[Coco] wanting to patch HPUT routine... (ping RG!)

[theother_bob]

----- Original Message ----
From: Gene Heskett <gene.heskett at verizon.net>
To: CoCoList for Color Computer Enthusiasts <coco at maltedmedia.com>
Sent: Sunday, August 16, 2009 10:13:13 AM
Subject: Re: [Coco] wanting to patch HPUT routine... (ping RG!)

On Sunday 16 August 2009, theother_bob wrote:
>I'm experimenting with speeding up the cursor drawing routine in Color FOG.
> I've found that while I can get faster results with HPUT, it actually looks
> a bit more "flickery" due to the process...
>
<snip>
>
>My goal is to speed up the process to a single HPUT operation. Basically I
> want to support "transparency" in HPUT by ignoring pixels of palette 0.
>
<snip>
>
>Thoughts? Coding help?

Historically, cursors have been a single xor operation.  Put the curser in its 
buffer box, xor that buffer to the screen location to draw it, xor the same 
data to erase it, then move it to the new location and xor it there.  That 
reduces the usage of a bunch of buffers to just one, and the screen updates 
are going to be about as fast as the coco can do them, which isn't going to be 
entirely flicker free.  Only use more cursor buffers if you want to have 
multiple cursor styles to indicate the sort of an operation that a click will 
perform.  They of course can be pre-drawn so your proggy only has to do it 
once.
>
<snip>


 This seems like it would be great for B&W, and I may use it in a hires, 4-color version,
but on HSCREEN2 it mixes the colors, which is "undesirable" in this case. 

My cursor uses 3 palette colors, so I have to mask out (zero out) the colors behind it
before ORing it into place.

If the HPUT command included the XOR option, it would probably have been broken anyway,
like the NOT option is.

Bob


-- 
Cheers, Gene
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