annotate nodejs/coord.cc @ 742:24038e7a365b

Reorder instructions to invalidate coords correctly
author Thinker K.F. Li <thinker@codemud.net>
date Wed, 25 Aug 2010 11:58:30 +0800
parents d8764f10e141
children dd1f3382d6a4
rev   line source
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0ca8437a91fa Implement Indexed Property interceptors
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1 #include <stdio.h>
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2 #include <v8.h>
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3
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4 extern "C" {
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5 #include "mb.h"
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6 #include "mb_X_supp.h"
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7 #include "mb_tools.h"
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8 #include "X_supp_njs.h"
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9 }
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10
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ce7a35abcb0d Function to instantiate coord for Javascript
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11 #include "mbfly_njs.h"
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12
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13 #ifndef ASSERT
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14 #define ASSERT(x)
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15 #endif
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16
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17 /*! \page jsgc How to Manage Life-cycle of Objects for Javascript.
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18 *
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19 * The life-cycle of MadButterfly ojects are simple. A object is live
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20 * when it is created and dead when it is free. When a coord or shape
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21 * is free, it is also removed from the tree. There is not way to
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22 * remove a coord or a shape without freeing it. So, if you want to
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23 * remove a coord or a shape object from the tree, you can only free
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24 * it.
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25 *
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26 * Javascript, in conventional, does not free an object. It has GC,
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27 * the engine, being used, will free an object if it is no more
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28 * referenced. So, we had better provide a removing function, but
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29 * actually free an object. In idea situation, a new MB object would
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30 * be created for and attached on the JS object, when an object added
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31 * back to the tree. But, it means we need to keep states of an
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32 * object and create a new one with the same states later. It is
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33 * complicated. So, once an object is removed, it is invalidated.
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34 *
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35 * I hope someone would implement a higher abstract layer, in JS, to
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36 * implement the idea model that recreate a new object when an
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37 * invalidated JS object being added back.
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38 *
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39 * An invalid object is the one with NULL internal field and obj.valid
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40 * == false. The binding of MadButterfly hold a reference to every
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41 * object added to the tree of a mbrt (runtime object), and remove the
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42 * reference and invalidate it when it being removed.
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43 *
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44 * For coords, they are always attached to the tree when it is valid.
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45 * So, binding hold a persistent reference to it. The reference is
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46 * purged when a coord being removed from the tree and being
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47 * invalidated.
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48 *
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49 * For any shape, it is not attached to the tree at begining, but is
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50 * attached to a tree laterly, or is collected by GC. The binding
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51 * hold a weak reference for a new shape, and upgrade to a strong
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52 * reference when the shape being added to the tree.
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53 */
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54
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55 using namespace v8;
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56
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b346e4699e55 Add more comment for JS binding
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57 /*! \defgroup xnjsmb_coord JS binding for coord objects.
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58 * \ingroup xnjsmb
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59 *
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60 * @{
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61 */
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62 /*! \brief Invalidate JS objects for coords and shapes in a subtree.
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63 *
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64 * \param self is the object of the root of subtree.
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65 *
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66 * \sa \ref jsgc
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67 */
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68 static void
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69 xnjsmb_coord_invalidate_subtree(Handle<Object> self) {
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70 Persistent<Object> *child_hdl;
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71 Persistent<Object> *mem_hdl;
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72 redraw_man_t *rdman;
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73 coord_t *coord, *child;
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74 shape_t *mem;
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75 Handle<Value> _false = Boolean::New(0);
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76
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77 if(!GET(self, "valid")->ToBoolean()->Value()) /* Invalidated object */
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78 return;
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79
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80 coord = (coord_t *)UNWRAP(self);
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81
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82 /* Invalidate all coords in the subtree */
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83 FOR_COORDS_PREORDER(coord, child) {
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84 child_hdl = (Persistent<Object> *)mb_prop_get(&child->obj.props,
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85 PROP_JSOBJ);
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86 SET(*child_hdl, "valid", _false);
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87 WRAP(*child_hdl, NULL);
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88
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89 /* Invalidate members of a coord */
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90 FOR_COORD_SHAPES(child, mem) {
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91 mem_hdl = (Persistent<Object> *)mb_prop_get(&mem->obj.props,
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92 PROP_JSOBJ);
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93 SET(*mem_hdl, "valid", _false);
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94 WRAP(*mem_hdl, NULL);
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95 }
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96 }
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97 }
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98
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99 static void
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100 xnjsmb_coord_mod(Handle<Object> self, coord_t *coord) {
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101 Persistent<Object> *self_hdl;
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102 subject_t *subject;
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103 Handle<Value> subject_o;
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104
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105 /* Keep associated js object in property store for retrieving,
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106 * later, without create new js object.
