1 | /* |
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2 | * libcaca Colour ASCII-Art library |
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3 | * Copyright (c) 2002-2009 Sam Hocevar <sam@hocevar.net> |
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4 | * All Rights Reserved |
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5 | * |
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6 | * $Id: string.c 3583 2009-07-26 19:17:35Z sam $ |
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7 | * |
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8 | * This library is free software. It comes without any warranty, to |
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9 | * the extent permitted by applicable law. You can redistribute it |
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10 | * and/or modify it under the terms of the Do What The Fuck You Want |
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11 | * To Public License, Version 2, as published by Sam Hocevar. See |
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12 | * http://sam.zoy.org/wtfpl/COPYING for more details. |
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13 | */ |
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14 | |
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15 | /* |
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16 | * This file contains various canvas handling functions such as character |
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17 | * and string drawing. |
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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 | #if !defined(__KERNEL__) |
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23 | # include <stdio.h> /* BUFSIZ */ |
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24 | # include <string.h> |
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25 | # include <stdlib.h> |
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26 | # include <stdarg.h> |
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27 | # if defined(HAVE_UNISTD_H) |
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28 | # include <unistd.h> |
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29 | # endif |
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30 | # if defined(HAVE_SIGNAL_H) |
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31 | # include <signal.h> |
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32 | # endif |
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33 | # if defined(HAVE_SYS_IOCTL_H) |
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34 | # include <sys/ioctl.h> |
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35 | # endif |
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36 | #endif |
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37 | |
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38 | #include "caca.h" |
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39 | #include "caca_internals.h" |
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40 | |
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41 | /** \brief Set cursor position. |
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42 | * |
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43 | * Put the cursor at the given coordinates. Functions making use of the |
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44 | * cursor will use the new values. Setting the cursor position outside the |
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45 | * canvas is legal but the cursor will not be shown. |
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46 | * |
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47 | * This function never fails. |
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48 | * |
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49 | * \param cv A handle to the libcaca canvas. |
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50 | * \param x X cursor coordinate. |
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51 | * \param y Y cursor coordinate. |
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52 | * \return This function always returns 0. |
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53 | */ |
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54 | int caca_gotoxy(caca_canvas_t *cv, int x, int y) |
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55 | { |
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56 | cv->frames[cv->frame].x = x; |
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57 | cv->frames[cv->frame].y = y; |
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58 | |
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59 | return 0; |
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60 | } |
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61 | |
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62 | /** \brief Get X cursor position. |
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63 | * |
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64 | * Retrieve the X coordinate of the cursor's position. |
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65 | * |
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66 | * This function never fails. |
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67 | * |
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68 | * \param cv A handle to the libcaca canvas. |
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69 | * \return The cursor's X coordinate. |
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70 | */ |
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71 | int caca_get_cursor_x(caca_canvas_t const *cv) |
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72 | { |
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73 | return cv->frames[cv->frame].x; |
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74 | } |
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75 | |
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76 | /** \brief Get Y cursor position. |
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77 | * |
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78 | * Retrieve the Y coordinate of the cursor's position. |
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79 | * |
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80 | * This function never fails. |
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81 | * |
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82 | * \param cv A handle to the libcaca canvas. |
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83 | * \return The cursor's Y coordinate. |
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84 | */ |
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85 | int caca_get_cursor_y(caca_canvas_t const *cv) |
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86 | { |
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87 | return cv->frames[cv->frame].y; |
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88 | } |
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89 | |
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90 | /** \brief Print an ASCII or Unicode character. |
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91 | * |
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92 | * Print an ASCII or Unicode character at the given coordinates, using |
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93 | * the default foreground and background colour values. |
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94 | * |
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95 | * If the coordinates are outside the canvas boundaries, nothing is printed. |
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96 | * If a fullwidth Unicode character gets overwritten, its remaining visible |
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97 | * parts are replaced with spaces. If the canvas' boundaries would split the |
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98 | * fullwidth character in two, a space is printed instead. |
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99 | * |
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100 | * The behaviour when printing non-printable characters or invalid UTF-32 |
