GRASS GIS 8 Programmer's Manual 8.3.2(2024)-exported
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gsget.h
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1#ifndef _GSGET_H
2#define _GSGET_H
3
4#include <grass/ogsf.h>
5
6#define GET_MAPATT1(buff, offset, att) \
7 att = (buff->ib ? (float)buff->ib[offset] \
8 : buff->sb ? (float)buff->sb[offset] \
9 : buff->cb ? (float)buff->cb[offset] \
10 : buff->fb ? (float)buff->fb[offset] \
11 : 0.0)
12
13#define GET_MAPATT2(buff, offset, att) \
14 att = (buff->ib ? (float)buff->ib[offset] \
15 : buff->sb ? (float)buff->sb[offset] \
16 : buff->cb ? (float)buff->cb[offset] \
17 : buff->fb ? (float)buff->fb[offset] \
18 : buff->k); \
19 if (buff->tfunc) \
20 att = (buff->tfunc)(att, offset);
21
22/* cast to float, otherwise doesn't seem to handle neg. values */
23
24#define SCALE_ATT(att, val, low, high) \
25 ((val) <= att->max_nz && (val) >= att->min_nz && att->range_nz \
26 ? (((val)-att->min_nz) / att->range_nz) * ((high) - (low)) + (low) \
27 : 0)
28
29#define GET_MAPATT(buff, offset, att) (get_mapatt(buff, offset, &(att)))
30
31#define BM_GET_BYOFFSET(bm, off) \
32 (bm ? BM_get(bm, (off % bm->cols), (off / bm->cols)) : 0)
33
34#define XYMAXPOS 0x3ff /* 1023 */
35#define ZMAXPOS 0x3ff /* 1023 */
36
37#define NXMASK 0xffe00000 /* top 11 bits */
38#define NYMASK 0x1ffc00 /* middle 11 bits of packed int */
39#define NZMASK 0x3ff /* lowest 10 bits */
40
41#define NZUP 0x000003ff
42
43/* Fetch Normal vector from packed int */
44/*
45 #define FNORM(i,nv) \
46 nv[X] = ((int)(((i) & NXMASK) >> 21) - XYMAXPOS)/(float)XYMAXPOS; \
47 nv[Y] = ((int)(((i) & NYMASK) >> 10) - XYMAXPOS)/(float)XYMAXPOS; \
48 nv[Z] = (int)((i) & NZMASK) * GS_global_exag()/(float)ZMAXPOS
49 */
50
51#define FNORM(i, nv) \
52 nv[X] = ((int)(((i)&NXMASK) >> 21) - XYMAXPOS) / (float)XYMAXPOS; \
53 nv[Y] = ((int)(((i)&NYMASK) >> 10) - XYMAXPOS) / (float)XYMAXPOS; \
54 nv[Z] = (int)((i)&NZMASK) / (float)ZMAXPOS
55
56/* Pack Normal vector into int */
57#define PNORM(i, nv) \
58 i = ((unsigned int)((nv[X] * XYMAXPOS) + XYMAXPOS) << 21) | \
59 ((unsigned int)((nv[Y] * XYMAXPOS) + XYMAXPOS) << 10) | \
60 (unsigned int)(nv[Z] * ZMAXPOS)
61
62#endif /* _GSGET_H */