rileya@google.com | 589708b | 2012-07-26 20:04:23 +0000 | [diff] [blame] | 1 | |
| 2 | /* |
| 3 | * Copyright 2012 Google Inc. |
| 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 | |
| 9 | #include "SkLinearGradient.h" |
| 10 | |
| 11 | static inline int repeat_bits(int x, const int bits) { |
| 12 | return x & ((1 << bits) - 1); |
| 13 | } |
| 14 | |
| 15 | static inline int repeat_8bits(int x) { |
| 16 | return x & 0xFF; |
| 17 | } |
| 18 | |
| 19 | // Visual Studio 2010 (MSC_VER=1600) optimizes bit-shift code incorrectly. |
| 20 | // See http://code.google.com/p/skia/issues/detail?id=472 |
| 21 | #if defined(_MSC_VER) && (_MSC_VER >= 1600) |
| 22 | #pragma optimize("", off) |
| 23 | #endif |
| 24 | |
| 25 | static inline int mirror_bits(int x, const int bits) { |
commit-bot@chromium.org | 38bad32 | 2013-07-30 13:16:29 +0000 | [diff] [blame^] | 26 | if (x & (1 << bits)) { |
rileya@google.com | 589708b | 2012-07-26 20:04:23 +0000 | [diff] [blame] | 27 | x = ~x; |
commit-bot@chromium.org | 38bad32 | 2013-07-30 13:16:29 +0000 | [diff] [blame^] | 28 | } |
rileya@google.com | 589708b | 2012-07-26 20:04:23 +0000 | [diff] [blame] | 29 | return x & ((1 << bits) - 1); |
rileya@google.com | 589708b | 2012-07-26 20:04:23 +0000 | [diff] [blame] | 30 | } |
| 31 | |
| 32 | static inline int mirror_8bits(int x) { |
rileya@google.com | 589708b | 2012-07-26 20:04:23 +0000 | [diff] [blame] | 33 | if (x & 256) { |
| 34 | x = ~x; |
| 35 | } |
| 36 | return x & 255; |
rileya@google.com | 589708b | 2012-07-26 20:04:23 +0000 | [diff] [blame] | 37 | } |
| 38 | |
| 39 | #if defined(_MSC_VER) && (_MSC_VER >= 1600) |
| 40 | #pragma optimize("", on) |
| 41 | #endif |
| 42 | |
| 43 | static void pts_to_unit_matrix(const SkPoint pts[2], SkMatrix* matrix) { |
| 44 | SkVector vec = pts[1] - pts[0]; |
| 45 | SkScalar mag = vec.length(); |
| 46 | SkScalar inv = mag ? SkScalarInvert(mag) : 0; |
| 47 | |
| 48 | vec.scale(inv); |
| 49 | matrix->setSinCos(-vec.fY, vec.fX, pts[0].fX, pts[0].fY); |
| 50 | matrix->postTranslate(-pts[0].fX, -pts[0].fY); |
| 51 | matrix->postScale(inv, inv); |
| 52 | } |
| 53 | |
| 54 | /////////////////////////////////////////////////////////////////////////////// |
| 55 | |
reed@google.com | 437d6eb | 2013-05-23 19:03:05 +0000 | [diff] [blame] | 56 | SkLinearGradient::SkLinearGradient(const SkPoint pts[2], const Descriptor& desc) |
| 57 | : SkGradientShaderBase(desc) |
rileya@google.com | 589708b | 2012-07-26 20:04:23 +0000 | [diff] [blame] | 58 | , fStart(pts[0]) |
| 59 | , fEnd(pts[1]) { |
| 60 | pts_to_unit_matrix(pts, &fPtsToUnit); |
| 61 | } |
| 62 | |
| 63 | SkLinearGradient::SkLinearGradient(SkFlattenableReadBuffer& buffer) |
| 64 | : INHERITED(buffer) |
| 65 | , fStart(buffer.readPoint()) |
| 66 | , fEnd(buffer.readPoint()) { |
| 67 | } |
| 68 | |
| 69 | void SkLinearGradient::flatten(SkFlattenableWriteBuffer& buffer) const { |
| 70 | this->INHERITED::flatten(buffer); |
| 71 | buffer.writePoint(fStart); |
| 72 | buffer.writePoint(fEnd); |
| 73 | } |
| 74 | |
| 75 | bool SkLinearGradient::setContext(const SkBitmap& device, const SkPaint& paint, |
| 76 | const SkMatrix& matrix) { |
| 77 | if (!this->INHERITED::setContext(device, paint, matrix)) { |
| 78 | return false; |
| 79 | } |
| 80 | |
| 81 | unsigned mask = SkMatrix::kTranslate_Mask | SkMatrix::kScale_Mask; |
| 82 | if ((fDstToIndex.getType() & ~mask) == 0) { |
reed@google.com | 6004029 | 2013-02-04 18:21:23 +0000 | [diff] [blame] | 83 | // when we dither, we are (usually) not const-in-Y |
rileya@google.com | 589708b | 2012-07-26 20:04:23 +0000 | [diff] [blame] | 84 | if ((fFlags & SkShader::kHasSpan16_Flag) && !paint.isDither()) { |
