From 6bf0a5cb5034a7e684dcc3500e841785237ce2dd Mon Sep 17 00:00:00 2001
From: Daniel Baumann <daniel.baumann@progress-linux.org>
Date: Sun, 7 Apr 2024 19:32:43 +0200
Subject: Adding upstream version 1:115.7.0.

Signed-off-by: Daniel Baumann <daniel.baumann@progress-linux.org>
---
 dom/media/mediacontrol/FetchImageHelper.h | 82 +++++++++++++++++++++++++++++++
 1 file changed, 82 insertions(+)
 create mode 100644 dom/media/mediacontrol/FetchImageHelper.h

(limited to 'dom/media/mediacontrol/FetchImageHelper.h')

diff --git a/dom/media/mediacontrol/FetchImageHelper.h b/dom/media/mediacontrol/FetchImageHelper.h
new file mode 100644
index 0000000000..eb3e719610
--- /dev/null
+++ b/dom/media/mediacontrol/FetchImageHelper.h
@@ -0,0 +1,82 @@
+/* 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_
-- 
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