cc/quads/shared_quad_state.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_QUADS_SHARED_QUAD_STATE_H_
#define CC_QUADS_SHARED_QUAD_STATE_H_

#include "base/memory/scoped_ptr.h"
#include "third_party/skia/include/core/SkXfermode.h"
#include "ui/gfx/geometry/rect.h"
#include "ui/gfx/transform.h"

namespace base {
namespace trace_event {
class TracedValue;
}
class Value;
}

namespace cc {

// SharedQuadState holds a set of properties that are common across multiple
// DrawQuads. It's purely an optimization - the properties behave in exactly the
// same way as if they were replicated on each DrawQuad. A given SharedQuadState
// can only be shared by DrawQuads that are adjacent in their RenderPass'
// QuadList.
class SharedQuadState {
 public:
  SharedQuadState();
  ~SharedQuadState();

  void CopyFrom(const SharedQuadState* other);

  void SetAll(const gfx::Transform& content_to_target_transform,
              const gfx::Size& content_bounds,
              const gfx::Rect& visible_content_rect,
              const gfx::Rect& clip_rect,
              bool is_clipped,
              float opacity,
              SkXfermode::Mode blend_mode,
              int sorting_context_id);
  void AsValueInto(base::trace_event::TracedValue* dict) const;

  // Transforms from quad's original content space to its target content space.
  gfx::Transform content_to_target_transform;
  // This size lives in the content space for the quad's originating layer.
  gfx::Size content_bounds;
  // This rect lives in the content space for the quad's originating layer.
  gfx::Rect visible_content_rect;
  // This rect lives in the target content space.
  gfx::Rect clip_rect;
  bool is_clipped;
  float opacity;
  SkXfermode::Mode blend_mode;
  int sorting_context_id;
};

}  // namespace cc

#endif  // CC_QUADS_SHARED_QUAD_STATE_H_