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Compensate for global scale factor when using xcb fb plugin

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The screen geometry is reported in device independent pixels, so it has
to be multiplied by the devicePixelRatio to get the size of the underlying
framebuffer. Otherwise, only the top left of the screen will be captured.

This matches the behavior of QScreen::grabWindow(...), which also
returns a QPixmap of the given size scaled by devicePixelRatio.

BUG: 419814
This commit is contained in:
Stefan Brüns
2020-08-13 09:30:06 +02:00
committed by Alexey Min
parent 740f5c1449
commit 024ce87b3a
1 changed files with 5 additions and 2 deletions
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7
framebuffers/xcb/xcb_framebuffer.cpp
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@@ -163,11 +163,14 @@ XCBFrameBuffer::XCBFrameBuffer(WId winid, QObject *parent):
QScreen *primaryScreen = QGuiApplication::primaryScreen();
if (primaryScreen) {
qreal scaleFactor = primaryScreen->devicePixelRatio();
d->area = { primaryScreen->geometry().topLeft() * scaleFactor,
primaryScreen->geometry().bottomRight() * scaleFactor };
qDebug() << "xcb framebuffer: Primary screen: " << primaryScreen->name()
<< ", geometry: " << primaryScreen->geometry()
<< ", device scaling: " << scaleFactor
<< ", native size: " << d->area
<< ", depth: " << primaryScreen->depth();
//
d->area = primaryScreen->geometry();
} else {
qWarning() << "xcb framebuffer: ERROR: Failed to get application's primary screen info!";
return;