cc/platform_color.h

   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_PLATFORM_COLOR_H_
   6 #define CC_PLATFORM_COLOR_H_
   7
   8 #include "third_party/WebKit/Source/Platform/chromium/public/WebGraphicsContext3D.h"
   9 #include "third_party/khronos/GLES2/gl2.h"
  10 #include "third_party/khronos/GLES2/gl2ext.h"
  11 #include "third_party/skia/include/core/SkTypes.h"
  12
  13 namespace cc {
  14
  15 class PlatformColor {
  16 public:
  17     enum SourceDataFormat { SourceFormatRGBA8, SourceFormatBGRA8 };
  18
  19     static SourceDataFormat format()
  20     {
  21         return SK_B32_SHIFT ? SourceFormatRGBA8 : SourceFormatBGRA8;
  22     }
  23
  24     // Returns the most efficient texture format for this platform.
  25     static GLenum bestTextureFormat(WebKit::WebGraphicsContext3D* context, bool supportsBGRA8888)
  26     {
  27         GLenum textureFormat = GL_RGBA;
  28         switch (format()) {
  29         case SourceFormatRGBA8:
  30             break;
  31         case SourceFormatBGRA8:
  32             if (supportsBGRA8888)
  33                 textureFormat = GL_BGRA_EXT;
  34             break;
  35         default:
  36             NOTREACHED();
  37             break;
  38         }
  39         return textureFormat;
  40     }
  41
  42     // Return true if the given texture format has the same component order
  43     // as the color on this platform.
  44     static bool sameComponentOrder(GLenum textureFormat)
  45     {
  46         switch (format()) {
  47         case SourceFormatRGBA8:
  48             return textureFormat == GL_RGBA;
  49         case SourceFormatBGRA8:
  50             return textureFormat == GL_BGRA_EXT;
  51         default:
  52             NOTREACHED();
  53             return false;
  54         }
  55     }
  56 };
  57
  58 } // namespace cc
  59
  60 #endif  // CC_PLATFORM_COLOR_H_