| 85 | // only claim this if we do have a 16bit mode (i.e. none of our |
| 86 | // colors have alpha), and if we are not dithering (which obviously |
| 87 | // is not const in Y). |
| 88 | fFlags |= SkShader::kConstInY16_Flag; |
| 89 | } |
| 90 | } |
| 91 | return true; |
| 92 | } |
| 93 | |
| 94 | #define NO_CHECK_ITER \ |
| 95 | do { \ |
| 96 | unsigned fi = fx >> SkGradientShaderBase::kCache32Shift; \ |
| 97 | SkASSERT(fi <= 0xFF); \ |
| 98 | fx += dx; \ |
| 99 | *dstC++ = cache[toggle + fi]; \ |
reed@google.com | 55853db | 2013-02-01 19:34:59 +0000 | [diff] [blame] | 100 | toggle = next_dither_toggle(toggle); \ |
rileya@google.com | 589708b | 2012-07-26 20:04:23 +0000 | [diff] [blame] | 101 | } while (0) |
| 102 | |
| 103 | namespace { |
| 104 | |
| 105 | typedef void (*LinearShadeProc)(TileProc proc, SkFixed dx, SkFixed fx, |
| 106 | SkPMColor* dstC, const SkPMColor* cache, |
| 107 | int toggle, int count); |
| 108 | |
rileya@google.com | 589708b | 2012-07-26 20:04:23 +0000 | [diff] [blame] | 109 | // Linear interpolation (lerp) is unnecessary if there are no sharp |
| 110 | // discontinuities in the gradient - which must be true if there are |
| 111 | // only 2 colors - but it's cheap. |
| 112 | void shadeSpan_linear_vertical_lerp(TileProc proc, SkFixed dx, SkFixed fx, |
| 113 | SkPMColor* SK_RESTRICT dstC, |
| 114 | const SkPMColor* SK_RESTRICT cache, |
| 115 | int toggle, int count) { |
| 116 | // We're a vertical gradient, so no change in a span. |
| 117 | // If colors change sharply across the gradient, dithering is |
| 118 | // insufficient (it subsamples the color space) and we need to lerp. |
| 119 | unsigned fullIndex = proc(fx); |
reed@google.com | 3c2102c | 2013-02-01 12:59:40 +0000 | [diff] [blame] | 120 | unsigned fi = fullIndex >> SkGradientShaderBase::kCache32Shift; |
| 121 | unsigned remainder = fullIndex & ((1 << SkGradientShaderBase::kCache32Shift) - 1); |
skia.committer@gmail.com | 9dde018 | 2013-02-04 12:57:42 +0000 | [diff] [blame] | 122 | |
reed@google.com | 3c2102c | 2013-02-01 12:59:40 +0000 | [diff] [blame] | 123 | int index0 = fi + toggle; |
| 124 | int index1 = index0; |
| 125 | if (fi < SkGradientShaderBase::kCache32Count - 1) { |
| 126 | index1 += 1; |
| 127 | } |
| 128 | SkPMColor lerp = SkFastFourByteInterp(cache[index1], cache[index0], remainder); |
| 129 | index0 ^= SkGradientShaderBase::kDitherStride32; |
| 130 | index1 ^= SkGradientShaderBase::kDitherStride32; |
| 131 | SkPMColor dlerp = SkFastFourByteInterp(cache[index1], cache[index0], remainder); |
rileya@google.com | 589708b | 2012-07-26 20:04:23 +0000 | [diff] [blame] | 132 | sk_memset32_dither(dstC, lerp, dlerp, count); |
| 133 | } |
| 134 | |
| 135 | void shadeSpan_linear_clamp(TileProc proc, SkFixed dx, SkFixed fx, |
| 136 | SkPMColor* SK_RESTRICT dstC, |
| 137 | const SkPMColor* SK_RESTRICT cache, |
| 138 | int toggle, int count) { |
| 139 | SkClampRange range; |
reed@google.com | 3c2102c | 2013-02-01 12:59:40 +0000 | [diff] [blame] | 140 | range.init(fx, dx, count, 0, SkGradientShaderBase::kCache32Count - 1); |
rileya@google.com | 589708b | 2012-07-26 20:04:23 +0000 | [diff] [blame] | 141 | |
| 142 | if ((count = range.fCount0) > 0) { |
| 143 | sk_memset32_dither(dstC, |
| 144 | cache[toggle + range.fV0], |
reed@google.com | 55853db | 2013-02-01 19:34:59 +0000 | [diff] [blame] | 145 | cache[next_dither_toggle(toggle) + range.fV0], |
rileya@google.com | 589708b | 2012-07-26 20:04:23 +0000 | [diff] [blame] | 146 | count); |
| 147 | dstC += count; |
| 148 | } |
| 149 | if ((count = range.fCount1) > 0) { |
| 150 | int unroll = count >> 3; |
| 151 | fx = range.fFx1; |
| 152 | for (int i = 0; i < unroll; i++) { |
| 153 | NO_CHECK_ITER; NO_CHECK_ITER; |
