Differential D11064 Diff 28817 kcms/fonts/previewrenderengine.cpp

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kcms/fonts/previewrenderengine.cpp

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1​/*
2​ Copyright (c) 2018 Julian Wolff <wolff@julianwolff.de>
3​
4​ This library is free software; you can redistribute it and/or
5​ modify it under the terms of the GNU Library General Public
6​ License as published by the Free Software Foundation; either
7​ version 2 of the License, or (at your option) any later version.
8​
9​ This library is distributed in the hope that it will be useful,
10​ but WITHOUT ANY WARRANTY; without even the implied warranty of
11​ MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the GNU
12​ Library General Public License for more details.
13​
14​ You should have received a copy of the GNU Library General Public License
15​ along with this library; see the file COPYING.LIB. If not, write to
16​ the Free Software Foundation, Inc., 51 Franklin Street, Fifth Floor,
17​ Boston, MA 02110-1301, USA.
18​*/
19​
20​
21​
22​#include "kxftconfig.h"
23​#include "previewrenderengine.h"
24​#include "Fc.h"
25​
26​#include <QApplication>
27​#include <QDesktopWidget>
28​#include <QX11Info>
29​
30​#include <X11/Xft/Xft.h>
31​
32​#ifdef HAVE_FONTCONFIG
33​
34​
35​static int qtToFcWeight(int weight)
36​{
37​ switch(weight)
38​ {
39​ case 0:
40​ return FC_WEIGHT_THIN;
41​ case QFont::Light>>1:
42​ return FC_WEIGHT_EXTRALIGHT;
43​ case QFont::Light:
44​ return FC_WEIGHT_LIGHT;
45​ default:
46​ case QFont::Normal:
47​ return FC_WEIGHT_REGULAR;
48​ case (QFont::Normal+QFont::DemiBold)>>1:
49​#ifdef KFI_HAVE_MEDIUM_WEIGHT
50​ return FC_WEIGHT_MEDIUM;
51​#endif
52​ case QFont::DemiBold:
53​ return FC_WEIGHT_DEMIBOLD;
54​ case QFont::Bold:
55​ return FC_WEIGHT_BOLD;
56​ case (QFont::Bold+QFont::Black)>>1:
57​ return FC_WEIGHT_EXTRABOLD;
58​ case QFont::Black:
59​ return FC_WEIGHT_BLACK;
60​ }
61​}
62​
63​#ifndef KFI_FC_NO_WIDTHS
64​static int qtToFcWidth(int weight)
65​{
66​ switch(weight)
67​ {
68​ case QFont::UltraCondensed:
69​ return KFI_FC_WIDTH_ULTRACONDENSED;
70​ case QFont::ExtraCondensed:
71​ return KFI_FC_WIDTH_EXTRACONDENSED;
72​ case QFont::Condensed:
73​ return KFI_FC_WIDTH_CONDENSED;
74​ case QFont::SemiCondensed:
75​ return KFI_FC_WIDTH_SEMICONDENSED;
76​ default:
77​ case QFont::Unstretched:
78​ return KFI_FC_WIDTH_NORMAL;
79​ case QFont::SemiExpanded:
80​ return KFI_FC_WIDTH_SEMIEXPANDED;
81​ case QFont::Expanded:
82​ return KFI_FC_WIDTH_EXPANDED;
83​ case QFont::ExtraExpanded:
84​ return KFI_FC_WIDTH_EXTRAEXPANDED;
85​ case QFont::UltraExpanded:
86​ return KFI_FC_WIDTH_ULTRAEXPANDED;
87​ }
88​}
89​#endif
90​
91​static bool qtToFcSlant(int slant)
92​{
93​ switch(slant)
94​ {
95​ default:
96​ case QFont::StyleNormal:
97​ return FC_SLANT_ROMAN;
98​ case QFont::StyleItalic:
99​ return FC_SLANT_ITALIC;
100​ case QFont::StyleOblique:
101​ return FC_SLANT_OBLIQUE;
102​ }
103​}
104​
105​static quint32 qtToFcStyle(const QFont &font)
106​{
107​ return KFI::FC::createStyleVal(
108​ qtToFcWeight(font.weight()),
109​ qtToFcWidth(font.stretch()),
110​ qtToFcSlant(font.style())
111​ );
112​}
113​
114​PreviewRenderEngine::PreviewRenderEngine(bool init)
115​ : CFcEngine(init)
116​{
117​ if(init)
118​ FcInitReinitialize();
119​}
120​
121​PreviewRenderEngine::~PreviewRenderEngine()
122​{
123​}
124​
125​QImage PreviewRenderEngine::drawAutoSize(const QFont &font, const QColor &txt, const QColor &bgnd, const QString &text)
126​{
127​ const QString& name = font.family();
128​ const quint32 style = qtToFcStyle(font);
129​ int faceNo = 0;
130​
131​ double ratio = QApplication::desktop()->screen()->devicePixelRatio();
132​ double dpi = QX11Info::appDpiY();
133​
134​ int fSize((int)(((font.pointSizeF()*dpi*ratio)/72.0)+0.5));
135​
136​ QImage image(draw(name, style, faceNo, txt, bgnd, fSize, text));
137​ image.setDevicePixelRatio(ratio);
davidedmundsonUnsubmitted
Done

change to

QImage image(draw(name, style,...));
image.setDevicePixelRatio(ratio);
return image;

This keeps the metadata of the image scaling with the image, and then the Image item knows automatically what the logical of this image is.

davidedmundson: change to QImage image(draw(name, style,...)); image.setDevicePixelRatio(ratio); return image…
progwolffAuthorUnsubmitted
Done

Thanks, this would be much cleaner. Sadly it doesn't seem to work.
I tried this before. Also tried setDotsPerMeterX.

The image is drawn too big with QT_SCREEN_SCALE_FACTORS=2:

progwolff: Thanks, this would be much cleaner. Sadly it doesn't seem to work. I tried this before. Also…
progwolffAuthorUnsubmitted
Done

It's a bug in Qt: https://bugreports.qt.io/browse/QTBUG-38127

Workaround: set the sourceSize to something.

progwolff: It's a bug in Qt: https://bugreports.qt.io/browse/QTBUG-38127 Workaround: set the sourceSize…
martUnsubmitted
Not Done

can you put the workaround with a giant comment that points to the qt bug?

mart: can you put the workaround with a giant comment that points to the qt bug?
138​ return image;
139​}
140​
141​#endif // HAVE_FONTCONFIG