| // 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/FixedPositionContainerDisplayItem.h" |
| #include "platform/graphics/paint/FixedPositionDisplayItem.h" |
| #include "platform/graphics/paint/PaintController.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::slimmingPaintV2Enabled()) |
| return; |
| |
| if (m_isFixedPosition) |
| m_graphicsContext.paintController().createAndAppend<BeginFixedPositionDisplayItem>(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.paintController().createAndAppend<BeginFixedPositionContainerDisplayItem>(m_layoutObject); |
| } |
| |
| LayerFixedPositionRecorder::~LayerFixedPositionRecorder() |
| { |
| if (!RuntimeEnabledFeatures::slimmingPaintV2Enabled()) |
| return; |
| |
| if (m_isFixedPositionContainer) |
| m_graphicsContext.paintController().endItem<EndFixedPositionDisplayItem>(m_layoutObject); |
| if (m_isFixedPosition) |
| m_graphicsContext.paintController().endItem<EndFixedPositionDisplayItem>(m_layoutObject); |
| } |
| |
| } // namespace blink |
