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client: Flush painting on subsurfaces

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When native widgets are nested in Qt, they act like independent windows
with a shared backing store. The toplevel window gets multiple flush
events with an argument for the window sub-content.

In wayland we need a unique backing store, so this code copies the
relevant contents into a new buffer and attaches it to the
subsurface.

Task-number: QTBUG-128029
Pick-to: 6.8
Change-Id: I865cb271d694d8190a444eb5a98378cd6a30634d
Reviewed-by: David Redondo <qt@david-redondo.de>
This commit is contained in:
David Edmundson 2024-08-29 09:37:41 +02:00
parent 193b7f011f
commit 2d5c66b79c
1 changed files with 11 additions and 4 deletions
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15
src/plugins/platforms/wayland/qwaylandshmbackingstore.cpp
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@ -208,16 +208,23 @@ void QWaylandShmBackingStore::endPaint()
void QWaylandShmBackingStore::flush(QWindow *window, const QRegion &region, const QPoint &offset)
{
Q_UNUSED(offset)
// Invoked when the window is of type RasterSurface or when the window is
// RasterGLSurface and there are no child widgets requiring OpenGL composition.
// For the case of RasterGLSurface + having to compose, the composeAndFlush() is
// called instead. The default implementation from QPlatformBackingStore is sufficient
// however so no need to reimplement that.
Q_UNUSED(window);
Q_UNUSED(offset);
if (window != this->window()) {
auto waylandWindow = static_cast<QWaylandWindow *>(window->handle());
auto newBuffer = new QWaylandShmBuffer(mDisplay, window->size(), mBackBuffer->image()->format(), mBackBuffer->scale());
newBuffer->setDeleteOnRelease(true);
QRect sourceRect(window->position(), window->size());
QPainter painter(newBuffer->image());
painter.drawImage(QPoint(0, 0), *mBackBuffer->image(), sourceRect);
waylandWindow->safeCommit(newBuffer, region);
return;
}
if (mPainting) {
mPendingRegion |= region;