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101 | * characters is undefined. To print a sequence of bytes forming an UTF-8 |
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102 | * character instead of an UTF-32 character, use the caca_put_str() function. |
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103 | * |
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104 | * This function never fails. |
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105 | * |
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106 | * \param cv A handle to the libcaca canvas. |
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107 | * \param x X coordinate. |
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108 | * \param y Y coordinate. |
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109 | * \param ch The character to print. |
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110 | * \return This function always returns 0. |
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111 | */ |
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112 | int caca_put_char(caca_canvas_t *cv, int x, int y, uint32_t ch) |
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113 | { |
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114 | uint32_t *curchar, *curattr, attr; |
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115 | int fullwidth, xmin, xmax; |
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116 | |
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117 | if(x >= (int)cv->width || y < 0 || y >= (int)cv->height) |
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118 | return 0; |
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119 | |
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120 | if(ch == CACA_MAGIC_FULLWIDTH) |
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121 | return 0; |
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122 | |
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123 | fullwidth = caca_utf32_is_fullwidth(ch); |
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124 | |
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125 | if(x == -1 && fullwidth) |
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126 | { |
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127 | x = 0; |
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128 | ch = ' '; |
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129 | fullwidth = 0; |
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130 | } |
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131 | else if(x < 0) |
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132 | return 0; |
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133 | |
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134 | curchar = cv->chars + x + y * cv->width; |
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135 | curattr = cv->attrs + x + y * cv->width; |
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136 | attr = cv->curattr; |
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137 | |
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138 | xmin = xmax = x; |
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139 | |
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140 | /* When overwriting the right part of a fullwidth character, |
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141 | * replace its left part with a space. */ |
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142 | if(x && curchar[0] == CACA_MAGIC_FULLWIDTH) |
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143 | { |
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144 | curchar[-1] = ' '; |
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145 | xmin--; |
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146 | } |
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147 | |
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148 | if(fullwidth) |
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149 | { |
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150 | if(x + 1 == (int)cv->width) |
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151 | ch = ' '; |
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152 | else |
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153 | { |
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154 | xmax++; |
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155 | |
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156 | /* When overwriting the left part of a fullwidth character, |
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157 | * replace its right part with a space. */ |
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158 | if(x + 2 < (int)cv->width && curchar[2] == CACA_MAGIC_FULLWIDTH) |
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159 | { |
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160 | curchar[2] = ' '; |
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161 | xmax++; |
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162 | } |
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163 | |
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164 | curchar[1] = CACA_MAGIC_FULLWIDTH; |
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165 | curattr[1] = attr; |
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166 | } |
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167 | } |
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168 | else |
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169 | { |
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170 | /* When overwriting the left part of a fullwidth character, |
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171 | * replace its right part with a space. */ |
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172 | if(x + 1 != (int)cv->width && curchar[1] == CACA_MAGIC_FULLWIDTH) |
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173 | { |
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174 | curchar[1] = ' '; |
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175 | xmax++; |
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176 | } |
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177 | } |
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178 | |
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179 | /* Only add a dirty rectangle if we are pasting a different character |
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180 | * or attribute at that place. This does not account for inconsistencies |
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181 | * in the canvas, ie. if CACA_MAGIC_FULLWIDTH lies at illegal places, |
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182 | * but it's the caller's responsibility not to corrupt the contents. */ |
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183 | if(!cv->dirty_disabled |
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184 | && (curchar[0] != ch || curattr[0] != attr)) |
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185 | caca_add_dirty_rect(cv, xmin, y, xmax - xmin + 1, 1); |
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186 | |
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187 | curchar[0] = ch; |
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188 | curattr[0] = attr; |
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189 | |
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190 | return 0; |
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191 | } |
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192 | |
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193 | /** \brief Get the Unicode character at the given coordinates. |
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194 | * |
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195 | * Get the ASCII or Unicode value of the character at the given |
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196 | * coordinates. If the value is less or equal to 127 (0x7f), |
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197 | * the character can be printed as ASCII. Otherise, it must be handled |
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198 | * as a UTF-32 value. |
