kcms/fonts/previewrenderengine.cpp

0001 /*
0002     SPDX-FileCopyrightText: 2018 Julian Wolff <wolff@julianwolff.de>
0003
0004     SPDX-License-Identifier: LGPL-2.0-or-later
0005 */
0006
0007 #include "previewrenderengine.h"
0008 #include "Fc.h"
0009
0010 #include <QApplication>
0011 #include <QScreen>
0012 #if QT_VERSION >= QT_VERSION_CHECK(6, 0, 0)
0013 #include <private/qtx11extras_p.h>
0014 #else
0015 #include <QX11Info>
0016 #endif
0017
0018 #include <X11/Xft/Xft.h>
0019
0020 #ifdef HAVE_FONTCONFIG
0021
0022 static int qtToFcWeight(int weight)
0023 {
0024     switch (weight) {
0025     case 0:
0026         return FC_WEIGHT_THIN;
0027     case QFont::Light >> 1:
0028         return FC_WEIGHT_EXTRALIGHT;
0029     case QFont::Light:
0030         return FC_WEIGHT_LIGHT;
0031     default:
0032     case QFont::Normal:
0033         return FC_WEIGHT_REGULAR;
0034     case (QFont::Normal + QFont::DemiBold) >> 1:
0035 #ifdef KFI_HAVE_MEDIUM_WEIGHT
0036         return FC_WEIGHT_MEDIUM;
0037 #endif
0038     case QFont::DemiBold:
0039         return FC_WEIGHT_DEMIBOLD;
0040     case QFont::Bold:
0041         return FC_WEIGHT_BOLD;
0042     case (QFont::Bold + QFont::Black) >> 1:
0043         return FC_WEIGHT_EXTRABOLD;
0044     case QFont::Black:
0045         return FC_WEIGHT_BLACK;
0046     }
0047 }
0048
0049 #ifndef KFI_FC_NO_WIDTHS
0050 static int qtToFcWidth(int weight)
0051 {
0052     switch (weight) {
0053     case QFont::UltraCondensed:
0054         return KFI_FC_WIDTH_ULTRACONDENSED;
0055     case QFont::ExtraCondensed:
0056         return KFI_FC_WIDTH_EXTRACONDENSED;
0057     case QFont::Condensed:
0058         return KFI_FC_WIDTH_CONDENSED;
0059     case QFont::SemiCondensed:
0060         return KFI_FC_WIDTH_SEMICONDENSED;
0061     default:
0062     case QFont::Unstretched:
0063         return KFI_FC_WIDTH_NORMAL;
0064     case QFont::SemiExpanded:
0065         return KFI_FC_WIDTH_SEMIEXPANDED;
0066     case QFont::Expanded:
0067         return KFI_FC_WIDTH_EXPANDED;
0068     case QFont::ExtraExpanded:
0069         return KFI_FC_WIDTH_EXTRAEXPANDED;
0070     case QFont::UltraExpanded:
0071         return KFI_FC_WIDTH_ULTRAEXPANDED;
0072     }
0073 }
0074 #endif
0075
0076 static bool qtToFcSlant(int slant)
0077 {
0078     switch (slant) {
0079     default:
0080     case QFont::StyleNormal:
0081         return FC_SLANT_ROMAN;
0082     case QFont::StyleItalic:
0083         return FC_SLANT_ITALIC;
0084     case QFont::StyleOblique:
0085         return FC_SLANT_OBLIQUE;
0086     }
0087 }
0088
0089 static quint32 qtToFcStyle(const QFont &font)
0090 {
0091     return KFI::FC::createStyleVal(qtToFcWeight(font.weight()), qtToFcWidth(font.stretch()), qtToFcSlant(font.style()));
0092 }
0093
0094 PreviewRenderEngine::PreviewRenderEngine(bool init)
0095     : CFcEngine(init)
0096 {
0097     if (init)
0098         FcInitReinitialize();
0099 }
0100
0101 PreviewRenderEngine::~PreviewRenderEngine()
0102 {
0103 }
0104
0105 QImage PreviewRenderEngine::drawAutoSize(const QFont &font, const QColor &txt, const QColor &bgnd, const QString &text)
0106 {
0107     const QString &name = font.family();
0108     const quint32 style = qtToFcStyle(font);
0109     int faceNo = 0;
0110
0111     double ratio = QGuiApplication::primaryScreen()->devicePixelRatio();
0112     double dpi = QX11Info::appDpiY();
0113
0114     int fSize((int)(((font.pointSizeF() * dpi * ratio) / 72.0) + 0.5));
0115
0116     QImage image(draw(name, style, faceNo, txt, bgnd, fSize, text));
0117     image.setDevicePixelRatio(ratio);
0118     return image;
0119 }
0120
0121 #endif // HAVE_FONTCONFIG