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1 // Copyright 2014 The Chromium Authors. All rights reserved.
2 // Use of this source code is governed by a BSD-style license that can be
3 // found in the LICENSE file.
4 
5 #ifndef CC_TREES_OCCLUSION_H_
6 #define CC_TREES_OCCLUSION_H_
7 
8 #include "base/basictypes.h"
9 #include "cc/base/cc_export.h"
10 #include "cc/base/simple_enclosed_region.h"
11 #include "ui/gfx/rect.h"
12 #include "ui/gfx/transform.h"
13 
14 namespace cc {
15 
16 class CC_EXPORT Occlusion {
17  public:
18   Occlusion();
19   Occlusion(const gfx::Transform& draw_transform,
20             const SimpleEnclosedRegion& occlusion_from_outside_target,
21             const SimpleEnclosedRegion& occlusion_from_inside_target);
22 
23   bool IsOccluded(const gfx::Rect& content_rect) const;
24   gfx::Rect GetUnoccludedContentRect(const gfx::Rect& content_rect) const;
25 
26  private:
27   gfx::Rect GetUnoccludedRectInTargetSurface(
28       const gfx::Rect& content_rect) const;
29 
30   gfx::Transform draw_transform_;
31   SimpleEnclosedRegion occlusion_from_outside_target_;
32   SimpleEnclosedRegion occlusion_from_inside_target_;
33 };
34 
35 }  // namespace cc
36 
37 #endif  // CC_TREES_OCCLUSION_H_
38