daffodil.bmp.headers source code

1 module daffodil.bmp.headers;
2 
3 import daffodil.bmp;
4 import daffodil.util.headers;
5 
6 const BMP_FILE_HEADER = [0x42, 0x4D];
7 
8 struct BmpHeader {
9 @(Endianess.little):
10     uint size;
11     ushort reserved1;
12     ushort reserved2;
13     uint contentOffset;
14 }
15 
16 enum DibVersion {
17     CORE   = 12,
18     INFO   = 40,
19     V2INFO = 52,
20     V3INFO = 56,
21     V4     = 108,
22     V5     = 124,
23 }
24 
25 enum CompressionMethod {
26     RGB            = 0,
27     RLE8           = 1,
28     RLE4           = 2,
29     BITFIELDS      = 3,
30     JPEG           = 4,
31     PNG            = 5,
32     ALPHABITFIELDS = 6,
33     CMYK           = 11,
34     CMYKRLE8       = 12,
35     CMYKRLE4       = 13,
36 }
37 
38 /// Matches the typedefs found here: https://forums.adobe.com/servlet/JiveServlet/showImage/2-3273299-47801/BMP_Headers.png
39 struct DibHeader(DibVersion version_ = DibVersion.V5) {
40 @(Endianess.little):
41     // All versions
42     static if (version_ <= DibVersion.CORE) {
43         ushort width;
44         ushort height;
45     } else {
46         int width;
47         int height;
48     }
49     ushort planes;
50     ushort bitCount;
51 
52     static if (version_ >= DibVersion.INFO) {
53         uint compression;
54         uint dataSize;
55         int xPixelsPerMeter;
56         int yPixelsPerMeter;
57         uint colorsUsed;
58         uint colorsImportant;
59     }
60 
61     static if (version_ >= DibVersion.V2INFO) {
62         uint redMask;
63         uint greenMask;
64         uint blueMask;
65     }
66 
67     static if (version_ >= DibVersion.V3INFO) {
68         uint alphaMask;
69     }
70 
71     static if (version_ >= DibVersion.V4) {
72         uint csType;
73         // No idea what this is, but its 32 bits long
74         static struct Endpoints { long a; long b; long c; long d; int e; };
75         Endpoints endpoints;
76         uint gammaRed;
77         uint gammaGreen;
78         uint gammaBlue;
79     }
80 
81     static if (version_ >= DibVersion.V5) {
82         uint intent;
83         uint profileData;
84         uint profileSize;
85         uint reserved;
86     }
87 
88     mixin Upcast;
89 }
90 
91 struct DibColorMask(bool alpha = true) {
92 @(Endianess.little):
93     uint redMask;
94     uint greenMask;
95     uint blueMask;
96 
97     static if (alpha) {
98         uint alphaMask;
99     }
100 }