(SK_DEBUG) |
| 1099 | |
| 1100 | #include <stdio.h> |
| 1101 | |
reed@google.com | 61eb040 | 2011-04-15 12:11:12 +0000 | [diff] [blame] | 1102 | void SkRadialGradient_BuildTable() { |
reed@android.com | 8a1c16f | 2008-12-17 15:59:43 +0000 | [diff] [blame] | 1103 | // build it 0..127 x 0..127, so we use 2^15 - 1 in the numerator for our "fixed" table |
| 1104 | |
| 1105 | FILE* file = ::fopen("SkRadialGradient_Table.h", "w"); |
| 1106 | SkASSERT(file); |
| 1107 | ::fprintf(file, "static const uint8_t gSqrt8Table[] = {\n"); |
| 1108 | |
reed@google.com | 61eb040 | 2011-04-15 12:11:12 +0000 | [diff] [blame] | 1109 | for (int i = 0; i < kSQRT_TABLE_SIZE; i++) { |
| 1110 | if ((i & 15) == 0) { |
reed@android.com | 8a1c16f | 2008-12-17 15:59:43 +0000 | [diff] [blame] | 1111 | ::fprintf(file, "\t"); |
reed@google.com | 61eb040 | 2011-04-15 12:11:12 +0000 | [diff] [blame] | 1112 | } |
reed@android.com | 8a1c16f | 2008-12-17 15:59:43 +0000 | [diff] [blame] | 1113 | |
| 1114 | uint8_t value = SkToU8(SkFixedSqrt(i * SK_Fixed1 / kSQRT_TABLE_SIZE) >> 8); |
| 1115 | |
| 1116 | ::fprintf(file, "0x%02X", value); |
reed@google.com | 61eb040 | 2011-04-15 12:11:12 +0000 | [diff] [blame] | 1117 | if (i < kSQRT_TABLE_SIZE-1) { |
reed@android.com | 8a1c16f | 2008-12-17 15:59:43 +0000 | [diff] [blame] | 1118 | ::fprintf(file, ", "); |
reed@google.com | 61eb040 | 2011-04-15 12:11:12 +0000 | [diff] [blame] | 1119 | } |
| 1120 | if ((i & 15) == 15) { |
reed@android.com | 8a1c16f | 2008-12-17 15:59:43 +0000 | [diff] [blame] | 1121 | ::fprintf(file, "\n"); |
reed@google.com | 61eb040 | 2011-04-15 12:11:12 +0000 | [diff] [blame] | 1122 | } |
reed@android.com | 8a1c16f | 2008-12-17 15:59:43 +0000 | [diff] [blame] | 1123 | } |
| 1124 | ::fprintf(file, "};\n"); |
| 1125 | ::fclose(file); |
| 1126 | } |
| 1127 | |
| 1128 | #endif |
| 1129 | |
| 1130 | |
reed@google.com | 61eb040 | 2011-04-15 12:11:12 +0000 | [diff] [blame] | 1131 | static void rad_to_unit_matrix(const SkPoint& center, SkScalar radius, |
| 1132 | SkMatrix* matrix) { |
reed@android.com | 8a1c16f | 2008-12-17 15:59:43 +0000 | [diff] [blame] | 1133 | SkScalar inv = SkScalarInvert(radius); |
| 1134 | |
| 1135 | matrix->setTranslate(-center.fX, -center.fY); |
| 1136 | matrix->postScale(inv, inv); |
| 1137 | } |
| 1138 | |
| 1139 | class Radial_Gradient : public Gradient_Shader { |
| 1140 | public: |
| 1141 | Radial_Gradient(const SkPoint& center, SkScalar radius, |
| 1142 | const SkColor colors[], const SkScalar pos[], int colorCount, |
| 1143 | SkShader::TileMode mode, SkUnitMapper* mapper) |
vandebo@chromium.org | d3ae779 | 2011-02-24 00:21:06 +0000 | [diff] [blame] | 1144 | : Gradient_Shader(colors, pos, colorCount, mode, mapper), |
| 1145 | fCenter(center), |
| 1146 | fRadius(radius) |
reed@android.com | 8a1c16f | 2008-12-17 15:59:43 +0000 | [diff] [blame] | 1147 | { |
| 1148 | // make sure our table is insync with our current #define for kSQRT_TABLE_SIZE |
| 1149 | SkASSERT(sizeof(gSqrt8Table) == kSQRT_TABLE_SIZE); |
| 1150 | |
| 1151 | rad_to_unit_matrix(center, radius, &fPtsToUnit); |
| 1152 | } |
reed@google.com | 61eb040 | 2011-04-15 12:11:12 +0000 | [diff] [blame] | 1153 | |
reed@google.com | 8e6d914 | 2011-12-07 15:30:34 +0000 | [diff] [blame] | 1154 | virtual void shadeSpan(int x, int y, SkPMColor* dstC, int count) SK_OVERRIDE; |
reed@google.com | 7716afb | 2011-12-07 15:17:50 +0000 | [diff] [blame] | 1155 | virtual void shadeSpan16(int x, int y, uint16_t* SK_RESTRICT dstC, int count) SK_OVERRIDE { |
reed@android.com | 8a1c16f | 2008-12-17 15:59:43 +0000 | [diff] [blame] | 1156 | SkASSERT(count > 0); |
| 1157 | |
| 1158 | SkPoint srcPt; |
| 1159 | SkMatrix::MapXYProc dstProc = fDstToIndexProc; |
| 1160 | TileProc proc = fTileProc; |
reed@google.com | dd5bd67 | 2011-09-20 15:56:13 +0000 | [diff] [blame] | 1161 | const uint16_t* SK_RESTRICT cache = this->getCache16(); |
reed@android.com | 8a1c16f | 2008-12-17 15:59:43 +0000 | [diff] [blame] | 1162 | int toggle = ((x ^ y) & 1) << kCache16Bits; |
reed@android.com | 8a1c16f | 2008-12-17 15:59:43 +0000 | [diff] [blame] | 1163 | |
reed@android.com | 3c9b2a4 | 2009-08-27 19:28:37 +0000 | [diff] [blame] | 1164 | if (fDstToIndexClass != kPerspective_MatrixClass) { |
reed@google.com | dc731fd | 2010-12-23 15:19:47 +0000 | [diff] [blame] | 1165 | dstProc(fDstToIndex, SkIntToScalar(x) + SK_ScalarHalf, |
| 1166 | SkIntToScalar(y) + SK_ScalarHalf, &srcPt); |
reed@android.com | 8a1c16f | 2008-12-17 15:59:43 +0000 | [diff] [blame] | 1167 | SkFixed dx, fx = SkScalarToFixed(srcPt.fX); |
| 1168 | SkFixed dy, fy = SkScalarToFixed(srcPt.fY); |
| 1169 | |
reed@android.com | 3c9b2a4 | 2009-08-27 19:28:37 +0000 | [diff] [blame] | 1170 | if (fDstToIndexClass == kFixedStepInX_MatrixClass) { |
reed@android.com | 8a1c16f | 2008-12-17 15:59:43 +0000 | [diff] [blame] | 1171 | SkFixed storage[2]; |
| 1172 | (void)fDstToIndex.fixedStepInX(SkIntToScalar(y), &storage[0], &storage[1]); |
| 1173 | dx = storage[0]; |
| 1174 | dy = storage[1]; |
reed@android.com | 3c9b2a4 | 2009-08-27 19:28:37 +0000 | [diff] [blame] | 1175 | } else { |
reed@android.com | 8a1c16f | 2008-12-17 15:59:43 +0000 | [diff] [blame] | 1176 | SkASSERT(fDstToIndexClass == kLinear_MatrixClass); |
| 1177 | dx = SkScalarToFixed(fDstToIndex.getScaleX()); |
| 1178 | dy = SkScalarToFixed(fDstToIndex.getSkewY()); |
| 1179 | } |
| 1180 | |
reed@android.com | 3c9b2a4 | 2009-08-27 19:28:37 +0000 | [diff] [blame] | 1181 | if (proc == clamp_tileproc) { |
reed@google.com | dd5bd67 | 2011-09-20 15:56:13 +0000 | [diff] [blame] | 1182 | const uint8_t* SK_RESTRICT sqrt_table = gSqrt8Table; |
reed@android.com | 8a1c16f | 2008-12-17 15:59:43 +0000 | [diff] [blame] | 1183 | |
| 1184 | /* knock these down so we can pin against +- 0x7FFF, which is an immediate load, |
| 1185 | rather than 0xFFFF which is slower. This is a compromise, since it reduces our |
| 1186 | precision, but that appears to be visually OK. If we decide this is OK for |
| 1187 | all of our cases, we could (it seems) put this scale-down into fDstToIndex, |
| 1188 | to avoid having to do these extra shifts each time. |
| 1189 | */ |
| 1190 | fx >>= 1; |
| 1191 | dx >>= 1; |
| 1192 | fy >>= 1; |
| 1193 | dy >>= 1; |
reed@android.com | 3c9b2a4 | 2009-08-27 19:28:37 +0000 | [diff] [blame] | 1194 | 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] | 1195 | fy = SkPin32(fy, -0xFFFF >> 1, 0xFFFF >> 1); |
| 1196 | fy *= fy; |
| 1197 | do { |
| 1198 | unsigned xx = SkPin32(fx, -0xFFFF >> 1, 0xFFFF >> 1); |
| 1199 | unsigned fi = (xx * xx + fy) >> (14 + 16 - kSQRT_TABLE_BITS); |
| 1200 | fi = SkFastMin32(fi, 0xFFFF >> (16 - kSQRT_TABLE_BITS)); |
| 1201 | fx += dx; |
reed@android.com | 8a1c16f | 2008-12-17 15:59:43 +0000 | [diff] [blame] | 1202 | *dstC++ = cache[toggle + (sqrt_table[fi] >> (8 - kCache16Bits))]; |
| 1203 | toggle ^= (1 << kCache16Bits); |
reed@android.com | 8a1c16f | 2008-12-17 15:59:43 +0000 | [diff] [blame] | 1204 | } while (--count != 0); |
reed@android.com | 3c9b2a4 | 2009-08-27 19:28:37 +0000 | [diff] [blame] | 1205 | } else { |
reed@android.com | 8a1c16f | 2008-12-17 15:59:43 +0000 | [diff] [blame] | 1206 | do { |
| 1207 | unsigned xx = SkPin32(fx, -0xFFFF >> 1, 0xFFFF >> 1); |
| 1208 | unsigned fi = SkPin32(fy, -0xFFFF >> 1, 0xFFFF >> 1); |
| 1209 | fi = (xx * xx + fi * fi) >> (14 + 16 - kSQRT_TABLE_BITS); |
| 1210 | fi = SkFastMin32(fi, 0xFFFF >> (16 - kSQRT_TABLE_BITS)); |
| 1211 | fx += dx; |
| 1212 | fy += dy; |
reed@android.com | 8a1c16f | 2008-12-17 15:59:43 +0000 | [diff] [blame] | 1213 | *dstC++ = cache[toggle + (sqrt_table[fi] >> (8 - kCache16Bits))]; |
| 1214 | toggle ^= (1 << kCache16Bits); |
reed@android.com | 8a1c16f | 2008-12-17 15:59:43 +0000 | [diff] [blame] | 1215 | } while (--count != 0); |
| 1216 | } |
reed@android.com | 3c9b2a4 | 2009-08-27 19:28:37 +0000 | [diff] [blame] | 1217 | } else if (proc == mirror_tileproc) { |
reed@android.com | 8a1c16f | 2008-12-17 15:59:43 +0000 | [diff] [blame] | 1218 | do { |
| 1219 | SkFixed dist = SkFixedSqrt(SkFixedSquare(fx) + SkFixedSquare(fy)); |
| 1220 | unsigned fi = mirror_tileproc(dist); |
| 1221 | SkASSERT(fi <= 0xFFFF); |
| 1222 | fx += dx; |
| 1223 | fy += dy; |
reed@android.com | 8a1c16f | 2008-12-17 15:59:43 +0000 | [diff] [blame] | 1224 | *dstC++ = cache[toggle + (fi >> (16 - kCache16Bits))]; |
| 1225 | toggle ^= (1 << kCache16Bits); |
