FloatRect FilterEffect::getSourceRect(const FloatRect& destRect, const FloatRect& destClipRect)
{
FloatRect sourceRect = mapRect(destRect, false);
FloatRect sourceClipRect = mapRect(destClipRect, false);
FloatRect boundaries = filter()->mapLocalRectToAbsoluteRect(effectBoundaries());
if (hasX())
sourceClipRect.setX(boundaries.x());
if (hasY())
sourceClipRect.setY(boundaries.y());
if (hasWidth())
sourceClipRect.setWidth(boundaries.width());
if (hasHeight())
sourceClipRect.setHeight(boundaries.height());
FloatRect result;
if (m_inputEffects.size() > 0) {
result = m_inputEffects.at(0)->getSourceRect(sourceRect, sourceClipRect);
for (unsigned i = 1; i < m_inputEffects.size(); ++i)
result.unite(m_inputEffects.at(i)->getSourceRect(sourceRect, sourceClipRect));
} else {
result = sourceRect;
result.intersect(sourceClipRect);
}
return result;
}
SkImageFilter::CropRect FilterEffect::getCropRect(const FloatSize& cropOffset) const
{
FloatRect rect = filter()->filterRegion();
uint32_t flags = 0;
FloatRect boundaries = effectBoundaries();
boundaries.move(cropOffset);
if (hasX()) {
rect.setX(boundaries.x());
flags |= SkImageFilter::CropRect::kHasLeft_CropEdge;
flags |= SkImageFilter::CropRect::kHasWidth_CropEdge;
}
if (hasY()) {
rect.setY(boundaries.y());
flags |= SkImageFilter::CropRect::kHasTop_CropEdge;
flags |= SkImageFilter::CropRect::kHasHeight_CropEdge;
}
if (hasWidth()) {
rect.setWidth(boundaries.width());
flags |= SkImageFilter::CropRect::kHasWidth_CropEdge;
}
if (hasHeight()) {
rect.setHeight(boundaries.height());
flags |= SkImageFilter::CropRect::kHasHeight_CropEdge;
}
rect.scale(filter()->absoluteTransform().a(), filter()->absoluteTransform().d());
return SkImageFilter::CropRect(rect, flags);
}
FloatRect FilterEffect::determineFilterPrimitiveSubregion(DetermineSubregionFlags flags)
{
Filter* filter = this->filter();
ASSERT(filter);
// FETile, FETurbulence, FEFlood don't have input effects, take the filter region as unite rect.
FloatRect subregion;
if (unsigned numberOfInputEffects = inputEffects().size()) {
subregion = inputEffect(0)->determineFilterPrimitiveSubregion(flags);
for (unsigned i = 1; i < numberOfInputEffects; ++i)
subregion.unite(inputEffect(i)->determineFilterPrimitiveSubregion(flags));
} else {
subregion = filter->filterRegion();
}
// After calling determineFilterPrimitiveSubregion on the target effect, reset the subregion again for <feTile>.
if (filterEffectType() == FilterEffectTypeTile)
subregion = filter->filterRegion();
if (flags & MapRectForward) {
// mapRect works on absolute rectangles.
subregion = filter->mapAbsoluteRectToLocalRect(mapRect(
filter->mapLocalRectToAbsoluteRect(subregion)));
}
FloatRect boundaries = effectBoundaries();
if (hasX())
subregion.setX(boundaries.x());
if (hasY())
subregion.setY(boundaries.y());
if (hasWidth())
subregion.setWidth(boundaries.width());
if (hasHeight())
subregion.setHeight(boundaries.height());
setFilterPrimitiveSubregion(subregion);
FloatRect absoluteSubregion = filter->mapLocalRectToAbsoluteRect(subregion);
// Clip every filter effect to the filter region.
if (flags & ClipToFilterRegion) {
absoluteSubregion.intersect(filter->absoluteFilterRegion());
}
setMaxEffectRect(absoluteSubregion);
return subregion;
}
FloatRect FilterEffect::determineFilterPrimitiveSubregion()
{
ASSERT(filter());
// FETile, FETurbulence, FEFlood don't have input effects, take the filter region as unite rect.
FloatRect subregion;
if (unsigned numberOfInputEffects = inputEffects().size()) {
subregion = inputEffect(0)->determineFilterPrimitiveSubregion();
for (unsigned i = 1; i < numberOfInputEffects; ++i)
subregion.unite(inputEffect(i)->determineFilterPrimitiveSubregion());
} else
subregion = filter()->filterRegion();
// After calling determineFilterPrimitiveSubregion on the target effect, reset the subregion again for <feTile>.
if (filterEffectType() == FilterEffectTypeTile)
subregion = filter()->filterRegion();
subregion = mapRect(subregion);
FloatRect boundaries = effectBoundaries();
if (hasX())
subregion.setX(boundaries.x());
if (hasY())
subregion.setY(boundaries.y());
if (hasWidth())
subregion.setWidth(boundaries.width());
if (hasHeight())
subregion.setHeight(boundaries.height());
setFilterPrimitiveSubregion(subregion);
FloatRect absoluteSubregion = filter()->absoluteTransform().mapRect(subregion);
FloatSize filterResolution = filter()->filterResolution();
absoluteSubregion.scale(filterResolution.width(), filterResolution.height());
setMaxEffectRect(absoluteSubregion);
return subregion;
}
