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// Copyright 2012 The Chromium Authors
// Use of this source code is governed by a BSD-style license that can be
// found in the LICENSE file.
#ifndef COMPONENTS_VIZ_SERVICE_DISPLAY_SOFTWARE_OUTPUT_DEVICE_H_
#define COMPONENTS_VIZ_SERVICE_DISPLAY_SOFTWARE_OUTPUT_DEVICE_H_
#include <memory>
#include "base/functional/callback.h"
#include "base/memory/raw_ptr.h"
#include "base/task/sequenced_task_runner.h"
#include "components/viz/service/display/software_output_device_client.h"
#include "components/viz/service/viz_service_export.h"
#include "third_party/skia/include/core/SkSurface.h"
#include "ui/gfx/frame_data.h"
#include "ui/gfx/geometry/rect.h"
#include "ui/gfx/geometry/size.h"
#include "ui/gfx/geometry/vector2d.h"
class SkCanvas;
namespace gfx {
class VSyncProvider;
} // namespace gfx
namespace viz {
class SoftwareOutputDeviceClient;
// This is a "tear-off" class providing software drawing support to
// OutputSurface, such as to a platform-provided window framebuffer.
class VIZ_SERVICE_EXPORT SoftwareOutputDevice {
public:
// Uses TaskRunner returned from SequencedTaskRunner::GetCurrentDefault().
SoftwareOutputDevice();
explicit SoftwareOutputDevice(
scoped_refptr<base::SequencedTaskRunner> task_runner);
SoftwareOutputDevice(const SoftwareOutputDevice&) = delete;
SoftwareOutputDevice& operator=(const SoftwareOutputDevice&) = delete;
virtual ~SoftwareOutputDevice();
// This may be called only once, and requires a non-nullptr argument.
void BindToClient(SoftwareOutputDeviceClient* client);
// Discards any pre-existing backing buffers and allocates memory for a
// software device of |size|. This must be called before the
// |SoftwareOutputDevice| can be used in other ways.
virtual void Resize(const gfx::Size& pixel_size, float scale_factor);
// Called on BeginDrawingFrame. The compositor will draw into the returned
// SkCanvas. The |SoftwareOutputDevice| implementation needs to provide a
// valid SkCanvas of at least size |damage_rect|. This class retains ownership
// of the SkCanvas.
virtual SkCanvas* BeginPaint(const gfx::Rect& damage_rect);
// Called on FinishDrawingFrame. The compositor will no longer mutate the the
// SkCanvas instance returned by |BeginPaint| and should discard any reference
// that it holds to it.
virtual void EndPaint();
// Discard the backing buffer in the surface provided by this instance.
virtual void DiscardBackbuffer() {}
// Ensures that there is a backing buffer available on this instance.
virtual void EnsureBackbuffer() {}
// VSyncProvider used to update the timer used to schedule draws with the
// hardware vsync. Return null if a provider doesn't exist.
virtual gfx::VSyncProvider* GetVSyncProvider();
using SwapBuffersCallback = base::OnceCallback<void(const gfx::Size&)>;
// Called from OutputSurface::SwapBuffers(). The default implementation will
// immediately run |swap_ack_callback| via PostTask. If swap isn't synchronous
// this can be overriden so that |swap_ack_callback| is run after swap
// completes.
virtual void OnSwapBuffers(SwapBuffersCallback swap_ack_callback,
gfx::FrameData data);
virtual int MaxFramesPending() const;
// Returns true if we are allowed to adopt a size different from the
// platform's proposed surface size.
virtual bool SupportsOverridePlatformSize() const;
// Copy and return the contents of |surface_|.
SkBitmap ReadbackForTesting();
protected:
scoped_refptr<base::SequencedTaskRunner> task_runner_;
raw_ptr<SoftwareOutputDeviceClient> client_ = nullptr;
gfx::Size viewport_pixel_size_;
gfx::Rect damage_rect_;
sk_sp<SkSurface> surface_;
std::unique_ptr<gfx::VSyncProvider> vsync_provider_;
};
} // namespace viz
#endif // COMPONENTS_VIZ_SERVICE_DISPLAY_SOFTWARE_OUTPUT_DEVICE_H_
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