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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 COMPONENTS_DISPLAY_COMPOSITOR_GL_HELPER_READBACK_SUPPORT_H_ | |
| 6 #define COMPONENTS_DISPLAY_COMPOSITOR_GL_HELPER_READBACK_SUPPORT_H_ | |
| 7 | |
| 8 #include <stddef.h> | |
| 9 | |
| 10 #include <vector> | |
| 11 | |
| 12 #include "components/display_compositor/display_compositor_export.h" | |
| 13 #include "components/display_compositor/gl_helper.h" | |
| 14 | |
| 15 namespace display_compositor { | |
| 16 | |
| 17 class DISPLAY_COMPOSITOR_EXPORT GLHelperReadbackSupport { | |
| 18 public: | |
| 19 enum FormatSupport { SUPPORTED, SWIZZLE, NOT_SUPPORTED }; | |
| 20 | |
| 21 GLHelperReadbackSupport(gpu::gles2::GLES2Interface* gl); | |
| 22 | |
| 23 ~GLHelperReadbackSupport(); | |
| 24 | |
| 25 // For a given color type retrieve whether readback is supported and if so | |
| 26 // how it should be performed. The |format|, |type| and |bytes_per_pixel| are | |
| 27 // the values that should be used with glReadPixels to facilitate the | |
| 28 // readback. If |can_swizzle| is true then this method will return SWIZZLE if | |
| 29 // the data needs to be swizzled before using the returned |format| otherwise | |
| 30 // the method will return SUPPORTED to indicate that readback is permitted of | |
| 31 // this color othewise NOT_SUPPORTED will be returned. This method always | |
| 32 // overwrites the out values irrespective of the return value. | |
| 33 FormatSupport GetReadbackConfig(SkColorType color_type, | |
| 34 bool can_swizzle, | |
| 35 GLenum* format, | |
| 36 GLenum* type, | |
| 37 size_t* bytes_per_pixel); | |
| 38 // Provides the additional readback format/type pairing for a render target | |
| 39 // of a given format/type pairing | |
| 40 void GetAdditionalFormat(GLenum format, | |
| 41 GLenum type, | |
| 42 GLenum* format_out, | |
| 43 GLenum* type_out); | |
| 44 | |
| 45 private: | |
| 46 struct FormatCacheEntry { | |
| 47 GLenum format; | |
| 48 GLenum type; | |
| 49 GLenum read_format; | |
| 50 GLenum read_type; | |
| 51 }; | |
| 52 | |
| 53 // This populates the format_support_table with the list of supported | |
| 54 // formats. | |
| 55 void InitializeReadbackSupport(); | |
| 56 | |
| 57 // This api is called once per format and it is done in the | |
| 58 // InitializeReadbackSupport. We should not use this any where | |
| 59 // except the InitializeReadbackSupport.Calling this at other places | |
| 60 // can distrub the state of normal gl operations. | |
| 61 void CheckForReadbackSupport(SkColorType texture_format); | |
| 62 | |
| 63 // Helper functions for checking the supported texture formats. | |
| 64 // Avoid using this API in between texture operations, as this does some | |
| 65 // teture opertions (bind, attach) internally. | |
| 66 bool SupportsFormat(GLenum format, GLenum type); | |
| 67 | |
| 68 FormatSupport format_support_table_[kLastEnum_SkColorType + 1]; | |
| 69 | |
| 70 gpu::gles2::GLES2Interface* gl_; | |
| 71 std::vector<struct FormatCacheEntry> format_cache_; | |
| 72 }; | |
| 73 | |
| 74 } // namespace display_compositor | |
| 75 | |
| 76 #endif // COMPONENTS_DISPLAY_COMPOSITOR_GL_HELPER_READBACK_SUPPORT_H_ | |
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Chromium Code Reviews
Issue 2873243002:
Move components/display_compositor to components/viz/display_compositor (Closed)
