source: libcaca/trunk/examples/gamma.c @ 2821

Last change on this file since 2821 was 2821, checked in by Sam Hocevar, 11 years ago

Starting refactoring to get rid of libcucul. The initial reason for the
split is rendered moot by the plugin system: when enabled, binaries do
not link directly with libX11 or libGL. I hope this is a step towards
more consisteny and clarity.

  • Property svn:keywords set to Id
File size: 4.0 KB
Line 
1/*
2 *  gamma         libcaca gamma test program
3 *  Copyright (c) 2006 Sam Hocevar <sam@zoy.org>
4 *                All Rights Reserved
5 *
6 *  $Id: gamma.c 2821 2008-09-27 13:12:46Z 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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