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1 /* | 1 /* |
2 * Copyright 2011 Google Inc. | 2 * Copyright 2011 Google Inc. |
3 * | 3 * |
4 * Use of this source code is governed by a BSD-style license that can be | 4 * Use of this source code is governed by a BSD-style license that can be |
5 * found in the LICENSE file. | 5 * found in the LICENSE file. |
6 */ | 6 */ |
7 | 7 |
8 #include "SkColorMatrixFilter.h" | 8 #include "SkColorMatrixFilter.h" |
9 #include "SkColorMatrix.h" | 9 #include "SkColorMatrix.h" |
10 #include "SkColorPriv.h" | 10 #include "SkColorPriv.h" |
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248 * | 248 * |
249 * new_red = old_red * alpha / 255 | 249 * new_red = old_red * alpha / 255 |
250 * | 250 * |
251 * However, 1.0f/255 comes to (in hex) 0x3B808081, which is slightly bigger tha
n the "actual" | 251 * However, 1.0f/255 comes to (in hex) 0x3B808081, which is slightly bigger tha
n the "actual" |
252 * value of 0x3B808080(repeat 80)... This slightly too-big value can cause us t
o compute | 252 * value of 0x3B808080(repeat 80)... This slightly too-big value can cause us t
o compute |
253 * new_red > alpha, which is a problem (for valid premul). To fix this, we use
a | 253 * new_red > alpha, which is a problem (for valid premul). To fix this, we use
a |
254 * hand-computed value of 0x3B808080, 1 ULP smaller. This keeps our colors vali
d. | 254 * hand-computed value of 0x3B808080, 1 ULP smaller. This keeps our colors vali
d. |
255 */ | 255 */ |
256 static const float gInv255 = 0.0039215683f; // (1.0f / 255) - ULP == SkBits2Flo
at(0x3B808080) | 256 static const float gInv255 = 0.0039215683f; // (1.0f / 255) - ULP == SkBits2Flo
at(0x3B808080) |
257 | 257 |
258 static Sk4s premul(const Sk4s& x) { | 258 static Sk4f premul(const Sk4f& x) { |
259 float scale = SkPMFloat(x).a() * gInv255; | 259 float scale = SkPMFloat(x).a() * gInv255; |
260 Sk4s pm = x * Sk4s(scale, scale, scale, 1); | 260 Sk4f pm = x * Sk4f(scale, scale, scale, 1); |
261 | 261 |
262 #ifdef SK_DEBUG | 262 #ifdef SK_DEBUG |
263 SkPMFloat pmf(pm); | 263 SkPMFloat pmf(pm); |
264 SkASSERT(pmf.isValid()); | 264 SkASSERT(pmf.isValid()); |
265 #endif | 265 #endif |
266 | 266 |
267 return pm; | 267 return pm; |
268 } | 268 } |
269 | 269 |
270 static Sk4s unpremul(const SkPMFloat& pm) { | 270 static Sk4f unpremul(const SkPMFloat& pm) { |
271 float scale = 255 / pm.a(); // candidate for fast/approx invert? | 271 float scale = 255 / pm.a(); // candidate for fast/approx invert? |
272 return Sk4s(pm) * Sk4s(scale, scale, scale, 1); | 272 return Sk4f(pm) * Sk4f(scale, scale, scale, 1); |
273 } | 273 } |
274 | 274 |
275 static Sk4f clamp_0_255(const Sk4f& value) { | 275 static Sk4f clamp_0_255(const Sk4f& value) { |
276 return Sk4f::Max(Sk4f::Min(value, Sk4f(255)), Sk4f(0)); | 276 return Sk4f::Max(Sk4f::Min(value, Sk4f(255)), Sk4f(0)); |
277 } | 277 } |
278 | 278 |
279 void SkColorMatrixFilter::filterSpan(const SkPMColor src[], int count, SkPMColor
dst[]) const { | 279 void SkColorMatrixFilter::filterSpan(const SkPMColor src[], int count, SkPMColor
dst[]) const { |
280 Proc proc = fProc; | 280 Proc proc = fProc; |
281 if (NULL == proc) { | 281 if (NULL == proc) { |
282 if (src != dst) { | 282 if (src != dst) { |
283 memcpy(dst, src, count * sizeof(SkPMColor)); | 283 memcpy(dst, src, count * sizeof(SkPMColor)); |
284 } | 284 } |
285 return; | 285 return; |
286 } | 286 } |
287 | 287 |
288 #ifdef SK_SUPPORT_LEGACY_INT_COLORMATRIX | 288 #ifdef SK_SUPPORT_LEGACY_INT_COLORMATRIX |
289 const bool use_floats = false; | 289 const bool use_floats = false; |
290 #else | 290 #else |
291 const bool use_floats = true; | 291 const bool use_floats = true; |
292 #endif | 292 #endif |
293 | 293 |
294 if (use_floats) { | 294 if (use_floats) { |
295 const Sk4s c0 = Sk4s::Load(fTranspose + 0); | 295 const Sk4f c0 = Sk4f::Load(fTranspose + 0); |
296 const Sk4s c1 = Sk4s::Load(fTranspose + 4); | 296 const Sk4f c1 = Sk4f::Load(fTranspose + 4); |
297 const Sk4s c2 = Sk4s::Load(fTranspose + 8); | 297 const Sk4f c2 = Sk4f::Load(fTranspose + 8); |
298 const Sk4s c3 = Sk4s::Load(fTranspose + 12); | 298 const Sk4f c3 = Sk4f::Load(fTranspose + 12); |
299 const Sk4s c4 = Sk4s::Load(fTranspose + 16); // translates | 299 const Sk4f c4 = Sk4f::Load(fTranspose + 16); // translates |
300 | 300 |
301 // todo: we could cache this in the constructor... | 301 // todo: we could cache this in the constructor... |
