1 // Copyright 2011 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_RESOURCES_PLATFORM_COLOR_H_ 6 #define CC_RESOURCES_PLATFORM_COLOR_H_ 7 8 #include "base/basictypes.h" 9 #include "base/logging.h" 10 #include "third_party/khronos/GLES2/gl2.h" 11 #include "third_party/khronos/GLES2/gl2ext.h" 12 #include "third_party/skia/include/core/SkTypes.h" 13 14 namespace cc { 15 16 class PlatformColor { 17 public: 18 enum SourceDataFormat { 19 SOURCE_FORMAT_RGBA8, 20 SOURCE_FORMAT_BGRA8 21 }; 22 23 static SourceDataFormat Format() { 24 return SK_B32_SHIFT ? SOURCE_FORMAT_RGBA8 : SOURCE_FORMAT_BGRA8; 25 } 26 27 // Returns the most efficient texture format for this platform. 28 static GLenum BestTextureFormat(bool supports_bgra8888) { 29 GLenum texture_format = GL_RGBA; 30 switch (Format()) { 31 case SOURCE_FORMAT_RGBA8: 32 break; 33 case SOURCE_FORMAT_BGRA8: 34 if (supports_bgra8888) 35 texture_format = GL_BGRA_EXT; 36 break; 37 default: 38 NOTREACHED(); 39 break; 40 } 41 return texture_format; 42 } 43 44 // Return true if the given texture format has the same component order 45 // as the color on this platform. 46 static bool SameComponentOrder(GLenum texture_format) { 47 switch (Format()) { 48 case SOURCE_FORMAT_RGBA8: 49 return texture_format == GL_RGBA; 50 case SOURCE_FORMAT_BGRA8: 51 return texture_format == GL_BGRA_EXT; 52 default: 53 NOTREACHED(); 54 return false; 55 } 56 } 57 58 private: 59 DISALLOW_IMPLICIT_CONSTRUCTORS(PlatformColor); 60 }; 61 62 } // namespace cc 63 64 #endif // CC_RESOURCES_PLATFORM_COLOR_H_ 65