Differential D11064 Diff 28737 kcms/fonts/previewimageprovider.cpp

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kcms/fonts/previewimageprovider.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		#include <QApplication>
21		#include <QPalette>
22
23		#include "kxftconfig.h"
24		#include "previewimageprovider.h"
25		#include "previewrenderengine.h"
26
27		PreviewImageProvider::PreviewImageProvider(const QFont& font)
28		: QQuickImageProvider(QQuickImageProvider::Image)
29		, m_font(font)
30		{
31		}
32
33		QImage PreviewImageProvider::requestImage(const QString &id, QSize *size, const QSize &requestedSize)
34		{
35		int subPixelIndex = 0;
36		int hintingIndex = 0;
	broulikUnsubmitted Done avoid splitting twice, I suggest storing const auto sections = id.splitRef(QLatin1Char('_')); Also do a bounds check broulik: avoid splitting twice, I suggest storing ``` const auto sections = id.splitRef(QLatin1Char…
37
38		const auto sections = id.splitRef(QLatin1Char('_'));
39
40		if (sections.size() >= 2) {
41		subPixelIndex = sections[0].toInt();
42		hintingIndex = sections[1].toInt();
43		}
44
45		KXftConfig xft;
46
47
48		KXftConfig::AntiAliasing::State oldAntialiasing = xft.getAntiAliasing();
49		double oldStart,oldEnd;
50		xft.getExcludeRange(oldStart, oldEnd);
51		KXftConfig::SubPixel::Type oldSubPixelType;
52		xft.getSubPixelType(oldSubPixelType);
53		KXftConfig::Hint::Style oldHintStyle;
54		xft.getHintStyle(oldHintStyle);
55
56
57		xft.setAntiAliasing(KXftConfig::AntiAliasing::Enabled);
58		xft.setExcludeRange(0, 0);
59
60		KXftConfig::SubPixel::Type subPixelType = (KXftConfig::SubPixel::Type)subPixelIndex;
61		xft.setSubPixelType(subPixelType);
62
63		KXftConfig::Hint::Style hintStyle = (KXftConfig::Hint::Style)hintingIndex;
64		xft.setHintStyle(hintStyle);
65
66		xft.apply();
67
	broulikUnsubmitted Done Your image does not take into account `devicePixelRatio` which makes it blurred on my high dpi screen. I'm not sure how to exactly fix that, perhaps `@2x` works for the image provider, or you can manually implement this, to test run QT_SCREEN_SCALE_FACTORS=2 kcmshell5 kcm_fonts broulik: Your image does not take into account `devicePixelRatio` which makes it blurred on my high dpi…
68
69		QColor text(QApplication::palette().color(QPalette::Text));
70		QColor bgnd(QApplication::palette().color(QPalette::Window));
71
72		PreviewRenderEngine eng(true);
73		QImage img = eng.drawAutoSize(m_font, text, bgnd, eng.getDefaultPreviewString());
74
75
76		xft.setAntiAliasing(oldAntialiasing);
77		xft.setExcludeRange(oldStart, oldEnd);
78		xft.setSubPixelType(oldSubPixelType);
79		xft.setHintStyle(oldHintStyle);
80
81		*size = img.size();
82
83		return img;
84		}