102 lines
2.4 KiB
C++
102 lines
2.4 KiB
C++
/*
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* @file llpngwrapper.h
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*
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* $LicenseInfo:firstyear=2007&license=viewerlgpl$
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* Second Life Viewer Source Code
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* Copyright (C) 2010, Linden Research, Inc.
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*
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* This library is free software; you can redistribute it and/or
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* modify it under the terms of the GNU Lesser General Public
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* License as published by the Free Software Foundation;
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* version 2.1 of the License only.
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*
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* This library is distributed in the hope that it will be useful,
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* but WITHOUT ANY WARRANTY; without even the implied warranty of
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* MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the GNU
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* Lesser General Public License for more details.
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*
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* You should have received a copy of the GNU Lesser General Public
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* License along with this library; if not, write to the Free Software
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* Foundation, Inc., 51 Franklin Street, Fifth Floor, Boston, MA 02110-1301 USA
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*
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* Linden Research, Inc., 945 Battery Street, San Francisco, CA 94111 USA
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* $/LicenseInfo$
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*/
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#ifndef LL_LLPNGWRAPPER_H
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#define LL_LLPNGWRAPPER_H
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#ifdef LL_STANDALONE
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#include <png.h>
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#else
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// Workaround for wrongly packaged prebuilt.
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#include "libpng15/png.h"
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#endif
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#include "llimage.h"
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class LLPngWrapper
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{
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public:
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LLPngWrapper();
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virtual ~LLPngWrapper();
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public:
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struct ImageInfo
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{
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U16 mWidth;
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U16 mHeight;
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S8 mComponents;
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};
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BOOL isValidPng(U8* src);
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BOOL readPng(U8* src, LLImageRaw* rawImage, ImageInfo *infop = NULL);
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BOOL writePng(const LLImageRaw* rawImage, U8* dst);
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U32 getFinalSize();
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const std::string& getErrorMessage();
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protected:
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void normalizeImage();
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void updateMetaData();
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private:
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// Structure for writing/reading PNG data to/from memory
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// as opposed to using a file.
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struct PngDataInfo
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{
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U8 *mData;
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U32 mOffset;
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};
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static void writeFlush(png_structp png_ptr);
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static void errorHandler(png_structp png_ptr, png_const_charp msg);
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static void readDataCallback(png_structp png_ptr, png_bytep dest, png_size_t length);
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static void writeDataCallback(png_structp png_ptr, png_bytep src, png_size_t length);
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void releaseResources();
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png_structp mReadPngPtr;
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png_infop mReadInfoPtr;
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png_structp mWritePngPtr;
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png_infop mWriteInfoPtr;
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U8 **mRowPointers;
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png_uint_32 mWidth;
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png_uint_32 mHeight;
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S32 mBitDepth;
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S32 mColorType;
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S32 mChannels;
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S32 mInterlaceType;
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S32 mCompressionType;
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S32 mFilterMethod;
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U32 mFinalSize;
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F64 mGamma;
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std::string mErrorMessage;
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};
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#endif
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