Misc/abrash-black-book
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James Gregory 2013-12-30 20:26:41 +11:00
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49-03.md
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@ -1,7 +1,3 @@
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[Previous](49-02.html) [Table of Contents](index.html) [Next](49-04.html)
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It would be handy to have a function that, given a base image and mask,
generates the four image and mask alignments and fills in the
**MaskedImage** structure. Listing 49.3, together with the include file
@ -124,11 +120,3 @@ used separate parameters for simplicity and flexibility.
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![](images/i.jpg) *Be aware that as nifty as Mode X hardware-assisted masked copying is, whether or not it's actually faster than software-only masked or transparent copying depends upon the processor and the video adapter. The advantage of Mode X masked copying is the 32-bit parallelism; the disadvantages are the need to read display memory and the need to perform an **OUT** for every four pixels. (**OUT** is a slow 486/Pentium instruction, and most VGAs respond to **OUT**s much more slowly than to display memory writes.)*
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[Previous](49-02.html) [Table of Contents](index.html) [Next](49-04.html)
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* * * * *
Graphics Programming Black Book © 2001 Michael Abrash