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annotate molko-js/src/js-font.c @ 190:5dc57029b9f1

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molko-js: allow objects/parameters in Molko.Painter API
author David Demelier <markand@malikania.fr>
date Sat, 07 Nov 2020 10:16:38 +0100
parents a5436e15898d
children dd77bfb38df2
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189
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1 /*
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2 * js-font.c -- basic font management (Javascript bindings)
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3 *
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4 * Copyright (c) 2020 David Demelier <markand@malikania.fr>
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5 *
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6 * Permission to use, copy, modify, and/or distribute this software for any
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7 * purpose with or without fee is hereby granted, provided that the above
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8 * copyright notice and this permission notice appear in all copies.
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9 *
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10 * THE SOFTWARE IS PROVIDED "AS IS" AND THE AUTHOR DISCLAIMS ALL WARRANTIES
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11 * WITH REGARD TO THIS SOFTWARE INCLUDING ALL IMPLIED WARRANTIES OF
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12 * MERCHANTABILITY AND FITNESS. IN NO EVENT SHALL THE AUTHOR BE LIABLE FOR
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13 * ANY SPECIAL, DIRECT, INDIRECT, OR CONSEQUENTIAL DAMAGES OR ANY DAMAGES
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14 * WHATSOEVER RESULTING FROM LOSS OF USE, DATA OR PROFITS, WHETHER IN AN
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15 * ACTION OF CONTRACT, NEGLIGENCE OR OTHER TORTIOUS ACTION, ARISING OUT OF
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16 * OR IN CONNECTION WITH THE USE OR PERFORMANCE OF THIS SOFTWARE.
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17 */
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18
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19 #include <assert.h>
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20
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21 #include <duktape.h>
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22
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23 #include <core/alloc.h>
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24 #include <core/error.h>
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25 #include <core/font.h>
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26 #include <core/texture.h>
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27
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28 #include "js-font.h"
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29 #include "js-texture.h"
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30 #include "js.h"
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31 #include "js_p.h"
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32
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33 #define SYMBOL DUK_HIDDEN_SYMBOL("molko::font")
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34 #define PROTO DUK_HIDDEN_SYMBOL("molko::font::prototype")
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35
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36 static struct font *
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37 js_font_this(duk_context *ctx)
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38 {
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39 struct font *font;
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40
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41 duk_push_this(ctx);
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42 duk_get_prop_string(ctx, -1, SYMBOL);
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43 font = duk_to_pointer(ctx, -1);
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44 duk_pop_n(ctx, 2);
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45
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46 if (!font)
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47 duk_error(ctx, DUK_ERR_TYPE_ERROR, "Not a Font object");
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48
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49 return font;
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50 }
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51
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52 static duk_ret_t
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53 js_font_getHeight(duk_context *ctx)
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54 {
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55 duk_push_uint(ctx, font_height(js_font_this(ctx)));
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56
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57 return 1;
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58 }
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59
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60 static duk_ret_t
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61 js_font_fromPath(duk_context *ctx)
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62 {
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63 struct font font;
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64 const char *path = duk_require_string(ctx, 0);
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65 unsigned int size = duk_require_uint(ctx, 1);
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66
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67 if (!font_open(&font, path, size))
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68 duk_error(ctx, DUK_ERR_ERROR, "%s", error());
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69
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70 duk_push_object(ctx);
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71 duk_push_global_stash(ctx);
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72 duk_get_prop_string(ctx, -1, PROTO);
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73 duk_remove(ctx, -2);
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74 duk_push_pointer(ctx, alloc_dup(&font, sizeof (font)));
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75 duk_put_prop_string(ctx, -3, SYMBOL);
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76 duk_set_prototype(ctx, -2);
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77 duk_push_string(ctx, "height");
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78 duk_push_c_function(ctx, js_font_getHeight, 0);
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79 duk_def_prop(ctx, -3, DUK_DEFPROP_HAVE_GETTER);
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80
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81 return 1;
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82 }
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83
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84 static duk_ret_t
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85 js_font_render(duk_context *ctx)
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86 {
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87 struct font *font = js_font_this(ctx);
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88 struct texture tex;
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89 const char *text = duk_require_string(ctx, 0);
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90 unsigned long color = duk_require_number(ctx, 1);
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91
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92 if (!font_render(font, &tex, text, color))
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93 duk_error(ctx, DUK_ERR_ERROR, "%s", error());
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94
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95 js_texture_push(js_self(ctx), &tex);
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96
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97 return 1;
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98 }
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99
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100 static duk_ret_t
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101 js_font_query(duk_context *ctx)
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102 {
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103 struct font *font = js_font_this(ctx);
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104 const char *text = duk_require_string(ctx, 0);
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105 unsigned int w, h;
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106
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107 if (!font_query(font, text, &w, &h))
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108 duk_error(ctx, DUK_ERR_ERROR, "%s", error());
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109
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110 duk_push_object(ctx);
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111 duk_push_uint(ctx, w);
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112 duk_put_prop_string(ctx, -2, "w");
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113 duk_push_uint(ctx, h);
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114 duk_put_prop_string(ctx, -2, "h");
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115
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116 return 1;
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117 }
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118
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119 static duk_ret_t
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120 js_font_finish(duk_context *ctx)
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121 {
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122 struct font *font;
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123
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124 duk_get_prop_string(ctx, 0, SYMBOL);
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125 font = duk_to_pointer(ctx, -1);
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126 duk_pop(ctx);
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127 duk_del_prop_string(ctx, 0, SYMBOL);
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128
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129 if (font) {
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130 font_finish(font);
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131 free(font);
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132 }
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133
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134 return 0;
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135 }
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136
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137 static const duk_function_list_entry functions[] = {
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138 { "fromPath", js_font_fromPath, 2 },
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139 { NULL, NULL, 0 }
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140 };
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141
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142 static const duk_function_list_entry methods[] = {
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143 { "render", js_font_render, 2 },
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144 { "query", js_font_query, 1 },
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145 { NULL, NULL, 0 }
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146 };
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147
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148 void
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149 js_font_load(struct js *js)
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150 {
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151 assert(js);
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152
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153 duk_push_global_object(js->handle);
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154 duk_get_prop_string(js->handle, -1, "Molko");
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155 duk_push_object(js->handle);
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156 duk_put_function_list(js->handle, -1, functions);
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157 duk_put_prop_string(js->handle, -2, "Font");
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158 duk_push_global_stash(js->handle);
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159 duk_push_object(js->handle);
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160 duk_put_function_list(js->handle, -1, methods);
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161 duk_push_c_function(js->handle, js_font_finish, 1);
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162 duk_set_finalizer(js->handle, -2);
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163 duk_put_prop_string(js->handle, -2, PROTO);
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164 duk_pop_n(js->handle, 3);
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165 }