Test X11 header pollution

content/common/gpu/media/rendering_helper.cc

Index: content/common/gpu/media/rendering_helper.cc
diff --git a/content/common/gpu/media/rendering_helper.cc b/content/common/gpu/media/rendering_helper.cc
deleted file mode 100644
index cabe3fbbf82b333a3768c88a0c020ab262d1f6ea..0000000000000000000000000000000000000000
--- a/content/common/gpu/media/rendering_helper.cc
+++ /dev/null
@@ -1,905 +0,0 @@
-// Copyright 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/common/gpu/media/rendering_helper.h"
-
-#include <string.h>
-
-#include <algorithm>
-#include <memory>
-#include <numeric>
-#include <vector>
-
-#include "base/bind.h"
-#include "base/callback_helpers.h"
-#include "base/command_line.h"
-#include "base/mac/scoped_nsautorelease_pool.h"
-#include "base/macros.h"
-#include "base/message_loop/message_loop.h"
-#include "base/run_loop.h"
-#include "base/strings/stringize_macros.h"
-#include "base/synchronization/waitable_event.h"
-#include "base/time/time.h"
-#include "build/build_config.h"
-#include "ui/gl/gl_context.h"
-#include "ui/gl/gl_implementation.h"
-#include "ui/gl/gl_surface.h"
-
-#if defined(OS_WIN)
-#include <windows.h>
-#endif
-
-#if defined(USE_X11)
-#include "ui/gfx/x/x11_types.h"
-#endif
-
-#if defined(ARCH_CPU_X86_FAMILY) && defined(USE_X11)
-#include "ui/gl/gl_surface_glx.h"
-#define GL_VARIANT_GLX 1
-#else
-#include "ui/gl/gl_surface_egl.h"
-#define GL_VARIANT_EGL 1
-#endif
-
-#if defined(USE_OZONE)
-#if defined(OS_CHROMEOS)
-#include "ui/display/chromeos/display_configurator.h"
-#include "ui/display/types/native_display_delegate.h"
-#endif  // defined(OS_CHROMEOS)
-#include "ui/ozone/public/ozone_platform.h"
-#include "ui/platform_window/platform_window.h"
-#include "ui/platform_window/platform_window_delegate.h"
-#endif  // defined(USE_OZONE)
-
-// Helper for Shader creation.
-static void CreateShader(GLuint program,
-                         GLenum type,
-                         const char* source,
-                         int size) {
-  GLuint shader = glCreateShader(type);
-  glShaderSource(shader, 1, &source, &size);
-  glCompileShader(shader);
-  int result = GL_FALSE;
-  glGetShaderiv(shader, GL_COMPILE_STATUS, &result);
-  if (!result) {
-    char log[4096];
-    glGetShaderInfoLog(shader, arraysize(log), NULL, log);
-    LOG(FATAL) << log;
-  }
-  glAttachShader(program, shader);
-  glDeleteShader(shader);
-  CHECK_EQ(static_cast<int>(glGetError()), GL_NO_ERROR);
-}
-
-namespace content {
-namespace {
-
-void WaitForSwapAck(const base::Closure& callback, gfx::SwapResult result) {
-  callback.Run();
-}
-
-}  // namespace
-
-#if defined(USE_OZONE)
-
-class DisplayConfiguratorObserver : public ui::DisplayConfigurator::Observer {
- public:
-  explicit DisplayConfiguratorObserver(base::RunLoop* loop) : loop_(loop) {}
-  ~DisplayConfiguratorObserver() override {}
-
- private:
-  // ui::DisplayConfigurator::Observer overrides:
-  void OnDisplayModeChanged(
-      const ui::DisplayConfigurator::DisplayStateList& outputs) override {
-    if (!loop_)
-      return;
-    loop_->Quit();
-    loop_ = nullptr;
-  }
-  void OnDisplayModeChangeFailed(
-      const ui::DisplayConfigurator::DisplayStateList& outputs,
-      ui::MultipleDisplayState failed_new_state) override {
-    LOG(FATAL) << "Could not configure display";
-  }
-
-  base::RunLoop* loop_;
-
-  DISALLOW_COPY_AND_ASSIGN(DisplayConfiguratorObserver);
-};
-
-class RenderingHelper::StubOzoneDelegate : public ui::PlatformWindowDelegate {
- public:
-  StubOzoneDelegate() : accelerated_widget_(gfx::kNullAcceleratedWidget) {
-    platform_window_ = ui::OzonePlatform::GetInstance()->CreatePlatformWindow(
-        this, gfx::Rect());
-  }
-  ~StubOzoneDelegate() override {}
-
-  void OnBoundsChanged(const gfx::Rect& new_bounds) override {}
-
-  void OnDamageRect(const gfx::Rect& damaged_region) override {}
-
-  void DispatchEvent(ui::Event* event) override {}
-
-  void OnCloseRequest() override {}
-  void OnClosed() override {}
-
-  void OnWindowStateChanged(ui::PlatformWindowState new_state) override {}
-
-  void OnLostCapture() override {};
-
-  void OnAcceleratedWidgetAvailable(gfx::AcceleratedWidget widget,
-                                    float device_pixel_ratio) override {
-    accelerated_widget_ = widget;
-  }
-
-  void OnAcceleratedWidgetDestroyed() override {
-    NOTREACHED();
-  }
-
-  void OnActivationChanged(bool active) override {};
