From c4ca69d3fa84dca98dce71c7a71b61413d6be165 Mon Sep 17 00:00:00 2001
From: scuri <scuri>
Date: Tue, 27 Oct 2009 19:45:36 +0000
Subject: Fixed: compositing in IMAGERGB when canvas has a semi-transparent
alpha channel and a color with semi transparent alpha are used.
---
html/en/func/attributes.html | 4 ++--
html/en/func/color.html | 9 +++++----
2 files changed, 7 insertions(+), 6 deletions(-)
(limited to 'html/en/func')
diff --git a/html/en/func/attributes.html b/html/en/func/attributes.html
index 60768e4..984af01 100644
--- a/html/en/func/attributes.html
+++ b/html/en/func/attributes.html
@@ -17,7 +17,7 @@ canvas:SetForeground(color: lightuserdata) [in Lua]</pre>
color is used in all primitives (lines, areas, marks and text). Default value: <b>
<tt>CD_BLACK</tt></b>. Value <tt><b>CD_QUERY</b> </tt>simply returns the
current value.</p>
- <p>Notice that CD_QUERY conflicts with color RGBA=(255,255,255,255) (full
+ <p>Notice that CD_QUERY conflicts with color RGBA=(255,255,255,0) (full
transparent white). Use <strong>SetForeground</strong> to avoid the
conflict. See also <a href="color.html">Color Coding</a>.</p>
<pre class="function"><span class="mainFunction">long int <a name="cdBackground">cdCanvasBackground</a>(cdCanvas* canvas, long int color); [in C]</span>
@@ -31,7 +31,7 @@ canvas:SetBackground(color: lightuserdata) [in Lua]</pre>
background color only makes sense for <strong>Clear</strong><tt><font> </font></tt>and for
primitives affected by the background opacity attribute. Default value: <b><tt>CD_WHITE</tt></b>.
Value <tt><b>CD_QUERY</b> </tt>simply returns the current value.</p>
- <p>Notice that CD_QUERY conflicts with color RGBA=(255,255,255,255) (full
+ <p>Notice that CD_QUERY conflicts with color RGBA=(255,255,255,0) (full
transparent white). Use <strong>SetBackground</strong> to avoid the
conflict. See also <a href="color.html">Color Coding</a>.</p>
<pre class="function"><span class="mainFunction">int <a name="cdWriteMode">cdCanvasWriteMode</a>(cdCanvas* canvas, int mode); [in C]</span>
diff --git a/html/en/func/color.html b/html/en/func/color.html
index 9ec9928..8efd8a4 100644
--- a/html/en/func/color.html
+++ b/html/en/func/color.html
@@ -52,12 +52,13 @@ cd.DecodeColor(color: lightuserdata) -> (r, g, b: number) [in Lua]</pre>
cd.EncodeAlpha(color: lightuserdata, alpha: number) -> (color: lightuserdata) [in Lua]</pre>
<p>Returns the given color coded with the alpha information. ATENTION: At the
- moment only the Win32 with GDI+ and the IMAGERGB drivers support alpha
- components in color coding. Se in <a href="../drv/gdiplus.html">Windows Using
- GDI+ Base Driver</a> and <a href="../drv/irgb.html">IMAGERGB driver</a>. The
+ moment only the <a href="../drv/gdiplus.html">Win32 with GDI+</a>, the
+ <a href="../drv/xrender.html">XRender</a> and the <a href="../drv/irgb.html">IMAGERGB</a>
+ drivers support alpha components in color coding. The
internal representation of the component is inverted, because the default value
must be 0 and opaque for backward compatibility, so you should use the <strong>cdDecodeAlpha</strong>
- function ot the <strong>cdAlpha</strong> macro to retrieve the alpha component.</p>
+ function or the <strong>cdAlpha</strong> macro to retrieve the alpha component.
+ 0 is transparent, 255 is opaque.</p>
<pre class="function"><span class="mainFunction">unsigned char <a name="cdDecodeAlpha">cdDecodeAlpha</a>(long int color) [in C]</span>
cd.DecodeAlpha(color: lightuserdata) -> (a: number) [in Lua]</pre>
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