[S.P.] Move filter painting to SVGFilterPainter.

Source/core/layout/svg/LayoutSVGResourceFilter.cpp

Index: Source/core/layout/svg/LayoutSVGResourceFilter.cpp
diff --git a/Source/core/layout/svg/LayoutSVGResourceFilter.cpp b/Source/core/layout/svg/LayoutSVGResourceFilter.cpp
index 3b4ca9ebd680df5f57dbb50c558763d423b6a411..af4b67aaadb9d19c28c49882669b336269ef69db 100644
--- a/Source/core/layout/svg/LayoutSVGResourceFilter.cpp
+++ b/Source/core/layout/svg/LayoutSVGResourceFilter.cpp
@@ -27,7 +27,6 @@
 #include "core/dom/ElementTraversal.h"
 #include "core/svg/SVGFilterPrimitiveStandardAttributes.h"
 #include "platform/graphics/GraphicsContext.h"
-#include "platform/graphics/filters/SkiaImageFilterBuilder.h"
 #include "platform/graphics/filters/SourceAlpha.h"
 #include "platform/graphics/filters/SourceGraphic.h"
 #include "third_party/skia/include/core/SkPicture.h"
@@ -104,179 +103,6 @@ PassRefPtrWillBeRawPtr<SVGFilterBuilder> LayoutSVGResourceFilter::buildPrimitive
     return builder.release();
 }
 
