| author | truebrain |
| Sun, 07 Dec 2008 12:41:20 +0000 | |
| changeset 10410 | 4800ced41f84 |
| parent 9111 | 48ce04029fe4 |
| permissions | -rw-r--r-- |
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/* $Id$ */ |
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/** @file zoom_func.h Functions related to zooming. */ |
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#ifndef ZOOM_FUNC_H |
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#define ZOOM_FUNC_H |
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#include "zoom_type.h" |
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extern ZoomLevel _saved_scrollpos_zoom; |
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/** |
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* Scale by zoom level, usually shift left (when zoom > ZOOM_LVL_NORMAL) |
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* When shifting right, value is rounded up |
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* @param value value to shift |
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* @param zoom zoom level to shift to |
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* @return shifted value |
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*/ |
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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 = zoom - 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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/** |
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* Scale by zoom level, usually shift right (when zoom > ZOOM_LVL_NORMAL) |
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* When shifting right, value is rounded up |
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* @param value value to shift |
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* @param zoom zoom level to shift to |
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* @return shifted value |
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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 = zoom - 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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/** |
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* Scale by zoom level, usually shift left (when zoom > ZOOM_LVL_NORMAL) |
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ce31d2843a95
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* @param value value to shift |
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* @param zoom zoom level to shift to |
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* @return shifted value |
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*/ |
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static inline int ScaleByZoomLower(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 = zoom - ZOOM_LVL_NORMAL; |
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return (zoom > ZOOM_LVL_NORMAL) ? value << izoom : value >> -izoom; |
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} |
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/** |
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* Scale by zoom level, usually shift right (when zoom > ZOOM_LVL_NORMAL) |
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* @param value value to shift |
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* @param zoom zoom level to shift to |
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* @return shifted value |
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*/ |
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static inline int UnScaleByZoomLower(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 = zoom - ZOOM_LVL_NORMAL; |
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return (zoom > ZOOM_LVL_NORMAL) ? value >> izoom : value << -izoom; |
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} |
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#endif /* ZOOM_FUNC_H */ |