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199 | * |
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200 | * If the coordinates are outside the canvas boundaries, a space (0x20) |
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201 | * is returned. |
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202 | * |
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203 | * A special exception is when CACA_MAGIC_FULLWIDTH is returned. This |
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204 | * value is guaranteed not to be a valid Unicode character, and indicates |
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205 | * that the character at the left of the requested one is a fullwidth |
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206 | * character. |
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207 | * |
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208 | * This function never fails. |
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209 | * |
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210 | * \param cv A handle to the libcaca canvas. |
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211 | * \param x X coordinate. |
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212 | * \param y Y coordinate. |
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213 | * \return The Unicode character at the given coordinates. |
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214 | */ |
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215 | uint32_t caca_get_char(caca_canvas_t const *cv, int x, int y) |
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216 | { |
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217 | if(x < 0 || x >= (int)cv->width || y < 0 || y >= (int)cv->height) |
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218 | return ' '; |
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219 | |
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220 | return cv->chars[x + y * cv->width]; |
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221 | } |
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222 | |
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223 | /** \brief Print a string. |
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224 | * |
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225 | * Print an UTF-8 string at the given coordinates, using the default |
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226 | * foreground and background values. The coordinates may be outside the |
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227 | * canvas boundaries (eg. a negative Y coordinate) and the string will |
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228 | * be cropped accordingly if it is too long. |
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229 | * |
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230 | * See caca_put_char() for more information on how fullwidth characters |
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231 | * are handled when overwriting each other or at the canvas' boundaries. |
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232 | * |
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233 | * This function never fails. |
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234 | * |
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235 | * \param cv A handle to the libcaca canvas. |
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236 | * \param x X coordinate. |
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237 | * \param y Y coordinate. |
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238 | * \param s The string to print. |
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239 | * \return This function always returns 0. |
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240 | */ |
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241 | int caca_put_str(caca_canvas_t *cv, int x, int y, char const *s) |
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242 | { |
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243 | size_t rd; |
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244 | |
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245 | if(y < 0 || y >= (int)cv->height || x >= (int)cv->width) |
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246 | return 0; |
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247 | |
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248 | while(*s && x < -1) |
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249 | { |
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250 | x += caca_utf32_is_fullwidth(caca_utf8_to_utf32(s, &rd)) ? 2 : 1; |
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251 | s += rd; |
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252 | } |
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253 | |
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254 | while(*s && x < (int)cv->width) |
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255 | { |
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256 | uint32_t ch = caca_utf8_to_utf32(s, &rd); |
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257 | caca_put_char(cv, x, y, ch); |
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258 | x += caca_utf32_is_fullwidth(ch) ? 2 : 1; |
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259 | s += rd; |
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260 | } |
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261 | |
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262 | return 0; |
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263 | } |
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264 | |
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265 | /** \brief Print a formated string. |
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266 | * |
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267 | * Format a string at the given coordinates, using the default foreground |
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268 | * and background values. The coordinates may be outside the canvas |
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269 | * boundaries (eg. a negative Y coordinate) and the string will be cropped |
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270 | * accordingly if it is too long. The syntax of the format string is the |
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271 | * same as for the C printf() function. |
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272 | * |
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273 | * This function never fails. |
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274 | * |
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275 | * \param cv A handle to the libcaca canvas. |
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276 | * \param x X coordinate. |
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277 | * \param y Y coordinate. |
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278 | * \param format The format string to print. |
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279 | * \param ... Arguments to the format string. |
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280 | * \return This function always returns 0. |
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281 | */ |
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282 | int caca_printf(caca_canvas_t *cv, int x, int y, char const *format, ...) |
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283 | { |
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284 | char tmp[BUFSIZ]; |
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285 | char *buf = tmp; |
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286 | va_list args; |
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287 | |
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288 | if(y < 0 || y >= (int)cv->height || x >= (int)cv->width) |
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289 | return 0; |
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290 | |
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291 | if(cv->width - x + 1 > BUFSIZ) |
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292 | buf = malloc(cv->width - x + 1); |
