117 lines
2.5 KiB
C++
117 lines
2.5 KiB
C++
#include "precompiled.h"
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# include <string.h>
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# include "sr_image.h"
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//=========================== SrImage ============================
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SrImage::SrImage ()
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{
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_w = _h = _tw = 0;
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_data = 0;
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}
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SrImage::~SrImage ()
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{
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delete _data;
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}
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void SrImage::alloc ( int w, int h )
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{
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int newsize = w*h*3;
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if ( newsize!=_tw*_h )
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{
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delete _data;
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if ( w<=0 || h<=0 ) w=h=0;
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if ( w )
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_data = new srbyte [ newsize ]; // to hold rgb values
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else
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_data = 0;
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}
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_tw = 3*w;
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_w = w;
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_h = h;
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}
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void SrImage::vertical_mirror ()
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{
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int i, ie, mid;
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mid = _h/2;
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srbyte* buf = new srbyte [ _tw ];
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for ( i=0,ie=_h-1; i<mid; i++,ie-- )
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{ memcpy ( buf, line(i), _tw );
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memcpy ( line(i), line(ie), _tw );
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memcpy ( line(ie), buf, _tw );
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}
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delete buf;
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}
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# define PutInt(i) fwrite(&i,4/*bytes*/,1/*num items*/,f)
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# define PutShort(s) fwrite(&s,2/*bytes*/,1/*num items*/,f)
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bool SrImage::save_as_bmp ( const char* filename )
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{
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FILE* f = fopen ( filename, "wb" );
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if ( !f ) return false;
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int i = 0;
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int offset = 14+40;
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//int dw = 4-(_w%4); if ( dw==4 ) dw=0;
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int dw = (_w%4);
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int filesize = 14 /*header*/ + 40 /*info*/ + (_w*_h*3) +(_h*dw);
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// 14 bytes of header:
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fprintf ( f, "BM" ); // 2 bytes : signature
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PutInt ( filesize ); // file size
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PutInt ( i ); // reserved (zeros)
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PutInt ( offset ); // offset to the data
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// 40 bytes of info header:
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int infosize = 40;
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short planes = 1;
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short bits = 24;
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int compression = 0; // no compression
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int compsize = 0; // no compression
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int hres = 600;
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int vres = 600;
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int colors = 0;
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int impcolors = 0; // important colors: all
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PutInt ( infosize ); // size of info header
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PutInt ( _w ); // width
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PutInt ( _h ); // height
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PutShort ( planes );
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PutShort ( bits );
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PutInt ( compression );
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PutInt ( compsize );
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PutInt ( hres );
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PutInt ( vres );
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PutInt ( colors );
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PutInt ( impcolors );
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int w, h;
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srbyte* scanline;
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for ( h=_h-1; h>=0; h-- )
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{ scanline = line(h);
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for ( w=0; w<_tw; w+=3 )
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{ fputc ( scanline[w+2], f ); // B
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fputc ( scanline[w+1], f ); // G
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fputc ( scanline[w], f ); // R
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}
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for ( w=0; w<dw; w++ ) fputc ( 0, f );
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}
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fclose ( f );
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return true;
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}
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//============================= end of file ==========================
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