Mercurial > MadButterfly

comparison nodejs/image_ldr.cc @ 639:dc32c1c140ae

Find changesets by keywords (author, files, the commit message), revision number or hash, or revset expression.
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
comparison
equal deleted inserted replaced
638:683889344459 639:dc32c1c140ae
1 /*! \file
2 * This file implements Javascript binding for img_ldr_t of MadButterfly.
3 */
4 #include <v8.h>
5
6 extern "C" {
7 #include "mb.h"
8 }
9
10 #include "mbfly_njs.h"
11
12 using namespace v8;
13
14 #ifndef ASSERT
15 #define ASSERT(x)
16 #endif
17
18 static Persistent<ObjectTemplate> img_data_temp;
19
20 /*! \brief load() method of img_ldr Javascript objects.
21 */
22 static Handle<Value>
23 xnjsmb_img_ldr_load(const Arguments &args) {
24 HandleScope scope;
25 int argc = args.Length();
26 Handle<Object> self = args.This();
27 char *img_id;
28 mb_img_ldr_t *img_ldr;
29 mb_img_data_t *img_data;
30 Handle<Object> img_data_obj;
31
32 if(argc != 1)
33 THROW("Invalid number of arguments (!= 1)");
34 if(!args[0]->IsString())
35 THROW("Invalid argument type");
36
37 String::Utf8Value img_id_utf8(args[0]->ToString());
38 img_id = *img_id_utf8;
39 img_ldr = (mb_img_ldr_t *)UNWRAP(self);
40
41 img_data_obj = img_data_temp->NewInstance();
42 ASSERT(img_data_obj);
43
44 img_data = MB_IMG_LDR_LOAD(img_ldr, img_id);
45 if(img_data == NULL)
46 THROW("Can not load an image");
47 WRAP(img_data_obj, img_data);
48
49 scope.Close(img_data_obj);
50
51 return img_data_obj;
52 }
53
54 /*! \brief Constructor function of img_ldr Javascript objects.
55 */
56 static Handle<Value>
57 xnjsmb_img_ldr_new(const Arguments &args) {
58 HandleScope scope;
59 int argc = args.Length();
60 Handle<Object> self = args.This();
61 char *path;
62 mb_img_ldr_t *img_ldr;
63
64 if(argc != 1)
65 THROW("Invalid number of arguments (!= 1)");
66 if(!args[0]->IsString())
67 THROW("Invalid argument type");
68
69 String::Utf8Value pathutf8(args[0]->ToString());
70 path = *pathutf8;
71
72 img_ldr = simple_mb_img_ldr_new(path);
73 if(img_ldr == NULL)
74 THROW("Can not create an image loader");
75 WRAP(self, img_ldr);
76
77 return Null();
78 }
79
80 /*! \brief Initialize image loader.
81 *
82 * This function is called by init() in mbfly_njs.cc when the module
83 * being loaded.
84 */
85 void
86 xnjsmb_img_ldr_init_mb_rt_temp(Handle<Object> rt_temp) {
87 HandleScope scope;
88 Handle<FunctionTemplate> img_ldr_new_temp;
89 Handle<ObjectTemplate> ldr_inst_temp;
90 Handle<ObjectTemplate> ldr_proto_temp;
91 Handle<FunctionTemplate> img_ldr_load_temp;
92 Handle<ObjectTemplate> _img_data_temp;
93
94 /* Setup object template for img_data_t object for Javascript */
95 _img_data_temp = ObjectTemplate::New();
96 _img_data_temp->SetInternalFieldCount(1);
97 img_data_temp = Persistent<ObjectTemplate>::New(_img_data_temp);
98
99 /* Setup img_ldr class */
100 img_ldr_new_temp = FunctionTemplate::New(xnjsmb_img_ldr_new);
101 img_ldr_new_temp->SetClassName(String::New("img_ldr"));
102 ldr_inst_temp = img_ldr_new_temp->InstanceTemplate();
103 ldr_inst_temp->SetInternalFieldCount(1);
104
105 /* Set method load() for img_ldr */
106 ldr_proto_temp = img_ldr_new_temp->PrototypeTemplate();
107 img_ldr_load_temp = FunctionTemplate::New(xnjsmb_img_ldr_load);
108 SET(ldr_proto_temp, "load", img_ldr_load_temp);
109
110 SET(rt_temp, "img_ldr_new", img_ldr_new_temp->GetFunction());
111 }