125 lines
4.0 KiB
C
125 lines
4.0 KiB
C
/*
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* gamma libcaca gamma test program
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* Copyright (c) 2006-2012 Sam Hocevar <sam@hocevar.net>
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* All Rights Reserved
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*
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* This program is free software. It comes without any warranty, to
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* the extent permitted by applicable law. You can redistribute it
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* and/or modify it under the terms of the Do What the Fuck You Want
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* to Public License, Version 2, as published by Sam Hocevar. See
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* http://www.wtfpl.net/ for more details.
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*/
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#include "config.h"
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#if !defined(__KERNEL__)
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# include <stdio.h>
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# include <math.h>
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#endif
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#include "caca.h"
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uint32_t buffer[256 * 4];
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int main(int argc, char *argv[])
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{
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caca_event_t ev;
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caca_canvas_t *cv, *cw, *mask;
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caca_display_t *dp;
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caca_dither_t *left, *right;
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float gam;
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int x;
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cv = caca_create_canvas(0, 0);
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if(cv == NULL)
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{
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printf("Can't created canvas\n");
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return -1;
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}
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dp = caca_create_display(cv);
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if(dp == NULL)
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{
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printf("Can't create display\n");
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return -1;
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}
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cw = caca_create_canvas(caca_get_canvas_width(cv), caca_get_canvas_height(cv));
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mask = caca_create_canvas(caca_get_canvas_width(cv), caca_get_canvas_height(cv));
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for(x = 0; x < 256; x++)
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{
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buffer[x] = (x << 16) | (x << 8) | (x<< 0);
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buffer[x + 256] = (0xff << 16) | (x << 8) | (0x00 << 0);
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buffer[x + 512] = (0x00 << 16) | (0xff << 8) | (x << 0);
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buffer[x + 768] = (x << 16) | (0x00 << 8) | (0xff << 0);
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}
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left = caca_create_dither(32, 256, 4, 4 * 256,
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0x00ff0000, 0x0000ff00, 0x000000ff, 0x0);
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right = caca_create_dither(32, 256, 4, 4 * 256,
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0x00ff0000, 0x0000ff00, 0x000000ff, 0x0);
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gam = caca_get_dither_gamma(right);
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caca_set_display_time(dp, 20000);
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for(x = 0; ; x++)
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{
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int ret = caca_get_event(dp, CACA_EVENT_KEY_PRESS, &ev, 0);
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if(ret)
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{
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if(caca_get_event_key_ch(&ev) == CACA_KEY_LEFT)
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gam /= 1.03;
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else if(caca_get_event_key_ch(&ev) == CACA_KEY_RIGHT)
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gam *= 1.03;
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else if(caca_get_event_key_ch(&ev) == CACA_KEY_DOWN)
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gam = 1.0;
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else if(caca_get_event_key_ch(&ev) == CACA_KEY_ESCAPE)
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break;
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}
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/* Resize the spare canvas, just in case the main one changed */
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caca_set_canvas_size(cw, caca_get_canvas_width(cv), caca_get_canvas_height(cv));
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caca_set_canvas_size(mask, caca_get_canvas_width(cv), caca_get_canvas_height(cv));
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/* Draw the regular dither on the main canvas */
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caca_dither_bitmap(cv, 0, 0, caca_get_canvas_width(cv),
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caca_get_canvas_height(cv), left, buffer);
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/* Draw the gamma-modified dither on the spare canvas */
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caca_set_dither_gamma(right, gam);
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caca_dither_bitmap(cw, 0, 0, caca_get_canvas_width(cw),
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caca_get_canvas_height(cw), right, buffer);
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/* Draw something on the mask */
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caca_set_color_ansi(mask, CACA_LIGHTGRAY, CACA_BLACK);
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caca_clear_canvas(mask);
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caca_set_color_ansi(mask, CACA_WHITE, CACA_WHITE);
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caca_fill_ellipse(mask, (1.0 + sin(0.05 * (float)x))
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* 0.5 * caca_get_canvas_width(mask),
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(1.0 + cos(0.05 * (float)x))
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* 0.5 * caca_get_canvas_height(mask),
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caca_get_canvas_width(mask) / 2,
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caca_get_canvas_height(mask) / 2, '#');
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/* Blit the spare canvas onto the first one */
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caca_blit(cv, 0, 0, cw, mask);
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caca_set_color_ansi(cv, CACA_WHITE, CACA_BLUE);
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caca_printf(cv, 2, 1,
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"gamma=%g - use arrows to change, Esc to quit", gam);
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caca_refresh_display(dp);
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}
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caca_free_dither(left);
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caca_free_dither(right);
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caca_free_display(dp);
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caca_free_canvas(mask);
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caca_free_canvas(cw);
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caca_free_canvas(cv);
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return 0;
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}
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