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