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- Newsgroups: comp.windows.x.apps
- Path: sparky!uunet!noc.near.net!gateway!miki!oj
- From: oj@miki.pictel.com (Oliver Jones)
- Subject: Re: Pixmaps: XY or Z ?
- Message-ID: <1992Aug27.132413.3248@miki.pictel.com>
- Organization: PictureTel Corporation
- References: <1992Aug26.070958.10963@walter.cray.com>
- Date: Thu, 27 Aug 1992 13:24:13 GMT
- Lines: 17
-
- In article <1992Aug26.070958.10963@walter.cray.com> vincent@cadillac.cray.com (Vincent LE BARAZER) writes:
-
- > What is the difference between XYPixmap and ZPixmap ?
-
- You can think of an XYPixmap-format XImage as a vector of bitmaps,
- whereas you can think of a ZPixmap-format XImage as a two-dimensional
- array of pixel values.
-
- >When using XGetImage, it seems that ZPixmaps makes it run faster
- >than XYPixmaps ..??
-
- Well, many color servers have a "natural" pixmap format which looks
- like ZPixmap. If you ask such servers to deliver XYPixmap-format
- XImages, the bits in the image have to be reformatted. This takes
- time.
-
- Ollie Jones
-