-static GraphicsContext* beginRecordingContent(GraphicsContext* context, FilterData* filterData)
-{
-    ASSERT(filterData->m_state == FilterData::Initial);
-
-    // For slimming paint we need to create a new context so the contents of the
-    // filter can be drawn and cached.
-    if (RuntimeEnabledFeatures::slimmingPaintEnabled()) {
-        filterData->m_displayItemList = DisplayItemList::create();
-        filterData->m_context = adoptPtr(new GraphicsContext(nullptr, filterData->m_displayItemList.get()));
-        context = filterData->m_context.get();
-    }
-
-    context->beginRecording(filterData->boundaries);
-    filterData->m_state = FilterData::RecordingContent;
-    return context;
-}
-
-static void endRecordingContent(GraphicsContext* context, FilterData* filterData)
-{
-    ASSERT(filterData->m_state == FilterData::RecordingContent);
-
-    // FIXME: maybe filterData should just hold onto SourceGraphic after creation?
-    SourceGraphic* sourceGraphic = static_cast<SourceGraphic*>(filterData->builder->getEffectById(SourceGraphic::effectName()));
-    ASSERT(sourceGraphic);
-
-    // For slimming paint we need to use the context that contains the filtered
-    // content.
-    if (RuntimeEnabledFeatures::slimmingPaintEnabled()) {
-        ASSERT(filterData->m_displayItemList);
-        ASSERT(filterData->m_context);
-        filterData->m_displayItemList->replay(filterData->m_context.get());
-        context = filterData->m_context.get();
-    }
-
-    sourceGraphic->setPicture(context->endRecording());
-
-    // Content is cached by the source graphic so temporaries can be freed.
-    if (RuntimeEnabledFeatures::slimmingPaintEnabled()) {
-        filterData->m_displayItemList = nullptr;
-        filterData->m_context = nullptr;
-    }
-
-    filterData->m_state = FilterData::ReadyToPaint;
-}
-
-static void paintFilteredContent(GraphicsContext* context, FilterData* filterData, SVGFilterElement* filterElement)
-{
-    ASSERT(filterData->m_state == FilterData::ReadyToPaint);
-    filterData->m_state = FilterData::PaintingFilter;
-
-    SkiaImageFilterBuilder builder(context);
-    SourceGraphic* sourceGraphic = static_cast<SourceGraphic*>(filterData->builder->getEffectById(SourceGraphic::effectName()));
-    ASSERT(sourceGraphic);
-    builder.setSourceGraphic(sourceGraphic);
-    RefPtr<SkImageFilter> imageFilter = builder.build(filterData->builder->lastEffect(), ColorSpaceDeviceRGB);
-    FloatRect boundaries = filterData->boundaries;
-    context->save();
-
-    // Clip drawing of filtered image to the minimum required paint rect.
-    FilterEffect* lastEffect = filterData->builder->lastEffect();
-    context->clipRect(lastEffect->determineAbsolutePaintRect(lastEffect->maxEffectRect()));
-    if (filterElement->hasAttribute(SVGNames::filterResAttr)) {
-        // Get boundaries in device coords.
-        // FIXME: See crbug.com/382491. Is the use of getCTM OK here, given it does not include device
-        // zoom or High DPI adjustments?
-        FloatSize size = context->getCTM().mapSize(boundaries.size());
-        // Compute the scale amount required so that the resulting offscreen is exactly filterResX by filterResY pixels.
-        float filterResScaleX = filterElement->filterResX()->currentValue()->value() / size.width();
-        float filterResScaleY = filterElement->filterResY()->currentValue()->value() / size.height();
-        // Scale the CTM so the primitive is drawn to filterRes.
-        context->scale(filterResScaleX, filterResScaleY);
-        // Create a resize filter with the inverse scale.
-        AffineTransform resizeMatrix;
-        resizeMatrix.scale(1 / filterResScaleX, 1 / filterResScaleY);
-        imageFilter = builder.buildTransform(resizeMatrix, imageFilter.get());
-    }
-
-    // See crbug.com/382491.
-    if (!RuntimeEnabledFeatures::slimmingPaintEnabled()) {
-        // If the CTM contains rotation or shearing, apply the filter to
-        // the unsheared/unrotated matrix, and do the shearing/rotation
-        // as a final pass.
-        AffineTransform ctm = context->getCTM();
-        if (ctm.b() || ctm.c()) {
-            AffineTransform scaleAndTranslate;
-            scaleAndTranslate.translate(ctm.e(), ctm.f());
-            scaleAndTranslate.scale(ctm.xScale(), ctm.yScale());
-            ASSERT(scaleAndTranslate.isInvertible());
-            AffineTransform shearAndRotate = scaleAndTranslate.inverse();
-            shearAndRotate.multiply(ctm);
-            context->setCTM(scaleAndTranslate);
-            imageFilter = builder.buildTransform(shearAndRotate, imageFilter.get());
-        }
-    }
-    context->beginLayer(1, SkXfermode::kSrcOver_Mode, &boundaries, ColorFilterNone, imageFilter.get());
-    context->endLayer();
-    context->restore();
-
-    filterData->m_state = FilterData::ReadyToPaint;
-}
-
-GraphicsContext* LayoutSVGResourceFilter::prepareEffect(LayoutObject* object, GraphicsContext* context)
-{
-    ASSERT(object);
-    ASSERT(context);
-
-    clearInvalidationMask();
-
-    if (FilterData* filterData = m_filter.get(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;
-        return nullptr;
-    }
-
-    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 nullptr;
-
-    // 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 nullptr;
-
-    FilterEffect* lastEffect = filterData->builder->lastEffect();
-    if (!lastEffect)
-        return nullptr;
-
-    lastEffect->determineFilterPrimitiveSubregion(ClipToFilterRegion);
-
-    FilterData* data = filterData.get();
-    m_filter.set(object, filterData.release());
-    return beginRecordingContent(context, data);
-}
-
-void LayoutSVGResourceFilter::finishEffect(LayoutObject* object, GraphicsContext* context)
-{
-    ASSERT(object);
-    ASSERT(context);
-
-    FilterData* filterData = m_filter.get(object);
-    if (!filterData)
-        return;
-
-    // A painting cycle can occur when an FeImage references a source that makes
-    // use of the FeImage itself. This is the first place we would hit the
-    // cycle so we reset the state and continue.
-    if (filterData->m_state == FilterData::PaintingFilterCycleDetected) {
-        filterData->m_state = FilterData::PaintingFilter;
-        return;
-    }
-
-    // Check for RecordingContent here because we may can be re-painting without
-    // re-recording the contents to be filtered.
-    if (filterData->m_state == FilterData::RecordingContent)
-        endRecordingContent(context, filterData);
-
-    if (filterData->m_state == FilterData::ReadyToPaint)
-        paintFilteredContent(context, filterData, toSVGFilterElement(element()));
-}
-
 FloatRect LayoutSVGResourceFilter::resourceBoundingBox(const LayoutObject* object)
 {
     if (SVGFilterElement* element = toSVGFilterElement(this->element()))