| 154 | NO_CHECK_ITER; NO_CHECK_ITER; |
| 155 | NO_CHECK_ITER; NO_CHECK_ITER; |
| 156 | NO_CHECK_ITER; NO_CHECK_ITER; |
| 157 | } |
| 158 | if ((count &= 7) > 0) { |
| 159 | do { |
| 160 | NO_CHECK_ITER; |
| 161 | } while (--count != 0); |
| 162 | } |
| 163 | } |
| 164 | if ((count = range.fCount2) > 0) { |
| 165 | sk_memset32_dither(dstC, |
| 166 | cache[toggle + range.fV1], |
reed@google.com | 55853db | 2013-02-01 19:34:59 +0000 | [diff] [blame] | 167 | cache[next_dither_toggle(toggle) + range.fV1], |
rileya@google.com | 589708b | 2012-07-26 20:04:23 +0000 | [diff] [blame] | 168 | count); |
| 169 | } |
| 170 | } |
| 171 | |
| 172 | void shadeSpan_linear_mirror(TileProc proc, SkFixed dx, SkFixed fx, |
| 173 | SkPMColor* SK_RESTRICT dstC, |
| 174 | const SkPMColor* SK_RESTRICT cache, |
| 175 | int toggle, int count) { |
| 176 | do { |
| 177 | unsigned fi = mirror_8bits(fx >> 8); |
| 178 | SkASSERT(fi <= 0xFF); |
| 179 | fx += dx; |
| 180 | *dstC++ = cache[toggle + fi]; |
reed@google.com | 55853db | 2013-02-01 19:34:59 +0000 | [diff] [blame] | 181 | toggle = next_dither_toggle(toggle); |
rileya@google.com | 589708b | 2012-07-26 20:04:23 +0000 | [diff] [blame] | 182 | } while (--count != 0); |
| 183 | } |
| 184 | |
| 185 | void shadeSpan_linear_repeat(TileProc proc, SkFixed dx, SkFixed fx, |
| 186 | SkPMColor* SK_RESTRICT dstC, |
| 187 | const SkPMColor* SK_RESTRICT cache, |
| 188 | int toggle, int count) { |
| 189 | do { |
| 190 | unsigned fi = repeat_8bits(fx >> 8); |
| 191 | SkASSERT(fi <= 0xFF); |
| 192 | fx += dx; |
| 193 | *dstC++ = cache[toggle + fi]; |
reed@google.com | 55853db | 2013-02-01 19:34:59 +0000 | [diff] [blame] | 194 | toggle = next_dither_toggle(toggle); |
rileya@google.com | 589708b | 2012-07-26 20:04:23 +0000 | [diff] [blame] | 195 | } while (--count != 0); |
| 196 | } |
| 197 | |
| 198 | } |
| 199 | |
| 200 | void SkLinearGradient::shadeSpan(int x, int y, SkPMColor* SK_RESTRICT dstC, |
| 201 | int count) { |
| 202 | SkASSERT(count > 0); |
| 203 | |
| 204 | SkPoint srcPt; |
| 205 | SkMatrix::MapXYProc dstProc = fDstToIndexProc; |
| 206 | TileProc proc = fTileProc; |
| 207 | const SkPMColor* SK_RESTRICT cache = this->getCache32(); |
reed@google.com | 55853db | 2013-02-01 19:34:59 +0000 | [diff] [blame] | 208 | int toggle = init_dither_toggle(x, y); |
rileya@google.com | 589708b | 2012-07-26 20:04:23 +0000 | [diff] [blame] | 209 | |
| 210 | if (fDstToIndexClass != kPerspective_MatrixClass) { |
| 211 | dstProc(fDstToIndex, SkIntToScalar(x) + SK_ScalarHalf, |
| 212 | SkIntToScalar(y) + SK_ScalarHalf, &srcPt); |
| 213 | SkFixed dx, fx = SkScalarToFixed(srcPt.fX); |
| 214 | |
| 215 | if (fDstToIndexClass == kFixedStepInX_MatrixClass) { |
| 216 | SkFixed dxStorage[1]; |
| 217 | (void)fDstToIndex.fixedStepInX(SkIntToScalar(y), dxStorage, NULL); |
| 218 | dx = dxStorage[0]; |
| 219 | } else { |
| 220 | SkASSERT(fDstToIndexClass == kLinear_MatrixClass); |
| 221 | dx = SkScalarToFixed(fDstToIndex.getScaleX()); |
| 222 | } |
| 223 | |
| 224 | LinearShadeProc shadeProc = shadeSpan_linear_repeat; |
reed@google.com | 53009ba | 2013-02-07 20:28:49 +0000 | [diff] [blame] | 225 | if (0 == dx) { |
rileya@google.com | 589708b | 2012-07-26 20:04:23 +0000 | [diff] [blame] | 226 | shadeProc = shadeSpan_linear_vertical_lerp; |
rileya@google.com | 589708b | 2012-07-26 20:04:23 +0000 | [diff] [blame] | 227 | } else if (SkShader::kClamp_TileMode == fTileMode) { |
| 228 | shadeProc = shadeSpan_linear_clamp; |
| 229 | } else if (SkShader::kMirror_TileMode == fTileMode) { |
| 230 | shadeProc = shadeSpan_linear_mirror; |
| 231 | } else { |
| 232 | SkASSERT(SkShader::kRepeat_TileMode == fTileMode); |
| 233 | } |
