Bug 694848

Summary: Converting PDF to PNG hangs
Product: Ghostscript Reporter: jakob.pousard
Component: GeneralAssignee: Michael Vrhel <michael.vrhel>
Status: RESOLVED FIXED    
Severity: normal    
Priority: P4    
Version: 9.10   
Hardware: PC   
OS: Windows 7   
Customer: Word Size: ---
Attachments: Test input file

Description jakob.pousard 2013-12-16 07:12:39 UTC 
Created attachment 10463 [details]
Test input file

Converting PDF to png hangs (or extremely slow) using following command line:

"C:\Program Files (x86)\gs\gs9.10\bin\gswin32c.exe" -dSAFER -dBATCH -dNOPROMPT -dNOPAUSE -sDEVICE=png16m -dTextAlphaBits=4 -dGraphicsAlphaBits=4 "-r150x150" -dFirstPage=1 -dLastPage=1 -dUseTrimBox "-sOutputFile=poster.png" "magazine_p1.pdf"

Using the same command line with gs9.05 completes in about 3 seconds with no errors.
Comment 1 Ken Sharp 2013-12-16 07:29:23 UTC 
This seems to me to be the same problem I pointed out before the staff meeting. In gdevp14.c, pdf14_copy_alpha_color() at line 2411 in my code I see:

                            for (k = 0; k < num_comp; ++i) {

Which I believe should be:

                            for (k = 0; k < num_comp; ++k) {


See also bug #694811
Comment 2 jakob.pousard 2013-12-16 07:43:40 UTC 
(In reply to comment #1)
> This seems to me to be the same problem I pointed out before the staff
> meeting. In gdevp14.c, pdf14_copy_alpha_color() at line 2411 in my code I
> see:
> 
>                             for (k = 0; k < num_comp; ++i) {
> 
> Which I believe should be:
> 
>                             for (k = 0; k < num_comp; ++k) {
> 
> 
> See also bug #694811

The comments on bug #694811 says it is only for the pngalpha device. But I'm using the png16m device, mayby it affects all png devices.
Comment 3 Ken Sharp 2013-12-16 07:49:24 UTC 
(In reply to comment #2)

> > See also bug #694811
> 
> The comments on bug #694811 says it is only for the pngalpha device. But I'm
> using the png16m device, mayby it affects all png devices.

The comments say it can be reproduced with the pngalpha device, not that it only affects the pngalpha device. The same effect can be reproduced using the display device and probably any device using an additive colour space.