Factor painting code for filters out of FilterEffectRenderer into FilterPainter.

Source/core/paint/LayerPainter.cpp

 // Copyright 2014 The Chromium Authors. All rights reserved.
 // Use of this source code is governed by a BSD-style license that can be
 // found in the LICENSE file.
 
 #include "config.h"
 #include "core/paint/LayerPainter.h"
 
 #include "core/frame/Settings.h"
 #include "core/page/Page.h"
+#include "core/paint/FilterPainter.h"
 #include "core/rendering/ClipPathOperation.h"
 #include "core/rendering/FilterEffectRenderer.h"
 #include "core/rendering/PaintInfo.h"
 #include "core/rendering/RenderBlock.h"
 #include "core/rendering/RenderLayer.h"
 #include "core/rendering/RenderView.h"
 #include "core/rendering/svg/RenderSVGResourceClipper.h"
 
 namespace blink {
 
@@ skipping 75 matching lines @@
         if (m_renderLayer.parent()) {
             ClipRectsContext clipRectsContext(paintingInfo.rootLayer, (paintFlags & PaintLayerUncachedClipRects) ? UncachedClipRects : PaintingClipRects, IgnoreOverlayScrollbarSize);
             if (shouldRespectOverflowClip(paintFlags, m_renderLayer.renderer()) == IgnoreOverflowClip)
                 clipRectsContext.setIgnoreOverflowClip();
             clipRect = m_renderLayer.clipper().backgroundClipRect(clipRectsContext);
             clipRect.intersect(paintingInfo.paintDirtyRect);
 
             if (needsToClip(paintingInfo, clipRect)) {
                 clipRecorder = adoptPtr(new ClipRecorder(m_renderLayer.parent(), context, DisplayItem::ClipLayerParent, clipRect));
                 if (clipRect.hasRadius())
-                    LayerPainter(*m_renderLayer.parent()).applyRoundedRectClips(paintingInfo, context, paintFlags, *clipRecorder);
+                    applyRoundedRectClips(*m_renderLayer.parent(), paintingInfo, context, paintFlags, *clipRecorder);
             }
         }
 
         paintLayerByApplyingTransform(context, paintingInfo, paintFlags);
 
         return;
     }
 
     paintLayerContentsAndReflection(context, paintingInfo, paintFlags);
 }
@@ skipping 130 matching lines @@
     }
 
     // Blending operations must be performed only with the nearest ancestor stacking context.
     // Note that there is no need to create a transparency layer if we're painting the root.
     bool createTransparencyLayerForBlendMode = !m_renderLayer.renderer()->isDocumentElement() && m_renderLayer.stackingNode()->isStackingContext() && m_renderLayer.hasNonIsolatedDescendantWithBlendMode();
 
     if (createTransparencyLayerForBlendMode)
         beginTransparencyLayers(context, paintingInfo.rootLayer, paintingInfo.paintDirtyRect, paintingInfo.subPixelAccumulation, paintingInfo.paintBehavior);
 
     LayerPaintingInfo localPaintingInfo(paintingInfo);
-    bool haveFilterEffect = m_renderLayer.filterRenderer() && m_renderLayer.paintsWithFilters();
 
     LayerFragments layerFragments;
     if (shouldPaintContent || shouldPaintOutline || isPaintingOverlayScrollbars) {
         // Collect the fragments. This will compute the clip rectangles and paint offsets for each layer fragment.
         m_renderLayer.collectFragments(layerFragments, localPaintingInfo.rootLayer, localPaintingInfo.paintDirtyRect,
             (paintFlags & PaintLayerUncachedClipRects) ? UncachedClipRects : PaintingClipRects, IgnoreOverlayScrollbarSize,
             shouldRespectOverflowClip(paintFlags, m_renderLayer.renderer()), &offsetFromRoot, localPaintingInfo.subPixelAccumulation);
         if (shouldPaintContent)
             shouldPaintContent = atLeastOneFragmentIntersectsDamageRect(layerFragments, localPaintingInfo, paintFlags, offsetFromRoot);
     }
 
     bool selectionOnly  = localPaintingInfo.paintBehavior & PaintBehaviorSelectionOnly;
     // If this layer's renderer is a child of the paintingRoot, we render unconditionally, which
     // is done by passing a nil paintingRoot down to our renderer (as if no paintingRoot was ever set).
     // Else, our renderer tree may or may not contain the painting root, so we pass that root along
     // so it will be tested against as we descend through the renderers.
     RenderObject* paintingRootForRenderer = 0;
     if (localPaintingInfo.paintingRoot && !m_renderLayer.renderer()->isDescendantOf(localPaintingInfo.paintingRoot))
         paintingRootForRenderer = localPaintingInfo.paintingRoot;
 
