Bug 689422

Summary:	Does not draw anything in a given pdf
Product:	Ghostscript	Reporter:	Albert Astals Cid <aacid>
Component:	PDF Interpreter	Assignee:	Michael Vrhel <michael.vrhel>
Status:	RESOLVED FIXED
Severity:	normal
Priority:	P3
Version:	0.00
Hardware:	PC
OS:	Linux
Customer:		Word Size:	---
Attachments:	The said pdf AR7.jpg GS860.jpg rgb20x20.ppm gray20x20.pgm

Description Albert Astals Cid 2007-08-27 13:54:15 UTC

With the pdf i'm going to attach GPL Ghostscript SVN PRE-RELEASE 8.61 
(2007-08-02) that comes with ubuntu developer version draws an empty page that 
is wrong.

Comment 1 Albert Astals Cid 2007-08-27 13:54:44 UTC

Created attachment 3319 [details]
The said pdf

Comment 2 Marcos H. Woehrmann 2007-08-27 16:46:37 UTC

With gshead (r8208) and -sDEVICE=ppmraw I get an image; it's not correct, but
it's not blank.

Comment 3 Ray Johnston 2007-08-28 10:25:46 UTC

Created attachment 3320 [details]
AR7.jpg

Image generated by Adobe Acrobat Reader 7

Comment 4 Ray Johnston 2007-08-28 10:26:32 UTC

Created attachment 3321 [details]
GS860.jpg

Image generated by Ghostscript 8.60

Comment 5 Ray Johnston 2007-08-28 10:47:48 UTC

Note ignore the border lines on the JPEG images -- they are a result of
manual cropping of screen snapshots.

The problem is in a rectangle that is filled with a PatternType 1 that
is filled with an DeviceRGB Image (res5) that has an SMask (a DeviceGray
Image -- object 3 0).

The GS results looks like the SMask is being ignored since the part of the
SMask that overlays the red triangle is gray (which should lighten the
red toward white) and the lower triangle of the SMask is black which should
make that part of the 'red/black' transparent (so it shows as white).

This is a nice simple example. Thanks to the submitter for such a simple case.

I've extracted the RGB image and the SMask and attached them as ppm and pgm
files respectively.

Comment 6 Ray Johnston 2007-08-28 10:48:38 UTC

Created attachment 3322 [details]
rgb20x20.ppm

Comment 7 Ray Johnston 2007-08-28 10:49:02 UTC

Created attachment 3323 [details]
gray20x20.pgm

Comment 8 leonardo 2008-03-09 11:23:41 UTC

Changing assigment since I work in this area.

Comment 9 leonardo 2008-10-28 08:36:28 UTC

Changing assignment to Michael since he wants to work on transparency.

Comment 10 Michael Vrhel 2009-01-07 15:37:52 UTC

Verified that this is a transparency issue and does not work correctly with 
the softmask branch.  Upon inspection I see that this has a knockout 
transparency group.  I suspect that is where the problem lies as it is the 
first one I have run across.

Comment 11 Michael Vrhel 2009-02-16 20:21:14 UTC

This currently renders properly with the soft mask branch.

Comment 12 Michael Vrhel 2009-04-28 15:14:17 UTC

Fixed with merge of soft mask branch