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; }
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; }