reed@android.com | 8a1c16f | 2008-12-17 15:59:43 +0000 | [diff] [blame] | 1226 | } while (--count != 0); |
reed@android.com | 3c9b2a4 | 2009-08-27 19:28:37 +0000 | [diff] [blame] | 1227 | } else { |
reed@android.com | 8a1c16f | 2008-12-17 15:59:43 +0000 | [diff] [blame] | 1228 | SkASSERT(proc == repeat_tileproc); |
| 1229 | do { |
| 1230 | SkFixed dist = SkFixedSqrt(SkFixedSquare(fx) + SkFixedSquare(fy)); |
| 1231 | unsigned fi = repeat_tileproc(dist); |
| 1232 | SkASSERT(fi <= 0xFFFF); |
| 1233 | fx += dx; |
| 1234 | fy += dy; |
reed@android.com | 8a1c16f | 2008-12-17 15:59:43 +0000 | [diff] [blame] | 1235 | *dstC++ = cache[toggle + (fi >> (16 - kCache16Bits))]; |
| 1236 | toggle ^= (1 << kCache16Bits); |
reed@android.com | 8a1c16f | 2008-12-17 15:59:43 +0000 | [diff] [blame] | 1237 | } while (--count != 0); |
| 1238 | } |
reed@android.com | 3c9b2a4 | 2009-08-27 19:28:37 +0000 | [diff] [blame] | 1239 | } else { // perspective case |
reed@android.com | 8a1c16f | 2008-12-17 15:59:43 +0000 | [diff] [blame] | 1240 | SkScalar dstX = SkIntToScalar(x); |
| 1241 | SkScalar dstY = SkIntToScalar(y); |
| 1242 | do { |
| 1243 | dstProc(fDstToIndex, dstX, dstY, &srcPt); |
| 1244 | unsigned fi = proc(SkScalarToFixed(srcPt.length())); |
| 1245 | SkASSERT(fi <= 0xFFFF); |
| 1246 | |
| 1247 | int index = fi >> (16 - kCache16Bits); |
reed@android.com | 8a1c16f | 2008-12-17 15:59:43 +0000 | [diff] [blame] | 1248 | *dstC++ = cache[toggle + index]; |
| 1249 | toggle ^= (1 << kCache16Bits); |
reed@android.com | 8a1c16f | 2008-12-17 15:59:43 +0000 | [diff] [blame] | 1250 | |
| 1251 | dstX += SK_Scalar1; |
| 1252 | } while (--count != 0); |
| 1253 | } |
| 1254 | } |
| 1255 | |
reed@google.com | 55b8e8c | 2011-01-13 16:22:35 +0000 | [diff] [blame] | 1256 | virtual BitmapType asABitmap(SkBitmap* bitmap, |
| 1257 | SkMatrix* matrix, |
reed@google.com | dc731fd | 2010-12-23 15:19:47 +0000 | [diff] [blame] | 1258 | TileMode* xy, |
reed@google.com | 7716afb | 2011-12-07 15:17:50 +0000 | [diff] [blame] | 1259 | SkScalar* twoPointRadialParams) const SK_OVERRIDE { |
reed@google.com | dc731fd | 2010-12-23 15:19:47 +0000 | [diff] [blame] | 1260 | if (bitmap) { |
| 1261 | this->commonAsABitmap(bitmap); |
| 1262 | } |
| 1263 | if (matrix) { |
| 1264 | matrix->setScale(SkIntToScalar(kCache32Count), SkIntToScalar(kCache32Count)); |
| 1265 | matrix->preConcat(fPtsToUnit); |
| 1266 | } |
| 1267 | if (xy) { |
| 1268 | xy[0] = fTileMode; |
| 1269 | xy[1] = kClamp_TileMode; |
| 1270 | } |
| 1271 | return kRadial_BitmapType; |
| 1272 | } |
reed@google.com | 7716afb | 2011-12-07 15:17:50 +0000 | [diff] [blame] | 1273 | virtual GradientType asAGradient(GradientInfo* info) const SK_OVERRIDE { |
vandebo@chromium.org | d3ae779 | 2011-02-24 00:21:06 +0000 | [diff] [blame] | 1274 | if (info) { |
| 1275 | commonAsAGradient(info); |
| 1276 | info->fPoint[0] = fCenter; |
| 1277 | info->fRadius[0] = fRadius; |
| 1278 | } |
| 1279 | return kRadial_GradientType; |
| 1280 | } |
reed@google.com | 55b8e8c | 2011-01-13 16:22:35 +0000 | [diff] [blame] | 1281 | |
reed@google.com | 8e6d914 | 2011-12-07 15:30:34 +0000 | [diff] [blame] | 1282 | static SkFlattenable* CreateProc(SkFlattenableReadBuffer& buffer) { |
reed@android.com | 8a1c16f | 2008-12-17 15:59:43 +0000 | [diff] [blame] | 1283 | return SkNEW_ARGS(Radial_Gradient, (buffer)); |
| 1284 | } |
| 1285 | |
reed@google.com | 7716afb | 2011-12-07 15:17:50 +0000 | [diff] [blame] | 1286 | virtual void flatten(SkFlattenableWriteBuffer& buffer) SK_OVERRIDE { |
vandebo@chromium.org | d3ae779 | 2011-02-24 00:21:06 +0000 | [diff] [blame] | 1287 | this->INHERITED::flatten(buffer); |
| 1288 | buffer.writeScalar(fCenter.fX); |
| 1289 | buffer.writeScalar(fCenter.fY); |
| 1290 | buffer.writeScalar(fRadius); |
| 1291 | } |
| 1292 | |
reed@android.com | 8a1c16f | 2008-12-17 15:59:43 +0000 | [diff] [blame] | 1293 | protected: |
vandebo@chromium.org | d3ae779 | 2011-02-24 00:21:06 +0000 | [diff] [blame] | 1294 | Radial_Gradient(SkFlattenableReadBuffer& buffer) |
| 1295 | : Gradient_Shader(buffer), |
tomhudson@google.com | 9ce767c | 2011-04-25 20:49:39 +0000 | [diff] [blame] | 1296 | fCenter(unflatten_point(buffer)), |
vandebo@chromium.org | d3ae779 | 2011-02-24 00:21:06 +0000 | [diff] [blame] | 1297 | fRadius(buffer.readScalar()) { |
| 1298 | } |
reed@google.com | 7716afb | 2011-12-07 15:17:50 +0000 | [diff] [blame] | 1299 | virtual Factory getFactory() SK_OVERRIDE { return CreateProc; } |
reed@android.com | 8a1c16f | 2008-12-17 15:59:43 +0000 | [diff] [blame] | 1300 | |
| 1301 | private: |
| 1302 | typedef Gradient_Shader INHERITED; |
vandebo@chromium.org | d3ae779 | 2011-02-24 00:21:06 +0000 | [diff] [blame] | 1303 | const SkPoint fCenter; |
| 1304 | const SkScalar fRadius; |
reed@android.com | 8a1c16f | 2008-12-17 15:59:43 +0000 | [diff] [blame] | 1305 | }; |
| 1306 | |
tomhudson@google.com | 5ea050f | 2011-09-26 15:03:55 +0000 | [diff] [blame] | 1307 | static inline bool radial_completely_pinned(int fx, int dx, int fy, int dy) { |
| 1308 | // fast, overly-conservative test: checks unit square instead |
| 1309 | // of unit circle |
| 1310 | bool xClamped = (fx >= SK_FixedHalf && dx >= 0) || |
| 1311 | (fx <= -SK_FixedHalf && dx <= 0); |
| 1312 | bool yClamped = (fy >= SK_FixedHalf && dy >= 0) || |
| 1313 | (fy <= -SK_FixedHalf && dy <= 0); |
| 1314 | |
| 1315 | return xClamped || yClamped; |
| 1316 | } |
| 1317 | |
| 1318 | // Return true if (fx * fy) is always inside the unit circle |
| 1319 | // SkPin32 is expensive, but so are all the SkFixedMul in this test, |
| 1320 | // so it shouldn't be run if count is small. |
| 1321 | static inline bool no_need_for_radial_pin(int fx, int dx, |
| 1322 | int fy, int dy, int count) { |
| 1323 | SkASSERT(count > 0); |
| 1324 | if (SkAbs32(fx) > 0x7FFF || SkAbs32(fy) > 0x7FFF) { |
| 1325 | return false; |
| 1326 | } |
| 1327 | if (fx*fx + fy*fy > 0x7FFF*0x7FFF) { |
| 1328 | return false; |
| 1329 | } |
| 1330 | fx += (count - 1) * dx; |
| 1331 | fy += (count - 1) * dy; |
| 1332 | if (SkAbs32(fx) > 0x7FFF || SkAbs32(fy) > 0x7FFF) { |
| 1333 | return false; |
| 1334 | } |
| 1335 | return fx*fx + fy*fy <= 0x7FFF*0x7FFF; |
| 1336 | } |
| 1337 | |
| 1338 | #define UNPINNED_RADIAL_STEP \ |
| 1339 | fi = (fx * fx + fy * fy) >> (14 + 16 - kSQRT_TABLE_BITS); \ |
| 1340 | *dstC++ = cache[sqrt_table[fi] >> (8 - kCache32Bits)]; \ |
| 1341 | fx += dx; \ |
| 1342 | fy += dy; |
| 1343 | |
| 1344 | // On Linux, this is faster with SkPMColor[] params than SkPMColor* SK_RESTRICT |
| 1345 | static void radial_clamp(SkFixed fx, SkFixed fy, SkFixed dx, SkFixed dy, |
tomhudson@google.com | 3e0f22c | 2011-09-30 14:31:28 +0000 | [diff] [blame] | 1346 | SkPMColor* SK_RESTRICT dstC, int count, |
| 1347 | const SkPMColor* SK_RESTRICT cache, |
tomhudson@google.com | 5ea050f | 2011-09-26 15:03:55 +0000 | [diff] [blame] | 1348 | const int kCache32Bits, const int kCache32Count) { |
| 1349 | // Floating point seems to be slower than fixed point, |
| 1350 | // even when we have float hardware. |
tomhudson@google.com | 3e0f22c | 2011-09-30 14:31:28 +0000 | [diff] [blame] | 1351 | const uint8_t* SK_RESTRICT sqrt_table = gSqrt8Table; |
tomhudson@google.com | 5ea050f | 2011-09-26 15:03:55 +0000 | [diff] [blame] | 1352 | fx >>= 1; |
| 1353 | dx >>= 1; |
| 1354 | fy >>= 1; |
| 1355 | dy >>= 1; |
| 1356 | if ((count > 4) && radial_completely_pinned(fx, dx, fy, dy)) { |
| 1357 | sk_memset32(dstC, cache[kCache32Count - 1], count); |
| 1358 | } else if ((count > 4) && |
| 1359 | no_need_for_radial_pin(fx, dx, fy, dy, count)) { |
| 1360 | unsigned fi; |
| 1361 | // 4x unroll appears to be no faster than 2x unroll on Linux |
| 1362 | while (count > 1) { |
| 1363 | UNPINNED_RADIAL_STEP; |
| 1364 | UNPINNED_RADIAL_STEP; |
| 1365 | count -= 2; |
| 1366 | } |
| 1367 | if (count) { |
| 1368 | UNPINNED_RADIAL_STEP; |
| 1369 | } |
| 1370 | } |
| 1371 | else { |
| 1372 | do { |
| 1373 | unsigned xx = SkPin32(fx, -0xFFFF >> 1, 0xFFFF >> 1); |
| 1374 | unsigned fi = SkPin32(fy, -0xFFFF >> 1, 0xFFFF >> 1); |
| 1375 | fi = (xx * xx + fi * fi) >> (14 + 16 - kSQRT_TABLE_BITS); |
| 1376 | fi = SkFastMin32(fi, 0xFFFF >> (16 - kSQRT_TABLE_BITS)); |
| 1377 | *dstC++ = cache[sqrt_table[fi] >> (8 - kCache32Bits)]; |
| 1378 | fx += dx; |
| 1379 | fy += dy; |
| 1380 | } while (--count != 0); |
| 1381 | } |
| 1382 | } |
| 1383 | |
| 1384 | void Radial_Gradient::shadeSpan(int x, int y, |