-
-  gfx::AcceleratedWidget accelerated_widget() const {
-    return accelerated_widget_;
-  }
-
-  gfx::Size GetSize() { return platform_window_->GetBounds().size(); }
-
-  ui::PlatformWindow* platform_window() const { return platform_window_.get(); }
-
- private:
-  std::unique_ptr<ui::PlatformWindow> platform_window_;
-  gfx::AcceleratedWidget accelerated_widget_;
-
-  DISALLOW_COPY_AND_ASSIGN(StubOzoneDelegate);
-};
-
-#endif  // defined(USE_OZONE)
-
-RenderingHelperParams::RenderingHelperParams()
-    : rendering_fps(0), warm_up_iterations(0), render_as_thumbnails(false) {
-}
-
-RenderingHelperParams::RenderingHelperParams(
-    const RenderingHelperParams& other) = default;
-
-RenderingHelperParams::~RenderingHelperParams() {}
-
-VideoFrameTexture::VideoFrameTexture(uint32_t texture_target,
-                                     uint32_t texture_id,
-                                     const base::Closure& no_longer_needed_cb)
-    : texture_target_(texture_target),
-      texture_id_(texture_id),
-      no_longer_needed_cb_(no_longer_needed_cb) {
-  DCHECK(!no_longer_needed_cb_.is_null());
-}
-
-VideoFrameTexture::~VideoFrameTexture() {
-  base::ResetAndReturn(&no_longer_needed_cb_).Run();
-}
-
-RenderingHelper::RenderedVideo::RenderedVideo()
-    : is_flushing(false), frames_to_drop(0) {
-}
-
-RenderingHelper::RenderedVideo::RenderedVideo(const RenderedVideo& other) =
-    default;
-
-RenderingHelper::RenderedVideo::~RenderedVideo() {
-}
-
-// static
-void RenderingHelper::InitializeOneOff(base::WaitableEvent* done) {
-  base::CommandLine* cmd_line = base::CommandLine::ForCurrentProcess();
-#if GL_VARIANT_GLX
-  cmd_line->AppendSwitchASCII(switches::kUseGL,
-                              gfx::kGLImplementationDesktopName);
-#else
-  cmd_line->AppendSwitchASCII(switches::kUseGL, gfx::kGLImplementationEGLName);
-#endif
-
-  if (!gfx::GLSurface::InitializeOneOff())
-    LOG(FATAL) << "Could not initialize GL";
-  done->Signal();
-}
-
-RenderingHelper::RenderingHelper() : ignore_vsync_(false) {
-  window_ = gfx::kNullAcceleratedWidget;
-  Clear();
-}
-
-RenderingHelper::~RenderingHelper() {
-  CHECK_EQ(videos_.size(), 0U) << "Must call UnInitialize before dtor.";
-  Clear();
-}
-
-void RenderingHelper::Setup() {
-#if defined(OS_WIN)
-  window_ = CreateWindowEx(0,
-                           L"Static",
-                           L"VideoDecodeAcceleratorTest",
-                           WS_OVERLAPPEDWINDOW | WS_VISIBLE,
-                           0,
-                           0,
-                           GetSystemMetrics(SM_CXSCREEN),
-                           GetSystemMetrics(SM_CYSCREEN),
-                           NULL,
-                           NULL,
-                           NULL,
-                           NULL);
-#elif defined(USE_X11)
-  Display* display = gfx::GetXDisplay();
-  Screen* screen = DefaultScreenOfDisplay(display);
-
-  CHECK(display);
-
-  XSetWindowAttributes window_attributes;
-  memset(&window_attributes, 0, sizeof(window_attributes));
-  window_attributes.background_pixel =
-      BlackPixel(display, DefaultScreen(display));
-  window_attributes.override_redirect = true;
-  int depth = DefaultDepth(display, DefaultScreen(display));
-
-  window_ = XCreateWindow(display,
-                          DefaultRootWindow(display),
-                          0,
-                          0,
-                          XWidthOfScreen(screen),
-                          XHeightOfScreen(screen),
-                          0 /* border width */,
-                          depth,
-                          CopyFromParent /* class */,
-                          CopyFromParent /* visual */,
-                          (CWBackPixel | CWOverrideRedirect),
-                          &window_attributes);
-  XStoreName(display, window_, "VideoDecodeAcceleratorTest");
-  XSelectInput(display, window_, ExposureMask);
-  XMapWindow(display, window_);
-#elif defined(USE_OZONE)
-  base::MessageLoop::ScopedNestableTaskAllower nest_loop(
-      base::MessageLoop::current());
-  base::RunLoop wait_window_resize;
-
-  platform_window_delegate_.reset(new RenderingHelper::StubOzoneDelegate());
-  window_ = platform_window_delegate_->accelerated_widget();
-  gfx::Size window_size(800, 600);
-  // Ignore the vsync provider by default. On ChromeOS this will be set
-  // accordingly based on the display configuration.
