1 /*
2 * Copyright (C) 2008 Alex Mathews <possessedpenguinbob@gmail.com>
3 * Copyright (C) 2009 Dirk Schulze <krit@webkit.org>
4 * Copyright (C) Research In Motion Limited 2010. All rights reserved.
5 * Copyright (C) 2012 University of Szeged
6 * Copyright (C) 2013 Google Inc. All rights reserved.
7 *
8 * This library is free software; you can redistribute it and/or
9 * modify it under the terms of the GNU Library General Public
10 * License as published by the Free Software Foundation; either
11 * version 2 of the License, or (at your option) any later version.
12 *
13 * This library is distributed in the hope that it will be useful,
14 * but WITHOUT ANY WARRANTY; without even the implied warranty of
15 * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the GNU
16 * Library General Public License for more details.
17 *
18 * You should have received a copy of the GNU Library General Public License
19 * along with this library; see the file COPYING.LIB. If not, write to
20 * the Free Software Foundation, Inc., 51 Franklin Street, Fifth Floor,
21 * Boston, MA 02110-1301, USA.
22 */
23
24 #include "config.h"
25
26 #include "platform/graphics/filters/FilterEffect.h"
27
28 #include "platform/graphics/ImageBuffer.h"
29 #include "platform/graphics/UnacceleratedImageBufferSurface.h"
30 #include "platform/graphics/filters/Filter.h"
31
32 #if HAVE(ARM_NEON_INTRINSICS)
33 #include <arm_neon.h>
34 #endif
35
36 namespace blink {
37
38 static const float kMaxFilterArea = 4096 * 4096;
39
FilterEffect(Filter * filter)40 FilterEffect::FilterEffect(Filter* filter)
41 : m_alphaImage(false)
42 , m_filter(filter)
43 , m_hasX(false)
44 , m_hasY(false)
45 , m_hasWidth(false)
46 , m_hasHeight(false)
47 , m_clipsToBounds(true)
48 , m_operatingColorSpace(ColorSpaceLinearRGB)
49 , m_resultColorSpace(ColorSpaceDeviceRGB)
50 {
51 ASSERT(m_filter);
52 }
53
~FilterEffect()54 FilterEffect::~FilterEffect()
55 {
56 }
57
maxFilterArea()58 float FilterEffect::maxFilterArea()
59 {
60 return kMaxFilterArea;
61 }
62
isFilterSizeValid(const FloatRect & rect)63 bool FilterEffect::isFilterSizeValid(const FloatRect& rect)
64 {
65 if (rect.width() < 0 || rect.height() < 0
66 || (rect.height() * rect.width() > kMaxFilterArea))
67 return false;
68
69 return true;
70 }
71
determineAbsolutePaintRect(const FloatRect & originalRequestedRect)72 FloatRect FilterEffect::determineAbsolutePaintRect(const FloatRect& originalRequestedRect)
73 {
74 FloatRect requestedRect = originalRequestedRect;
75 // Filters in SVG clip to primitive subregion, while CSS doesn't.
76 if (m_clipsToBounds)
77 requestedRect.intersect(maxEffectRect());
78
79 // We may be called multiple times if result is used more than once. Return
80 // quickly if if nothing new is required.
81 if (absolutePaintRect().contains(enclosingIntRect(requestedRect)))
82 return requestedRect;
83
84 FloatRect inputRect = mapPaintRect(requestedRect, false);
85 FloatRect inputUnion;
86 unsigned size = m_inputEffects.size();
87
88 for (unsigned i = 0; i < size; ++i)
89 inputUnion.unite(m_inputEffects.at(i)->determineAbsolutePaintRect(inputRect));
90 inputUnion = mapPaintRect(inputUnion, true);
91
92 if (affectsTransparentPixels() || !size) {
93 inputUnion = requestedRect;
94 } else {
95 // Rect may have inflated. Re-intersect with request.