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293 | |
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294 | va_start(args, format); |
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295 | #if defined(HAVE_VSNPRINTF) |
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296 | vsnprintf(buf, cv->width - x + 1, format, args); |
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297 | #else |
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298 | vsprintf(buf, format, args); |
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299 | #endif |
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300 | buf[cv->width - x] = '\0'; |
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301 | va_end(args); |
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302 | |
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303 | caca_put_str(cv, x, y, buf); |
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304 | |
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305 | if(buf != tmp) |
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306 | free(buf); |
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307 | |
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308 | return 0; |
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309 | } |
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310 | |
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311 | /** \brief Clear the canvas. |
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312 | * |
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313 | * Clear the canvas using the current foreground and background colours. |
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314 | * |
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315 | * This function never fails. |
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316 | * |
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317 | * \param cv The canvas to clear. |
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318 | * \return This function always returns 0. |
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319 | */ |
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320 | int caca_clear_canvas(caca_canvas_t *cv) |
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321 | { |
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322 | uint32_t attr = cv->curattr; |
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323 | int n; |
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324 | |
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325 | for(n = cv->width * cv->height; n--; ) |
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326 | { |
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327 | cv->chars[n] = (uint32_t)' '; |
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328 | cv->attrs[n] = attr; |
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329 | } |
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330 | |
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331 | if(!cv->dirty_disabled) |
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332 | caca_add_dirty_rect(cv, 0, 0, cv->width, cv->height); |
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333 | |
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334 | return 0; |
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335 | } |
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336 | |
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337 | /** \brief Set cursor handle. |
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338 | * |
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339 | * Set the canvas' handle. Blitting functions will use the handle value |
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340 | * to put the canvas at the proper coordinates. |
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341 | * |
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342 | * This function never fails. |
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343 | * |
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344 | * \param cv A handle to the libcaca canvas. |
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345 | * \param x X handle coordinate. |
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346 | * \param y Y handle coordinate. |
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347 | * \return This function always returns 0. |
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348 | */ |
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349 | int caca_set_canvas_handle(caca_canvas_t *cv, int x, int y) |
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350 | { |
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351 | cv->frames[cv->frame].handlex = x; |
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352 | cv->frames[cv->frame].handley = y; |
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353 | |
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354 | return 0; |
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355 | } |
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356 | |
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357 | /** \brief Get X handle position. |
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358 | * |
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359 | * Retrieve the X coordinate of the canvas' handle. |
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360 | * |
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361 | * This function never fails. |
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362 | * |
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363 | * \param cv A handle to the libcaca canvas. |
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364 | * \return The canvas' handle's X coordinate. |
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365 | */ |
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366 | int caca_get_canvas_handle_x(caca_canvas_t const *cv) |
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367 | { |
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368 | return cv->frames[cv->frame].handlex; |
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369 | } |
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370 | |
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371 | /** \brief Get Y handle position. |
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372 | * |
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373 | * Retrieve the Y coordinate of the canvas' handle. |
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374 | * |
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375 | * This function never fails. |
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376 | * |
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377 | * \param cv A handle to the libcaca canvas. |
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378 | * \return The canvas' handle's Y coordinate. |
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379 | */ |
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380 | int caca_get_canvas_handle_y(caca_canvas_t const *cv) |
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381 | { |
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382 | return cv->frames[cv->frame].handley; |
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383 | } |
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384 | |
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385 | /** \brief Blit a canvas onto another one. |
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386 | * |
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387 | * Blit a canvas onto another one at the given coordinates. |
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388 | * An optional mask canvas can be used. |
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389 | * |
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390 | * If an error occurs, -1 is returned and \b errno is set accordingly: |
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391 | * - \c EINVAL A mask was specified but the mask size and source canvas |
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392 | * size do not match. |
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393 | * |
