mirror of https://github.com/OpenTTD/OpenTTD.git
123 lines
3.5 KiB
C++
123 lines
3.5 KiB
C++
/*
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* This file is part of OpenTTD.
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* OpenTTD is free software; you can redistribute it and/or modify it under the terms of the GNU General Public License as published by the Free Software Foundation, version 2.
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* OpenTTD is distributed in the hope that it will be useful, but WITHOUT ANY WARRANTY; without even the implied warranty of MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.
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* See the GNU General Public License for more details. You should have received a copy of the GNU General Public License along with OpenTTD. If not, see <http://www.gnu.org/licenses/>.
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*/
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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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/**
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* Scale by zoom level, usually shift left (when zoom > ZOOM_LVL_MIN)
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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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inline int ScaleByZoom(int value, ZoomLevel zoom)
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{
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return value << zoom;
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}
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/**
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* Scale by zoom level, usually shift right (when zoom > ZOOM_LVL_MIN)
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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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inline int UnScaleByZoom(int value, ZoomLevel zoom)
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{
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return (value + (1 << zoom) - 1) >> zoom;
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}
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/**
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* Adjust by zoom level; zoom < 0 shifts right, zoom >= 0 shifts left
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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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inline int AdjustByZoom(int value, int zoom)
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{
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return zoom < 0 ? UnScaleByZoom(value, ZoomLevel(-zoom)) : ScaleByZoom(value, ZoomLevel(zoom));
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}
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/**
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* Scale by zoom level, usually shift left (when zoom > ZOOM_LVL_MIN)
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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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inline int ScaleByZoomLower(int value, ZoomLevel zoom)
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{
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return value << zoom;
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}
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/**
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* Scale by zoom level, usually shift right (when zoom > ZOOM_LVL_MIN)
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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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inline int UnScaleByZoomLower(int value, ZoomLevel zoom)
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{
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return value >> zoom;
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}
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/**
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* Short-hand to apply GUI zoom level.
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* @param value Pixel amount at #ZOOM_LVL_MIN (full zoom in).
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* @return Pixel amount at #ZOOM_LVL_GUI (current interface size).
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*/
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inline int UnScaleGUI(int value)
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{
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return UnScaleByZoom(value, ZOOM_LVL_GUI);
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}
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/**
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* Scale zoom level relative to GUI zoom.
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* @param value zoom level to scale
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* @return scaled zoom level
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*/
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inline ZoomLevel ScaleZoomGUI(ZoomLevel value)
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{
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return std::clamp(ZoomLevel(value + (ZOOM_LVL_GUI - ZOOM_LVL_NORMAL)), ZOOM_LVL_MIN, ZOOM_LVL_MAX);
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}
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/**
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* UnScale zoom level relative to GUI zoom.
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* @param value zoom level to scale
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* @return un-scaled zoom level
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*/
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inline ZoomLevel UnScaleZoomGUI(ZoomLevel value)
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{
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return std::clamp(ZoomLevel(value - (ZOOM_LVL_GUI - ZOOM_LVL_NORMAL)), ZOOM_LVL_MIN, ZOOM_LVL_MAX);
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}
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/**
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* Scale traditional pixel dimensions to GUI zoom level, for drawing sprites.
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* @param value Pixel amount at #ZOOM_BASE (traditional "normal" interface size).
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* @return Pixel amount at #ZOOM_LVL_GUI (current interface size).
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*/
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inline int ScaleSpriteTrad(int value)
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{
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return UnScaleGUI(value * ZOOM_BASE);
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}
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/**
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* Scale traditional pixel dimensions to GUI zoom level.
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* @param value Pixel amount at #ZOOM_BASE (traditional "normal" interface size).
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* @return Pixel amount at #ZOOM_LVL_GUI (current interface size).
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*/
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inline int ScaleGUITrad(int value)
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{
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return value * _gui_scale / 100;
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}
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#endif /* ZOOM_FUNC_H */
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