AuroraMiddleware/qt5base-lts
1
0
Fork 0
Code Issues Pull Requests Packages Projects Releases Wiki Activity

Do not change depth for the backingstore's underlying image

Browse Source 
The depth cannot change. This means that RGB16 cannot be upgraded
to 8565 for example as that would be a 24 bit format whereas the
backingstores and the underlying platform may expect a 16 bit
format.

Task-number: QTBUG-50869
Change-Id: I648b39287d43a80fae8097a33bbf3b8bbdcb8816
Reviewed-by: Friedemann Kleint <Friedemann.Kleint@theqtcompany.com>
Reviewed-by: Andreas Holzammer <andreas.holzammer@kdab.com>
Reviewed-by: Allan Sandfeld Jensen <allan.jensen@theqtcompany.com>
This commit is contained in:
Laszlo Agocs 2016-02-04 10:15:59 +01:00 committed by Jani Heikkinen
parent cb6d4d1f16
commit d482805856
3 changed files with 8 additions and 2 deletions
Show Stats Download Patch File Download Diff File Expand all files Collapse all files

6
src/gui/image/qimage_p.h
View File

@ -189,6 +189,12 @@ inline QImage::Format qt_alphaVersion(QImage::Format format)
return QImage::Format_ARGB32_Premultiplied;
}
inline QImage::Format qt_maybeAlphaVersionWithSameDepth(QImage::Format format)
{
const QImage::Format toFormat = qt_alphaVersion(format);
return qt_depthForFormat(format) == qt_depthForFormat(toFormat) ? toFormat : format;
}
inline QImage::Format qt_alphaVersionForPainting(QImage::Format format)
{
QImage::Format toFormat = qt_alphaVersion(format);

2
src/plugins/platforms/windows/qwindowsbackingstore.cpp
View File

@ -155,7 +155,7 @@ void QWindowsBackingStore::resize(const QSize &size, const QRegion &region)
if (QImage::toPixelFormat(format).alphaUsage() == QPixelFormat::UsesAlpha)
m_alphaNeedsFill = true;
else // upgrade but here we know app painting does not rely on alpha hence no need to fill
format = qt_alphaVersionForPainting(format);
format = qt_maybeAlphaVersionWithSameDepth(format);
QWindowsNativeImage *oldwni = m_image.data();
QWindowsNativeImage *newwni = new QWindowsNativeImage(size.width(), size.height(), format);

2
src/plugins/platforms/xcb/qxcbbackingstore.cpp
View File

@ -179,7 +179,7 @@ QXcbShmImage::QXcbShmImage(QXcbScreen *screen, const QSize &size, uint depth, QI
m_hasAlpha = QImage::toPixelFormat(format).alphaUsage() == QPixelFormat::UsesAlpha;
if (!m_hasAlpha)
format = qt_alphaVersionForPainting(format);
format = qt_maybeAlphaVersionWithSameDepth(format);
m_qimage = QImage( (uchar*) m_xcb_image->data, m_xcb_image->width, m_xcb_image->height, m_xcb_image->stride, format);
m_graphics_buffer = new QXcbShmGraphicsBuffer(&m_qimage);