#ifndef __PNG_WRITER_H__ #define __PNG_WRITER_H__ #include "PNG.h" #include #include typedef bool PNGWriteByteFunction(void *context,uint8_t byte); typedef void *PNGGetPixelFunction(void *source,uint8_t *rgba,int x,int y); static bool StartPNGChunk(PNGWriteByteFunction *writefunc,void *context,uint32_t id,uint32_t size,uint32_t *crc); static bool EndPNGChunk(PNGWriteByteFunction *writefunc,void *context,uint32_t *crc); static bool WritePNGUInt32(PNGWriteByteFunction *writefunc,void *context,uint32_t val); static bool WritePNGChunkByte(PNGWriteByteFunction *writefunc,void *context,uint8_t byte,uint32_t *crc); static bool WritePNGChunkUInt32(PNGWriteByteFunction *writefunc,void *context,uint32_t val,uint32_t *crc); static bool WritePNGDeflateByte(PNGWriteByteFunction *writefunc,void *context,uint8_t byte,uint32_t streamsize,uint32_t *streampos,uint32_t *adler,uint32_t *crc); static inline bool WritePNGByte(PNGWriteByteFunction *writefunc,void *context,uint8_t byte) { return writefunc(context,byte); } static bool SavePNG(PNGWriteByteFunction *writefunc,void *context,int width,int height, PNGGetPixelFunction *pixelfunc,void *source) { if(!WritePNGByte(writefunc,context,137)) return false; if(!WritePNGByte(writefunc,context,80)) return false; if(!WritePNGByte(writefunc,context,78)) return false; if(!WritePNGByte(writefunc,context,71)) return false; if(!WritePNGByte(writefunc,context,13)) return false; if(!WritePNGByte(writefunc,context,10)) return false; if(!WritePNGByte(writefunc,context,26)) return false; if(!WritePNGByte(writefunc,context,10)) return false; uint32_t crc; if(!StartPNGChunk(writefunc,context,PNGMakeID('I','H','D','R'),13,&crc)) return false; if(!WritePNGChunkUInt32(writefunc,context,width,&crc)) return false; if(!WritePNGChunkUInt32(writefunc,context,height,&crc)) return false; if(!WritePNGChunkByte(writefunc,context,8,&crc)) return false; if(!WritePNGChunkByte(writefunc,context,6,&crc)) return false; if(!WritePNGChunkByte(writefunc,context,0,&crc)) return false; if(!WritePNGChunkByte(writefunc,context,0,&crc)) return false; if(!WritePNGChunkByte(writefunc,context,0,&crc)) return false; if(!EndPNGChunk(writefunc,context,&crc)) return false; uint32_t streamsize=(width*4+1)*height; uint32_t chunksize=streamsize+((streamsize-1)/65535+1)*5+6; if(!StartPNGChunk(writefunc,context,PNGMakeID('I','D','A','T'),chunksize,&crc)) return false; if(!WritePNGChunkByte(writefunc,context,0x78,&crc)) return false; if(!WritePNGChunkByte(writefunc,context,0x01,&crc)) return false; uint32_t streampos=0; uint32_t adler=1; for(int y=0;y>24,&crc)) return