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annotate src/libmlk-core-js/core/js-drawable.c @ 363:c74ab1bbedec

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js: add drawable bindings
author David Demelier <markand@malikania.fr>
date Sun, 24 Oct 2021 09:55:12 +0200
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children 8ac282bd5935
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1 /*
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2 * js-drawable.c -- core drawable binding
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3 *
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4 * Copyright (c) 2020-2021 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 <core/alloc.h>
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22 #include <core/drawable.h>
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23
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24 #include "js-drawable.h"
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25
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26 #define SIGNATURE DUK_HIDDEN_SYMBOL("Mlk.Drawable")
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27
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28 struct self {
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29 duk_context *ctx;
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30 void *ptr;
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31 struct drawable dw;
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32 unsigned int refc;
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33 };
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34
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35 static inline struct self *
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36 self(duk_context *ctx)
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37 {
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38 struct self *sf = NULL;
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39
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40 duk_push_this(ctx);
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41 duk_get_prop_string(ctx, -1, SIGNATURE);
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42 sf = duk_to_pointer(ctx, -1);
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43 duk_pop_2(ctx);
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44
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45 if (!sf)
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46 duk_error(ctx, DUK_ERR_TYPE_ERROR, "not a Drawable object");
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47
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48 return sf;
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49 }
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50
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51 static inline int
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52 callable(struct self *s, const char *prop, duk_context **ctx)
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53 {
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54 int callable;
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55
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56 if (!s->ptr)
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57 return 0;
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58
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59 duk_push_heapptr(s->ctx, s->ptr);
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60 duk_get_prop_string(s->ctx, -1, prop);
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61 duk_remove(s->ctx, -2);
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62
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63 if (duk_is_callable(s->ctx, -1)) {
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64 *ctx = s->ctx;
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65 callable = 1;
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66 } else {
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67 *ctx = NULL;
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68 callable = 0;
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69 duk_pop(s->ctx);
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70 }
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71
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72 return callable;
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73 }
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74
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75 static int
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76 update(struct drawable *dw, unsigned int ticks)
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77 {
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78 duk_context *ctx;
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79 int ret = 0;
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80
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81 if (callable(dw->data, "update", &ctx)) {
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82 duk_push_uint(ctx, ticks);
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83 duk_call(ctx, 1);
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84 ret = duk_to_int(ctx, -1);
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85 }
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86
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87 return ret;
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88 }
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89
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90 static void
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91 draw(struct drawable *dw)
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92 {
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93 duk_context *ctx;
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94
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95 if (callable(dw->data, "draw", &ctx))
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96 duk_call(ctx, 0);
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97 }
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98
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99 static void
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100 end(struct drawable *dw)
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101 {
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102 duk_context *ctx;
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103
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104 if (callable(dw->data, "end", &ctx))
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105 duk_call(ctx, 0);
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106 }
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107
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108 static void
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109 finish(struct drawable *dw)
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110 {
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111 struct self *sf = dw->data;
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112
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113 if (!--sf->refc)
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114 free(sf);
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115 }
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116
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117 static duk_ret_t
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118 Drawable_getX(duk_context *ctx)
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119 {
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120 duk_push_uint(ctx, self(ctx)->dw.x);
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121
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122 return 1;
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123 }
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124
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125 static duk_ret_t
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126 Drawable_setX(duk_context *ctx)
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127 {
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128 self(ctx)->dw.x = duk_require_uint(ctx, 0);
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129
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130 return 0;
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131 }
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132
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133 static duk_ret_t
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134 Drawable_getY(duk_context *ctx)
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135 {
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136 duk_push_uint(ctx, self(ctx)->dw.y);
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137
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138 return 1;
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139 }
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140
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141 static duk_ret_t
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142 Drawable_setY(duk_context *ctx)
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143 {
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144 self(ctx)->dw.y = duk_require_uint(ctx, 0);
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145
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146 return 0;
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147 }
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148
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149 static duk_ret_t
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150 Drawable_constructor(duk_context *ctx)
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151 {
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152 struct self *self;
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153 const int x = duk_require_int(ctx, 0);
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154 const int y = duk_require_int(ctx, 1);
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155
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156 self = alloc_new0(sizeof (*self));
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157 self->refc = 1;
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158 self->ctx = ctx;
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159 self->dw.x = x;
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160 self->dw.y = y;
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161 self->dw.data = self;
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162 self->dw.update = update;
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163 self->dw.finish = finish;
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164 self->dw.draw = draw;
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165 self->dw.end = end;
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166
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167 duk_push_this(ctx);
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168 self->ptr = duk_get_heapptr(ctx, -1);
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169 duk_push_pointer(ctx, self);
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170 duk_put_prop_string(ctx, -2, SIGNATURE);
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171 duk_push_string(ctx, "x");
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172 duk_push_c_function(ctx, Drawable_getX, 0);
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173 duk_push_c_function(ctx, Drawable_setX, 1);
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174 duk_def_prop(ctx, -4, DUK_DEFPROP_HAVE_GETTER | DUK_DEFPROP_HAVE_SETTER);
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175 duk_push_string(ctx, "y");
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176 duk_push_c_function(ctx, Drawable_getY, 0);
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177 duk_push_c_function(ctx, Drawable_setY, 1);
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178 duk_def_prop(ctx, -4, DUK_DEFPROP_HAVE_GETTER | DUK_DEFPROP_HAVE_SETTER);
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179 duk_pop(ctx);
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180
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181 return 0;
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182 }
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183
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184 static duk_ret_t
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185 Drawable_destructor(duk_context *ctx)
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186 {
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187 struct self *sf;
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188
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189 duk_get_prop_string(ctx, 0, SIGNATURE);
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190
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191 if ((sf = duk_to_pointer(ctx, -1))) {
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192 sf->ptr = NULL;
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193 drawable_finish(&sf->dw);
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194 }
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195
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196 duk_del_prop_string(ctx, 0, SIGNATURE);
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197 duk_pop(ctx);
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198
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199 return 0;
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200 }
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201
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202
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203 void
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204 js_drawable_bind(duk_context *ctx)
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205 {
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206 assert(ctx);
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207
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208 duk_push_c_function(ctx, Drawable_constructor, 2);
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209 duk_push_object(ctx);
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210 duk_push_c_function(ctx, Drawable_destructor, 1);
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211 duk_set_finalizer(ctx, -2);
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212 duk_put_prop_string(ctx, -2, "prototype");
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213 duk_put_global_string(ctx, "Drawable");
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214 }
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215
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216 struct drawable *
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217 js_drawable_require(duk_context *ctx, duk_idx_t idx)
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218 {
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219 struct self *sf = NULL;
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220
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221 if (duk_is_object(ctx, idx)) {
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222 duk_get_prop_string(ctx, idx, SIGNATURE);
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223 sf = duk_to_pointer(ctx, -1);
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224 duk_pop(ctx);
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225 }
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226
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227 if (!sf)
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228 duk_error(ctx, DUK_ERR_TYPE_ERROR, "not a Drawable object");
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229
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230 sf->refc++;
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231
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232 return &sf->dw;
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233 }