409211 - low quality svg renderization for native svg player on firefox 2 for windows

Status: RESOLVED WORKSFORME

(Core :: SVG, defect)

Description

[Maurizio Migliore]

User-Agent:       Mozilla/5.0 (Windows; U; Windows NT 5.1; it; rv:1.8.1.11) Gecko/20071127 Firefox/2.0.0.11
Build Identifier: Mozilla/5.0 (Windows; U; Windows NT 5.1; it; rv:1.8.1.11) Gecko/20071127 Firefox/2.0.0.11

My SVG is a web client/server application for Maps management.
It is well rendered by IE (with adobe svg plugin 3.x) and firefox on linux, but on windows (and on mac) I obtain low quality renderization (without errors).
To make you understand, the quality difference is similar (if not the same) to the difference beetwen low and high Adobe plugin's quality (both for images and text).

I've tried to set image-rendering and text-rendering svg properties, but they don't take effects (cause Firefox do not supports them I think).

Also, I found some differences in about:buildconfig output.
In the Firefox-linux case I obtain:

  about:buildconfig


    Build platform

target
i686-pc-linux-gnu


    Build tools

Compiler 	Version 	Compiler flags
gcc 	gcc version 4.1.2 20070925 (Red Hat 4.1.2-27) 	-Wall -W -Wno-unused
-Wpointer-arith -Wcast-align -Wno-long-long -pedantic -pthread -pipe
c++ 	gcc version 4.1.2 20070925 (Red Hat 4.1.2-27) 	-fno-rtti
-fno-exceptions -Wall -Wconversion -Wpointer-arith -Wcast-align
-Woverloaded-virtual -Wsynth -Wno-ctor-dtor-privacy
-Wno-non-virtual-dtor -Wno-long-long -pedantic -fshort-wchar -pthread -pipe


    Configure arguments

--enable-application=browser --prefix=/usr --libdir=/usr/lib
--with-system-nspr --with-system-nss --with-system-jpeg
--with-system-zlib --with-system-png --with-pthreads --disable-tests
--disable-debug --disable-installer '--enable-optimize=-Os -g -pipe
-Wp,-D_FORTIFY_SOURCE=2 -fexceptions -fstack-protector
--param=ssp-buffer-size=4 -m32 -march=i386 -mtune=generic
-fasynchronous-unwind-tables' --enable-xinerama
--enable-default-toolkit=gtk2 --disable-xprint --disable-strip
--enable-pango --enable-system-cairo --enable-svg --enable-canvas
--enable-official-branding
 

NOTE --enable-optimize=-Os -g -pipe-Wp


Else, for Firefox-win ...

about:buildconfig

Build platform
target
i586-pc-msvc

Build tools
Compiler 	Version 	Compiler flags
$(CYGWIN_WRAPPER) cl 	12.00.8804 	-TC -nologo -W3 -Gy -Fd$(PDBFILE)
$(CYGWIN_WRAPPER) cl 	12.00.8804 	-TP -nologo -W3 -Gy -Fd$(PDBFILE)

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

NOTE --enable-optimize 

How can I set better quality?

Reproducible: Always

Steps to Reproduce:
1.
2.
3.

Comment 1

[Jeremy Lea]

You need to attach an example of the SVG file to this bug, or at least give a URL.  If you can, you should also attach PNGs of the rendering under Linux and Windows/OS X, with zoomed areas showing the difference in rendering.  As it stands, this is not a bug report, only a complaint.

Otherwise this bug should be marked INVALID.

Comment 2

[Maurizio Migliore]

Attachment: Firefox linux full image

Comment 3

[Maurizio Migliore]

Attachment: Firefox linux first zoom to compare with firefox-win-zoom-1.png

Comment 4

[Maurizio Migliore]

Attachment: Firefox linux second zoom to compare with firefox-win-zoom-2.png

Comment 5

[Maurizio Migliore]

Attachment: Firefox win full image to compare with linux full image (Firefox-linux.png)

Comment 6

[Maurizio Migliore]

Attachment: Firefox win first zoom to compare with firefox-linux-zoom-1.png

Comment 7

[Maurizio Migliore]

Attachment: Firefox win second zoom to compare with firefox-linux-zoom-2.png

Comment 8

[Robert Longson [:longsonr]]

So you mean basically that text looks different. What font/font-families are you using? Can you produce a small (less than 1K) svg file that shows the difference and attach it please? 

Have you enabled cleartype on Windows, if not does it make a difference when you do?

If you design a HTML page with the same fonts and view it on Windows/Linux does it show the same differences?

Finally does Firefox 3 (ideally a nightly or if not the new Beta 2) have the same problem? We won't be fixing Firefox 2 but there is still time to address this for Firefox 3.

Comment 9

[Maurizio Migliore]

The difference is not only about text, but including images also.
Enabling cleartype, I obtain a change but characters become illegible.

As requested, I attach an example so you will notice the differences.
Thanks.

Comment 10

[Maurizio Migliore]

Attachment: open the svg with IE (adobe svg plugin 3 or 6) and firefox (native svg player) and notice differences.

Icon and text have less resolution under Firefox than under Explorer

Comment 11

[Robert Longson [:longsonr]]

Attachment: reporters testcase

Comment 12

[Robert Longson [:longsonr]]

Attachment: image for testcase

Comment 13

[Robert Longson [:longsonr]]

Attachment: reporters testcase

Comment 14

[Robert Longson [:longsonr]]

This is basically about applying bilinear resampling on scaled images which we've done for some time now.