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annotate src/zoom.hpp @ 6653:cbe12394f776 draft

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(svn r9884) -Feature: 2 new zoom-out levels: 8 times and 16 times -Codechange: unified the blitter function so we have 1 function for all zoom-levels -Codechange: make most of the label functions work with zoom-level instead of magic numbers and big switches per zoom-level -Codechange: MakeXXXDirty() functions didn't take into account zoom-level, but just used the biggest possible value -Codechange: simplified blitter functions to avoid code duplication
author truelight <truelight@openttd.org>
date Sat, 19 May 2007 22:48:04 +0000
parents f358a236fcf4
children 245ee4529876
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1 /* $Id$ */
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2
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3 /** @file zoom.hpp */
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4
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5 #ifndef ZOOM_HPP
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6 #define ZOOM_HPP
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7
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8 enum ZoomLevel {
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9 /* Our possible zoom-levels */
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10 ZOOM_LVL_NORMAL = 0,
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11 ZOOM_LVL_OUT_2X,
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12 ZOOM_LVL_OUT_4X,
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13 ZOOM_LVL_OUT_8X,
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14 ZOOM_LVL_OUT_16X,
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15 ZOOM_LVL_END,
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16
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17 /* Here we define in which zoom viewports are */
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18 ZOOM_LVL_VIEWPORT = ZOOM_LVL_NORMAL,
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19 ZOOM_LVL_NEWS = ZOOM_LVL_NORMAL,
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20 ZOOM_LVL_INDUSTRY = ZOOM_LVL_OUT_2X,
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21 ZOOM_LVL_TOWN = ZOOM_LVL_OUT_2X,
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22 ZOOM_LVL_AIRCRAFT = ZOOM_LVL_NORMAL,
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23 ZOOM_LVL_SHIP = ZOOM_LVL_NORMAL,
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24 ZOOM_LVL_TRAIN = ZOOM_LVL_NORMAL,
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25 ZOOM_LVL_ROADVEH = ZOOM_LVL_NORMAL,
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26 ZOOM_LVL_WORLD_SCREENSHOT = ZOOM_LVL_NORMAL,
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27
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28 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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29
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30 ZOOM_LVL_MIN = ZOOM_LVL_NORMAL,
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31 ZOOM_LVL_MAX = ZOOM_LVL_OUT_16X,
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32 };
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33
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34 extern ZoomLevel _saved_scrollpos_zoom;
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35
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36 static inline int ScaleByZoom(int value, ZoomLevel zoom)
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37 {
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38 if (zoom == ZOOM_LVL_NORMAL) return value;
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39 int izoom = (int)zoom - (int)ZOOM_LVL_NORMAL;
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40 return (zoom > ZOOM_LVL_NORMAL) ? value << izoom : value >> izoom;
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41 }
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42
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43 static inline int UnScaleByZoom(int value, ZoomLevel zoom)
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44 {
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45 if (zoom == ZOOM_LVL_NORMAL) return value;
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46 int izoom = (int)zoom - (int)ZOOM_LVL_NORMAL;
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47 return (zoom > ZOOM_LVL_NORMAL) ? value >> izoom : value << izoom;
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48 }
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49
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50 #endif /* ZOOM_HPP */