| 234 | (*shadeProc)(proc, dx, fx, dstC, cache, toggle, count); |
| 235 | } else { |
| 236 | SkScalar dstX = SkIntToScalar(x); |
| 237 | SkScalar dstY = SkIntToScalar(y); |
| 238 | do { |
| 239 | dstProc(fDstToIndex, dstX, dstY, &srcPt); |
| 240 | unsigned fi = proc(SkScalarToFixed(srcPt.fX)); |
| 241 | SkASSERT(fi <= 0xFFFF); |
| 242 | *dstC++ = cache[toggle + (fi >> kCache32Shift)]; |
reed@google.com | 55853db | 2013-02-01 19:34:59 +0000 | [diff] [blame] | 243 | toggle = next_dither_toggle(toggle); |
rileya@google.com | 589708b | 2012-07-26 20:04:23 +0000 | [diff] [blame] | 244 | dstX += SK_Scalar1; |
| 245 | } while (--count != 0); |
| 246 | } |
| 247 | } |
| 248 | |
| 249 | SkShader::BitmapType SkLinearGradient::asABitmap(SkBitmap* bitmap, |
| 250 | SkMatrix* matrix, |
| 251 | TileMode xy[]) const { |
| 252 | if (bitmap) { |
rileya@google.com | 1c6d64b | 2012-07-27 15:49:05 +0000 | [diff] [blame] | 253 | this->getGradientTableBitmap(bitmap); |
rileya@google.com | 589708b | 2012-07-26 20:04:23 +0000 | [diff] [blame] | 254 | } |
| 255 | if (matrix) { |
| 256 | matrix->preConcat(fPtsToUnit); |
| 257 | } |
| 258 | if (xy) { |
| 259 | xy[0] = fTileMode; |
| 260 | xy[1] = kClamp_TileMode; |
| 261 | } |
| 262 | return kLinear_BitmapType; |
| 263 | } |
| 264 | |
| 265 | SkShader::GradientType SkLinearGradient::asAGradient(GradientInfo* info) const { |
| 266 | if (info) { |
| 267 | commonAsAGradient(info); |
| 268 | info->fPoint[0] = fStart; |
| 269 | info->fPoint[1] = fEnd; |
| 270 | } |
| 271 | return kLinear_GradientType; |
| 272 | } |
| 273 | |
rileya@google.com | 589708b | 2012-07-26 20:04:23 +0000 | [diff] [blame] | 274 | static void dither_memset16(uint16_t dst[], uint16_t value, uint16_t other, |
| 275 | int count) { |
| 276 | if (reinterpret_cast<uintptr_t>(dst) & 2) { |
| 277 | *dst++ = value; |
| 278 | count -= 1; |
| 279 | SkTSwap(value, other); |
| 280 | } |
| 281 | |
| 282 | sk_memset32((uint32_t*)dst, (value << 16) | other, count >> 1); |
| 283 | |
| 284 | if (count & 1) { |
| 285 | dst[count - 1] = value; |
| 286 | } |
| 287 | } |
| 288 | |
| 289 | #define NO_CHECK_ITER_16 \ |
| 290 | do { \ |
| 291 | unsigned fi = fx >> SkGradientShaderBase::kCache16Shift; \ |
| 292 | SkASSERT(fi < SkGradientShaderBase::kCache16Count); \ |
| 293 | fx += dx; \ |
| 294 | *dstC++ = cache[toggle + fi]; \ |
reed@google.com | 55853db | 2013-02-01 19:34:59 +0000 | [diff] [blame] | 295 | toggle = next_dither_toggle16(toggle); \ |
rileya@google.com | 589708b | 2012-07-26 20:04:23 +0000 | [diff] [blame] | 296 | } while (0) |
| 297 | |
| 298 | namespace { |
| 299 | |
| 300 | typedef void (*LinearShade16Proc)(TileProc proc, SkFixed dx, SkFixed fx, |
| 301 | uint16_t* dstC, const uint16_t* cache, |
| 302 | int toggle, int count); |
| 303 | |
| 304 | void shadeSpan16_linear_vertical(TileProc proc, SkFixed dx, SkFixed fx, |
| 305 | uint16_t* SK_RESTRICT dstC, |
| 306 | const uint16_t* SK_RESTRICT cache, |
| 307 | int toggle, int count) { |
| 308 | // we're a vertical gradient, so no change in a span |
| 309 | unsigned fi = proc(fx) >> SkGradientShaderBase::kCache16Shift; |
| 310 | SkASSERT(fi < SkGradientShaderBase::kCache16Count); |
| 311 | dither_memset16(dstC, cache[toggle + fi], |
reed@google.com | 55853db | 2013-02-01 19:34:59 +0000 | [diff] [blame] | 312 | cache[next_dither_toggle16(toggle) + fi], count); |
rileya@google.com | 589708b | 2012-07-26 20:04:23 +0000 | [diff] [blame] | 313 | } |
| 314 | |
| 315 | void shadeSpan16_linear_clamp(TileProc proc, SkFixed dx, SkFixed fx, |
| 316 | uint16_t* SK_RESTRICT dstC, |
| 317 | const uint16_t* SK_RESTRICT cache, |
| 318 | int toggle, int count) { |
| 319 | SkClampRange range; |
