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/* $Id$ */
/** @file zoom.hpp */
#ifndef ZOOM_HPP
#define ZOOM_HPP
#include "core/enum_type.hpp"
enum ZoomLevel {
/* Our possible zoom-levels */
ZOOM_LVL_BEGIN = 0,
ZOOM_LVL_NORMAL = 0,
ZOOM_LVL_OUT_2X,
ZOOM_LVL_OUT_4X,
ZOOM_LVL_OUT_8X,
ZOOM_LVL_END,
/* Here we define in which zoom viewports are */
ZOOM_LVL_VIEWPORT = ZOOM_LVL_NORMAL,
ZOOM_LVL_NEWS = ZOOM_LVL_NORMAL,
ZOOM_LVL_INDUSTRY = ZOOM_LVL_OUT_2X,
ZOOM_LVL_TOWN = ZOOM_LVL_OUT_2X,
ZOOM_LVL_AIRCRAFT = ZOOM_LVL_NORMAL,
ZOOM_LVL_SHIP = ZOOM_LVL_NORMAL,
ZOOM_LVL_TRAIN = ZOOM_LVL_NORMAL,
ZOOM_LVL_ROADVEH = ZOOM_LVL_NORMAL,
ZOOM_LVL_WORLD_SCREENSHOT = ZOOM_LVL_NORMAL,
ZOOM_LVL_DETAIL = ZOOM_LVL_OUT_2X, ///< All zoomlevels below or equal to this, will result in details on the screen, like road-work, ...
ZOOM_LVL_MIN = ZOOM_LVL_NORMAL,
ZOOM_LVL_MAX = ZOOM_LVL_OUT_8X,
};
extern ZoomLevel _saved_scrollpos_zoom;
DECLARE_POSTFIX_INCREMENT(ZoomLevel)
/**
* 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_HPP */
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