Index: Source/core/paint/LayerFixedPositionRecorder.cpp |
diff --git a/Source/core/paint/LayerFixedPositionRecorder.cpp b/Source/core/paint/LayerFixedPositionRecorder.cpp |
new file mode 100644 |
index 0000000000000000000000000000000000000000..966c99925587a33f5481c0efa860ab0e7d717692 |
--- /dev/null |
+++ b/Source/core/paint/LayerFixedPositionRecorder.cpp |
@@ -0,0 +1,54 @@ |
+// Copyright 2015 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/LayerFixedPositionRecorder.h" |
+ |
+#include "core/layout/LayoutBoxModelObject.h" |
+#include "platform/RuntimeEnabledFeatures.h" |
+#include "platform/graphics/GraphicsContext.h" |
+#include "platform/graphics/paint/DisplayItemList.h" |
+#include "platform/graphics/paint/FixedPositionContainerDisplayItem.h" |
+#include "platform/graphics/paint/FixedPositionDisplayItem.h" |
+ |
+namespace blink { |
+ |
+LayerFixedPositionRecorder::LayerFixedPositionRecorder(GraphicsContext& graphicsContext, const LayoutBoxModelObject& layoutObject) |
+ : m_graphicsContext(graphicsContext) |
+ , m_layoutObject(layoutObject) |
+ , m_isFixedPosition(layoutObject.style()->position() == FixedPosition) |
+ , m_isFixedPositionContainer(layoutObject.canContainFixedPositionObjects()) |
+{ |
+ if (!RuntimeEnabledFeatures::slimmingPaintCompositorLayerizationEnabled()) |
+ return; |
+ |
+ if (m_graphicsContext.displayItemList()->displayItemConstructionIsDisabled()) |
+ return; |
+ |
+ if (m_isFixedPosition) |
+ m_graphicsContext.displayItemList()->add(BeginFixedPositionDisplayItem::create(m_layoutObject)); |
+ |
+ // TODO(trchen): Adding a pair of display items on every transformed |
+ // element can be expensive. Investigate whether we can optimize out some |
+ // of them if applicable. |
+ if (m_isFixedPositionContainer) |
+ m_graphicsContext.displayItemList()->add(BeginFixedPositionContainerDisplayItem::create(m_layoutObject)); |
+} |
+ |
+LayerFixedPositionRecorder::~LayerFixedPositionRecorder() |
+{ |
+ if (!RuntimeEnabledFeatures::slimmingPaintCompositorLayerizationEnabled()) |
+ return; |
+ |
+ if (m_graphicsContext.displayItemList()->displayItemConstructionIsDisabled()) |
+ return; |
+ |
+ if (m_isFixedPositionContainer) |
+ m_graphicsContext.displayItemList()->add(EndFixedPositionContainerDisplayItem::create(m_layoutObject)); |
+ |
+ if (m_isFixedPosition) |
+ m_graphicsContext.displayItemList()->add(EndFixedPositionDisplayItem::create(m_layoutObject)); |
+} |
+ |
+} // namespace blink |