123 lines
2.4 KiB
C
123 lines
2.4 KiB
C
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#include <string.h>
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#include <stdlib.h>
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#include <stdio.h>
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#include <process.h>
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#include <dos.h>
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#include <alloc.h>
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#include "sgrab.h"
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#pragma hdrstop
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#define TRANSCOLOR 0
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typedef struct
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{
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short leftoffset; // source pixels to the left of midpoint
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short width; // last row used - first row + 1
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short collumnofs[256]; // only [width] used, [0] is &collumnofs[width]
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// 0 collumnofs means empty row
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// the data is : top, bottom, pixels...
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} dsprite_t;
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/*
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==============
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=
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= GrabDSprite
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=
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= filename dsprite x y width height
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=
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==============
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*/
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void GrabDSprite (void)
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{
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int x,y,xl,yl,w,h;
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byte far *screen_p;
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int linedelta;
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dsprite_t far *header;
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int first,last;
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GetToken (false);
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xl = atoi (token);
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GetToken (false);
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yl = atoi (token);
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GetToken (false);
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w = atoi (token);
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GetToken (false);
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h = atoi (token);
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//
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// find first and last collumn
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//
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screen_p = MK_FP(0xa000,yl*SCREENWIDTH+xl);
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for (first=0 ; first<w ; first++)
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{
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for (y=0 ; y<h ; y++)
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if ( *(screen_p+y*SCREENWIDTH) != TRANSCOLOR )
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goto gotfirst;
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screen_p++;
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}
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MS_Quit ("GrabDSprite: Nothing in block");
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gotfirst:
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screen_p = MK_FP(0xa000,yl*SCREENWIDTH+xl+w-1);
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for (last=w-1 ; last>=0 ; last--)
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{
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for (y=0 ; y<h ; y++)
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if ( *(screen_p+y*SCREENWIDTH) != TRANSCOLOR )
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goto gotlast;
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screen_p--;
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}
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gotlast:
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w = last - first + 1;
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header = (dsprite_t far *)lump_p;
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header->leftoffset = w/2 - first;
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header->width = w;
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//
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// start grabbing rows
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//
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lump_p = (byte far *)&header->collumnofs[header->width];
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screen_p = MK_FP(0xa000,yl*SCREENWIDTH+xl+first);
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for (x=0 ; x< w ; x++,screen_p++)
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{
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// find first good pixel
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for (first=0 ; first<h ; first++)
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{
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if ( *(screen_p+first*SCREENWIDTH) != TRANSCOLOR )
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break;
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*(screen_p+first*SCREENWIDTH) ^= 0xff;
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}
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if (first==h)
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{
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header->collumnofs[x] = 0; // nothing in this collumn
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continue;
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}
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// find last good pixel
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for (last=h-1 ; last>=0 ; last--)
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{
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if ( *(screen_p+last*SCREENWIDTH) != TRANSCOLOR )
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break;
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*(screen_p+last*SCREENWIDTH) ^= 0xff;
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}
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// grab that segment
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header->collumnofs[x] = lump_p - (byte far *)header;
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*lump_p++ = h - 1 - first;
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*lump_p++ = h - 1 - last;
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for (y=first ; y<=last ; y++)
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{
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*lump_p++ = *(screen_p+y*SCREENWIDTH);
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*(screen_p+y*SCREENWIDTH) = 0xff;
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}
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}
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}
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