cc/quads/render_pass.h

// Copyright 2011 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_RENDER_PASS_H_
#define CC_QUADS_RENDER_PASS_H_

#include <stddef.h>

#include <unordered_map>
#include <utility>
#include <vector>

#include "base/callback.h"
#include "base/hash.h"
#include "base/macros.h"
#include "cc/base/cc_export.h"
#include "cc/base/list_container.h"
#include "cc/quads/draw_quad.h"
#include "cc/quads/largest_draw_quad.h"
#include "cc/quads/render_pass_id.h"
#include "cc/surfaces/surface_id.h"
#include "ui/gfx/geometry/rect.h"
#include "ui/gfx/geometry/rect_f.h"
#include "ui/gfx/transform.h"

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

namespace cc {

class DrawQuad;
class CopyOutputRequest;
class RenderPassDrawQuad;
class SharedQuadState;

// A list of DrawQuad objects, sorted internally in front-to-back order.
class CC_EXPORT QuadList : public ListContainer<DrawQuad> {
 public:
  QuadList();
  explicit QuadList(size_t default_size_to_reserve);

  typedef QuadList::ReverseIterator BackToFrontIterator;
  typedef QuadList::ConstReverseIterator ConstBackToFrontIterator;

  inline BackToFrontIterator BackToFrontBegin() { return rbegin(); }
  inline BackToFrontIterator BackToFrontEnd() { return rend(); }
  inline ConstBackToFrontIterator BackToFrontBegin() const { return rbegin(); }
  inline ConstBackToFrontIterator BackToFrontEnd() const { return rend(); }
};

typedef ListContainer<SharedQuadState> SharedQuadStateList;

class CC_EXPORT RenderPass {
 public:
  ~RenderPass();

  static std::unique_ptr<RenderPass> Create();
  static std::unique_ptr<RenderPass> Create(size_t num_layers);
  static std::unique_ptr<RenderPass> Create(size_t shared_quad_state_list_size,
                                            size_t quad_list_size);

  // A shallow copy of the render pass, which does not include its quads or copy
  // requests.
  std::unique_ptr<RenderPass> Copy(RenderPassId new_id) const;

  // A deep copy of the render passes in the list including the quads.
  static void CopyAll(const std::vector<std::unique_ptr<RenderPass>>& in,
                      std::vector<std::unique_ptr<RenderPass>>* out);

  void SetNew(RenderPassId id,
              const gfx::Rect& output_rect,
              const gfx::Rect& damage_rect,
              const gfx::Transform& transform_to_root_target);

  void SetAll(RenderPassId id,
              const gfx::Rect& output_rect,
              const gfx::Rect& damage_rect,
              const gfx::Transform& transform_to_root_target,
              bool has_transparent_background);

  void AsValueInto(base::trace_event::TracedValue* dict) const;

  SharedQuadState* CreateAndAppendSharedQuadState();

  template <typename DrawQuadType>
  DrawQuadType* CreateAndAppendDrawQuad() {
    return quad_list.AllocateAndConstruct<DrawQuadType>();
  }

  RenderPassDrawQuad* CopyFromAndAppendRenderPassDrawQuad(
      const RenderPassDrawQuad* quad,
      const SharedQuadState* shared_quad_state,
      RenderPassId render_pass_id);
  DrawQuad* CopyFromAndAppendDrawQuad(const DrawQuad* quad,
                                      const SharedQuadState* shared_quad_state);

  // Uniquely identifies the render pass in the compositor's current frame.
  RenderPassId id;

  // These are in the space of the render pass' physical pixels.
  gfx::Rect output_rect;
  gfx::Rect damage_rect;

  // Transforms from the origin of the |output_rect| to the origin of the root
  // render pass' |output_rect|.
  gfx::Transform transform_to_root_target;

  // If false, the pixels in the render pass' texture are all opaque.
  bool has_transparent_background;

  // If non-empty, the renderer should produce a copy of the render pass'
  // contents as a bitmap, and give a copy of the bitmap to each callback in
  // this list. This property should not be serialized between compositors, as
  // it only makes sense in the root compositor.
  std::vector<std::unique_ptr<CopyOutputRequest>> copy_requests;

  QuadList quad_list;
  SharedQuadStateList shared_quad_state_list;

 protected:
  explicit RenderPass(size_t num_layers);
  RenderPass();
  RenderPass(size_t shared_quad_state_list_size, size_t quad_list_size);

 private:
  template <typename DrawQuadType>
  DrawQuadType* CopyFromAndAppendTypedDrawQuad(const DrawQuad* quad) {
    return quad_list.AllocateAndCopyFrom(DrawQuadType::MaterialCast(quad));
  }

  DISALLOW_COPY_AND_ASSIGN(RenderPass);
};

using RenderPassList = std::vector<std::unique_ptr<RenderPass>>;
using RenderPassIdHashMap =
    std::unordered_map<RenderPassId, RenderPass*, RenderPassIdHash>;

}  // namespace cc

#endif  // CC_QUADS_RENDER_PASS_H_