Add R_8 GPU memory buffers format.

gpu/command_buffer/service/image_factory.cc

 // Copyright 2014 The Chromium Authors. All rights reserved.
 // Use of this source code is governed by a BSD-style license that can be
 // found in the LICENSE file.
 
 #include "gpu/command_buffer/service/image_factory.h"
 
 #include "gpu/command_buffer/common/capabilities.h"
 #include "ui/gl/gl_bindings.h"
 
 namespace gpu {
 
 ImageFactory::ImageFactory() {
 }
 
 ImageFactory::~ImageFactory() {
 }
 
 // static
 gfx::GpuMemoryBuffer::Format ImageFactory::ImageFormatToGpuMemoryBufferFormat(
     unsigned internalformat) {
   switch (internalformat) {
+    case GL_LUMINANCE:
+    case GL_R8:
+      return gfx::GpuMemoryBuffer::R_8;
     case GL_RGB:
       return gfx::GpuMemoryBuffer::RGBX_8888;
     case GL_RGBA:
       return gfx::GpuMemoryBuffer::RGBA_8888;
     case GL_ATC_RGB_AMD:
       return gfx::GpuMemoryBuffer::ATC;
     case GL_ATC_RGBA_INTERPOLATED_ALPHA_AMD:
       return gfx::GpuMemoryBuffer::ATCIA;
     case GL_COMPRESSED_RGB_S3TC_DXT1_EXT:
       return gfx::GpuMemoryBuffer::DXT1;
@@ skipping 28 matching lines @@
   switch (internalformat) {
     case GL_RGB:
       switch (format) {
         case gfx::GpuMemoryBuffer::ATC:
         case gfx::GpuMemoryBuffer::ATCIA:
         case gfx::GpuMemoryBuffer::DXT1:
         case gfx::GpuMemoryBuffer::DXT5:
         case gfx::GpuMemoryBuffer::ETC1:
         case gfx::GpuMemoryBuffer::RGBX_8888:
           return true;
+        case gfx::GpuMemoryBuffer::R_8:
         case gfx::GpuMemoryBuffer::RGBA_8888:
         case gfx::GpuMemoryBuffer::BGRA_8888:
           return false;
       }
       NOTREACHED();
       return false;
     case GL_RGBA:
       switch (format) {
+        case gfx::GpuMemoryBuffer::R_8:
         case gfx::GpuMemoryBuffer::RGBX_8888:
           return false;
         case gfx::GpuMemoryBuffer::ATC:
         case gfx::GpuMemoryBuffer::ATCIA:
         case gfx::GpuMemoryBuffer::DXT1:
         case gfx::GpuMemoryBuffer::DXT5:
         case gfx::GpuMemoryBuffer::ETC1:
         case gfx::GpuMemoryBuffer::RGBA_8888:
         case gfx::GpuMemoryBuffer::BGRA_8888:
           return true;
       }
-      NOTREACHED();

[reveman, 2015/04/01 13:14:33]

please keep this NOTREACHED

[Daniele Castagna, 2015/04/01 21:58:34]

Done.

-      return false;
+    case GL_LUMINANCE:
+    case GL_R8:
+      return format == gfx::GpuMemoryBuffer::R_8;
     default:
       NOTREACHED();
       return false;
   }
 }
 
 // static
 bool ImageFactory::IsGpuMemoryBufferFormatSupported(
     gfx::GpuMemoryBuffer::Format format,
     const gpu::Capabilities& capabilities) {
   switch (format) {
     case gfx::GpuMemoryBuffer::ATC:
     case gfx::GpuMemoryBuffer::ATCIA:
       return capabilities.texture_format_atc;
     case gfx::GpuMemoryBuffer::BGRA_8888:
       return capabilities.texture_format_bgra8888;
     case gfx::GpuMemoryBuffer::DXT1:
       return capabilities.texture_format_dxt1;
     case gfx::GpuMemoryBuffer::DXT5:
       return capabilities.texture_format_dxt5;
     case gfx::GpuMemoryBuffer::ETC1:
       return capabilities.texture_format_etc1;
+    case gfx::GpuMemoryBuffer::R_8:
     case gfx::GpuMemoryBuffer::RGBA_8888:
     case gfx::GpuMemoryBuffer::RGBX_8888:
       return true;
   }
 
   NOTREACHED();
   return false;
 }
 
 // static
 bool ImageFactory::IsImageSizeValidForGpuMemoryBufferFormat(
     const gfx::Size& size,
     gfx::GpuMemoryBuffer::Format format) {
   switch (format) {
     case gfx::GpuMemoryBuffer::ATC:
     case gfx::GpuMemoryBuffer::ATCIA:
     case gfx::GpuMemoryBuffer::DXT1:
     case gfx::GpuMemoryBuffer::DXT5:
     case gfx::GpuMemoryBuffer::ETC1:
       // Compressed images must have a width and height that's evenly divisible
       // by the block size.
       return size.width() % 4 == 0 && size.height() % 4 == 0;
+    case gfx::GpuMemoryBuffer::R_8:
     case gfx::GpuMemoryBuffer::RGBA_8888:
     case gfx::GpuMemoryBuffer::BGRA_8888:
     case gfx::GpuMemoryBuffer::RGBX_8888:
       return true;
   }
 
   NOTREACHED();
   return false;
 }
 
 }  // namespace gpu