celestar@9911: /* $Id$ */
celestar@9911: 
celestar@9911: /** @file zoom.hpp */
celestar@9911: 
celestar@9911: #ifndef ZOOM_HPP
celestar@9911: #define ZOOM_HPP
celestar@9911: 
celestar@9911: enum ZoomLevel {
celestar@9911: 	/* Our possible zoom-levels */
celestar@9911: 	ZOOM_LVL_NORMAL = 0,
celestar@9911: 	ZOOM_LVL_OUT_2X,
celestar@9911: 	ZOOM_LVL_OUT_4X,
celestar@9911: 	ZOOM_LVL_OUT_8X,
celestar@9911: 	ZOOM_LVL_OUT_16X,
celestar@9911: 	ZOOM_LVL_END,
celestar@9911: 
celestar@9911: 	/* Here we define in which zoom viewports are */
celestar@9911: 	ZOOM_LVL_VIEWPORT = ZOOM_LVL_NORMAL,
celestar@9911: 	ZOOM_LVL_NEWS     = ZOOM_LVL_NORMAL,
celestar@9911: 	ZOOM_LVL_INDUSTRY = ZOOM_LVL_OUT_2X,
celestar@9911: 	ZOOM_LVL_TOWN     = ZOOM_LVL_OUT_2X,
celestar@9911: 	ZOOM_LVL_AIRCRAFT = ZOOM_LVL_NORMAL,
celestar@9911: 	ZOOM_LVL_SHIP     = ZOOM_LVL_NORMAL,
celestar@9911: 	ZOOM_LVL_TRAIN    = ZOOM_LVL_NORMAL,
celestar@9911: 	ZOOM_LVL_ROADVEH  = ZOOM_LVL_NORMAL,
celestar@9911: 	ZOOM_LVL_WORLD_SCREENSHOT = ZOOM_LVL_NORMAL,
celestar@9911: 
celestar@9911: 	ZOOM_LVL_DETAIL   = ZOOM_LVL_OUT_2X, //! All zoomlevels below or equal to this, will result in details on the screen, like road-work, ...
celestar@9911: 
celestar@9911: 	ZOOM_LVL_MIN      = ZOOM_LVL_NORMAL,
celestar@9911: 	ZOOM_LVL_MAX      = ZOOM_LVL_OUT_16X,
celestar@9911: };
celestar@9911: 
celestar@9911: extern ZoomLevel _saved_scrollpos_zoom;
celestar@9911: 
celestar@9911: static inline int ScaleByZoom(int value, ZoomLevel zoom)
celestar@9911: {
celestar@9911: 	if (zoom == ZOOM_LVL_NORMAL) return value;
celestar@9911: 	int izoom = (int)zoom - (int)ZOOM_LVL_NORMAL;
celestar@9911: 	return (zoom > ZOOM_LVL_NORMAL) ? value << izoom : value >> izoom;
celestar@9911: }
celestar@9911: 
celestar@9911: static inline int UnScaleByZoom(int value, ZoomLevel zoom)
celestar@9911: {
celestar@9911: 	if (zoom == ZOOM_LVL_NORMAL) return value;
celestar@9911: 	int izoom = (int)zoom - (int)ZOOM_LVL_NORMAL;
celestar@9911: 	return (zoom > ZOOM_LVL_NORMAL) ? value >> izoom : value << izoom;
celestar@9911: }
celestar@9911: 
celestar@9911: #endif /* ZOOM_HPP */