96 inputUnion.intersect(requestedRect);
97 }
98
99 addAbsolutePaintRect(inputUnion);
100 return inputUnion;
101 }
102
mapRectRecursive(const FloatRect & rect)103 FloatRect FilterEffect::mapRectRecursive(const FloatRect& rect)
104 {
105 FloatRect result;
106 if (m_inputEffects.size() > 0) {
107 result = m_inputEffects.at(0)->mapRectRecursive(rect);
108 for (unsigned i = 1; i < m_inputEffects.size(); ++i)
109 result.unite(m_inputEffects.at(i)->mapRectRecursive(rect));
110 } else
111 result = rect;
112 return mapRect(result);
113 }
114
getSourceRect(const FloatRect & destRect,const FloatRect & destClipRect)115 FloatRect FilterEffect::getSourceRect(const FloatRect& destRect, const FloatRect& destClipRect)
116 {
117 FloatRect sourceRect = mapRect(destRect, false);
118 FloatRect sourceClipRect = mapRect(destClipRect, false);
119
120 FloatRect boundaries = filter()->mapLocalRectToAbsoluteRect(effectBoundaries());
121 if (hasX())
122 sourceClipRect.setX(boundaries.x());
123 if (hasY())
124 sourceClipRect.setY(boundaries.y());
125 if (hasWidth())
126 sourceClipRect.setWidth(boundaries.width());
127 if (hasHeight())
128 sourceClipRect.setHeight(boundaries.height());
129
130 FloatRect result;
131 if (m_inputEffects.size() > 0) {
132 result = m_inputEffects.at(0)->getSourceRect(sourceRect, sourceClipRect);
133 for (unsigned i = 1; i < m_inputEffects.size(); ++i)
134 result.unite(m_inputEffects.at(i)->getSourceRect(sourceRect, sourceClipRect));
135 } else {
136 result = sourceRect;
137 result.intersect(sourceClipRect);
138 }
139 return result;
140 }
141
requestedRegionOfInputImageData(const IntRect & effectRect) const142 IntRect FilterEffect::requestedRegionOfInputImageData(const IntRect& effectRect) const
143 {
144 ASSERT(hasResult());
145 IntPoint location = m_absolutePaintRect.location();
146 location.moveBy(-effectRect.location());
147 return IntRect(location, m_absolutePaintRect.size());
148 }
149
drawingRegionOfInputImage(const IntRect & srcRect) const150 IntRect FilterEffect::drawingRegionOfInputImage(const IntRect& srcRect) const
151 {
152 return IntRect(IntPoint(srcRect.x() - m_absolutePaintRect.x(),
153 srcRect.y() - m_absolutePaintRect.y()), srcRect.size());
154 }
155
inputEffect(unsigned number) const156 FilterEffect* FilterEffect::inputEffect(unsigned number) const
157 {
158 ASSERT_WITH_SECURITY_IMPLICATION(number < m_inputEffects.size());
159 return m_inputEffects.at(number).get();
160 }
161
addAbsolutePaintRect(const FloatRect & paintRect)162 void FilterEffect::addAbsolutePaintRect(const FloatRect& paintRect)
163 {
164 IntRect intPaintRect(enclosingIntRect(paintRect));
165 if (m_absolutePaintRect.contains(intPaintRect))
166 return;
167 intPaintRect.unite(m_absolutePaintRect);
168 // Make sure we are not holding on to a smaller rendering.
169 clearResult();
170 m_absolutePaintRect = intPaintRect;
171 }
172
apply()173 void FilterEffect::apply()
174 {
175 // Recursively determine paint rects first, so that we don't redraw images
176 // if a smaller section is requested first.
177 determineAbsolutePaintRect(maxEffectRect());
178 applyRecursive();
179 }
180
applyRecursive()181 void FilterEffect::applyRecursive()
182 {
183 if (hasResult())
184 return;
185 unsigned size = m_inputEffects.size();
186 for (unsigned i = 0; i < size; ++i) {
187 FilterEffect* in = m_inputEffects.at(i).get();
188 in->applyRecursive();
189 if (!in->hasResult())
190 return;
191
192 // Convert input results to the current effect's color space.
