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