forked from Mirrors/openclonk
74 lines
3.0 KiB
C++
74 lines
3.0 KiB
C++
/*
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* OpenClonk, http://www.openclonk.org
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*
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* Copyright (c) 2001-2009, RedWolf Design GmbH, http://www.clonk.de/
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* Copyright (c) 2013-2016, The OpenClonk Team and contributors
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*
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* Distributed under the terms of the ISC license; see accompanying file
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* "COPYING" for details.
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*
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* "Clonk" is a registered trademark of Matthes Bender, used with permission.
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* See accompanying file "TRADEMARK" for details.
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*
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* To redistribute this file separately, substitute the full license texts
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* for the above references.
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*/
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// png file reading functionality
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#ifndef INC_STDPNG
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#define INC_STDPNG
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#include <png.h>
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class CPNGFile
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{
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private:
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BYTE *pFile; // loaded file in mem
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bool fpFileOwned; // whether file ptr was allocated by this class
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int iFileSize; // size of file in mem
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int iPixSize; // size of one pixel in image data mem
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FILE *fp; // opened file for writing
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BYTE *pFilePtr; // current pos in file
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bool fWriteMode; // if set, the following png-structs are write structs
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png_structp png_ptr; // png main struct
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png_infop info_ptr, end_info; // png file info
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BYTE *pImageData; // uncompressed image in memory
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int iRowSize; // size of one row of data (equals pitch)
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void Read(BYTE *pData, int iLength); // read from file
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bool DoLoad(); // perform png-file loading after file data ptr has been set
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public:
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unsigned long iWdt, iHgt; // image size
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int iBPC, iClrType, iIntrlcType, iCmprType, iFltrType; // image data info
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public:
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CPNGFile(); // ctor
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~CPNGFile(); // dtor
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void ClearPngStructs(); // clear internal png structs (png_tr, info_ptr etc.);
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void Default(); // zero fields
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void Clear(); // clear loaded file
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bool Load(BYTE *pFile, int iSize); // load from file that is completely in mem
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DWORD GetPix(int iX, int iY); // get pixel value (rgba) - note that NO BOUNDS CHECKS ARE DONE due to performance reasons!
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// Use ONLY for PNG_COLOR_TYPE_RGB_ALPHA!
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uint32_t * GetRow(int iY)
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{
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return reinterpret_cast<uint32_t *>(pImageData+iY*iRowSize);
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}
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bool Create(int iWdt, int iHgt, bool fAlpha); // create empty image
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bool SetPix(int iX, int iY, DWORD dwValue); // set pixel value
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bool Save(const char *szFilename); // save current image to file; saving to mem is not supported because C4Group doesn't support streamed writing anyway...
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BYTE *GetImageData() { return pImageData; } // return raw image data
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int GetBitsPerPixel(); // return number of bits per pixel in raw image data
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static void ScheduleSaving(CPNGFile *png, const char *filename); // start a background thread to save the png file. then free the passed png.
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static void WaitForSaves(); // wait until all pending saves are finished
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private:
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static void PNGAPI CPNGReadFn(png_structp png_ptr, png_bytep data, size_t length); // reading proc (callback)
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};
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#endif //INC_STDPNG
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