bool RenderSVGResourceFilter::applyResource(RenderObject* object, RenderStyle*, GraphicsContext*& context, unsigned short resourceMode)
{
ASSERT(object);
ASSERT(context);
#ifndef NDEBUG
ASSERT(resourceMode == ApplyToDefaultMode);
#else
UNUSED_PARAM(resourceMode);
#endif
// Returning false here, to avoid drawings onto the context. We just want to
// draw the stored filter output, not the unfiltered object as well.
if (m_filter.contains(object)) {
FilterData* filterData = m_filter.get(object);
if (filterData->builded)
return false;
delete m_filter.take(object); // Oops, have to rebuild, go through normal code path
}
OwnPtr<FilterData> filterData(new FilterData);
FloatRect targetBoundingBox = object->objectBoundingBox();
SVGFilterElement* filterElement = static_cast<SVGFilterElement*>(node());
filterData->boundaries = filterElement->filterBoundingBox(targetBoundingBox);
if (filterData->boundaries.isEmpty())
return false;
// Determine absolute transformation matrix for filter.
AffineTransform absoluteTransform;
SVGImageBufferTools::calculateTransformationToOutermostSVGCoordinateSystem(object, absoluteTransform);
if (!absoluteTransform.isInvertible())
return false;
// Eliminate shear of the absolute transformation matrix, to be able to produce unsheared tile images for feTile.
filterData->shearFreeAbsoluteTransform = AffineTransform(absoluteTransform.xScale(), 0, 0, absoluteTransform.yScale(), absoluteTransform.e(), absoluteTransform.f());
// Determine absolute boundaries of the filter and the drawing region.
FloatRect absoluteFilterBoundaries = filterData->shearFreeAbsoluteTransform.mapRect(filterData->boundaries);
FloatRect drawingRegion = object->strokeBoundingBox();
drawingRegion.intersect(filterData->boundaries);
FloatRect absoluteDrawingRegion = filterData->shearFreeAbsoluteTransform.mapRect(drawingRegion);
// Create the SVGFilter object.
bool primitiveBoundingBoxMode = filterElement->primitiveUnits() == SVGUnitTypes::SVG_UNIT_TYPE_OBJECTBOUNDINGBOX;
filterData->filter = SVGFilter::create(filterData->shearFreeAbsoluteTransform, absoluteDrawingRegion, targetBoundingBox, filterData->boundaries, primitiveBoundingBoxMode);
// Create all relevant filter primitives.
filterData->builder = buildPrimitives(filterData->filter.get());
if (!filterData->builder)
return false;
// Calculate the scale factor for the use of filterRes.
// Also see http://www.w3.org/TR/SVG/filters.html#FilterEffectsRegion
FloatSize scale(1, 1);
if (filterElement->hasAttribute(SVGNames::filterResAttr)) {
scale.setWidth(filterElement->filterResX() / absoluteFilterBoundaries.width());
scale.setHeight(filterElement->filterResY() / absoluteFilterBoundaries.height());
}
if (scale.isEmpty())
return false;
// Determine scale factor for filter. The size of intermediate ImageBuffers shouldn't be bigger than kMaxFilterSize.
FloatRect tempSourceRect = absoluteDrawingRegion;
tempSourceRect.scale(scale.width(), scale.height());
fitsInMaximumImageSize(tempSourceRect.size(), scale);
// Set the scale level in SVGFilter.
filterData->filter->setFilterResolution(scale);
FilterEffect* lastEffect = filterData->builder->lastEffect();
if (!lastEffect)
return false;
RenderSVGResourceFilterPrimitive::determineFilterPrimitiveSubregion(lastEffect, filterData->filter.get());
FloatRect subRegion = lastEffect->maxEffectRect();
// At least one FilterEffect has a too big image size,
// recalculate the effect sizes with new scale factors.
if (!fitsInMaximumImageSize(subRegion.size(), scale)) {
filterData->filter->setFilterResolution(scale);
RenderSVGResourceFilterPrimitive::determineFilterPrimitiveSubregion(lastEffect, filterData->filter.get());
}
// If the drawingRegion is empty, we have something like <g filter=".."/>.
