Simplify IOSurface CoreAnimation code: Part 2

content/browser/renderer_host/compositing_iosurface_context_mac.mm

Index: content/browser/renderer_host/compositing_iosurface_context_mac.mm
diff --git a/content/browser/renderer_host/compositing_iosurface_context_mac.mm b/content/browser/renderer_host/compositing_iosurface_context_mac.mm
deleted file mode 100644
index 5f0979293b3ce92007d012a36dd041f33e37b4be..0000000000000000000000000000000000000000
--- a/content/browser/renderer_host/compositing_iosurface_context_mac.mm
+++ /dev/null
@@ -1,135 +0,0 @@
-// Copyright (c) 2013 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 "content/browser/renderer_host/compositing_iosurface_context_mac.h"
-
-#include <OpenGL/gl.h>
-#include <OpenGL/OpenGL.h>
-#include <vector>
-
-#include "base/command_line.h"
-#include "base/debug/trace_event.h"
-#include "base/logging.h"
-#include "content/browser/gpu/gpu_data_manager_impl.h"
-#include "ui/base/ui_base_switches.h"
-#include "ui/gl/gl_switches.h"
-#include "ui/gl/gpu_switching_manager.h"
-
-namespace content {
-
-// static
-scoped_refptr<CompositingIOSurfaceContext>
-CompositingIOSurfaceContext::Get(int window_number) {
-  TRACE_EVENT0("browser", "CompositingIOSurfaceContext::Get");
-
-  // Return the context for this window_number, if it exists.
-  WindowMap::iterator found = window_map()->find(window_number);
-  if (found != window_map()->end()) {
-    DCHECK(!found->second->poisoned_);
-    return found->second;
-  }
-
-  base::ScopedTypeRef<CGLContextObj> cgl_context_strong;
-  CGLContextObj cgl_context = NULL;
-  CGLError error = kCGLNoError;
-
-  // Create the pixel format object for the context.
-  std::vector<CGLPixelFormatAttribute> attribs;
-  attribs.push_back(kCGLPFADepthSize);
-  attribs.push_back(static_cast<CGLPixelFormatAttribute>(0));
-  if (ui::GpuSwitchingManager::GetInstance()->SupportsDualGpus()) {
-    attribs.push_back(kCGLPFAAllowOfflineRenderers);
-    attribs.push_back(static_cast<CGLPixelFormatAttribute>(1));
-  }
-  attribs.push_back(static_cast<CGLPixelFormatAttribute>(0));
-  GLint number_virtual_screens = 0;
-  base::ScopedTypeRef<CGLPixelFormatObj> pixel_format;
-  error = CGLChoosePixelFormat(&attribs.front(),
-                               pixel_format.InitializeInto(),
-                               &number_virtual_screens);
-  if (error != kCGLNoError) {
-    LOG(ERROR) << "Failed to create pixel format object.";
-    return NULL;
-  }
-
-  // Create all contexts in the same share group so that the textures don't
-  // need to be recreated when transitioning contexts.
-  CGLContextObj share_context = NULL;
-  if (!window_map()->empty())
-    share_context = window_map()->begin()->second->cgl_context();
-  error = CGLCreateContext(
-      pixel_format, share_context, cgl_context_strong.InitializeInto());
-  if (error != kCGLNoError) {
-    LOG(ERROR) << "Failed to create context object.";
-    return NULL;
-  }
-  cgl_context = cgl_context_strong;
-
-  // Note that VSync is ignored because CoreAnimation will automatically
-  // rate limit draws.
-
-  return new CompositingIOSurfaceContext(
-      window_number,
-      cgl_context_strong,
-      cgl_context);
-}
-
-void CompositingIOSurfaceContext::PoisonContextAndSharegroup() {
-  if (poisoned_)
-    return;
-
-  for (WindowMap::iterator it = window_map()->begin();
-       it != window_map()->end();
-       ++it) {
-    it->second->poisoned_ = true;
-  }
-  window_map()->clear();
-}
-
-CompositingIOSurfaceContext::CompositingIOSurfaceContext(
-    int window_number,
-    base::ScopedTypeRef<CGLContextObj> cgl_context_strong,
-    CGLContextObj cgl_context)
-    : window_number_(window_number),
-      cgl_context_strong_(cgl_context_strong),
-      cgl_context_(cgl_context),
-      poisoned_(false) {
-  DCHECK(window_map()->find(window_number_) == window_map()->end());
-  window_map()->insert(std::make_pair(window_number_, this));
-
-  GpuDataManager::GetInstance()->AddObserver(this);
-}
-
-CompositingIOSurfaceContext::~CompositingIOSurfaceContext() {
-  GpuDataManager::GetInstance()->RemoveObserver(this);
-
-  if (!poisoned_) {
-    DCHECK(window_map()->find(window_number_) != window_map()->end());
-    DCHECK(window_map()->find(window_number_)->second == this);
-    window_map()->erase(window_number_);
-  } else {
-    WindowMap::const_iterator found = window_map()->find(window_number_);
-    if (found != window_map()->end())
-      DCHECK(found->second != this);
-  }
-}
-
-void CompositingIOSurfaceContext::OnGpuSwitching() {
-  // Recreate all browser-side GL contexts whenever the GPU switches. If this
-  // is not done, performance will suffer.
-  // http://crbug.com/361493
-  PoisonContextAndSharegroup();
-}
-
-// static
-CompositingIOSurfaceContext::WindowMap*
-    CompositingIOSurfaceContext::window_map() {
-  return window_map_.Pointer();
-}
-
-// static
-base::LazyInstance<CompositingIOSurfaceContext::WindowMap>
-    CompositingIOSurfaceContext::window_map_;
-
-}  // namespace content