193 transformResultColorSpace(in, i);
194 }
195
196 setResultColorSpace(m_operatingColorSpace);
197
198 if (!isFilterSizeValid(m_absolutePaintRect))
199 return;
200
201 if (!mayProduceInvalidPreMultipliedPixels()) {
202 for (unsigned i = 0; i < size; ++i)
203 inputEffect(i)->correctFilterResultIfNeeded();
204 }
205
206 applySoftware();
207 }
208
forceValidPreMultipliedPixels()209 void FilterEffect::forceValidPreMultipliedPixels()
210 {
211 // Must operate on pre-multiplied results; other formats cannot have invalid pixels.
212 if (!m_premultipliedImageResult)
213 return;
214
215 Uint8ClampedArray* imageArray = m_premultipliedImageResult.get();
216 unsigned char* pixelData = imageArray->data();
217 int pixelArrayLength = imageArray->length();
218
219 // We must have four bytes per pixel, and complete pixels
220 ASSERT(!(pixelArrayLength % 4));
221
222 #if HAVE(ARM_NEON_INTRINSICS)
223 if (pixelArrayLength >= 64) {
224 unsigned char* lastPixel = pixelData + (pixelArrayLength & ~0x3f);
225 do {
226 // Increments pixelData by 64.
227 uint8x16x4_t sixteenPixels = vld4q_u8(pixelData);
228 sixteenPixels.val[0] = vminq_u8(sixteenPixels.val[0], sixteenPixels.val[3]);
229 sixteenPixels.val[1] = vminq_u8(sixteenPixels.val[1], sixteenPixels.val[3]);
230 sixteenPixels.val[2] = vminq_u8(sixteenPixels.val[2], sixteenPixels.val[3]);
231 vst4q_u8(pixelData, sixteenPixels);
232 pixelData += 64;
233 } while (pixelData < lastPixel);
234
235 pixelArrayLength &= 0x3f;
236 if (!pixelArrayLength)
237 return;
238 }
239 #endif
240
241 int numPixels = pixelArrayLength / 4;
242
243 // Iterate over each pixel, checking alpha and adjusting color components if necessary
244 while (--numPixels >= 0) {
245 // Alpha is the 4th byte in a pixel
246 unsigned char a = *(pixelData + 3);
247 // Clamp each component to alpha, and increment the pixel location
248 for (int i = 0; i < 3; ++i) {
249 if (*pixelData > a)
250 *pixelData = a;
251 ++pixelData;
252 }
253 // Increment for alpha
254 ++pixelData;
255 }
256 }
257
clearResult()258 void FilterEffect::clearResult()
259 {
260 if (m_imageBufferResult)
261 m_imageBufferResult.clear();
262 if (m_unmultipliedImageResult)
263 m_unmultipliedImageResult.clear();
264 if (m_premultipliedImageResult)
265 m_premultipliedImageResult.clear();
266
267 m_absolutePaintRect = IntRect();
268 for (int i = 0; i < 4; i++) {
269 m_imageFilters[i] = nullptr;
270 }
271 }
272
clearResultsRecursive()273 void FilterEffect::clearResultsRecursive()
274 {
275 // Clear all results, regardless that the current effect has
276 // a result. Can be used if an effect is in an erroneous state.
