Organize internal properties of cc/ layer types

cc/draw_properties.h

+// Copyright 2011 The Chromium Authors. All rights reserved.

[danakj, 2012/12/03 18:54:36]

2012.

Use chromium style names/indents for new files.

+// Use of this source code is governed by a BSD-style license that can be
+// found in the LICENSE file.
+
+#ifndef CC_DRAW_PROPERTIES_H_
+#define CC_DRAW_PROPERTIES_H_
+
+#include "ui/gfx/rect.h"
+#include "ui/gfx/transform.h"
+
+namespace cc {
+
+// Container for properties that layers need to compute before they can be
+// drawn.
+template<typename LayerType>
+struct DrawProperties {
+    DrawProperties()
+        : drawOpacity(0)
+        , drawOpacityIsAnimating(false)
+        , drawTransformIsAnimating(false)
+        , screenSpaceTransformIsAnimating(false)
+        , isClipped(false)
+        , renderTarget(0)
+    {
+    }
+
+    // Transforms objects from content space to target surface space, where
+    // this layer would be drawn.
+    gfx::Transform drawTransform;

[jamesr, 2012/12/04 06:44:32]

drawProperties().drawTransform is a bit redundant. maybe just
drawProperties().transform ?

+
+    // Transforms objects from content space to screen space (viewport space).
+    gfx::Transform screenSpaceTransform;
+
+    // drawOpacity may be different than layer's opacity, particularly in the
+    // case where a renderSurface re-parents the layer's opacity.
+    float drawOpacity;

[jamesr, 2012/12/04 06:44:32]

same here - drawProperties().opacity ?

+
+    // XXXIsAnimating flags are used to indicate whether the drawProperties
+    // are actually meaningful on the main thread. When the properties are
+    // animating, the main thread may not have the same values that are used
+    // to draw.
+    bool drawOpacityIsAnimating;
+    bool drawTransformIsAnimating;

[jamesr, 2012/12/04 06:44:32]

more possibly unnecessary draw prefixes

+    bool screenSpaceTransformIsAnimating;
+
+    // True if the layer needs to be clipped by clipRect.
+    bool isClipped;
+
+    // The layer whose coordinate space this layer draws into. This can be
+    // either the same layer (m_drawProperties.renderTarget == this) or an
+    // ancestor of this layer.
+    LayerType* renderTarget;
+
+    // Uses layer's content space.
+    gfx::Rect visibleContentRect;
+
+    // In target surface space, the rect that encloses the clipped, drawable
+    // content of the layer.
+    gfx::Rect drawableContentRect;
+
+    // In target surface space, the original rect that clipped this
+    // layer. This value is used to avoid unnecessarily changing GL scissor
+    // state.
+    gfx::Rect clipRect;
+};
+
+}

[danakj, 2012/12/03 18:54:36]

}  // namespace cc

+
+#endif // CC_DRAW_PROPERTIES_H_