bool RenderSVGResourceFilter::prepareEffect(RenderObject* object, GraphicsContext*& context)
{
ASSERT(object);
ASSERT(context);
clearInvalidationMask();
if (m_filter.contains(object)) {
FilterData* filterData = m_filter.get(object);
if (filterData->state == FilterData::PaintingSource)
filterData->state = FilterData::CycleDetected;
return false; // Already built, or we're in a cycle. Regardless, just do nothing more now.
}
OwnPtrWillBeRawPtr<FilterData> filterData = FilterData::create();
FloatRect targetBoundingBox = object->objectBoundingBox();
SVGFilterElement* filterElement = toSVGFilterElement(element());
filterData->boundaries = SVGLengthContext::resolveRectangle<SVGFilterElement>(filterElement, filterElement->filterUnits()->currentValue()->enumValue(), targetBoundingBox);
if (filterData->boundaries.isEmpty())
return false;
// Create the SVGFilter object.
FloatRect drawingRegion = object->strokeBoundingBox();
drawingRegion.intersect(filterData->boundaries);
bool primitiveBoundingBoxMode = filterElement->primitiveUnits()->currentValue()->enumValue() == SVGUnitTypes::SVG_UNIT_TYPE_OBJECTBOUNDINGBOX;
filterData->filter = SVGFilter::create(enclosingIntRect(drawingRegion), targetBoundingBox, filterData->boundaries, primitiveBoundingBoxMode);
// Create all relevant filter primitives.
filterData->builder = buildPrimitives(filterData->filter.get());
if (!filterData->builder)
return false;
FilterEffect* lastEffect = filterData->builder->lastEffect();
if (!lastEffect)
return false;
lastEffect->determineFilterPrimitiveSubregion(ClipToFilterRegion);
FilterData* data = filterData.get();
m_filter.set(object, filterData.release());
beginDeferredFilter(context, data);
return true;
}
bool RenderSVGResourceFilter::applyResource(RenderObject* object, RenderStyle*, GraphicsContext*& context, unsigned short resourceMode)
{
ASSERT(object);
ASSERT(context);
ASSERT_UNUSED(resourceMode, resourceMode == ApplyToDefaultMode);
// 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(adoptPtr(new FilterData));
FloatRect targetBoundingBox = object->objectBoundingBox();
SVGFilterElement* filterElement = static_cast<SVGFilterElement*>(node());
filterData->boundaries = SVGLengthContext::resolveRectangle<SVGFilterElement>(filterElement, filterElement->filterUnits(), 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(), 0, 0);
// 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);
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);
}
// 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;
}
// Change the coordinate transformation applied to the filtered element to reflect the resolution of the filter.
AffineTransform effectiveTransform;
effectiveTransform.scale(scale.width(), scale.height());
effectiveTransform.multiply(filterData->shearFreeAbsoluteTransform);
OwnPtr<ImageBuffer> sourceGraphic;
RenderingMode renderingMode = object->document()->page()->settings()->acceleratedFiltersEnabled() ? Accelerated : Unaccelerated;
if (!SVGImageBufferTools::createImageBuffer(drawingRegion, effectiveTransform, sourceGraphic, ColorSpaceLinearRGB, renderingMode)) {
ASSERT(!m_filter.contains(object));
filterData->savedContext = context;
m_filter.set(object, filterData.leakPtr());
return false;
}
// Set the rendering mode from the page's settings.
filterData->filter->setRenderingMode(renderingMode);
GraphicsContext* sourceGraphicContext = sourceGraphic->context();
ASSERT(sourceGraphicContext);
filterData->sourceGraphicBuffer = sourceGraphic.release();
filterData->savedContext = context;
context = sourceGraphicContext;
ASSERT(!m_filter.contains(object));
m_filter.set(object, filterData.leakPtr());
return true;
}
GraphicsContext* SVGFilterPainter::prepareEffect(const LayoutObject& object, SVGFilterRecordingContext& recordingContext)
{
m_filter.clearInvalidationMask();
if (FilterData* filterData = m_filter.getFilterDataForLayoutObject(&object)) {
// If the filterData already exists we do not need to record the content
// to be filtered. This can occur if the content was previously recorded
// or we are in a cycle.
if (filterData->m_state == FilterData::PaintingFilter)
filterData->m_state = FilterData::PaintingFilterCycleDetected;
if (filterData->m_state == FilterData::RecordingContent)
filterData->m_state = FilterData::RecordingContentCycleDetected;
return nullptr;
}
OwnPtrWillBeRawPtr<FilterData> filterData = FilterData::create();
FloatRect referenceBox = object.objectBoundingBox();
SVGFilterElement* filterElement = toSVGFilterElement(m_filter.element());
FloatRect filterRegion = SVGLengthContext::resolveRectangle<SVGFilterElement>(filterElement, filterElement->filterUnits()->currentValue()->enumValue(), referenceBox);
if (filterRegion.isEmpty())
return nullptr;
// Create the SVGFilter object.
bool primitiveBoundingBoxMode = filterElement->primitiveUnits()->currentValue()->enumValue() == SVGUnitTypes::SVG_UNIT_TYPE_OBJECTBOUNDINGBOX;
Filter::UnitScaling unitScaling = primitiveBoundingBoxMode ? Filter::BoundingBox : Filter::UserSpace;
filterData->filter = Filter::create(referenceBox, filterRegion, 1, unitScaling);
filterData->nodeMap = SVGFilterGraphNodeMap::create();
IntRect sourceRegion = enclosingIntRect(intersection(filterRegion, object.strokeBoundingBox()));
filterData->filter->sourceGraphic()->setSourceRect(sourceRegion);
// Create all relevant filter primitives.
SVGFilterBuilder builder(filterData->filter->sourceGraphic(), filterData->nodeMap.get());
builder.buildGraph(filterData->filter.get(), *filterElement, referenceBox);
FilterEffect* lastEffect = builder.lastEffect();
if (!lastEffect)
return nullptr;
lastEffect->determineFilterPrimitiveSubregion(ClipToFilterRegion);
filterData->filter->setLastEffect(lastEffect);
FilterData* data = filterData.get();
// TODO(pdr): Can this be moved out of painter?
m_filter.setFilterDataForLayoutObject(const_cast<LayoutObject*>(&object), filterData.release());
return recordingContext.beginContent(data);
}