reed@google.com | 3c2102c | 2013-02-01 12:59:40 +0000 | [diff] [blame] | 320 | range.init(fx, dx, count, 0, SkGradientShaderBase::kCache32Count - 1); |
rileya@google.com | 589708b | 2012-07-26 20:04:23 +0000 | [diff] [blame] | 321 | |
| 322 | if ((count = range.fCount0) > 0) { |
| 323 | dither_memset16(dstC, |
| 324 | cache[toggle + range.fV0], |
reed@google.com | 55853db | 2013-02-01 19:34:59 +0000 | [diff] [blame] | 325 | cache[next_dither_toggle16(toggle) + range.fV0], |
rileya@google.com | 589708b | 2012-07-26 20:04:23 +0000 | [diff] [blame] | 326 | count); |
| 327 | dstC += count; |
| 328 | } |
| 329 | if ((count = range.fCount1) > 0) { |
| 330 | int unroll = count >> 3; |
| 331 | fx = range.fFx1; |
| 332 | for (int i = 0; i < unroll; i++) { |
| 333 | NO_CHECK_ITER_16; NO_CHECK_ITER_16; |
| 334 | NO_CHECK_ITER_16; NO_CHECK_ITER_16; |
| 335 | NO_CHECK_ITER_16; NO_CHECK_ITER_16; |
| 336 | NO_CHECK_ITER_16; NO_CHECK_ITER_16; |
| 337 | } |
| 338 | if ((count &= 7) > 0) { |
| 339 | do { |
| 340 | NO_CHECK_ITER_16; |
| 341 | } while (--count != 0); |
| 342 | } |
| 343 | } |
| 344 | if ((count = range.fCount2) > 0) { |
| 345 | dither_memset16(dstC, |
| 346 | cache[toggle + range.fV1], |
reed@google.com | 55853db | 2013-02-01 19:34:59 +0000 | [diff] [blame] | 347 | cache[next_dither_toggle16(toggle) + range.fV1], |
rileya@google.com | 589708b | 2012-07-26 20:04:23 +0000 | [diff] [blame] | 348 | count); |
| 349 | } |
| 350 | } |
| 351 | |
| 352 | void shadeSpan16_linear_mirror(TileProc proc, SkFixed dx, SkFixed fx, |
| 353 | uint16_t* SK_RESTRICT dstC, |
| 354 | const uint16_t* SK_RESTRICT cache, |
| 355 | int toggle, int count) { |
| 356 | do { |
| 357 | unsigned fi = mirror_bits(fx >> SkGradientShaderBase::kCache16Shift, |
| 358 | SkGradientShaderBase::kCache16Bits); |
| 359 | SkASSERT(fi < SkGradientShaderBase::kCache16Count); |
| 360 | fx += dx; |
| 361 | *dstC++ = cache[toggle + fi]; |
reed@google.com | 55853db | 2013-02-01 19:34:59 +0000 | [diff] [blame] | 362 | toggle = next_dither_toggle16(toggle); |
rileya@google.com | 589708b | 2012-07-26 20:04:23 +0000 | [diff] [blame] | 363 | } while (--count != 0); |
| 364 | } |
| 365 | |
| 366 | void shadeSpan16_linear_repeat(TileProc proc, SkFixed dx, SkFixed fx, |
| 367 | uint16_t* SK_RESTRICT dstC, |
| 368 | const uint16_t* SK_RESTRICT cache, |
| 369 | int toggle, int count) { |
| 370 | do { |
| 371 | unsigned fi = repeat_bits(fx >> SkGradientShaderBase::kCache16Shift, |
| 372 | SkGradientShaderBase::kCache16Bits); |
| 373 | SkASSERT(fi < SkGradientShaderBase::kCache16Count); |
| 374 | fx += dx; |
| 375 | *dstC++ = cache[toggle + fi]; |
reed@google.com | 55853db | 2013-02-01 19:34:59 +0000 | [diff] [blame] | 376 | toggle = next_dither_toggle16(toggle); |
rileya@google.com | 589708b | 2012-07-26 20:04:23 +0000 | [diff] [blame] | 377 | } while (--count != 0); |
| 378 | } |
| 379 | } |
| 380 | |
| 381 | void SkLinearGradient::shadeSpan16(int x, int y, |
| 382 | uint16_t* SK_RESTRICT dstC, int count) { |
| 383 | SkASSERT(count > 0); |
| 384 | |
| 385 | SkPoint srcPt; |
| 386 | SkMatrix::MapXYProc dstProc = fDstToIndexProc; |
| 387 | TileProc proc = fTileProc; |
| 388 | const uint16_t* SK_RESTRICT cache = this->getCache16(); |
reed@google.com | 55853db | 2013-02-01 19:34:59 +0000 | [diff] [blame] | 389 | int toggle = init_dither_toggle16(x, y); |
rileya@google.com | 589708b | 2012-07-26 20:04:23 +0000 | [diff] [blame] | 390 | |
| 391 | if (fDstToIndexClass != kPerspective_MatrixClass) { |
| 392 | dstProc(fDstToIndex, SkIntToScalar(x) + SK_ScalarHalf, |
| 393 | SkIntToScalar(y) + SK_ScalarHalf, &srcPt); |
| 394 | SkFixed dx, fx = SkScalarToFixed(srcPt.fX); |
| 395 | |
| 396 | if (fDstToIndexClass == kFixedStepInX_MatrixClass) { |