302 SkPMColor matrix_translate_pmcolor = SkPMFloat(premul(clamp_0_255(c4))).
clamped(); | 302 SkPMColor matrix_translate_pmcolor = SkPMFloat(premul(clamp_0_255(c4))).
clamped(); |
303 | 303 |
304 for (int i = 0; i < count; i++) { | 304 for (int i = 0; i < count; i++) { |
305 const SkPMColor src_c = src[i]; | 305 const SkPMColor src_c = src[i]; |
306 if (0 == src_c) { | 306 if (0 == src_c) { |
307 dst[i] = matrix_translate_pmcolor; | 307 dst[i] = matrix_translate_pmcolor; |
308 continue; | 308 continue; |
309 } | 309 } |
310 | 310 |
311 SkPMFloat srcf(src_c); | 311 SkPMFloat srcf(src_c); |
312 | 312 |
313 if (0xFF != SkGetPackedA32(src_c)) { | 313 if (0xFF != SkGetPackedA32(src_c)) { |
314 srcf = unpremul(srcf); | 314 srcf = unpremul(srcf); |
315 } | 315 } |
316 | 316 |
317 Sk4s r4 = Sk4s(srcf.r()); | 317 Sk4f r4 = Sk4f(srcf.r()); |
318 Sk4s g4 = Sk4s(srcf.g()); | 318 Sk4f g4 = Sk4f(srcf.g()); |
319 Sk4s b4 = Sk4s(srcf.b()); | 319 Sk4f b4 = Sk4f(srcf.b()); |
320 Sk4s a4 = Sk4s(srcf.a()); | 320 Sk4f a4 = Sk4f(srcf.a()); |
321 | 321 |
322 // apply matrix | 322 // apply matrix |
323 Sk4s dst4 = c0 * r4 + c1 * g4 + c2 * b4 + c3 * a4 + c4; | 323 Sk4f dst4 = c0 * r4 + c1 * g4 + c2 * b4 + c3 * a4 + c4; |
324 | 324 |
325 // clamp, re-premul, and write | 325 // clamp, re-premul, and write |
326 dst[i] = SkPMFloat(premul(clamp_0_255(dst4))).get(); | 326 dst[i] = SkPMFloat(premul(clamp_0_255(dst4))).get(); |
327 } | 327 } |
328 } else { | 328 } else { |
329 const State& state = fState; | 329 const State& state = fState; |
330 int32_t result[4]; | 330 int32_t result[4]; |
331 const SkUnPreMultiply::Scale* table = SkUnPreMultiply::GetScaleTable(); | 331 const SkUnPreMultiply::Scale* table = SkUnPreMultiply::GetScaleTable(); |
332 | 332 |
333 for (int i = 0; i < count; i++) { | 333 for (int i = 0; i < count; i++) { |
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577 str->append("matrix: ("); | 577 str->append("matrix: ("); |
578 for (int i = 0; i < 20; ++i) { | 578 for (int i = 0; i < 20; ++i) { |
579 str->appendScalar(fMatrix.fMat[i]); | 579 str->appendScalar(fMatrix.fMat[i]); |
580 if (i < 19) { | 580 if (i < 19) { |
581 str->append(", "); | 581 str->append(", "); |
582 } | 582 } |
583 } | 583 } |
584 str->append(")"); | 584 str->append(")"); |
585 } | 585 } |
586 #endif | 586 #endif |
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