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4256d4a224
This is an optimization to avoid painting backgrounds that are obscured. It's a lot of complexity that it's not clear we'll need given that we're using a GL backend. Also, we can add it back in more easily/efficiently in the future once we have a display list architecture. This also means we can remove the needsPaintInvalidation dirty bit and some opacity information on filters. R=esprehn@chromium.org Review URL: https://codereview.chromium.org/856563006
66 lines
2.1 KiB
C++
66 lines
2.1 KiB
C++
// Copyright 2014 The Chromium Authors. All rights reserved.
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// Use of this source code is governed by a BSD-style license that can be
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// found in the LICENSE file.
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#ifndef SKY_ENGINE_CORE_RENDERING_STYLE_STYLEDIFFERENCE_H_
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#define SKY_ENGINE_CORE_RENDERING_STYLE_STYLEDIFFERENCE_H_
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#include "sky/engine/wtf/Assertions.h"
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namespace blink {
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class StyleDifference {
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public:
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enum PropertyDifference {
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TransformChanged = 1 << 0,
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OpacityChanged = 1 << 1,
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ZIndexChanged = 1 << 2,
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FilterChanged = 1 << 3,
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};
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StyleDifference()
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: m_layoutType(NoLayout)
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, m_propertySpecificDifferences(0)
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{ }
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bool needsLayout() const { return m_layoutType != NoLayout; }
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void clearNeedsLayout() { m_layoutType = NoLayout; }
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// The offset of this positioned object has been updated.
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bool needsPositionedMovementLayout() const { return m_layoutType == PositionedMovement; }
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void setNeedsPositionedMovementLayout()
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{
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ASSERT(!needsFullLayout());
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m_layoutType = PositionedMovement;
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}
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bool needsFullLayout() const { return m_layoutType == FullLayout; }
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void setNeedsFullLayout() { m_layoutType = FullLayout; }
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bool transformChanged() const { return m_propertySpecificDifferences & TransformChanged; }
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void setTransformChanged() { m_propertySpecificDifferences |= TransformChanged; }
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bool opacityChanged() const { return m_propertySpecificDifferences & OpacityChanged; }
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void setOpacityChanged() { m_propertySpecificDifferences |= OpacityChanged; }
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bool zIndexChanged() const { return m_propertySpecificDifferences & ZIndexChanged; }
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void setZIndexChanged() { m_propertySpecificDifferences |= ZIndexChanged; }
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bool filterChanged() const { return m_propertySpecificDifferences & FilterChanged; }
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void setFilterChanged() { m_propertySpecificDifferences |= FilterChanged; }
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private:
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enum LayoutType {
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NoLayout = 0,
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PositionedMovement,
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FullLayout
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};
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unsigned m_layoutType : 2;
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unsigned m_propertySpecificDifferences : 5;
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};
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} // namespace blink
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#endif // SKY_ENGINE_CORE_RENDERING_STYLE_STYLEDIFFERENCE_H_
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