277 if (hasResult())
278 clearResult();
279
280 unsigned size = m_inputEffects.size();
281 for (unsigned i = 0; i < size; ++i)
282 m_inputEffects.at(i).get()->clearResultsRecursive();
283 }
284
asImageBuffer()285 ImageBuffer* FilterEffect::asImageBuffer()
286 {
287 if (!hasResult())
288 return 0;
289 if (m_imageBufferResult)
290 return m_imageBufferResult.get();
291 OwnPtr<ImageBufferSurface> surface;
292 surface = adoptPtr(new UnacceleratedImageBufferSurface(m_absolutePaintRect.size()));
293 m_imageBufferResult = ImageBuffer::create(surface.release());
294 if (!m_imageBufferResult)
295 return 0;
296
297 IntRect destinationRect(IntPoint(), m_absolutePaintRect.size());
298 if (m_premultipliedImageResult)
299 m_imageBufferResult->putByteArray(Premultiplied, m_premultipliedImageResult.get(), destinationRect.size(), destinationRect, IntPoint());
300 else
301 m_imageBufferResult->putByteArray(Unmultiplied, m_unmultipliedImageResult.get(), destinationRect.size(), destinationRect, IntPoint());
302 return m_imageBufferResult.get();
303 }
304
asUnmultipliedImage(const IntRect & rect)305 PassRefPtr<Uint8ClampedArray> FilterEffect::asUnmultipliedImage(const IntRect& rect)
306 {
307 ASSERT(isFilterSizeValid(rect));
308 RefPtr<Uint8ClampedArray> imageData = Uint8ClampedArray::createUninitialized(rect.width() * rect.height() * 4);
309 copyUnmultipliedImage(imageData.get(), rect);
310 return imageData.release();
311 }
312
asPremultipliedImage(const IntRect & rect)313 PassRefPtr<Uint8ClampedArray> FilterEffect::asPremultipliedImage(const IntRect& rect)
314 {
315 ASSERT(isFilterSizeValid(rect));
316 RefPtr<Uint8ClampedArray> imageData = Uint8ClampedArray::createUninitialized(rect.width() * rect.height() * 4);
317 copyPremultipliedImage(imageData.get(), rect);
318 return imageData.release();
319 }
320
copyImageBytes(Uint8ClampedArray * source,Uint8ClampedArray * destination,const IntRect & rect)321 inline void FilterEffect::copyImageBytes(Uint8ClampedArray* source, Uint8ClampedArray* destination, const IntRect& rect)
322 {
323 // Initialize the destination to transparent black, if not entirely covered by the source.
324 if (rect.x() < 0 || rect.y() < 0 || rect.maxX() > m_absolutePaintRect.width() || rect.maxY() > m_absolutePaintRect.height())
325 memset(destination->data(), 0, destination->length());
326
327 // Early return if the rect does not intersect with the source.
328 if (rect.maxX() <= 0 || rect.maxY() <= 0 || rect.x() >= m_absolutePaintRect.width() || rect.y() >= m_absolutePaintRect.height())
329 return;
330
331 int xOrigin = rect.x();
332 int xDest = 0;
333 if (xOrigin < 0) {
334 xDest = -xOrigin;
335 xOrigin = 0;
336 }
337 int xEnd = rect.maxX();
338 if (xEnd > m_absolutePaintRect.width())
339 xEnd = m_absolutePaintRect.width();
340
341 int yOrigin = rect.y();
342 int yDest = 0;
343 if (yOrigin < 0) {
344 yDest = -yOrigin;
345 yOrigin = 0;
346 }
347 int yEnd = rect.maxY();
348 if (yEnd > m_absolutePaintRect.height())
349 yEnd = m_absolutePaintRect.height();
350
351 int size = (xEnd - xOrigin) * 4;
352 int destinationScanline = rect.width() * 4;
353 int sourceScanline = m_absolutePaintRect.width() * 4;
354 unsigned char *destinationPixel = destination->data() + ((yDest * rect.width()) + xDest) * 4;
355 unsigned char *sourcePixel = source->data() + ((yOrigin * m_absolutePaintRect.width()) + xOrigin) * 4;
356
357 while (yOrigin < yEnd) {
358 memcpy(destinationPixel, sourcePixel, size);
359 destinationPixel += destinationScanline;
360 sourcePixel += sourceScanline;
361 ++yOrigin;
362 }
363 }
364
copyUnmultipliedImage(Uint8ClampedArray * destination,const IntRect & rect)365 void FilterEffect::copyUnmultipliedImage(Uint8ClampedArray* destination, const IntRect& rect)
366 {
367 ASSERT(hasResult());
368
369 if (!m_unmultipliedImageResult) {
370 // We prefer a conversion from the image buffer.
