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/*
* @file llpngwrapper.h
*
* $LicenseInfo:firstyear=2007&license=viewergpl$
*
* Copyright (c) 2007, Linden Research, Inc.
*
* Second Life Viewer Source Code
* The source code in this file ("Source Code") is provided by Linden Lab
* to you under the terms of the GNU General Public License, version 2.0
* ("GPL"), unless you have obtained a separate licensing agreement
* ("Other License"), formally executed by you and Linden Lab. Terms of
* the GPL can be found in doc/GPL-license.txt in this distribution, or
* online at http://secondlife.com/developers/opensource/gplv2
*
* There are special exceptions to the terms and conditions of the GPL as
* it is applied to this Source Code. View the full text of the exception
* in the file doc/FLOSS-exception.txt in this software distribution, or
* online at http://secondlife.com/developers/opensource/flossexception
*
* By copying, modifying or distributing this software, you acknowledge
* that you have read and understood your obligations described above,
* and agree to abide by those obligations.
*
* ALL LINDEN LAB SOURCE CODE IS PROVIDED "AS IS." LINDEN LAB MAKES NO
* WARRANTIES, EXPRESS, IMPLIED OR OTHERWISE, REGARDING ITS ACCURACY,
* COMPLETENESS OR PERFORMANCE.
* $/LicenseInfo$
*/
#ifndef LL_LLPNGWRAPPER_H
#define LL_LLPNGWRAPPER_H
#include "libpng12/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, LLImageRaw* rawImage, ImageInfo *infop = NULL);
BOOL writePng(const LLImageRaw* rawImage, U8* dst);
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;
};
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;
bool mHasBKGD;
png_color_16p mBackgroundColor;
F64 mGamma;
std::string mErrorMessage;
};
#endif
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