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gamma.c 4.1 KiB

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  1. /*
  2. * gamma libcucul gamma test program
  3. * Copyright (c) 2006 Sam Hocevar <sam@zoy.org>
  4. * All Rights Reserved
  5. *
  6. * $Id$
  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. #include "config.h"
  15. #if !defined(__KERNEL__)
  16. # include <stdio.h>
  17. # include <math.h>
  18. #endif
  19. #include "cucul.h"
  20. #include "caca.h"
  21. uint32_t buffer[256 * 4];
  22. int main(int argc, char *argv[])
  23. {
  24. caca_event_t ev;
  25. cucul_canvas_t *cv, *cw, *mask;
  26. caca_display_t *dp;
  27. cucul_dither_t *left, *right;
  28. float gam;
  29. int x;
  30. cv = cucul_create_canvas(0, 0);
  31. if(cv == NULL)
  32. {
  33. printf("Can't created canvas\n");
  34. return -1;
  35. }
  36. dp = caca_create_display(cv);
  37. if(dp == NULL)
  38. {
  39. printf("Can't create display\n");
  40. return -1;
  41. }
  42. cw = cucul_create_canvas(cucul_get_canvas_width(cv), cucul_get_canvas_height(cv));
  43. mask = cucul_create_canvas(cucul_get_canvas_width(cv), cucul_get_canvas_height(cv));
  44. for(x = 0; x < 256; x++)
  45. {
  46. buffer[x] = (x << 16) | (x << 8) | (x<< 0);
  47. buffer[x + 256] = (0xff << 16) | (x << 8) | (0x00 << 0);
  48. buffer[x + 512] = (0x00 << 16) | (0xff << 8) | (x << 0);
  49. buffer[x + 768] = (x << 16) | (0x00 << 8) | (0xff << 0);
  50. }
  51. left = cucul_create_dither(32, 256, 4, 4 * 256,
  52. 0x00ff0000, 0x0000ff00, 0x000000ff, 0x0);
  53. right = cucul_create_dither(32, 256, 4, 4 * 256,
  54. 0x00ff0000, 0x0000ff00, 0x000000ff, 0x0);
  55. gam = cucul_get_dither_gamma(right);
  56. caca_set_display_time(dp, 20000);
  57. for(x = 0; ; x++)
  58. {
  59. int ret = caca_get_event(dp, CACA_EVENT_KEY_PRESS, &ev, 0);
  60. if(ret)
  61. {
  62. if(caca_get_event_key_ch(&ev) == CACA_KEY_LEFT)
  63. gam /= 1.03;
  64. else if(caca_get_event_key_ch(&ev) == CACA_KEY_RIGHT)
  65. gam *= 1.03;
  66. else if(caca_get_event_key_ch(&ev) == CACA_KEY_DOWN)
  67. gam = 1.0;
  68. else if(caca_get_event_key_ch(&ev) == CACA_KEY_ESCAPE)
  69. break;
  70. }
  71. /* Resize the spare canvas, just in case the main one changed */
  72. cucul_set_canvas_size(cw, cucul_get_canvas_width(cv), cucul_get_canvas_height(cv));
  73. cucul_set_canvas_size(mask, cucul_get_canvas_width(cv), cucul_get_canvas_height(cv));
  74. /* Draw the regular dither on the main canvas */
  75. cucul_dither_bitmap(cv, 0, 0, cucul_get_canvas_width(cv),
  76. cucul_get_canvas_height(cv), left, buffer);
  77. /* Draw the gamma-modified dither on the spare canvas */
  78. cucul_set_dither_gamma(right, gam);
  79. cucul_dither_bitmap(cw, 0, 0, cucul_get_canvas_width(cw),
  80. cucul_get_canvas_height(cw), right, buffer);
  81. /* Draw something on the mask */
  82. cucul_set_color_ansi(mask, CUCUL_LIGHTGRAY, CUCUL_BLACK);
  83. cucul_clear_canvas(mask);
  84. cucul_set_color_ansi(mask, CUCUL_WHITE, CUCUL_WHITE);
  85. cucul_fill_ellipse(mask, (1.0 + sin(0.05 * (float)x))
  86. * 0.5 * cucul_get_canvas_width(mask),
  87. (1.0 + cos(0.05 * (float)x))
  88. * 0.5 * cucul_get_canvas_height(mask),
  89. cucul_get_canvas_width(mask) / 2,
  90. cucul_get_canvas_height(mask) / 2, '#');
  91. /* Blit the spare canvas onto the first one */
  92. cucul_blit(cv, 0, 0, cw, mask);
  93. cucul_set_color_ansi(cv, CUCUL_WHITE, CUCUL_BLUE);
  94. cucul_printf(cv, 2, 1,
  95. "gamma=%g - use arrows to change, Esc to quit", gam);
  96. caca_refresh_display(dp);
  97. }
  98. cucul_free_dither(left);
  99. cucul_free_dither(right);
  100. caca_free_display(dp);
  101. cucul_free_canvas(mask);
  102. cucul_free_canvas(cw);
  103. cucul_free_canvas(cv);
  104. return 0;
  105. }