-  ignore_vsync_ = true;
-#if defined(OS_CHROMEOS)
-  // We hold onto the main loop here to wait for the DisplayController
-  // to give us the size of the display so we can create a window of
-  // the same size.
-  base::RunLoop wait_display_setup;
-  DisplayConfiguratorObserver display_setup_observer(&wait_display_setup);
-  display_configurator_.reset(new ui::DisplayConfigurator());
-  display_configurator_->SetDelegateForTesting(0);
-  display_configurator_->AddObserver(&display_setup_observer);
-  display_configurator_->Init(
-      ui::OzonePlatform::GetInstance()->CreateNativeDisplayDelegate(),
-      true);
-  display_configurator_->ForceInitialConfigure(0);
-  // Make sure all the display configuration is applied.
-  wait_display_setup.Run();
-  display_configurator_->RemoveObserver(&display_setup_observer);
-
-  gfx::Size framebuffer_size = display_configurator_->framebuffer_size();
-  if (!framebuffer_size.IsEmpty()) {
-    window_size = framebuffer_size;
-    ignore_vsync_ = false;
-  }
-#endif
-  if (ignore_vsync_)
-    DVLOG(1) << "Ignoring vsync provider";
-
-  platform_window_delegate_->platform_window()->SetBounds(
-      gfx::Rect(window_size));
-
-  // On Ozone/DRI, platform windows are associated with the physical
-  // outputs. Association is achieved by matching the bounds of the
-  // window with the origin & modeset of the display output. Until a
-  // window is associated with a display output, we cannot get vsync
-  // events, because there is no hardware to get events from. Here we
-  // wait for the window to resized and therefore associated with
-  // display output to be sure that we will get such events.
-  wait_window_resize.RunUntilIdle();
-#else
-#error unknown platform
-#endif
-  CHECK(window_ != gfx::kNullAcceleratedWidget);
-}
-
-void RenderingHelper::TearDown() {
-#if defined(OS_WIN)
-  if (window_)
-    DestroyWindow(window_);
-#elif defined(USE_X11)
-  // Destroy resources acquired in Initialize, in reverse-acquisition order.
-  if (window_) {
-    CHECK(XUnmapWindow(gfx::GetXDisplay(), window_));
-    CHECK(XDestroyWindow(gfx::GetXDisplay(), window_));
-  }
-#elif defined(USE_OZONE)
-  platform_window_delegate_.reset();
-#if defined(OS_CHROMEOS)
-  display_configurator_->PrepareForExit();
-  display_configurator_.reset();
-#endif
-#endif
-  window_ = gfx::kNullAcceleratedWidget;
-}
-
-void RenderingHelper::Initialize(const RenderingHelperParams& params,
-                                 base::WaitableEvent* done) {
-  // Use videos_.size() != 0 as a proxy for the class having already been
-  // Initialize()'d, and UnInitialize() before continuing.
