30 ZOOM_LVL_MAX = ZOOM_LVL_OUT_8X, |
30 ZOOM_LVL_MAX = ZOOM_LVL_OUT_8X, |
31 }; |
31 }; |
32 |
32 |
33 extern ZoomLevel _saved_scrollpos_zoom; |
33 extern ZoomLevel _saved_scrollpos_zoom; |
34 |
34 |
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35 /** |
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36 * Scale by zoom level, usually shift left (when zoom > ZOOM_LVL_NORMAL) |
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37 * When shifting right, value is rounded up |
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38 * @param value value to shift |
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39 * @param zoom zoom level to shift to |
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40 * @return shifted value |
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41 */ |
35 static inline int ScaleByZoom(int value, ZoomLevel zoom) |
42 static inline int ScaleByZoom(int value, ZoomLevel zoom) |
36 { |
43 { |
37 if (zoom == ZOOM_LVL_NORMAL) return value; |
44 if (zoom == ZOOM_LVL_NORMAL) return value; |
38 int izoom = (int)zoom - (int)ZOOM_LVL_NORMAL; |
45 int izoom = (int)zoom - (int)ZOOM_LVL_NORMAL; |
39 return (zoom > ZOOM_LVL_NORMAL) ? value << izoom : (value + (1 << -izoom) - 1) >> -izoom; |
46 return (zoom > ZOOM_LVL_NORMAL) ? value << izoom : (value + (1 << -izoom) - 1) >> -izoom; |
40 } |
47 } |
41 |
48 |
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49 /** |
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50 * Scale by zoom level, usually shift right (when zoom > ZOOM_LVL_NORMAL) |
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51 * When shifting right, value is rounded up |
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52 * @param value value to shift |
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53 * @param zoom zoom level to shift to |
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54 * @return shifted value |
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55 */ |
42 static inline int UnScaleByZoom(int value, ZoomLevel zoom) |
56 static inline int UnScaleByZoom(int value, ZoomLevel zoom) |
43 { |
57 { |
44 if (zoom == ZOOM_LVL_NORMAL) return value; |
58 if (zoom == ZOOM_LVL_NORMAL) return value; |
45 int izoom = (int)zoom - (int)ZOOM_LVL_NORMAL; |
59 int izoom = (int)zoom - (int)ZOOM_LVL_NORMAL; |
46 return (zoom > ZOOM_LVL_NORMAL) ? (value + (1 << izoom) - 1) >> izoom : value << -izoom; |
60 return (zoom > ZOOM_LVL_NORMAL) ? (value + (1 << izoom) - 1) >> izoom : value << -izoom; |
47 } |
61 } |
48 |
62 |
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63 /** |
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64 * Scale by zoom level, usually shift left (when zoom > ZOOM_LVL_NORMAL) |
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65 * @param value value to shift |
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66 * @param zoom zoom level to shift to |
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67 * @return shifted value |
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68 */ |
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69 static inline int ScaleByZoomLower(int value, ZoomLevel zoom) |
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70 { |
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71 if (zoom == ZOOM_LVL_NORMAL) return value; |
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72 int izoom = (int)zoom - (int)ZOOM_LVL_NORMAL; |
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73 return (zoom > ZOOM_LVL_NORMAL) ? value << izoom : value >> -izoom; |
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74 } |
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75 |
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76 /** |
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77 * Scale by zoom level, usually shift right (when zoom > ZOOM_LVL_NORMAL) |
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78 * @param value value to shift |
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79 * @param zoom zoom level to shift to |
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80 * @return shifted value |
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81 */ |
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82 static inline int UnScaleByZoomLower(int value, ZoomLevel zoom) |
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83 { |
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84 if (zoom == ZOOM_LVL_NORMAL) return value; |
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85 int izoom = (int)zoom - (int)ZOOM_LVL_NORMAL; |
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86 return (zoom > ZOOM_LVL_NORMAL) ? value >> izoom : value << -izoom; |
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87 } |
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88 |
49 #endif /* ZOOM_HPP */ |
89 #endif /* ZOOM_HPP */ |