| 1385 | SkPMColor* SK_RESTRICT dstC, int count) { |
| 1386 | SkASSERT(count > 0); |
| 1387 | |
| 1388 | SkPoint srcPt; |
| 1389 | SkMatrix::MapXYProc dstProc = fDstToIndexProc; |
| 1390 | TileProc proc = fTileProc; |
tomhudson@google.com | 3e0f22c | 2011-09-30 14:31:28 +0000 | [diff] [blame] | 1391 | const SkPMColor* SK_RESTRICT cache = this->getCache32(); |
tomhudson@google.com | 5ea050f | 2011-09-26 15:03:55 +0000 | [diff] [blame] | 1392 | |
| 1393 | if (fDstToIndexClass != kPerspective_MatrixClass) { |
| 1394 | dstProc(fDstToIndex, SkIntToScalar(x) + SK_ScalarHalf, |
| 1395 | SkIntToScalar(y) + SK_ScalarHalf, &srcPt); |
| 1396 | SkFixed dx, fx = SkScalarToFixed(srcPt.fX); |
| 1397 | SkFixed dy, fy = SkScalarToFixed(srcPt.fY); |
| 1398 | #ifdef SK_USE_FLOAT_SQRT |
| 1399 | float fdx, fdy; |
| 1400 | #endif |
| 1401 | |
| 1402 | if (fDstToIndexClass == kFixedStepInX_MatrixClass) { |
| 1403 | SkFixed storage[2]; |
| 1404 | (void)fDstToIndex.fixedStepInX(SkIntToScalar(y), &storage[0], &storage[1]); |
| 1405 | dx = storage[0]; |
| 1406 | dy = storage[1]; |
| 1407 | #ifdef SK_USE_FLOAT_SQRT |
| 1408 | fdx = SkFixedToFloat(storage[0]); |
| 1409 | fdy = SkFixedToFloat(storage[1]); |
| 1410 | #endif |
| 1411 | } else { |
| 1412 | SkASSERT(fDstToIndexClass == kLinear_MatrixClass); |
| 1413 | dx = SkScalarToFixed(fDstToIndex.getScaleX()); |
| 1414 | dy = SkScalarToFixed(fDstToIndex.getSkewY()); |
| 1415 | #ifdef SK_USE_FLOAT_SQRT |
| 1416 | fdx = fDstToIndex.getScaleX(); |
| 1417 | fdy = fDstToIndex.getSkewY(); |
| 1418 | #endif |
| 1419 | } |
| 1420 | |
| 1421 | if (proc == clamp_tileproc) { |
| 1422 | radial_clamp(fx, fy, dx, dy, dstC, count, cache, |
| 1423 | kCache32Bits, kCache32Count); |
| 1424 | } else if (proc == mirror_tileproc) { |
| 1425 | #ifdef SK_USE_FLOAT_SQRT |
| 1426 | float ffx = srcPt.fX; |
| 1427 | float ffy = srcPt.fY; |
| 1428 | do { |
| 1429 | float fdist = sk_float_sqrt(ffx*ffx + ffy*ffy); |
| 1430 | unsigned fi = mirror_tileproc(SkFloatToFixed(fdist)); |
| 1431 | SkASSERT(fi <= 0xFFFF); |
| 1432 | *dstC++ = cache[fi >> (16 - kCache32Bits)]; |
| 1433 | ffx += fdx; |
| 1434 | ffy += fdy; |
| 1435 | } while (--count != 0); |
| 1436 | #else |
| 1437 | do { |
| 1438 | SkFixed magnitudeSquared = SkFixedSquare(fx) + |
| 1439 | SkFixedSquare(fy); |
| 1440 | if (magnitudeSquared < 0) // Overflow. |
| 1441 | magnitudeSquared = SK_FixedMax; |
| 1442 | SkFixed dist = SkFixedSqrt(magnitudeSquared); |
| 1443 | unsigned fi = mirror_tileproc(dist); |
| 1444 | SkASSERT(fi <= 0xFFFF); |
| 1445 | *dstC++ = cache[fi >> (16 - kCache32Bits)]; |
| 1446 | fx += dx; |
| 1447 | fy += dy; |
| 1448 | } while (--count != 0); |
| 1449 | #endif |
| 1450 | } else { |
| 1451 | SkASSERT(proc == repeat_tileproc); |
| 1452 | do { |
| 1453 | SkFixed magnitudeSquared = SkFixedSquare(fx) + |
| 1454 | SkFixedSquare(fy); |
| 1455 | if (magnitudeSquared < 0) // Overflow. |
| 1456 | magnitudeSquared = SK_FixedMax; |
| 1457 | SkFixed dist = SkFixedSqrt(magnitudeSquared); |
| 1458 | unsigned fi = repeat_tileproc(dist); |
| 1459 | SkASSERT(fi <= 0xFFFF); |
| 1460 | *dstC++ = cache[fi >> (16 - kCache32Bits)]; |
| 1461 | fx += dx; |
| 1462 | fy += dy; |
| 1463 | } while (--count != 0); |
| 1464 | } |
| 1465 | } else { // perspective case |
| 1466 | SkScalar dstX = SkIntToScalar(x); |
| 1467 | SkScalar dstY = SkIntToScalar(y); |
| 1468 | do { |
| 1469 | dstProc(fDstToIndex, dstX, dstY, &srcPt); |
| 1470 | unsigned fi = proc(SkScalarToFixed(srcPt.length())); |
| 1471 | SkASSERT(fi <= 0xFFFF); |
| 1472 | *dstC++ = cache[fi >> (16 - kCache32Bits)]; |
| 1473 | dstX += SK_Scalar1; |
| 1474 | } while (--count != 0); |
| 1475 | } |
| 1476 | } |
| 1477 | |
senorblanco@chromium.org | 7ef071f | 2009-09-22 17:25:29 +0000 | [diff] [blame] | 1478 | /* Two-point radial gradients are specified by two circles, each with a center |
| 1479 | point and radius. The gradient can be considered to be a series of |
| 1480 | concentric circles, with the color interpolated from the start circle |
| 1481 | (at t=0) to the end circle (at t=1). |
| 1482 | |
| 1483 | For each point (x, y) in the span, we want to find the |
| 1484 | interpolated circle that intersects that point. The center |
| 1485 | of the desired circle (Cx, Cy) falls at some distance t |
| 1486 | along the line segment between the start point (Sx, Sy) and |
| 1487 | end point (Ex, Ey): |
reed@google.com | 55b8e8c | 2011-01-13 16:22:35 +0000 | [diff] [blame] | 1488 | |
senorblanco@chromium.org | 7ef071f | 2009-09-22 17:25:29 +0000 | [diff] [blame] | 1489 | Cx = (1 - t) * Sx + t * Ex (0 <= t <= 1) |
| 1490 | Cy = (1 - t) * Sy + t * Ey |
reed@google.com | 55b8e8c | 2011-01-13 16:22:35 +0000 | [diff] [blame] | 1491 | |
senorblanco@chromium.org | 7ef071f | 2009-09-22 17:25:29 +0000 | [diff] [blame] | 1492 | The radius of the desired circle (r) is also a linear interpolation t |
| 1493 | between the start and end radii (Sr and Er): |
reed@google.com | 55b8e8c | 2011-01-13 16:22:35 +0000 | [diff] [blame] | 1494 | |
senorblanco@chromium.org | 7ef071f | 2009-09-22 17:25:29 +0000 | [diff] [blame] | 1495 | r = (1 - t) * Sr + t * Er |
reed@google.com | 55b8e8c | 2011-01-13 16:22:35 +0000 | [diff] [blame] | 1496 | |
senorblanco@chromium.org | 7ef071f | 2009-09-22 17:25:29 +0000 | [diff] [blame] | 1497 | But |
reed@google.com | 55b8e8c | 2011-01-13 16:22:35 +0000 | [diff] [blame] | 1498 | |
senorblanco@chromium.org | 7ef071f | 2009-09-22 17:25:29 +0000 | [diff] [blame] | 1499 | (x - Cx)^2 + (y - Cy)^2 = r^2 |
reed@google.com | 55b8e8c | 2011-01-13 16:22:35 +0000 | [diff] [blame] | 1500 | |
senorblanco@chromium.org | 7ef071f | 2009-09-22 17:25:29 +0000 | [diff] [blame] | 1501 | so |
reed@google.com | 55b8e8c | 2011-01-13 16:22:35 +0000 | [diff] [blame] | 1502 | |
senorblanco@chromium.org | 7ef071f | 2009-09-22 17:25:29 +0000 | [diff] [blame] | 1503 | (x - ((1 - t) * Sx + t * Ex))^2 |
| 1504 | + (y - ((1 - t) * Sy + t * Ey))^2 |
| 1505 | = ((1 - t) * Sr + t * Er)^2 |
reed@google.com | 55b8e8c | 2011-01-13 16:22:35 +0000 | [diff] [blame] | 1506 | |
senorblanco@chromium.org | 7ef071f | 2009-09-22 17:25:29 +0000 | [diff] [blame] | 1507 | Solving for t yields |
reed@google.com | 55b8e8c | 2011-01-13 16:22:35 +0000 | [diff] [blame] | 1508 | |
senorblanco@chromium.org | 7ef071f | 2009-09-22 17:25:29 +0000 | [diff] [blame] | 1509 | [(Sx - Ex)^2 + (Sy - Ey)^2 - (Er - Sr)^2)] * t^2 |
| 1510 | + [2 * (Sx - Ex)(x - Sx) + 2 * (Sy - Ey)(y - Sy) - 2 * (Er - Sr) * Sr] * t |
| 1511 | + [(x - Sx)^2 + (y - Sy)^2 - Sr^2] = 0 |
reed@google.com | 55b8e8c | 2011-01-13 16:22:35 +0000 | [diff] [blame] | 1512 | |
senorblanco@chromium.org | 7ef071f | 2009-09-22 17:25:29 +0000 | [diff] [blame] | 1513 | To simplify, let Dx = Sx - Ex, Dy = Sy - Ey, Dr = Er - Sr, dx = x - Sx, dy = y - Sy |
| 1514 | |
| 1515 | [Dx^2 + Dy^2 - Dr^2)] * t^2 |
| 1516 | + 2 * [Dx * dx + Dy * dy - Dr * Sr] * t |
| 1517 | + [dx^2 + dy^2 - Sr^2] = 0 |
reed@google.com | 55b8e8c | 2011-01-13 16:22:35 +0000 | [diff] [blame] | 1518 | |
| 1519 | 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] | 1520 | possible circles on which the point may fall. Solving for t yields |
| 1521 | the gradient value to use. |
reed@google.com | 55b8e8c | 2011-01-13 16:22:35 +0000 | [diff] [blame] | 1522 | |
senorblanco@chromium.org | 7ef071f | 2009-09-22 17:25:29 +0000 | [diff] [blame] | 1523 | If a<0, the start circle is entirely contained in the |
| 1524 | end circle, and one of the roots will be <0 or >1 (off the line |
| 1525 | segment). If a>0, the start circle falls at least partially |
| 1526 | outside the end circle (or vice versa), and the gradient |
| 1527 | defines a "tube" where a point may be on one circle (on the |
| 1528 | inside of the tube) or the other (outside of the tube). We choose |
| 1529 | one arbitrarily. |
reed@google.com | 55b8e8c | 2011-01-13 16:22:35 +0000 | [diff] [blame] | 1530 | |
senorblanco@chromium.org | 7ef071f | 2009-09-22 17:25:29 +0000 | [diff] [blame] | 1531 | In order to keep the math to within the limits of fixed point, |
| 1532 | we divide the entire quadratic by Dr^2, and replace |
| 1533 | (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] | 1534 | |
senorblanco@chromium.org | 7ef071f | 2009-09-22 17:25:29 +0000 | [diff] [blame] | 1535 | [Dx^2 / Dr^2 + Dy^2 / Dr^2 - 1)] * t^2 |
| 1536 | + 2 * [x' * Dx / Dr + y' * Dy / Dr - Sr / Dr] * t |