-  if (videos_.size()) {
-    base::WaitableEvent done(false, false);
-    UnInitialize(&done);
-    done.Wait();
-  }
-
-  render_task_.Reset(
-      base::Bind(&RenderingHelper::RenderContent, base::Unretained(this)));
-
-  frame_duration_ = params.rendering_fps > 0
-                        ? base::TimeDelta::FromSeconds(1) / params.rendering_fps
-                        : base::TimeDelta();
-
-  render_as_thumbnails_ = params.render_as_thumbnails;
-  message_loop_ = base::MessageLoop::current();
-
-  gl_surface_ = gfx::GLSurface::CreateViewGLSurface(window_);
-#if defined(USE_OZONE)
-  gl_surface_->Resize(platform_window_delegate_->GetSize(), 1.f, true);
-#endif  // defined(USE_OZONE)
-  screen_size_ = gl_surface_->GetSize();
-
-  gl_context_ = gfx::GLContext::CreateGLContext(
-      NULL, gl_surface_.get(), gfx::PreferIntegratedGpu);
-  CHECK(gl_context_->MakeCurrent(gl_surface_.get()));
-
-  CHECK_GT(params.window_sizes.size(), 0U);
-  videos_.resize(params.window_sizes.size());
-  LayoutRenderingAreas(params.window_sizes);
-
-  if (render_as_thumbnails_) {
-    CHECK_EQ(videos_.size(), 1U);
-
-    GLint max_texture_size;
-    glGetIntegerv(GL_MAX_TEXTURE_SIZE, &max_texture_size);
-    CHECK_GE(max_texture_size, params.thumbnails_page_size.width());
-    CHECK_GE(max_texture_size, params.thumbnails_page_size.height());
-
-    thumbnails_fbo_size_ = params.thumbnails_page_size;
-    thumbnail_size_ = params.thumbnail_size;
-
-    glGenFramebuffersEXT(1, &thumbnails_fbo_id_);
-    glGenTextures(1, &thumbnails_texture_id_);
-    glBindTexture(GL_TEXTURE_2D, thumbnails_texture_id_);
-    glTexImage2D(GL_TEXTURE_2D,
-                 0,
-                 GL_RGB,
-                 thumbnails_fbo_size_.width(),
-                 thumbnails_fbo_size_.height(),
-                 0,
-                 GL_RGB,
-                 GL_UNSIGNED_SHORT_5_6_5,
-                 NULL);
-    glTexParameteri(GL_TEXTURE_2D, GL_TEXTURE_WRAP_S, GL_CLAMP_TO_EDGE);
-    glTexParameteri(GL_TEXTURE_2D, GL_TEXTURE_WRAP_T, GL_CLAMP_TO_EDGE);
-    glTexParameteri(GL_TEXTURE_2D, GL_TEXTURE_MAG_FILTER, GL_LINEAR);
-    glTexParameteri(GL_TEXTURE_2D, GL_TEXTURE_MIN_FILTER, GL_LINEAR);
-    glBindTexture(GL_TEXTURE_2D, 0);
-
-    glBindFramebufferEXT(GL_FRAMEBUFFER, thumbnails_fbo_id_);
-    glFramebufferTexture2DEXT(GL_FRAMEBUFFER,
-                              GL_COLOR_ATTACHMENT0,
-                              GL_TEXTURE_2D,
-                              thumbnails_texture_id_,
-                              0);
-
-    GLenum fb_status = glCheckFramebufferStatusEXT(GL_FRAMEBUFFER);
-    CHECK(fb_status == GL_FRAMEBUFFER_COMPLETE) << fb_status;
-    glClearColor(0.0f, 0.0f, 0.0f, 1.0f);
-    glClear(GL_COLOR_BUFFER_BIT);
-    glBindFramebufferEXT(GL_FRAMEBUFFER,
-                         gl_surface_->GetBackingFrameBufferObject());
-  }
-
-  // These vertices and texture coords. map (0,0) in the texture to the
-  // bottom left of the viewport.  Since we get the video frames with the
-  // the top left at (0,0) we need to flip the texture y coordinate
-  // in the vertex shader for this to be rendered the right way up.
-  // In the case of thumbnail rendering we use the same vertex shader
-  // to render the FBO the screen, where we do not want this flipping.
-  static const float kVertices[] =
-      { -1.f, 1.f, -1.f, -1.f, 1.f, 1.f, 1.f, -1.f, };
-  static const float kTextureCoords[] = { 0, 1, 0, 0, 1, 1, 1, 0, };
-  static const char kVertexShader[] = STRINGIZE(
-      varying vec2 interp_tc;
-      attribute vec4 in_pos;
-      attribute vec2 in_tc;
-      uniform bool tex_flip;
-      void main() {
-        if (tex_flip)
-          interp_tc = vec2(in_tc.x, 1.0 - in_tc.y);
-        else
-          interp_tc = in_tc;
-        gl_Position = in_pos;
-      });
-
-#if GL_VARIANT_EGL
-  static const char kFragmentShader[] =
-      "#extension GL_OES_EGL_image_external : enable\n"
-      "precision mediump float;\n"
-      "varying vec2 interp_tc;\n"
-      "uniform sampler2D tex;\n"
-      "#ifdef GL_OES_EGL_image_external\n"
-      "uniform samplerExternalOES tex_external;\n"
-      "#endif\n"
-      "void main() {\n"
-      "  vec4 color = texture2D(tex, interp_tc);\n"
-      "#ifdef GL_OES_EGL_image_external\n"
-      "  color += texture2D(tex_external, interp_tc);\n"
-      "#endif\n"
-      "  gl_FragColor = color;\n"
-      "}\n";
-#else
-  static const char kFragmentShader[] = STRINGIZE(
-      varying vec2 interp_tc;
-      uniform sampler2D tex;
-      void main() {
-        gl_FragColor = texture2D(tex, interp_tc);
-      });
-#endif
-  program_ = glCreateProgram();
-  CreateShader(
-      program_, GL_VERTEX_SHADER, kVertexShader, arraysize(kVertexShader));
-  CreateShader(program_,
-               GL_FRAGMENT_SHADER,
-               kFragmentShader,
-               arraysize(kFragmentShader));
-  glLinkProgram(program_);
-  int result = GL_FALSE;
-  glGetProgramiv(program_, GL_LINK_STATUS, &result);
-  if (!result) {
-    char log[4096];
-    glGetShaderInfoLog(program_, arraysize(log), NULL, log);
-    LOG(FATAL) << log;
-  }
-  glUseProgram(program_);
-  glDeleteProgram(program_);
-
-  glUniform1i(glGetUniformLocation(program_, "tex_flip"), 0);
-  glUniform1i(glGetUniformLocation(program_, "tex"), 0);
-  GLint tex_external = glGetUniformLocation(program_, "tex_external");
-  if (tex_external != -1) {
-    glUniform1i(tex_external, 1);
-  }
-  int pos_location = glGetAttribLocation(program_, "in_pos");
-  glEnableVertexAttribArray(pos_location);
-  glVertexAttribPointer(pos_location, 2, GL_FLOAT, GL_FALSE, 0, kVertices);
-  int tc_location = glGetAttribLocation(program_, "in_tc");
-  glEnableVertexAttribArray(tc_location);
-  glVertexAttribPointer(tc_location, 2, GL_FLOAT, GL_FALSE, 0, kTextureCoords);
-
-  if (!frame_duration_.is_zero()) {
-    int warm_up_iterations = params.warm_up_iterations;
-#if defined(USE_OZONE)
-    // On Ozone the VSyncProvider can't provide a vsync interval until
-    // we render at least a frame, so we warm up with at least one
-    // frame.
