source: libcaca/trunk/examples/gamma.c @ 4148

Last change on this file since 4148 was 4148, checked in by Sam Hocevar, 10 years ago

Update my e-mail address everywhere.

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1/*
2 *  gamma         libcaca gamma test program
3 *  Copyright (c) 2006 Sam Hocevar <sam@hocevar.net>
4 *                All Rights Reserved
5 *
6 *  $Id: gamma.c 4148 2009-12-19 14:38:38Z sam $
7 *
8 *  This program is free software. It comes without any warranty, to
9 *  the extent permitted by applicable law. You can redistribute it
10 *  and/or modify it under the terms of the Do What The Fuck You Want
11 *  To Public License, Version 2, as published by Sam Hocevar. See
12 *  http://sam.zoy.org/wtfpl/COPYING for more details.
13 */
14
15#include "config.h"
16
17#if !defined(__KERNEL__)
18#   include <stdio.h>
19#   include <math.h>
20#endif
21
22#include "caca.h"
23
24uint32_t buffer[256 * 4];
25
26int main(int argc, char *argv[])
27{
28    caca_event_t ev;
29    caca_canvas_t *cv, *cw, *mask;
30    caca_display_t *dp;
31    caca_dither_t *left, *right;
32    float gam;
33    int x;
34
35    cv = caca_create_canvas(0, 0);
36    if(cv == NULL)
37    {
38        printf("Can't created canvas\n");
39        return -1;
40    }
41    dp = caca_create_display(cv);
42    if(dp == NULL)
43    {
44        printf("Can't create display\n");
45        return -1;
46    }
47
48    cw = caca_create_canvas(caca_get_canvas_width(cv), caca_get_canvas_height(cv));
49    mask = caca_create_canvas(caca_get_canvas_width(cv), caca_get_canvas_height(cv));
50
51    for(x = 0; x < 256; x++)
52    {
53        buffer[x] = (x << 16) | (x << 8) | (x<< 0);
54        buffer[x + 256] = (0xff << 16) |    (x << 8) | (0x00 << 0);
55        buffer[x + 512] = (0x00 << 16) | (0xff << 8) |    (x << 0);
56        buffer[x + 768] =    (x << 16) | (0x00 << 8) | (0xff << 0);
57    }
58
59    left = caca_create_dither(32, 256, 4, 4 * 256,
60                               0x00ff0000, 0x0000ff00, 0x000000ff, 0x0);
61    right = caca_create_dither(32, 256, 4, 4 * 256,
62                                0x00ff0000, 0x0000ff00, 0x000000ff, 0x0);
63    gam = caca_get_dither_gamma(right);
64    caca_set_display_time(dp, 20000);
65
66    for(x = 0; ; x++)
67    {
68        int ret = caca_get_event(dp, CACA_EVENT_KEY_PRESS, &ev, 0);
69
70        if(ret)
71        {
72            if(caca_get_event_key_ch(&ev) == CACA_KEY_LEFT)
73                gam /= 1.03;
74            else if(caca_get_event_key_ch(&ev) == CACA_KEY_RIGHT)
75                gam *= 1.03;
76            else if(caca_get_event_key_ch(&ev) == CACA_KEY_DOWN)
77                gam = 1.0;
78            else if(caca_get_event_key_ch(&ev) == CACA_KEY_ESCAPE)
79                break;
80        }
81
82        /* Resize the spare canvas, just in case the main one changed */
83        caca_set_canvas_size(cw, caca_get_canvas_width(cv), caca_get_canvas_height(cv));
84        caca_set_canvas_size(mask, caca_get_canvas_width(cv), caca_get_canvas_height(cv));
85
86        /* Draw the regular dither on the main canvas */
87        caca_dither_bitmap(cv, 0, 0, caca_get_canvas_width(cv),
88                            caca_get_canvas_height(cv), left, buffer);
89
90        /* Draw the gamma-modified dither on the spare canvas */
91        caca_set_dither_gamma(right, gam);
92        caca_dither_bitmap(cw, 0, 0, caca_get_canvas_width(cw),
93                            caca_get_canvas_height(cw), right, buffer);
94
95        /* Draw something on the mask */
96        caca_set_color_ansi(mask, CACA_LIGHTGRAY, CACA_BLACK);
97        caca_clear_canvas(mask);
98        caca_set_color_ansi(mask, CACA_WHITE, CACA_WHITE);
99        caca_fill_ellipse(mask, (1.0 + sin(0.05 * (float)x))
100                                   * 0.5 * caca_get_canvas_width(mask),
101                                 (1.0 + cos(0.05 * (float)x))
102                                   * 0.5 * caca_get_canvas_height(mask),
103                                 caca_get_canvas_width(mask) / 2,
104                                 caca_get_canvas_height(mask) / 2, '#');
105
106        /* Blit the spare canvas onto the first one */
107        caca_blit(cv, 0, 0, cw, mask);
108
109        caca_set_color_ansi(cv, CACA_WHITE, CACA_BLUE);
110        caca_printf(cv, 2, 1,
111                     "gamma=%g - use arrows to change, Esc to quit", gam);
112
113        caca_refresh_display(dp);
114    }
115
116    caca_free_dither(left);
117    caca_free_dither(right);
118
119    caca_free_display(dp);
120    caca_free_canvas(mask);
121    caca_free_canvas(cw);
122    caca_free_canvas(cv);
123
124    return 0;
125}
126
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