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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<P>Also, page flipping requires that you keep the contents of both buffers up to date, which can require a good deal of extra drawing.</P>
<P>Finally, page flipping requires that you wait until you&rsquo;re sure the page has flipped before you start drawing to the other page. Otherwise, you could end up modifying a page while it&rsquo;s still being displayed, defeating the whole purpose of page flipping. Waiting for pages to flip takes time and can slow overall performance significantly. What&rsquo;s more, it&rsquo;s sometimes difficult to be sure when the page has flipped, since not all VGA clones implement the display adapter status bits and page flip timing identically.</P>
<P>To sum up, bit-plane animation by itself is very fast and looks good. In conjunction with page flipping, bit-plane animation looks a little better but is slower, and the overall animation scheme is more difficult to implement and perhaps a bit less reliable on some computers.</P>
<H3><A NAME="Heading8"></A><FONT COLOR="#000077">Beating the Odds in the Jaw-Dropping Contest</FONT></H3>
<H3><A NAME="Heading8"></A>Beating the Odds in the Jaw-Dropping Contest</H3>
<P>Bit-plane animation is neat stuff. Heck, good animation of <I>any</I> sort is fun, and the PC is as good a place as any (well, almost any) to make people&rsquo;s jaws drop. (Certainly it&rsquo;s the place to go if you want to make a <I>lot</I> of jaws drop.) Don&rsquo;t let anyone tell you that you can&rsquo;t do good animation on the PC. You can&mdash;<I>if</I> you stretch your mind to find ways to bring the full power of the VGA to bear on your applications. Bit-plane animation isn&rsquo;t for every task; neither are page flipping, exclusive-ORing, pixel panning, or any of the many other animation techniques you have available. One or more tricks from that grab-bag should give you what you need, though, and the bigger your grab-bag, the better your programs.</P><P><BR></P>
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<font face="Verdana,sans-serif" size="1">Graphics Programming Black Book &copy; 2001 Michael Abrash</font>
Graphics Programming Black Book &copy; 2001 Michael Abrash
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