ui: Add sub region copy support to GLImage::CopyTexImage.

gpu/command_buffer/service/gles2_cmd_decoder.cc

 // Copyright (c) 2012 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/gles2_cmd_decoder.h"
 
 #include <stdio.h>
 
 #include <algorithm>
 #include <cmath>
@@ skipping 11855 matching lines @@
                                        true);
   }
 
   ScopedModifyPixels modify(dest_texture_ref);
 
   // Try using GLImage::CopyTexImage when possible.
   bool unpack_premultiply_alpha_change =
       unpack_premultiply_alpha_ ^ unpack_unpremultiply_alpha_;
   if (image && !unpack_flip_y_ && !unpack_premultiply_alpha_change) {
     glBindTexture(GL_TEXTURE_2D, dest_texture->service_id());
-    if (image->CopyTexImage(GL_TEXTURE_2D))
+    if (image->CopyTexSubImage(GL_TEXTURE_2D, gfx::Point(0, 0),
+                               gfx::Rect(0, 0, source_width, source_height))) {
       return;
+    }
   }
 
   DoWillUseTexImageIfNeeded(source_texture, source_texture->target());
 
   // GL_TEXTURE_EXTERNAL_OES texture requires apply a transform matrix
   // before presenting.
   if (source_texture->target() == GL_TEXTURE_EXTERNAL_OES) {
     // TODO(hkuang): get the StreamTexture transform matrix in GPU process
     // instead of using kIdentityMatrix crbug.com/226218.
     copy_texture_CHROMIUM_->DoCopyTextureWithTransform(
@@ skipping 115 matching lines @@
   } else {
     texture_manager()->SetLevelCleared(dest_texture_ref, GL_TEXTURE_2D, 0,
                                        true);
   }
 
   ScopedModifyPixels modify(dest_texture_ref);
 
   // Try using GLImage::CopyTexSubImage when possible.
   bool unpack_premultiply_alpha_change =
       unpack_premultiply_alpha_ ^ unpack_unpremultiply_alpha_;
-  if (image && !unpack_flip_y_ && !unpack_premultiply_alpha_change &&
-      !xoffset && !yoffset) {
+  if (image && !unpack_flip_y_ && !unpack_premultiply_alpha_change) {
     glBindTexture(GL_TEXTURE_2D, dest_texture->service_id());
-    if (image->CopyTexImage(GL_TEXTURE_2D))
+    if (image->CopyTexSubImage(GL_TEXTURE_2D, gfx::Point(xoffset, yoffset),
+                               gfx::Rect(0, 0, source_width, source_height))) {
       return;
+    }
   }
 
   DoWillUseTexImageIfNeeded(source_texture, source_texture->target());
 
   // GL_TEXTURE_EXTERNAL_OES texture requires apply a transform matrix
   // before presenting.
   if (source_texture->target() == GL_TEXTURE_EXTERNAL_OES) {
     // TODO(hkuang): get the StreamTexture transform matrix in GPU process
     // instead of using kIdentityMatrix crbug.com/226218.
     copy_texture_CHROMIUM_->DoCopySubTextureWithTransform(
@@ skipping 1158 matching lines @@
   }
 }
 
 // Include the auto-generated part of this file. We split this because it means
 // we can easily edit the non-auto generated parts right here in this file
 // instead of having to edit some template or the code generator.
 #include "gpu/command_buffer/service/gles2_cmd_decoder_autogen.h"
 
 }  // namespace gles2
 }  // namespace gpu