Add compositor support for half-float RGBA buffers and textures

cc/output/direct_renderer.cc

 // Copyright 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 "cc/output/direct_renderer.h"
 
 #include <stddef.h>
 
 #include <unordered_map>
 #include <utility>
@@ skipping 591 matching lines @@
     return true;
   }
 
   ScopedResource* texture = render_pass_textures_[render_pass->id].get();
   DCHECK(texture);
 
   gfx::Size size = RenderPassTextureSize(render_pass);
   size.Enlarge(enlarge_pass_texture_amount_.width(),
                enlarge_pass_texture_amount_.height());
   if (!texture->id()) {
-    texture->Allocate(
-        size, ResourceProvider::TEXTURE_HINT_IMMUTABLE_FRAMEBUFFER,
-        resource_provider_->best_texture_format(), frame->device_color_space);
+    texture->Allocate(size,

[jbauman, 2017/02/01 23:59:21]

Is it expected that BackbufferFormat could change during the life of the
OutputSurface? If so this should check if the formats match and recreate it if
not.

+                      ResourceProvider::TEXTURE_HINT_IMMUTABLE_FRAMEBUFFER,
+                      BackbufferFormat(), frame->device_color_space);
   }
   DCHECK(texture->id());
 
   if (BindFramebufferToTexture(frame, texture)) {
     InitializeViewport(frame, render_pass->output_rect,
                        gfx::Rect(render_pass->output_rect.size()),
                        texture->size());
     return true;
   }
 
   return false;
 }
 
 bool DirectRenderer::HasAllocatedResourcesForTesting(int render_pass_id) const {
   auto iter = render_pass_textures_.find(render_pass_id);
   return iter != render_pass_textures_.end() && iter->second->id();
 }
 
 // static
 gfx::Size DirectRenderer::RenderPassTextureSize(const RenderPass* render_pass) {
   return render_pass->output_rect.size();
 }
 
 }  // namespace cc