Introduction of parameter to readBackFramebuffer set of APIs to allow reading from the currently ...

content/renderer/gpu/webgraphicscontext3d_command_buffer_impl.cc

 // Copyright (c) 2011 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.
 
 #if defined(ENABLE_GPU)
 
 #include "content/renderer/gpu/webgraphicscontext3d_command_buffer_impl.h"
 
 #include <GLES2/gl2.h>
 #ifndef GL_GLEXT_PROTOTYPES
@@ skipping 277 matching lines @@
   // framebuffer vertically before reading it back for compositing
   // via software. This code was quite complicated, used a lot of
   // GPU memory, and didn't provide an obvious speedup. Since this
   // vertical flip is only a temporary solution anyway until Chrome
   // is fully GPU composited, it wasn't worth the complexity.
 
   bool mustRestoreFBO = (bound_fbo_ != buffer);
   if (mustRestoreFBO) {
     gl_->BindFramebuffer(GL_FRAMEBUFFER, buffer);
   }
-   gl_->ReadPixels(0, 0, width, height,
-                   GL_RGBA, GL_UNSIGNED_BYTE, pixels);
+
+  gl_->ReadPixels(0, 0, width, height,
+                  GL_RGBA, GL_UNSIGNED_BYTE, pixels);
 
   // Swizzle red and blue channels
   // TODO(kbr): expose GL_BGRA as extension
   for (size_t i = 0; i < buffer_size; i += 4) {
     std::swap(pixels[i], pixels[i + 2]);
   }
 
   if (mustRestoreFBO) {
     gl_->BindFramebuffer(GL_FRAMEBUFFER, bound_fbo_);
   }
 
 #ifdef FLIP_FRAMEBUFFER_VERTICALLY
   if (pixels) {
     FlipVertically(pixels, width, height);
   }
 #endif
 
   return true;
 }
 
 bool WebGraphicsContext3DCommandBufferImpl::readBackFramebuffer(
     unsigned char* pixels,
-    size_t buffer_size) {
-  return readBackFramebuffer(pixels, buffer_size, 0, width(), height());
+    size_t buffer_size, bool bindDefaultFramebuffer) {
+  if (bindDefaultFramebuffer)
+    return readBackFramebuffer(pixels, buffer_size, 0, width(), height());
+
+  return readBackFramebuffer(pixels, buffer_size, bound_fbo_, width(), height());
 }
 
 void WebGraphicsContext3DCommandBufferImpl::synthesizeGLError(
     WGC3Denum error) {
   if (find(synthetic_errors_.begin(), synthetic_errors_.end(), error) ==
       synthetic_errors_.end()) {
     synthetic_errors_.push_back(error);
   }
 }
 
@@ skipping 724 matching lines @@
     context_lost_callback_->onContextLost();
   }
 
   RenderView* renderview =
       web_view_ ? RenderView::FromWebView(web_view_) : NULL;
   if (renderview)
     renderview->OnViewContextSwapBuffersAborted();
 }
 
 #endif  // defined(ENABLE_GPU)