image/encoders/png/nsPNGEncoder.h@ca08bd8f51b2 (annotated)
image/encoders/png/nsPNGEncoder.h
Wed, 31 Dec 2014 06:55:46 +0100
- author
- Michael Schloh von Bennewitz <michael@schloh.com>
- date
- Wed, 31 Dec 2014 06:55:46 +0100
- changeset 1
- ca08bd8f51b2
- permissions
- -rw-r--r--
Added tag TORBROWSER_REPLICA for changeset 6474c204b198
| 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 "mozilla/Attributes.h" |
| michael@0 | 7 | #include "mozilla/ReentrantMonitor.h" |
| michael@0 | 8 | |
| michael@0 | 9 | #include "imgIEncoder.h" |
| michael@0 | 10 | |
| michael@0 | 11 | #include "nsCOMPtr.h" |
| michael@0 | 12 | |
| michael@0 | 13 | #include <png.h> |
| michael@0 | 14 | |
| michael@0 | 15 | #define NS_PNGENCODER_CID \ |
| michael@0 | 16 | { /* 38d1592e-b81e-432b-86f8-471878bbfe07 */ \ |
| michael@0 | 17 | 0x38d1592e, \ |
| michael@0 | 18 | 0xb81e, \ |
| michael@0 | 19 | 0x432b, \ |
| michael@0 | 20 | {0x86, 0xf8, 0x47, 0x18, 0x78, 0xbb, 0xfe, 0x07} \ |
| michael@0 | 21 | } |
| michael@0 | 22 | |
| michael@0 | 23 | // Provides PNG encoding functionality. Use InitFromData() to do the |
| michael@0 | 24 | // encoding. See that function definition for encoding options. |
| michael@0 | 25 | |
| michael@0 | 26 | class nsPNGEncoder MOZ_FINAL : public imgIEncoder |
| michael@0 | 27 | { |
| michael@0 | 28 | typedef mozilla::ReentrantMonitor ReentrantMonitor; |
| michael@0 | 29 | public: |
| michael@0 | 30 | NS_DECL_THREADSAFE_ISUPPORTS |
| michael@0 | 31 | NS_DECL_IMGIENCODER |
| michael@0 | 32 | NS_DECL_NSIINPUTSTREAM |
| michael@0 | 33 | NS_DECL_NSIASYNCINPUTSTREAM |
| michael@0 | 34 | |
| michael@0 | 35 | nsPNGEncoder(); |
| michael@0 | 36 | ~nsPNGEncoder(); |
| michael@0 | 37 | |
| michael@0 | 38 | protected: |
| michael@0 | 39 | nsresult ParseOptions(const nsAString& aOptions, |
| michael@0 | 40 | bool* useTransparency, |
| michael@0 | 41 | bool* skipFirstFrame, |
| michael@0 | 42 | uint32_t* numAnimatedFrames, |
| michael@0 | 43 | uint32_t* numIterations, |
| michael@0 | 44 | uint32_t* frameDispose, |
| michael@0 | 45 | uint32_t* frameBlend, |
| michael@0 | 46 | uint32_t* frameDelay, |
| michael@0 | 47 | uint32_t* offsetX, |
| michael@0 | 48 | uint32_t* offsetY); |
| michael@0 | 49 | void ConvertHostARGBRow(const uint8_t* aSrc, uint8_t* aDest, |
| michael@0 | 50 | uint32_t aPixelWidth, bool aUseTransparency); |
| michael@0 | 51 | void StripAlpha(const uint8_t* aSrc, uint8_t* aDest, |
| michael@0 | 52 | uint32_t aPixelWidth); |
| michael@0 | 53 | static void WarningCallback(png_structp png_ptr, png_const_charp warning_msg); |
| michael@0 | 54 | static void ErrorCallback(png_structp png_ptr, png_const_charp error_msg); |
| michael@0 | 55 | static void WriteCallback(png_structp png, png_bytep data, png_size_t size); |
| michael@0 | 56 | void NotifyListener(); |
| michael@0 | 57 | |
| michael@0 | 58 | png_struct* mPNG; |
| michael@0 | 59 | png_info* mPNGinfo; |
| michael@0 | 60 | |
| michael@0 | 61 | bool mIsAnimation; |
| michael@0 | 62 | bool mFinished; |
| michael@0 | 63 | |
| michael@0 | 64 | // image buffer |
| michael@0 | 65 | uint8_t* mImageBuffer; |
| michael@0 | 66 | uint32_t mImageBufferSize; |
| michael@0 | 67 | uint32_t mImageBufferUsed; |
| michael@0 | 68 | |
| michael@0 | 69 | uint32_t mImageBufferReadPoint; |
| michael@0 | 70 | |
| michael@0 | 71 | nsCOMPtr<nsIInputStreamCallback> mCallback; |
| michael@0 | 72 | nsCOMPtr<nsIEventTarget> mCallbackTarget; |
| michael@0 | 73 | uint32_t mNotifyThreshold; |
| michael@0 | 74 | |
| michael@0 | 75 | /* |
| michael@0 | 76 | nsPNGEncoder is designed to allow one thread to pump data into it while another |
| michael@0 | 77 | reads from it. We lock to ensure that the buffer remains append-only while |
| michael@0 | 78 | we read from it (that it is not realloced) and to ensure that only one thread |
| michael@0 | 79 | dispatches a callback for each call to AsyncWait. |
| michael@0 | 80 | */ |
| michael@0 | 81 | ReentrantMonitor mReentrantMonitor; |
| michael@0 | 82 | }; |
