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<!doctype HTML PUBLIC "-//IETF//DTD HTML//EN">
<html>
<head>
<meta http-equiv="Content-Language" content="en-us">
<meta http-equiv="Content-Type" content="text/html; charset=iso-8859-1">
<title>CD_IMAGE</title>
<link rel="stylesheet" type="text/css" href="../../style.css">
</head>
<body>
<h2>CD_IMAGE - Server Image Driver (cdimage.h)</h2>
<p>This driver provides access to a Server Image, a memory-based
high-performance image that corresponds to the attributes of the system's
devices. It is used for offscreen drawings.</p>
<h3>Use</h3>
<p>The canvas is created by means of a call to function
<a href="../func/init.html#cdCreateCanvas">
<font face="Courier"><strong>cdCreateCanvas</strong></font></a><font face="Courier">(CD_IMAGE,
Data)</font>, after which other functions in the CD library can be called as
usual. The function creates a CD canvas based on an existing Server Image. The
<font face="Courier">Data</font> parameter must be a pointer to an image
created with function
<a href="../func/server.html#cdCreateImage">
<font face="Courier"><strong>cdCreateImage</strong></font></a>.</p>
<p>Any amount of such canvases may exist simultaneously. It is important to
note that a call to function
<a href="../func/init.html#cdKillCanvas">
<font face="Courier"><strong>cdKillCanvas</strong></font></a> is required to
properly <b>end</b> the driver. You can call function
<a href="../func/server.html#cdKillImage">
<font face="Courier"><strong>cdKillImage</strong></font></a> only after
calling <font face="Courier"><strong>cdKillCanvas</strong></font>.</p>
<p>For use with CDLUA, the Server Image passed as parameter must have been
created with function <strong><font face="Courier">cd.CreateImage</font></strong>
in Lua.</p>
<p>To use this driver in Windows using GDI+ is necessary to call
<font face="Courier"><strong>
cdUseContextPlus</strong></font><strong><font face="Courier">(1)</font></strong>
before creating the canvas.</p>
<h3>Behavior of Functions</h3>
<p>This driver is greatly platform-dependent. For further detail, see the <b>
Behavior of Functions</b> in each platform: <a href="win32.html">Microsoft
Windows (GDI)</a>, <a href="gdiplus.html">Windows Using GDI+</a>,
<a href="xwin.html">X-Windows (XLIB)</a>. However, it should be noted that
some functions behave differently from the basic functions of each platform.</p>
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