source: libcaca/trunk/examples/gamma.c @ 4333

Last change on this file since 4333 was 4333, checked in by Sam Hocevar, 10 years ago

Large source code cleanup, getting rid of spaces, tabs, and svn keywords.

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