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7795dbcc68
Depends on D145752 Differential Revision: https://phabricator.services.mozilla.com/D145753
82 lines
2.8 KiB
C++
82 lines
2.8 KiB
C++
/* 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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#ifndef DOM_MEDIA_MEDIACONTROL_FETCHIMAGEHELPER_H_
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#define DOM_MEDIA_MEDIACONTROL_FETCHIMAGEHELPER_H_
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#include "imgIContainer.h"
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#include "imgITools.h"
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#include "mozilla/dom/MediaSessionBinding.h"
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#include "mozilla/MozPromise.h"
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namespace mozilla::dom {
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/**
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* FetchImageHelper is used to fetch image data from MediaImage, and the fetched
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* image data would be used to show on the virtual control inferface. The URL of
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* MediaImage is defined by websites by using MediaSession API [1].
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*
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* By using `FetchImage()`, it would return a promise that would resolve with a
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* `imgIContainer`, then we can get the image data from the container.
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*
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* [1] https://w3c.github.io/mediasession/#dictdef-mediaimage
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*/
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using ImagePromise = MozPromise<nsCOMPtr<imgIContainer>, bool,
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/* IsExclusive = */ true>;
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class FetchImageHelper final {
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public:
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explicit FetchImageHelper(const MediaImage& aImage);
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~FetchImageHelper();
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// Return a promise which would be resolved with the decoded image surface
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// when we finish fetching and decoding image data, and it would be rejected
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// when we fail to fecth the image.
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RefPtr<ImagePromise> FetchImage();
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// Stop fetching and decoding image and reject the image promise. If we have
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// not started yet fetching image, then nothing would happen.
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void AbortFetchingImage();
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// Return true if we're fecthing image.
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bool IsFetchingImage() const;
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private:
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/**
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* ImageFetchListener is used to listen the notification of finishing fetching
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* image data (via `OnImageReady()`) and finishing decoding image data (via
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* `Notify()`).
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*/
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class ImageFetchListener final : public imgIContainerCallback {
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public:
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NS_DECL_ISUPPORTS
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ImageFetchListener() = default;
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// Start an async channel to load the image, and return error if the channel
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// opens failed. It would use `aHelper::HandleFetchSuccess/Fail()` to notify
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// the result asynchronously.
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nsresult FetchDecodedImageFromURI(nsIURI* aURI, FetchImageHelper* aHelper);
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void Clear();
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bool IsFetchingImage() const;
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// Method of imgIContainerCallback
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NS_IMETHOD OnImageReady(imgIContainer* aImage, nsresult aStatus) override;
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private:
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~ImageFetchListener();
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FetchImageHelper* MOZ_NON_OWNING_REF mHelper = nullptr;
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nsCOMPtr<nsIChannel> mChannel;
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};
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void ClearListenerIfNeeded();
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void HandleFetchSuccess(imgIContainer* aImage);
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void HandleFetchFail();
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nsString mSrc;
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MozPromiseHolder<ImagePromise> mPromise;
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RefPtr<ImageFetchListener> mListener;
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};
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} // namespace mozilla::dom
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#endif // DOM_MEDIA_MEDIACONTROL_FETCHIMAGEHELPER_H_
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