path: root/src/gui
diff options
authorHolger Hans Peter Freyther <>2012-02-20 10:30:07 +0100
committerQt by Nokia <>2012-03-06 08:24:22 +0100
commite6f84312a5352c742f240385e2814ef9b865db22 (patch)
tree2167c4410cd692553a92aa9d1bbf9effb48005a3 /src/gui
parent4a80a7ced1f643a6794f6550d01c1fe60295a21c (diff)
qpa: Document a requirement of the backing store implementation
Docuent the requirement that the alpha channels need to be properly initialized by the implementation. Change-Id: I03db81b44b43ea75feb1b983fb0725c65a3bd9f4 Reviewed-by: Samuel Rødal <>
Diffstat (limited to 'src/gui')
1 files changed, 3 insertions, 0 deletions
diff --git a/src/gui/painting/qplatformbackingstore_qpa.cpp b/src/gui/painting/qplatformbackingstore_qpa.cpp
index 485190d301..ff7d91ccea 100644
--- a/src/gui/painting/qplatformbackingstore_qpa.cpp
+++ b/src/gui/painting/qplatformbackingstore_qpa.cpp
@@ -114,6 +114,9 @@ QWindow* QPlatformBackingStore::window() const
This function is called before painting onto the surface begins,
with the \a region in which the painting will occur.
+ \note A platform providing a backing store with an alpha channel
+ needs to properly initialize the region to be painted.
\sa endPaint(), paintDevice()