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James Gregory 2013-12-30 15:11:04 +11:00
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<meta name="vspubdate" content="07/01/97" />
<meta name="vscategory" content="Web and Software Development: Game Development,Web and Software Development: Graphics and Multimedia Development" />
<title>Michael Abrash's Graphics Programming Black Book Special Edition: Who Was that Masked Image?</title><!-- HEADER -->
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<!--ISBN=1576101746//-->
<!--TITLE=Michael Abrash's Graphics Programming Black Book Special Edition//-->
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<title>Michael Abrash's Graphics Programming Black Book Special Edition: Who Was that Masked Image?</title>
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<meta name="pages" content="859-862" />
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<p><br /></p>
<h2><a id="Heading1"></a>Chapter 46<br />
<h2 id="Heading1">Chapter 46<br />
Who Was that Masked Image?</h2>
<h3><a id="Heading2"></a>Optimizing Dirty-Rectangle Animation</h3>
<h3 id="Heading2">Optimizing Dirty-Rectangle Animation</h3>
<p>Programming is, by and large, a linear process. One statement or instruction follows another, in predictable sequences, with tiny building blocks strung together to make thinking, which is, of course, A Good Thing. Still, it&rsquo;s important to keep in mind that there&rsquo;s a large chunk of the human mind that doesn&rsquo;t work in a linear fashion.</p>
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<p>We&rsquo;re strange thinking machines, but we&rsquo;re the best ones yet invented, and it&rsquo;s worth learning how to tap our full potential. And with that, it&rsquo;s back to dirty-rectangle animation.</p>
<h4 align="left"><a id="Heading3"></a>Dirty-Rectangle Animation, Continued</h4>
<h4 align="left" id="Heading3">Dirty-Rectangle Animation, Continued</h4>
<p>In the last chapter, Introduced the idea of dirty-rectangle animation. This technique is an alternative to page flipping that&rsquo;s capable of producing animation of very high visual quality, without any help at all from video hardware, and without the need for any extra, nondisplayed video memory. This makes dirty-rectangle animation more widely usable than page flipping, because many adapters don&rsquo;t support page flipping. Dirty-rectangle animation also tends to be simpler to implement than page flipping, because there&rsquo;s only one bitmap to keep track of. A final advantage of dirty-rectangle animation is that it&rsquo;s potentially somewhat faster than page flipping, because display-memory accesses can theoretically be reduced to exactly one access for each pixel that changes from one frame to the next.</p>
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<div align="center">
Graphics Programming Black Book &copy; 2001 Michael Abrash
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