| 1537 | + [x'^2 + y'^2 - Sr^2/Dr^2] = 0 |
reed@google.com | 55b8e8c | 2011-01-13 16:22:35 +0000 | [diff] [blame] | 1538 | |
senorblanco@chromium.org | 7ef071f | 2009-09-22 17:25:29 +0000 | [diff] [blame] | 1539 | (x' and y' are computed by appending the subtract and scale to the |
| 1540 | fDstToIndex matrix in the constructor). |
| 1541 | |
| 1542 | Since the 'A' component of the quadratic is independent of x' and y', it |
| 1543 | is precomputed in the constructor. Since the 'B' component is linear in |
| 1544 | 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] | 1545 | 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] | 1546 | a perspective projection), it must be computed in the loop. |
| 1547 | |
| 1548 | */ |
| 1549 | |
reed@google.com | 84e9c08 | 2011-04-13 17:44:24 +0000 | [diff] [blame] | 1550 | static inline SkFixed two_point_radial(SkScalar b, SkScalar fx, SkScalar fy, |
| 1551 | SkScalar sr2d2, SkScalar foura, |
| 1552 | SkScalar oneOverTwoA, bool posRoot) { |
| 1553 | SkScalar c = SkScalarSquare(fx) + SkScalarSquare(fy) - sr2d2; |
reed@google.com | 8871a84 | 2011-06-23 15:07:04 +0000 | [diff] [blame] | 1554 | if (0 == foura) { |
| 1555 | return SkScalarToFixed(SkScalarDiv(-c, b)); |
| 1556 | } |
| 1557 | |
reed@google.com | 84e9c08 | 2011-04-13 17:44:24 +0000 | [diff] [blame] | 1558 | SkScalar discrim = SkScalarSquare(b) - SkScalarMul(foura, c); |
senorblanco@chromium.org | 7ef071f | 2009-09-22 17:25:29 +0000 | [diff] [blame] | 1559 | if (discrim < 0) { |
| 1560 | discrim = -discrim; |
| 1561 | } |
reed@google.com | 84e9c08 | 2011-04-13 17:44:24 +0000 | [diff] [blame] | 1562 | SkScalar rootDiscrim = SkScalarSqrt(discrim); |
| 1563 | SkScalar result; |
senorblanco@chromium.org | 7ef071f | 2009-09-22 17:25:29 +0000 | [diff] [blame] | 1564 | if (posRoot) { |
reed@google.com | 84e9c08 | 2011-04-13 17:44:24 +0000 | [diff] [blame] | 1565 | result = SkScalarMul(-b + rootDiscrim, oneOverTwoA); |
senorblanco@chromium.org | 7ef071f | 2009-09-22 17:25:29 +0000 | [diff] [blame] | 1566 | } else { |
reed@google.com | 84e9c08 | 2011-04-13 17:44:24 +0000 | [diff] [blame] | 1567 | result = SkScalarMul(-b - rootDiscrim, oneOverTwoA); |
senorblanco@chromium.org | 7ef071f | 2009-09-22 17:25:29 +0000 | [diff] [blame] | 1568 | } |
reed@google.com | 84e9c08 | 2011-04-13 17:44:24 +0000 | [diff] [blame] | 1569 | return SkScalarToFixed(result); |
senorblanco@chromium.org | 7ef071f | 2009-09-22 17:25:29 +0000 | [diff] [blame] | 1570 | } |
| 1571 | |
| 1572 | class Two_Point_Radial_Gradient : public Gradient_Shader { |
| 1573 | public: |
| 1574 | Two_Point_Radial_Gradient(const SkPoint& start, SkScalar startRadius, |
| 1575 | const SkPoint& end, SkScalar endRadius, |
| 1576 | const SkColor colors[], const SkScalar pos[], |
| 1577 | int colorCount, SkShader::TileMode mode, |
| 1578 | SkUnitMapper* mapper) |
vandebo@chromium.org | d3ae779 | 2011-02-24 00:21:06 +0000 | [diff] [blame] | 1579 | : Gradient_Shader(colors, pos, colorCount, mode, mapper), |
| 1580 | fCenter1(start), |
| 1581 | fCenter2(end), |
| 1582 | fRadius1(startRadius), |
| 1583 | fRadius2(endRadius) { |
| 1584 | init(); |
senorblanco@chromium.org | 7ef071f | 2009-09-22 17:25:29 +0000 | [diff] [blame] | 1585 | } |
reed@google.com | 55b8e8c | 2011-01-13 16:22:35 +0000 | [diff] [blame] | 1586 | |
| 1587 | virtual BitmapType asABitmap(SkBitmap* bitmap, |
| 1588 | SkMatrix* matrix, |
reed@google.com | dc731fd | 2010-12-23 15:19:47 +0000 | [diff] [blame] | 1589 | TileMode* xy, |
reed@google.com | 7c2f27d | 2011-03-07 19:29:00 +0000 | [diff] [blame] | 1590 | SkScalar* twoPointRadialParams) const { |
reed@google.com | dc731fd | 2010-12-23 15:19:47 +0000 | [diff] [blame] | 1591 | if (bitmap) { |
| 1592 | this->commonAsABitmap(bitmap); |
| 1593 | } |
| 1594 | SkScalar diffL = 0; // just to avoid gcc warning |
| 1595 | if (matrix || twoPointRadialParams) { |
reed@google.com | 55b8e8c | 2011-01-13 16:22:35 +0000 | [diff] [blame] | 1596 | diffL = SkScalarSqrt(SkScalarSquare(fDiff.fX) + |
reed@google.com | dc731fd | 2010-12-23 15:19:47 +0000 | [diff] [blame] | 1597 | SkScalarSquare(fDiff.fY)); |
| 1598 | } |
| 1599 | if (matrix) { |
bsalomon@google.com | dc66c42 | 2011-04-06 19:35:37 +0000 | [diff] [blame] | 1600 | if (diffL) { |
| 1601 | SkScalar invDiffL = SkScalarInvert(diffL); |
| 1602 | matrix->setSinCos(-SkScalarMul(invDiffL, fDiff.fY), |
| 1603 | SkScalarMul(invDiffL, fDiff.fX)); |
| 1604 | } else { |
| 1605 | matrix->reset(); |
| 1606 | } |
reed@google.com | dc731fd | 2010-12-23 15:19:47 +0000 | [diff] [blame] | 1607 | matrix->preConcat(fPtsToUnit); |
| 1608 | } |
| 1609 | if (xy) { |
| 1610 | xy[0] = fTileMode; |
| 1611 | xy[1] = kClamp_TileMode; |
| 1612 | } |
| 1613 | if (NULL != twoPointRadialParams) { |
| 1614 | twoPointRadialParams[0] = diffL; |
| 1615 | twoPointRadialParams[1] = fStartRadius; |
| 1616 | twoPointRadialParams[2] = fDiffRadius; |
| 1617 | } |
| 1618 | return kTwoPointRadial_BitmapType; |
| 1619 | } |
reed@google.com | 55b8e8c | 2011-01-13 16:22:35 +0000 | [diff] [blame] | 1620 | |
reed@google.com | 8e6d914 | 2011-12-07 15:30:34 +0000 | [diff] [blame] | 1621 | virtual GradientType asAGradient(GradientInfo* info) const SK_OVERRIDE { |
vandebo@chromium.org | d3ae779 | 2011-02-24 00:21:06 +0000 | [diff] [blame] | 1622 | if (info) { |
| 1623 | commonAsAGradient(info); |
| 1624 | info->fPoint[0] = fCenter1; |
| 1625 | info->fPoint[1] = fCenter2; |
| 1626 | info->fRadius[0] = fRadius1; |
| 1627 | info->fRadius[1] = fRadius2; |
| 1628 | } |
| 1629 | return kRadial2_GradientType; |
| 1630 | } |
| 1631 | |
reed@google.com | 8e6d914 | 2011-12-07 15:30:34 +0000 | [diff] [blame] | 1632 | virtual void shadeSpan(int x, int y, SkPMColor* SK_RESTRICT dstC, int count) SK_OVERRIDE { |
senorblanco@chromium.org | 7ef071f | 2009-09-22 17:25:29 +0000 | [diff] [blame] | 1633 | SkASSERT(count > 0); |
| 1634 | |
| 1635 | // Zero difference between radii: fill with transparent black. |
| 1636 | if (fDiffRadius == 0) { |
| 1637 | sk_bzero(dstC, count * sizeof(*dstC)); |
| 1638 | return; |
| 1639 | } |
| 1640 | SkMatrix::MapXYProc dstProc = fDstToIndexProc; |
| 1641 | TileProc proc = fTileProc; |
reed@google.com | dd5bd67 | 2011-09-20 15:56:13 +0000 | [diff] [blame] | 1642 | const SkPMColor* SK_RESTRICT cache = this->getCache32(); |
reed@google.com | 84e9c08 | 2011-04-13 17:44:24 +0000 | [diff] [blame] | 1643 | |
| 1644 | SkScalar foura = fA * 4; |
senorblanco@chromium.org | 7ef071f | 2009-09-22 17:25:29 +0000 | [diff] [blame] | 1645 | bool posRoot = fDiffRadius < 0; |
reed@google.com | 61eb040 | 2011-04-15 12:11:12 +0000 | [diff] [blame] | 1646 | if (fDstToIndexClass != kPerspective_MatrixClass) { |
senorblanco@chromium.org | 7ef071f | 2009-09-22 17:25:29 +0000 | [diff] [blame] | 1647 | SkPoint srcPt; |
reed@google.com | dc731fd | 2010-12-23 15:19:47 +0000 | [diff] [blame] | 1648 | dstProc(fDstToIndex, SkIntToScalar(x) + SK_ScalarHalf, |
| 1649 | SkIntToScalar(y) + SK_ScalarHalf, &srcPt); |
reed@google.com | 84e9c08 | 2011-04-13 17:44:24 +0000 | [diff] [blame] | 1650 | SkScalar dx, fx = srcPt.fX; |
| 1651 | SkScalar dy, fy = srcPt.fY; |
senorblanco@chromium.org | 7ef071f | 2009-09-22 17:25:29 +0000 | [diff] [blame] | 1652 | |
reed@google.com | 61eb040 | 2011-04-15 12:11:12 +0000 | [diff] [blame] | 1653 | if (fDstToIndexClass == kFixedStepInX_MatrixClass) { |
reed@google.com | 84e9c08 | 2011-04-13 17:44:24 +0000 | [diff] [blame] | 1654 | SkFixed fixedX, fixedY; |
| 1655 | (void)fDstToIndex.fixedStepInX(SkIntToScalar(y), &fixedX, &fixedY); |
| 1656 | dx = SkFixedToScalar(fixedX); |
| 1657 | dy = SkFixedToScalar(fixedY); |
reed@google.com | 61eb040 | 2011-04-15 12:11:12 +0000 | [diff] [blame] | 1658 | } else { |
senorblanco@chromium.org | 7ef071f | 2009-09-22 17:25:29 +0000 | [diff] [blame] | 1659 | SkASSERT(fDstToIndexClass == kLinear_MatrixClass); |
reed@google.com | 84e9c08 | 2011-04-13 17:44:24 +0000 | [diff] [blame] | 1660 | dx = fDstToIndex.getScaleX(); |
| 1661 | dy = fDstToIndex.getSkewY(); |
senorblanco@chromium.org | 7ef071f | 2009-09-22 17:25:29 +0000 | [diff] [blame] | 1662 | } |
reed@google.com | 84e9c08 | 2011-04-13 17:44:24 +0000 | [diff] [blame] | 1663 | SkScalar b = (SkScalarMul(fDiff.fX, fx) + |
| 1664 | SkScalarMul(fDiff.fY, fy) - fStartRadius) * 2; |
| 1665 | SkScalar db = (SkScalarMul(fDiff.fX, dx) + |
| 1666 | SkScalarMul(fDiff.fY, dy)) * 2; |