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394 | * \param dst The destination canvas. |
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395 | * \param x X coordinate. |
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396 | * \param y Y coordinate. |
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397 | * \param src The source canvas. |
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398 | * \param mask The mask canvas. |
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399 | * \return 0 in case of success, -1 if an error occurred. |
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400 | */ |
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401 | int caca_blit(caca_canvas_t *dst, int x, int y, |
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402 | caca_canvas_t const *src, caca_canvas_t const *mask) |
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403 | { |
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404 | int i, j, starti, startj, endi, endj, stride, bleed_left, bleed_right; |
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405 | |
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406 | if(mask && (src->width != mask->width || src->height != mask->height)) |
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407 | { |
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408 | seterrno(EINVAL); |
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409 | return -1; |
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410 | } |
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411 | |
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412 | x -= src->frames[src->frame].handlex; |
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413 | y -= src->frames[src->frame].handley; |
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414 | |
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415 | starti = x < 0 ? -x : 0; |
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416 | startj = y < 0 ? -y : 0; |
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417 | endi = (x + src->width >= dst->width) ? dst->width - x : src->width; |
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418 | endj = (y + src->height >= dst->height) ? dst->height - y : src->height; |
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419 | stride = endi - starti; |
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420 | |
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421 | if(starti > src->width || startj > src->height |
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422 | || starti >= endi || startj >= endj) |
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423 | return 0; |
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424 | |
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425 | bleed_left = bleed_right = 0; |
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426 | |
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427 | for(j = startj; j < endj; j++) |
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428 | { |
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429 | int dstix = (j + y) * dst->width + starti + x; |
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430 | int srcix = j * src->width + starti; |
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431 | |
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432 | /* FIXME: we are ignoring the mask here */ |
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433 | if((starti + x) && dst->chars[dstix] == CACA_MAGIC_FULLWIDTH) |
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434 | { |
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435 | dst->chars[dstix - 1] = ' '; |
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436 | bleed_left = 1; |
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437 | } |
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438 | |
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439 | if(endi + x < dst->width |
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440 | && dst->chars[dstix + stride] == CACA_MAGIC_FULLWIDTH) |
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441 | { |
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442 | dst->chars[dstix + stride] = ' '; |
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443 | bleed_right = 1; |
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444 | } |
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445 | |
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446 | if(mask) |
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447 | { |
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448 | for(i = 0; i < stride; i++) |
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449 | { |
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450 | if(mask->chars[srcix + i] == (uint32_t)' ') |
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451 | continue; |
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452 | |
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453 | if(dst->chars[dstix + i] != src->chars[srcix + i] || |
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454 | dst->attrs[dstix + i] != src->attrs[srcix + i]) |
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455 | { |
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456 | dst->chars[dstix + i] = src->chars[srcix + i]; |
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457 | dst->attrs[dstix + i] = src->attrs[srcix + i]; |
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458 | if(!dst->dirty_disabled) |
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459 | caca_add_dirty_rect(dst, x + starti + i, y + j, 1, 1); |
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460 | } |
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461 | } |
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462 | } |
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463 | else |
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464 | { |
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465 | if(memcmp(dst->chars + dstix, src->chars + srcix, stride * 4) || |
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466 | memcmp(dst->attrs + dstix, src->attrs + srcix, stride * 4)) |
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467 | { |
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468 | /* FIXME be more precise ? */ |
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469 | memcpy(dst->chars + dstix, src->chars + srcix, stride * 4); |
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470 | memcpy(dst->attrs + dstix, src->attrs + srcix, stride * 4); |
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471 | if(!dst->dirty_disabled) |
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472 | caca_add_dirty_rect(dst, x + starti, y + j, stride, 1); |
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473 | } |
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474 | } |
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475 | |
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476 | /* Fix split fullwidth chars */ |
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477 | if(src->chars[srcix] == CACA_MAGIC_FULLWIDTH) |
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478 | dst->chars[dstix] = ' '; |
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479 | |
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480 | if(endi < src->width && src->chars[endi] == CACA_MAGIC_FULLWIDTH) |
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481 | dst->chars[dstix + stride - 1] = ' '; |
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482 | } |
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483 | |
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484 | |
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485 | return 0; |
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486 | } |
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487 | |
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488 | /** \brief Set a canvas' new boundaries. |
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489 | * |
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490 | * Set new boundaries for a canvas. This function can be used to crop a |