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107 */
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108 self_hdl = new Persistent<Object>(self);
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109 mb_prop_set(&coord->obj.props, PROP_JSOBJ, self_hdl);
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110
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111 subject = coord->mouse_event;
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112 subject_o = export_xnjsmb_auto_subject_new(subject);
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113 SET(self, "mouse_event", subject_o);
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114 SET(self, "valid", Boolean::New(1));
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115 }
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116
661
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117 static float
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118 coord_get_index(coord_t *coord, Handle<Object> self, int idx,
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119 const char **err) {
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120 if(idx < 0 || idx >= 6) {
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121 *err = "Invalid index: out of range";
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122 return 0;
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123 }
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124
661
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125 return coord_get_matrix(coord)[idx];
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126 }
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127
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128 static float
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129 coord_set_index(coord_t *coord, Handle<Object> self,
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130 int idx, float v, const char **err) {
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131 Handle<Object> js_rt;
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132 redraw_man_t *rdman;
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133
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134 if(idx < 0 || idx >= 6) {
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135 *err = "Invalid index: out of range";
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136 return 0;
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137 }
557
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138
661
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139 coord_get_matrix(coord)[idx] = v;
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140
560
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141 js_rt = GET(self, "mbrt")->ToObject();
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142 rdman = xnjsmb_rt_rdman(js_rt);
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143 rdman_coord_changed(rdman, coord);
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144
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145 return v;
557
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146 }
560
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147
661
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148 static void
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149 xnjsmb_coord_add_shape(coord_t *coord, Handle<Object> self,
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150 shape_t *shape, const char **err) {
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151 Handle<Object> js_rt;
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152 redraw_man_t *rdman;
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153 int r;
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154
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155 js_rt = GET(self, "mbrt")->ToObject();
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156 rdman = xnjsmb_rt_rdman(js_rt);
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157 r = rdman_add_shape(rdman, shape, coord);
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158 if(r != 0)
661
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159 *err = "Unknown error";
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160 }
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161
741
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162 static void
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163 xnjsmb_coord_remove(coord_t *coord, Handle<Object> self, const char **err) {
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164 Handle<Object> js_rt;
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165 redraw_man_t *rdman;
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166
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167 js_rt = GET(self, "mbrt")->ToObject();
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168 rdman = xnjsmb_rt_rdman(js_rt);
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169
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170 xnjsmb_coord_invalidate_subtree(self);
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171
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172 /* Free all coords and shapes in the subtree */
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173 rdman_coord_free(rdman, coord);
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174 }
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175
661
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176 #include "coord-inc.h"
562
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177
684
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178 /*! \brief This function used by \ref xnjsmb_mb_rt to wrap coord object.
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179 */
666
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180 Handle<Value> export_xnjsmb_auto_coord_new(coord_t *coord) {
695
763a4e2bbd85 Return the value of ojbject to fix the crash issue
wycc
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181 return xnjsmb_auto_coord_new(coord);
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182 }
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183
562
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184 /*! \brief Initialize Javascript object for root coord of a runtime.
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185 *
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186 * \param js_rt is the runtime object to create the root object for.
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187 *
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188 * After the function, js_rt.root is the object for root coord in
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189 * Javascript.
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190 */
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191 void
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192 xnjsmb_coord_mkroot(Handle<Object> js_rt) {
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193 redraw_man_t *rdman;
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194 coord_t *root;
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195 Handle<Object> obj;
661
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196 static int init_flag = 0;
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197
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198 if(!init_flag) {
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199 xnjsmb_auto_coord_init();
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200 init_flag = 1;
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201 }
562
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diff changeset
202
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203 rdman = xnjsmb_rt_rdman(js_rt);
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parents: 560
diff changeset
204 root = rdman_get_root(rdman);
661
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diff changeset
205 obj = xnjsmb_auto_coord_new(root).As<Object>();
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diff changeset
206 SET(obj, "mbrt", js_rt);
562
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diff changeset
207
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diff changeset
208 SET(js_rt, "root", obj);
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diff changeset
209 }
684
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diff changeset
210
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parents: 680
diff changeset
211 /* @} */