| 397 | SkFixed dxStorage[1]; |
| 398 | (void)fDstToIndex.fixedStepInX(SkIntToScalar(y), dxStorage, NULL); |
| 399 | dx = dxStorage[0]; |
| 400 | } else { |
| 401 | SkASSERT(fDstToIndexClass == kLinear_MatrixClass); |
| 402 | dx = SkScalarToFixed(fDstToIndex.getScaleX()); |
| 403 | } |
| 404 | |
| 405 | LinearShade16Proc shadeProc = shadeSpan16_linear_repeat; |
| 406 | if (SkFixedNearlyZero(dx)) { |
| 407 | shadeProc = shadeSpan16_linear_vertical; |
| 408 | } else if (SkShader::kClamp_TileMode == fTileMode) { |
| 409 | shadeProc = shadeSpan16_linear_clamp; |
| 410 | } else if (SkShader::kMirror_TileMode == fTileMode) { |
| 411 | shadeProc = shadeSpan16_linear_mirror; |
| 412 | } else { |
| 413 | SkASSERT(SkShader::kRepeat_TileMode == fTileMode); |
| 414 | } |
| 415 | (*shadeProc)(proc, dx, fx, dstC, cache, toggle, count); |
| 416 | } else { |
| 417 | SkScalar dstX = SkIntToScalar(x); |
| 418 | SkScalar dstY = SkIntToScalar(y); |
| 419 | do { |
| 420 | dstProc(fDstToIndex, dstX, dstY, &srcPt); |
| 421 | unsigned fi = proc(SkScalarToFixed(srcPt.fX)); |
| 422 | SkASSERT(fi <= 0xFFFF); |
| 423 | |
| 424 | int index = fi >> kCache16Shift; |
| 425 | *dstC++ = cache[toggle + index]; |
reed@google.com | 55853db | 2013-02-01 19:34:59 +0000 | [diff] [blame] | 426 | toggle = next_dither_toggle16(toggle); |
rileya@google.com | 589708b | 2012-07-26 20:04:23 +0000 | [diff] [blame] | 427 | |
| 428 | dstX += SK_Scalar1; |
| 429 | } while (--count != 0); |
| 430 | } |
| 431 | } |
| 432 | |
bsalomon@google.com | cf8fb1f | 2012-08-02 14:03:32 +0000 | [diff] [blame] | 433 | #if SK_SUPPORT_GPU |
| 434 | |
bsalomon@google.com | 2eaaefd | 2012-10-29 19:51:22 +0000 | [diff] [blame] | 435 | #include "GrTBackendEffectFactory.h" |
| 436 | |
rileya@google.com | d7cc651 | 2012-07-27 14:00:39 +0000 | [diff] [blame] | 437 | ///////////////////////////////////////////////////////////////////// |
| 438 | |
bsalomon@google.com | 0707c29 | 2012-10-25 21:45:42 +0000 | [diff] [blame] | 439 | class GrGLLinearGradient : public GrGLGradientEffect { |
rileya@google.com | d7cc651 | 2012-07-27 14:00:39 +0000 | [diff] [blame] | 440 | public: |
| 441 | |
bsalomon@google.com | c781888 | 2013-03-20 19:19:53 +0000 | [diff] [blame] | 442 | GrGLLinearGradient(const GrBackendEffectFactory& factory, const GrDrawEffect&) |
rileya@google.com | d7cc651 | 2012-07-27 14:00:39 +0000 | [diff] [blame] | 443 | : INHERITED (factory) { } |
| 444 | |
| 445 | virtual ~GrGLLinearGradient() { } |
| 446 | |
bsalomon@google.com | f78df33 | 2012-10-29 12:43:38 +0000 | [diff] [blame] | 447 | virtual void emitCode(GrGLShaderBuilder*, |
bsalomon@google.com | c781888 | 2013-03-20 19:19:53 +0000 | [diff] [blame] | 448 | const GrDrawEffect&, |
bsalomon@google.com | f78df33 | 2012-10-29 12:43:38 +0000 | [diff] [blame] | 449 | EffectKey, |
bsalomon@google.com | f78df33 | 2012-10-29 12:43:38 +0000 | [diff] [blame] | 450 | const char* outputColor, |
| 451 | const char* inputColor, |
| 452 | const TextureSamplerArray&) SK_OVERRIDE; |
| 453 | |
bsalomon@google.com | c781888 | 2013-03-20 19:19:53 +0000 | [diff] [blame] | 454 | static EffectKey GenKey(const GrDrawEffect& drawEffect, const GrGLCaps&) { |
| 455 | return GenMatrixKey(drawEffect); |
bsalomon@google.com | d8b5fac | 2012-11-01 17:02:46 +0000 | [diff] [blame] | 456 | } |
rileya@google.com | d7cc651 | 2012-07-27 14:00:39 +0000 | [diff] [blame] | 457 | |
| 458 | private: |
| 459 | |
bsalomon@google.com | 0707c29 | 2012-10-25 21:45:42 +0000 | [diff] [blame] | 460 | typedef GrGLGradientEffect INHERITED; |
rileya@google.com | d7cc651 | 2012-07-27 14:00:39 +0000 | [diff] [blame] | 461 | }; |
| 462 | |
