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-rw-r--r--image/encoders/jpeg/nsJPEGEncoder.h84
1 files changed, 84 insertions, 0 deletions
diff --git a/image/encoders/jpeg/nsJPEGEncoder.h b/image/encoders/jpeg/nsJPEGEncoder.h
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index 000000000..2bcf5c2f3
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+++ b/image/encoders/jpeg/nsJPEGEncoder.h
@@ -0,0 +1,84 @@
+/* -*- 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_encoders_jpeg_nsJPEGEncoder_h
+#define mozilla_image_encoders_jpeg_nsJPEGEncoder_h
+
+#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 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;
+};
+
+#endif // mozilla_image_encoders_jpeg_nsJPEGEncoder_h