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clatify alpha discussion (closes #10888)

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git-svn-id: https://svn.wxwidgets.org/svn/wx/wxWidgets/trunk@61023 c3d73ce0-8a6f-49c7-b76d-6d57e0e08775
This commit is contained in:
Vadim Zeitlin 2009-06-12 15:35:17 +00:00
parent d9e80dce15
commit 0241477aee
1 changed files with 4 additions and 4 deletions
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8
interface/wx/image.h
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@ -276,10 +276,10 @@ const unsigned char wxIMAGE_ALPHA_OPAQUE = 0xff;
The constants ::wxIMAGE_ALPHA_TRANSPARENT and ::wxIMAGE_ALPHA_OPAQUE can be
used to indicate those values in a more readable form.
Unlike RGB data, not all images have an alpha channel and before using
wxImage::GetAlpha you should check if this image contains an alpha channel
with wxImage::HasAlpha. Note that currently only the PNG format has full
alpha channel support so only the images loaded from PNG files can have
While all images have RGB data, not all images have an alpha channel. Before
using wxImage::GetAlpha you should check if this image contains an alpha
channel with wxImage::HasAlpha. Note that currently only the PNG format has
full alpha channel support so only the images loaded from PNG files can have
alpha and, if you initialize the image alpha channel yourself using
wxImage::SetAlpha, you should save it in PNG format to avoid losing it.