-    // On top of this, we want to make sure all the buffers backing
-    // the GL surface are cleared, otherwise we can see the previous
-    // test's last frames, so we set warm up iterations to 2, to clear
-    // the front and back buffers.
-    warm_up_iterations = std::max(2, warm_up_iterations);
-#endif
-    WarmUpRendering(warm_up_iterations);
-  }
-
-  // It's safe to use Unretained here since |rendering_thread_| will be stopped
-  // in VideoDecodeAcceleratorTest.TearDown(), while the |rendering_helper_| is
-  // a member of that class. (See video_decode_accelerator_unittest.cc.)
-  gfx::VSyncProvider* vsync_provider = gl_surface_->GetVSyncProvider();
-
-  // VSync providers rely on the underlying CRTC to get the timing. In headless
-  // mode the surface isn't associated with a CRTC so the vsync provider can not
-  // get the timing, meaning it will not call UpdateVsyncParameters() ever.
-  if (!ignore_vsync_ && vsync_provider && !frame_duration_.is_zero()) {
-    vsync_provider->GetVSyncParameters(base::Bind(
-        &RenderingHelper::UpdateVSyncParameters, base::Unretained(this), done));
-  } else {
-    done->Signal();
-  }
-}
-
-// The rendering for the first few frames is slow (e.g., 100ms on Peach Pit).
-// This affects the numbers measured in the performance test. We try to render
-// several frames here to warm up the rendering.
-void RenderingHelper::WarmUpRendering(int warm_up_iterations) {
-  unsigned int texture_id;
-  std::unique_ptr<GLubyte[]> emptyData(
-      new GLubyte[screen_size_.GetArea() * 2]());
-  glGenTextures(1, &texture_id);
-  glBindTexture(GL_TEXTURE_2D, texture_id);
-  glTexImage2D(GL_TEXTURE_2D,
-               0,
-               GL_RGB,
-               screen_size_.width(),
-               screen_size_.height(),
-               0,
-               GL_RGB,
-               GL_UNSIGNED_SHORT_5_6_5,
-               emptyData.get());
-  for (int i = 0; i < warm_up_iterations; ++i) {
-    RenderTexture(GL_TEXTURE_2D, texture_id);
-
-    // Need to allow nestable tasks since WarmUpRendering() is called from
-    // within another task on the renderer thread.