// Even if the target objectBoundingBox() is empty, we still have to draw the last effect result image in postApplyResource.
if (drawingRegion.isEmpty()) {
ASSERT(!m_filter.contains(object));
filterData->savedContext = context;
m_filter.set(object, filterData.leakPtr());
return false;
}
absoluteDrawingRegion.scale(scale.width(), scale.height());
OwnPtr<ImageBuffer> sourceGraphic;
if (!SVGImageBufferTools::createImageBuffer(absoluteDrawingRegion, absoluteDrawingRegion, sourceGraphic, ColorSpaceLinearRGB)) {
ASSERT(!m_filter.contains(object));
filterData->savedContext = context;
m_filter.set(object, filterData.leakPtr());
return false;
}
GraphicsContext* sourceGraphicContext = sourceGraphic->context();
ASSERT(sourceGraphicContext);
sourceGraphicContext->translate(-absoluteDrawingRegion.x(), -absoluteDrawingRegion.y());
if (scale.width() != 1 || scale.height() != 1)
sourceGraphicContext->scale(scale);
sourceGraphicContext->concatCTM(filterData->shearFreeAbsoluteTransform);
sourceGraphicContext->clearRect(FloatRect(FloatPoint(), absoluteDrawingRegion.size()));
filterData->sourceGraphicBuffer = sourceGraphic.release();
filterData->savedContext = context;
context = sourceGraphicContext;
ASSERT(!m_filter.contains(object));
m_filter.set(object, filterData.leakPtr());
return true;
}
bool RenderSVGResourceFilter::applyResource(RenderObject* object, RenderStyle*, GraphicsContext*& context, unsigned short resourceMode)
{
ASSERT(object);
ASSERT(context);
#ifndef NDEBUG
ASSERT(resourceMode == ApplyToDefaultMode);
#else
UNUSED_PARAM(resourceMode);
#endif
// Returning false here, to avoid drawings onto the context. We just want to
// draw the stored filter output, not the unfiltered object as well.
if (m_filter.contains(object)) {
FilterData* filterData = m_filter.get(object);
if (filterData->builded)
return false;
delete m_filter.take(object); // Oops, have to rebuild, go through normal code path
}
OwnPtr<FilterData> filterData(new FilterData);
filterData->builder = buildPrimitives();
if (!filterData->builder)
return false;
FloatRect paintRect = object->strokeBoundingBox();
// Calculate the scale factor for the use of filterRes.
// Also see http://www.w3.org/TR/SVG/filters.html#FilterEffectsRegion
SVGFilterElement* filterElement = static_cast<SVGFilterElement*>(node());
filterData->boundaries = filterElement->filterBoundingBox(object->objectBoundingBox());
if (filterData->boundaries.isEmpty())
return false;
FloatSize scale(1.0f, 1.0f);
if (filterElement->hasAttribute(SVGNames::filterResAttr)) {
scale.setWidth(filterElement->filterResX() / filterData->boundaries.width());
scale.setHeight(filterElement->filterResY() / filterData->boundaries.height());
}
if (scale.isEmpty())
return false;
// clip sourceImage to filterRegion
FloatRect clippedSourceRect = paintRect;
clippedSourceRect.intersect(filterData->boundaries);
// scale filter size to filterRes
FloatRect tempSourceRect = clippedSourceRect;
// scale to big sourceImage size to kMaxFilterSize
tempSourceRect.scale(scale.width(), scale.height());
fitsInMaximumImageSize(tempSourceRect.size(), scale);
// prepare Filters
bool primitiveBoundingBoxMode = filterElement->primitiveUnits() == SVGUnitTypes::SVG_UNIT_TYPE_OBJECTBOUNDINGBOX;
filterData->filter = SVGFilter::create(paintRect, filterData->boundaries, primitiveBoundingBoxMode);
filterData->filter->setFilterResolution(scale);
FilterEffect* lastEffect = filterData->builder->lastEffect();
if (!lastEffect)
return false;
lastEffect->calculateEffectRect(filterData->filter.get());
// At least one FilterEffect has a too big image size,
// recalculate the effect sizes with new scale factors.
if (!fitsInMaximumImageSize(filterData->filter->maxImageSize(), scale)) {
filterData->filter->setFilterResolution(scale);
lastEffect->calculateEffectRect(filterData->filter.get());
}
clippedSourceRect.scale(scale.width(), scale.height());
// Draw the content of the current element and it's childs to a imageBuffer to get the SourceGraphic.
// The size of the SourceGraphic is clipped to the size of the filterRegion.
IntRect bufferRect = enclosingIntRect(clippedSourceRect);
OwnPtr<ImageBuffer> sourceGraphic(ImageBuffer::create(bufferRect.size(), LinearRGB));
if (!sourceGraphic.get())
return false;
GraphicsContext* sourceGraphicContext = sourceGraphic->context();
sourceGraphicContext->translate(-clippedSourceRect.x(), -clippedSourceRect.y());
sourceGraphicContext->scale(scale);
sourceGraphicContext->clearRect(FloatRect(FloatPoint(), paintRect.size()));
filterData->sourceGraphicBuffer = sourceGraphic.release();
filterData->savedContext = context;
context = sourceGraphicContext;
ASSERT(!m_filter.contains(object));
m_filter.set(object, filterData.leakPtr());
return true;
}
