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Added documentation for "fl_can_do_alpha_blending()"

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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
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documentation/drawing.html
+13 -7
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@@ -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:
documentation/functions.html
+8 -6
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@@ -27,6 +27,7 @@ A</A>.
<LI><A HREF="drawing.html#fl_begin_points"><TT>fl_begin_points</TT></A></LI>
<LI><A HREF="drawing.html#fl_begin_polygon"><TT>fl_begin_polygon</TT></A></LI>
<LI><A HREF="osissues.html#WIN32.gdi"><TT>fl_brush</TT></A> (WIN32)</LI>
<LI><A HREF="drawing.html#fl_can_do_alpha_blending"><TT>fl_can_do_alpha_blending</TT></A></LI>
<LI><A HREF="#fl_casealphasort"><TT>fl_casealphasort</TT></A></LI>
<LI><A HREF="#fl_casenumericsort"><TT>fl_casenumericsort</TT></A></LI>
<LI><A HREF="#fl_choice2"><TT>fl_choice</TT></A></LI>
@@ -99,11 +100,11 @@ A</A>.
<LI><A HREF="drawing.html#fl_measure"><TT>fl_measure</TT></A></LI>
<LI><A HREF="drawing.html#fl_measure_pixmap"><TT>fl_measure_pixmap</TT></A></LI>
<LI><A HREF="#fl_message"><TT>fl_message</TT></A></LI>
<LI><A HREF="#fl_message_font"><TT>fl_message_font</TT></A></LI>
</UL>
</TD>
<TD width=30%>
<UL>
<LI><A HREF="#fl_message_font"><TT>fl_message_font</TT></A></LI>
<LI><A HREF="#fl_message_icon"><TT>fl_message_icon</TT></A></LI>
<LI><A HREF="drawing.html#fl_scale"><TT>fl_mult_matrix</TT></A></LI>
<LI><A HREF="drawing.html#fl_not_clipped"><TT>fl_not_clipped</TT></A></LI>
@@ -314,12 +315,13 @@ A</A>.
<LI>Image Functions
<UL>
<LI><A HREF="drawing.html#fl_can_do_alpha_blending"><TT>fl_can_do_alpha_blending</TT></A></LI>
<LI><A HREF="#fl_register_images"><TT>fl_register_images</TT></A></LI>
<LI><A HREF="drawing.html#fl_draw_image"><TT>fl_draw_image</TT></A></LI>
<LI><A HREF="drawing.html#fl_draw_image"><TT>fl_draw_image_mono</TT></A></LI>
<LI><A HREF="drawing.html#fl_draw_pixmap"><TT>fl_draw_pixmap</TT></A></LI>
<LI><A HREF="drawing.html#fl_measure_pixmap"><TT>fl_measure_pixmap</TT></A></LI>
<LI><A HREF="drawing.html#fl_read_image"><TT>fl_read_image</TT></A></LI>
<LI><A HREF="drawing.html#fl_draw_image"><TT>fl_draw_image</TT></A></LI>
<LI><A HREF="drawing.html#fl_draw_image"><TT>fl_draw_image_mono</TT></A></LI>
<LI><A HREF="drawing.html#fl_draw_pixmap"><TT>fl_draw_pixmap</TT></A></LI>
<LI><A HREF="drawing.html#fl_measure_pixmap"><TT>fl_measure_pixmap</TT></A></LI>
<LI><A HREF="drawing.html#fl_read_image"><TT>fl_read_image</TT></A></LI>
</UL>
</LI>