image/encoders/jpeg/nsJPEGEncoder.h@ac0c01689b40 (annotated)
image/encoders/jpeg/nsJPEGEncoder.h
Thu, 15 Jan 2015 15:59:08 +0100
- author
- Michael Schloh von Bennewitz <michael@schloh.com>
- date
- Thu, 15 Jan 2015 15:59:08 +0100
- branch
- TOR_BUG_9701
- changeset 10
- ac0c01689b40
- permissions
- -rw-r--r--
Implement a real Private Browsing Mode condition by changing the API/ABI;
This solves Tor bug #9701, complying with disk avoidance documented in
https://www.torproject.org/projects/torbrowser/design/#disk-avoidance.
| michael@0 | 1 | /* -*- Mode: C++; tab-width: 2; indent-tabs-mode: nil; c-basic-offset: 2 -*- |
| michael@0 | 2 | * This Source Code Form is subject to the terms of the Mozilla Public |
| michael@0 | 3 | * License, v. 2.0. If a copy of the MPL was not distributed with this |
| michael@0 | 4 | * file, You can obtain one at http://mozilla.org/MPL/2.0/. */ |
| michael@0 | 5 | |
| michael@0 | 6 | #include "imgIEncoder.h" |
| michael@0 | 7 | |
| michael@0 | 8 | #include "mozilla/ReentrantMonitor.h" |
| michael@0 | 9 | #include "mozilla/Attributes.h" |
| michael@0 | 10 | |
| michael@0 | 11 | #include "nsCOMPtr.h" |
| michael@0 | 12 | |
| michael@0 | 13 | // needed for JPEG library |
| michael@0 | 14 | #include <stdio.h> |
| michael@0 | 15 | |
| michael@0 | 16 | extern "C" { |
| michael@0 | 17 | #include "jpeglib.h" |
| michael@0 | 18 | } |
| michael@0 | 19 | |
| michael@0 | 20 | #define NS_JPEGENCODER_CID \ |
| michael@0 | 21 | { /* ac2bb8fe-eeeb-4572-b40f-be03932b56e0 */ \ |
| michael@0 | 22 | 0xac2bb8fe, \ |
| michael@0 | 23 | 0xeeeb, \ |
| michael@0 | 24 | 0x4572, \ |
| michael@0 | 25 | {0xb4, 0x0f, 0xbe, 0x03, 0x93, 0x2b, 0x56, 0xe0} \ |
| michael@0 | 26 | } |
| michael@0 | 27 | |
| michael@0 | 28 | // Provides JPEG encoding functionality. Use InitFromData() to do the |
| michael@0 | 29 | // encoding. See that function definition for encoding options. |
| michael@0 | 30 | |
| michael@0 | 31 | class nsJPEGEncoder MOZ_FINAL : public imgIEncoder |
| michael@0 | 32 | { |
| michael@0 | 33 | typedef mozilla::ReentrantMonitor ReentrantMonitor; |
| michael@0 | 34 | public: |
| michael@0 | 35 | NS_DECL_THREADSAFE_ISUPPORTS |
| michael@0 | 36 | NS_DECL_IMGIENCODER |
| michael@0 | 37 | NS_DECL_NSIINPUTSTREAM |
| michael@0 | 38 | NS_DECL_NSIASYNCINPUTSTREAM |
| michael@0 | 39 | |
| michael@0 | 40 | nsJPEGEncoder(); |
| michael@0 | 41 | |
| michael@0 | 42 | private: |
| michael@0 | 43 | ~nsJPEGEncoder(); |
| michael@0 | 44 | |
| michael@0 | 45 | protected: |
| michael@0 | 46 | |
| michael@0 | 47 | void ConvertHostARGBRow(const uint8_t* aSrc, uint8_t* aDest, |
| michael@0 | 48 | uint32_t aPixelWidth); |
| michael@0 | 49 | void ConvertRGBARow(const uint8_t* aSrc, uint8_t* aDest, uint32_t aPixelWidth); |
| michael@0 | 50 | |
| michael@0 | 51 | static void initDestination(jpeg_compress_struct* cinfo); |
| michael@0 | 52 | static boolean emptyOutputBuffer(jpeg_compress_struct* cinfo); |
| michael@0 | 53 | static void termDestination(jpeg_compress_struct* cinfo); |
| michael@0 | 54 | |
| michael@0 | 55 | static void errorExit(jpeg_common_struct* cinfo); |
| michael@0 | 56 | |
| michael@0 | 57 | void NotifyListener(); |
| michael@0 | 58 | |
| michael@0 | 59 | bool mFinished; |
| michael@0 | 60 | |
| michael@0 | 61 | // image buffer |
| michael@0 | 62 | uint8_t* mImageBuffer; |
| michael@0 | 63 | uint32_t mImageBufferSize; |
| michael@0 | 64 | uint32_t mImageBufferUsed; |
| michael@0 | 65 | |
| michael@0 | 66 | uint32_t mImageBufferReadPoint; |
| michael@0 | 67 | |
| michael@0 | 68 | nsCOMPtr<nsIInputStreamCallback> mCallback; |
| michael@0 | 69 | nsCOMPtr<nsIEventTarget> mCallbackTarget; |
| michael@0 | 70 | uint32_t mNotifyThreshold; |
| michael@0 | 71 | |
| michael@0 | 72 | /* |
| michael@0 | 73 | nsJPEGEncoder is designed to allow one thread to pump data into it while another |
| michael@0 | 74 | reads from it. We lock to ensure that the buffer remains append-only while |
| michael@0 | 75 | we read from it (that it is not realloced) and to ensure that only one thread |
| michael@0 | 76 | dispatches a callback for each call to AsyncWait. |
| michael@0 | 77 | */ |
| michael@0 | 78 | ReentrantMonitor mReentrantMonitor; |
| michael@0 | 79 | }; |
