9723
|
1 |
/* $Id$ */
|
|
2 |
|
10294
|
3 |
/** @file zoom_func.h */
|
9723
|
4 |
|
|
5 |
#ifndef ZOOM_FUNC_H
|
|
6 |
#define ZOOM_FUNC_H
|
|
7 |
|
|
8 |
#include "zoom_type.h"
|
|
9 |
|
|
10 |
extern ZoomLevel _saved_scrollpos_zoom;
|
|
11 |
|
|
12 |
/**
|
|
13 |
* Scale by zoom level, usually shift left (when zoom > ZOOM_LVL_NORMAL)
|
|
14 |
* When shifting right, value is rounded up
|
|
15 |
* @param value value to shift
|
|
16 |
* @param zoom zoom level to shift to
|
|
17 |
* @return shifted value
|
|
18 |
*/
|
|
19 |
static inline int ScaleByZoom(int value, ZoomLevel zoom)
|
|
20 |
{
|
|
21 |
if (zoom == ZOOM_LVL_NORMAL) return value;
|
|
22 |
int izoom = zoom - ZOOM_LVL_NORMAL;
|
|
23 |
return (zoom > ZOOM_LVL_NORMAL) ? value << izoom : (value + (1 << -izoom) - 1) >> -izoom;
|
|
24 |
}
|
|
25 |
|
|
26 |
/**
|
|
27 |
* Scale by zoom level, usually shift right (when zoom > ZOOM_LVL_NORMAL)
|
|
28 |
* When shifting right, value is rounded up
|
|
29 |
* @param value value to shift
|
|
30 |
* @param zoom zoom level to shift to
|
|
31 |
* @return shifted value
|
|
32 |
*/
|
|
33 |
static inline int UnScaleByZoom(int value, ZoomLevel zoom)
|
|
34 |
{
|
|
35 |
if (zoom == ZOOM_LVL_NORMAL) return value;
|
|
36 |
int izoom = zoom - ZOOM_LVL_NORMAL;
|
|
37 |
return (zoom > ZOOM_LVL_NORMAL) ? (value + (1 << izoom) - 1) >> izoom : value << -izoom;
|
|
38 |
}
|
|
39 |
|
|
40 |
/**
|
|
41 |
* Scale by zoom level, usually shift left (when zoom > ZOOM_LVL_NORMAL)
|
|
42 |
* @param value value to shift
|
|
43 |
* @param zoom zoom level to shift to
|
|
44 |
* @return shifted value
|
|
45 |
*/
|
|
46 |
static inline int ScaleByZoomLower(int value, ZoomLevel zoom)
|
|
47 |
{
|
|
48 |
if (zoom == ZOOM_LVL_NORMAL) return value;
|
|
49 |
int izoom = zoom - ZOOM_LVL_NORMAL;
|
|
50 |
return (zoom > ZOOM_LVL_NORMAL) ? value << izoom : value >> -izoom;
|
|
51 |
}
|
|
52 |
|
|
53 |
/**
|
|
54 |
* Scale by zoom level, usually shift right (when zoom > ZOOM_LVL_NORMAL)
|
|
55 |
* @param value value to shift
|
|
56 |
* @param zoom zoom level to shift to
|
|
57 |
* @return shifted value
|
|
58 |
*/
|
|
59 |
static inline int UnScaleByZoomLower(int value, ZoomLevel zoom)
|
|
60 |
{
|
|
61 |
if (zoom == ZOOM_LVL_NORMAL) return value;
|
|
62 |
int izoom = zoom - ZOOM_LVL_NORMAL;
|
|
63 |
return (zoom > ZOOM_LVL_NORMAL) ? value >> izoom : value << -izoom;
|
|
64 |
}
|
|
65 |
|
|
66 |
#endif /* ZOOM_FUNC_H */
|