root/gpu/command_buffer/service/stream_texture_manager_in_process_android.cc

DEFINITIONS

1. DidUseTexImage
2. WillModifyTexImage
3. DidModifyTexImage
4. release_callback_
5. Destroy
6. WillUseTexImage
7. BindTexImage
8. ReleaseTexImage
9. GetSize
10. weak_factory_
11. CreateStreamTexture
12. OnReleaseStreamTexture
13. GetSurfaceTexture

// 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 "gpu/command_buffer/service/stream_texture_manager_in_process_android.h"

#include "base/bind.h"
#include "base/callback.h"
#include "gpu/command_buffer/service/texture_manager.h"
#include "ui/gfx/size.h"
#include "ui/gl/android/surface_texture.h"
#include "ui/gl/gl_bindings.h"
#include "ui/gl/gl_image.h"

namespace gpu {

namespace {

// Simply wraps a SurfaceTexture reference as a GLImage.
class GLImageImpl : public gfx::GLImage {
 public:
  GLImageImpl(const scoped_refptr<gfx::SurfaceTexture>& surface_texture,
              const base::Closure& release_callback);

  // implement gfx::GLImage
  virtual void Destroy() OVERRIDE;
  virtual gfx::Size GetSize() OVERRIDE;
  virtual bool BindTexImage(unsigned target) OVERRIDE;
  virtual void ReleaseTexImage(unsigned target) OVERRIDE;
  virtual void WillUseTexImage() OVERRIDE;
  virtual void DidUseTexImage() OVERRIDE {}
  virtual void WillModifyTexImage() OVERRIDE {}
  virtual void DidModifyTexImage() OVERRIDE {}

 private:
  virtual ~GLImageImpl();

  scoped_refptr<gfx::SurfaceTexture> surface_texture_;
  base::Closure release_callback_;

  DISALLOW_COPY_AND_ASSIGN(GLImageImpl);
};

GLImageImpl::GLImageImpl(
    const scoped_refptr<gfx::SurfaceTexture>& surface_texture,
    const base::Closure& release_callback)
    : surface_texture_(surface_texture), release_callback_(release_callback) {}

GLImageImpl::~GLImageImpl() {
  release_callback_.Run();
}

void GLImageImpl::Destroy() {
  NOTREACHED();
}

void GLImageImpl::WillUseTexImage() {
  surface_texture_->UpdateTexImage();
}

bool GLImageImpl::BindTexImage(unsigned target) {
  NOTREACHED();
  return false;
}

void GLImageImpl::ReleaseTexImage(unsigned target) {
  NOTREACHED();
}

gfx::Size GLImageImpl::GetSize() {
  return gfx::Size();
}

}  // anonymous namespace

StreamTextureManagerInProcess::StreamTextureManagerInProcess()
    : next_id_(1), weak_factory_(this) {}

StreamTextureManagerInProcess::~StreamTextureManagerInProcess() {
  if (!textures_.empty()) {
    LOG(WARNING) << "Undestroyed surface textures while tearing down "
                    "StreamTextureManager.";
  }
}

GLuint StreamTextureManagerInProcess::CreateStreamTexture(
    uint32 client_texture_id,
    gles2::TextureManager* texture_manager) {
  CalledOnValidThread();

  gles2::TextureRef* texture = texture_manager->GetTexture(client_texture_id);

  if (!texture || (texture->texture()->target() &&
                   texture->texture()->target() != GL_TEXTURE_EXTERNAL_OES)) {
    return 0;
  }

  scoped_refptr<gfx::SurfaceTexture> surface_texture(
      gfx::SurfaceTexture::Create(texture->service_id()));

  uint32 stream_id = next_id_++;
  base::Closure release_callback =
      base::Bind(&StreamTextureManagerInProcess::OnReleaseStreamTexture,
                 weak_factory_.GetWeakPtr(), stream_id);
  scoped_refptr<gfx::GLImage> gl_image(new GLImageImpl(surface_texture,
                                       release_callback));

  gfx::Size size = gl_image->GetSize();
  texture_manager->SetTarget(texture, GL_TEXTURE_EXTERNAL_OES);
  texture_manager->SetLevelInfo(texture,
                                GL_TEXTURE_EXTERNAL_OES,
                                0,
                                GL_RGBA,
                                size.width(),
                                size.height(),
                                1,
                                0,
                                GL_RGBA,
                                GL_UNSIGNED_BYTE,
                                true);
  texture_manager->SetLevelImage(texture, GL_TEXTURE_EXTERNAL_OES, 0, gl_image);

  {
    base::AutoLock lock(map_lock_);
    textures_[stream_id] = surface_texture;
  }

  if (next_id_ == 0)
    next_id_++;

  return stream_id;
}

void StreamTextureManagerInProcess::OnReleaseStreamTexture(uint32 stream_id) {
  CalledOnValidThread();
  base::AutoLock lock(map_lock_);
  textures_.erase(stream_id);
}

// This can get called from any thread.
scoped_refptr<gfx::SurfaceTexture>
StreamTextureManagerInProcess::GetSurfaceTexture(uint32 stream_id) {
  base::AutoLock lock(map_lock_);
  TextureMap::const_iterator it = textures_.find(stream_id);
  if (it != textures_.end())
    return it->second;

  return NULL;
}

}  // namespace gpu