File indexing completed on 2024-07-21 03:46:58

0001 /*
0002     SPDX-FileCopyrightText: 2005, 2009 Albert Astals Cid <aacid@kde.org>
0003 
0004     SPDX-License-Identifier: LGPL-2.1-only OR LGPL-3.0-only OR LicenseRef-KDE-Accepted-LGPL
0005 */
0006 
0007 #include "kfontutils.h"
0008 
0009 // own
0010 #include "kfourinline_debug.h"
0011 // Qt
0012 #include <QFont>
0013 // Std
0014 #include <limits>
0015 
0016 qreal KFontUtils::adaptFontSize(QGraphicsTextItem *string, qreal width, qreal height, qreal maxFontSize, qreal minFontSize, qreal precision)
0017 {
0018     qreal size = maxFontSize;
0019     QRectF boundingRect;
0020     // Guard for avoiding possible infinite loop
0021     qreal lowerBound = 0;
0022     qreal higherBound = std::numeric_limits<double>::max();
0023     int count = 0;
0024 
0025     // Loop until found a point size that makes the text fit in the rectangle but
0026     // don't have more than precision pixels of unused space in any axys.
0027     while (count < 20) {
0028         QFont f = string->font();
0029         f.setPointSizeF(size);
0030         string->setFont(f);
0031         string->setTextWidth(width);
0032         boundingRect = string->boundingRect();
0033         // Error painting the text, return -1
0034         if (boundingRect.width() == 0 || boundingRect.height() == 0) {
0035             return -1;
0036         }
0037         // Text doesn't fit in rectangle or has too much unused space, adjust size
0038         else if (boundingRect.height() > height || boundingRect.height() < height - precision) {
0039             if (boundingRect.width() > width || boundingRect.height() > height)
0040                 higherBound = qMin(higherBound, size);
0041             else
0042                 lowerBound = qMax(lowerBound, size);
0043 
0044             if (lowerBound > 0 && higherBound < std::numeric_limits<double>::max()) {
0045                 size = (lowerBound + higherBound) / 2;
0046             } else {
0047                 size = (height / boundingRect.height()) * size;
0048             }
0049 
0050             count++;
0051         }
0052         // Text fits correctly
0053         else {
0054             break;
0055         }
0056     }
0057 
0058     // Assure to return a value between minimum and maximum values.
0059     if (size < minFontSize)
0060         return minFontSize;
0061     else if (size > maxFontSize)
0062         return maxFontSize;
0063     else
0064         return size;
0065 }
0066 
0067 qreal KFontUtils::adaptFontSize(QGraphicsTextItem *text, const QSizeF &availableSize, qreal maxFontSize, qreal minFontSize, qreal precision)
0068 {
0069     return adaptFontSize(text, availableSize.width(), availableSize.height(), maxFontSize, minFontSize, precision);
0070 }