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/* -*- 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_png_nsPNGEncoder_h
#define mozilla_image_encoders_png_nsPNGEncoder_h
#include <png.h>
#include "imgIEncoder.h"
#include "nsCOMPtr.h"
#include "mozilla/Attributes.h"
#include "mozilla/ReentrantMonitor.h"
#define NS_PNGENCODER_CID \
{ /* 38d1592e-b81e-432b-86f8-471878bbfe07 */ \
0x38d1592e, 0xb81e, 0x432b, { \
0x86, 0xf8, 0x47, 0x18, 0x78, 0xbb, 0xfe, 0x07 \
} \
}
// Provides PNG encoding functionality. Use InitFromData() to do the
// encoding. See that function definition for encoding options.
class nsPNGEncoder final : public imgIEncoder {
typedef mozilla::ReentrantMonitor ReentrantMonitor;
public:
NS_DECL_THREADSAFE_ISUPPORTS
NS_DECL_IMGIENCODER
NS_DECL_NSIINPUTSTREAM
NS_DECL_NSIASYNCINPUTSTREAM
nsPNGEncoder();
protected:
~nsPNGEncoder();
nsresult ParseOptions(const nsAString& aOptions, bool* useTransparency,
bool* skipFirstFrame, uint32_t* numAnimatedFrames,
uint32_t* numIterations, int* zlibLevel, int* filters,
uint32_t* frameDispose, uint32_t* frameBlend,
uint32_t* frameDelay, uint32_t* offsetX,
uint32_t* offsetY);
void ConvertHostARGBRow(const uint8_t* aSrc, uint8_t* aDest,
uint32_t aPixelWidth, bool aUseTransparency);
void StripAlpha(const uint8_t* aSrc, uint8_t* aDest, uint32_t aPixelWidth);
static void WarningCallback(png_structp png_ptr, png_const_charp warning_msg);
static void ErrorCallback(png_structp png_ptr, png_const_charp error_msg);
static void WriteCallback(png_structp png, png_bytep data, png_size_t size);
void NullOutImageBuffer();
void NotifyListener();
png_struct* mPNG;
png_info* mPNGinfo;
bool mIsAnimation;
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;
// nsPNGEncoder 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 MOZ_UNANNOTATED;
};
#endif // mozilla_image_encoders_png_nsPNGEncoder_h
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