| 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_*/ |