Misc/abrash-black-book
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Remove colour attributes from body and strip most of the font tags out

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James Gregory 2013-12-30 13:57:02 +11:00
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@ -24,7 +24,7 @@
<!--CHAPTER=39//-->
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<!--UNASSIGNED2//--></HEAD><BODY LINK=#0000FF ALINK=#000099 VLINK=#0000FF BGCOLOR=#FFFFFF>
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<CENTER>
<TABLE BORDER>
@ -159,7 +159,7 @@ void ScanEdge(int X1, int Y1, int X2, int Y2, int SetXStart,
}
</PRE>
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<H3><A NAME="Heading6"></A><FONT COLOR="#000077">The Finishing Touch: Assembly Language</FONT></H3>
<H3><A NAME="Heading6"></A>The Finishing Touch: Assembly Language</H3>
<P>The C implementation in Listing 39.2 is now nearly 20 times as fast as the original, which is good enough for most purposes. Still, it requires that one of the large data models be used (for <B>memset</B> ), and it&rsquo;s certainly not the fastest possible code. The obvious next step is assembly language.</P>
<P>Listing 39.3 is an assembly language version of <B>DrawHorizontalLineList</B> . In actual use, it proved to be about 36 percent faster than Listing 39.1; better than a poke in the eye with a sharp stick, but just barely. There&rsquo;s more to these timing results than meets that eye, though. Display memory generally responds much more slowly than system memory, especially in 386 and 486 systems. That means that much of the time taken by Listing 39.3 is actually spent waiting for display memory accesses to complete, with the processor forced to idle by wait states. If, instead, Listing 39.3 drew to a local buffer in system memory or to a particularly fast VGA, the assembly implementation might well display a far more substantial advantage over the C code.</P><P><BR></P>
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@ -174,7 +174,7 @@ void ScanEdge(int X1, int Y1, int X2, int Y2, int SetXStart,
<hr width="90%" size="1" noshade>
<div align="center">
<font face="Verdana,sans-serif" size="1">Graphics Programming Black Book &copy; 2001 Michael Abrash</font>
Graphics Programming Black Book &copy; 2001 Michael Abrash
</div>
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