rileya@google.com | 98e8b6d | 2012-07-31 20:38:06 +0000 | [diff] [blame] | 463 | ///////////////////////////////////////////////////////////////////// |
| 464 | |
| 465 | class GrLinearGradient : public GrGradientEffect { |
| 466 | public: |
| 467 | |
bsalomon@google.com | 0ac6af4 | 2013-01-16 15:16:18 +0000 | [diff] [blame] | 468 | static GrEffectRef* Create(GrContext* ctx, |
| 469 | const SkLinearGradient& shader, |
| 470 | const SkMatrix& matrix, |
| 471 | SkShader::TileMode tm) { |
bsalomon@google.com | 6340a41 | 2013-01-22 19:55:59 +0000 | [diff] [blame] | 472 | AutoEffectUnref effect(SkNEW_ARGS(GrLinearGradient, (ctx, shader, matrix, tm))); |
bsalomon@google.com | a1ebbe4 | 2013-01-16 15:51:47 +0000 | [diff] [blame] | 473 | return CreateEffectRef(effect); |
bsalomon@google.com | 0ac6af4 | 2013-01-16 15:16:18 +0000 | [diff] [blame] | 474 | } |
| 475 | |
rileya@google.com | 98e8b6d | 2012-07-31 20:38:06 +0000 | [diff] [blame] | 476 | virtual ~GrLinearGradient() { } |
| 477 | |
| 478 | static const char* Name() { return "Linear Gradient"; } |
bsalomon@google.com | 396e61f | 2012-10-25 19:00:29 +0000 | [diff] [blame] | 479 | const GrBackendEffectFactory& getFactory() const SK_OVERRIDE { |
| 480 | return GrTBackendEffectFactory<GrLinearGradient>::getInstance(); |
rileya@google.com | 98e8b6d | 2012-07-31 20:38:06 +0000 | [diff] [blame] | 481 | } |
| 482 | |
bsalomon@google.com | 422e81a | 2012-10-25 14:11:03 +0000 | [diff] [blame] | 483 | typedef GrGLLinearGradient GLEffect; |
rileya@google.com | 98e8b6d | 2012-07-31 20:38:06 +0000 | [diff] [blame] | 484 | |
| 485 | private: |
bsalomon@google.com | 0ac6af4 | 2013-01-16 15:16:18 +0000 | [diff] [blame] | 486 | GrLinearGradient(GrContext* ctx, |
| 487 | const SkLinearGradient& shader, |
| 488 | const SkMatrix& matrix, |
| 489 | SkShader::TileMode tm) |
| 490 | : INHERITED(ctx, shader, matrix, tm) { } |
bsalomon@google.com | f271cc7 | 2012-10-24 19:35:13 +0000 | [diff] [blame] | 491 | GR_DECLARE_EFFECT_TEST; |
rileya@google.com | 98e8b6d | 2012-07-31 20:38:06 +0000 | [diff] [blame] | 492 | |
| 493 | typedef GrGradientEffect INHERITED; |
| 494 | }; |
| 495 | |
| 496 | ///////////////////////////////////////////////////////////////////// |
| 497 | |
bsalomon@google.com | f271cc7 | 2012-10-24 19:35:13 +0000 | [diff] [blame] | 498 | GR_DEFINE_EFFECT_TEST(GrLinearGradient); |
bsalomon@google.com | d472620 | 2012-08-03 14:34:46 +0000 | [diff] [blame] | 499 | |
bsalomon@google.com | 73a9694 | 2013-02-13 16:31:19 +0000 | [diff] [blame] | 500 | GrEffectRef* GrLinearGradient::TestCreate(SkMWCRandom* random, |
bsalomon@google.com | 0ac6af4 | 2013-01-16 15:16:18 +0000 | [diff] [blame] | 501 | GrContext* context, |
bsalomon@google.com | c26d94f | 2013-03-25 18:19:00 +0000 | [diff] [blame] | 502 | const GrDrawTargetCaps&, |
bsalomon@google.com | 0ac6af4 | 2013-01-16 15:16:18 +0000 | [diff] [blame] | 503 | GrTexture**) { |
bsalomon@google.com | d472620 | 2012-08-03 14:34:46 +0000 | [diff] [blame] | 504 | SkPoint points[] = {{random->nextUScalar1(), random->nextUScalar1()}, |
| 505 | {random->nextUScalar1(), random->nextUScalar1()}}; |
| 506 | |
| 507 | SkColor colors[kMaxRandomGradientColors]; |
| 508 | SkScalar stopsArray[kMaxRandomGradientColors]; |
| 509 | SkScalar* stops = stopsArray; |
| 510 | SkShader::TileMode tm; |
| 511 | int colorCount = RandomGradientParams(random, colors, &stops, &tm); |
| 512 | SkAutoTUnref<SkShader> shader(SkGradientShader::CreateLinear(points, |
| 513 | colors, stops, colorCount, |
| 514 | tm)); |
bsalomon@google.com | e197cbf | 2013-01-14 16:46:26 +0000 | [diff] [blame] | 515 | SkPaint paint; |
| 516 | return shader->asNewEffect(context, paint); |
bsalomon@google.com | d472620 | 2012-08-03 14:34:46 +0000 | [diff] [blame] | 517 | } |
