Extract the SVG Filter Reference implementation out of the FilterEffectRenderer into its own type

Source/core/rendering/RenderLayer.cpp

 /*
  * Copyright (C) 2006, 2007, 2008, 2009, 2010, 2011, 2012 Apple Inc. All rights reserved.
  *
  * Portions are Copyright (C) 1998 Netscape Communications Corporation.
  *
  * Other contributors:
  *   Robert O'Callahan <roc+@cs.cmu.edu>
  *   David Baron <dbaron@fas.harvard.edu>
  *   Christian Biesinger <cbiesinger@web.de>
  *   Randall Jesup <rjesup@wgate.com>
@@ skipping 58 matching lines @@
 #include "core/platform/HistogramSupport.h"
 #include "core/platform/PlatformGestureEvent.h"
 #include "core/platform/PlatformMouseEvent.h"
 #include "core/platform/ScrollAnimator.h"
 #include "core/platform/Scrollbar.h"
 #include "core/platform/ScrollbarTheme.h"
 #include "core/platform/chromium/TraceEvent.h"
 #include "core/platform/graphics/FloatPoint3D.h"
 #include "core/platform/graphics/FloatRect.h"
 #include "core/platform/graphics/GraphicsContextStateSaver.h"
+#include "core/platform/graphics/filters/ReferenceFilter.h"
+#include "core/platform/graphics/filters/SourceGraphic.h"
 #include "core/platform/graphics/filters/custom/CustomFilterGlobalContext.h"
 #include "core/platform/graphics/filters/custom/CustomFilterOperation.h"
 #include "core/platform/graphics/filters/custom/CustomFilterValidatedProgram.h"
 #include "core/platform/graphics/filters/custom/ValidatedCustomFilterOperation.h"
 #include "core/platform/graphics/transforms/ScaleTransformOperation.h"
 #include "core/platform/graphics/transforms/TransformationMatrix.h"
 #include "core/platform/graphics/transforms/TranslateTransformOperation.h"
 #include "core/rendering/ColumnInfo.h"
 #include "core/rendering/FilterEffectRenderer.h"
 #include "core/rendering/HitTestRequest.h"
 #include "core/rendering/HitTestResult.h"
 #include "core/rendering/HitTestingTransformState.h"
 #include "core/rendering/OverlapTestRequestClient.h"
 #include "core/rendering/RenderArena.h"
 #include "core/rendering/RenderFlowThread.h"
 #include "core/rendering/RenderGeometryMap.h"
 #include "core/rendering/RenderInline.h"
 #include "core/rendering/RenderLayerBacking.h"
 #include "core/rendering/RenderLayerCompositor.h"
 #include "core/rendering/RenderReplica.h"
 #include "core/rendering/RenderScrollbar.h"
 #include "core/rendering/RenderScrollbarPart.h"
 #include "core/rendering/RenderTreeAsText.h"
 #include "core/rendering/RenderView.h"
+#include "core/rendering/svg/ReferenceFilterBuilder.h"
 #include "core/rendering/svg/RenderSVGResourceClipper.h"
 #include <wtf/MemoryInstrumentationVector.h>
 #include <wtf/StdLibExtras.h>
 #include <wtf/text/CString.h>
 #include <wtf/UnusedParam.h>
 
 #define MIN_INTERSECT_FOR_REVEAL 32
 
 using namespace std;
 
@@ skipping 5926 matching lines @@
     if (!hasOrHadFilters(oldStyle, newStyle))
         return;
 
     updateOrRemoveFilterClients();
     // During an accelerated animation, both WebKit and the compositor animate properties.
     // However, WebKit shouldn't ask the compositor to update its filters if the compositor is performing the animation.
     bool shouldUpdateFilters = isComposited() && !renderer()->animation()->isRunningAcceleratedAnimationOnRenderer(renderer(), CSSPropertyWebkitFilter);
     if (shouldUpdateFilters)
         backing()->updateFilters(renderer()->style());
     updateOrRemoveFilterEffectRenderer();
-    // FIXME: Accelerated SVG reference filters still rely on FilterEffectRenderer to build the filter graph.
-    // Thus, we have to call updateFilters again, after we have a FilterEffectRenderer.
-    // FilterEffectRenderer is intended to render software filters and shouldn't be needed for accelerated filters.
-    // We should extract the SVG graph building functionality out of FilterEffectRenderer, and it should happen in RenderLayer::computeFilterOperations.
-    // https://bugs.webkit.org/show_bug.cgi?id=114051
-    if (shouldUpdateFilters && newStyle->filter().hasReferenceFilter())
-        backing()->updateFilters(renderer()->style());
 }
 
