Message-ID: <379250C4.75E26132@go.ro>
Date: Mon, 19 Jul 1999 01:10:12 +0300
From: Radu Georgescu aka skoola <skoola AT go DOT ro>
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To: djgpp AT delorie DOT com
Subject: Re: decoding pcx header
References: <T_tr3.8837$K%6 DOT 165729 AT news1 DOT rdc2 DOT on DOT home DOT com>
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Reply-To: djgpp AT delorie DOT com

> hey there, I'm having some trouble decoding the pcx header. I hunted down
> the format and everything, but I still can't seem to be able to read the
> dimensions of the image from the header. If anybody knows anywhere I could
> get some info on doing this I'd really appreciate it. Basically, I've tried
> reading it as a text file and as a binary file, and I've tried reading
> character by character and through formatted input (ie using fscanf) but I
> can't seem to get it to work. Anyway, thanks for any help you can offer.

you should read the file as a binary file. there should be something like this:

int loadpcx(char fila[13],long dest,int mem_pitch,int loadpalette,palette pal)
{
FILE *f;
int pcx_width,pcx_height,bpl,y,x;
unsigned char scale,delta,r,g,b,ch,c,*pixel=(unsigned char
*)dest,nume[24]="pcx\\";

delta=(loadpalette>>8)&0xff;
scale=(loadpalette>>16)&0xff;
strcat(nume,fila);
f=fopen(nume,"rb");
if(!f)
   return 1;
getc(f);
getc(f);
getc(f);
c=getc(f);

if(c!=8)
   {
   fclose(f);
   return 2;
   }
pcx_width=getc(f);
pcx_width+=256*getc(f);
pcx_height=getc(f);
pcx_height+=256*getc(f);
pcx_width+=getc(f)+1;
pcx_width+=256*getc(f);
pcx_height+=getc(f)+1;
pcx_height+=256*getc(f);

getc(f);
getc(f);
getc(f);
getc(f);

for(y=0;y<16;y++)
   {
   getc(f);
   getc(f);
   getc(f);
   }
getc(f);
if(getc(f)!=1)
   {
   fclose(f);
   return 3;
   }
bpl=getc(f);
bpl+=256*getc(f);
for(y=0;y<60;y++)
   getc(f);
for(y=0;y<pcx_height;y++)
   {
   x=0;
   while(x<bpl)
      {
      ch=getc(f);
      if((ch&0xC0)==0xC0)
         {
         c=(ch&0x3F);
         ch=getc(f);
         }
      else
         c=1;
      while(c--)
         {
#ifdef PCX_COLOR_KEY
         if(ch!=0xff)
#endif
#ifdef PCX_SHIFT
             *(pixel+x)=(ch+delta)<<scale;
#else
             *(pixel+x)=ch;
#endif
         x++;
         }
      }
   pixel+=mem_pitch;
   }
if((loadpalette&0xff)&&(getc(f)==12))
   {
   for(y=0;y<=255;y++)
      {
      r=getc(f)/4;
      g=getc(f)/4;
      b=getc(f)/4;
      if(loadpalette&1)
         setpal(y,r,g,b);
      if(loadpalette&2)
         {
         pal[y].r=r;
         pal[y].g=g;
         pal[y].b=b;
         }
      }
   }
fclose(f);
return 0;
}