-    base::MessageLoop::ScopedNestableTaskAllower allow(
-        base::MessageLoop::current());
-    base::RunLoop wait_for_swap_ack;
-    gl_surface_->SwapBuffersAsync(
-        base::Bind(&WaitForSwapAck, wait_for_swap_ack.QuitClosure()));
-    wait_for_swap_ack.Run();
-  }
-  glDeleteTextures(1, &texture_id);
-}
-
-void RenderingHelper::UnInitialize(base::WaitableEvent* done) {
-  CHECK_EQ(base::MessageLoop::current(), message_loop_);
-
-  render_task_.Cancel();
-
-  if (render_as_thumbnails_) {
-    glDeleteTextures(1, &thumbnails_texture_id_);
-    glDeleteFramebuffersEXT(1, &thumbnails_fbo_id_);
-  }
-
-  gl_context_->ReleaseCurrent(gl_surface_.get());
-  gl_context_ = NULL;
-  gl_surface_ = NULL;
-
-  Clear();
-  done->Signal();
-}
-
-void RenderingHelper::CreateTexture(uint32_t texture_target,
-                                    uint32_t* texture_id,
-                                    const gfx::Size& size,
-                                    base::WaitableEvent* done) {
-  if (base::MessageLoop::current() != message_loop_) {
-    message_loop_->PostTask(FROM_HERE,
-                            base::Bind(&RenderingHelper::CreateTexture,
-                                       base::Unretained(this),
-                                       texture_target,
-                                       texture_id,
-                                       size,
-                                       done));
-    return;
-  }
-  glGenTextures(1, texture_id);
-  glBindTexture(texture_target, *texture_id);
-  if (texture_target == GL_TEXTURE_2D) {
-    glTexImage2D(GL_TEXTURE_2D,
-                 0,
-                 GL_RGBA,
-                 size.width(),
-                 size.height(),
-                 0,
-                 GL_RGBA,
-                 GL_UNSIGNED_BYTE,
-                 NULL);
-  }
-  glTexParameteri(texture_target, GL_TEXTURE_MIN_FILTER, GL_LINEAR);
-  glTexParameteri(texture_target, GL_TEXTURE_MAG_FILTER, GL_LINEAR);
-  // OpenGLES2.0.25 section 3.8.2 requires CLAMP_TO_EDGE for NPOT textures.
-  glTexParameteri(texture_target, GL_TEXTURE_WRAP_S, GL_CLAMP_TO_EDGE);
-  glTexParameteri(texture_target, GL_TEXTURE_WRAP_T, GL_CLAMP_TO_EDGE);
-  CHECK_EQ(static_cast<int>(glGetError()), GL_NO_ERROR);
-  done->Signal();
-}
-
-// Helper function to set GL viewport.
-static inline void GLSetViewPort(const gfx::Rect& area) {
-  glViewport(area.x(), area.y(), area.width(), area.height());
-  glScissor(area.x(), area.y(), area.width(), area.height());
-}
-
-void RenderingHelper::RenderThumbnail(uint32_t texture_target,
-                                      uint32_t texture_id) {
-  CHECK_EQ(base::MessageLoop::current(), message_loop_);
-  const int width = thumbnail_size_.width();
-  const int height = thumbnail_size_.height();
-  const int thumbnails_in_row = thumbnails_fbo_size_.width() / width;
-  const int thumbnails_in_column = thumbnails_fbo_size_.height() / height;
-  const int row = (frame_count_ / thumbnails_in_row) % thumbnails_in_column;
-  const int col = frame_count_ % thumbnails_in_row;
-
-  gfx::Rect area(col * width, row * height, width, height);
-
-  glUniform1i(glGetUniformLocation(program_, "tex_flip"), 0);
-  glBindFramebufferEXT(GL_FRAMEBUFFER, thumbnails_fbo_id_);
-  GLSetViewPort(area);
-  RenderTexture(texture_target, texture_id);
-  glBindFramebufferEXT(GL_FRAMEBUFFER,
-                       gl_surface_->GetBackingFrameBufferObject());
-
-  // Need to flush the GL commands before we return the tnumbnail texture to
-  // the decoder.
-  glFlush();
-  ++frame_count_;
-}
-
-void RenderingHelper::QueueVideoFrame(
-    size_t window_id,
-    scoped_refptr<VideoFrameTexture> video_frame) {
-  CHECK_EQ(base::MessageLoop::current(), message_loop_);
-  RenderedVideo* video = &videos_[window_id];
-  DCHECK(!video->is_flushing);
-
-  video->pending_frames.push(video_frame);
-
-  if (video->frames_to_drop > 0 && video->pending_frames.size() > 1) {
-    --video->frames_to_drop;
-    video->pending_frames.pop();
-  }
-
-  // Schedules the first RenderContent() if need.
-  if (scheduled_render_time_.is_null()) {
-    scheduled_render_time_ = base::TimeTicks::Now();
-    message_loop_->PostTask(FROM_HERE, render_task_.callback());
-  }
-}
-
-void RenderingHelper::RenderTexture(uint32_t texture_target,
-                                    uint32_t texture_id) {
-  // The ExternalOES sampler is bound to GL_TEXTURE1 and the Texture2D sampler
-  // is bound to GL_TEXTURE0.
