Organize internal properties of cc/ layer types

cc/draw_properties.h

+// Copyright 2012 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.
+
+#ifndef CC_DRAW_PROPERTIES_H_
+#define CC_DRAW_PROPERTIES_H_
+
+#include "base/memory/scoped_ptr.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, typename RenderSurfaceType>
+struct CC_EXPORT DrawProperties {
+    DrawProperties()
+        : opacity(0)
+        , opacity_is_animating(false)
+        , target_space_transform_is_animating(false)
+        , screen_space_transform_is_animating(false)
+        , is_clipped(false)
+        , render_target(0)
+    {
+    }
+
+    // Transforms objects from content space to target surface space, where
+    // this layer would be drawn.
+    gfx::Transform target_space_transform;
+
+    // Transforms objects from content space to screen space (viewport space).
+    gfx::Transform screen_space_transform;
+
+    // DrawProperties::opacity may be different than LayerType::opacity,
+    // particularly in the case when a renderSurface re-parents the layer's
+    // opacity, or when opacity is compounded by the hierarchy.
+    float 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 opacity_is_animating;
+    bool target_space_transform_is_animating;
+    bool screen_space_transform_is_animating;
+
+    // True if the layer needs to be clipped by clipRect.
+    bool is_clipped;
+
+    // The layer whose coordinate space this layer draws into. This can be
+    // either the same layer (m_drawProperties.render_target == this) or an
+    // ancestor of this layer.
+    LayerType* render_target;
+
+    // The surface that this layer and its subtree would contribute to.
+    scoped_ptr<RenderSurfaceType> render_surface;
+
+    // This rect is in the layer's content space.
+    gfx::Rect visible_content_rect;
+
+    // In target surface space, the rect that encloses the clipped, drawable
+    // content of the layer.
+    gfx::Rect drawable_content_rect;
+
+    // In target surface space, the original rect that clipped this
+    // layer. This value is used to avoid unnecessarily changing GL scissor
+    // state.
+    gfx::Rect clip_rect;
+};
+
+} // namespace cc

[danakj, 2012/12/05 18:35:00]

nit: 2 spaces before //

+
+#endif // CC_DRAW_PROPERTIES_H_

[danakj, 2012/12/05 18:35:00]

nit: 2 spaces