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/fl8mono.c $
21 * $Revision: 1.3 $
22 * $Author: kaboom $
23 * $Date: 1993/10/19 09:50:39 $
24 *
25 * Routines for drawing monochrome bitmaps into a flat 8 canvas.
26 *
27 * This file is part of the 2d library.
28 *
29 * $Log: fl8mono.c $
30 * Revision 1.3 1993/10/19 09:50:39 kaboom
31 * Replaced #include <grd.h" with new headers split from grd.h.
32 *
33 * Revision 1.2 1993/10/08 01:15:23 kaboom
34 * Changed quotes in #include liness to angle brackets for Watcom problem.
35 *
36 * Revision 1.1 1993/02/16 14:15:56 kaboom
37 * Initial revision
38 *
39 ********************************************************************
40 * Log from old flat8.c:
41 *
42 * Revision 1.5 1992/12/11 13:13:33 kaboom
43 * Fixed bug in transparent case of flat8_mono_ubitmap -- destination
44 * pointer wasn't getting incremented on transparent pixels.
45 */
46
47 #include "bit.h"
48 #include "bitmap.h"
49 #include "cnvdat.h"
50
flat8_mono_ubitmap(grs_bitmap * bm,short x,short y)51 void flat8_mono_ubitmap(grs_bitmap *bm, short x, short y) {
52 short w, h; /* working width and height */
53 int bit; /* bit from 0-7 in source byte */
54 uchar *p_row; /* pointer to current row of bitmap */
55 uchar *p_src; /* pointer to source byte */
56 uchar *p_dst;
57
58 h = bm->h;
59 p_row = bm->bits;
60 p_dst = grd_bm.bits + y * grd_bm.row + x;
61
62 if (bm->flags & BMF_TRANS) {
63 /* transparent bitmap; draw 1's as fcolor, don't draw 0's. */
64 while (h-- > 0) {
65 /* set up scanline. */
66 bit = bm->align;
67 p_src = p_row;
68 w = bm->w;
69
70 while (w-- > 0) {
71 /* do current scanline. */
72 if (*p_src & bitmask[bit])
73 *p_dst++ = grd_gc.fcolor;
74 else
75 p_dst++;
76 if (++bit > 7) {
77 bit = 0;
78 p_src++;
79 }
80 }
81 p_dst += grd_bm.row - bm->w;
82 p_row += bm->row;
83 }
84 } else {
85 /* opaque bitmap; draw 1's as fcolor, 0's as bcolor. */
86 while (h-- > 0) {
87 bit = bm->align;
88 p_src = p_row;
89 w = bm->w;
90
91 while (w-- > 0) {
92 if (*p_src & bitmask[bit])
93 *p_dst++ = grd_gc.fcolor;
94 else
95 *p_dst++ = grd_gc.bcolor;
96 if (++bit > 7) {
97 bit = 0;
98 p_src++;
99 }
100 }
101 p_dst += grd_bm.row - bm->w;
102 p_row += bm->row;
103 }
104 }
105 }
106