+
−/* $Id$ */
+
−
+
−/** @file zoom.hpp */
+
−
+
−#ifndef ZOOM_HPP
+
−#define ZOOM_HPP
+
−
+
−enum ZoomLevel {
+
−	/* Our possible zoom-levels */
+
−	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;
+
−
+
−static inline int ScaleByZoom(int value, ZoomLevel zoom)
+
−{
+
−	if (zoom == ZOOM_LVL_NORMAL) return value;
+
−	int izoom = (int)zoom - (int)ZOOM_LVL_NORMAL;
+
−	return (zoom > ZOOM_LVL_NORMAL) ? value << izoom : (value + (1 << -izoom) - 1) >> -izoom;
+
−}
+
−
+
−static inline int UnScaleByZoom(int value, ZoomLevel zoom)
+
−{
+
−	if (zoom == ZOOM_LVL_NORMAL) return value;
+
−	int izoom = (int)zoom - (int)ZOOM_LVL_NORMAL;
+
−	return (zoom > ZOOM_LVL_NORMAL) ? (value + (1 << izoom) - 1) >> izoom : value << -izoom;
+
−}
+
−
+
−#endif /* ZOOM_HPP */