ppc.backend.loaders.image.pti source code

1 /**
2 Copyright (c) 2018 Clipsey (clipseypone@gmail.com)
3 
4 Permission is hereby granted, free of charge, to any person or organization
5 obtaining a copy of the software and accompanying documentation covered by
6 this license (the "Software") to use, reproduce, display, distribute,
7 execute, and transmit the Software, and to prepare derivative works of the
8 Software, and to permit third-parties to whom the Software is furnished to
9 do so, all subject to the following:
10 
11 The copyright notices in the Software and this entire statement, including
12 the above license grant, this restriction and the following disclaimer,
13 must be included in all copies of the Software, in whole or in part, and
14 all derivative works of the Software, unless such copies or derivative
15 works are solely in the form of machine-executable object code generated by
16 a source language processor.
17 
18 THE SOFTWARE IS PROVIDED "AS IS", WITHOUT WARRANTY OF ANY KIND, EXPRESS OR
19 IMPLIED, INCLUDING BUT NOT LIMITED TO THE WARRANTIES OF MERCHANTABILITY,
20 FITNESS FOR A PARTICULAR PURPOSE, TITLE AND NON-INFRINGEMENT. IN NO EVENT
21 SHALL THE COPYRIGHT HOLDERS OR ANYONE DISTRIBUTING THE SOFTWARE BE LIABLE
22 FOR ANY DAMAGES OR OTHER LIABILITY, WHETHER IN CONTRACT, TORT OR OTHERWISE,
23 ARISING FROM, OUT OF OR IN CONNECTION WITH THE SOFTWARE OR THE USE OR OTHER
24 DEALINGS IN THE SOFTWARE.
25 */
26 module ppc.backend.loaders.image.pti;
27 import ppc.backend.cfile;
28 import ppc.backend.signatures;
29 import ppc.types.image;
30 /**
31     Polyplex Tagged Image Format
32     A lossless image format with tags.
33 */
34 
35 /**
36     Loads an PTI image from memory.
37 */
38 void loadPTI(MemFile file, Image* oimg) {
39     uint width;
40     uint height;
41     uint tagMapLength;
42     ColorFormat colorFormat;
43     ubyte[] header = new ubyte[WritableFileSigs.ImagePTI.length];
44 
45     (*oimg).info.imageType = ImageType.PTI;
46 
47     // Check that this is actually an PTI file.
48     file.read(header.ptr, ubyte.sizeof, WritableFileSigs.ImagePTI.length, &file);
49     if (header != WritableFileSigs.ImagePTI) throw new Exception("Invalid PTI texture file! (header mismatch)");
50 
51     // Read width/height and prepare pixel data
52     file.read(&width, uint.sizeof, 1, &file);
53     file.read(&height, uint.sizeof, 1, &file);
54 
55     // Read color format
56     file.read(&colorFormat, ColorFormat.sizeof, 1, &file);
57 
58     // TODO: Use tagMap.
59     // skips the tag map for now
60     file.read(&tagMapLength, uint.sizeof, 1, &file);
61     file.seek(&file, tagMapLength, SeekCurrent);
62 
63     size_t cur = cast(size_t)file.tell(&file);
64     (*oimg).pixelData = new ubyte[file.length - cur];
65 
66     // Read pixel data
67     file.read(oimg.pixelData.ptr, ubyte.sizeof, oimg.pixelData.length, &file);
68 
69     // Set image info
70     (*oimg).info.colorFormat = colorFormat;
71     (*oimg).info.width = width;
72     (*oimg).info.height = height;
73 }
74 
75 /**
76     Loads an PTI image from memory.
77 */
78 Image loadPTI(MemFile file) {
79     Image oimg;
80     loadPTI(file, &oimg);
81     return oimg;
82 }
83 
84 import std.stdio;
85 /// Returns a writable PTI as a ubyte array
86 ubyte[] savePTI(Image img) {
87     uint tagMapLength = 0;
88     MemFile mf;
89 
90     // Write file header
91     mf.write(WritableFileSigs.ImagePTI.ptr, ubyte.sizeof, WritableFileSigs.ImagePTI.length, &mf);
92 
93     // Set data in a known byte-size
94     uint width = cast(uint)img.width;
95     uint height = cast(uint)img.height;
96 
97     // Set image info
98     mf.write(&width, uint.sizeof, 1, &mf);
99     mf.write(&height, uint.sizeof, 1, &mf);
100     mf.write(&img.info.colorFormat, ColorFormat.sizeof, 1, &mf);
101 
102     // TODO: implement image tags
103     mf.write(&tagMapLength, uint.sizeof, 1, &mf);
104 
105     // Write raw pixel data.
106     mf.write(img.pixelData.ptr, ubyte.sizeof, img.pixelData.length, &mf);
107 
108     return mf.toArray;
109 }