false; if(!WritePNGChunkByte(writefunc,context,adler>>16,&crc)) return false; if(!WritePNGChunkByte(writefunc,context,adler>>8,&crc)) return false; if(!WritePNGChunkByte(writefunc,context,adler,&crc)) return false; if(!EndPNGChunk(writefunc,context,&crc)) return false; if(!StartPNGChunk(writefunc,context,PNGMakeID('I','E','N','D'),0,&crc)) return false; if(!EndPNGChunk(writefunc,context,&crc)) return false; return true; } static bool StartPNGChunk(PNGWriteByteFunction *writefunc,void *context,uint32_t id,uint32_t size,uint32_t *crc) { *crc=0xffffffff; if(!WritePNGUInt32(writefunc,context,size)) return false; if(!WritePNGChunkUInt32(writefunc,context,id,crc)) return false; return true; } static bool EndPNGChunk(PNGWriteByteFunction *writefunc,void *context,uint32_t *crc) { return WritePNGUInt32(writefunc,context,*crc^0xffffffff); } static bool WritePNGUInt32(PNGWriteByteFunction *writefunc,void *context,uint32_t val) { if(!WritePNGByte(writefunc,context,val>>24)) return false; if(!WritePNGByte(writefunc,context,val>>16)) return false; if(!WritePNGByte(writefunc,context,val>>8)) return false; if(!WritePNGByte(writefunc,context,val)) return false; return true; } static bool WritePNGChunkByte(PNGWriteByteFunction *writefunc,void *context,uint8_t byte,uint32_t *crc) { if(!WritePNGByte(writefunc,context,byte)) return false; static const uint32_t crctable[256]= { 0x00000000,0x77073096,0xee0e612c,0x990951ba,0x076dc419,0x706af48f,0xe963a535,0x9e6495a3, 0x0edb8832,0x79dcb8a4,0xe0d5e91e,0x97d2d988,0x09b64c2b,0x7eb17cbd,0xe7b82d07,0x90bf1d91, 0x1db71064,0x6ab020f2,0xf3b97148,0x84be41de,0x1adad47d,0x6ddde4eb,0xf4d4b551,0x83d385c7, 0x136c9856,0x646ba8c0,0xfd62f97a,0x8a65c9ec,0x14015c4f,0x63066cd9,0xfa0f3d63,0x8d080df5, 0x3b6e20c8,0x4c69105e,0xd56041e4,0xa2677172,0x3c03e4d1,0x4b04d447,0xd20d85fd,0xa50ab56b, 0x35b5a8fa,0x42b2986c,0xdbbbc9d6,0xacbcf940,0x32d86ce3,0x45df5c75,0xdcd60dcf,0xabd13d59, 0x26d930ac,0x51de003a,0xc8d75180,0xbfd06116,0x21b4f4b5,0x56b3c423,0xcfba9599,0xb8bda50f, 0x2802b89e,0x5f058808,0xc60cd9b2,0xb10be924,0x2f6f7c87,0x58684c11,0xc1611dab,0xb6662d3d, 0x76dc4190,0x01db7106,0x98d220bc,0xefd5102a,0x71b18589,0x06b6b51f,0x9fbfe4a5,0xe8b8d433, 0x7807c9a2,0x0f00f934,0x9609a88e,0xe10e9818,0x7f6a0dbb,0x086d3d2d,0x91646c97,0xe6635c01, 0x6b6b51f4,0x1c6c6162,0x856530d8,0xf262004e,0x6c0695ed,0x1b01a57b,0x8208f4c1,0xf50fc457, 0x65b0d9c6,0x12b7e950,0x8bbeb8ea,0xfcb9887c,0x62dd1ddf,0x15da2d49,0x8cd37cf3,0xfbd44c65, 0x4db26158,0x3ab551ce,0xa3bc0074,0xd4bb30e2,0x4adfa541,0x3dd895d7,0xa4d1c46d,0xd3d6f4fb, 0x4369e96a,0x346ed9fc,0xad678846,0xda60b8d0,0x44042d73,0x33031de5,0xaa0a4c5f,0xdd0d7cc9, 