1 | /* |
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2 | * libcaca ASCII-Art library |
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3 | * Copyright (c) 2002-2006 Sam Hocevar <sam@zoy.org> |
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4 | * All Rights Reserved |
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5 | * |
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6 | * This library is free software; you can redistribute it and/or |
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7 | * modify it under the terms of the Do What The Fuck You Want To |
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8 | * Public License, Version 2, as published by Sam Hocevar. See |
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9 | * http://sam.zoy.org/wtfpl/COPYING for more details. |
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10 | */ |
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11 | |
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12 | /** \file graphics.c |
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13 | * \version \$Id: graphics.c 550 2006-03-08 10:33:01Z sam $ |
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14 | * \author Sam Hocevar <sam@zoy.org> |
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15 | * \brief Character drawing |
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16 | * |
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17 | * This file contains character and string drawing functions. |
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18 | */ |
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19 | |
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20 | #include "config.h" |
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21 | |
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22 | #include <stdio.h> /* BUFSIZ */ |
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23 | #include <string.h> |
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24 | #include <stdlib.h> |
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25 | #if defined(HAVE_UNISTD_H) |
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26 | # include <unistd.h> |
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27 | #endif |
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28 | #include <stdarg.h> |
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29 | |
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30 | #include "caca.h" |
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31 | #include "caca_internals.h" |
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32 | #include "cucul.h" |
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33 | #include "cucul_internals.h" |
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34 | |
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35 | /* |
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36 | * Local functions |
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37 | */ |
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38 | static void caca_handle_resize(caca_t *kk); |
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39 | |
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40 | /** \brief Set the window title. |
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41 | * |
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42 | * If libcaca runs in a window, try to change its title. This works with |
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43 | * the X11 and Win32 drivers. |
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44 | * |
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45 | * \param title The desired window title. |
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46 | * \return 0 upon success, a non-zero value if an error occurs. |
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47 | */ |
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48 | int caca_set_window_title(caca_t *kk, char const *title) |
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49 | { |
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50 | return kk->drv.set_window_title(kk, title); |
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51 | } |
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52 | |
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53 | /** \brief Get the window width. |
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54 | * |
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55 | * If libcaca runs in a window, get the usable window width. This value can |
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56 | * be used for aspect ratio calculation. If libcaca does not run in a window |
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57 | * or if there is no way to know the font size, assume a 6x10 font is being |
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58 | * used. Note that the units are not necessarily pixels. |
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59 | * |
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60 | * \return The window width. |
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61 | */ |
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62 | unsigned int caca_get_window_width(caca_t *kk) |
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63 | { |
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64 | return kk->drv.get_window_width(kk); |
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65 | } |
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66 | |
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67 | /** \brief Get the window height. |
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68 | * |
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69 | * If libcaca runs in a window, get the usable window height. This value can |
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70 | * be used for aspect ratio calculation. If libcaca does not run in a window |
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71 | * or if there is no way to know the font size, assume a 6x10 font is being |
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72 | * used. Note that the units are not necessarily pixels. |
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73 | * |
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74 | * \return The window height. |
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75 | */ |
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76 | unsigned int caca_get_window_height(caca_t *kk) |
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77 | { |
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78 | return kk->drv.get_window_height(kk); |
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79 | } |
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80 | |
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81 | /** \brief Set the refresh delay. |
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82 | * |
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83 | * This function sets the refresh delay in microseconds. The refresh delay |
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84 | * is used by caca_display() to achieve constant framerate. See the |
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85 | * caca_display() documentation for more details. |
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86 | * |
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87 | * If the argument is zero, constant framerate is disabled. This is the |
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88 | * default behaviour. |
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89 | * |
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90 | * \param usec The refresh delay in microseconds. |
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91 | */ |
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92 | void caca_set_delay(caca_t *kk, unsigned int usec) |
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93 | { |
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94 | kk->delay = usec; |
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95 | } |
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96 | |
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97 | /** \brief Get the average rendering time. |
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98 | * |
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99 | * This function returns the average rendering time, which is the average |
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100 | * measured time between two caca_display() calls, in microseconds. If |
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101 | * constant framerate was activated by calling caca_set_delay(), the average |
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102 | * rendering time will not be considerably shorter than the requested delay |
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103 | * even if the real rendering time was shorter. |
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104 | * |
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105 | * \return The render time in microseconds. |
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106 | */ |
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107 | unsigned int caca_get_rendertime(caca_t *kk) |
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108 | { |
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109 | return kk->rendertime; |
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110 | } |
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111 | |
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112 | /** \brief Flush pending changes and redraw the screen. |
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113 | * |
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114 | * This function flushes all graphical operations and prints them to the |
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115 | * screen. Nothing will show on the screen until caca_display() is |
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116 | * called. |
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117 | * |
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118 | * If caca_set_delay() was called with a non-zero value, caca_display() |
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119 | * will use that value to achieve constant framerate: if two consecutive |
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120 | * calls to caca_display() are within a time range shorter than the value |
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121 | * set with caca_set_delay(), the second call will wait a bit before |
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122 | * performing the screen refresh. |
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123 | */ |
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124 | void caca_display(caca_t *kk) |
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125 | { |
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126 | #if !defined(_DOXYGEN_SKIP_ME) |
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127 | #define IDLE_USEC 10000 |
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128 | #endif |
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129 | int ticks = kk->lastticks + _caca_getticks(&kk->timer); |
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130 | |
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131 | kk->drv.display(kk); |
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132 | |
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133 | /* FIXME handle this somewhere else */ |
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134 | if(kk->resize) |
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135 | { |
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136 | kk->resize = 0; |
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137 | caca_handle_resize(kk); |
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138 | } |
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139 | |
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140 | /* Wait until kk->delay + time of last call */ |
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141 | ticks += _caca_getticks(&kk->timer); |
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142 | for(ticks += _caca_getticks(&kk->timer); |
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143 | ticks + IDLE_USEC < (int)kk->delay; |
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144 | ticks += _caca_getticks(&kk->timer)) |
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145 | { |
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146 | _caca_sleep(IDLE_USEC); |
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147 | } |
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148 | |
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149 | /* Update the sliding mean of the render time */ |
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150 | kk->rendertime = (7 * kk->rendertime + ticks) / 8; |
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151 | |
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152 | kk->lastticks = ticks - kk->delay; |
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153 | |
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154 | /* If we drifted too much, it's bad, bad, bad. */ |
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155 | if(kk->lastticks > (int)kk->delay) |
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156 | kk->lastticks = 0; |
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157 | } |
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158 | |
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159 | /* |
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160 | * XXX: following functions are local |
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161 | */ |
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162 | |
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163 | static void caca_handle_resize(caca_t *kk) |
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164 | { |
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165 | unsigned int new_width, new_height; |
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166 | |
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167 | kk->drv.handle_resize(kk, &new_width, &new_height); |
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168 | |
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169 | /* Tell libcucul we changed size */ |
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170 | if(new_width != kk->qq->width || new_height != kk->qq->height) |
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171 | cucul_set_size(kk->qq, new_width, new_height); |
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172 | } |
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173 | |
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