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authorDavid Thompson <dthompson2@worcester.edu>2021-04-13 11:30:50 -0400
committerDavid Thompson <dthompson2@worcester.edu>2021-04-13 11:30:50 -0400
commitce9d6e8ad28b2d84d1a292a871c23b66a4654b54 (patch)
treeade44e7bb7b891c9ae0ceba18633ef4b2a911a7c /manuals/guile-sdl2/Blend-Modes.html
parent2a30eb2a2d5472be3df1254d5d4d04310314e628 (diff)
Add new guile-sdl2 and chickadee releases.
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+<!DOCTYPE html PUBLIC "-//W3C//DTD HTML 4.01 Transitional//EN" "http://www.w3.org/TR/html4/loose.dtd">
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+<!-- Copyright (C) 2016, 2017, 2018, 2019 David Thompson davet@gnu.org
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+Permission is granted to copy, distribute and/or modify this document
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+or any later version published by the Free Software Foundation;
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+A copy of the license is included in the section entitled "GNU
+Free Documentation License".
+
+A copy of the license is also available from the Free Software
+Foundation Web site at http://www.gnu.org/licenses/fdl.html.
+
+
+* Guile-SDL2: (guile-sdl2). SDL2 bindings for Guile.
+
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+<meta http-equiv="Content-Type" content="text/html; charset=utf-8">
+<title>Blend Modes (Guile-SDL2)</title>
+
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+<body lang="en">
+<span id="Blend-Modes"></span><div class="header">
+<p>
+Next: <a href="Images.html" accesskey="n" rel="next">Images</a>, Previous: <a href="Rendering.html" accesskey="p" rel="prev">Rendering</a>, Up: <a href="API-Reference.html" accesskey="u" rel="up">API Reference</a> &nbsp; [<a href="index.html#SEC_Contents" title="Table of contents" rel="contents">Contents</a>][<a href="Index.html" title="Index" rel="index">Index</a>]</p>
+</div>
+<hr>
+<span id="Blend-Modes-1"></span><h3 class="section">3.8 Blend Modes</h3>
+
+<div class="example">
+<pre class="example">(use-modules (sdl2 blend-mode))
+</pre></div>
+
+<p>SDL2 provides several of the most commonly used blend modes:
+</p>
+<dl>
+<dt id="index-none">Variable: <strong>none</strong></dt>
+<dd><p>No blending.
+</p></dd></dl>
+
+<dl>
+<dt id="index-blend">Variable: <strong>blend</strong></dt>
+<dd><p>Alpha blending.
+</p></dd></dl>
+
+<dl>
+<dt id="index-add">Variable: <strong>add</strong></dt>
+<dd><p>Additive blending.
+</p></dd></dl>
+
+<dl>
+<dt id="index-mul">Variable: <strong>mul</strong></dt>
+<dd><p>Multiplicative blending.
+</p></dd></dl>
+
+<dl>
+<dt id="index-mod">Variable: <strong>mod</strong></dt>
+<dd><p>Color modulation.
+</p></dd></dl>
+
+<p>Custom blend modes can be created using the <code>make-blend-mode</code>
+procedure.
+</p>
+<dl>
+<dt id="index-make_002dblend_002dmode">Procedure: <strong>make-blend-mode</strong> <em>src-color-factor dst-color-factor color-operation src-alpha-factor dst-alpha-factor alpha-operation</em></dt>
+<dd><p>Return a new custom blend mode for renderers.
+</p>
+<p><var>src-color-factor</var> applies to the red, green, and blue components
+of the source pixels.
+</p>
+<p><var>dst-color-factor</var> applies to the red, green, and blue components of the
+destination pixels.
+</p>
+<p><var>color-operation</var> specifies how to combine the red, green, and blue
+components of the source and destination pixels.
+</p>
+<p><var>src-alpha-factor</var> applies to the alpha component of the source pixels.
+</p>
+<p><var>dst-alpha-factor</var> applies to the alpha component of the destination
+pixels.
+</p>
+<p><var>alpha-operation</var> specifies how to combine the alpha component of the
+source and destination pixels.
+</p>
+<p>Possible values for factors are <code>zero</code>, <code>one</code>,
+<code>src-color</code>, <code>one-minus-src-color</code>, <code>src-alpha</code>,
+<code>one-minus-src-alpha</code>, <code>dst-color</code>,
+<code>one-minus-dst-color</code>, <code>dst-alpha</code>, and <code>one-minus-dst
+alpha</code>.
+</p>
+<p>Possible values for operations are <code>add</code>, <code>subtract</code>,
+<code>rev-subtract</code>, <code>minimum</code>, and <code>maximum</code>.
+</p></dd></dl>
+
+<dl>
+<dt id="index-blend_002dmode_003f">Procedure: <strong>blend-mode?</strong> <em>obj</em></dt>
+<dd><p>Return <code>#t</code> if <var>obj</var> is a blend mode object.
+</p></dd></dl>
+
+<dl>
+<dt id="index-blend_002dmode_002dsrc_002dcolor_002dfactor">Procedure: <strong>blend-mode-src-color-factor</strong> <em>blend-mode</em></dt>
+<dd><p>Return the source red, green, and blue channel blend factor for
+<var>blend-mode</var>.
+</p></dd></dl>
+
+<dl>
+<dt id="index-blend_002dmode_002ddst_002dcolor_002dfactor">Procedure: <strong>blend-mode-dst-color-factor</strong> <em>blend-mode</em></dt>
+<dd><p>Return the destination red, green, and blue channel blend factor for
+<var>blend-mode</var>.
+</p></dd></dl>
+
+<dl>
+<dt id="index-blend_002dmode_002dcolor_002doperation">Procedure: <strong>blend-mode-color-operation</strong> <em>blend-mode</em></dt>
+<dd><p>Return the red, green, and blue channel blend operation for
+<var>blend-mode</var>.
+</p></dd></dl>
+
+<dl>
+<dt id="index-blend_002dmode_002dsrc_002dalpha_002dfactor">Procedure: <strong>blend-mode-src-alpha-factor</strong> <em>blend-mode</em></dt>
+<dd><p>Return the source alpha channel blend factor for <var>blend-mode</var>.
+</p></dd></dl>
+
+<dl>
+<dt id="index-blend_002dmode_002ddst_002dalpha_002dfactor">Procedure: <strong>blend-mode-dst-alpha-factor</strong> <em>blend-mode</em></dt>
+<dd><p>Return the destination alpha channel blend factor for
+<var>blend-mode</var>.
+</p></dd></dl>
+
+<dl>
+<dt id="index-blend_002dmode_002dalpha_002doperation">Procedure: <strong>blend-mode-alpha-operation</strong> <em>blend-mode</em></dt>
+<dd><p>Return the alpha channel blend operation for <var>blend-mode</var>.
+</p></dd></dl>
+
+<hr>
+<div class="header">
+<p>
+Next: <a href="Images.html" accesskey="n" rel="next">Images</a>, Previous: <a href="Rendering.html" accesskey="p" rel="prev">Rendering</a>, Up: <a href="API-Reference.html" accesskey="u" rel="up">API Reference</a> &nbsp; [<a href="index.html#SEC_Contents" title="Table of contents" rel="contents">Contents</a>][<a href="Index.html" title="Index" rel="index">Index</a>]</p>
+</div>
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