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authorDaniel Baumann <daniel.baumann@progress-linux.org>2024-04-07 17:32:43 +0000
committerDaniel Baumann <daniel.baumann@progress-linux.org>2024-04-07 17:32:43 +0000
commit6bf0a5cb5034a7e684dcc3500e841785237ce2dd (patch)
treea68f146d7fa01f0134297619fbe7e33db084e0aa /dom/media/mediacontrol/FetchImageHelper.h
parentInitial commit. (diff)
downloadthunderbird-6bf0a5cb5034a7e684dcc3500e841785237ce2dd.tar.xz
thunderbird-6bf0a5cb5034a7e684dcc3500e841785237ce2dd.zip
Adding upstream version 1:115.7.0.upstream/1%115.7.0upstream
Signed-off-by: Daniel Baumann <daniel.baumann@progress-linux.org>
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+/* 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/. */
+
+#ifndef DOM_MEDIA_MEDIACONTROL_FETCHIMAGEHELPER_H_
+#define DOM_MEDIA_MEDIACONTROL_FETCHIMAGEHELPER_H_
+
+#include "imgIContainer.h"
+#include "imgITools.h"
+#include "mozilla/dom/MediaSessionBinding.h"
+#include "mozilla/MozPromise.h"
+
+namespace mozilla::dom {
+/**
+ * FetchImageHelper is used to fetch image data from MediaImage, and the fetched
+ * image data would be used to show on the virtual control inferface. The URL of
+ * MediaImage is defined by websites by using MediaSession API [1].
+ *
+ * By using `FetchImage()`, it would return a promise that would resolve with a
+ * `imgIContainer`, then we can get the image data from the container.
+ *
+ * [1] https://w3c.github.io/mediasession/#dictdef-mediaimage
+ */
+using ImagePromise = MozPromise<nsCOMPtr<imgIContainer>, bool,
+ /* IsExclusive = */ true>;
+class FetchImageHelper final {
+ public:
+ explicit FetchImageHelper(const MediaImage& aImage);
+ ~FetchImageHelper();
+
+ // Return a promise which would be resolved with the decoded image surface
+ // when we finish fetching and decoding image data, and it would be rejected
+ // when we fail to fecth the image.
+ RefPtr<ImagePromise> FetchImage();
+
+ // Stop fetching and decoding image and reject the image promise. If we have
+ // not started yet fetching image, then nothing would happen.
+ void AbortFetchingImage();
+
+ // Return true if we're fecthing image.
+ bool IsFetchingImage() const;
+
+ private:
+ /**
+ * ImageFetchListener is used to listen the notification of finishing fetching
+ * image data (via `OnImageReady()`) and finishing decoding image data (via
+ * `Notify()`).
+ */
+ class ImageFetchListener final : public imgIContainerCallback {
+ public:
+ NS_DECL_ISUPPORTS
+ ImageFetchListener() = default;
+
+ // Start an async channel to load the image, and return error if the channel
+ // opens failed. It would use `aHelper::HandleFetchSuccess/Fail()` to notify
+ // the result asynchronously.
+ nsresult FetchDecodedImageFromURI(nsIURI* aURI, FetchImageHelper* aHelper);
+ void Clear();
+ bool IsFetchingImage() const;
+
+ // Method of imgIContainerCallback
+ NS_IMETHOD OnImageReady(imgIContainer* aImage, nsresult aStatus) override;
+
+ private:
+ ~ImageFetchListener();
+
+ FetchImageHelper* MOZ_NON_OWNING_REF mHelper = nullptr;
+ nsCOMPtr<nsIChannel> mChannel;
+ };
+
+ void ClearListenerIfNeeded();
+ void HandleFetchSuccess(imgIContainer* aImage);
+ void HandleFetchFail();
+
+ nsString mSrc;
+ MozPromiseHolder<ImagePromise> mPromise;
+ RefPtr<ImageFetchListener> mListener;
+};
+
+} // namespace mozilla::dom
+
+#endif // DOM_MEDIA_MEDIACONTROL_FETCHIMAGEHELPER_H_