reed@google.com | 61eb040 | 2011-04-15 12:11:12 +0000 | [diff] [blame] | 1667 | if (proc == clamp_tileproc) { |
senorblanco@chromium.org | 7ef071f | 2009-09-22 17:25:29 +0000 | [diff] [blame] | 1668 | for (; count > 0; --count) { |
reed@google.com | 84e9c08 | 2011-04-13 17:44:24 +0000 | [diff] [blame] | 1669 | 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] | 1670 | SkFixed index = SkClampMax(t, 0xFFFF); |
| 1671 | SkASSERT(index <= 0xFFFF); |
| 1672 | *dstC++ = cache[index >> (16 - kCache32Bits)]; |
| 1673 | fx += dx; |
| 1674 | fy += dy; |
| 1675 | b += db; |
| 1676 | } |
reed@google.com | 61eb040 | 2011-04-15 12:11:12 +0000 | [diff] [blame] | 1677 | } else if (proc == mirror_tileproc) { |
senorblanco@chromium.org | 7ef071f | 2009-09-22 17:25:29 +0000 | [diff] [blame] | 1678 | for (; count > 0; --count) { |
reed@google.com | 84e9c08 | 2011-04-13 17:44:24 +0000 | [diff] [blame] | 1679 | 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] | 1680 | SkFixed index = mirror_tileproc(t); |
| 1681 | SkASSERT(index <= 0xFFFF); |
| 1682 | *dstC++ = cache[index >> (16 - kCache32Bits)]; |
| 1683 | fx += dx; |
| 1684 | fy += dy; |
| 1685 | b += db; |
| 1686 | } |
reed@google.com | 61eb040 | 2011-04-15 12:11:12 +0000 | [diff] [blame] | 1687 | } else { |
senorblanco@chromium.org | 7ef071f | 2009-09-22 17:25:29 +0000 | [diff] [blame] | 1688 | SkASSERT(proc == repeat_tileproc); |
| 1689 | for (; count > 0; --count) { |
reed@google.com | 84e9c08 | 2011-04-13 17:44:24 +0000 | [diff] [blame] | 1690 | 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] | 1691 | SkFixed index = repeat_tileproc(t); |
| 1692 | SkASSERT(index <= 0xFFFF); |
| 1693 | *dstC++ = cache[index >> (16 - kCache32Bits)]; |
| 1694 | fx += dx; |
| 1695 | fy += dy; |
| 1696 | b += db; |
| 1697 | } |
| 1698 | } |
reed@google.com | 61eb040 | 2011-04-15 12:11:12 +0000 | [diff] [blame] | 1699 | } else { // perspective case |
reed@android.com | 6c59a17 | 2009-09-22 20:24:05 +0000 | [diff] [blame] | 1700 | SkScalar dstX = SkIntToScalar(x); |
| 1701 | SkScalar dstY = SkIntToScalar(y); |
senorblanco@chromium.org | 7ef071f | 2009-09-22 17:25:29 +0000 | [diff] [blame] | 1702 | for (; count > 0; --count) { |
| 1703 | SkPoint srcPt; |
reed@android.com | 6c59a17 | 2009-09-22 20:24:05 +0000 | [diff] [blame] | 1704 | dstProc(fDstToIndex, dstX, dstY, &srcPt); |
reed@google.com | 84e9c08 | 2011-04-13 17:44:24 +0000 | [diff] [blame] | 1705 | SkScalar fx = srcPt.fX; |
| 1706 | SkScalar fy = srcPt.fY; |
| 1707 | SkScalar b = (SkScalarMul(fDiff.fX, fx) + |
| 1708 | SkScalarMul(fDiff.fY, fy) - fStartRadius) * 2; |
| 1709 | 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] | 1710 | SkFixed index = proc(t); |
| 1711 | SkASSERT(index <= 0xFFFF); |
| 1712 | *dstC++ = cache[index >> (16 - kCache32Bits)]; |
reed@android.com | 6c59a17 | 2009-09-22 20:24:05 +0000 | [diff] [blame] | 1713 | dstX += SK_Scalar1; |
senorblanco@chromium.org | 7ef071f | 2009-09-22 17:25:29 +0000 | [diff] [blame] | 1714 | } |
| 1715 | } |
| 1716 | } |
| 1717 | |
reed@android.com | 6c59a17 | 2009-09-22 20:24:05 +0000 | [diff] [blame] | 1718 | virtual bool setContext(const SkBitmap& device, |
| 1719 | const SkPaint& paint, |
reed@google.com | 8e6d914 | 2011-12-07 15:30:34 +0000 | [diff] [blame] | 1720 | const SkMatrix& matrix) SK_OVERRIDE { |
| 1721 | if (!this->INHERITED::setContext(device, paint, matrix)) { |
reed@android.com | 6c59a17 | 2009-09-22 20:24:05 +0000 | [diff] [blame] | 1722 | return false; |
| 1723 | } |
| 1724 | |
| 1725 | // we don't have a span16 proc |
| 1726 | fFlags &= ~kHasSpan16_Flag; |
| 1727 | return true; |
| 1728 | } |
| 1729 | |
reed@google.com | 8e6d914 | 2011-12-07 15:30:34 +0000 | [diff] [blame] | 1730 | static SkFlattenable* CreateProc(SkFlattenableReadBuffer& buffer) { |
senorblanco@chromium.org | 7ef071f | 2009-09-22 17:25:29 +0000 | [diff] [blame] | 1731 | return SkNEW_ARGS(Two_Point_Radial_Gradient, (buffer)); |
| 1732 | } |
| 1733 | |
reed@google.com | 7716afb | 2011-12-07 15:17:50 +0000 | [diff] [blame] | 1734 | virtual void flatten(SkFlattenableWriteBuffer& buffer) SK_OVERRIDE { |
reed@android.com | bcfc733 | 2009-11-10 16:19:39 +0000 | [diff] [blame] | 1735 | this->INHERITED::flatten(buffer); |
vandebo@chromium.org | d3ae779 | 2011-02-24 00:21:06 +0000 | [diff] [blame] | 1736 | buffer.writeScalar(fCenter1.fX); |
| 1737 | buffer.writeScalar(fCenter1.fY); |
| 1738 | buffer.writeScalar(fCenter2.fX); |
| 1739 | buffer.writeScalar(fCenter2.fY); |
| 1740 | buffer.writeScalar(fRadius1); |
| 1741 | buffer.writeScalar(fRadius2); |
reed@android.com | bcfc733 | 2009-11-10 16:19:39 +0000 | [diff] [blame] | 1742 | } |
reed@google.com | 55b8e8c | 2011-01-13 16:22:35 +0000 | [diff] [blame] | 1743 | |
senorblanco@chromium.org | 7ef071f | 2009-09-22 17:25:29 +0000 | [diff] [blame] | 1744 | protected: |
reed@android.com | bcfc733 | 2009-11-10 16:19:39 +0000 | [diff] [blame] | 1745 | Two_Point_Radial_Gradient(SkFlattenableReadBuffer& buffer) |
vandebo@chromium.org | d3ae779 | 2011-02-24 00:21:06 +0000 | [diff] [blame] | 1746 | : Gradient_Shader(buffer), |
tomhudson@google.com | 9ce767c | 2011-04-25 20:49:39 +0000 | [diff] [blame] | 1747 | fCenter1(unflatten_point(buffer)), |
| 1748 | fCenter2(unflatten_point(buffer)), |
vandebo@chromium.org | d3ae779 | 2011-02-24 00:21:06 +0000 | [diff] [blame] | 1749 | fRadius1(buffer.readScalar()), |
| 1750 | fRadius2(buffer.readScalar()) { |
| 1751 | init(); |
reed@android.com | bcfc733 | 2009-11-10 16:19:39 +0000 | [diff] [blame] | 1752 | }; |
reed@google.com | 7716afb | 2011-12-07 15:17:50 +0000 | [diff] [blame] | 1753 | virtual Factory getFactory() SK_OVERRIDE { return CreateProc; } |
senorblanco@chromium.org | 7ef071f | 2009-09-22 17:25:29 +0000 | [diff] [blame] | 1754 | |
| 1755 | private: |
| 1756 | typedef Gradient_Shader INHERITED; |
vandebo@chromium.org | d3ae779 | 2011-02-24 00:21:06 +0000 | [diff] [blame] | 1757 | const SkPoint fCenter1; |
| 1758 | const SkPoint fCenter2; |
| 1759 | const SkScalar fRadius1; |
| 1760 | const SkScalar fRadius2; |
senorblanco@chromium.org | 7ef071f | 2009-09-22 17:25:29 +0000 | [diff] [blame] | 1761 | SkPoint fDiff; |
| 1762 | SkScalar fStartRadius, fDiffRadius, fSr2D2, fA, fOneOverTwoA; |
vandebo@chromium.org | d3ae779 | 2011-02-24 00:21:06 +0000 | [diff] [blame] | 1763 | |
| 1764 | void init() { |
| 1765 | fDiff = fCenter1 - fCenter2; |
| 1766 | fDiffRadius = fRadius2 - fRadius1; |
| 1767 | SkScalar inv = SkScalarInvert(fDiffRadius); |
| 1768 | fDiff.fX = SkScalarMul(fDiff.fX, inv); |
| 1769 | fDiff.fY = SkScalarMul(fDiff.fY, inv); |
| 1770 | fStartRadius = SkScalarMul(fRadius1, inv); |
| 1771 | fSr2D2 = SkScalarSquare(fStartRadius); |
| 1772 | fA = SkScalarSquare(fDiff.fX) + SkScalarSquare(fDiff.fY) - SK_Scalar1; |
reed@google.com | 21031e9 | 2011-06-27 18:38:27 +0000 | [diff] [blame] | 1773 | fOneOverTwoA = fA ? SkScalarInvert(fA * 2) : 0; |
vandebo@chromium.org | d3ae779 | 2011-02-24 00:21:06 +0000 | [diff] [blame] | 1774 | |
| 1775 | fPtsToUnit.setTranslate(-fCenter1.fX, -fCenter1.fY); |
| 1776 | fPtsToUnit.postScale(inv, inv); |
| 1777 | } |
senorblanco@chromium.org | 7ef071f | 2009-09-22 17:25:29 +0000 | [diff] [blame] | 1778 | }; |
| 1779 | |
reed@android.com | 8a1c16f | 2008-12-17 15:59:43 +0000 | [diff] [blame] | 1780 | /////////////////////////////////////////////////////////////////////////////// |
| 1781 | |
| 1782 | class Sweep_Gradient : public Gradient_Shader { |
| 1783 | public: |
| 1784 | Sweep_Gradient(SkScalar cx, SkScalar cy, const SkColor colors[], |
| 1785 | const SkScalar pos[], int count, SkUnitMapper* mapper) |
vandebo@chromium.org | d3ae779 | 2011-02-24 00:21:06 +0000 | [diff] [blame] | 1786 | : Gradient_Shader(colors, pos, count, SkShader::kClamp_TileMode, mapper), |
| 1787 | fCenter(SkPoint::Make(cx, cy)) |
reed@android.com | 8a1c16f | 2008-12-17 15:59:43 +0000 | [diff] [blame] | 1788 | { |
| 1789 | fPtsToUnit.setTranslate(-cx, -cy); |
| 1790 | } |
reed@google.com | 7716afb | 2011-12-07 15:17:50 +0000 | [diff] [blame] | 1791 | virtual void shadeSpan(int x, int y, SkPMColor dstC[], int count) SK_OVERRIDE; |
| 1792 | virtual void shadeSpan16(int x, int y, uint16_t dstC[], int count) SK_OVERRIDE; |
reed@google.com | 55b8e8c | 2011-01-13 16:22:35 +0000 | [diff] [blame] | 1793 | |
| 1794 | virtual BitmapType asABitmap(SkBitmap* bitmap, |
| 1795 | SkMatrix* matrix, |