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491 | * canvas, to expand it or for combinations of both actions. All frames |
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492 | * are affected by this function. |
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493 | * |
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494 | * If an error occurs, -1 is returned and \b errno is set accordingly: |
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495 | * - \c EINVAL Specified width or height is invalid. |
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496 | * - \c EBUSY The canvas is in use by a display driver and cannot be resized. |
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497 | * - \c ENOMEM Not enough memory for the requested canvas size. If this |
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498 | * happens, the canvas handle becomes invalid and should not be used. |
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499 | * |
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500 | * \param cv The canvas to crop. |
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501 | * \param x X coordinate of the top-left corner. |
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502 | * \param y Y coordinate of the top-left corner. |
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503 | * \param w The width of the cropped area. |
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504 | * \param h The height of the cropped area. |
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505 | * \return 0 in case of success, -1 if an error occurred. |
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506 | */ |
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507 | int caca_set_canvas_boundaries(caca_canvas_t *cv, int x, int y, int w, int h) |
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508 | { |
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509 | caca_canvas_t *new; |
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510 | int f, saved_f, framecount; |
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511 | |
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512 | if(cv->refcount) |
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513 | { |
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514 | seterrno(EBUSY); |
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515 | return -1; |
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516 | } |
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517 | |
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518 | if(w < 0 || h < 0) |
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519 | { |
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520 | seterrno(EINVAL); |
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521 | return -1; |
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522 | } |
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523 | |
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524 | new = caca_create_canvas(w, h); |
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525 | |
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526 | framecount = caca_get_frame_count(cv); |
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527 | saved_f = cv->frame; |
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528 | |
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529 | for(f = 0; f < framecount; f++) |
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530 | { |
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531 | if(f) |
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532 | caca_create_frame(new, framecount); |
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533 | |
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534 | caca_set_frame(cv, f); |
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535 | caca_set_frame(new, f); |
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536 | caca_blit(new, -x, -y, cv, NULL); |
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537 | free(cv->frames[f].chars); |
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538 | free(cv->frames[f].attrs); |
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539 | } |
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540 | free(cv->frames); |
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541 | |
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542 | cv->frames = new->frames; |
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543 | free(new); |
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544 | |
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545 | caca_set_frame(cv, saved_f); |
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546 | _caca_load_frame_info(cv); |
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547 | |
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548 | /* FIXME: this may be optimised somewhat */ |
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549 | if(!cv->dirty_disabled) |
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550 | caca_add_dirty_rect(cv, 0, 0, cv->width, cv->height); |
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551 | |
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552 | return 0; |
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553 | } |
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554 | |
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555 | /* |
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556 | * XXX: The following functions are aliases. |
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557 | */ |
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558 | |
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559 | int cucul_gotoxy(cucul_canvas_t *, int, int) CACA_ALIAS(caca_gotoxy); |
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560 | int cucul_get_cursor_x(cucul_canvas_t const *) CACA_ALIAS(caca_get_cursor_x); |
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561 | int cucul_get_cursor_y(cucul_canvas_t const *) CACA_ALIAS(caca_get_cursor_y); |
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562 | int cucul_put_char(cucul_canvas_t *, int, int, uint32_t) |
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563 | CACA_ALIAS(caca_put_char); |
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564 | uint32_t cucul_get_char(cucul_canvas_t const *, int, int) |
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565 | CACA_ALIAS(caca_get_char); |
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566 | int cucul_put_str(cucul_canvas_t *, int, int, char const *) |
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567 | CACA_ALIAS(caca_put_str); |
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568 | int cucul_printf(cucul_canvas_t *, int, int, char const *, ...) |
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569 | CACA_ALIAS(caca_printf); |
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570 | int cucul_clear_canvas(cucul_canvas_t *) CACA_ALIAS(caca_clear_canvas); |
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571 | int cucul_set_canvas_handle(cucul_canvas_t *, int, int) |
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572 | CACA_ALIAS(caca_set_canvas_handle); |
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573 | int cucul_get_canvas_handle_x(cucul_canvas_t const *) |
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574 | CACA_ALIAS(caca_get_canvas_handle_x); |
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575 | int cucul_get_canvas_handle_y(cucul_canvas_t const *) |
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576 | CACA_ALIAS(caca_get_canvas_handle_y); |
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577 | int cucul_blit(cucul_canvas_t *, int, int, cucul_canvas_t const *, |
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578 | cucul_canvas_t const *) CACA_ALIAS(caca_blit); |
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579 | int cucul_set_canvas_boundaries(cucul_canvas_t *, int, int, int, int) |
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580 | CACA_ALIAS(caca_set_canvas_boundaries); |
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581 | |
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