source: ttyvaders/trunk/libcaca/blit.c @ 188

Last change on this file since 188 was 188, checked in by Sam Hocevar, 17 years ago
  • configure.ac: + Added -Wsign-compare to the warning flags.
  • libcaca/caca.c: + Fixed a signed/unsigned bug that caused infinite waits with

ee_set_delay(0).

  • src/weapons.c libcaca/graphics.c libcaca/blit.c libcaca/conic.c: + Fixed minor signed/unsigned comparison warnings.
  • Property svn:keywords set to Id
File size: 3.1 KB
Line 
1/*
2 *   libcaca       ASCII-Art library
3 *   Copyright (c) 2002, 2003 Sam Hocevar <sam@zoy.org>
4 *                 All Rights Reserved
5 *
6 *   $Id: blit.c 188 2003-11-16 11:26:54Z sam $
7 *
8 *   This program is free software; you can redistribute it and/or modify
9 *   it under the terms of the GNU General Public License as published by
10 *   the Free Software Foundation; either version 2 of the License, or
11 *   (at your option) any later version.
12 *
13 *   This program is distributed in the hope that it will be useful,
14 *   but WITHOUT ANY WARRANTY; without even the implied warranty of
15 *   MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
16 *   GNU General Public License for more details.
17 *
18 *   You should have received a copy of the GNU General Public License
19 *   along with this program; if not, write to the Free Software
20 *   Foundation, Inc., 675 Mass Ave, Cambridge, MA 02139, USA.
21 */
22
23#include "config.h"
24
25#ifdef HAVE_INTTYPES_H
26#   include <inttypes.h>
27#else
28typedef unsigned char uint8_t;
29#endif
30
31#include <stdlib.h>
32
33#include "caca.h"
34#include "caca_internals.h"
35
36#include <stdio.h>
37void caca_blit(int x1, int y1, int x2, int y2, void *pixels, int w, int h)
38{
39    char foo[] = { ' ', '.', ':', ';', '=', '$', '%', '@', '#', '8', 'W' };
40    int x, y, pitch;
41
42    if(x1 > x2)
43    {
44        int tmp = x2; x2 = x1; x1 = tmp;
45    }
46
47    if(y1 > y2)
48    {
49        int tmp = y2; y2 = y1; y1 = tmp;
50    }
51
52    pitch = (3 * w + 3) / 4 * 4;
53
54    for(y = y1 > 0 ? y1 : 0; y <= y2 && y <= (int)caca_get_height(); y++)
55        for(x = x1 > 0 ? x1 : 0; x <= x2 && x <= (int)caca_get_width(); x++)
56        {
57            int fromx = w * (x - x1) / (x2 - x1 + 1);
58            int fromy = h * (y - y1) / (y2 - y1 + 1);
59            int r = ((unsigned char *)pixels)[3 * fromx + pitch * fromy];
60            int g = ((unsigned char *)pixels)[3 * fromx + 1 + pitch * fromy];
61            int b = ((unsigned char *)pixels)[3 * fromx + 2 + pitch * fromy];
62
63            if(r == g && g == b)
64            {
65                caca_set_color(EE_LIGHTGRAY);
66            }
67            else
68            {
69                static int foo_colors[6] = {EE_LIGHTRED, EE_YELLOW, EE_LIGHTGREEN, EE_LIGHTCYAN, EE_LIGHTBLUE, EE_LIGHTMAGENTA};
70                float min = r, max = r, delta, hue, sat;
71                if(min > g) min = g; if(max < g) max = g;
72                if(min > b) min = b; if(max < b) max = b;
73
74                delta = max - min;
75
76                sat = max / delta;
77
78                if(delta > 20)
79                {
80                    if( r == max )
81                        hue = (g - b) / delta; // between yellow & magenta
82                    else if( g == max )
83                        hue = 2 + (b - r) / delta; // between cyan & yellow
84                    else
85                        hue = 4 + (r - g) / delta; // between magenta & cyan
86
87                    hue *= 60; // degrees
88                    if( hue < 0 )
89                        hue += 360;
90
91                    caca_set_color(foo_colors[(int)(hue + 30) / 60]);
92                }
93                else
94                {
95                    caca_set_color(EE_LIGHTGRAY);
96                }
97            }
98
99            caca_putchar(x, y, foo[(r + g + b) / 3 / 25]);
100        }
101}
102
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