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comparison: image/encoders/png/nsPNGEncoder.h
image/encoders/png/nsPNGEncoder.h
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| 1 /* -*- Mode: C++; tab-width: 2; indent-tabs-mode: nil; c-basic-offset: 2 -*- | |
| 2 * This Source Code Form is subject to the terms of the Mozilla Public | |
| 3 * License, v. 2.0. If a copy of the MPL was not distributed with this | |
| 4 * file, You can obtain one at http://mozilla.org/MPL/2.0/. */ | |
| 5 | |
| 6 #include "mozilla/Attributes.h" | |
| 7 #include "mozilla/ReentrantMonitor.h" | |
| 8 | |
| 9 #include "imgIEncoder.h" | |
| 10 | |
| 11 #include "nsCOMPtr.h" | |
| 12 | |
| 13 #include <png.h> | |
| 14 | |
| 15 #define NS_PNGENCODER_CID \ | |
| 16 { /* 38d1592e-b81e-432b-86f8-471878bbfe07 */ \ | |
| 17 0x38d1592e, \ | |
| 18 0xb81e, \ | |
| 19 0x432b, \ | |
| 20 {0x86, 0xf8, 0x47, 0x18, 0x78, 0xbb, 0xfe, 0x07} \ | |
| 21 } | |
| 22 | |
| 23 // Provides PNG encoding functionality. Use InitFromData() to do the | |
| 24 // encoding. See that function definition for encoding options. | |
| 25 | |
| 26 class nsPNGEncoder MOZ_FINAL : public imgIEncoder | |
| 27 { | |
| 28 typedef mozilla::ReentrantMonitor ReentrantMonitor; | |
| 29 public: | |
| 30 NS_DECL_THREADSAFE_ISUPPORTS | |
| 31 NS_DECL_IMGIENCODER | |
| 32 NS_DECL_NSIINPUTSTREAM | |
| 33 NS_DECL_NSIASYNCINPUTSTREAM | |
| 34 | |
| 35 nsPNGEncoder(); | |
| 36 ~nsPNGEncoder(); | |
| 37 | |
| 38 protected: | |
| 39 nsresult ParseOptions(const nsAString& aOptions, | |
| 40 bool* useTransparency, | |
| 41 bool* skipFirstFrame, | |
| 42 uint32_t* numAnimatedFrames, | |
| 43 uint32_t* numIterations, | |
| 44 uint32_t* frameDispose, | |
| 45 uint32_t* frameBlend, | |
| 46 uint32_t* frameDelay, | |
| 47 uint32_t* offsetX, | |
| 48 uint32_t* offsetY); | |
| 49 void ConvertHostARGBRow(const uint8_t* aSrc, uint8_t* aDest, | |
| 50 uint32_t aPixelWidth, bool aUseTransparency); | |
| 51 void StripAlpha(const uint8_t* aSrc, uint8_t* aDest, | |
| 52 uint32_t aPixelWidth); | |
| 53 static void WarningCallback(png_structp png_ptr, png_const_charp warning_msg); | |
| 54 static void ErrorCallback(png_structp png_ptr, png_const_charp error_msg); | |
| 55 static void WriteCallback(png_structp png, png_bytep data, png_size_t size); | |
| 56 void NotifyListener(); | |
| 57 | |
| 58 png_struct* mPNG; | |
| 59 png_info* mPNGinfo; | |
| 60 | |
| 61 bool mIsAnimation; | |
| 62 bool mFinished; | |
| 63 | |
| 64 // image buffer | |
| 65 uint8_t* mImageBuffer; | |
| 66 uint32_t mImageBufferSize; | |
| 67 uint32_t mImageBufferUsed; | |
| 68 | |
| 69 uint32_t mImageBufferReadPoint; | |
| 70 | |
| 71 nsCOMPtr<nsIInputStreamCallback> mCallback; | |
| 72 nsCOMPtr<nsIEventTarget> mCallbackTarget; | |
| 73 uint32_t mNotifyThreshold; | |
| 74 | |
| 75 /* | |
| 76 nsPNGEncoder is designed to allow one thread to pump data into it while another | |
| 77 reads from it. We lock to ensure that the buffer remains append-only while | |
| 78 we read from it (that it is not realloced) and to ensure that only one thread | |
| 79 dispatches a callback for each call to AsyncWait. | |
| 80 */ | |
| 81 ReentrantMonitor mReentrantMonitor; | |
| 82 }; |
