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#include "pcxread.hpp"
#include "specs.hpp"
struct PCX_header_type
{
char manufactururer,version,encoding,bits_per_pixel;
short xmin,ymin,xmax,ymax,hres,vres;
char palette[48];
char reserved,color_planes;
short bytes_per_line,palette_type;
char filter[58];
} PCX_header;
int read_PCX_header(FILE *fp)
{
if (!fread(&PCX_header.manufactururer,1,1,fp)) return 0;
if (!fread(&PCX_header.version,1,1,fp)) return 0;
if (!fread(&PCX_header.encoding,1,1,fp)) return 0;
if (!fread(&PCX_header.bits_per_pixel,1,1,fp)) return 0;
PCX_header.xmin=read_short(fp);
PCX_header.ymin=read_short(fp);
PCX_header.xmax=read_short(fp);
PCX_header.ymax=read_short(fp);
PCX_header.hres=read_short(fp);
PCX_header.vres=read_short(fp);
if (!fread(PCX_header.palette,1,48,fp)) return 0;
if (!fread(&PCX_header.reserved,1,1,fp)) return 0;
if (!fread(&PCX_header.color_planes,1,1,fp)) return 0;
PCX_header.bytes_per_line=read_short(fp);
PCX_header.palette_type=read_short(fp);
if (!fread(PCX_header.filter,1,58,fp)) return 0;
return 1;
}
int write_PCX_header(FILE *fp)
{
if (!fwrite(&PCX_header.manufactururer,1,1,fp)) return 0;
if (!fwrite(&PCX_header.version,1,1,fp)) return 0;
if (!fwrite(&PCX_header.encoding,1,1,fp)) return 0;
if (!fwrite(&PCX_header.bits_per_pixel,1,1,fp)) return 0;
write_short(fp,PCX_header.xmin);
write_short(fp,PCX_header.ymin);
write_short(fp,PCX_header.xmax);
write_short(fp,PCX_header.ymax);
write_short(fp,PCX_header.hres);
write_short(fp,PCX_header.vres);
if (!fwrite(PCX_header.palette,1,48,fp)) return 0;
if (!fwrite(&PCX_header.reserved,1,1,fp)) return 0;
if (!fwrite(&PCX_header.color_planes,1,1,fp)) return 0;
write_short(fp,PCX_header.bytes_per_line);
write_short(fp,PCX_header.palette_type);
if (!fwrite(PCX_header.filter,1,58,fp)) return 0;
return 1;
}
PCX_type PCX_file_type(char *filename)
{
FILE *fp=fopen(filename,"rb");
if (!fp)
{ set_error(imREAD_ERROR);
return not_PCX;
}
if (!read_PCX_header(fp))
{
fclose(fp);
set_error(imREAD_ERROR);
return not_PCX;
}
fclose(fp);
if (PCX_header.manufactururer!=10)
return not_PCX;
if (PCX_header.color_planes==3 && PCX_header.bits_per_pixel==8)
return PCX_24;
else if (PCX_header.color_planes==1 && PCX_header.bits_per_pixel==8)
return PCX_8;
else return not_PCX;
}
void read_PCX_line(FILE *fp, unsigned char *start, short skip, int width)
{
int c,n=0,i;
do
{
c=fgetc(fp)&0xff;
if ((c&0xc0)==0xc0)
{
i=c&0x3f;
c=fgetc(fp);
while (i--)
{
*start=c;
start+=skip;
n++;
}
}
else
{
*start=c;
start+=skip;
n++;
}
} while (n<width);
}
image24 *read_PCX24(char *filename)
{
if (PCX_file_type(filename)!=PCX_24) return NULL;
FILE *fp=fopen(filename,"rb");
read_PCX_header(fp);
image24 *im=new image24(PCX_header.xmax-PCX_header.xmin+1,
PCX_header.ymax-PCX_header.ymin+1);
int y;
for (y=0;y<im->height();y++)
{
read_PCX_line(fp,im->scan_line(y),3,PCX_header.bytes_per_line);
read_PCX_line(fp,im->scan_line(y)+1,3,PCX_header.bytes_per_line);
read_PCX_line(fp,im->scan_line(y)+2,3,PCX_header.bytes_per_line);
}
fclose(fp);
return im;
}
image *read_PCX(char *filename, palette *&pal)
{
if (PCX_file_type(filename)!=PCX_8) return NULL;
FILE *fp=fopen(filename,"rb");
read_PCX_header(fp);
image *im=new image(PCX_header.xmax-PCX_header.xmin+1,
PCX_header.ymax-PCX_header.ymin+1);
int y;
for (y=0;y<im->height();y++)
read_PCX_line(fp,im->scan_line(y),1,PCX_header.bytes_per_line);
unsigned char palette_confirm;
if (!fread(&palette_confirm,1,1,fp) || palette_confirm!=12)
{
pal=new palette;
pal->defaults();
}
else
{
pal=new palette;
fread(pal->addr(),1,256*3,fp);
}
fclose(fp);
return im;
}
void write_PCX(image *im, palette *pal, char *filename)
{
FILE *fp=fopen(filename,"wb");
if (!fp)
{
set_error(imWRITE_ERROR);
return ;
}
PCX_header.manufactururer=10;
PCX_header.version=5;
PCX_header.encoding=1;
PCX_header.bits_per_pixel=8;
PCX_header.xmin=0;
PCX_header.ymin=0;
PCX_header.xmax=im->width()-1;
PCX_header.ymax=im->height()-1;
PCX_header.hres=320;
PCX_header.vres=200;
PCX_header.reserved=0;
PCX_header.color_planes=1;
PCX_header.bytes_per_line=im->width();
PCX_header.palette_type=0;
memset(PCX_header.filter,0,58);
if (!write_PCX_header(fp))
{
set_error( imWRITE_ERROR);
return ;
}
int y,run_length,x;
unsigned char *sl,code;
for (y=0;y<im->height();y++)
{
sl=im->scan_line(y);
for (x=0;x<im->width();)
{
run_length=1;
while (x+run_length<im->width() && sl[x]==sl[x+run_length])
run_length++;
if (run_length==1 && sl[x]<64)
fputc(sl[x],fp);
else
{
if (run_length>=64)
run_length=63;
code=0xc0 | run_length;
fputc(code,fp);
fputc(sl[x],fp);
}
x+=run_length;
}
}
fputc(12,fp); // note that there is a palette attached
fwrite(pal->addr(),1,256*3,fp);
fclose(fp);
}
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