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88 lines
2.6 KiB
Plaintext
88 lines
2.6 KiB
Plaintext
/*
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This is a Optical-Character-Recognition program
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Copyright (C) 1999 Joerg Schulenburg
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This program is free software; you can redistribute it and/or
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modify it under the terms of the GNU General Public License
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as published by the Free Software Foundation; either version 2
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of the License, or (at your option) any later version.
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This program is distributed in the hope that it will be useful,
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but WITHOUT ANY WARRANTY; without even the implied warranty of
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MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
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GNU General Public License for more details.
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You should have received a copy of the GNU General Public License
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along with this program; if not, write to the Free Software
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Foundation, Inc., 59 Temple Place - Suite 330, Boston, MA 02111-1307, USA.
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see README for EMAIL-address
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*/
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#include <stdio.h>
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#include <stdlib.h>
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#include <assert.h>
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#include "tga.h"
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typedef unsigned char byte;
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// --- needed for reading TGA-files
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#if 0
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char read_b(FILE *f1){ // filter #-comments
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char c;
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c=fgetc(f1); assert(!feof(f1)); assert(!ferror(f1));
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return c;
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}
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#endif
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//byte tga[18]={ 0, 0, 2, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0,24,32};
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/* header_hex= 00 00 02 00 00 00 00 00 00 00 00 00 xl xh yl yh
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* 18 20 -- -- -- -- -- -- -- -- -- -- -- -- -- -- */
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void readtga(char *name,pix *p,int mode){ // see pcx.format.txt
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// mode: 0=gray,1=RGB
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int nx,ny,i,x,y;
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FILE *f1;
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unsigned char *pic,h[18];
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f1=fopen(name,"rb"); if(!f1) fprintf(stderr," error opening file\n");
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assert(f1); // open-error
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assert(fread(h,1,18,f1)==18); /* 18 Byte lesen -> h[] */
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assert(h[ 0]== 0); // TGA0
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assert(h[ 1]== 0); // TGA1
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assert(h[ 2]== 2); // TGA2 no run length encoding
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for(i=3;i<12;i++)
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assert(h[ i]== 0); // ???
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assert(h[16]==0x18); // TGA16
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assert(h[17]==0x20); // TGA17
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nx = h[12] + (h[13]<<8); /* x-dimension low high */
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ny = h[14] + (h[15]<<8); /* y-dimension low high */
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fprintf(stderr,"# TGA version=%d x=%d y=%d", h[2],nx,ny );
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fflush(stdout);
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pic=(unsigned char *)malloc( 3*nx*ny );
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assert(pic!=NULL); // no memory
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assert(ny==(int)fread(pic,3*nx,ny,f1)); // read all lines BGR
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if(mode==0)
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{
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for(y=0;y<ny;y++) /* BGR => gray */
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for(x=0;x<nx;x++)
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{ i=x+y*nx; pic[i]=(pic[i*3+0]+pic[i*3+1]+pic[i*3+2])/3; }
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}
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else
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if(mode==1)
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{
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byte b;
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for(y=0;y<ny;y++) /* BGR => RGB */
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for(x=0;x<nx;x++)
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{ i=x+y*nx; b=pic[i*3+0]; pic[i*3+0]=pic[i*3+2]; pic[i*3+2]=b; }
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}
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else assert(0); // wrong mode
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fclose(f1);
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p->p=pic; p->x=nx; p->y=ny; p->bpp=1+2*mode;
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fprintf(stderr," mode=%d\n",mode);
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}
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// ------------------------------------------------------------------------
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