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James Gregory 2013-12-30 12:25:34 +11:00
commit 9e52de9586
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47-05.html
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@ -37,7 +37,7 @@
</CENTER>
<P><BR></P>
<TABLE WIDTH="100%">
<TD WIDTH="5%" VALIGN="TOP"><IMG SRC="images/47-01i.jpg"><TD WIDTH="95%" VALIGN="TOP"><SMALL><I>In general, performing plane-at-a-time operations can make almost any Mode X operation, at the worst, nearly as fast as the same operation in mode 13H (although this sort of Mode X programming is admittedly fairly complex). In this pursuit, it can help to organize data structures with Mode X in mind. For example, icons could be prearranged in system memory with the pixels organized into four plane-oriented sets (or, again, in four sets per scan line to avoid a fading-in effect) to facilitate copying to the screen a plane at a time with <B>REP MOVS</B></SMALL></I>
<TD WIDTH="5%" VALIGN="TOP"><IMG SRC="images/i.jpg"><TD WIDTH="95%" VALIGN="TOP"><SMALL><I>In general, performing plane-at-a-time operations can make almost any Mode X operation, at the worst, nearly as fast as the same operation in mode 13H (although this sort of Mode X programming is admittedly fairly complex). In this pursuit, it can help to organize data structures with Mode X in mind. For example, icons could be prearranged in system memory with the pixels organized into four plane-oriented sets (or, again, in four sets per scan line to avoid a fading-in effect) to facilitate copying to the screen a plane at a time with <B>REP MOVS</B></SMALL></I>
</TABLE>
<P><B>LISTING 47.5 L47-5.ASM</B></P>
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