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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_RESOURCES_RASTERIZER_H_
#define CC_RESOURCES_RASTERIZER_H_
#include <vector>
#include "base/callback.h"
#include "cc/resources/resource_format.h"
#include "cc/resources/task_graph_runner.h"
class SkCanvas;
namespace cc {
class ImageDecodeTask;
class RasterTask;
class Resource;
class CC_EXPORT RasterizerTaskClient {
public:
virtual SkCanvas* AcquireCanvasForRaster(RasterTask* task) = 0;
virtual void ReleaseCanvasForRaster(RasterTask* task) = 0;
protected:
virtual ~RasterizerTaskClient() {}
};
class CC_EXPORT RasterizerTask : public Task {
public:
typedef std::vector<scoped_refptr<RasterizerTask> > Vector;
virtual void ScheduleOnOriginThread(RasterizerTaskClient* client) = 0;
virtual void CompleteOnOriginThread(RasterizerTaskClient* client) = 0;
virtual void RunReplyOnOriginThread() = 0;
// Type-checking downcast routines.
virtual ImageDecodeTask* AsImageDecodeTask();
virtual RasterTask* AsRasterTask();
void WillSchedule();
void DidSchedule();
bool HasBeenScheduled() const;
void WillComplete();
void DidComplete();
bool HasCompleted() const;
protected:
RasterizerTask();
virtual ~RasterizerTask();
bool did_schedule_;
bool did_complete_;
};
class CC_EXPORT ImageDecodeTask : public RasterizerTask {
public:
typedef std::vector<scoped_refptr<ImageDecodeTask> > Vector;
// Overridden from RasterizerTask:
virtual ImageDecodeTask* AsImageDecodeTask() OVERRIDE;
protected:
ImageDecodeTask();
virtual ~ImageDecodeTask();
};
class CC_EXPORT RasterTask : public RasterizerTask {
public:
typedef std::vector<scoped_refptr<RasterTask> > Vector;
// Overridden from RasterizerTask:
virtual RasterTask* AsRasterTask() OVERRIDE;
const Resource* resource() const { return resource_; }
const ImageDecodeTask::Vector& dependencies() const { return dependencies_; }
protected:
RasterTask(const Resource* resource, ImageDecodeTask::Vector* dependencies);
virtual ~RasterTask();
private:
const Resource* resource_;
ImageDecodeTask::Vector dependencies_;
};
class CC_EXPORT RasterizerClient {
public:
virtual bool ShouldForceTasksRequiredForActivationToComplete() const = 0;
virtual void DidFinishRunningTasks() = 0;
virtual void DidFinishRunningTasksRequiredForActivation() = 0;
protected:
virtual ~RasterizerClient() {}
};
struct CC_EXPORT RasterTaskQueue {
struct CC_EXPORT Item {
class TaskComparator {
public:
explicit TaskComparator(const RasterTask* task) : task_(task) {}
bool operator()(const Item& item) const { return item.task == task_; }
private:
const RasterTask* task_;
};
typedef std::vector<Item> Vector;
Item(RasterTask* task, bool required_for_activation);
~Item();
static bool IsRequiredForActivation(const Item& item) {
return item.required_for_activation;
}
RasterTask* task;
bool required_for_activation;
};
RasterTaskQueue();
~RasterTaskQueue();
void Swap(RasterTaskQueue* other);
void Reset();
Item::Vector items;
size_t required_for_activation_count;
};
// This interface can be used to schedule and run raster tasks. The client will
// be notified asynchronously when the set of tasks marked as "required for
// activation" have finished running and when all scheduled tasks have finished
// running. The client can call CheckForCompletedTasks() at any time to dispatch
// pending completion callbacks for all tasks that have finished running.
class CC_EXPORT Rasterizer {
public:
// Set the client instance to be notified when finished running tasks.
virtual void SetClient(RasterizerClient* client) = 0;
// Tells the worker pool to shutdown after canceling all previously scheduled
// tasks. Reply callbacks are still guaranteed to run when
// CheckForCompletedTasks() is called.
virtual void Shutdown() = 0;
// Schedule running of raster tasks in |queue| and all dependencies.
// Previously scheduled tasks that are not in |queue| will be canceled unless
// already running. Once scheduled, reply callbacks are guaranteed to run for
// all tasks even if they later get canceled by another call to
// ScheduleTasks().
virtual void ScheduleTasks(RasterTaskQueue* queue) = 0;
// Check for completed tasks and dispatch reply callbacks.
virtual void CheckForCompletedTasks() = 0;
protected:
virtual ~Rasterizer() {}
};
} // namespace cc
#endif // CC_RESOURCES_RASTERIZER_H_
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