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122 lines
3.4 KiB
C++
122 lines
3.4 KiB
C++
/* -*- Mode: C++; tab-width: 2; indent-tabs-mode: nil; c-basic-offset: 2 -*- */
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/* This Source Code Form is subject to the terms of the Mozilla Public
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* License, v. 2.0. If a copy of the MPL was not distributed with this
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* file, You can obtain one at http://mozilla.org/MPL/2.0/. */
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/**
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* An interface for tasks which can execute on the ImageLib DecodePool, and
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* various implementations.
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*/
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#ifndef mozilla_image_IDecodingTask_h
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#define mozilla_image_IDecodingTask_h
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#include "imgFrame.h"
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#include "mozilla/NotNull.h"
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#include "mozilla/RefPtr.h"
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#include "nsIEventTarget.h"
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#include "SourceBuffer.h"
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namespace mozilla {
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namespace image {
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class Decoder;
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class RasterImage;
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/// A priority hint that DecodePool can use when scheduling an IDecodingTask.
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enum class TaskPriority : uint8_t { eLow, eHigh };
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/**
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* An interface for tasks which can execute on the ImageLib DecodePool.
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*/
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class IDecodingTask : public IResumable {
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public:
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/// Run the task.
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virtual void Run() = 0;
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/// @return true if, given the option, this task prefers to run synchronously.
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virtual bool ShouldPreferSyncRun() const = 0;
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/// @return a priority hint that DecodePool can use when scheduling this task.
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virtual TaskPriority Priority() const = 0;
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/// A default implementation of IResumable which resubmits the task to the
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/// DecodePool. Subclasses can override this if they need different behavior.
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void Resume() override;
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protected:
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virtual ~IDecodingTask() {}
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/// Notify @aImage of @aDecoder's progress.
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void NotifyProgress(NotNull<RasterImage*> aImage, NotNull<Decoder*> aDecoder);
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/// Notify @aImage that @aDecoder has finished.
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void NotifyDecodeComplete(NotNull<RasterImage*> aImage,
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NotNull<Decoder*> aDecoder);
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private:
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void EnsureHasEventTarget(NotNull<RasterImage*> aImage);
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bool IsOnEventTarget() const;
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nsCOMPtr<nsIEventTarget> mEventTarget;
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};
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/**
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* An IDecodingTask implementation for metadata decodes of images.
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*/
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class MetadataDecodingTask final : public IDecodingTask {
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public:
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NS_INLINE_DECL_THREADSAFE_REFCOUNTING(MetadataDecodingTask, override)
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explicit MetadataDecodingTask(NotNull<Decoder*> aDecoder);
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void Run() override;
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// Metadata decodes are very fast (since they only need to examine an image's
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// header) so there's no reason to refuse to run them synchronously if the
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// caller will allow us to.
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bool ShouldPreferSyncRun() const override { return true; }
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// Metadata decodes run at the highest priority because they block layout and
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// page load.
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TaskPriority Priority() const override { return TaskPriority::eHigh; }
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private:
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virtual ~MetadataDecodingTask() {}
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/// Mutex protecting access to mDecoder.
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Mutex mMutex MOZ_UNANNOTATED;
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NotNull<RefPtr<Decoder>> mDecoder;
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};
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/**
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* An IDecodingTask implementation for anonymous decoders - that is, decoders
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* with no associated Image object.
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*/
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class AnonymousDecodingTask final : public IDecodingTask {
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public:
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NS_INLINE_DECL_THREADSAFE_REFCOUNTING(AnonymousDecodingTask, override)
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explicit AnonymousDecodingTask(NotNull<Decoder*> aDecoder, bool aResumable);
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void Run() override;
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bool ShouldPreferSyncRun() const override { return true; }
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TaskPriority Priority() const override { return TaskPriority::eLow; }
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void Resume() override;
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private:
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virtual ~AnonymousDecodingTask() {}
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NotNull<RefPtr<Decoder>> mDecoder;
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bool mResumable;
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};
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} // namespace image
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} // namespace mozilla
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#endif // mozilla_image_IDecodingTask_h
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