diff options
author | Chris Colbert <sccolbert@gmail.com> | 2013-11-18 21:49:21 -0500 |
---|---|---|
committer | The Qt Project <gerrit-noreply@qt-project.org> | 2013-11-25 07:52:44 +0100 |
commit | ab76593f18396e693f24066592244ca95e135ea2 (patch) | |
tree | c4f040413fbf3a62830903741d85f25820b7e4f1 /src/plugins/platforms/windows/qwindowsbackingstore.cpp | |
parent | 7b6253efbf28b43c8b2a561c188670466ac3d916 (diff) |
Fix the ignored Qt::WA_StaticContents on Windows
This restores the ability from the Qt 4.x series to honor the static
contents region in the backbuffer when resizing a widget. The fix
only applies when running under Windows.
Task-number: QTBUG-34799
[ChangeLog][QtWidgets][Windows] Update QWidgetBackingStore and QWindowsBackingStore to support Qt::WA_StaticContents
QWidgetBackingStore::staticContents() was updated for windows to *not* unconditionally return false. It now
returns true if it has a non-empty static widgets list. QWindowsBackingStore::resize(...) was updated to honor
the provided static contents region. It now copies the static region into the new backbuffer in a manner similar
to what was done in Qt4. The difference is that this version accounts for the possibility of the new buffer having
a smaller region than the old buffer. In Qt4 the ::prepareBuffer method was only called when the buffer was resized
larger.
Change-Id: I135ff8fb16f52759089f1e7353426303c4504db3
Reviewed-by: Gunnar Sletta <gunnar.sletta@digia.com>
Diffstat (limited to 'src/plugins/platforms/windows/qwindowsbackingstore.cpp')
-rw-r--r-- | src/plugins/platforms/windows/qwindowsbackingstore.cpp | 18 |
1 files changed, 17 insertions, 1 deletions
diff --git a/src/plugins/platforms/windows/qwindowsbackingstore.cpp b/src/plugins/platforms/windows/qwindowsbackingstore.cpp index 26205eb146..55e7b85d96 100644 --- a/src/plugins/platforms/windows/qwindowsbackingstore.cpp +++ b/src/plugins/platforms/windows/qwindowsbackingstore.cpp @@ -149,7 +149,23 @@ void QWindowsBackingStore::resize(const QSize &size, const QRegion ®ion) QImage::Format format = QWindowsNativeImage::systemFormat(); if (format == QImage::Format_RGB32 && rasterWindow()->window()->format().hasAlpha()) format = QImage::Format_ARGB32_Premultiplied; - m_image.reset(new QWindowsNativeImage(size.width(), size.height(), format)); + + QWindowsNativeImage *oldwni = m_image.data(); + QWindowsNativeImage *newwni = new QWindowsNativeImage(size.width(), size.height(), format); + + if (oldwni && !region.isEmpty()) { + const QImage &oldimg(oldwni->image()); + QImage &newimg(newwni->image()); + QRegion staticRegion(region); + staticRegion &= QRect(0, 0, oldimg.width(), oldimg.height()); + staticRegion &= QRect(0, 0, newimg.width(), newimg.height()); + QPainter painter(&newimg); + painter.setCompositionMode(QPainter::CompositionMode_Source); + foreach (const QRect &rect, staticRegion.rects()) + painter.drawImage(rect, oldimg, rect); + } + + m_image.reset(newwni); } } |