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Location: cpp/openttd-patchpack/source/src/zoom_func.h - annotation
r8912:e8149d34f9d5
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(svn r12682) -Fix [FS#1920]: removing road pieces from a town gave you twice the intended penalty.
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/** @file zoom_func.hpp */
#ifndef ZOOM_FUNC_H
#define ZOOM_FUNC_H
#include "zoom_type.h"
extern ZoomLevel _saved_scrollpos_zoom;
/**
* Scale by zoom level, usually shift left (when zoom > ZOOM_LVL_NORMAL)
* When shifting right, value is rounded up
* @param value value to shift
* @param zoom zoom level to shift to
* @return shifted value
*/
static inline int ScaleByZoom(int value, ZoomLevel zoom)
{
if (zoom == ZOOM_LVL_NORMAL) return value;
int izoom = zoom - ZOOM_LVL_NORMAL;
return (zoom > ZOOM_LVL_NORMAL) ? value << izoom : (value + (1 << -izoom) - 1) >> -izoom;
}
/**
* Scale by zoom level, usually shift right (when zoom > ZOOM_LVL_NORMAL)
* When shifting right, value is rounded up
* @param value value to shift
* @param zoom zoom level to shift to
* @return shifted value
*/
static inline int UnScaleByZoom(int value, ZoomLevel zoom)
{
if (zoom == ZOOM_LVL_NORMAL) return value;
int izoom = zoom - ZOOM_LVL_NORMAL;
return (zoom > ZOOM_LVL_NORMAL) ? (value + (1 << izoom) - 1) >> izoom : value << -izoom;
}
/**
* Scale by zoom level, usually shift left (when zoom > ZOOM_LVL_NORMAL)
* @param value value to shift
* @param zoom zoom level to shift to
* @return shifted value
*/
static inline int ScaleByZoomLower(int value, ZoomLevel zoom)
{
if (zoom == ZOOM_LVL_NORMAL) return value;
int izoom = zoom - ZOOM_LVL_NORMAL;
return (zoom > ZOOM_LVL_NORMAL) ? value << izoom : value >> -izoom;
}
/**
* Scale by zoom level, usually shift right (when zoom > ZOOM_LVL_NORMAL)
* @param value value to shift
* @param zoom zoom level to shift to
* @return shifted value
*/
static inline int UnScaleByZoomLower(int value, ZoomLevel zoom)
{
if (zoom == ZOOM_LVL_NORMAL) return value;
int izoom = zoom - ZOOM_LVL_NORMAL;
return (zoom > ZOOM_LVL_NORMAL) ? value >> izoom : value << -izoom;
}
#endif /* ZOOM_FUNC_H */
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