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APNG
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== APNG ==
APNG stands for Animated PNG, an extension to the PNG specification to allow for animated PNG images. Similar to how Animated GIF is an extension of GIF. Create such a thing.
== Project Leader(s) ==
[[User:Andrew|Andrew Smith]] (andrew on [[FAQ|IRC]]) == Project Contributors ==Ben Hearsum - taught me to connect to the cluster using rdesktop, vmware and set up an account for me to compile mozilla on the windows cluster. Mark Paruzel - made two fancy animations for demoing APNG, not up on the web yet. Tom Aratyn - spent a few hours with me trying to solve an inheritance problem. Jeff Mossop - [[IconsForAPNG|Created Icons for Andrew]]
== Project Details ==
The project is broken up into several stages:
1. ('''complete''') Create an [http://wiki.mozilla.org/APNG_Specification extension] to the [http://www.w3.org/TR/PNG/ PNG Specification]. [http://pavlov.net/blog/ Stuart Parmenter] and [http://blog.vlad1.com/ Vladimir Vukićević] did this in around 2004.
2. ('''complete''') Implement the APNG spec into [http://www.libpng.org/pub/png/ libpng]. This was done for libpng 1.2.10 during the summer of 2006. [http://littlesvr.ca/apng/diff/libpng-1.2.10-apng.patch Patch ] available on the [http://littlesvr.ca/apng/ hereAPNG implementation page].
3. ('''current, fall 2006''') Implement the modified libpng into Mozilla.
4. Attempt to get the APNG patch integrated into libpng.
7. Try again.
== Project News ==
- compiled mozilla on slackware
- installed vmware and windows
- installed cygwin
- compiled mozilla on windows
- compiled mozilla on a mac
- attempted to fix a bug in libpng 1.2.12 that caused mozilla on a mac to crash, someone beat me to it
- tried to move things from imgContainerGIF to imgContainer and share that code using inheritance, didn't work
- rather than moving things, copied them instead. will do the inheritance thing later after it works
- made a webage for testing, with a gif, a png and an animated png
- updated the libpng patch to work with 1.2.12
- updated the apng spec and libpng patch with a small change requested by the libpng maintainer
- wondered why it still doesn't work
- spent a few days looking at the gif container to get a better idea of how it works
- fixed imgcontainer and pngdecoder to work with animations
- made some more images for testing
- made the gif decoder use imgcontainer
- removed imgcontainergif and replaced all references to it with imgcontainer
- finished patch, posted in bug 257197, waiting for review
== Links ==
[http://wiki.mozilla.org/APNG_Specification Extension to the PNG spec]
[http://www.w3.org/TR/PNG/ Original PNG Spec]
[http://littlesvr.ca/apng/ APNG Implementation Page]
[http://www.libpng.org/pub/png/ libpng page]
[https://bugzilla.mozilla.org/show_bug.cgi?id=257197 Bug 257197]
[https://bugzilla.mozilla.org/show_bug.cgi?id=257263 Bug 257263]
== End of Project ==
The libpng and mozilla patch are in one file on mozilla's bugzilla: [https://bugzilla.mozilla.org/attachment.cgi?id=245594]
Use a diff viewer to look at it, or the `patch` to apply it to the current (December 2006) Mozilla tree.
Sample images are available at [http://littlesvr.ca/apng/]
