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Correct compositionMode documentation

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Most composition modes require an alpha-channel to be meaningful, but
not all, and there is no requirements of specific formats.

Change-Id: I11e930ccc07e9ff5df06dbda6745e4afb79f5e08
Reviewed-by: Leena Miettinen <riitta-leena.miettinen@qt.io>
Reviewed-by: Gunnar Sletta <gunnar@sletta.org>
This commit is contained in:
Allan Sandfeld Jensen 2016-04-27 11:53:16 +02:00 committed by Allan Sandfeld Jensen
parent ffd99e1d18
commit 3cae115d6d
1 changed files with 4 additions and 5 deletions
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9
src/gui/painting/qpainter.cpp
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@ -2182,11 +2182,10 @@ void QPainter::setBrushOrigin(const QPointF &p)
destination pixel in such a way that the alpha component of the destination pixel in such a way that the alpha component of the
source defines the translucency of the pixel. source defines the translucency of the pixel.
When the paint device is a QImage, the image format must be set to Several composition modes require an alpha channel in the source or
\l {QImage::Format}{Format_ARGB32_Premultiplied} or target images to have an effect. For optimal performance the
\l {QImage::Format}{Format_ARGB32} for the composition modes to have image format \l {QImage::Format}{Format_ARGB32_Premultiplied} is
any effect. For performance the premultiplied version is the preferred preferred.
format.
When a composition mode is set it applies to all painting When a composition mode is set it applies to all painting
operator, pens, brushes, gradients and pixmap/image drawing. operator, pens, brushes, gradients and pixmap/image drawing.