Revert of [Reland 1] Pepper takes ownership of a mailbox before passing it to the texture layer.

gpu/command_buffer/service/gles2_cmd_decoder.cc

 // Copyright (c) 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 "gpu/command_buffer/service/gles2_cmd_decoder.h"
 
 #include <limits.h>
 #include <stddef.h>
 #include <stdint.h>
 #include <stdio.h>
@@ skipping 575 matching lines @@
 
   // Overridden from GLES2Decoder.
   bool Initialize(const scoped_refptr<gfx::GLSurface>& surface,
                   const scoped_refptr<gfx::GLContext>& context,
                   bool offscreen,
                   const gfx::Size& offscreen_size,
                   const DisallowedFeatures& disallowed_features,
                   const std::vector<int32_t>& attribs) override;
   void Destroy(bool have_context) override;
   void SetSurface(const scoped_refptr<gfx::GLSurface>& surface) override;
-  void TakeFrontBuffer(const Mailbox& mailbox) override;
-  void ReturnFrontBuffer(const Mailbox& mailbox, bool is_lost) override;
+  void ProduceFrontBuffer(const Mailbox& mailbox) override;
   bool ResizeOffscreenFrameBuffer(const gfx::Size& size) override;
   void UpdateParentTextureInfo();
   bool MakeCurrent() override;
   GLES2Util* GetGLES2Util() override { return &util_; }
   gfx::GLContext* GetGLContext() override { return context_.get(); }
   ContextGroup* GetContextGroup() override { return group_.get(); }
   Capabilities GetCapabilities() override;
   void RestoreState(const ContextState* prev_state) override;
 
   void RestoreActiveTexture() const override { state_.RestoreActiveTexture(); }
@@ skipping 1393 matching lines @@
   GLenum offscreen_target_stencil_format_;
   GLsizei offscreen_target_samples_;
   GLboolean offscreen_target_buffer_preserved_;
 
   // The copy that is saved when SwapBuffers is called.
   std::unique_ptr<BackFramebuffer> offscreen_saved_frame_buffer_;
   std::unique_ptr<BackTexture> offscreen_saved_color_texture_;
   scoped_refptr<TextureRef>
       offscreen_saved_color_texture_info_;
 
-  // When a client requests ownership of the swapped front buffer, all
-  // information is saved in this structure, and |in_use| is set to true. When a
-  // client releases ownership, |in_use| is set to false.
-  //
-  // An instance of this struct, with |in_use| = false may be reused instead of
-  // making a new BackTexture.
-  struct SavedBackTexture {
-    std::unique_ptr<BackTexture> back_texture;
-    scoped_refptr<TextureRef> texture_ref;
-    bool in_use;
-  };
-  std::vector<SavedBackTexture> saved_back_textures_;
-
-  // If there's a SavedBackTexture that's not in use, takes that. Otherwise,
-  // generates a new back texture.
-  void CreateBackTexture();
-  size_t create_back_texture_count_for_test_ = 0;
-
-  // Releases all saved BackTextures that are not in use by a client.
-  void ReleaseNotInUseBackTextures();
-
-  // Releases all saved BackTextures.
-  void ReleaseAllBackTextures();
-
-  size_t GetSavedBackTextureCountForTest() override;
-  size_t GetCreatedBackTextureCountForTest() override;
-
   // The copy that is used as the destination for multi-sample resolves.
   std::unique_ptr<BackFramebuffer> offscreen_resolved_frame_buffer_;
   std::unique_ptr<BackTexture> offscreen_resolved_color_texture_;
   GLenum offscreen_saved_color_format_;
 
   std::unique_ptr<QueryManager> query_manager_;
 
   std::unique_ptr<VertexArrayManager> vertex_array_manager_;
 
   std::unique_ptr<ImageManager> image_manager_;
@@ skipping 2054 matching lines @@
   framebuffer_state_.bound_draw_framebuffer = NULL;
   state_.bound_renderbuffer = NULL;
 
   if (offscreen_saved_color_texture_info_.get()) {
     DCHECK(offscreen_target_color_texture_);
     DCHECK_EQ(offscreen_saved_color_texture_info_->service_id(),
               offscreen_saved_color_texture_->id());
     offscreen_saved_color_texture_->Invalidate();
     offscreen_saved_color_texture_info_ = NULL;
   }
-  ReleaseAllBackTextures();
   if (have_context) {
     if (copy_texture_CHROMIUM_.get()) {
       copy_texture_CHROMIUM_->Destroy();
       copy_texture_CHROMIUM_.reset();
     }
 
     clear_framebuffer_blit_.reset();
 
     if (state_.current_program.get()) {
       program_manager()->UnuseProgram(shader_manager(),
@@ skipping 118 matching lines @@
 }
 
 void GLES2DecoderImpl::SetSurface(
     const scoped_refptr<gfx::GLSurface>& surface) {
   DCHECK(context_->IsCurrent(NULL));
   DCHECK(surface_.get());
   surface_ = surface;
   RestoreCurrentFramebufferBindings();
 }
 
