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| 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 |
2592.0. "reading color bitmap files from fortran ?
" by BLKPUD::THOMASA (Wow I,ve got a colour ....) Tue Apr 10 1990 10:17
Hi all,
Being new to this Xlib party I wonder if anyone can help with a problem
I'm having
What I,m trying to do is:- create a pixmap draw a complex color image to
the pixmap map it to a window and then save the picture in a bitmap file.
Then some time later read the bitmap file recreate a window and fill it
with the orriginal color picture.
(vms 5.3-1 decwindows v2.0 fortran 5.4)
The first bit it easy
X$create_window
play with color map
X$set_window_color_map
X$copy_area
x$write_bitmap_file(display,file,pixmap)
( bitmap file is created with the "c" statements in it )
later on I try to do
type *,'reading ...'
status=x$read_bitmap_file(dpy,win,%descr('bitmap.dat'),wr,hr,
2 ret_id,xh,yh)
if (status.ne.x$c_bitmap_success) then
type *,status
if (status.eq.x$c_bitmap_open_failed) type *,'open failed'
if (status.eq.x$c_bitmap_file_invalid) type *,'file invalid'
if (status.eq.x$c_bitmap_no_memory) type *,'no memory'
if (status.ne.0) call lib$stop(%val(status))
end if
type *,ret_id
type *,'copy ...'
call x$copy_area(dpy,ret_id,win,gc,0,0,wr,hr,0,0)
type *,'map ...'
call x$map_window(dpy,win)
on running I get .......
copy ...
X error event received from server: BadMatch - parameter mismatch
Failed request major op code 62 (X_CopyArea)
Failed request minor op code 0 (if applicable)
ResourceID 0xe00001 in failed request (if applicable)
Serial number of failed request 37
Current serial number in output stream 38
%XLIB-E-ERROREVENT, error event received from server
%TRACE-E-TRACEBACK, symbolic stack dump follows
module name routine name line rel PC abs PC
why is this happening ?
Is it possible to save a color image using x$write_bitmap_file and then
retrieve it fully later using x$read_bitmap_file ?????
Thanks all
Andy
ps: can anyone suggest a better way to handle the possible read_bitmap_file
error conditions ?
| T.R | Title | User | Personal
Name | Date | Lines |
|---|
| 2592.1 | almost the same but different | GSRC::WEST | Variables don't, Constants aren't | Tue Apr 10 1990 11:58 | 37 |
| RE: <<< Note 2592.0 by BLKPUD::THOMASA "Wow I,ve got a colour ...." >>>
-< reading color bitmap files from fortran ?
>-
First...some basic definitions.
A PIXMAP, like a window is a rectangular raster area on an X workstation
into which apps can draw. The major characteristics are:
Width and Height
Screen
Depth
The DEPTH of a pixmap can be of 1 or *more* planes.
A BITMAP is a lot like a PIXMAP except that its depth is *always* one. With
a bitmap you can only specify a foreground color and a background color. They
cannot contain multiple colors. When you wish to deal with pixmaps then you
have a variety of options to pursue when saving and retrieving them.
For instance, if you really want to deal with bitmaps then with clever use
of XCopyPlane you could copy each plane of the pixmap to a bitmap and write
out that bitmap.
You could look into converting the pixmap image to some other data type
such as DDIF, SIXEL, IFF, or even OFF.
Mind you that this is not trivial but can be done.
I book that I highly recommend is "Introduction to the X Window System" by
Oliver Jones. (ISBN 0-13-499997-5 Prentice-Hall). There is a real good
chapter on Pixmaps, Bitmaps, and Images.
Hope this provides the necessary insight.
-=> Jim <=-
|