1<!DOCTYPE HTML PUBLIC "-//W3C//DTD HTML 4.01 Transitional//EN"> 2<HTML> 3<HEAD> 4<META http-equiv="Content-Type" content="text/html; charset=windows-1252"> 5<META http-equiv="Content-Style-Type" content="text/css"> 6<META name="GENERATOR" content="Microsoft FrontPage 5.0"> 7<LINK rel="stylesheet" type="text/css" href="../CSS/revolution.css"> 8<TITLE>GDLObj</TITLE> 9</HEAD> 10<BODY> 11<H1 align="left">GDLObj</H1> 12<H2>C Specification</H2> 13<DL> 14 <DD> 15 <PRE><CODE>typedef struct _GDLObj { 16 u8 *start; 17 u32 length; 18 u8 *ptr; 19 u8 *top; 20} GDLObj;</CODE></PRE> 21</DL> 22<H2>Description</H2> 23<P>This structure contains information related to a graphics display list. This structure should be initialized with the <a href="GDInitGDLObj.html"><CODE>GDInitGDLObj</CODE></a> function.</P> 24<P>The <CODE>start</CODE> field indicates the location of the buffer that stores the actual display list commands. It must be 32-byte aligned.</P> 25<P>The <code>length</code> field indicates the size of the buffer. It must be a multiple of 32.</P> 26<P>The <code>ptr</code> field indicates the current location pointer for this <CODE>GDLObj</CODE>. The pointer should always point between <code>start</code> and <code>top</code>.</P> 27<P><code>top</code> should always be set to (<code>start</code> + <code>length</code>). This structure is used to check overflow.</P> 28<H2>Functions That Use This Structure</H2> 29<P><CODE><a href="GDInitGDLObj.html">GDInitGDLObj</a><br> <a href="GDGetGDLObjStart.html">GDGetGDLObjStart</a><br> <a href="GDGetGDLObjLength.html">GDGetGDLObjLength</a><br> <a href="GDGetGDLObjPointer.html">GDGetGDLObjPointer</a><br> <a href="GDGetGDLObjOffset.html">GDGetGDLObjOffset</a><br> <a href="GDSetCurrent.html">GDSetCurrent</a><br> <a href="GDGetCurrent.html">GDGetCurrent</a><br> <a href="GDIsCurrent.html">GDIsCurrent</a></CODE></P> 30<P>(All of the <a href="gdgx.html">GD graphics commands</a> implicitly use the current <CODE>GDLObj</CODE>.)</P> 31<H2>Revision History</H2> 32</code> 33<P>2006/03/01 Initial version.</p> 34<hr> 35<P>CONFIDENTIAL</p> 36</BODY> 37</HTML>