-  if (texture_target == GL_TEXTURE_2D) {
-    glActiveTexture(GL_TEXTURE0 + 0);
-  } else if (texture_target == GL_TEXTURE_EXTERNAL_OES) {
-    glActiveTexture(GL_TEXTURE0 + 1);
-  }
-  glBindTexture(texture_target, texture_id);
-  glDrawArrays(GL_TRIANGLE_STRIP, 0, 4);
-  glBindTexture(texture_target, 0);
-  CHECK_EQ(static_cast<int>(glGetError()), GL_NO_ERROR);
-}
-
-void RenderingHelper::DeleteTexture(uint32_t texture_id) {
-  CHECK_EQ(base::MessageLoop::current(), message_loop_);
-  glDeleteTextures(1, &texture_id);
-  CHECK_EQ(static_cast<int>(glGetError()), GL_NO_ERROR);
-}
-
-gfx::GLContext* RenderingHelper::GetGLContext() {
-  return gl_context_.get();
-}
-
-void* RenderingHelper::GetGLDisplay() {
-  return gl_surface_->GetDisplay();
-}
-
-void RenderingHelper::Clear() {
-  videos_.clear();
-  message_loop_ = NULL;
-  gl_context_ = NULL;
-  gl_surface_ = NULL;
-
-  render_as_thumbnails_ = false;
-  frame_count_ = 0;
-  thumbnails_fbo_id_ = 0;
-  thumbnails_texture_id_ = 0;
-}
-
-void RenderingHelper::GetThumbnailsAsRGB(std::vector<unsigned char>* rgb,
-                                         bool* alpha_solid,
-                                         base::WaitableEvent* done) {
-  CHECK(render_as_thumbnails_);
-
-  const size_t num_pixels = thumbnails_fbo_size_.GetArea();
-  std::vector<unsigned char> rgba;
-  rgba.resize(num_pixels * 4);
-  glBindFramebufferEXT(GL_FRAMEBUFFER, thumbnails_fbo_id_);
-  glPixelStorei(GL_PACK_ALIGNMENT, 1);
-  // We can only count on GL_RGBA/GL_UNSIGNED_BYTE support.
-  glReadPixels(0,
-               0,
-               thumbnails_fbo_size_.width(),
-               thumbnails_fbo_size_.height(),
-               GL_RGBA,
-               GL_UNSIGNED_BYTE,
-               &rgba[0]);
-  glBindFramebufferEXT(GL_FRAMEBUFFER,
-                       gl_surface_->GetBackingFrameBufferObject());
-  rgb->resize(num_pixels * 3);
-  // Drop the alpha channel, but check as we go that it is all 0xff.
-  bool solid = true;
-  unsigned char* rgb_ptr = &((*rgb)[0]);
-  unsigned char* rgba_ptr = &rgba[0];
-  for (size_t i = 0; i < num_pixels; ++i) {
-    *rgb_ptr++ = *rgba_ptr++;
-    *rgb_ptr++ = *rgba_ptr++;
-    *rgb_ptr++ = *rgba_ptr++;
-    solid = solid && (*rgba_ptr == 0xff);
-    rgba_ptr++;
-  }
-  *alpha_solid = solid;
-
-  done->Signal();
-}
-
-void RenderingHelper::Flush(size_t window_id) {
-  videos_[window_id].is_flushing = true;
-}
-
-void RenderingHelper::RenderContent() {
-  CHECK_EQ(base::MessageLoop::current(), message_loop_);
-
-  // Update the VSync params.
-  //
-  // It's safe to use Unretained here since |rendering_thread_| will be stopped
-  // in VideoDecodeAcceleratorTest.TearDown(), while the |rendering_helper_| is
-  // a member of that class. (See video_decode_accelerator_unittest.cc.)
-  gfx::VSyncProvider* vsync_provider = gl_surface_->GetVSyncProvider();
-  if (vsync_provider && !ignore_vsync_) {
-    vsync_provider->GetVSyncParameters(base::Bind(
-        &RenderingHelper::UpdateVSyncParameters, base::Unretained(this),
-        static_cast<base::WaitableEvent*>(NULL)));
-  }
-
-  int tex_flip = 1;
-#if defined(USE_OZONE)
-  // Ozone surfaceless renders flipped from normal GL, so there's no need to
-  // do an extra flip.
-  tex_flip = 0;
-#endif  // defined(USE_OZONE)
-  glUniform1i(glGetUniformLocation(program_, "tex_flip"), tex_flip);
-
-  // Frames that will be returned to the client (via the no_longer_needed_cb)
-  // after this vector falls out of scope at the end of this method. We need
-  // to keep references to them until after SwapBuffers() call below.
-  std::vector<scoped_refptr<VideoFrameTexture> > frames_to_be_returned;
-  bool need_swap_buffer = false;
-  if (render_as_thumbnails_) {
-    // In render_as_thumbnails_ mode, we render the FBO content on the
-    // screen instead of the decoded textures.
