michael@0: /* -*- Mode: C++; tab-width: 2; indent-tabs-mode: nil; c-basic-offset: 2 -*-
michael@0:  * This Source Code Form is subject to the terms of the Mozilla Public
michael@0:  * License, v. 2.0. If a copy of the MPL was not distributed with this
michael@0:  * file, You can obtain one at http://mozilla.org/MPL/2.0/. */
michael@0: 
michael@0: #include "mozilla/Attributes.h"
michael@0: #include "mozilla/ReentrantMonitor.h"
michael@0: 
michael@0: #include "imgIEncoder.h"
michael@0: 
michael@0: #include "nsCOMPtr.h"
michael@0: 
michael@0: #include <png.h>
michael@0: 
michael@0: #define NS_PNGENCODER_CID \
michael@0: { /* 38d1592e-b81e-432b-86f8-471878bbfe07 */         \
michael@0:      0x38d1592e,                                     \
michael@0:      0xb81e,                                         \
michael@0:      0x432b,                                         \
michael@0:     {0x86, 0xf8, 0x47, 0x18, 0x78, 0xbb, 0xfe, 0x07} \
michael@0: }
michael@0: 
michael@0: // Provides PNG encoding functionality. Use InitFromData() to do the
michael@0: // encoding. See that function definition for encoding options.
michael@0: 
michael@0: class nsPNGEncoder MOZ_FINAL : public imgIEncoder
michael@0: {
michael@0:   typedef mozilla::ReentrantMonitor ReentrantMonitor;
michael@0: public:
michael@0:   NS_DECL_THREADSAFE_ISUPPORTS
michael@0:   NS_DECL_IMGIENCODER
michael@0:   NS_DECL_NSIINPUTSTREAM
michael@0:   NS_DECL_NSIASYNCINPUTSTREAM
michael@0: 
michael@0:   nsPNGEncoder();
michael@0:   ~nsPNGEncoder();
michael@0: 
michael@0: protected:
michael@0:   nsresult ParseOptions(const nsAString& aOptions,
michael@0:                         bool* useTransparency,
michael@0:                         bool* skipFirstFrame,
michael@0:                         uint32_t* numAnimatedFrames,
michael@0:                         uint32_t* numIterations,
michael@0:                         uint32_t* frameDispose,
michael@0:                         uint32_t* frameBlend,
michael@0:                         uint32_t* frameDelay,
michael@0:                         uint32_t* offsetX,
michael@0:                         uint32_t* offsetY);
michael@0:   void ConvertHostARGBRow(const uint8_t* aSrc, uint8_t* aDest,
michael@0:                           uint32_t aPixelWidth, bool aUseTransparency);
michael@0:   void StripAlpha(const uint8_t* aSrc, uint8_t* aDest,
michael@0:                   uint32_t aPixelWidth);
michael@0:   static void WarningCallback(png_structp png_ptr, png_const_charp warning_msg);
michael@0:   static void ErrorCallback(png_structp png_ptr, png_const_charp error_msg);
michael@0:   static void WriteCallback(png_structp png, png_bytep data, png_size_t size);
michael@0:   void NotifyListener();
michael@0: 
michael@0:   png_struct* mPNG;
michael@0:   png_info* mPNGinfo;
michael@0: 
michael@0:   bool mIsAnimation;
michael@0:   bool mFinished;
michael@0: 
michael@0:   // image buffer
michael@0:   uint8_t* mImageBuffer;
michael@0:   uint32_t mImageBufferSize;
michael@0:   uint32_t mImageBufferUsed;
michael@0: 
michael@0:   uint32_t mImageBufferReadPoint;
michael@0: 
michael@0:   nsCOMPtr<nsIInputStreamCallback> mCallback;
michael@0:   nsCOMPtr<nsIEventTarget> mCallbackTarget;
michael@0:   uint32_t mNotifyThreshold;
michael@0: 
michael@0:   /*
michael@0:     nsPNGEncoder is designed to allow one thread to pump data into it while another
michael@0:     reads from it.  We lock to ensure that the buffer remains append-only while
michael@0:     we read from it (that it is not realloced) and to ensure that only one thread
michael@0:     dispatches a callback for each call to AsyncWait.
michael@0:    */
michael@0:   ReentrantMonitor mReentrantMonitor;
michael@0: };