Copy bug description https://bugreports.qt.io/browse/QTBUG-47547 and
paste here.
if developer specifies font family with Non-Regular style, potential risk to
encounter Chinese characters are missing in some cases .
E.g
import QtQuick 2.4
import QtQuick.Controls 1.3
ApplicationWindow {
visible: true
width: 1280
height: 800
Text {
anchors.centerIn: parent
text: "系统设置"
font.family: "Ubuntu"
font.pixelSize: 69;
font.weight: Font.Light
}
}
Regarding the code snippets above.
For Chinese characters, QFontDatabase will use fallback font family("Droid Sans
Fallback") with "Light" style when add font Glyph.
since QFontDatabase checks if default style(Regular) of fallback font family
"Droid Sans Fallback" is same as font style specified in qml(Font.Light). And
QFontDatabase::isSmoothlyScalable will return false in such a case, which
results in scene graph will
use QSGDefaultGlyphNode when createGlyphNode is called. Issue happens.
However If scene graph doesn't prefer NativeGlyphNode and create GlyphNode
based on Distance Field technique. It works fine.
https://drive.google.com/open?id=0B2H9ECPSSfqIMzhvU1hPUWNlWnc
Need to only check styleKey when foundry->styles == specified style
Will see feedback from Qt guys.
Thanks.
PS: more test cases and patch can be found on
https://bugreports.qt.io/browse/QTBUG-47547
Also I think we can override bool QBasicFontDatabase::fontsAlwaysScalable()
method in qlinuxfbfontdatabase.cpp under qtbase/src/plugins/platforms/ for
platform independent purpose.
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You received this bug notification because you are a member of Ubuntu
Touch seeded packages, which is subscribed to qtdeclarative-opensource-
src in Ubuntu.
https://bugs.launchpad.net/bugs/1475205
Title:
Random Chinese character missing with Ubuntu font
Status in Canonical System Image:
Confirmed
Status in qtdeclarative-opensource-src package in Ubuntu:
Confirmed
Status in ubuntu-font-family-sources package in Ubuntu:
Incomplete
Status in ubuntu-ui-toolkit package in Ubuntu:
Invalid
Bug description:
After applied 50 GU setting in image, we started seeing randomly
missing Chinese characters across scopes and apps header, not clipped
at the begin or end of string, sometimes in the middle.
STEPS:
1. Switch display language to zh_CN in system settings
2. Reboot the phone
EXPECTED:
I should see all header strings displayed properly.
ACTUAL:
Randomly missing character.
VERSIONS:
current build number: 51
device name: arale
channel: ubuntu-touch/rc-proposed/meizu.zh-proposed
last update: 2015-07-16 04:59:10
version version: 51
version ubuntu: 20150716
version device: 20150709-8965e37
version custom: 20150716-819-9-6
---------- update ----------
The problem of missing characters can be reproduced even on a desktop,
outside of the header, without importing Ubuntu.Components:
import QtQuick 2.0
Item {
width: 800
height: 600
Text {
anchors.centerIn: parent
text: "系统设置 one two"
font.family: "Ubuntu"
font.pixelSize: 69
font.weight: Font.Light
}
}
The problem only appears to occur with this specific combination of
font family, pixelSize and weight. Tim Peeters reproduced the problem
on vivid on a laptop without changing the default settings for the
language (LANGUAGE="en_US").
To manage notifications about this bug go to:
https://bugs.launchpad.net/canonical-devices-system-image/+bug/1475205/+subscriptions
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