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1 | /* rast.h - header file for Sun raster files | |
2 | ** | |
3 | ** The format of a Sun raster file is as follows. First, a struct | |
4 | ** rasterfile. Note the 32-bit magic number at the beginning; this | |
5 | ** identifies the file type and lets you figure out whether you need | |
6 | ** to do little-endian / big-endian byte-swapping or not. (The PBMPLUS | |
7 | ** implementation does not do byte-swapping; instead, it reads all | |
8 | ** multi-byte values a byte at a time.) | |
9 | ** | |
10 | ** After the struct is an optional colormap. If ras_maptype is RMT_NONE, | |
11 | ** no map is present; if it's RMT_EQUAL_RGB then the map consists of | |
12 | ** three unsigned-char arrays ras_maplength long, one each for r g and b. | |
13 | ** I don't know what RMT_RAW means. Black and white bitmaps are stored | |
14 | ** as ras_maptype == RMT_NONE and ras_depth == 1, with the bits stored | |
15 | ** eight to a byte MSB first. | |
16 | ** | |
17 | ** Finally comes the image data. If ras_type is RT_OLD or RT_STANDARD, | |
18 | ** the data is just plain old uncompressed bytes, padded out to a multiple | |
19 | ** of 16 bits in each row. If ras_type is RT_BYTE_ENCODED, a run-length | |
20 | ** compression scheme is used: an escape-byte of 128 indicates a run; | |
21 | ** the next byte is a count, and the one after that is the byte to be | |
22 | ** replicated. The one exception to this is if the count is 1; then | |
23 | ** there is no third byte in the packet, it means to put a single 128 | |
24 | ** in the data stream. | |
25 | */ | |
26 | ||
27 | #ifndef _RAST_H_ | |
28 | #define _RAST_H_ | |
29 | ||
30 | #define PIX_ERR -1 | |
31 | ||
32 | struct rasterfile { | |
33 | long ras_magic; | |
34 | #define RAS_MAGIC 0x59a66a95 | |
35 | long ras_width; | |
36 | long ras_height; | |
37 | long ras_depth; | |
38 | long ras_length; | |
39 | long ras_type; | |
40 | #define RT_OLD 0 /* Raw pixrect image in 68000 byte order */ | |
41 | #define RT_STANDARD 1 /* Raw pixrect image in 68000 byte order */ | |
42 | #define RT_BYTE_ENCODED 2 /* Run-length compression of bytes */ | |
43 | #define RT_FORMAT_RGB 3 /* XRGB or RGB instead of XBGR or BGR */ | |
44 | #define RT_FORMAT_TIFF 4 /* tiff <-> standard rasterfile */ | |
45 | #define RT_FORMAT_IFF 5 /* iff (TAAC format) <-> standard rasterfile */ | |
46 | #define RT_EXPERIMENTAL 0xffff /* Reserved for testing */ | |
47 | long ras_maptype; | |
48 | #define RMT_NONE 0 | |
49 | #define RMT_EQUAL_RGB 1 | |
50 | #define RMT_RAW 2 | |
51 | long ras_maplength; | |
52 | }; | |
53 | ||
54 | struct pixrectops { | |
55 | int (*pro_rop) (); | |
56 | int (*pro_stencil) (); | |
57 | int (*pro_batchrop) (); | |
58 | int (*pro_nop) (); | |
59 | int (*pro_destroy) (); | |
60 | int (*pro_get) (); | |
61 | int (*pro_put) (); | |
62 | int (*pro_vector) (); | |
63 | struct pixrect *(*pro_region) (); | |
64 | int (*pro_putcolormap) (); | |
65 | int (*pro_getcolormap) (); | |
66 | int (*pro_putattributes) (); | |
67 | int (*pro_getattributes) (); | |
68 | }; | |
69 | ||
70 | struct pr_size { | |
71 | int x, y; | |
72 | }; | |
73 | struct pr_pos { | |
74 | int x, y; | |
75 | }; | |
76 | ||
77 | struct pixrect { | |
78 | struct pixrectops *pr_ops; | |
79 | struct pr_size pr_size; | |
80 | int pr_depth; | |
81 | struct mpr_data *pr_data; /* work-alike only handles memory pixrects */ | |
82 | }; | |
83 | ||
84 | struct mpr_data { | |
85 | int md_linebytes; | |
86 | unsigned char *md_image; /* note, byte not short -- avoid pr_flip() */ | |
87 | struct pr_pos md_offset; | |
88 | short md_primary; | |
89 | short md_flags; | |
90 | }; | |
91 | ||
92 | typedef struct { | |
93 | int type; | |
94 | int length; | |
95 | unsigned char *map[3]; | |
96 | } colormap_t; | |
97 | ||
98 | /* And the routine definitions. */ | |
99 | ||
100 | struct pixrect *mem_create ARGS((int w, int h, int depth)); | |
101 | void mem_free ARGS((struct pixrect * p)); | |
102 | ||
103 | int pr_dump | |
104 | ARGS((struct pixrect * p, FILE * out, colormap_t * colormap, int type, int copy_flag)); | |
105 | ||
106 | int pr_load_header ARGS((FILE * in, struct rasterfile * hP)); | |
107 | ||
108 | int pr_load_colormap ARGS((FILE * in, struct rasterfile * hP, colormap_t * colormap)); | |
109 | ||
110 | struct pixrect *pr_load_image ARGS((FILE * in, struct rasterfile * hP, colormap_t * colormap)); | |
111 | ||
112 | #endif /*_RAST_H_*/ |