andyi@mmm.UUCP (Andy Ihlenfeldt) (06/29/89)
Hello Netters,
I have a few 32 Bit quickdraw questions and hope someone can give me some
suggestions to follow. We are developing on a MacII with 2 displays
(one 32 bit, one CLUT), using MPW 3.0 and SADE.
1) How do you create and draw into a 32-bit color window on a direct device?
We are using 2 devices, a CLUT and a direct device. So far, we have been
unable to create and draw into a window with the direct device
characteristics (32 bit pixel size).
2) How do you access the pixel map information associated with the window on
a direct device. In particular, when we try to access the memory
associated with the pixel map, we get an ## address out of range ##
error in the SADE debugger.
3) Finally, does anyone have any guidelines as to when it is necessary to use
SetOrigin? (oops, nothing to do with color quickdraw here, folks)
Thanks, any replies would be appreciated. What are you all doing with 32 BQD?
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Andy Ihlenfeldt andyi@mmm.UUCP
3M, St. Paul, MN (612) 736-7143oster@dewey.soe.berkeley.edu (David Phillip Oster) (06/30/89)
In article <1274@mmm.UUCP> andyi@mmm.UUCP (Andy Ihlenfeldt) writes: >1) How do you create and draw into a 32-bit color window on a direct device? Windows pick up their characteristics from the device they are on. If you create a color window on teh 32-bit device, or drag it onto the 32-bit device, it will be a 32-bit deep window. >2) How do you access the pixel map information associated with the window on > a direct device. In particular, when we try to access the memory > associated with the pixel map, we get an ## address out of range ## > error in the SADE debugger. The simple answer here, as I said in my previous posting: you can't. To access the memory of the 32-bit device, 32-bit Quickdraw must put the Mac into 32-bit mode, do the access, and return it to 24-bit mode. Since SADE works in 24-bit mode, of course you can't see the right memory. You can always use GetCPixel(). Or, you can CopyBits to an off-screen pixmap that you then access directly. >3) Finally, does anyone have any guidelines as to when it is necessary to use > SetOrigin? (oops, nothing to do with color quickdraw here, folks) SetOrigin is convenient when you are drawing algorithmic graphics, and you scroll the window (say, in repsonse to the user interacting with the scrollbar) with ScrollRect(), and then want your update procedure to drw the remainder of the screen. SetOrigin will let the new patterns align with the scrolled old ones. Remember to do a SetOrigin(0,0) after the update event, since the control manager needs it to draw controls correctly. Remembering how to adjust the clipRgn is a little tricky. (do you offset it not at all, the negative of the change to the origin, or equal to the change to the origin. Since there are only 3 choices, try them all. One will be correct.) >What are you all doing with 32 BQD? I wrote a color scanner for pre-production of color magazine photographs. The resolution of the scanner is 1000 pixels per inch.