1 files changed, 94 insertions, 0 deletions
diff --git a/chromium/third_party/WebKit/Source/core/rendering/compositing/CompositingInputsUpdater.cpp b/chromium/third_party/WebKit/Source/core/rendering/compositing/CompositingInputsUpdater.cpp
new file mode 100644
index 00000000000..af8ea1f0973
--- /dev/null
+++ b/chromium/third_party/WebKit/Source/core/rendering/compositing/CompositingInputsUpdater.cpp
@@ -0,0 +1,94 @@
+// 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/rendering/compositing/CompositingInputsUpdater.h"
+
+#include "core/rendering/RenderBlock.h"
+#include "core/rendering/RenderLayer.h"
+#include "core/rendering/compositing/CompositedLayerMapping.h"
+
+namespace WebCore {
+
+CompositingInputsUpdater::CompositingInputsUpdater(RenderLayer* rootRenderLayer)
+    : m_geometryMap(UseTransforms)
+    , m_rootRenderLayer(rootRenderLayer)
+{
+    rootRenderLayer->updateDescendantDependentFlags();
+}
+
+CompositingInputsUpdater::~CompositingInputsUpdater()
+{
+}
+
+void CompositingInputsUpdater::update(RenderLayer* layer, UpdateType updateType, AncestorInfo info)
+{
+    if (!layer->childNeedsCompositingInputsUpdate() && updateType != ForceUpdate)
+        return;
+
+    m_geometryMap.pushMappingsToAncestor(layer, layer->parent());
+
+    if (layer->hasCompositedLayerMapping())
+        info.enclosingCompositedLayer = layer;
+
+    if (layer->needsCompositingInputsUpdate()) {
+        if (info.enclosingCompositedLayer)
+            info.enclosingCompositedLayer->compositedLayerMapping()->setNeedsGraphicsLayerUpdate(GraphicsLayerUpdateSubtree);
+        updateType = ForceUpdate;
+    }
+
+    if (updateType == ForceUpdate) {
+        RenderLayer::CompositingInputs properties;
+
+        if (!layer->isRootLayer()) {
+            properties.clippedAbsoluteBoundingBox = enclosingIntRect(m_geometryMap.absoluteRect(layer->boundingBoxForCompositingOverlapTest()));
+            // FIXME: Setting the absBounds to 1x1 instead of 0x0 makes very little sense,
+            // but removing this code will make JSGameBench sad.
+            // See https://codereview.chromium.org/13912020/
+            if (properties.clippedAbsoluteBoundingBox.isEmpty())
+                properties.clippedAbsoluteBoundingBox.setSize(IntSize(1, 1));
+
+            IntRect clipRect = pixelSnappedIntRect(layer->clipper().backgroundClipRect(ClipRectsContext(m_rootRenderLayer, AbsoluteClipRects)).rect());
+            properties.clippedAbsoluteBoundingBox.intersect(clipRect);
+
+            const RenderLayer* parent = layer->parent();
+            properties.opacityAncestor = parent->isTransparent() ? parent : parent->compositingInputs().opacityAncestor;
+            properties.transformAncestor = parent->transform() ? parent : parent->compositingInputs().transformAncestor;
+            properties.filterAncestor = parent->hasFilter() ? parent : parent->compositingInputs().filterAncestor;
+
+            if (layer->renderer()->isOutOfFlowPositioned() && info.ancestorScrollingLayer && !layer->subtreeIsInvisible()) {
+                const RenderObject* container = layer->renderer()->containingBlock();
+                const RenderObject* scroller = info.ancestorScrollingLayer->renderer();
+                properties.isUnclippedDescendant = scroller != container && scroller->isDescendantOf(container);
+            }
+        }
+
+        layer->updateCompositingInputs(properties);
+    }
+
+    if (layer->scrollsOverflow())
+        info.ancestorScrollingLayer = layer;
+
+    for (RenderLayer* child = layer->firstChild(); child; child = child->nextSibling())
+        update(child, updateType, info);
+
+    m_geometryMap.popMappingsToAncestor(layer->parent());
+
+    layer->clearChildNeedsCompositingInputsUpdate();
+}
+
+#if ASSERT_ENABLED
+
+void CompositingInputsUpdater::assertNeedsCompositingInputsUpdateBitsCleared(RenderLayer* layer)
+{
+    ASSERT(!layer->childNeedsCompositingInputsUpdate());
+    ASSERT(!layer->needsCompositingInputsUpdate());
+
+    for (RenderLayer* child = layer->firstChild(); child; child = child->nextSibling())
+        assertNeedsCompositingInputsUpdateBitsCleared(child);
+}
+
+#endif
+
+} // namespace WebCore