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make rle_swap handle RLE_BIG

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Bradley Bell 2003-01-02 21:32:18 +00:00
parent 0b7ba05e04
commit 3b549362f5
1 changed files with 22 additions and 13 deletions
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35
2d/rle.c
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@ -1,4 +1,4 @@
/* $Id: rle.c,v 1.12 2002-12-31 21:51:37 btb Exp $ */
/* $Id: rle.c,v 1.13 2003-01-02 21:32:18 btb Exp $ */
/*
THE COMPUTER CODE CONTAINED HEREIN IS THE SOLE PROPERTY OF PARALLAX
SOFTWARE CORPORATION ("PARALLAX"). PARALLAX, IN DISTRIBUTING THE CODE TO
@ -125,7 +125,7 @@ COPYRIGHT 1993-1998 PARALLAX SOFTWARE CORPORATION. ALL RIGHTS RESERVED.
#endif
#ifdef RCS
static char rcsid[] = "$Id: rle.c,v 1.12 2002-12-31 21:51:37 btb Exp $";
static char rcsid[] = "$Id: rle.c,v 1.13 2003-01-02 21:32:18 btb Exp $";
#endif
#include <stdlib.h>
@ -1027,25 +1027,31 @@ void gr_rle_expand_scanline_svga_masked( grs_bitmap * dest, int dx, int dy, ubyt
/*
* swaps entries 0 and 255 in an RLE bitmap without uncompressing it
*
* doesn't handle RLE_BIG yet, but neither does anything else...
*
* returns the size of the new bmp->bm_data
*/
void rle_swap_0_255(grs_bitmap *bmp)
{
int i, j, len;
int i, j, len, rle_big;
unsigned char *ptr, *ptr2, *temp, *start;
unsigned short line_size;
Assert(!(bmp->bm_flags & BM_FLAG_RLE_BIG));
rle_big = bmp->bm_flags & BM_FLAG_RLE_BIG;
temp = d_malloc(4 + bmp->bm_h + (bmp->bm_w + 1) * bmp->bm_h);
ptr = bmp->bm_data + 4 + bmp->bm_h; // go to first line
ptr2 = temp + 4 + bmp->bm_h; // go to first line
if (rle_big) { // set ptrs to first lines
ptr = bmp->bm_data + 4 + 2 * bmp->bm_h;
ptr2 = temp + 4 + 2 * bmp->bm_h;
} else {
ptr = bmp->bm_data + 4 + bmp->bm_h;
ptr2 = temp + 4 + bmp->bm_h;
}
for (i = 0; i < bmp->bm_h; i++) {
start = ptr2;
for (j = 0; j < bmp->bm_data[4 + i]; j++) {
if (rle_big)
line_size = *((unsigned short *)&bmp->bm_data[4 + 2 * i]);
else
line_size = bmp->bm_data[4 + i];
for (j = 0; j < line_size; j++) {
if ((ptr[j] & RLE_CODE) != RLE_CODE) {
if (ptr[j] == 0) {
*ptr2++ = RLE_CODE | 1;
@ -1065,8 +1071,11 @@ void rle_swap_0_255(grs_bitmap *bmp)
*ptr2++ = ptr[j];
}
}
temp[4 + i] = ptr2 - start; // set line size
ptr += bmp->bm_data[4 + i]; // go to next line
if (rle_big) // set line size
*((unsigned short *)&temp[4 + 2 * i]) = ptr2 - start;
else
temp[4 + i] = ptr2 - start;
ptr += line_size; // go to next line
}
len = ptr2 - temp;
*((int *)temp) = len; // set total size