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rhi: Clarify the swapchain alpha flag docs

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Change-Id: Iff0edf0ae40b830af0209403d899def922e6088c
Reviewed-by: Christian Strømme <christian.stromme@qt.io>
This commit is contained in:
Laszlo Agocs 2019-09-11 09:50:57 +02:00
parent 6f592ea300
commit d39d1a9e67
1 changed files with 10 additions and 2 deletions
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12
src/gui/rhi/qrhi.cpp
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@ -3458,10 +3458,18 @@ QRhiResource::Type QRhiGraphicsPipeline::resourceType() const
Flag values to describe swapchain properties
\value SurfaceHasPreMulAlpha Indicates that the target surface has
transparency with premultiplied alpha.
transparency with premultiplied alpha. For example, this is what Qt Quick
uses when the alpha channel is enabled on the target QWindow, because the
scenegraph rendrerer always outputs fragments with alpha multiplied into
the red, green, and blue values. To ensure identical behavior across
platforms, always set QSurfaceFormat::alphaBufferSize() to a non-zero value
on the target QWindow whenever this flag is set on the swapchain.
\value SurfaceHasNonPreMulAlpha Indicates the target surface has
transparencyt with non-premultiplied alpha.
transparency with non-premultiplied alpha. Be aware that this may not be
supported on some systems, if the system compositor always expects content
with premultiplied alpha. In that case the behavior with this flag set is
expected to be equivalent to SurfaceHasPreMulAlpha.
\value sRGB Requests to pick an sRGB format for the swapchain and/or its
render target views, where applicable. Note that this implies that sRGB