Revert "Delete CC."

cc/output/software_output_device.h

+// Copyright 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 CC_OUTPUT_SOFTWARE_OUTPUT_DEVICE_H_
+#define CC_OUTPUT_SOFTWARE_OUTPUT_DEVICE_H_
+
+#include "base/basictypes.h"
+#include "base/memory/scoped_ptr.h"
+#include "skia/ext/refptr.h"
+#include "third_party/skia/include/core/SkSurface.h"
+#include "ui/gfx/geometry/rect.h"
+#include "ui/gfx/geometry/size.h"
+#include "ui/gfx/geometry/vector2d.h"
+
+class SkBitmap;
+class SkCanvas;
+
+namespace gfx {
+class VSyncProvider;
+}
+
+namespace cc {
+
+class SoftwareFrameData;
+
+// This is a "tear-off" class providing software drawing support to
+// OutputSurface, such as to a platform-provided window framebuffer.
+class SoftwareOutputDevice {
+ public:
+  SoftwareOutputDevice();
+  virtual ~SoftwareOutputDevice();
+
+  // 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(SoftwareFrameData* frame_data);
+
+  // Copies pixels inside |rect| from the current software framebuffer to
+  // |pixels|. Fails if there is no current softwareframebuffer.
+  virtual void CopyToPixels(const gfx::Rect& rect, void* pixels);
+
+  // Blit the pixel content of the SoftwareOutputDevice by |delta| with the
+  // write clipped to |clip_rect|.
+  virtual void Scroll(const gfx::Vector2d& delta, const gfx::Rect& clip_rect);
+
+  // 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() {}
+
+  // TODO(skaslev) Remove this after UberCompositor lands.
+  // Called in response to receiving a SwapBuffersAck. At this point, software
+  // frame identified by id can be reused or discarded as it is no longer being
+  // displayed.
+  virtual void ReclaimSoftwareFrame(unsigned id);
+
+  // 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();
+
+ protected:
+  gfx::Size viewport_pixel_size_;
+  float scale_factor_;
+  gfx::Rect damage_rect_;
+  skia::RefPtr<SkSurface> surface_;
+  scoped_ptr<gfx::VSyncProvider> vsync_provider_;
+
+ private:
+  DISALLOW_COPY_AND_ASSIGN(SoftwareOutputDevice);
+};
+
+}  // namespace cc
+
+#endif  // CC_OUTPUT_SOFTWARE_OUTPUT_DEVICE_H_