| Title: | DECWINDOWS 26-JAN-89 to 29-NOV-90 |
| Notice: | See 1639.0 for VMS V5.3 kit; 2043.0 for 5.4 IFT kit |
| Moderator: | STAR::VATNE |
| Created: | Mon Oct 30 1989 |
| Last Modified: | Mon Dec 31 1990 |
| Last Successful Update: | Fri Jun 06 1997 |
| Number of topics: | 3726 |
| Total number of notes: | 19516 |
I am having a problem getting my colormap set up properly on a 24 plane firefox. (I have posted a similar note in the firefox conference.) I have found the visual for the directcolor map, and created a colormap using it. The problem occurs after I allocate color cells in my colormap and attempt to use x$store_color the first time. The error message is: X error event received from server: BadAccess - attempt to access private resource Failed request major op code 89 X_StoreColors Failed request minor op code 0 (if applicable) ResourceID 0x0 in failed request (if applicable) Serial number of failed request 147 %XLIB-E-ERROREVENT, error event received from server According to the reference manual, x$alloc_color_cells is successful if it returns a non-zero value. I have checked this value in the debugger and it returns: 47939600. I looked at examples which seem to expect that it returns a value of 1. I also examined the contents of the pixel array and all the values returned (in my code) were zero, they were non-zero and increased by a fixed size in the examples. Any ideas of what this all means? Thanks for any help! Barbara
| T.R | Title | User | Personal Name | Date | Lines |
|---|---|---|---|---|---|
| 1313.1 | suggestion? | CB750C::BOLGATZ | Mon Aug 21 1989 15:49 | 5 | |
Try XAllocColor - I believe XAllocColorCells allocates read/write color
cells, which isn't supported on a static/true color machine
Jay
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| 1313.2 | PSW::WINALSKI | Meetings are our most important product | Tue Aug 22 1989 16:00 | 10 | |
RE: .0 Are you really using a DirectColor visual? The default visual for Firefox is TrueColor, not DirectColor. You can't get read/write color cells on a TrueColor visual--you should acquire pixel values using XAllocColor(). If you really are using DirectColor, according to Gettys, Scheifler, and Newman, you have to use XAllocColorPlanes, not XAllocColorCells, to get read/write pixel values. --PSW | |||||
| 1313.3 | CADSE::UPHAM | Barbara Upham | Tue Aug 22 1989 18:31 | 28 | |
RE: .2 Yes, I am using a DirectColor visual. I know that the DirectColor visual is read-only, so I no longer use the default visual and colormap. As, for XAllocColorCells I have an example that works correctly using DirectColor (from the Firefox conference) which is why I am really frustrated by my inability to tranlate the example into my code (from C to Bliss). Also, SG&N don't seem to be saying that you can't use DirectColor with this call since they discuss how the masks work. (Maybe they are implying that using the Planes routine is better?) I would really like to stick with the color cells if possible since it will reduce the amount of changes I will need to make for one specific device (it currently runs on 1, 4, and 8 plane devices). How about another approach--can I easily find a PseudoColor visual that could hopefully suit my needs? As an aside, when the documentation says the return is successful if it is non-zero, do they really mean if it equals 1? Thanks for the suggestions and advise so far, Barbara | |||||