Misc/abrash-black-book
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Retidy, removing align=left from headings and empty paragraphs

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James Gregory 2013-12-30 15:37:13 +11:00
commit a96a114403
362 changed files with 8472 additions and 5040 deletions
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47-04.html
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@ -1,5 +1,4 @@
<!DOCTYPE html PUBLIC "-//W3C//DTD XHTML 1.0 Transitional//EN"
"http://www.w3.org/TR/xhtml1/DTD/xhtml1-transitional.dtd">
<!DOCTYPE html>
<html xmlns="http://www.w3.org/1999/xhtml">
<head>
@ -19,17 +18,21 @@
<center>
<table border="1">
<tr>
<td><a href="47-03.html">Previous</a></td>
<td>
<a href="47-03.html">Previous</a>
</td>
<td><a href="index.html">Table of Contents</a></td>
<td>
<a href="index.html">Table of Contents</a>
</td>
<td><a href="47-05.html">Next</a></td>
<td>
<a href="47-05.html">Next</a>
</td>
</tr>
</table>
</center>
<p><br /></p>
<h3 id="Heading5">Designing from a Mode X Perspective</h3>
<p>Listing 47.4 shows Mode X rectangle fill code. The plane is selected for each pixel in turn, with drawing cycling from plane 0 to plane 3, then wrapping back to plane 0. This is the sort of code that stems from a write-pixel line of thinking; it reflects not a whit of the unique perspective that Mode X demands, and although it looks reasonably efficient, it is in fact some of the slowest graphics code you will ever see. I&rsquo;ve provided Listing 47.4 partly for illustrative purposes, but mostly so we&rsquo;ll have a point of reference for the substantial speed-up that&rsquo;s possible with code that&rsquo;s designed from a Mode X perspective.</p>
@ -132,16 +135,20 @@ _FillRectangleX endp
<p>Listing 47.5 is 2.5 times faster than Listing 47.4 at clearing the screen on a 20-MHz cached 386 with a Paradise VGA. Although Listing 47.5 is slightly slower than an equivalent mode 13H fill routine would be, it&rsquo;s not grievously so.</p>
<p><br /></p>
<center>
<table border="1">
<tr>
<td><a href="47-03.html">Previous</a></td>
<td>
<a href="47-03.html">Previous</a>
</td>
<td><a href="index.html">Table of Contents</a></td>
<td>
<a href="index.html">Table of Contents</a>
</td>
<td><a href="47-05.html">Next</a></td>
<td>
<a href="47-05.html">Next</a>
</td>
</tr>
</table>
</center>