371 if (m_imageBufferResult)
372 m_unmultipliedImageResult = m_imageBufferResult->getImageData(Unmultiplied, IntRect(IntPoint(), m_absolutePaintRect.size()));
373 else {
374 ASSERT(isFilterSizeValid(m_absolutePaintRect));
375 m_unmultipliedImageResult = Uint8ClampedArray::createUninitialized(m_absolutePaintRect.width() * m_absolutePaintRect.height() * 4);
376 unsigned char* sourceComponent = m_premultipliedImageResult->data();
377 unsigned char* destinationComponent = m_unmultipliedImageResult->data();
378 unsigned char* end = sourceComponent + (m_absolutePaintRect.width() * m_absolutePaintRect.height() * 4);
379 while (sourceComponent < end) {
380 int alpha = sourceComponent[3];
381 if (alpha) {
382 destinationComponent[0] = static_cast<int>(sourceComponent[0]) * 255 / alpha;
383 destinationComponent[1] = static_cast<int>(sourceComponent[1]) * 255 / alpha;
384 destinationComponent[2] = static_cast<int>(sourceComponent[2]) * 255 / alpha;
385 } else {
386 destinationComponent[0] = 0;
387 destinationComponent[1] = 0;
388 destinationComponent[2] = 0;
389 }
390 destinationComponent[3] = alpha;
391 sourceComponent += 4;
392 destinationComponent += 4;
393 }
394 }
395 }
396 copyImageBytes(m_unmultipliedImageResult.get(), destination, rect);
397 }
398
copyPremultipliedImage(Uint8ClampedArray * destination,const IntRect & rect)399 void FilterEffect::copyPremultipliedImage(Uint8ClampedArray* destination, const IntRect& rect)
400 {
401 ASSERT(hasResult());
402
403 if (!m_premultipliedImageResult) {
404 // We prefer a conversion from the image buffer.
405 if (m_imageBufferResult)
406 m_premultipliedImageResult = m_imageBufferResult->getImageData(Premultiplied, IntRect(IntPoint(), m_absolutePaintRect.size()));
407 else {
408 ASSERT(isFilterSizeValid(m_absolutePaintRect));
409 m_premultipliedImageResult = Uint8ClampedArray::createUninitialized(m_absolutePaintRect.width() * m_absolutePaintRect.height() * 4);
410 unsigned char* sourceComponent = m_unmultipliedImageResult->data();
411 unsigned char* destinationComponent = m_premultipliedImageResult->data();
412 unsigned char* end = sourceComponent + (m_absolutePaintRect.width() * m_absolutePaintRect.height() * 4);
413 while (sourceComponent < end) {
414 int alpha = sourceComponent[3];
415 destinationComponent[0] = static_cast<int>(sourceComponent[0]) * alpha / 255;
416 destinationComponent[1] = static_cast<int>(sourceComponent[1]) * alpha / 255;
417 destinationComponent[2] = static_cast<int>(sourceComponent[2]) * alpha / 255;
418 destinationComponent[3] = alpha;
419 sourceComponent += 4;
420 destinationComponent += 4;
421 }
422 }
423 }
424 copyImageBytes(m_premultipliedImageResult.get(), destination, rect);
425 }
426
createImageBufferResult()427 ImageBuffer* FilterEffect::createImageBufferResult()
428 {
429 // Only one result type is allowed.
430 ASSERT(!hasResult());
431 ASSERT(isFilterSizeValid(m_absolutePaintRect));
432
433 OwnPtr<ImageBufferSurface> surface;
434 surface = adoptPtr(new UnacceleratedImageBufferSurface(m_absolutePaintRect.size()));
435 m_imageBufferResult = ImageBuffer::create(surface.release());
436 return m_imageBufferResult.get();
437 }
438
createUnmultipliedImageResult()439 Uint8ClampedArray* FilterEffect::createUnmultipliedImageResult()
440 {
441 // Only one result type is allowed.
