Revert of Introduce components/display_compositor

content/browser/compositor/buffer_queue.cc

Index: content/browser/compositor/buffer_queue.cc
diff --git a/content/browser/compositor/buffer_queue.cc b/content/browser/compositor/buffer_queue.cc
new file mode 100644
index 0000000000000000000000000000000000000000..c1a0340ef827cd7ac492bba48800b0d329653401
--- /dev/null
+++ b/content/browser/compositor/buffer_queue.cc
@@ -0,0 +1,265 @@
+// Copyright 2014 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/compositor/buffer_queue.h"
+
+#include "base/containers/adapters.h"
+#include "base/memory/ptr_util.h"
+#include "build/build_config.h"
+#include "cc/output/context_provider.h"
+#include "content/browser/compositor/gl_helper.h"
+#include "gpu/GLES2/gl2extchromium.h"
+#include "gpu/command_buffer/client/gles2_interface.h"
+#include "gpu/command_buffer/client/gpu_memory_buffer_manager.h"
+#include "gpu/command_buffer/common/gpu_memory_buffer_support.h"
+#include "third_party/skia/include/core/SkRect.h"
+#include "third_party/skia/include/core/SkRegion.h"
+#include "ui/gfx/gpu_memory_buffer.h"
+#include "ui/gfx/skia_util.h"
+
+namespace content {
+
+BufferQueue::BufferQueue(scoped_refptr<cc::ContextProvider> context_provider,
+                         unsigned int texture_target,
+                         unsigned int internalformat,
+                         GLHelper* gl_helper,
+                         gpu::GpuMemoryBufferManager* gpu_memory_buffer_manager,
+                         int surface_id)
+    : context_provider_(context_provider),
+      fbo_(0),
+      allocated_count_(0),
+      texture_target_(texture_target),
+      internal_format_(internalformat),
+      gl_helper_(gl_helper),
+      gpu_memory_buffer_manager_(gpu_memory_buffer_manager),
+      surface_id_(surface_id) {}
+
+BufferQueue::~BufferQueue() {
+  FreeAllSurfaces();
+
+  gpu::gles2::GLES2Interface* gl = context_provider_->ContextGL();
+  if (fbo_)
+    gl->DeleteFramebuffers(1, &fbo_);
+}
+
+void BufferQueue::Initialize() {
+  gpu::gles2::GLES2Interface* gl = context_provider_->ContextGL();
+  gl->GenFramebuffers(1, &fbo_);
+}
+
+void BufferQueue::BindFramebuffer() {
+  gpu::gles2::GLES2Interface* gl = context_provider_->ContextGL();
+  gl->BindFramebuffer(GL_FRAMEBUFFER, fbo_);
+
+  if (!current_surface_)
+    current_surface_ = GetNextSurface();
+
+  if (current_surface_) {
+    gl->FramebufferTexture2D(GL_FRAMEBUFFER, GL_COLOR_ATTACHMENT0,
+                             texture_target_, current_surface_->texture, 0);
+  }
+}
+
+void BufferQueue::CopyBufferDamage(int texture,
+                                   int source_texture,
+                                   const gfx::Rect& new_damage,
+                                   const gfx::Rect& old_damage) {
+  gl_helper_->CopySubBufferDamage(
+      texture_target_, texture, source_texture,
+      SkRegion(gfx::RectToSkIRect(new_damage)),
+      SkRegion(gfx::RectToSkIRect(old_damage)));
+}
+
+void BufferQueue::UpdateBufferDamage(const gfx::Rect& damage) {
+  if (displayed_surface_)
+    displayed_surface_->damage.Union(damage);
+  for (auto& surface : available_surfaces_)
+    surface->damage.Union(damage);
+  for (auto& surface : in_flight_surfaces_) {
+    if (surface)
+      surface->damage.Union(damage);
+  }
+}
+
+void BufferQueue::SwapBuffers(const gfx::Rect& damage) {
+  if (current_surface_) {
+    if (damage != gfx::Rect(size_)) {
+      // Copy damage from the most recently swapped buffer. In the event that
+      // the buffer was destroyed and failed to recreate, pick from the most
+      // recently available buffer.
+      unsigned int texture_id = 0;
+      for (auto& surface : base::Reversed(in_flight_surfaces_)) {
+        if (surface) {
+          texture_id = surface->texture;
+          break;
+        }
+      }
+      if (!texture_id && displayed_surface_)
+        texture_id = displayed_surface_->texture;
+
+      if (texture_id) {
+        CopyBufferDamage(current_surface_->texture, texture_id, damage,
+                         current_surface_->damage);
+      }
+    }
+    current_surface_->damage = gfx::Rect();
+  }
+  UpdateBufferDamage(damage);
+  in_flight_surfaces_.push_back(std::move(current_surface_));
+  // Some things reset the framebuffer (CopySubBufferDamage, some GLRenderer
+  // paths), so ensure we restore it here.
+  context_provider_->ContextGL()->BindFramebuffer(GL_FRAMEBUFFER, fbo_);
+}
+
+void BufferQueue::Reshape(const gfx::Size& size, float scale_factor) {
+  if (size == size_)
+    return;
+  // TODO(ccameron): This assert is being hit on Mac try jobs. Determine if that
+  // is cause for concern or if it is benign.
+  // http://crbug.com/524624
+#if !defined(OS_MACOSX)
+  DCHECK(!current_surface_);
+#endif
+  size_ = size;
+
+  // TODO: add stencil buffer when needed.