reed@google.com | dc731fd | 2010-12-23 15:19:47 +0000 | [diff] [blame] | 1796 | TileMode* xy, |
reed@google.com | 7716afb | 2011-12-07 15:17:50 +0000 | [diff] [blame] | 1797 | SkScalar* twoPointRadialParams) const SK_OVERRIDE { |
reed@google.com | dc731fd | 2010-12-23 15:19:47 +0000 | [diff] [blame] | 1798 | if (bitmap) { |
| 1799 | this->commonAsABitmap(bitmap); |
| 1800 | } |
| 1801 | if (matrix) { |
| 1802 | *matrix = fPtsToUnit; |
| 1803 | } |
| 1804 | if (xy) { |
| 1805 | xy[0] = fTileMode; |
| 1806 | xy[1] = kClamp_TileMode; |
| 1807 | } |
| 1808 | return kSweep_BitmapType; |
| 1809 | } |
| 1810 | |
reed@google.com | 7716afb | 2011-12-07 15:17:50 +0000 | [diff] [blame] | 1811 | virtual GradientType asAGradient(GradientInfo* info) const SK_OVERRIDE { |
vandebo@chromium.org | d3ae779 | 2011-02-24 00:21:06 +0000 | [diff] [blame] | 1812 | if (info) { |
| 1813 | commonAsAGradient(info); |
| 1814 | info->fPoint[0] = fCenter; |
| 1815 | } |
| 1816 | return kSweep_GradientType; |
| 1817 | } |
| 1818 | |
reed@google.com | 8e6d914 | 2011-12-07 15:30:34 +0000 | [diff] [blame] | 1819 | static SkFlattenable* CreateProc(SkFlattenableReadBuffer& buffer) { |
reed@android.com | 8a1c16f | 2008-12-17 15:59:43 +0000 | [diff] [blame] | 1820 | return SkNEW_ARGS(Sweep_Gradient, (buffer)); |
| 1821 | } |
| 1822 | |
reed@google.com | 7716afb | 2011-12-07 15:17:50 +0000 | [diff] [blame] | 1823 | virtual void flatten(SkFlattenableWriteBuffer& buffer) SK_OVERRIDE { |
vandebo@chromium.org | d3ae779 | 2011-02-24 00:21:06 +0000 | [diff] [blame] | 1824 | this->INHERITED::flatten(buffer); |
| 1825 | buffer.writeScalar(fCenter.fX); |
| 1826 | buffer.writeScalar(fCenter.fY); |
| 1827 | } |
| 1828 | |
reed@android.com | 8a1c16f | 2008-12-17 15:59:43 +0000 | [diff] [blame] | 1829 | protected: |
vandebo@chromium.org | d3ae779 | 2011-02-24 00:21:06 +0000 | [diff] [blame] | 1830 | Sweep_Gradient(SkFlattenableReadBuffer& buffer) |
| 1831 | : Gradient_Shader(buffer), |
tomhudson@google.com | 9ce767c | 2011-04-25 20:49:39 +0000 | [diff] [blame] | 1832 | fCenter(unflatten_point(buffer)) { |
vandebo@chromium.org | d3ae779 | 2011-02-24 00:21:06 +0000 | [diff] [blame] | 1833 | } |
| 1834 | |
reed@google.com | 7716afb | 2011-12-07 15:17:50 +0000 | [diff] [blame] | 1835 | virtual Factory getFactory() SK_OVERRIDE { return CreateProc; } |
reed@android.com | 8a1c16f | 2008-12-17 15:59:43 +0000 | [diff] [blame] | 1836 | |
| 1837 | private: |
| 1838 | typedef Gradient_Shader INHERITED; |
vandebo@chromium.org | d3ae779 | 2011-02-24 00:21:06 +0000 | [diff] [blame] | 1839 | const SkPoint fCenter; |
reed@android.com | 8a1c16f | 2008-12-17 15:59:43 +0000 | [diff] [blame] | 1840 | }; |
| 1841 | |
| 1842 | #ifdef COMPUTE_SWEEP_TABLE |
| 1843 | #define PI 3.14159265 |
| 1844 | static bool gSweepTableReady; |
| 1845 | static uint8_t gSweepTable[65]; |
| 1846 | |
| 1847 | /* Our table stores precomputed values for atan: [0...1] -> [0..PI/4] |
| 1848 | We scale the results to [0..32] |
| 1849 | */ |
reed@google.com | 61eb040 | 2011-04-15 12:11:12 +0000 | [diff] [blame] | 1850 | static const uint8_t* build_sweep_table() { |
| 1851 | if (!gSweepTableReady) { |
reed@android.com | 8a1c16f | 2008-12-17 15:59:43 +0000 | [diff] [blame] | 1852 | const int N = 65; |
| 1853 | const double DENOM = N - 1; |
reed@google.com | 55b8e8c | 2011-01-13 16:22:35 +0000 | [diff] [blame] | 1854 | |
reed@android.com | 8a1c16f | 2008-12-17 15:59:43 +0000 | [diff] [blame] | 1855 | for (int i = 0; i < N; i++) |
| 1856 | { |
| 1857 | double arg = i / DENOM; |
| 1858 | double v = atan(arg); |
| 1859 | int iv = (int)round(v * DENOM * 2 / PI); |
| 1860 | // printf("[%d] atan(%g) = %g %d\n", i, arg, v, iv); |
| 1861 | printf("%d, ", iv); |
| 1862 | gSweepTable[i] = iv; |
| 1863 | } |
| 1864 | gSweepTableReady = true; |
| 1865 | } |
| 1866 | return gSweepTable; |
| 1867 | } |
| 1868 | #else |
| 1869 | static const uint8_t gSweepTable[] = { |
| 1870 | 0, 1, 1, 2, 3, 3, 4, 4, 5, 6, 6, 7, 8, 8, 9, 9, |
| 1871 | 10, 11, 11, 12, 12, 13, 13, 14, 15, 15, 16, 16, 17, 17, 18, 18, |
| 1872 | 19, 19, 20, 20, 21, 21, 22, 22, 23, 23, 24, 24, 25, 25, 25, 26, |
| 1873 | 26, 27, 27, 27, 28, 28, 29, 29, 29, 30, 30, 30, 31, 31, 31, 32, |
| 1874 | 32 |
| 1875 | }; |
| 1876 | static const uint8_t* build_sweep_table() { return gSweepTable; } |
| 1877 | #endif |
| 1878 | |
| 1879 | // divide numer/denom, with a bias of 6bits. Assumes numer <= denom |
| 1880 | // and denom != 0. Since our table is 6bits big (+1), this is a nice fit. |
| 1881 | // Same as (but faster than) SkFixedDiv(numer, denom) >> 10 |
| 1882 | |
| 1883 | //unsigned div_64(int numer, int denom); |
reed@google.com | 61eb040 | 2011-04-15 12:11:12 +0000 | [diff] [blame] | 1884 | static unsigned div_64(int numer, int denom) { |
reed@android.com | 8a1c16f | 2008-12-17 15:59:43 +0000 | [diff] [blame] | 1885 | SkASSERT(numer <= denom); |
| 1886 | SkASSERT(numer > 0); |
| 1887 | SkASSERT(denom > 0); |
reed@google.com | 55b8e8c | 2011-01-13 16:22:35 +0000 | [diff] [blame] | 1888 | |
reed@android.com | 8a1c16f | 2008-12-17 15:59:43 +0000 | [diff] [blame] | 1889 | int nbits = SkCLZ(numer); |
| 1890 | int dbits = SkCLZ(denom); |
| 1891 | int bits = 6 - nbits + dbits; |
| 1892 | SkASSERT(bits <= 6); |
reed@google.com | 55b8e8c | 2011-01-13 16:22:35 +0000 | [diff] [blame] | 1893 | |
reed@google.com | 61eb040 | 2011-04-15 12:11:12 +0000 | [diff] [blame] | 1894 | if (bits < 0) { // detect underflow |
reed@android.com | 8a1c16f | 2008-12-17 15:59:43 +0000 | [diff] [blame] | 1895 | return 0; |
reed@google.com | 61eb040 | 2011-04-15 12:11:12 +0000 | [diff] [blame] | 1896 | } |
reed@android.com | 8a1c16f | 2008-12-17 15:59:43 +0000 | [diff] [blame] | 1897 | |
| 1898 | denom <<= dbits - 1; |
| 1899 | numer <<= nbits - 1; |
| 1900 | |
| 1901 | unsigned result = 0; |
| 1902 | |
| 1903 | // do the first one |
reed@google.com | 61eb040 | 2011-04-15 12:11:12 +0000 | [diff] [blame] | 1904 | if ((numer -= denom) >= 0) { |
reed@android.com | 8a1c16f | 2008-12-17 15:59:43 +0000 | [diff] [blame] | 1905 | result = 1; |
reed@google.com | 61eb040 | 2011-04-15 12:11:12 +0000 | [diff] [blame] | 1906 | } else { |
reed@android.com | 8a1c16f | 2008-12-17 15:59:43 +0000 | [diff] [blame] | 1907 | numer += denom; |
reed@google.com | 61eb040 | 2011-04-15 12:11:12 +0000 | [diff] [blame] | 1908 | } |
reed@google.com | 55b8e8c | 2011-01-13 16:22:35 +0000 | [diff] [blame] | 1909 | |
reed@android.com | 8a1c16f | 2008-12-17 15:59:43 +0000 | [diff] [blame] | 1910 | // 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] | 1911 | if (bits > 0) { |
reed@android.com | 8a1c16f | 2008-12-17 15:59:43 +0000 | [diff] [blame] | 1912 | // make room for the rest of the answer bits |
| 1913 | result <<= bits; |
| 1914 | switch (bits) { |
| 1915 | case 6: |
| 1916 | if ((numer = (numer << 1) - denom) >= 0) |
| 1917 | result |= 32; |
| 1918 | else |
| 1919 | numer += denom; |
| 1920 | case 5: |
| 1921 | if ((numer = (numer << 1) - denom) >= 0) |
| 1922 | result |= 16; |
| 1923 | else |
| 1924 | numer += denom; |
| 1925 | case 4: |
| 1926 | if ((numer = (numer << 1) - denom) >= 0) |
| 1927 | result |= 8; |
| 1928 | else |
| 1929 | numer += denom; |
| 1930 | case 3: |
| 1931 | if ((numer = (numer << 1) - denom) >= 0) |
| 1932 | result |= 4; |
| 1933 | else |
| 1934 | numer += denom; |
| 1935 | case 2: |
| 1936 | if ((numer = (numer << 1) - denom) >= 0) |
| 1937 | result |= 2; |
| 1938 | else |
| 1939 | numer += denom; |
| 1940 | case 1: |
| 1941 | default: // not strictly need, but makes GCC make better ARM code |
| 1942 | if ((numer = (numer << 1) - denom) >= 0) |
| 1943 | result |= 1; |
| 1944 | else |
| 1945 | numer += denom; |
| 1946 | } |
| 1947 | } |
| 1948 | return result; |
| 1949 | } |
| 1950 | |
| 1951 | // 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] | 1952 | static unsigned atan_0_90(SkFixed y, SkFixed x) { |
reed@android.com | 8a1c16f | 2008-12-17 15:59:43 +0000 | [diff] [blame] | 1953 | #ifdef SK_DEBUG |
| 1954 | { |
| 1955 | static bool gOnce; |
reed@google.com | 61eb040 | 2011-04-15 12:11:12 +0000 | [diff] [blame] | 1956 | if (!gOnce) { |
reed@android.com | 8a1c16f | 2008-12-17 15:59:43 +0000 | [diff] [blame] | 1957 | gOnce = true; |
| 1958 | SkASSERT(div_64(55, 55) == 64); |
| 1959 | SkASSERT(div_64(128, 256) == 32); |
| 1960 | SkASSERT(div_64(2326528, 4685824) == 31); |
| 1961 | SkASSERT(div_64(753664, 5210112) == 9); |
