1 // ==========================================================
2 // MNG loader
3 //
4 // Design and implementation by
5 // - Herve Drolon (drolon@infonie.fr)
6 //
7 // This file is part of FreeImage 3
8 //
9 // COVERED CODE IS PROVIDED UNDER THIS LICENSE ON AN "AS IS" BASIS, WITHOUT WARRANTY
10 // OF ANY KIND, EITHER EXPRESSED OR IMPLIED, INCLUDING, WITHOUT LIMITATION, WARRANTIES
11 // THAT THE COVERED CODE IS FREE OF DEFECTS, MERCHANTABLE, FIT FOR A PARTICULAR PURPOSE
12 // OR NON-INFRINGING. THE ENTIRE RISK AS TO THE QUALITY AND PERFORMANCE OF THE COVERED
13 // CODE IS WITH YOU. SHOULD ANY COVERED CODE PROVE DEFECTIVE IN ANY RESPECT, YOU (NOT
14 // THE INITIAL DEVELOPER OR ANY OTHER CONTRIBUTOR) ASSUME THE COST OF ANY NECESSARY
15 // SERVICING, REPAIR OR CORRECTION. THIS DISCLAIMER OF WARRANTY CONSTITUTES AN ESSENTIAL
16 // PART OF THIS LICENSE. NO USE OF ANY COVERED CODE IS AUTHORIZED HEREUNDER EXCEPT UNDER
17 // THIS DISCLAIMER.
18 //
19 // Use at your own risk!
20 // ==========================================================
21
22 #include "FreeImage.h"
23 #include "Utilities.h"
24
25 // ==========================================================
26 // Plugin Interface
27 // ==========================================================
28
29 static int s_format_id;
30
31 // ----------------------------------------------------------
32
33 #define MNG_SIGNATURE_SIZE 8 // size of the signature
34
35 // ----------------------------------------------------------
36
37 // ----------------------------------------------------------
38 // mng interface (see MNGHelper.cpp)
39 // ----------------------------------------------------------
40
41 FIBITMAP* mng_ReadChunks(int format_id, FreeImageIO *io, fi_handle handle, long Offset, int flags = 0);
42
43
44 // ==========================================================
45 // Plugin Implementation
46 // ==========================================================
47
48 static const char * DLL_CALLCONV
Format()49 Format() {
50 return "MNG";
51 }
52
53 static const char * DLL_CALLCONV
Description()54 Description() {
55 return "Multiple-image Network Graphics";
56 }
57
58 static const char * DLL_CALLCONV
Extension()59 Extension() {
60 return "mng";
61 }
62
63 static const char * DLL_CALLCONV
RegExpr()64 RegExpr() {
65 return NULL;
66 }
67
68 static const char * DLL_CALLCONV
MimeType()69 MimeType() {
70 return "video/x-mng";
71 }
72
73 static BOOL DLL_CALLCONV
Validate(FreeImageIO * io,fi_handle handle)74 Validate(FreeImageIO *io, fi_handle handle) {
75 BYTE mng_signature[8] = { 138, 77, 78, 71, 13, 10, 26, 10 };
76 BYTE signature[8] = { 0, 0, 0, 0, 0, 0, 0, 0 };
77
78 io->read_proc(&signature, 1, MNG_SIGNATURE_SIZE, handle);
79
80 return (memcmp(mng_signature, signature, MNG_SIGNATURE_SIZE) == 0) ? TRUE : FALSE;
81 }
82
83 static BOOL DLL_CALLCONV
SupportsExportDepth(int depth)84 SupportsExportDepth(int depth) {
85 return FALSE;
86 }
87
88 static BOOL DLL_CALLCONV
SupportsExportType(FREE_IMAGE_TYPE type)89 SupportsExportType(FREE_IMAGE_TYPE type) {
90 return FALSE;
91 }
92
93 static BOOL DLL_CALLCONV
SupportsICCProfiles()94 SupportsICCProfiles() {
95 return TRUE;
96 }
97
98 static BOOL DLL_CALLCONV
SupportsNoPixels()99 SupportsNoPixels() {
100 return FALSE;
101 }
102
103
104 // ----------------------------------------------------------
105
106 static void * DLL_CALLCONV
Open(FreeImageIO * io,fi_handle handle,BOOL read)107 Open(FreeImageIO *io, fi_handle handle, BOOL read) {
108 return NULL;
109 }
110
111 static void DLL_CALLCONV
Close(FreeImageIO * io,fi_handle handle,void * data)112 Close(FreeImageIO *io, fi_handle handle, void *data) {
113 }
114
115 static FIBITMAP * DLL_CALLCONV
Load(FreeImageIO * io,fi_handle handle,int page,int flags,void * data)116 Load(FreeImageIO *io, fi_handle handle, int page, int flags, void *data) {
117 long offset = MNG_SIGNATURE_SIZE; // move to skip first 8 bytes of signature
118
119 // check the signature (8 bytes)
120 if(Validate(io, handle) == FALSE) {
121 return NULL;
122 }
123
124 // parse chunks and decode a jng or mng bitmap
125 return mng_ReadChunks(s_format_id, io, handle, offset, flags);
126 }
127
128
129 // ==========================================================
130 // Init
131 // ==========================================================
132
133 void DLL_CALLCONV
InitMNG(Plugin * plugin,int format_id)134 InitMNG(Plugin *plugin, int format_id) {
135 s_format_id = format_id;
136
137 plugin->format_proc = Format;
138 plugin->description_proc = Description;
139 plugin->extension_proc = Extension;
140 plugin->regexpr_proc = RegExpr;
141 plugin->open_proc = Open;
142 plugin->close_proc = Close;
143 plugin->pagecount_proc = NULL;
144 plugin->pagecapability_proc = NULL;
145 plugin->load_proc = Load;
146 plugin->save_proc = NULL;
147 plugin->validate_proc = Validate;
148 plugin->mime_proc = MimeType;
149 plugin->supports_export_bpp_proc = SupportsExportDepth;
150 plugin->supports_export_type_proc = SupportsExportType;
151 plugin->supports_icc_profiles_proc = SupportsICCProfiles;
152 plugin->supports_no_pixels_proc = SupportsNoPixels;
153 }
154