442 ASSERT(!hasResult());
443 ASSERT(isFilterSizeValid(m_absolutePaintRect));
444
445 if (m_absolutePaintRect.isEmpty())
446 return 0;
447 m_unmultipliedImageResult = Uint8ClampedArray::createUninitialized(m_absolutePaintRect.width() * m_absolutePaintRect.height() * 4);
448 return m_unmultipliedImageResult.get();
449 }
450
createPremultipliedImageResult()451 Uint8ClampedArray* FilterEffect::createPremultipliedImageResult()
452 {
453 // Only one result type is allowed.
454 ASSERT(!hasResult());
455 ASSERT(isFilterSizeValid(m_absolutePaintRect));
456
457 if (m_absolutePaintRect.isEmpty())
458 return 0;
459 m_premultipliedImageResult = Uint8ClampedArray::createUninitialized(m_absolutePaintRect.width() * m_absolutePaintRect.height() * 4);
460 return m_premultipliedImageResult.get();
461 }
462
adaptColorToOperatingColorSpace(const Color & deviceColor)463 Color FilterEffect::adaptColorToOperatingColorSpace(const Color& deviceColor)
464 {
465 // |deviceColor| is assumed to be DeviceRGB.
466 return ColorSpaceUtilities::convertColor(deviceColor, operatingColorSpace());
467 }
468
transformResultColorSpace(ColorSpace dstColorSpace)469 void FilterEffect::transformResultColorSpace(ColorSpace dstColorSpace)
470 {
471 if (!hasResult() || dstColorSpace == m_resultColorSpace)
472 return;
473
474 // FIXME: We can avoid this potentially unnecessary ImageBuffer conversion by adding
475 // color space transform support for the {pre,un}multiplied arrays.
476 asImageBuffer()->transformColorSpace(m_resultColorSpace, dstColorSpace);
477
478 m_resultColorSpace = dstColorSpace;
479
480 if (m_unmultipliedImageResult)
481 m_unmultipliedImageResult.clear();
482 if (m_premultipliedImageResult)
483 m_premultipliedImageResult.clear();
484 }
485
externalRepresentation(TextStream & ts,int) const486 TextStream& FilterEffect::externalRepresentation(TextStream& ts, int) const
487 {
488 // FIXME: We should dump the subRegions of the filter primitives here later. This isn't
489 // possible at the moment, because we need more detailed informations from the target object.
490 return ts;
491 }
492
determineFilterPrimitiveSubregion(DetermineSubregionFlags flags)493 FloatRect FilterEffect::determineFilterPrimitiveSubregion(DetermineSubregionFlags flags)
494 {
495 Filter* filter = this->filter();
496 ASSERT(filter);
497
498 // FETile, FETurbulence, FEFlood don't have input effects, take the filter region as unite rect.
499 FloatRect subregion;
500 if (unsigned numberOfInputEffects = inputEffects().size()) {
501 subregion = inputEffect(0)->determineFilterPrimitiveSubregion(flags);
502 for (unsigned i = 1; i < numberOfInputEffects; ++i)
503 subregion.unite(inputEffect(i)->determineFilterPrimitiveSubregion(flags));
504 } else {
505 subregion = filter->filterRegion();
506 }
507
508 // After calling determineFilterPrimitiveSubregion on the target effect, reset the subregion again for <feTile>.
509 if (filterEffectType() == FilterEffectTypeTile)
510 subregion = filter->filterRegion();
511
512 if (flags & MapRectForward) {
513 // mapRect works on absolute rectangles.
