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zoom_func.h
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1 /* $Id: zoom_func.h 27417 2015-10-29 19:23:21Z frosch $ */
2
3 /*
4 * This file is part of OpenTTD.
5 * OpenTTD is free software; you can redistribute it and/or modify it under the terms of the GNU General Public License as published by the Free Software Foundation, version 2.
6 * OpenTTD is distributed in the hope that it will be useful, but WITHOUT ANY WARRANTY; without even the implied warranty of MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.
7 * See the GNU General Public License for more details. You should have received a copy of the GNU General Public License along with OpenTTD. If not, see <http://www.gnu.org/licenses/>.
8 */
9
12 #ifndef ZOOM_FUNC_H
13 #define ZOOM_FUNC_H
14
15 #include "zoom_type.h"
16
24 static inline int ScaleByZoom(int value, ZoomLevel zoom)
25 {
26 assert(zoom >= 0);
27 return value << zoom;
28 }
29
37 static inline int UnScaleByZoom(int value, ZoomLevel zoom)
38 {
39 assert(zoom >= 0);
40 return (value + (1 << zoom) - 1) >> zoom;
41 }
42
49 static inline int ScaleByZoomLower(int value, ZoomLevel zoom)
50 {
51 assert(zoom >= 0);
52 return value << zoom;
53 }
54
61 static inline int UnScaleByZoomLower(int value, ZoomLevel zoom)
62 {
63 assert(zoom >= 0);
64 return value >> zoom;
65 }
66
72 static inline int UnScaleGUI(int value)
73 {
74 return UnScaleByZoom(value, ZOOM_LVL_GUI);
75 }
76
82 static inline int ScaleGUITrad(int value)
83 {
84 return UnScaleGUI(value * ZOOM_LVL_BASE);
85 }
86
87 #endif /* ZOOM_FUNC_H */