truelight@6624: /* $Id$ */
truelight@6624: 
truelight@6624: /** @file zoom.hpp */
truelight@6624: 
truelight@6624: #ifndef ZOOM_HPP
truelight@6624: #define ZOOM_HPP
truelight@6624: 
truelight@6624: enum ZoomLevel {
truelight@6624: 	/* Our possible zoom-levels */
truelight@6624: 	ZOOM_LVL_NORMAL = 0,
truelight@6624: 	ZOOM_LVL_OUT_2X,
truelight@6624: 	ZOOM_LVL_OUT_4X,
truelight@6653: 	ZOOM_LVL_OUT_8X,
truelight@6624: 	ZOOM_LVL_END,
truelight@6624: 
truelight@6624: 	/* Here we define in which zoom viewports are */
truelight@6624: 	ZOOM_LVL_VIEWPORT = ZOOM_LVL_NORMAL,
truelight@6624: 	ZOOM_LVL_NEWS     = ZOOM_LVL_NORMAL,
truelight@6624: 	ZOOM_LVL_INDUSTRY = ZOOM_LVL_OUT_2X,
truelight@6624: 	ZOOM_LVL_TOWN     = ZOOM_LVL_OUT_2X,
truelight@6624: 	ZOOM_LVL_AIRCRAFT = ZOOM_LVL_NORMAL,
truelight@6624: 	ZOOM_LVL_SHIP     = ZOOM_LVL_NORMAL,
truelight@6624: 	ZOOM_LVL_TRAIN    = ZOOM_LVL_NORMAL,
truelight@6624: 	ZOOM_LVL_ROADVEH  = ZOOM_LVL_NORMAL,
truelight@6624: 	ZOOM_LVL_WORLD_SCREENSHOT = ZOOM_LVL_NORMAL,
truelight@6626: 
truelight@6852: 	ZOOM_LVL_DETAIL   = ZOOM_LVL_OUT_2X, ///< All zoomlevels below or equal to this, will result in details on the screen, like road-work, ...
truelight@6626: 
truelight@6626: 	ZOOM_LVL_MIN      = ZOOM_LVL_NORMAL,
truelight@6853: 	ZOOM_LVL_MAX      = ZOOM_LVL_OUT_8X,
truelight@6624: };
truelight@6624: 
truelight@6624: extern ZoomLevel _saved_scrollpos_zoom;
truelight@6624: 
truelight@6626: static inline int ScaleByZoom(int value, ZoomLevel zoom)
truelight@6626: {
truelight@6653: 	if (zoom == ZOOM_LVL_NORMAL) return value;
truelight@6626: 	int izoom = (int)zoom - (int)ZOOM_LVL_NORMAL;
truelight@6833: 	return (zoom > ZOOM_LVL_NORMAL) ? value << izoom : (value + (1 << -izoom) - 1) >> -izoom;
truelight@6626: }
truelight@6626: 
truelight@6626: static inline int UnScaleByZoom(int value, ZoomLevel zoom)
truelight@6626: {
truelight@6653: 	if (zoom == ZOOM_LVL_NORMAL) return value;
truelight@6626: 	int izoom = (int)zoom - (int)ZOOM_LVL_NORMAL;
truelight@6831: 	return (zoom > ZOOM_LVL_NORMAL) ? (value + (1 << izoom) - 1) >> izoom : value << -izoom;
truelight@6626: }
truelight@6626: 
truelight@6624: #endif /* ZOOM_HPP */