0x5005713c,0x270241aa,0xbe0b1010,0xc90c2086,0x5768b525,0x206f85b3,0xb966d409,0xce61e49f, 0x5edef90e,0x29d9c998,0xb0d09822,0xc7d7a8b4,0x59b33d17,0x2eb40d81,0xb7bd5c3b,0xc0ba6cad, 0xedb88320,0x9abfb3b6,0x03b6e20c,0x74b1d29a,0xead54739,0x9dd277af,0x04db2615,0x73dc1683, 0xe3630b12,0x94643b84,0x0d6d6a3e,0x7a6a5aa8,0xe40ecf0b,0x9309ff9d,0x0a00ae27,0x7d079eb1, 0xf00f9344,0x8708a3d2,0x1e01f268,0x6906c2fe,0xf762575d,0x806567cb,0x196c3671,0x6e6b06e7, 0xfed41b76,0x89d32be0,0x10da7a5a,0x67dd4acc,0xf9b9df6f,0x8ebeeff9,0x17b7be43,0x60b08ed5, 0xd6d6a3e8,0xa1d1937e,0x38d8c2c4,0x4fdff252,0xd1bb67f1,0xa6bc5767,0x3fb506dd,0x48b2364b, 0xd80d2bda,0xaf0a1b4c,0x36034af6,0x41047a60,0xdf60efc3,0xa867df55,0x316e8eef,0x4669be79, 0xcb61b38c,0xbc66831a,0x256fd2a0,0x5268e236,0xcc0c7795,0xbb0b4703,0x220216b9,0x5505262f, 0xc5ba3bbe,0xb2bd0b28,0x2bb45a92,0x5cb36a04,0xc2d7ffa7,0xb5d0cf31,0x2cd99e8b,0x5bdeae1d, 0x9b64c2b0,0xec63f226,0x756aa39c,0x026d930a,0x9c0906a9,0xeb0e363f,0x72076785,0x05005713, 0x95bf4a82,0xe2b87a14,0x7bb12bae,0x0cb61b38,0x92d28e9b,0xe5d5be0d,0x7cdcefb7,0x0bdbdf21, 0x86d3d2d4,0xf1d4e242,0x68ddb3f8,0x1fda836e,0x81be16cd,0xf6b9265b,0x6fb077e1,0x18b74777, 0x88085ae6,0xff0f6a70,0x66063bca,0x11010b5c,0x8f659eff,0xf862ae69,0x616bffd3,0x166ccf45, 0xa00ae278,0xd70dd2ee,0x4e048354,0x3903b3c2,0xa7672661,0xd06016f7,0x4969474d,0x3e6e77db, 0xaed16a4a,0xd9d65adc,0x40df0b66,0x37d83bf0,0xa9bcae53,0xdebb9ec5,0x47b2cf7f,0x30b5ffe9, 0xbdbdf21c,0xcabac28a,0x53b39330,0x24b4a3a6,0xbad03605,0xcdd70693,0x54de5729,0x23d967bf, 0xb3667a2e,0xc4614ab8,0x5d681b02,0x2a6f2b94,0xb40bbe37,0xc30c8ea1,0x5a05df1b,0x2d02ef8d, }; *crc=crctable[(*crc^byte)&0xff]^(*crc>>8); return true; } static bool WritePNGChunkUInt32(PNGWriteByteFunction *writefunc,void *context,uint32_t val,uint32_t *crc) { if(!WritePNGChunkByte(writefunc,context,val>>24,crc)) return false; if(!WritePNGChunkByte(writefunc,context,val>>16,crc)) return false; if(!WritePNGChunkByte(writefunc,context,val>>8,crc)) return false; if(!WritePNGChunkByte(writefunc,context,val,crc)) return false; return true; } static bool WritePNGDeflateByte(PNGWriteByteFunction *writefunc,void *context,uint8_t byte,uint32_t streamsize,uint32_t *streampos,uint32_t *adler,uint32_t *crc) { if(*streampos%65535==0) { int blocksize; if(*streampos+65535>8,crc)) return false; if(!WritePNGChunkByte(writefunc,context,blocksize^0xff,crc)) return false; if(!WritePNGChunkByte(writefunc,context,(blocksize>>8)^0xff,crc)) return false; } if(!WritePNGChunkByte(writefunc,context,byte,crc)) return false; int s1=*adler&0xffff; int s2=*adler>>16; s1=(s1+byte)%65521; s2=(s2+s1)%65521; *adler=(s2<<16)|s1; (*streampos)++; return true; } #endif