+  gpu::gles2::GLES2Interface* gl = context_provider_->ContextGL();
+  gl->BindFramebuffer(GL_FRAMEBUFFER, fbo_);
+  gl->FramebufferTexture2D(GL_FRAMEBUFFER, GL_COLOR_ATTACHMENT0,
+                           texture_target_, 0, 0);
+
+  FreeAllSurfaces();
+}
+
+void BufferQueue::RecreateBuffers() {
+  // We need to recreate the buffers, for whatever reason the old ones are not
+  // presentable on the device anymore.
+  // Unused buffers can be freed directly, they will be re-allocated as needed.
+  // Any in flight, current or displayed surface must be replaced.
+  available_surfaces_.clear();
+
+  // Recreate all in-flight surfaces and put the recreated copies in the queue.
+  for (auto& surface : in_flight_surfaces_)
+    surface = RecreateBuffer(std::move(surface));
+
+  current_surface_ = RecreateBuffer(std::move(current_surface_));
+  displayed_surface_ = RecreateBuffer(std::move(displayed_surface_));
+
+  if (current_surface_) {
+    // If we have a texture bound, we will need to re-bind it.
+    gpu::gles2::GLES2Interface* gl = context_provider_->ContextGL();
+    gl->BindFramebuffer(GL_FRAMEBUFFER, fbo_);
+    gl->FramebufferTexture2D(GL_FRAMEBUFFER, GL_COLOR_ATTACHMENT0,
+                             texture_target_, current_surface_->texture, 0);
+  }
+}
+
+std::unique_ptr<BufferQueue::AllocatedSurface> BufferQueue::RecreateBuffer(
+    std::unique_ptr<AllocatedSurface> surface) {
+  if (!surface)
+    return nullptr;
+
+  std::unique_ptr<AllocatedSurface> new_surface(GetNextSurface());
+  if (!new_surface)
+    return nullptr;
+
+  new_surface->damage = surface->damage;
+
+  // Copy the entire texture.
+  CopyBufferDamage(new_surface->texture, surface->texture, gfx::Rect(),
+                   gfx::Rect(size_));
+  return new_surface;
+}
+
+void BufferQueue::PageFlipComplete() {
+  DCHECK(!in_flight_surfaces_.empty());
+  if (displayed_surface_)
+    available_surfaces_.push_back(std::move(displayed_surface_));
+  displayed_surface_ = std::move(in_flight_surfaces_.front());
+  in_flight_surfaces_.pop_front();
+}
+
+void BufferQueue::FreeAllSurfaces() {
+  displayed_surface_.reset();
+  current_surface_.reset();
+  // This is intentionally not emptied since the swap buffers acks are still
+  // expected to arrive.
+  for (auto& surface : in_flight_surfaces_)
+    surface = nullptr;
+  available_surfaces_.clear();
+}
+
+void BufferQueue::FreeSurfaceResources(AllocatedSurface* surface) {
+  if (!surface->texture)
+    return;
+
+  gpu::gles2::GLES2Interface* gl = context_provider_->ContextGL();
+  gl->BindTexture(texture_target_, surface->texture);
+  gl->ReleaseTexImage2DCHROMIUM(texture_target_, surface->image);
+  gl->DeleteTextures(1, &surface->texture);
+  gl->DestroyImageCHROMIUM(surface->image);
+  surface->buffer.reset();
+  allocated_count_--;
+}
+
+std::unique_ptr<BufferQueue::AllocatedSurface> BufferQueue::GetNextSurface() {
+  if (!available_surfaces_.empty()) {
+    std::unique_ptr<AllocatedSurface> surface =
+        std::move(available_surfaces_.back());
+    available_surfaces_.pop_back();
+    return surface;
+  }
+
+  unsigned int texture = 0;
+  gpu::gles2::GLES2Interface* gl = context_provider_->ContextGL();
+  gl->GenTextures(1, &texture);
+  if (!texture)
+    return nullptr;
+
+  // We don't want to allow anything more than triple buffering.
+  DCHECK_LT(allocated_count_, 4U);
+
+  std::unique_ptr<gfx::GpuMemoryBuffer> buffer(
+      gpu_memory_buffer_manager_->AllocateGpuMemoryBuffer(
+          size_, gpu::DefaultBufferFormatForImageFormat(internal_format_),
+          gfx::BufferUsage::SCANOUT, surface_id_));
+  if (!buffer.get()) {
+    gl->DeleteTextures(1, &texture);
+    DLOG(ERROR) << "Failed to allocate GPU memory buffer";
+    return nullptr;
+  }
+
+  unsigned int id = gl->CreateImageCHROMIUM(
+      buffer->AsClientBuffer(), size_.width(), size_.height(),
+      internal_format_);
+  if (!id) {
+    LOG(ERROR) << "Failed to allocate backing image surface";
+    gl->DeleteTextures(1, &texture);
+    return nullptr;
+  }
+
+  allocated_count_++;
+  gl->BindTexture(texture_target_, texture);
+  gl->BindTexImage2DCHROMIUM(texture_target_, id);
+  return base::WrapUnique(new AllocatedSurface(this, std::move(buffer), texture,
+                                               id, gfx::Rect(size_)));
+}
+
+BufferQueue::AllocatedSurface::AllocatedSurface(
+    BufferQueue* buffer_queue,
+    std::unique_ptr<gfx::GpuMemoryBuffer> buffer,
+    unsigned int texture,
+    unsigned int image,
+    const gfx::Rect& rect)
+    : buffer_queue(buffer_queue),
+      buffer(buffer.release()),
+      texture(texture),
+      image(image),
+      damage(rect) {}
+
+BufferQueue::AllocatedSurface::~AllocatedSurface() {
+  buffer_queue->FreeSurfaceResources(this);
+}
+
+}  // namespace content