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/******************************************************************************
Plush Version 1.2
read_pcx.c
PCX Texture Reader
Copyright (c) 1996-2000, Justin Frankel
******************************************************************************/
#include "plush.h"
static pl_uInt _plHiBit(pl_uInt16);
static pl_uInt _plOptimizeImage(pl_uChar *, pl_uChar *, pl_uInt32);
static pl_sInt _plReadPCX(char *filename, pl_uInt16 *width, pl_uInt16 *height,
pl_uChar **pal, pl_uChar **data);
static void _plRescaleImage(pl_uChar *in, pl_uChar *out, pl_uInt inx,
pl_uInt iny, pl_uInt outx, pl_uInt outy);
pl_Texture *plReadPCXTex(char *fn, pl_Bool rescale, pl_Bool optimize) {
pl_uChar *data, *pal;
pl_uInt16 x, y;
pl_Texture *t;
if (_plReadPCX(fn,&x,&y,&pal,&data) < 0) return 0;
t = (pl_Texture *) malloc(sizeof(pl_Texture));
if (!t) return 0;
t->Width = _plHiBit(x);
t->Height = _plHiBit(y);
if (rescale && (1 << t->Width != x || 1 << t->Height != y)) {
pl_uChar nx, ny, *newdata;
nx = t->Width;
if ((1 << t->Width) != x) nx++;
ny = t->Height;
if ((1 << t->Height) != y) ny++;
newdata = (pl_uChar *) malloc((1<<nx)*(1<<ny));
if (!newdata) {
free(t);
free(data);
free(pal);
return 0;
}
_plRescaleImage(data,newdata,x,y,1<<nx,1<<ny);
free(data);
data = newdata;
t->Width = nx;
t->Height = ny;
x = 1<<nx; y = 1<<ny;
}
t->iWidth = x;
t->iHeight = y;
t->uScale = (pl_Float) (1<<t->Width);
t->vScale = (pl_Float) (1<<t->Height);
if (optimize) t->NumColors = _plOptimizeImage(pal, data,x*y);
else t->NumColors = 256;
t->Data = data;
t->PaletteData = pal;
return t;
}
static pl_uInt _plHiBit(pl_uInt16 x) {
pl_uInt i = 16, mask = 1<<15;
while (mask) {
if (x & mask) return i;
mask >>= 1; i--;
}
return 0;
}
static pl_uInt _plOptimizeImage(pl_uChar *pal, pl_uChar *data, pl_uInt32 len) {
pl_uChar colors[256], *dd = data;
pl_uChar remap[256];
pl_sInt32 lastused, firstunused;
pl_uInt32 x;
memset(colors,0,256);
for (x = 0; x < len; x ++) colors[(pl_uInt) *dd++] = 1;
lastused = -1;
for (x = 0; x < 256; x ++) remap[x] = (pl_uChar)x;
lastused = 255;
firstunused = 0;
for (;;) {
while (firstunused < 256 && colors[firstunused]) firstunused++;
if (firstunused > 255) break;
while (lastused >= 0 && !colors[lastused]) lastused--;
if (lastused < 0) break;
if (lastused <= firstunused) break;
pal[firstunused*3] = pal[lastused*3];
pal[firstunused*3+1] = pal[lastused*3+1];
pal[firstunused*3+2] = pal[lastused*3+2];
colors[lastused] = 0;
colors[firstunused] = 1;
remap[lastused] = (pl_uChar) firstunused;
}
x = len;
while (x--) *data++ = remap[(pl_uInt) *data];
return (lastused+1);
}
static pl_sInt _plReadPCX(char *filename, pl_uInt16 *width, pl_uInt16 *height,
pl_uChar **pal, pl_uChar **data) {
pl_uInt16 sx, sy, ex, ey;
FILE *fp = fopen(filename,"rb");
pl_uChar *data2;
if (!fp) return -1;
fgetc(fp);
if (fgetc(fp) != 5) { fclose(fp); return -2; }
if (fgetc(fp) != 1) { fclose(fp); return -2; }
if (fgetc(fp) != 8) { fclose(fp); return -3; }
sx = fgetc(fp); sx |= fgetc(fp)<<8;
sy = fgetc(fp); sy |= fgetc(fp)<<8;
ex = fgetc(fp); ex |= fgetc(fp)<<8;
ey = fgetc(fp); ey |= fgetc(fp)<<8;
*width = ex - sx + 1;
*height = ey - sy + 1;
fseek(fp,128,SEEK_SET);
if (feof(fp)) { fclose(fp); return -4; }
*data = (pl_uChar *) malloc((*width) * (*height));
if (!*data) { fclose(fp); return -128; }
sx = *height;
data2 = *data;
do {
int xpos = 0;
do {
char c = fgetc(fp);
if ((c & 192) == 192) {
char oc = fgetc(fp);
c &= ~192;
do {
*(data2++) = oc;
xpos++;
} while (--c && xpos < *width);
} else {
*(data2++) = c;
xpos++;
}
} while (xpos < *width);
} while (--sx);
if (feof(fp)) { fclose(fp); free(*data); return -5; }
fseek(fp,-769,SEEK_END);
if (fgetc(fp) != 12) { fclose(fp); free(*data); return -6; }
*pal = (pl_uChar *) malloc(768);
if (!*pal) { fclose(fp); free(*data); return -7; }
fread(*pal,3,256,fp);
fclose(fp);
return 0;
}
static void _plRescaleImage(pl_uChar *in, pl_uChar *out, pl_uInt inx,
pl_uInt iny, pl_uInt outx, pl_uInt outy) {
pl_uInt x;
pl_uInt32 X, dX, dY, Y;
dX = (inx<<16) / outx;
dY = (iny<<16) / outy;
Y = 0;
do {
pl_uChar *ptr = in + inx*(Y>>16);
X = 0;
Y += dY;
x = outx;
do {
*out++ = ptr[X>>16];
X += dX;
} while (--x);
} while (--outy);
}
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