Mirrors_UI_SDK/fltk
1
0
Fork 0
mirror of https://github.com/fltk/fltk.git synced 2026-06-04 15:32:12 +08:00
Code Issues Actions 1 Packages Projects Releases Wiki Activity

Added documentation for "fl_can_do_alpha_blending()"

Browse Source 
git-svn-id: file:///fltk/svn/fltk/branches/branch-1.1@5434 ea41ed52-d2ee-0310-a9c1-e6b18d33e121
This commit is contained in:
Matthias Melcher
2006-09-16 13:46:34 +00:00
parent c6de2dd3ef
commit f55b412582
2 changed files with 21 additions and 13 deletions
Download Patch File Download Diff File Expand all files Collapse all files
documentation/drawing.html
+13 -7
View File
@@ -865,13 +865,19 @@ color.
The <TT>draw()</TT> method draws the image using the colors in the
file, and masks off any transparent colors automatically.
<P>The <TT>Fl_RGB_Image</TT> class encapsulates a full-color (or
grayscale) image with 1 to 4 color components. Images with an
even number of components are assumed to contain an alpha
channel that is used for transparency. The transparency provided
by the <TT>draw()</TT> method is either a 24-bit blend against
the existing window contents or a "screen door" transparency
mask, depending on the platform and screen color depth.
<P>The <TT>Fl_RGB_Image</TT> class encapsulates a full-color
(or grayscale) image with 1 to 4 color components. Images with
an even number of components are assumed to contain an
alpha channel that is used for transparency. The transparency
provided by the <TT>draw()</TT> method is either a 24-bit
blend against the existing window contents or a "screen door"
transparency mask, depending on the platform and screen color depth.
<H4><A NAME=fl_can_do_alpha_blending>char fl_can_do_alpha_blending()</A></H4>
<P><TT>fl_can_do_alpha_blending()</TT> will return 1, if your
platform supports true alpha blending for RGBA images, or 0,
if FLTK will use screen door transparency.
<P>FLTK also provides several image classes based on the three
standard image types for common file formats: