Bug 688553

Summary:	A poor grid fitting when stems conflict
Product:	Ghostscript	Reporter:	leonardo <leonardo>
Component:	Graphics Library	Assignee:	leonardo <leonardo>
Status:	NOTIFIED FIXED
Severity:	normal
Priority:	P4
Version:	master
Hardware:	PC
OS:	Windows XP
Customer:		Word Size:	---
Attachments:	KozukaB-ILEmbed-1.pdf 5.bmp.zip patch.txt

Description leonardo 2006-02-10 15:05:55 UTC

A bad gridd fitting happens if two stems have a common boundary, and that 
boundary has a lower alignment strenth, and each stem induces a different 
coordinate. Happens with KozukaB-ILEmbed.pdf when rendering wih patch7 of the 
bug 687654.

Comment 1 leonardo 2006-02-10 15:07:33 UTC

Created attachment 2030 [details]
KozukaB-ILEmbed-1.pdf

A simplified test case. Horizontal stems in 5 and 7 get different width due to
an alignment conflict in 5.

Comment 2 leonardo 2006-02-10 15:11:44 UTC

Created attachment 2031 [details]
5.bmp.zip

A visual trace diagram which demonstrates the effect. The upper horisontal arm
is controlled by hint[2] and hint[3]. The lower boundary gets a conflict, and
the upper coordinate is being choosen randomly. Must choose those, which
corresponds to the longer stem.

Comment 3 leonardo 2006-02-11 03:23:11 UTC

Created attachment 2032 [details]
patch.txt

A suggested patch is being tested.

Comment 4 leonardo 2006-02-12 16:18:52 UTC

Patch to HEAD :
http://ghostscript.com/pipermail/gs-cvs/2006-February/006347.html

This patch also fixes the bug 687654.