-    { // Begin block for the lifetime of any filter clip.
-        OwnPtr<ClipRecorder> clipRecorder;
-        if (haveFilterEffect) {
+    { // Begin block for the lifetime of any filter.
+        OwnPtr<FilterPainter> filterPainter;
+        if (m_renderLayer.filterRenderer() && m_renderLayer.paintsWithFilters()) {
             ASSERT(m_renderLayer.filterInfo());
 
             if (!rootRelativeBoundsComputed)
                 rootRelativeBounds = m_renderLayer.physicalBoundingBoxIncludingReflectionAndStackingChildren(paintingInfo.rootLayer, offsetFromRoot);
 
             // Do transparency and clipping before starting filter processing.
             if (haveTransparency) {
                 // If we have a filter and transparency, we have to eagerly start a transparency layer here, rather than risk a child layer lazily starts one after filter processing.
                 beginTransparencyLayers(context, localPaintingInfo.rootLayer, paintingInfo.paintDirtyRect, paintingInfo.subPixelAccumulation, localPaintingInfo.paintBehavior);
             }
 
             // We'll handle clipping to the dirty rect before filter rasterization.
             // Filter processing will automatically expand the clip rect and the offscreen to accommodate any filter outsets.
             // FIXME: It is incorrect to just clip to the damageRect here once multiple fragments are involved.
             ClipRect backgroundRect = layerFragments.isEmpty() ? ClipRect() : layerFragments[0].backgroundRect;
 
-            if (needsToClip(localPaintingInfo, backgroundRect)) {
-                clipRecorder = adoptPtr(new ClipRecorder(&m_renderLayer, context, DisplayItem::ClipLayerFilter, backgroundRect));
-                if (backgroundRect.hasRadius())
-                    applyRoundedRectClips(localPaintingInfo, context, paintFlags, *clipRecorder);
-            }
-
             // Subsequent code should not clip to the dirty rect, since we've already
             // done it above, and doing it later will defeat the outsets.
             localPaintingInfo.clipToDirtyRect = false;
-            haveFilterEffect = m_renderLayer.filterRenderer()->beginFilterEffect(context, rootRelativeBounds);
-            if (!haveFilterEffect) {
-                // If the the filter failed to start, undo the clip immediately
-                clipRecorder.clear();
-            }
+            filterPainter = adoptPtr(new FilterPainter(m_renderLayer, context, rootRelativeBounds, backgroundRect, localPaintingInfo, paintFlags));
         }
 
         ASSERT(!(localPaintingInfo.paintBehavior & PaintBehaviorForceBlackText));
 
         bool shouldPaintBackground = isPaintingCompositedBackground && shouldPaintContent && !selectionOnly;
         bool shouldPaintNegZOrderList = (isPaintingScrollingContent && isPaintingOverflowContents) || (!isPaintingScrollingContent && isPaintingCompositedBackground);
         bool shouldPaintOwnContents = isPaintingCompositedForeground && shouldPaintContent;
         bool shouldPaintNormalFlowAndPosZOrderLists = isPaintingCompositedForeground;
         bool shouldPaintOverlayScrollbars = isPaintingOverlayScrollbars;
 
@@ skipping 17 matching lines @@
         }
 
         if (shouldPaintOutline)
             paintOutlineForFragments(layerFragments, context, localPaintingInfo, paintBehavior, paintingRootForRenderer, paintFlags);
 
         if (shouldPaintNormalFlowAndPosZOrderLists)
             paintChildren(NormalFlowChildren | PositiveZOrderChildren, context, paintingInfo, paintFlags);
 
         if (shouldPaintOverlayScrollbars)
             paintOverflowControlsForFragments(layerFragments, context, localPaintingInfo, paintFlags);
-
-        if (haveFilterEffect) {
-            // Apply the correct clipping (ie. overflow: hidden).
-            // FIXME: It is incorrect to just clip to the damageRect here once multiple fragments are involved.
-            m_renderLayer.filterRenderer()->endFilterEffect(context);
-        }
     } // Filter clip block

[Stephen White, 2014/11/11 22:20:55]

Nit: maybe we should change this to FilterPainter block?

