diff -r 000000000000 -r 6474c204b198 image/encoders/jpeg/nsJPEGEncoder.h
--- /dev/null	Thu Jan 01 00:00:00 1970 +0000
+++ b/image/encoders/jpeg/nsJPEGEncoder.h	Wed Dec 31 06:09:35 2014 +0100
@@ -0,0 +1,79 @@
+/* -*- 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/. */
+
+#include "imgIEncoder.h"
+
+#include "mozilla/ReentrantMonitor.h"
+#include "mozilla/Attributes.h"
+
+#include "nsCOMPtr.h"
+
+// needed for JPEG library
+#include <stdio.h>
+
+extern "C" {
+#include "jpeglib.h"
+}
+
+#define NS_JPEGENCODER_CID \
+{ /* ac2bb8fe-eeeb-4572-b40f-be03932b56e0 */         \
+     0xac2bb8fe,                                     \
+     0xeeeb,                                         \
+     0x4572,                                         \
+    {0xb4, 0x0f, 0xbe, 0x03, 0x93, 0x2b, 0x56, 0xe0} \
+}
+
+// Provides JPEG encoding functionality. Use InitFromData() to do the
+// encoding. See that function definition for encoding options.
+
+class nsJPEGEncoder MOZ_FINAL : public imgIEncoder
+{
+  typedef mozilla::ReentrantMonitor ReentrantMonitor;
+public:
+  NS_DECL_THREADSAFE_ISUPPORTS
+  NS_DECL_IMGIENCODER
+  NS_DECL_NSIINPUTSTREAM
+  NS_DECL_NSIASYNCINPUTSTREAM
+
+  nsJPEGEncoder();
+
+private:
+  ~nsJPEGEncoder();
+
+protected:
+
+  void ConvertHostARGBRow(const uint8_t* aSrc, uint8_t* aDest,
+                          uint32_t aPixelWidth);
+  void ConvertRGBARow(const uint8_t* aSrc, uint8_t* aDest, uint32_t aPixelWidth);
+
+  static void initDestination(jpeg_compress_struct* cinfo);
+  static boolean emptyOutputBuffer(jpeg_compress_struct* cinfo);
+  static void termDestination(jpeg_compress_struct* cinfo);
+
+  static void errorExit(jpeg_common_struct* cinfo);
+
+  void NotifyListener();
+
+  bool mFinished;
+
+  // image buffer
+  uint8_t* mImageBuffer;
+  uint32_t mImageBufferSize;
+  uint32_t mImageBufferUsed;
+
+  uint32_t mImageBufferReadPoint;
+
+  nsCOMPtr<nsIInputStreamCallback> mCallback;
+  nsCOMPtr<nsIEventTarget> mCallbackTarget;
+  uint32_t mNotifyThreshold;
+
+  /*
+    nsJPEGEncoder is designed to allow one thread to pump data into it while another
+    reads from it.  We lock to ensure that the buffer remains append-only while
+    we read from it (that it is not realloced) and to ensure that only one thread
+    dispatches a callback for each call to AsyncWait.
+   */
+  ReentrantMonitor mReentrantMonitor;
+};