mirror of
https://github.com/mozilla/gecko-dev.git
synced 2024-12-08 14:03:49 +00:00
134 lines
3.6 KiB
C++
134 lines
3.6 KiB
C++
/* -*- Mode: C++; tab-width: 2; indent-tabs-mode: nil; c-basic-offset: 2 -*- */
|
|
/* This Source Code Form is subject to the terms of the Mozilla Public
|
|
* License, v. 2.0. If a copy of the MPL was not distributed with this
|
|
* file, You can obtain one at http://mozilla.org/MPL/2.0/. */
|
|
|
|
/**
|
|
* An interface for tasks which can execute on the ImageLib DecodePool, and
|
|
* various implementations.
|
|
*/
|
|
|
|
#ifndef mozilla_image_IDecodingTask_h
|
|
#define mozilla_image_IDecodingTask_h
|
|
|
|
#include "imgFrame.h"
|
|
#include "mozilla/NotNull.h"
|
|
#include "mozilla/RefPtr.h"
|
|
#include "nsIEventTarget.h"
|
|
#include "SourceBuffer.h"
|
|
|
|
namespace mozilla {
|
|
namespace image {
|
|
|
|
class Decoder;
|
|
class RasterImage;
|
|
|
|
/// A priority hint that DecodePool can use when scheduling an IDecodingTask.
|
|
enum class TaskPriority : uint8_t
|
|
{
|
|
eLow,
|
|
eHigh
|
|
};
|
|
|
|
/**
|
|
* An interface for tasks which can execute on the ImageLib DecodePool.
|
|
*/
|
|
class IDecodingTask : public IResumable
|
|
{
|
|
public:
|
|
/// Run the task.
|
|
virtual void Run() = 0;
|
|
|
|
/// @return true if, given the option, this task prefers to run synchronously.
|
|
virtual bool ShouldPreferSyncRun() const = 0;
|
|
|
|
/// @return a priority hint that DecodePool can use when scheduling this task.
|
|
virtual TaskPriority Priority() const = 0;
|
|
|
|
/// A default implementation of IResumable which resubmits the task to the
|
|
/// DecodePool. Subclasses can override this if they need different behavior.
|
|
void Resume() override;
|
|
|
|
protected:
|
|
virtual ~IDecodingTask() { }
|
|
|
|
/// Notify @aImage of @aDecoder's progress.
|
|
void NotifyProgress(NotNull<RasterImage*> aImage,
|
|
NotNull<Decoder*> aDecoder);
|
|
|
|
/// Notify @aImage that @aDecoder has finished.
|
|
void NotifyDecodeComplete(NotNull<RasterImage*> aImage,
|
|
NotNull<Decoder*> aDecoder);
|
|
|
|
private:
|
|
void EnsureHasEventTarget(NotNull<RasterImage*> aImage);
|
|
|
|
bool IsOnEventTarget() const;
|
|
|
|
nsCOMPtr<nsIEventTarget> mEventTarget;
|
|
};
|
|
|
|
|
|
/**
|
|
* An IDecodingTask implementation for metadata decodes of images.
|
|
*/
|
|
class MetadataDecodingTask final : public IDecodingTask
|
|
{
|
|
public:
|
|
NS_INLINE_DECL_THREADSAFE_REFCOUNTING(MetadataDecodingTask, override)
|
|
|
|
explicit MetadataDecodingTask(NotNull<Decoder*> aDecoder);
|
|
|
|
void Run() override;
|
|
|
|
// Metadata decodes are very fast (since they only need to examine an image's
|
|
// header) so there's no reason to refuse to run them synchronously if the
|
|
// caller will allow us to.
|
|
bool ShouldPreferSyncRun() const override { return true; }
|
|
|
|
// Metadata decodes run at the highest priority because they block layout and
|
|
// page load.
|
|
TaskPriority Priority() const override { return TaskPriority::eHigh; }
|
|
|
|
private:
|
|
virtual ~MetadataDecodingTask() { }
|
|
|
|
/// Mutex protecting access to mDecoder.
|
|
Mutex mMutex;
|
|
|
|
NotNull<RefPtr<Decoder>> mDecoder;
|
|
};
|
|
|
|
|
|
/**
|
|
* An IDecodingTask implementation for anonymous decoders - that is, decoders
|
|
* with no associated Image object.
|
|
*/
|
|
class AnonymousDecodingTask final : public IDecodingTask
|
|
{
|
|
public:
|
|
NS_INLINE_DECL_THREADSAFE_REFCOUNTING(AnonymousDecodingTask, override)
|
|
|
|
explicit AnonymousDecodingTask(NotNull<Decoder*> aDecoder);
|
|
|
|
void Run() override;
|
|
|
|
bool ShouldPreferSyncRun() const override { return true; }
|
|
TaskPriority Priority() const override { return TaskPriority::eLow; }
|
|
|
|
// Anonymous decoders normally get all their data at once. We have tests where
|
|
// they don't; in these situations, the test re-runs them manually. So no
|
|
// matter what, we don't want to resume by posting a task to the DecodePool.
|
|
void Resume() override { }
|
|
|
|
private:
|
|
virtual ~AnonymousDecodingTask() { }
|
|
|
|
NotNull<RefPtr<Decoder>> mDecoder;
|
|
};
|
|
|
|
} // namespace image
|
|
} // namespace mozilla
|
|
|
|
#endif // mozilla_image_IDecodingTask_h
|