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=47//-->
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<!--UNASSIGNED2//--></HEAD><BODY LINK=#0000FF ALINK=#000099 VLINK=#0000FF BGCOLOR=#FFFFFF>
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<P>It goes without saying that this is one ugly bitmap organization, requiring a lot of overhead to manipulate a single pixel. The write pixel code shown in Listing 47.2 must determine the appropriate plane and perform a 16-bit <B>OUT</B> to select that plane for each pixel written, and likewise for the read pixel code shown in Listing 47.3. Calculating and mapping in a plane once for each pixel written is scarcely a recipe for performance.</P>
<P>That&rsquo;s all right, though, because most graphics software spends little time drawing individual pixels. I&rsquo;ve provided the write and read pixel routines as basic primitives, and so you&rsquo;ll understand how the bitmap is organized, but the building blocks of high-performance graphics software are fills, copies, and bitblts, and it&rsquo;s there that Mode X shines.</P>
<P><A NAME="Fig1"><!-- </A><A HREF="javascript:displayWindow('images/47-01.jpg',408,263 )"> --><IMG SRC="images/47-01.jpg"><BR><!-- </A>
<BR><A HREF="javascript:displayWindow('images/47-01.jpg',408,263)"> --><FONT COLOR="#000077"><B>Figure 47.1</B></FONT></A>&nbsp;&nbsp;<I>Mode X display memory organization.</I>
<BR><A HREF="javascript:displayWindow('images/47-01.jpg',408,263)"> --><B>Figure 47.1</B></A>&nbsp;&nbsp;<I>Mode X display memory organization.</I>
</P>
<P><B>LISTING 47.2 L47-2.ASM</B></P>
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<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
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