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First compilable image loader binding for Javascript
author Thinker K.F. Li <thinker@branda.to>
date Mon, 26 Jul 2010 20:13:58 +0800
parents
children 9016e7e70f7d
rev   line source
639
dc32c1c140ae First compilable image loader binding for Javascript
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1 /*! \file
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2 * This file implements Javascript binding for img_ldr_t of MadButterfly.
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3 */
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4 #include <v8.h>
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5
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6 extern "C" {
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7 #include "mb.h"
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8 }
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9
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10 #include "mbfly_njs.h"
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11
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12 using namespace v8;
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13
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14 #ifndef ASSERT
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15 #define ASSERT(x)
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16 #endif
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17
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18 static Persistent<ObjectTemplate> img_data_temp;
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19
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20 /*! \brief load() method of img_ldr Javascript objects.
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21 */
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22 static Handle<Value>
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23 xnjsmb_img_ldr_load(const Arguments &args) {
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24 HandleScope scope;
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25 int argc = args.Length();
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26 Handle<Object> self = args.This();
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27 char *img_id;
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28 mb_img_ldr_t *img_ldr;
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29 mb_img_data_t *img_data;
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30 Handle<Object> img_data_obj;
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31
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32 if(argc != 1)
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33 THROW("Invalid number of arguments (!= 1)");
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34 if(!args[0]->IsString())
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35 THROW("Invalid argument type");
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36
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37 String::Utf8Value img_id_utf8(args[0]->ToString());
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38 img_id = *img_id_utf8;
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39 img_ldr = (mb_img_ldr_t *)UNWRAP(self);
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40
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41 img_data_obj = img_data_temp->NewInstance();
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42 ASSERT(img_data_obj);
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43
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44 img_data = MB_IMG_LDR_LOAD(img_ldr, img_id);
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45 if(img_data == NULL)
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46 THROW("Can not load an image");
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47 WRAP(img_data_obj, img_data);
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48
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49 scope.Close(img_data_obj);
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50
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51 return img_data_obj;
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52 }
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53
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54 /*! \brief Constructor function of img_ldr Javascript objects.
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55 */
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56 static Handle<Value>
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57 xnjsmb_img_ldr_new(const Arguments &args) {
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58 HandleScope scope;
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59 int argc = args.Length();
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60 Handle<Object> self = args.This();
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61 char *path;
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62 mb_img_ldr_t *img_ldr;
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63
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64 if(argc != 1)
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65 THROW("Invalid number of arguments (!= 1)");
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66 if(!args[0]->IsString())
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67 THROW("Invalid argument type");
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68
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69 String::Utf8Value pathutf8(args[0]->ToString());
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70 path = *pathutf8;
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71
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72 img_ldr = simple_mb_img_ldr_new(path);
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73 if(img_ldr == NULL)
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74 THROW("Can not create an image loader");
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75 WRAP(self, img_ldr);
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76
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77 return Null();
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78 }
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79
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80 /*! \brief Initialize image loader.
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81 *
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82 * This function is called by init() in mbfly_njs.cc when the module
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83 * being loaded.
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84 */
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85 void
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86 xnjsmb_img_ldr_init_mb_rt_temp(Handle<Object> rt_temp) {
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87 HandleScope scope;
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88 Handle<FunctionTemplate> img_ldr_new_temp;
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89 Handle<ObjectTemplate> ldr_inst_temp;
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90 Handle<ObjectTemplate> ldr_proto_temp;
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91 Handle<FunctionTemplate> img_ldr_load_temp;
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92 Handle<ObjectTemplate> _img_data_temp;
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93
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94 /* Setup object template for img_data_t object for Javascript */
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95 _img_data_temp = ObjectTemplate::New();
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96 _img_data_temp->SetInternalFieldCount(1);
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97 img_data_temp = Persistent<ObjectTemplate>::New(_img_data_temp);
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98
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99 /* Setup img_ldr class */
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100 img_ldr_new_temp = FunctionTemplate::New(xnjsmb_img_ldr_new);
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101 img_ldr_new_temp->SetClassName(String::New("img_ldr"));
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102 ldr_inst_temp = img_ldr_new_temp->InstanceTemplate();
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103 ldr_inst_temp->SetInternalFieldCount(1);
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104
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105 /* Set method load() for img_ldr */
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106 ldr_proto_temp = img_ldr_new_temp->PrototypeTemplate();
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107 img_ldr_load_temp = FunctionTemplate::New(xnjsmb_img_ldr_load);
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108 SET(ldr_proto_temp, "load", img_ldr_load_temp);
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109
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110 SET(rt_temp, "img_ldr_new", img_ldr_new_temp->GetFunction());
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111 }