Bug 690948

Summary:	BoundingBox/MediaSize info initialized too late in pxlcolor
Product:	Ghostscript	Reporter:	Hin-Tak Leung <htl10>
Component:	Vectors	Assignee:	Hin-Tak Leung <htl10>
Status:	CONFIRMED ---
Severity:	normal	CC:	christinedelight.top85, sphinx.pinastri
Priority:	P4	Keywords:	bountiable
Version:	master
Hardware:	PC
OS:	Linux
Customer:		Word Size:	---
Attachments:	Sample file

Description Hin-Tak Leung 2009-11-22 18:59:17 UTC

Bug690683.ps from tests_private/comparefiles has an unusual issue when processed
by the pxlcolor driver - the boundingbox info is only available after a few
drawing instructions (I think one of them is a design issue of gdevvec where a
clip path is issued on open). This causes a problem with PXL since the page
dimension are attributes of BeginPage and cannot be easily changed after drawing
starts, when compared with other devices.

I tried delaying the BeginPage until the first NewPath. (width/height are letter
size values on entry, and reaches the final values only a few drawing
instructions in).

A workaround is to run -sDEVICE=bbox first and then set the dimension with -g
explicitly; otherwise the file is wrongly processed as letter size.

Comment 1 Hin-Tak Leung 2009-11-22 19:08:02 UTC

While looking at this, I wonder why the DSC info is not used for setting the
device width/height at all. The PS file concerned have DSC PageBoundingBox, and
also does a (clip?) path early on in postscript code.

Comment 2 Ray Johnston 2009-12-03 09:54:44 UTC

There is a 'fillpage' procedure that may be a better place to issue the
'BeginPage'.

Comment 3 Hin-Tak Leung 2009-12-03 10:24:59 UTC

Thanks for the tips - I'll give it a try.

Comment 4 Peter Cherepanov 2021-02-14 07:52:59 UTC

Created attachment 20614 [details]
Sample file

This problem still occurs in the current version.
gs -sDEVICE=pxlcolor -o a.pxl a.ps
generates empty Letter-sized file instead of 1000x1000 point page with a black square.