514 subregion = filter->mapAbsoluteRectToLocalRect(mapRect(
515 filter->mapLocalRectToAbsoluteRect(subregion)));
516 }
517
518 FloatRect boundaries = effectBoundaries();
519 if (hasX())
520 subregion.setX(boundaries.x());
521 if (hasY())
522 subregion.setY(boundaries.y());
523 if (hasWidth())
524 subregion.setWidth(boundaries.width());
525 if (hasHeight())
526 subregion.setHeight(boundaries.height());
527
528 setFilterPrimitiveSubregion(subregion);
529
530 FloatRect absoluteSubregion = filter->mapLocalRectToAbsoluteRect(subregion);
531
532 // Clip every filter effect to the filter region.
533 if (flags & ClipToFilterRegion) {
534 absoluteSubregion.intersect(filter->absoluteFilterRegion());
535 }
536
537 setMaxEffectRect(absoluteSubregion);
538 return subregion;
539 }
540
createImageFilter(SkiaImageFilterBuilder * builder)541 PassRefPtr<SkImageFilter> FilterEffect::createImageFilter(SkiaImageFilterBuilder* builder)
542 {
543 return nullptr;
544 }
545
createImageFilterWithoutValidation(SkiaImageFilterBuilder * builder)546 PassRefPtr<SkImageFilter> FilterEffect::createImageFilterWithoutValidation(SkiaImageFilterBuilder* builder)
547 {
548 return createImageFilter(builder);
549 }
550
getCropRect(const FloatSize & cropOffset) const551 SkImageFilter::CropRect FilterEffect::getCropRect(const FloatSize& cropOffset) const
552 {
553 FloatRect rect = filter()->filterRegion();
554 uint32_t flags = 0;
555 FloatRect boundaries = effectBoundaries();
556 boundaries.move(cropOffset);
557 if (hasX()) {
558 rect.setX(boundaries.x());
559 flags |= SkImageFilter::CropRect::kHasLeft_CropEdge;
560 flags |= SkImageFilter::CropRect::kHasRight_CropEdge;
561 }
562 if (hasY()) {
563 rect.setY(boundaries.y());
564 flags |= SkImageFilter::CropRect::kHasTop_CropEdge;
565 flags |= SkImageFilter::CropRect::kHasBottom_CropEdge;
566 }
567 if (hasWidth()) {
568 rect.setWidth(boundaries.width());
569 flags |= SkImageFilter::CropRect::kHasRight_CropEdge;
570 }
571 if (hasHeight()) {
572 rect.setHeight(boundaries.height());
573 flags |= SkImageFilter::CropRect::kHasBottom_CropEdge;
574 }
575 rect.scale(filter()->absoluteTransform().a(), filter()->absoluteTransform().d());
576 return SkImageFilter::CropRect(rect, flags);
577 }
578
getImageFilterIndex(ColorSpace colorSpace,bool requiresPMColorValidation)579 static int getImageFilterIndex(ColorSpace colorSpace, bool requiresPMColorValidation)
580 {
581 // Map the (colorspace, bool) tuple to an integer index as follows:
582 // 0 == linear colorspace, no PM validation
583 // 1 == device colorspace, no PM validation
584 // 2 == linear colorspace, PM validation
585 // 3 == device colorspace, PM validation
586 return (colorSpace == ColorSpaceLinearRGB ? 0x1 : 0x0) | (requiresPMColorValidation ? 0x2 : 0x0);
587 }
588
getImageFilter(ColorSpace colorSpace,bool requiresPMColorValidation) const589 SkImageFilter* FilterEffect::getImageFilter(ColorSpace colorSpace, bool requiresPMColorValidation) const
590 {
591 int index = getImageFilterIndex(colorSpace, requiresPMColorValidation);
592 return m_imageFilters[index].get();
593 }
594
setImageFilter(ColorSpace colorSpace,bool requiresPMColorValidation,PassRefPtr<SkImageFilter> imageFilter)595 void FilterEffect::setImageFilter(ColorSpace colorSpace, bool requiresPMColorValidation, PassRefPtr<SkImageFilter> imageFilter)
596 {
597 int index = getImageFilterIndex(colorSpace, requiresPMColorValidation);
598 m_imageFilters[index] = imageFilter;
599 }
600
601 } // namespace blink
602