| 1962 | SkASSERT(div_64(229376, 4882432) == 3); |
| 1963 | SkASSERT(div_64(2, 64) == 2); |
| 1964 | SkASSERT(div_64(1, 64) == 1); |
| 1965 | // test that we handle underflow correctly |
| 1966 | SkASSERT(div_64(12345, 0x54321234) == 0); |
| 1967 | } |
| 1968 | } |
| 1969 | #endif |
| 1970 | |
| 1971 | SkASSERT(y > 0 && x > 0); |
| 1972 | const uint8_t* table = build_sweep_table(); |
| 1973 | |
| 1974 | unsigned result; |
| 1975 | bool swap = (x < y); |
reed@google.com | 61eb040 | 2011-04-15 12:11:12 +0000 | [diff] [blame] | 1976 | if (swap) { |
reed@android.com | 8a1c16f | 2008-12-17 15:59:43 +0000 | [diff] [blame] | 1977 | // first part of the atan(v) = PI/2 - atan(1/v) identity |
| 1978 | // since our div_64 and table want v <= 1, where v = y/x |
| 1979 | SkTSwap<SkFixed>(x, y); |
| 1980 | } |
| 1981 | |
| 1982 | result = div_64(y, x); |
reed@google.com | 55b8e8c | 2011-01-13 16:22:35 +0000 | [diff] [blame] | 1983 | |
reed@android.com | 8a1c16f | 2008-12-17 15:59:43 +0000 | [diff] [blame] | 1984 | #ifdef SK_DEBUG |
| 1985 | { |
| 1986 | unsigned result2 = SkDivBits(y, x, 6); |
| 1987 | SkASSERT(result2 == result || |
| 1988 | (result == 1 && result2 == 0)); |
| 1989 | } |
| 1990 | #endif |
| 1991 | |
| 1992 | SkASSERT(result < SK_ARRAY_COUNT(gSweepTable)); |
| 1993 | result = table[result]; |
| 1994 | |
reed@google.com | 61eb040 | 2011-04-15 12:11:12 +0000 | [diff] [blame] | 1995 | if (swap) { |
reed@android.com | 8a1c16f | 2008-12-17 15:59:43 +0000 | [diff] [blame] | 1996 | // complete the atan(v) = PI/2 - atan(1/v) identity |
| 1997 | result = 64 - result; |
| 1998 | // pin to 63 |
| 1999 | result -= result >> 6; |
| 2000 | } |
| 2001 | |
| 2002 | SkASSERT(result <= 63); |
| 2003 | return result; |
| 2004 | } |
| 2005 | |
| 2006 | // returns angle in a circle [0..2PI) -> [0..255] |
reed@google.com | 51baf5a | 2011-09-21 13:38:36 +0000 | [diff] [blame] | 2007 | #ifdef SK_SCALAR_IS_FLOAT |
| 2008 | static unsigned SkATan2_255(float y, float x) { |
| 2009 | // static const float g255Over2PI = 255 / (2 * SK_ScalarPI); |
| 2010 | static const float g255Over2PI = 40.584510488433314f; |
| 2011 | |
| 2012 | float result = sk_float_atan2(y, x); |
| 2013 | if (result < 0) { |
| 2014 | result += 2 * SK_ScalarPI; |
| 2015 | } |
| 2016 | SkASSERT(result >= 0); |
| 2017 | // since our value is always >= 0, we can cast to int, which is faster than |
| 2018 | // calling floorf() |
| 2019 | int ir = (int)(result * g255Over2PI); |
| 2020 | SkASSERT(ir >= 0 && ir <= 255); |
| 2021 | return ir; |
| 2022 | } |
| 2023 | #else |
reed@google.com | 61eb040 | 2011-04-15 12:11:12 +0000 | [diff] [blame] | 2024 | static unsigned SkATan2_255(SkFixed y, SkFixed x) { |
| 2025 | if (x == 0) { |
| 2026 | if (y == 0) { |
reed@android.com | 8a1c16f | 2008-12-17 15:59:43 +0000 | [diff] [blame] | 2027 | return 0; |
reed@google.com | 61eb040 | 2011-04-15 12:11:12 +0000 | [diff] [blame] | 2028 | } |
reed@android.com | 8a1c16f | 2008-12-17 15:59:43 +0000 | [diff] [blame] | 2029 | return y < 0 ? 192 : 64; |
| 2030 | } |
reed@google.com | 61eb040 | 2011-04-15 12:11:12 +0000 | [diff] [blame] | 2031 | if (y == 0) { |
reed@android.com | 8a1c16f | 2008-12-17 15:59:43 +0000 | [diff] [blame] | 2032 | return x < 0 ? 128 : 0; |
reed@google.com | 61eb040 | 2011-04-15 12:11:12 +0000 | [diff] [blame] | 2033 | } |
reed@google.com | 55b8e8c | 2011-01-13 16:22:35 +0000 | [diff] [blame] | 2034 | |
reed@android.com | 8a1c16f | 2008-12-17 15:59:43 +0000 | [diff] [blame] | 2035 | /* Find the right quadrant for x,y |
| 2036 | Since atan_0_90 only handles the first quadrant, we rotate x,y |
| 2037 | appropriately before calling it, and then add the right amount |
| 2038 | to account for the real quadrant. |
| 2039 | quadrant 0 : add 0 | x > 0 && y > 0 |
| 2040 | quadrant 1 : add 64 (90 degrees) | x < 0 && y > 0 |
| 2041 | quadrant 2 : add 128 (180 degrees) | x < 0 && y < 0 |
| 2042 | quadrant 3 : add 192 (270 degrees) | x > 0 && y < 0 |
reed@google.com | 55b8e8c | 2011-01-13 16:22:35 +0000 | [diff] [blame] | 2043 | |
reed@android.com | 8a1c16f | 2008-12-17 15:59:43 +0000 | [diff] [blame] | 2044 | map x<0 to (1 << 6) |
| 2045 | map y<0 to (3 << 6) |
| 2046 | add = map_x ^ map_y |
| 2047 | */ |
| 2048 | int xsign = x >> 31; |
| 2049 | int ysign = y >> 31; |
| 2050 | int add = ((-xsign) ^ (ysign & 3)) << 6; |
| 2051 | |
| 2052 | #ifdef SK_DEBUG |
| 2053 | if (0 == add) |
| 2054 | SkASSERT(x > 0 && y > 0); |
| 2055 | else if (64 == add) |
| 2056 | SkASSERT(x < 0 && y > 0); |
| 2057 | else if (128 == add) |
| 2058 | SkASSERT(x < 0 && y < 0); |
| 2059 | else if (192 == add) |
| 2060 | SkASSERT(x > 0 && y < 0); |
| 2061 | else |
| 2062 | SkASSERT(!"bad value for add"); |
| 2063 | #endif |
reed@google.com | 55b8e8c | 2011-01-13 16:22:35 +0000 | [diff] [blame] | 2064 | |
reed@android.com | 8a1c16f | 2008-12-17 15:59:43 +0000 | [diff] [blame] | 2065 | /* This ^ trick makes x, y positive, and the swap<> handles quadrants |
| 2066 | where we need to rotate x,y by 90 or -90 |
| 2067 | */ |
| 2068 | x = (x ^ xsign) - xsign; |
| 2069 | y = (y ^ ysign) - ysign; |
reed@google.com | 61eb040 | 2011-04-15 12:11:12 +0000 | [diff] [blame] | 2070 | 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] | 2071 | SkTSwap<SkFixed>(x, y); |
reed@google.com | 61eb040 | 2011-04-15 12:11:12 +0000 | [diff] [blame] | 2072 | } |
reed@android.com | 8a1c16f | 2008-12-17 15:59:43 +0000 | [diff] [blame] | 2073 | |
| 2074 | unsigned result = add + atan_0_90(y, x); |
| 2075 | SkASSERT(result < 256); |
| 2076 | return result; |
| 2077 | } |
reed@google.com | 51baf5a | 2011-09-21 13:38:36 +0000 | [diff] [blame] | 2078 | #endif |
reed@android.com | 8a1c16f | 2008-12-17 15:59:43 +0000 | [diff] [blame] | 2079 | |
reed@google.com | dd5bd67 | 2011-09-20 15:56:13 +0000 | [diff] [blame] | 2080 | 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] | 2081 | SkMatrix::MapXYProc proc = fDstToIndexProc; |
| 2082 | const SkMatrix& matrix = fDstToIndex; |
reed@google.com | dd5bd67 | 2011-09-20 15:56:13 +0000 | [diff] [blame] | 2083 | const SkPMColor* SK_RESTRICT cache = this->getCache32(); |
reed@android.com | 8a1c16f | 2008-12-17 15:59:43 +0000 | [diff] [blame] | 2084 | SkPoint srcPt; |
reed@google.com | 55b8e8c | 2011-01-13 16:22:35 +0000 | [diff] [blame] | 2085 | |
reed@google.com | 61eb040 | 2011-04-15 12:11:12 +0000 | [diff] [blame] | 2086 | if (fDstToIndexClass != kPerspective_MatrixClass) { |
reed@android.com | 8a1c16f | 2008-12-17 15:59:43 +0000 | [diff] [blame] | 2087 | proc(matrix, SkIntToScalar(x) + SK_ScalarHalf, |
| 2088 | SkIntToScalar(y) + SK_ScalarHalf, &srcPt); |
reed@google.com | 51baf5a | 2011-09-21 13:38:36 +0000 | [diff] [blame] | 2089 | SkScalar dx, fx = srcPt.fX; |
| 2090 | SkScalar dy, fy = srcPt.fY; |
reed@google.com | 55b8e8c | 2011-01-13 16:22:35 +0000 | [diff] [blame] | 2091 | |
reed@google.com | 61eb040 | 2011-04-15 12:11:12 +0000 | [diff] [blame] | 2092 | if (fDstToIndexClass == kFixedStepInX_MatrixClass) { |
reed@android.com | 8a1c16f | 2008-12-17 15:59:43 +0000 | [diff] [blame] | 2093 | SkFixed storage[2]; |
| 2094 | (void)matrix.fixedStepInX(SkIntToScalar(y) + SK_ScalarHalf, |
| 2095 | &storage[0], &storage[1]); |
reed@google.com | 51baf5a | 2011-09-21 13:38:36 +0000 | [diff] [blame] | 2096 | dx = SkFixedToScalar(storage[0]); |
| 2097 | dy = SkFixedToScalar(storage[1]); |
reed@google.com | 61eb040 | 2011-04-15 12:11:12 +0000 | [diff] [blame] | 2098 | } else { |
reed@android.com | 8a1c16f | 2008-12-17 15:59:43 +0000 | [diff] [blame] | 2099 | SkASSERT(fDstToIndexClass == kLinear_MatrixClass); |
reed@google.com | 51baf5a | 2011-09-21 13:38:36 +0000 | [diff] [blame] | 2100 | dx = matrix.getScaleX(); |
| 2101 | dy = matrix.getSkewY(); |
reed@android.com | 8a1c16f | 2008-12-17 15:59:43 +0000 | [diff] [blame] | 2102 | } |
reed@google.com | 55b8e8c | 2011-01-13 16:22:35 +0000 | [diff] [blame] | 2103 | |
reed@google.com | 61eb040 | 2011-04-15 12:11:12 +0000 | [diff] [blame] | 2104 | for (; count > 0; --count) { |
reed@android.com | 8a1c16f | 2008-12-17 15:59:43 +0000 | [diff] [blame] | 2105 | *dstC++ = cache[SkATan2_255(fy, fx)]; |
| 2106 | fx += dx; |
| 2107 | fy += dy; |
| 2108 | } |
reed@google.com | 61eb040 | 2011-04-15 12:11:12 +0000 | [diff] [blame] | 2109 | } else { // perspective case |
| 2110 | for (int stop = x + count; x < stop; x++) { |