[chrishtr, 2014/11/11 22:22:42]

Done.

 
     bool shouldPaintMask = (paintFlags & PaintLayerPaintingCompositingMaskPhase) && shouldPaintContent && m_renderLayer.renderer()->hasMask() && !selectionOnly;
     bool shouldPaintClippingMask = (paintFlags & PaintLayerPaintingChildClippingMaskPhase) && shouldPaintContent && !selectionOnly;
 
     if (shouldPaintMask)
         paintMaskForFragments(layerFragments, context, localPaintingInfo, paintingRootForRenderer, paintFlags);
 
     if (shouldPaintClippingMask) {
         // Paint the border radius mask for the fragments.
         paintChildClippingMaskForFragments(layerFragments, context, localPaintingInfo, paintingRootForRenderer, paintFlags);
@@ skipping 23 matching lines @@
     }
 
     return false;
 }
 
 bool LayerPainter::needsToClip(const LayerPaintingInfo& localPaintingInfo, const ClipRect& clipRect)
 {
     return clipRect.rect() != localPaintingInfo.paintDirtyRect || clipRect.hasRadius();
 }
 
-void LayerPainter::applyRoundedRectClips(const LayerPaintingInfo& localPaintingInfo, GraphicsContext* context, PaintLayerFlags paintFlags, ClipRecorder& clipRecorder, BorderRadiusClippingRule rule)
+void LayerPainter::applyRoundedRectClips(RenderLayer& renderLayer, const LayerPaintingInfo& localPaintingInfo, GraphicsContext* context,
+    PaintLayerFlags paintFlags, ClipRecorder& clipRecorder, BorderRadiusClippingRule rule)
 {
     // If the clip rect has been tainted by a border radius, then we have to walk up our layer chain applying the clips from
     // any layers with overflow. The condition for being able to apply these clips is that the overflow object be in our
     // containing block chain so we check that also.
-    for (RenderLayer* layer = rule == IncludeSelfForBorderRadius ? &m_renderLayer : m_renderLayer.parent(); layer; layer = layer->parent()) {
+    for (RenderLayer* layer = rule == IncludeSelfForBorderRadius ? &renderLayer : renderLayer.parent(); layer; layer = layer->parent()) {
         // Composited scrolling layers handle border-radius clip in the compositor via a mask layer. We do not
         // want to apply a border-radius clip to the layer contents itself, because that would require re-rastering
         // every frame to update the clip. We only want to make sure that the mask layer is properly clipped so
         // that it can in turn clip the scrolled contents in the compositor.
         if (layer->needsCompositedScrolling() && !(paintFlags & PaintLayerPaintingChildClippingMaskPhase))
             break;
 
-        if (layer->renderer()->hasOverflowClip() && layer->renderer()->style()->hasBorderRadius() && inContainingBlockChain(&m_renderLayer, layer)) {
+        if (layer->renderer()->hasOverflowClip() && layer->renderer()->style()->hasBorderRadius() && inContainingBlockChain(&renderLayer, layer)) {
             LayoutPoint delta;
             layer->convertToLayerCoords(localPaintingInfo.rootLayer, delta);
             clipRecorder.addRoundedRectClip(layer->renderer()->style()->getRoundedInnerBorderFor(LayoutRect(delta, layer->size())));
         }
 
         if (layer == localPaintingInfo.rootLayer)
             break;
     }
 }
 
@@ skipping 95 matching lines @@
 void LayerPainter::paintOverflowControlsForFragments(const LayerFragments& layerFragments, GraphicsContext* context, const LayerPaintingInfo& localPaintingInfo, PaintLayerFlags paintFlags)
 {
     for (size_t i = 0; i < layerFragments.size(); ++i) {
         const LayerFragment& fragment = layerFragments.at(i);
 
