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// 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.
#ifndef CONTENT_RENDERER_GPU_MAILBOX_OUTPUT_SURFACE_H_
#define CONTENT_RENDERER_GPU_MAILBOX_OUTPUT_SURFACE_H_
#include <queue>
#include "cc/resources/resource_format.h"
#include "cc/resources/transferable_resource.h"
#include "content/renderer/gpu/compositor_output_surface.h"
#include "ui/gfx/size.h"
namespace cc {
class CompositorFrameAck;
}
namespace content {
// Implementation of CompositorOutputSurface that renders to textures which
// are sent to the browser through the mailbox extension.
// This class can be created only on the main thread, but then becomes pinned
// to a fixed thread when bindToClient is called.
class MailboxOutputSurface : public CompositorOutputSurface {
public:
MailboxOutputSurface(
int32 routing_id,
uint32 output_surface_id,
const scoped_refptr<ContextProviderCommandBuffer>& context_provider,
scoped_ptr<cc::SoftwareOutputDevice> software_device,
cc::ResourceFormat format);
virtual ~MailboxOutputSurface();
// cc::OutputSurface implementation.
virtual void EnsureBackbuffer() OVERRIDE;
virtual void DiscardBackbuffer() OVERRIDE;
virtual void Reshape(gfx::Size size, float scale_factor) OVERRIDE;
virtual void BindFramebuffer() OVERRIDE;
virtual void SwapBuffers(cc::CompositorFrame* frame) OVERRIDE;
private:
// CompositorOutputSurface overrides.
virtual void OnSwapAck(uint32 output_surface_id,
const cc::CompositorFrameAck& ack) OVERRIDE;
size_t GetNumAcksPending();
struct TransferableFrame {
TransferableFrame() : texture_id(0), sync_point(0) {}
TransferableFrame(uint32 texture_id,
const gpu::Mailbox& mailbox,
const gfx::Size size)
: texture_id(texture_id), mailbox(mailbox), size(size), sync_point(0) {}
uint32 texture_id;
gpu::Mailbox mailbox;
gfx::Size size;
uint32 sync_point;
};
TransferableFrame current_backing_;
std::deque<TransferableFrame> pending_textures_;
std::queue<TransferableFrame> returned_textures_;
uint32 fbo_;
bool is_backbuffer_discarded_;
cc::ResourceFormat format_;
};
} // namespace content
#endif // CONTENT_RENDERER_GPU_MAILBOX_OUTPUT_SURFACE_H_
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