-    GLSetViewPort(videos_[0].render_area);
-    RenderTexture(GL_TEXTURE_2D, thumbnails_texture_id_);
-    need_swap_buffer = true;
-  } else {
-    for (RenderedVideo& video : videos_) {
-      if (video.pending_frames.empty())
-        continue;
-      need_swap_buffer = true;
-      scoped_refptr<VideoFrameTexture> frame = video.pending_frames.front();
-      GLSetViewPort(video.render_area);
-      RenderTexture(frame->texture_target(), frame->texture_id());
-
-      if (video.pending_frames.size() > 1 || video.is_flushing) {
-        frames_to_be_returned.push_back(video.pending_frames.front());
-        video.pending_frames.pop();
-      } else {
-        ++video.frames_to_drop;
-      }
-    }
-  }
-
-  base::Closure schedule_frame = base::Bind(
-      &RenderingHelper::ScheduleNextRenderContent, base::Unretained(this));
-  if (!need_swap_buffer) {
-    schedule_frame.Run();
-    return;
-  }
-
-  gl_surface_->SwapBuffersAsync(
-          base::Bind(&WaitForSwapAck, schedule_frame));
-}
-
-// Helper function for the LayoutRenderingAreas(). The |lengths| are the
-// heights(widths) of the rows(columns). It scales the elements in
-// |lengths| proportionally so that the sum of them equal to |total_length|.
-// It also outputs the coordinates of the rows(columns) to |offsets|.
-static void ScaleAndCalculateOffsets(std::vector<int>* lengths,
-                                     std::vector<int>* offsets,
-                                     int total_length) {
-  int sum = std::accumulate(lengths->begin(), lengths->end(), 0);
-  for (size_t i = 0; i < lengths->size(); ++i) {
-    lengths->at(i) = lengths->at(i) * total_length / sum;
-    offsets->at(i) = (i == 0) ? 0 : offsets->at(i - 1) + lengths->at(i - 1);
-  }
-}
-
-void RenderingHelper::LayoutRenderingAreas(
-    const std::vector<gfx::Size>& window_sizes) {
-  // Find the number of colums and rows.
-  // The smallest n * n or n * (n + 1) > number of windows.
-  size_t cols = sqrt(videos_.size() - 1) + 1;
-  size_t rows = (videos_.size() + cols - 1) / cols;
-
-  // Find the widths and heights of the grid.
-  std::vector<int> widths(cols);
-  std::vector<int> heights(rows);
-  std::vector<int> offset_x(cols);
-  std::vector<int> offset_y(rows);
-
-  for (size_t i = 0; i < window_sizes.size(); ++i) {
-    const gfx::Size& size = window_sizes[i];
-    widths[i % cols] = std::max(widths[i % cols], size.width());
-    heights[i / cols] = std::max(heights[i / cols], size.height());
-  }
-
-  ScaleAndCalculateOffsets(&widths, &offset_x, screen_size_.width());
-  ScaleAndCalculateOffsets(&heights, &offset_y, screen_size_.height());
-
-  // Put each render_area_ in the center of each cell.
-  for (size_t i = 0; i < window_sizes.size(); ++i) {
-    const gfx::Size& size = window_sizes[i];
-    float scale =
-        std::min(static_cast<float>(widths[i % cols]) / size.width(),
-                 static_cast<float>(heights[i / cols]) / size.height());
-
-    // Don't scale up the texture.
-    scale = std::min(1.0f, scale);
-
-    size_t w = scale * size.width();
-    size_t h = scale * size.height();
-    size_t x = offset_x[i % cols] + (widths[i % cols] - w) / 2;
-    size_t y = offset_y[i / cols] + (heights[i / cols] - h) / 2;
-    videos_[i].render_area = gfx::Rect(x, y, w, h);
-  }
-}
-
-void RenderingHelper::UpdateVSyncParameters(base::WaitableEvent* done,
-                                            const base::TimeTicks timebase,
-                                            const base::TimeDelta interval) {
-  vsync_timebase_ = timebase;
-  vsync_interval_ = interval;
-
-  if (done)
-    done->Signal();
-}
-
-void RenderingHelper::DropOneFrameForAllVideos() {
-  for (RenderedVideo& video : videos_) {
-    if (video.pending_frames.empty())
-      continue;
-
-    if (video.pending_frames.size() > 1 || video.is_flushing) {
-      video.pending_frames.pop();
-    } else {
-      ++video.frames_to_drop;
-    }
-  }
-}
-
-void RenderingHelper::ScheduleNextRenderContent() {
-  scheduled_render_time_ += frame_duration_;
-  base::TimeTicks now = base::TimeTicks::Now();
-  base::TimeTicks target;
-
-  if (vsync_interval_.is_zero()) {
-    target = std::max(now, scheduled_render_time_);
-  } else {
-    // Schedules the next RenderContent() at latest VSYNC before the
-    // |scheduled_render_time_|.
-    target = std::max(now + vsync_interval_, scheduled_render_time_);
-
-    int64_t intervals = (target - vsync_timebase_) / vsync_interval_;
-    target = vsync_timebase_ + intervals * vsync_interval_;
-  }
-
-  // When the rendering falls behind, drops frames.
-  while (scheduled_render_time_ < target) {
-    scheduled_render_time_ += frame_duration_;
-    DropOneFrameForAllVideos();
-  }
-
-  message_loop_->PostDelayedTask(
-      FROM_HERE, render_task_.callback(), target - now);
-}
-}  // namespace content