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James Gregory 2013-12-30 20:26:41 +11:00
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Four-pixel-wide patterns are more useful than you might imagine. There
are actually 2128 possible patterns (16 pixels, each with 28 possible
colors); that set is certainly large enough for most color-dithering
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![](images/i.jpg) *Although copying through the latches is, in general, a speedy technique, especially on slower VGAs, it's not always a win. Reading video memory tends to be quite a bit slower than writing, and on a fast VLB or PCI adapter, it can be faster to copy from main memory to display memory than it is to copy from display memory to display memory via the latches.*
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* * * * *
Graphics Programming Black Book © 2001 Michael Abrash