reed@android.com | 8a1c16f | 2008-12-17 15:59:43 +0000 | [diff] [blame] | 2111 | proc(matrix, SkIntToScalar(x) + SK_ScalarHalf, |
reed@google.com | 51baf5a | 2011-09-21 13:38:36 +0000 | [diff] [blame] | 2112 | SkIntToScalar(y) + SK_ScalarHalf, &srcPt); |
| 2113 | *dstC++ = cache[SkATan2_255(srcPt.fY, srcPt.fX)]; |
reed@android.com | 8a1c16f | 2008-12-17 15:59:43 +0000 | [diff] [blame] | 2114 | } |
| 2115 | } |
| 2116 | } |
| 2117 | |
reed@google.com | dd5bd67 | 2011-09-20 15:56:13 +0000 | [diff] [blame] | 2118 | 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] | 2119 | SkMatrix::MapXYProc proc = fDstToIndexProc; |
| 2120 | const SkMatrix& matrix = fDstToIndex; |
reed@google.com | dd5bd67 | 2011-09-20 15:56:13 +0000 | [diff] [blame] | 2121 | const uint16_t* SK_RESTRICT cache = this->getCache16(); |
reed@android.com | 8a1c16f | 2008-12-17 15:59:43 +0000 | [diff] [blame] | 2122 | int toggle = ((x ^ y) & 1) << kCache16Bits; |
| 2123 | SkPoint srcPt; |
| 2124 | |
reed@google.com | 61eb040 | 2011-04-15 12:11:12 +0000 | [diff] [blame] | 2125 | if (fDstToIndexClass != kPerspective_MatrixClass) { |
reed@android.com | 8a1c16f | 2008-12-17 15:59:43 +0000 | [diff] [blame] | 2126 | proc(matrix, SkIntToScalar(x) + SK_ScalarHalf, |
| 2127 | SkIntToScalar(y) + SK_ScalarHalf, &srcPt); |
reed@google.com | 51baf5a | 2011-09-21 13:38:36 +0000 | [diff] [blame] | 2128 | SkScalar dx, fx = srcPt.fX; |
| 2129 | SkScalar dy, fy = srcPt.fY; |
reed@google.com | 55b8e8c | 2011-01-13 16:22:35 +0000 | [diff] [blame] | 2130 | |
reed@google.com | 61eb040 | 2011-04-15 12:11:12 +0000 | [diff] [blame] | 2131 | if (fDstToIndexClass == kFixedStepInX_MatrixClass) { |
reed@android.com | 8a1c16f | 2008-12-17 15:59:43 +0000 | [diff] [blame] | 2132 | SkFixed storage[2]; |
| 2133 | (void)matrix.fixedStepInX(SkIntToScalar(y) + SK_ScalarHalf, |
| 2134 | &storage[0], &storage[1]); |
reed@google.com | 51baf5a | 2011-09-21 13:38:36 +0000 | [diff] [blame] | 2135 | dx = SkFixedToScalar(storage[0]); |
| 2136 | dy = SkFixedToScalar(storage[1]); |
reed@google.com | 61eb040 | 2011-04-15 12:11:12 +0000 | [diff] [blame] | 2137 | } else { |
reed@android.com | 8a1c16f | 2008-12-17 15:59:43 +0000 | [diff] [blame] | 2138 | SkASSERT(fDstToIndexClass == kLinear_MatrixClass); |
reed@google.com | 51baf5a | 2011-09-21 13:38:36 +0000 | [diff] [blame] | 2139 | dx = matrix.getScaleX(); |
| 2140 | dy = matrix.getSkewY(); |
reed@android.com | 8a1c16f | 2008-12-17 15:59:43 +0000 | [diff] [blame] | 2141 | } |
reed@google.com | 55b8e8c | 2011-01-13 16:22:35 +0000 | [diff] [blame] | 2142 | |
reed@google.com | 61eb040 | 2011-04-15 12:11:12 +0000 | [diff] [blame] | 2143 | for (; count > 0; --count) { |
reed@android.com | 8a1c16f | 2008-12-17 15:59:43 +0000 | [diff] [blame] | 2144 | int index = SkATan2_255(fy, fx) >> (8 - kCache16Bits); |
| 2145 | *dstC++ = cache[toggle + index]; |
| 2146 | toggle ^= (1 << kCache16Bits); |
| 2147 | fx += dx; |
| 2148 | fy += dy; |
| 2149 | } |
reed@google.com | 61eb040 | 2011-04-15 12:11:12 +0000 | [diff] [blame] | 2150 | } else { // perspective case |
| 2151 | for (int stop = x + count; x < stop; x++) { |
reed@android.com | 8a1c16f | 2008-12-17 15:59:43 +0000 | [diff] [blame] | 2152 | proc(matrix, SkIntToScalar(x) + SK_ScalarHalf, |
| 2153 | SkIntToScalar(y) + SK_ScalarHalf, &srcPt); |
reed@google.com | 55b8e8c | 2011-01-13 16:22:35 +0000 | [diff] [blame] | 2154 | |
reed@google.com | 51baf5a | 2011-09-21 13:38:36 +0000 | [diff] [blame] | 2155 | int index = SkATan2_255(srcPt.fY, srcPt.fX); |
reed@android.com | 8a1c16f | 2008-12-17 15:59:43 +0000 | [diff] [blame] | 2156 | index >>= (8 - kCache16Bits); |
| 2157 | *dstC++ = cache[toggle + index]; |
| 2158 | toggle ^= (1 << kCache16Bits); |
| 2159 | } |
| 2160 | } |
| 2161 | } |
| 2162 | |
reed@google.com | 61eb040 | 2011-04-15 12:11:12 +0000 | [diff] [blame] | 2163 | /////////////////////////////////////////////////////////////////////////////// |
| 2164 | /////////////////////////////////////////////////////////////////////////////// |
reed@android.com | 8a1c16f | 2008-12-17 15:59:43 +0000 | [diff] [blame] | 2165 | |
| 2166 | // assumes colors is SkColor* and pos is SkScalar* |
| 2167 | #define EXPAND_1_COLOR(count) \ |
| 2168 | SkColor tmp[2]; \ |
| 2169 | do { \ |
| 2170 | if (1 == count) { \ |
| 2171 | tmp[0] = tmp[1] = colors[0]; \ |
| 2172 | colors = tmp; \ |
| 2173 | pos = NULL; \ |
| 2174 | count = 2; \ |
| 2175 | } \ |
| 2176 | } while (0) |
| 2177 | |
reed@google.com | 61eb040 | 2011-04-15 12:11:12 +0000 | [diff] [blame] | 2178 | SkShader* SkGradientShader::CreateLinear(const SkPoint pts[2], |
| 2179 | const SkColor colors[], |
| 2180 | const SkScalar pos[], int colorCount, |
| 2181 | SkShader::TileMode mode, |
| 2182 | SkUnitMapper* mapper) { |
reed@android.com | 8a1c16f | 2008-12-17 15:59:43 +0000 | [diff] [blame] | 2183 | if (NULL == pts || NULL == colors || colorCount < 1) { |
| 2184 | return NULL; |
| 2185 | } |
| 2186 | EXPAND_1_COLOR(colorCount); |
| 2187 | |
reed@android.com | ab840b8 | 2009-07-01 17:00:03 +0000 | [diff] [blame] | 2188 | return SkNEW_ARGS(Linear_Gradient, |
| 2189 | (pts, colors, pos, colorCount, mode, mapper)); |
reed@android.com | 8a1c16f | 2008-12-17 15:59:43 +0000 | [diff] [blame] | 2190 | } |
| 2191 | |
reed@google.com | 61eb040 | 2011-04-15 12:11:12 +0000 | [diff] [blame] | 2192 | SkShader* SkGradientShader::CreateRadial(const SkPoint& center, SkScalar radius, |
| 2193 | const SkColor colors[], |
| 2194 | const SkScalar pos[], int colorCount, |
| 2195 | SkShader::TileMode mode, |
| 2196 | SkUnitMapper* mapper) { |
reed@android.com | 8a1c16f | 2008-12-17 15:59:43 +0000 | [diff] [blame] | 2197 | if (radius <= 0 || NULL == colors || colorCount < 1) { |
| 2198 | return NULL; |
| 2199 | } |
| 2200 | EXPAND_1_COLOR(colorCount); |
| 2201 | |
reed@android.com | ab840b8 | 2009-07-01 17:00:03 +0000 | [diff] [blame] | 2202 | return SkNEW_ARGS(Radial_Gradient, |
| 2203 | (center, radius, colors, pos, colorCount, mode, mapper)); |
reed@android.com | 8a1c16f | 2008-12-17 15:59:43 +0000 | [diff] [blame] | 2204 | } |
| 2205 | |
senorblanco@chromium.org | 7ef071f | 2009-09-22 17:25:29 +0000 | [diff] [blame] | 2206 | SkShader* SkGradientShader::CreateTwoPointRadial(const SkPoint& start, |
| 2207 | SkScalar startRadius, |
| 2208 | const SkPoint& end, |
| 2209 | SkScalar endRadius, |
| 2210 | const SkColor colors[], |
| 2211 | const SkScalar pos[], |
| 2212 | int colorCount, |
| 2213 | SkShader::TileMode mode, |
reed@google.com | 61eb040 | 2011-04-15 12:11:12 +0000 | [diff] [blame] | 2214 | SkUnitMapper* mapper) { |
senorblanco@chromium.org | 7ef071f | 2009-09-22 17:25:29 +0000 | [diff] [blame] | 2215 | if (startRadius < 0 || endRadius < 0 || NULL == colors || colorCount < 1) { |
| 2216 | return NULL; |
| 2217 | } |
| 2218 | EXPAND_1_COLOR(colorCount); |
| 2219 | |
| 2220 | return SkNEW_ARGS(Two_Point_Radial_Gradient, |
reed@google.com | 61eb040 | 2011-04-15 12:11:12 +0000 | [diff] [blame] | 2221 | (start, startRadius, end, endRadius, colors, pos, |
| 2222 | colorCount, mode, mapper)); |
senorblanco@chromium.org | 7ef071f | 2009-09-22 17:25:29 +0000 | [diff] [blame] | 2223 | } |
| 2224 | |
reed@android.com | 8a1c16f | 2008-12-17 15:59:43 +0000 | [diff] [blame] | 2225 | SkShader* SkGradientShader::CreateSweep(SkScalar cx, SkScalar cy, |
| 2226 | const SkColor colors[], |
| 2227 | const SkScalar pos[], |
reed@google.com | 61eb040 | 2011-04-15 12:11:12 +0000 | [diff] [blame] | 2228 | int count, SkUnitMapper* mapper) { |
reed@android.com | 8a1c16f | 2008-12-17 15:59:43 +0000 | [diff] [blame] | 2229 | if (NULL == colors || count < 1) { |
| 2230 | return NULL; |
| 2231 | } |
| 2232 | EXPAND_1_COLOR(count); |
| 2233 | |
| 2234 | return SkNEW_ARGS(Sweep_Gradient, (cx, cy, colors, pos, count, mapper)); |
| 2235 | } |
| 2236 | |
| 2237 | static SkFlattenable::Registrar gLinearGradientReg("Linear_Gradient", |
| 2238 | Linear_Gradient::CreateProc); |
| 2239 | |
| 2240 | static SkFlattenable::Registrar gRadialGradientReg("Radial_Gradient", |
| 2241 | Radial_Gradient::CreateProc); |
| 2242 | |
| 2243 | static SkFlattenable::Registrar gSweepGradientReg("Sweep_Gradient", |
| 2244 | Sweep_Gradient::CreateProc); |
tomhudson@google.com | 938d604 | 2011-04-27 13:57:03 +0000 | [diff] [blame] | 2245 | |
| 2246 | static SkFlattenable::Registrar |
| 2247 | gTwoPointRadialGradientReg("Two_Point_Radial_Gradient", |
| 2248 | Two_Point_Radial_Gradient::CreateProc); |