543642 - SVG Text in Firefox with Drop Shadow Filter applies has strange artefact around the text.

Status: RESOLVED DUPLICATE of bug 471457

(Core :: SVG, defect)

Description

[jamesm]

User-Agent:       Mozilla/5.0 (X11; U; Linux i686; en-US; rv:1.9.2) Gecko/20100115 Firefox/3.6
Build Identifier: Mozilla/5.0 (X11; U; Linux i686; en-US; rv:1.9.2) Gecko/20100115 Firefox/3.6

SVG text rendered with a drop shadow filter (created using an SVG filter, see the XML file in the URL) causes some graphic anomalies.

Solid colours such as green and blue are fine, but other colours such as red and white cause artefacts to appear around some corners. This appears to be caused by
the anti-aliasing of the fonts.

Reproducible: Always

Steps to Reproduce:
1. Add an SVG Text element to an SVG document
2. Create a filter that causes a drop shadow to appear
3. Artefacts appear.
Actual Results:  
Small amount of artefacts appear around the edges of the fonts

Expected Results:  
Solid colours on the text with a drop shadow beneath it

about:buildconfig

Source

Built from http://hg.mozilla.org/releases/mozilla-1.9.2/rev/448d0d2d310c
Build platform
target
i686-pc-linux-gnu

Build tools
Compiler 	Version 	Compiler flags
/tools/gcc/bin/gcc 	gcc version 4.1.2 20061011 (Red Hat 4.1.1-29) 	-Wall -W -Wno-unused -Wpointer-arith -Wcast-align -W -Wno-long-long -pedantic -gstabs+ -fno-strict-aliasing -pthread -pipe -DNDEBUG -DTRIMMED -Os -freorder-blocks -fno-reorder-functions -finline-limit=50
/tools/gcc/bin/g++ 	gcc version 4.1.2 20061011 (Red Hat 4.1.1-29) 	-fno-rtti -fno-exceptions -Wall -Wpointer-arith -Woverloaded-virtual -Wsynth -Wno-ctor-dtor-privacy -Wno-non-virtual-dtor -Wcast-align -Wno-invalid-offsetof -Wno-long-long -pedantic -gstabs+ -fno-strict-aliasing -fshort-wchar -pthread -pipe -DNDEBUG -DTRIMMED -Os -freorder-blocks -fno-reorder-functions -finline-limit=50

Configure arguments
--enable-application=browser --enable-optimize --enable-update-channel=release --enable-update-packaging --disable-debug --enable-tests --enable-official-branding

Comment 1

[Robert Longson [:longsonr]]

Please attach a testcase using the Add an attachment link above and ideally a screenshot of what you see (the link provided in the URL does not work).

Comment 2

[Robert Longson [:longsonr]]

I wonder if this is the same issue as bug 471457

Comment 3

[jamesm]

Attachment: Test Case - SVG document displaying artefacting.

Comment 4

[jamesm]

Attachment: Actual output of the browser displaying the SVG.

Comment 5

[jamesm]

I didn't notice bug 471457 when I searched for this problem; it looks like it is the same problem that I'm having here.

Thanks!