307717 - gradients on text elements wrong when using currentTranslate/Scale

Status: RESOLVED WONTFIX

(Core :: SVG, defect)

Description

[Holger Will]

changing currentTranslate/Scale causes gradients applied to text elements, to be
scale / translated incorrectly.( this is just a guess: it seems
currentTranslate/Scale are applied twice somehow )

Comment 1

[Holger Will]

Attachment: testcase

in this example, currentScale is set to 0.5, the gradient on the text seems to
fill only 1/2 of the text.

Comment 2

[Scooter Morris]

I can't reproduce this bug on a current (nightly) build.  What build are you
using, Holger?

Comment 3

[Holger Will]

i was testing with 
Mozilla/5.0 (Windows; U; Windows NT 5.1; en-US; rv:1.9a1) Gecko/20050907
Firefox/1.6a1
and now i tested with 
1.5 beta 1

i see this on the trunk and the branch, i will upload a screenshot soon.

Comment 4

[Holger Will]

Attachment: screenshot of testcase

Comment 5

[Holger Will]

Attachment: screenshot 2

setting currentScale to 0.25 shows it more clearly...

Comment 6

[Holger Will]

this seems not directly connected to currentScale/Translate , 
i see the same problem here,

http://www.w3.org/TR/SVG/images/filters/feComponentTransfer.svg

i know its not connected to filters, the text identity is filled with the same
gradient as the top rect. does this look correct in your build ?

Comment 7

[Holger Will]

Attachment: screenshot of the w3c example

notice the gradient on the text starts with green turns blue and finally black.

Comment 8

[Holger Will]

Attachment: screenshot of the w3c example after translation

after translating the image to the right, the gradient on the text starts with
red turns green, then blue, then black, but its much shorter then the gradient
on the rect.

Comment 9

[Scooter Morris]

I can't reproduce this on Linux/Cairo, so I suspect that we have a GDIPlus
problem .  I don't have a Windows/GDI build environment, so I'll take a look and
see if anything jumps out at me, but I really can't debug this one very easily.

Comment 10

[Holger Will]

confirming its a GDI issue, just tested on linux and it looks good.

this bug is not only connected to currentTranslate/Scale ,
but also changes to the viewBox and viewport causes the gradient to "change". 

additionally ive tested some older builds, and its allready there for a long time,
sorry for not spotting this earlier ;-)

if you have any idea how i could help track down the bug, just let me know...

Comment 11

[Scooter Morris]

Holger, thanks for the offer.  I'm cc'ing tor on this bug since he did the
GDIPlus gradient code, so perhaps he has an idea.  I'll walk through the GDIPlus
code and see if anything jumps out at me.

Comment 12

[Holger Will]

could this be connected to the patch for bug #291785 ?

Comment 13

[Holger Will]

*** Bug 309168 has been marked as a duplicate of this bug. ***

Comment 14

[Jonathan Watt [:jwatt]]

Marking wontfix. We have no plans to continue development of the GDI+ backend.