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Fix font sizes when X11 has a forced dpi setting

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On X11, the X resource system can override the physical DPI of
the screen for resolving font sizes etc. Correctly load the
setting and adjust the logicalDpi() accordingly.

Change-Id: Id60d03d1d214fb99e9de17a65976abd170bb7cca
Reviewed-by: Eskil Abrahamsen Blomfeldt <eskil.abrahamsen-blomfeldt@digia.com>
This commit is contained in:
Lars Knoll 2012-12-18 14:05:45 +01:00 committed by The Qt Project
parent e14dd5a65d
commit 3bf50a7db9
2 changed files with 46 additions and 0 deletions
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44
src/plugins/platforms/xcb/qxcbscreen.cpp
View File

@ -66,6 +66,7 @@ QXcbScreen::QXcbScreen(QXcbConnection *connection, xcb_screen_t *scr,
, m_orientation(Qt::PrimaryOrientation)
, m_number(number)
, m_refreshRate(60)
, m_forcedDpi(-1)
{
if (connection->hasXRandr())
xcb_randr_select_input(xcb_connection(), screen()->root, true);
@ -82,6 +83,9 @@ QXcbScreen::QXcbScreen(QXcbConnection *connection, xcb_screen_t *scr,
if (m_availableGeometry.isEmpty())
m_availableGeometry = QRect(QPoint(), m_virtualSize);
readXResources();
#ifdef Q_XCB_DEBUG
qDebug();
qDebug("Screen output %s of xcb screen %d:", m_outputName.toUtf8().constData(), m_number);
@ -243,6 +247,9 @@ QImage::Format QXcbScreen::format() const
QDpi QXcbScreen::logicalDpi() const
{
if (m_forcedDpi > 0)
return QDpi(m_forcedDpi, m_forcedDpi);
return QDpi(Q_MM_PER_INCH * m_virtualSize.width() / m_virtualSizeMillimeters.width(),
Q_MM_PER_INCH * m_virtualSize.height() / m_virtualSizeMillimeters.height());
}
@ -474,4 +481,41 @@ QPixmap QXcbScreen::grabWindow(WId window, int x, int y, int width, int height)
return result;
}
void QXcbScreen::readXResources()
{
int offset = 0;
QByteArray resources;
while(1) {
xcb_get_property_reply_t *reply =
xcb_get_property_reply(xcb_connection(),
xcb_get_property_unchecked(xcb_connection(), false, screen()->root,
XCB_ATOM_RESOURCE_MANAGER,
XCB_ATOM_STRING, offset/4, 8192), NULL);
bool more = false;
if (reply && reply->format == 8 && reply->type == XCB_ATOM_STRING) {
resources += QByteArray((const char *)xcb_get_property_value(reply), xcb_get_property_value_length(reply));
offset += xcb_get_property_value_length(reply);
more = reply->bytes_after != 0;
}
if (reply)
free(reply);
if (!more)
break;
}
QList<QByteArray> split = resources.split('\n');
for (int i = 0; i < split.size(); ++i) {
const QByteArray &r = split.at(i);
if (r.startsWith("Xft.dpi:\t")) {
bool ok;
int dpi = r.mid(sizeof("Xft.dpi:")).toInt(&ok);
if (ok)
m_forcedDpi = dpi;
break;
}
}
}
QT_END_NAMESPACE

2
src/plugins/platforms/xcb/qxcbscreen.h
View File

@ -96,6 +96,7 @@ public:
void updateGeometry(xcb_timestamp_t timestamp);
void updateRefreshRate();
void readXResources();
private:
xcb_screen_t *m_screen;
xcb_randr_crtc_t m_crtc;
@ -114,6 +115,7 @@ private:
QMap<xcb_visualid_t, xcb_visualtype_t> m_visuals;
QXcbCursor *m_cursor;
int m_refreshRate;
int m_forcedDpi;
};
QT_END_NAMESPACE