Initialize with OpenTTD 1.9.3

src/zoom_func.h

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+/* $Id$ */
+
+/*
+ * This file is part of OpenTTD.
+ * 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.
+ * 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.
+ * 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/>.
+ */
+
+/** @file zoom_func.h Functions related to zooming. */
+
+#ifndef ZOOM_FUNC_H
+#define ZOOM_FUNC_H
+
+#include "zoom_type.h"
+
+/**
+ * Scale by zoom level, usually shift left (when zoom > ZOOM_LVL_NORMAL)
+ * When shifting right, value is rounded up
+ * @param value value to shift
+ * @param zoom  zoom level to shift to
+ * @return shifted value
+ */
+static inline int ScaleByZoom(int value, ZoomLevel zoom)
+{
+	assert(zoom >= 0);
+	return value << zoom;
+}
+
+/**
+ * Scale by zoom level, usually shift right (when zoom > ZOOM_LVL_NORMAL)
+ * When shifting right, value is rounded up
+ * @param value value to shift
+ * @param zoom  zoom level to shift to
+ * @return shifted value
+ */
+static inline int UnScaleByZoom(int value, ZoomLevel zoom)
+{
+	assert(zoom >= 0);
+	return (value + (1 << zoom) - 1) >> zoom;
+}
+
+/**
+ * Scale by zoom level, usually shift left (when zoom > ZOOM_LVL_NORMAL)
+ * @param value value to shift
+ * @param zoom  zoom level to shift to
+ * @return shifted value
+ */
+static inline int ScaleByZoomLower(int value, ZoomLevel zoom)
+{
+	assert(zoom >= 0);
+	return value << zoom;
+}
+
+/**
+ * Scale by zoom level, usually shift right (when zoom > ZOOM_LVL_NORMAL)
+ * @param value value to shift
+ * @param zoom  zoom level to shift to
+ * @return shifted value
+ */
+static inline int UnScaleByZoomLower(int value, ZoomLevel zoom)
+{
+	assert(zoom >= 0);
+	return value >> zoom;
+}
+
+/**
+ * Short-hand to apply GUI zoom level.
+ * @param value Pixel amount at #ZOOM_LVL_BEGIN (full zoom in).
+ * @return Pixel amount at #ZOOM_LVL_GUI (current interface size).
+ */
+static inline int UnScaleGUI(int value)
+{
+	return UnScaleByZoom(value, ZOOM_LVL_GUI);
+}
+
+/**
+ * Scale traditional pixel dimensions to GUI zoom level.
+ * @param value Pixel amount at #ZOOM_LVL_BASE (traditional "normal" interface size).
+ * @return Pixel amount at #ZOOM_LVL_GUI (current interface size).
+ */
+static inline int ScaleGUITrad(int value)
+{
+	return UnScaleGUI(value * ZOOM_LVL_BASE);
+}
+
+/**
+ * Short-hand to apply font zoom level.
+ * @param value Pixel amount at #ZOOM_LVL_BEGIN (full zoom in).
+ * @return Pixel amount at #ZOOM_LVL_FONT (current interface size).
+ */
+static inline int UnScaleFont(int value)
+{
+	return UnScaleByZoom(value, ZOOM_LVL_FONT);
+}
+
+/**
+ * Scale traditional pixel dimensions to Font zoom level.
+ * @param value Pixel amount at #ZOOM_LVL_BASE (traditional "normal" interface size).
+ * @return Pixel amount at #ZOOM_LVL_FONT (current interface size).
+ */
+static inline int ScaleFontTrad(int value)
+{
+	return UnScaleFont(value * ZOOM_LVL_BASE);
+}
+
+#endif /* ZOOM_FUNC_H */