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1 // Copyright 2013 The Chromium Authors. All rights reserved. | 1 // Copyright 2013 The Chromium Authors. All rights reserved. |
2 // Use of this source code is governed by a BSD-style license that can be | 2 // Use of this source code is governed by a BSD-style license that can be |
3 // found in the LICENSE file. | 3 // found in the LICENSE file. |
4 | 4 |
5 #ifndef UI_GFX_GPU_MEMORY_BUFFER_H_ | 5 #ifndef UI_GFX_GPU_MEMORY_BUFFER_H_ |
6 #define UI_GFX_GPU_MEMORY_BUFFER_H_ | 6 #define UI_GFX_GPU_MEMORY_BUFFER_H_ |
7 | 7 |
8 #include "base/memory/shared_memory.h" | 8 #include "base/memory/shared_memory.h" |
9 #include "build/build_config.h" | 9 #include "build/build_config.h" |
10 #include "ui/gfx/gfx_export.h" | 10 #include "ui/gfx/gfx_export.h" |
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40 | 40 |
41 // Interface for creating and accessing a zero-copy GPU memory buffer. | 41 // Interface for creating and accessing a zero-copy GPU memory buffer. |
42 // This design evolved from the generalization of GraphicBuffer API | 42 // This design evolved from the generalization of GraphicBuffer API |
43 // of Android framework. | 43 // of Android framework. |
44 // | 44 // |
45 // THREADING CONSIDERATIONS: | 45 // THREADING CONSIDERATIONS: |
46 // | 46 // |
47 // This interface is thread-safe. However, multiple threads mapping | 47 // This interface is thread-safe. However, multiple threads mapping |
48 // a buffer for Write or ReadOrWrite simultaneously may result in undefined | 48 // a buffer for Write or ReadOrWrite simultaneously may result in undefined |
49 // behavior and is not allowed. | 49 // behavior and is not allowed. |
50 class UI_EXPORT GpuMemoryBuffer { | 50 class GFX_EXPORT GpuMemoryBuffer { |
51 public: | 51 public: |
52 enum AccessMode { | 52 enum AccessMode { |
53 READ_ONLY, | 53 READ_ONLY, |
54 WRITE_ONLY, | 54 WRITE_ONLY, |
55 READ_WRITE, | 55 READ_WRITE, |
56 }; | 56 }; |
57 | 57 |
58 GpuMemoryBuffer(); | 58 GpuMemoryBuffer(); |
59 virtual ~GpuMemoryBuffer(); | 59 virtual ~GpuMemoryBuffer(); |
60 | 60 |
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73 // Returns the stride in bytes for the buffer. | 73 // Returns the stride in bytes for the buffer. |
74 virtual uint32 GetStride() const = 0; | 74 virtual uint32 GetStride() const = 0; |
75 | 75 |
76 // Returns a platform specific handle for this buffer. | 76 // Returns a platform specific handle for this buffer. |
77 virtual GpuMemoryBufferHandle GetHandle() const = 0; | 77 virtual GpuMemoryBufferHandle GetHandle() const = 0; |
78 }; | 78 }; |
79 | 79 |
80 } // namespace gfx | 80 } // namespace gfx |
81 | 81 |
82 #endif // UI_GFX_GPU_MEMORY_BUFFER_H_ | 82 #endif // UI_GFX_GPU_MEMORY_BUFFER_H_ |
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