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