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| 1 // Copyright 2014 The Chromium Authors. All rights reserved. | 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 | 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 CONTENT_COMMON_GPU_CLIENT_GL_HELPER_READBACK_SUPPORT_H_ | 5 #ifndef CONTENT_COMMON_GPU_CLIENT_GL_HELPER_READBACK_SUPPORT_H_ |
| 6 #define CONTENT_COMMON_GPU_CLIENT_GL_HELPER_READBACK_SUPPORT_H_ | 6 #define CONTENT_COMMON_GPU_CLIENT_GL_HELPER_READBACK_SUPPORT_H_ |
| 7 | 7 |
| 8 #include <vector> | 8 #include <vector> |
| 9 | 9 |
| 10 #include "content/common/gpu/client/gl_helper.h" | 10 #include "content/common/gpu/client/gl_helper.h" |
| 11 | 11 |
| 12 namespace content { | 12 namespace content { |
| 13 | 13 |
| 14 class CONTENT_EXPORT GLHelperReadbackSupport { | 14 class CONTENT_EXPORT GLHelperReadbackSupport { |
| 15 public: | 15 public: |
| 16 GLHelperReadbackSupport(gpu::gles2::GLES2Interface* gl); | 16 GLHelperReadbackSupport(gpu::gles2::GLES2Interface* gl); |
| 17 | 17 |
| 18 ~GLHelperReadbackSupport(); | 18 ~GLHelperReadbackSupport(); |
| 19 | 19 |
| 20 // Checks whether the readback (Color read format and type) is supported | 20 // Checks whether the readback (Color read format and type) is supported |
| 21 // for the requested texture format by the hardware or not. | 21 // for the requested texture format by the hardware or not. |
| 22 // For ex: some hardwares have rgb565 readback | 22 // For ex: some hardwares have rgb565 readback |
| 23 // support when binded with the frame buffer for others it may fail. | 23 // support when binded with the frame buffer for others it may fail. |
| 24 // Here we pass the internal textureformat as skia config. | 24 // Here we pass the internal textureformat as skia config. |
| 25 bool IsReadbackConfigSupported(SkBitmap::Config texture_format); | 25 bool IsReadbackConfigSupported(SkColorType texture_format); |
| 26 | 26 |
| 27 // Provides the additional readback format/type pairing for a render target | 27 // Provides the additional readback format/type pairing for a render target |
| 28 // of a given format/type pairing | 28 // of a given format/type pairing |
| 29 void GetAdditionalFormat(GLint format, GLint type, GLint *format_out, | 29 void GetAdditionalFormat(GLint format, GLint type, GLint *format_out, |
| 30 GLint *type_out); | 30 GLint *type_out); |
| 31 private: | 31 private: |
| 32 enum FormatSupport { FORMAT_NOT_SUPPORTED = 0, FORMAT_SUPPORTED, }; | 32 enum FormatSupport { FORMAT_NOT_SUPPORTED = 0, FORMAT_SUPPORTED, }; |
| 33 | 33 |
| 34 struct FormatCacheEntry { | 34 struct FormatCacheEntry { |
| 35 GLint format; | 35 GLint format; |
| 36 GLint type; | 36 GLint type; |
| 37 GLint read_format; | 37 GLint read_format; |
| 38 GLint read_type; | 38 GLint read_type; |
| 39 }; | 39 }; |
| 40 | 40 |
| 41 // This populates the format_support_table with the list of supported | 41 // This populates the format_support_table with the list of supported |
| 42 // formats. | 42 // formats. |
| 43 void InitializeReadbackSupport(); | 43 void InitializeReadbackSupport(); |
| 44 | 44 |
| 45 // This api is called once per format and it is done in the | 45 // This api is called once per format and it is done in the |
| 46 // InitializeReadbackSupport. We should not use this any where | 46 // InitializeReadbackSupport. We should not use this any where |
| 47 // except the InitializeReadbackSupport.Calling this at other places | 47 // except the InitializeReadbackSupport.Calling this at other places |
| 48 // can distrub the state of normal gl operations. | 48 // can distrub the state of normal gl operations. |
| 49 void CheckForReadbackSupport(SkBitmap::Config texture_format); | 49 void CheckForReadbackSupport(SkColorType texture_format); |
| 50 | 50 |
| 51 // Helper functions for checking the supported texture formats. | 51 // Helper functions for checking the supported texture formats. |
| 52 // Avoid using this API in between texture operations, as this does some | 52 // Avoid using this API in between texture operations, as this does some |
| 53 // teture opertions (bind, attach) internally. | 53 // teture opertions (bind, attach) internally. |
| 54 bool SupportsFormat(GLint format, GLint type); | 54 bool SupportsFormat(GLint format, GLint type); |
| 55 | 55 |
| 56 FormatSupport format_support_table_[SkBitmap::kConfigCount]; | 56 FormatSupport format_support_table_[kLastEnum_SkColorType + 1]; |
| 57 | 57 |
| 58 gpu::gles2::GLES2Interface* gl_; | 58 gpu::gles2::GLES2Interface* gl_; |
| 59 std::vector<struct FormatCacheEntry> format_cache_; | 59 std::vector<struct FormatCacheEntry> format_cache_; |
| 60 }; | 60 }; |
| 61 | 61 |
| 62 } // namespace content | 62 } // namespace content |
| 63 | 63 |
| 64 #endif // CONTENT_COMMON_GPU_CLIENT_GL_HELPER_READBACK_SUPPORT_H_ | 64 #endif // CONTENT_COMMON_GPU_CLIENT_GL_HELPER_READBACK_SUPPORT_H_ |
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