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// Copyright 2014 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_OVERLAY_PROCESSOR_H_
#define CC_OUTPUT_OVERLAY_PROCESSOR_H_
#include <memory>
#include "base/macros.h"
#include "cc/base/cc_export.h"
#include "cc/output/ca_layer_overlay.h"
#include "cc/output/overlay_candidate.h"
#include "cc/quads/render_pass.h"
namespace cc {
class OutputSurface;
class ResourceProvider;
class CC_EXPORT OverlayProcessor {
public:
class CC_EXPORT Strategy {
public:
virtual ~Strategy() {}
// Returns false if the strategy cannot be made to work with the
// current set of render passes. Returns true if the strategy was successful
// and adds any additional passes necessary to represent overlays to
// |render_passes|.
virtual bool Attempt(ResourceProvider* resource_provider,
RenderPass* render_pass,
OverlayCandidateList* candidates,
std::vector<gfx::Rect>* content_bounds) = 0;
};
using StrategyList = std::vector<std::unique_ptr<Strategy>>;
explicit OverlayProcessor(OutputSurface* surface);
virtual ~OverlayProcessor();
// Virtual to allow testing different strategies.
virtual void Initialize();
gfx::Rect GetAndResetOverlayDamage();
// Attempt to replace quads from the specified root render pass with overlays
// or CALayers. This must be called every frame.
void ProcessForOverlays(
ResourceProvider* resource_provider,
RenderPass* root_render_pass,
const RenderPassFilterList& render_pass_filters,
const RenderPassFilterList& render_pass_background_filters,
OverlayCandidateList* overlay_candidates,
CALayerOverlayList* ca_layer_overlays,
gfx::Rect* damage_rect,
std::vector<gfx::Rect>* content_bounds);
protected:
StrategyList strategies_;
OutputSurface* surface_;
gfx::Rect overlay_damage_rect_;
gfx::Rect previous_frame_underlay_rect_;
private:
bool ProcessForCALayers(
ResourceProvider* resource_provider,
RenderPass* render_pass,
const RenderPassFilterList& render_pass_filters,
const RenderPassFilterList& render_pass_background_filters,
OverlayCandidateList* overlay_candidates,
CALayerOverlayList* ca_layer_overlays,
gfx::Rect* damage_rect);
// Update |damage_rect| by removing damage casued by |candidates|.
void UpdateDamageRect(OverlayCandidateList* candidates,
gfx::Rect* damage_rect);
DISALLOW_COPY_AND_ASSIGN(OverlayProcessor);
};
} // namespace cc
#endif // CC_OUTPUT_OVERLAY_PROCESSOR_H_
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