1 /*
2
3 Copyright (C) 2015-2018 Night Dive Studios, LLC.
4
5 This program is free software: you can redistribute it and/or modify
6 it under the terms of the GNU General Public License as published by
7 the Free Software Foundation, either version 3 of the License, or
8 (at your option) any later version.
9
10 This program is distributed in the hope that it will be useful,
11 but WITHOUT ANY WARRANTY; without even the implied warranty of
12 MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
13 GNU General Public License for more details.
14
15 You should have received a copy of the GNU General Public License
16 along with this program. If not, see <http://www.gnu.org/licenses/>.
17
18 */
19 /*
20 * $Source: n:/project/lib/src/2d/RCS/genfl8c.c $
21 * $Revision: 1.1 $
22 * $Author: kevin $
23 * $Date: 1994/03/15 13:15:15 $
24 *
25 * Generic flat8 clut bitmap routines.
26 *
27 * $Log: genfl8c.c $
28 * Revision 1.1 1994/03/15 13:15:15 kevin
29 * Initial revision
30 *
31 */
32
33 #include "scrdat.h"
34 #include "bitmap.h"
35 #include "clpcon.h"
36 #include "cnvdat.h"
37 #include "grcbm.h"
38 #include "grpix.h"
39
40 /* bozo flat8 bitmap drawer. */
gen_flat8_clut_ubitmap(grs_bitmap * bm,short x,short y,uchar * cl)41 void gen_flat8_clut_ubitmap (grs_bitmap *bm, short x, short y, uchar *cl)
42 {
43 uchar *src = bm->bits;
44 short right = x+bm->w;
45 short bot = y+bm->h;
46 short cur_x;
47
48 if (cl==NULL) cl=grd_screen->clut;
49 if (bm->flags & BMF_TRANS) {
50 for ( ; y<bot; y++, src+=bm->row-bm->w) {
51 for (cur_x=x ; cur_x<right; cur_x++, src++)
52 if (*src)
53 gr_set_upixel (cl[*src], cur_x, y);
54 }
55 }
56 else {
57 for ( ; y<bot; y++, src+=bm->row-bm->w) {
58 for (cur_x=x ; cur_x<right; cur_x++, src++)
59 gr_set_upixel (cl[*src], cur_x, y);
60 }
61 }
62 }
63
64 /* clip flat8 bitmap against cliprect and jump to unclipped drawer. */
gen_flat8_clut_bitmap(grs_bitmap * bm,short x,short y,uchar * cl)65 int gen_flat8_clut_bitmap (grs_bitmap *bm, short x, short y, uchar *cl)
66 {
67 short w,h;
68 uchar *p;
69 int extra;
70 int code = CLIP_NONE;
71
72 /* save stuff that clipping changes. */
73 w = bm->w; h = bm->h; p = bm->bits;
74
75 /* check for trivial reject. */
76 if (x+bm->w<grd_clip.left || x>=grd_clip.right ||
77 y+bm->h<grd_clip.top || y>=grd_clip.bot)
78 return CLIP_ALL;
79
80 /* clip & draw that sucker. */
81 if (x < grd_clip.left) { /* off left edge */
82 extra = grd_clip.left - x;
83 bm->w -= extra;
84 bm->bits += extra;
85 x = grd_clip.left;
86 code |= CLIP_LEFT;
87 }
88 if (x+bm->w > grd_clip.right) { /* off right edge */
89 bm->w -= x+bm->w-grd_clip.right;
90 code |= CLIP_RIGHT;
91 }
92 if (y < grd_clip.top) { /* off top */
93 extra = grd_clip.top - y;
94 bm->h -= extra;
95 bm->bits += bm->row*extra;
96 y = grd_clip.top;
97 code |= CLIP_TOP;
98 }
99 if (y+bm->h > grd_clip.bot) { /* off bottom */
100 bm->h -= y+bm->h-grd_clip.bot;
101 code |= CLIP_BOT;
102 }
103 gr_flat8_clut_ubitmap (bm, x, y, cl);
104
105 /* restore bitmap to normal. */
106 bm->w = w; bm->h = h; bm->bits = p;
107 return code;
108 }
109