[Info-vax] bizarre problem displaying JPEG files with CSWB

[JF Mezei]

Phillip Helbig---undress to reply wrote:

> %DCL-W-IVVERB, unrecognized command verb - check validity and spelling
>  \XDPYINFO\


It shoudl be in decw$utils

$mc decw$utils:xdpyinfo works on Alpha VMS 8.3

You need to stop scrolling early because the list of extensions is some
of the first stuff to come out.

The "display" in this case is the X windows server. It is the component
whicg receices X commands from the CSWB application and tries to display
it o whatever graphics output it has. Lack of memory in the X server
(the X terminal) will result in some large bitmaps not displaying.

> Right.  However, it still loads the entire data.

CSWB will still load the entire data. But it will scale the image to fit
the HTML area allocated to it, and only send the smaller bitmap to the X
display. So even though the file is huge, the generated bitmap will be
small when the HTML code only gives it a small amount of space.

In your case, you need to figure out if it is CSWB which is barfing at
the large image, and not sending it to the X display, or if CSWB
processes the big image fine and sends it big to the display and it is
the X display which barfs because it can't handle such a large image.

Some extensions will allow the whole bitmap to reside in the display
even though only part is being displayed. This makes for much faster
scrolling because the application doesn't have to constantly redraw the
bitmap to add the newsly "exposed" area.