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reworded parts of the 'alpha channel support' paragraph

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git-svn-id: https://svn.wxwidgets.org/svn/wx/wxWidgets/trunk@32282 c3d73ce0-8a6f-49c7-b76d-6d57e0e08775
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Dimitri Schoolwerth
2005-02-21 02:13:25 +00:00
parent cb0791531f
commit e0cb07e376
1 changed files with 7 additions and 8 deletions
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15
docs/latex/wx/image.tex
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@@ -19,17 +19,16 @@ creation of a \helpref{wxMask}{wxmask} object associated to the bitmap object.
Starting from wxWidgets 2.5.0 wxImage supports alpha channel data, that is in Starting from wxWidgets 2.5.0 wxImage supports alpha channel data, that is in
addition to a byte for the red, green and blue colour components for each pixel addition to a byte for the red, green and blue colour components for each pixel
it also stores a byte representing the pixel opacity. The alpha value of $0$ it also stores a byte representing the pixel opacity. An alpha value of $0$
corresponds to a transparent pixel (null opacity) while the value of $255$ corresponds to a transparent pixel (null opacity) while a value of $255$
means that the pixel is 100\% opaque. means that the pixel is 100\% opaque.
Unlike the RGB data, not all images have the alpha channel and before using Unlike RGB data, not all images have an alpha channel and before using
\helpref{GetAlpha}{wximagegetalpha} you should check if this image contains \helpref{GetAlpha}{wximagegetalpha} you should check if this image contains
alpha value with \helpref{HasAlpha}{wximagehasalpha}. In fact, currently only an alpha channel with \helpref{HasAlpha}{wximagehasalpha}. Note that currently only
images loaded from PNG files with transparency information will have alpha images loaded from PNG files with transparency information will have an alpha
channel but support for it will be added to the other formats as well (as well channel but alpha support will be added to the other formats as well (as well
as support for saving images with alpha channel which is not still implemented as support for saving images with alpha channel which also isn't implemented).
either).
\wxheading{Available image handlers} \wxheading{Available image handlers}