         OwnPtr<ClipRecorder> clipRecorder;
 
         if (needsToClip(localPaintingInfo, fragment.backgroundRect)) {
             clipRecorder = adoptPtr(new ClipRecorder(&m_renderLayer, context, DisplayItem::ClipLayerOverflowControls, fragment.backgroundRect));
             if (fragment.backgroundRect.hasRadius())
-                applyRoundedRectClips(localPaintingInfo, context, paintFlags, *clipRecorder);
+                applyRoundedRectClips(m_renderLayer, localPaintingInfo, context, paintFlags, *clipRecorder);
         }
         if (RenderLayerScrollableArea* scrollableArea = m_renderLayer.scrollableArea())
             scrollableArea->paintOverflowControls(context, roundedIntPoint(toPoint(fragment.layerBounds.location() - m_renderLayer.renderBoxLocation() + subPixelAccumulationIfNeeded(localPaintingInfo.subPixelAccumulation, m_renderLayer.compositingState()))), pixelSnappedIntRect(fragment.backgroundRect.rect()), true);
     }
 }
 
 static bool checkContainingBlockChainForPagination(RenderLayerModelObject* renderer, RenderBox* ancestorColumnsRenderer)
 {
     RenderView* view = renderer->view();
     RenderLayerModelObject* prevBlock = renderer;
@@ skipping 168 matching lines @@
             break;
         case PaintPhaseClippingMask:
             clipType = DisplayItem::ClipLayerFragmentClippingMask;
             break;
         default:
             ASSERT_NOT_REACHED();
         }
 
         clipRecorder = adoptPtr(new ClipRecorder(&m_renderLayer, context, clipType, clipRect));
         if (clipRect.hasRadius())
-            applyRoundedRectClips(paintingInfo, context, paintFlags, *clipRecorder, clippingRule);
+            applyRoundedRectClips(m_renderLayer, paintingInfo, context, paintFlags, *clipRecorder, clippingRule);
     }
 
     PaintInfo paintInfo(context, pixelSnappedIntRect(clipRect.rect()), phase, paintBehavior, paintingRootForRenderer, 0, paintingInfo.rootLayer->renderer());
     m_renderLayer.renderer()->paint(paintInfo, toPoint(fragment.layerBounds.location() - m_renderLayer.renderBoxLocation() + subPixelAccumulationIfNeeded(paintingInfo.subPixelAccumulation, m_renderLayer.compositingState())));
 }
 
 void LayerPainter::paintBackgroundForFragments(const LayerFragments& layerFragments, GraphicsContext* context,
     const LayoutRect& transparencyPaintDirtyRect, bool haveTransparency, const LayerPaintingInfo& localPaintingInfo, PaintBehavior paintBehavior,
     RenderObject* paintingRootForRenderer, PaintLayerFlags paintFlags)
 {
@@ skipping 21 matching lines @@
         }
     }
 
     // Optimize clipping for the single fragment case.
     bool shouldClip = localPaintingInfo.clipToDirtyRect && layerFragments.size() == 1 && !layerFragments[0].foregroundRect.isEmpty();
     ClipState clipState = HasNotClipped;
     OwnPtr<ClipRecorder> clipRecorder;
     if (shouldClip && needsToClip(localPaintingInfo, layerFragments[0].foregroundRect)) {
         clipRecorder = adoptPtr(new ClipRecorder(&m_renderLayer, context, DisplayItem::ClipLayerForeground, layerFragments[0].foregroundRect));
         if (layerFragments[0].foregroundRect.hasRadius())
-            applyRoundedRectClips(localPaintingInfo, context, paintFlags, *clipRecorder);
+            applyRoundedRectClips(m_renderLayer, localPaintingInfo, context, paintFlags, *clipRecorder);
         clipState = HasClipped;
     }
 
     // We have to loop through every fragment multiple times, since we have to issue paint invalidations in each specific phase in order for
     // interleaving of the fragments to work properly.
     paintForegroundForFragmentsWithPhase(selectionOnly ? PaintPhaseSelection : PaintPhaseChildBlockBackgrounds, layerFragments,
         context, localPaintingInfo, paintBehavior, paintingRootForRenderer, paintFlags, clipState);
 
     if (!selectionOnly) {
         paintForegroundForFragmentsWithPhase(PaintPhaseFloat, layerFragments, context, localPaintingInfo, paintBehavior, paintingRootForRenderer, paintFlags, clipState);
@@ skipping 75 matching lines @@
 
         OwnPtr<ClipRecorder> clipRecorder;
         if (needsToClip(paintingInfo, clipRect))
             clipRecorder = adoptPtr(new ClipRecorder(m_renderLayer.parent(), context, DisplayItem::ClipLayerFragmentParent, clipRect));
 
         paintLayerByApplyingTransform(context, paintingInfo, paintFlags, fragment.paginationOffset);
     }
 }
 
 } // namespace blink