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-rw-r--r--doc/src/howtos/openvg.qdoc21
1 files changed, 19 insertions, 2 deletions
diff --git a/doc/src/howtos/openvg.qdoc b/doc/src/howtos/openvg.qdoc
index f70ed54..e448d9c 100644
--- a/doc/src/howtos/openvg.qdoc
+++ b/doc/src/howtos/openvg.qdoc
@@ -172,8 +172,25 @@
\endlist
The other members of QPainter::CompositionMode are not supported
- because OpenVG 1.1 does not have an equivalent in its \c VGBlendMode
- enumeration. Any attempt to set an unsupported mode will result in
+ unless the \c{VG_KHR_advanced_blending} extension is present,
+ in which case the following additional modes are supported:
+
+ \list
+ \o QPainter::CompositionMode_Overlay
+ \o QPainter::CompositionMode_ColorDodge
+ \o QPainter::CompositionMode_ColorBurn
+ \o QPainter::CompositionMode_HardLight
+ \o QPainter::CompositionMode_SoftLight
+ \o QPainter::CompositionMode_Difference
+ \o QPainter::CompositionMode_Exclusion
+ \o QPainter::CompositionMode_SourceOut
+ \o QPainter::CompositionMode_DestinationOut
+ \o QPainter::CompositionMode_SourceAtop
+ \o QPainter::CompositionMode_DestinationAtop
+ \o QPainter::CompositionMode_Xor
+ \endlist
+
+ Any attempt to set an unsupported mode will result in
the actual mode being set to QPainter::CompositionMode_SourceOver.
Client applications should avoid using unsupported modes.