-void GLES2DecoderImpl::TakeFrontBuffer(const Mailbox& mailbox) {
+void GLES2DecoderImpl::ProduceFrontBuffer(const Mailbox& mailbox) {
   if (!offscreen_saved_color_texture_.get()) {
-    DLOG(ERROR) << "Called TakeFrontBuffer on a non-offscreen context";
+    LOG(ERROR) << "Called ProduceFrontBuffer on a non-offscreen context";
     return;
   }
-
   if (!offscreen_saved_color_texture_info_.get()) {
     GLuint service_id = offscreen_saved_color_texture_->id();
     offscreen_saved_color_texture_info_ = TextureRef::Create(
         texture_manager(), 0, service_id);
     texture_manager()->SetTarget(offscreen_saved_color_texture_info_.get(),
                                  GL_TEXTURE_2D);
     UpdateParentTextureInfo();
   }
-
   mailbox_manager()->ProduceTexture(
       mailbox, offscreen_saved_color_texture_info_->texture());
-
-  // Save the BackTexture and TextureRef.
-  SavedBackTexture save;
-  save.back_texture.swap(offscreen_saved_color_texture_);
-  save.texture_ref = offscreen_saved_color_texture_info_;
-  offscreen_saved_color_texture_info_ = nullptr;
-  save.in_use = true;
-  saved_back_textures_.push_back(std::move(save));
-
-  CreateBackTexture();
-}
-
-void GLES2DecoderImpl::ReturnFrontBuffer(const Mailbox& mailbox, bool is_lost) {
-  Texture* texture = mailbox_manager()->ConsumeTexture(mailbox);
-  for (auto it = saved_back_textures_.begin(); it != saved_back_textures_.end();
-       ++it) {
-    if (texture != it->texture_ref->texture())
-      continue;
-
-    if (is_lost || it->back_texture->size() != offscreen_size_) {
-      it->back_texture->Invalidate();
-      saved_back_textures_.erase(it);
-      return;
-    }
-
-    it->in_use = false;
-    return;
-  }
-
-  DLOG(ERROR) << "Attempting to return a frontbuffer that was not saved.";
-}
-
-void GLES2DecoderImpl::CreateBackTexture() {
-  for (auto it = saved_back_textures_.begin(); it != saved_back_textures_.end();
-       ++it) {
-    if (it->in_use)
-      continue;
-
-    if (it->back_texture->size() != offscreen_size_)
-      continue;
-    offscreen_saved_color_texture_ = std::move(it->back_texture);
-    offscreen_saved_color_texture_info_ = it->texture_ref;
-    saved_back_textures_.erase(it);
-    return;
-  }
-
-  ++create_back_texture_count_for_test_;
-  offscreen_saved_color_texture_.reset(
-      new BackTexture(memory_tracker(), &state_));
-  offscreen_saved_color_texture_->Create();
-  offscreen_saved_color_texture_->AllocateStorage(
-      offscreen_size_, offscreen_saved_color_format_, false);
-  offscreen_saved_frame_buffer_->AttachRenderTexture(
-      offscreen_saved_color_texture_.get());
-}
-
-void GLES2DecoderImpl::ReleaseNotInUseBackTextures() {
-  for (auto& saved_back_texture : saved_back_textures_) {
-    if (!saved_back_texture.in_use)
-      saved_back_texture.back_texture->Invalidate();
-  }
-
-  auto to_remove =
-      std::remove_if(saved_back_textures_.begin(), saved_back_textures_.end(),
-                     [](const SavedBackTexture& saved_back_texture) {
-                       return !saved_back_texture.in_use;
-                     });
-  saved_back_textures_.erase(to_remove, saved_back_textures_.end());
-}
-
-void GLES2DecoderImpl::ReleaseAllBackTextures() {
-  for (auto& saved_back_texture : saved_back_textures_) {
-    // The texture will be destroyed by texture_ref's destructor.
-    DCHECK(saved_back_texture.texture_ref);
-    saved_back_texture.back_texture->Invalidate();
-  }
-  saved_back_textures_.clear();
-}
-
-size_t GLES2DecoderImpl::GetSavedBackTextureCountForTest() {
-  return saved_back_textures_.size();
-}
-
-size_t GLES2DecoderImpl::GetCreatedBackTextureCountForTest() {
-  return create_back_texture_count_for_test_;
 }
 
 bool GLES2DecoderImpl::ResizeOffscreenFrameBuffer(const gfx::Size& size) {
   bool is_offscreen = !!offscreen_target_frame_buffer_.get();
   if (!is_offscreen) {
     LOG(ERROR) << "GLES2DecoderImpl::ResizeOffscreenFrameBuffer called "
                << " with an onscreen framebuffer.";
     return false;
   }
 
@@ skipping 8532 matching lines @@
         "width", offscreen_size_.width(), "height", offscreen_size_.height());
     if (offscreen_size_ != offscreen_saved_color_texture_->size()) {
       // Workaround for NVIDIA driver bug on OS X; crbug.com/89557,
       // crbug.com/94163. TODO(kbr): figure out reproduction so Apple will
       // fix this.
       if (workarounds().needs_offscreen_buffer_workaround) {
         offscreen_saved_frame_buffer_->Create();
         glFinish();
       }
 
-      // The size has changed, so none of the cached BackTextures are useful
-      // anymore.
-      ReleaseNotInUseBackTextures();
-
       // Allocate the offscreen saved color texture.
       DCHECK(offscreen_saved_color_format_);
       offscreen_saved_color_texture_->AllocateStorage(
           offscreen_size_, offscreen_saved_color_format_, false);
 
       offscreen_saved_frame_buffer_->AttachRenderTexture(
           offscreen_saved_color_texture_.get());
       if (offscreen_size_.width() != 0 && offscreen_size_.height() != 0) {
         if (offscreen_saved_frame_buffer_->CheckStatus() !=
             GL_FRAMEBUFFER_COMPLETE) {
@@ skipping 3628 matching lines @@
 }
 
 // Include the auto-generated part of this file. We split this because it means
 // we can easily edit the non-auto generated parts right here in this file
 // instead of having to edit some template or the code generator.
 #include "base/macros.h"
 #include "gpu/command_buffer/service/gles2_cmd_decoder_autogen.h"
 
 }  // namespace gles2
 }  // namespace gpu