1 files changed, 81 insertions, 0 deletions
diff --git a/image/MultipartImage.h b/image/MultipartImage.h
new file mode 100644
index 0000000000..d4dbb845c0
--- /dev/null
+++ b/image/MultipartImage.h
@@ -0,0 +1,81 @@
+/* -*- 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/. */
+
+#ifndef mozilla_image_MultipartImage_h
+#define mozilla_image_MultipartImage_h
+
+#include "ImageWrapper.h"
+#include "IProgressObserver.h"
+#include "ProgressTracker.h"
+
+namespace mozilla {
+namespace image {
+
+class NextPartObserver;
+
+/**
+ * An Image wrapper that implements support for multipart/x-mixed-replace
+ * images.
+ */
+class MultipartImage : public ImageWrapper, public IProgressObserver {
+ public:
+  MOZ_DECLARE_REFCOUNTED_TYPENAME(MultipartImage)
+  // We need to always declare refcounting here, because
+  // IProgressObserver has pure-virtual refcounting.
+  NS_DECL_ISUPPORTS_INHERITED
+
+  void BeginTransitionToPart(Image* aNextPart);
+
+  // Overridden ImageWrapper methods:
+  virtual already_AddRefed<imgIContainer> Unwrap() override;
+  virtual already_AddRefed<ProgressTracker> GetProgressTracker() override;
+  virtual void SetProgressTracker(ProgressTracker* aTracker) override;
+  virtual nsresult OnImageDataAvailable(nsIRequest* aRequest,
+                                        nsIInputStream* aInStr,
+                                        uint64_t aSourceOffset,
+                                        uint32_t aCount) override;
+  virtual nsresult OnImageDataComplete(nsIRequest* aRequest, nsresult aStatus,
+                                       bool aLastPart) override;
+
+  // We don't support locking or track animation consumers for individual parts,
+  // so we override these methods to do nothing.
+  NS_IMETHOD LockImage() override { return NS_OK; }
+  NS_IMETHOD UnlockImage() override { return NS_OK; }
+  virtual void IncrementAnimationConsumers() override {}
+  virtual void DecrementAnimationConsumers() override {}
+#ifdef DEBUG
+  virtual uint32_t GetAnimationConsumers() override { return 1; }
+#endif
+
+  // Overridden IProgressObserver methods:
+  virtual void Notify(int32_t aType, const nsIntRect* aRect = nullptr) override;
+  virtual void OnLoadComplete(bool aLastPart) override;
+  virtual void SetHasImage() override;
+  virtual bool NotificationsDeferred() const override;
+  virtual void MarkPendingNotify() override;
+  virtual void ClearPendingNotify() override;
+
+ protected:
+  virtual ~MultipartImage();
+
+ private:
+  friend class ImageFactory;
+  friend class NextPartObserver;
+
+  explicit MultipartImage(Image* aFirstPart);
+  void Init();
+
+  void FinishTransition();
+
+  RefPtr<ProgressTracker> mTracker;
+  RefPtr<NextPartObserver> mNextPartObserver;
+  RefPtr<Image> mNextPart;
+  bool mPendingNotify : 1;
+};
+
+}  // namespace image
+}  // namespace mozilla
+
+#endif  // mozilla_image_MultipartImage_h