 void RenderLayer::styleChanged(StyleDifference, const RenderStyle* oldStyle)
 {
     updateIsNormalFlowOnly();
 
     updateResizerAreaSet();
     updateScrollbarsAfterStyleChange(oldStyle);
     updateStackingContextsAfterStyleChange(oldStyle);
     updateVisibilityAfterStyleChange(oldStyle);
@@ skipping 172 matching lines @@
 bool RenderLayer::isCSSCustomFilterEnabled() const
 {
     // We only want to enable shaders if WebGL is also enabled on this platform.
     const Settings* settings = renderer()->document()->settings();
     return settings && settings->isCSSCustomFilterEnabled() && settings->webGLEnabled();
 }
 
 FilterOperations RenderLayer::computeFilterOperations(const RenderStyle* style)
 {
     const FilterOperations& filters = style->filter();
+    if (filters.hasReferenceFilter()) {
+        for (size_t i = 0; i < filters.size(); ++i) {
+            FilterOperation* filterOperation = filters.operations().at(i).get();
+            if (filterOperation->getOperationType() != FilterOperation::REFERENCE)
+                continue;
+            ReferenceFilterOperation* referenceOperation = static_cast<ReferenceFilterOperation*>(filterOperation);
+            // FIXME: Cache the ReferenceFilter if it didn't change.
+            RefPtr<ReferenceFilter> referenceFilter = ReferenceFilter::create();
+            float zoom = style->effectiveZoom();
+            referenceFilter->setFilterResolution(FloatSize(zoom, zoom));
+            referenceFilter->setLastEffect(ReferenceFilterBuilder::build(referenceFilter.get(), renderer(), referenceFilter->sourceGraphic(),
+                referenceOperation));
+            referenceOperation->setFilter(referenceFilter.release());
+        }
+    }
+
     if (!filters.hasCustomFilter())
         return filters;
 
     if (!isCSSCustomFilterEnabled()) {
         // CSS Custom filters should not parse at all in this case, but there might be
         // remaining styles that were parsed when the flag was enabled. Reproduces in DumpRenderTree
         // because it resets the flag while the previous test is still loaded.
         return FilterOperations();
     }
 
@@ skipping 45 matching lines @@
 {
     // FilterEffectRenderer is only used to render the filters in software mode,
     // so we always need to run updateOrRemoveFilterEffectRenderer after the composited
     // mode might have changed for this layer.
     if (!paintsWithFilters()) {
         // Don't delete the whole filter info here, because we might use it
         // for loading CSS shader files.
         if (RenderLayerFilterInfo* filterInfo = this->filterInfo())
             filterInfo->setRenderer(0);
 
-        // FIXME: Accelerated SVG reference filters shouldn't rely on FilterEffectRenderer to build the filter graph.
-        // https://bugs.webkit.org/show_bug.cgi?id=114051
-
-        // Early-return only if we *don't* have reference filters.
-        // For reference filters, we still want the FilterEffect graph built
-        // for us, even if we're composited.
-        if (!renderer()->style()->filter().hasReferenceFilter())
-            return;
+        return;
     }
     
     RenderLayerFilterInfo* filterInfo = ensureFilterInfo();
     if (!filterInfo->renderer()) {
         RefPtr<FilterEffectRenderer> filterRenderer = FilterEffectRenderer::create();
         RenderingMode renderingMode = renderer()->frame()->page()->settings()->acceleratedFiltersEnabled() ? Accelerated : Unaccelerated;
         filterRenderer->setRenderingMode(renderingMode);
         filterInfo->setRenderer(filterRenderer.release());
         
         // We can optimize away code paths in other places if we know that there are no software filters.
@@ skipping 51 matching lines @@
     }
 }
 
 void showLayerTree(const WebCore::RenderObject* renderer)
 {
     if (!renderer)
         return;
     showLayerTree(renderer->enclosingLayer());
 }
 #endif