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Strip comments and inline ids onto h*

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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: Yet Another VGA Write Mode</title><!-- HEADER -->
<!-- Empty Reference Subhead -->
<!--ISBN=1576101746//-->
<!--TITLE=Michael Abrash's Graphics Programming Black Book Special Edition//-->
<!--AUTHOR=Michael Abrash//-->
<!--PUBLISHER=The Coriolis Group, Inc.//-->
<title>Michael Abrash's Graphics Programming Black Book Special Edition: Yet Another VGA Write Mode</title>
<meta name="chapter" content="27" />
<meta name="pages" content="504-508" />
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<body>
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<p><br /></p>
<h4 align="left"><a id="Heading5"></a>Copying Chunky Bitmaps to VGA Memory Using Write Mode 2</h4>
<h4 align="left" id="Heading5">Copying Chunky Bitmaps to VGA Memory Using Write Mode 2</h4>
<p>Let&rsquo;s take a look at two examples of write mode 2 in action. Listing 27.1 presents a program that uses write mode 2 to copy a graphics image in chunky format to the VGA. In chunky format adjacent bits in a single byte make up each pixel: mode 4 of the CGA, EGA, and VGA is a 2-bit-per-pixel chunky mode, and mode 13H of the VGA is an 8-bit-per-pixel chunky mode. Chunky format is convenient, since all the information about each pixel is contained in a single byte; consequently chunky format is often used to store bitmaps in system memory.</p>
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<p>This process is then repeated for the rightmost chunky pixel, if necessary, and repeated again for as many pixels as there are in the image.</p>
<p><b>LISTING 27.1 L27-1.ASM</b></p><!-- CODE //-->
<p><b>LISTING 27.1 L27-1.ASM</b></p>
<pre>
; Program to illustrate one use of write mode 2 of the VGA and EGA by
; animating the image of an &ldquo;A&rdquo; drawn by copying it from a chunky
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DrawFromChunkyBitmap endp
Code ends
end Start
</pre><!-- END CODE //-->
</pre>
<p><br /></p>
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<div align="center">
Graphics Programming Black Book &copy; 2001 Michael Abrash
</div><!-- all of the reference materials (books) have the footer and subfoot reveresed -->
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