| 518 | |
| 519 | ///////////////////////////////////////////////////////////////////// |
| 520 | |
bsalomon@google.com | f78df33 | 2012-10-29 12:43:38 +0000 | [diff] [blame] | 521 | void GrGLLinearGradient::emitCode(GrGLShaderBuilder* builder, |
bsalomon@google.com | c781888 | 2013-03-20 19:19:53 +0000 | [diff] [blame] | 522 | const GrDrawEffect&, |
bsalomon@google.com | d8b5fac | 2012-11-01 17:02:46 +0000 | [diff] [blame] | 523 | EffectKey key, |
bsalomon@google.com | f78df33 | 2012-10-29 12:43:38 +0000 | [diff] [blame] | 524 | const char* outputColor, |
| 525 | const char* inputColor, |
| 526 | const TextureSamplerArray& samplers) { |
| 527 | this->emitYCoordUniform(builder); |
bsalomon@google.com | d8b5fac | 2012-11-01 17:02:46 +0000 | [diff] [blame] | 528 | const char* coords; |
bsalomon@google.com | c781888 | 2013-03-20 19:19:53 +0000 | [diff] [blame] | 529 | this->setupMatrix(builder, key, &coords); |
rileya@google.com | d7cc651 | 2012-07-27 14:00:39 +0000 | [diff] [blame] | 530 | SkString t; |
bsalomon@google.com | d8b5fac | 2012-11-01 17:02:46 +0000 | [diff] [blame] | 531 | t.append(coords); |
| 532 | t.append(".x"); |
bsalomon@google.com | f06df1b | 2012-09-06 20:22:31 +0000 | [diff] [blame] | 533 | this->emitColorLookup(builder, t.c_str(), outputColor, inputColor, samplers[0]); |
rileya@google.com | d7cc651 | 2012-07-27 14:00:39 +0000 | [diff] [blame] | 534 | } |
| 535 | |
| 536 | ///////////////////////////////////////////////////////////////////// |
| 537 | |
bsalomon@google.com | 0ac6af4 | 2013-01-16 15:16:18 +0000 | [diff] [blame] | 538 | GrEffectRef* SkLinearGradient::asNewEffect(GrContext* context, const SkPaint&) const { |
bsalomon@google.com | 00835cc | 2013-01-14 17:07:22 +0000 | [diff] [blame] | 539 | SkASSERT(NULL != context); |
bsalomon@google.com | dfdb7e5 | 2012-10-16 15:19:45 +0000 | [diff] [blame] | 540 | SkMatrix matrix; |
bsalomon@google.com | f94b3a4 | 2012-10-31 18:09:01 +0000 | [diff] [blame] | 541 | if (!this->getLocalMatrix().invert(&matrix)) { |
humper@google.com | 84831ac | 2013-01-14 22:09:54 +0000 | [diff] [blame] | 542 | return NULL; |
bsalomon@google.com | dfdb7e5 | 2012-10-16 15:19:45 +0000 | [diff] [blame] | 543 | } |
bsalomon@google.com | f94b3a4 | 2012-10-31 18:09:01 +0000 | [diff] [blame] | 544 | matrix.postConcat(fPtsToUnit); |
bsalomon@google.com | 0ac6af4 | 2013-01-16 15:16:18 +0000 | [diff] [blame] | 545 | return GrLinearGradient::Create(context, *this, matrix, fTileMode); |
rileya@google.com | d7cc651 | 2012-07-27 14:00:39 +0000 | [diff] [blame] | 546 | } |
| 547 | |
bsalomon@google.com | cf8fb1f | 2012-08-02 14:03:32 +0000 | [diff] [blame] | 548 | #else |
| 549 | |
bsalomon@google.com | 5d2cd20 | 2013-01-16 15:31:06 +0000 | [diff] [blame] | 550 | GrEffectRef* SkLinearGradient::asNewEffect(GrContext*, const SkPaint&) const { |
bsalomon@google.com | cf8fb1f | 2012-08-02 14:03:32 +0000 | [diff] [blame] | 551 | SkDEBUGFAIL("Should not call in GPU-less build"); |
bsalomon@google.com | e197cbf | 2013-01-14 16:46:26 +0000 | [diff] [blame] | 552 | return NULL; |
bsalomon@google.com | cf8fb1f | 2012-08-02 14:03:32 +0000 | [diff] [blame] | 553 | } |
| 554 | |
| 555 | #endif |
robertphillips@google.com | 76f9e93 | 2013-01-15 20:17:47 +0000 | [diff] [blame] | 556 | |
| 557 | #ifdef SK_DEVELOPER |
| 558 | void SkLinearGradient::toString(SkString* str) const { |
| 559 | str->append("SkLinearGradient ("); |
| 560 | |
| 561 | str->appendf("start: (%f, %f)", fStart.fX, fStart.fY); |
| 562 | str->appendf(" end: (%f, %f) ", fEnd.fX, fEnd.fY); |
| 563 | |
| 564 | this->INHERITED::toString(str); |
| 565 | |
| 566 | str->append(")"); |
| 567 | } |
| 568 | #endif |