When using CrystalSkull App, the app's rendering often have a vertical and horizontal line.

screen shot of the problem. Color is also incorrect. The color problem seems Bug 886415.

Peter, what do you think?

(In reply to Milan Sreckovic [:milan] from comment #2) > Peter, what do you think? I think this issue was related to bug 894847. https://bugzilla.mozilla.org/show_bug.cgi?id=894847#c2 If we change texture swap of CanvasGL from async to sync, it will become better. http://mxr.mozilla.org/mozilla-central/source/gfx/layers/client/CanvasClient.cpp#123 Because async way couldn't guarantee the buffer synchronization between content and chrome process.

Wait for the needinfo on bug 894847. Sotaro, this only happens when HWC is not available?

Also, is sync texture swap the only way to deal with this?

It happens only on HwComposer rendering. I do not see this on OpenGL rendering. But on OpenGL rendering, performance is too bad(Bug 894847);

This rendering problem might not be related to genlock.

(In reply to Milan Sreckovic [:milan] from comment #5) > Also, is sync texture swap the only way to deal with this? In my opinion, I think sync texture swap for b2g only could be a short-term solution. For long-term solution, we still need to consider buffer management between content and chrome process to guarantee compositor doesn't use the same buffer as content process.

Still can't decide if this is a blocker for 1.2. What is it about CrystalScull app that triggers this? Where else would we expect to see this kind of a problem?

The root cause of the problem seems same as Bug 917444. It is already koi+. By changing "gfx.gralloc.fence-with-readpixels" to true, the problem seems to be fixewd as in Bug 917444 Comment 2. - Bug 917444 - [B2G][Gallery][Edit]Effects only filter part of an image and sometimes both parts incorrectly

Let's aim for koi+, and once we verify the same root cause, we can dupe this bug to 917444.

Diego, we think this is the same as bug 917444 that you have.

(In reply to Sotaro Ikeda [:sotaro] from comment #10) > The root cause of the problem seems same as Bug 917444. It is already koi+. > By changing "gfx.gralloc.fence-with-readpixels" to true, the problem seems > to be fixewd as in Bug 917444 Comment 2. > - Bug 917444 - [B2G][Gallery][Edit]Effects only filter part of an image and > sometimes both parts incorrectly The result for "UpdateTextureSync" or "force readpixel" on content side both could fix the problem because they will wait for a period time for draw calls. But "force readpixel" method may apply to content app which already calls "UpdateTextureSync" and it is not necessary for it.

It is a dup of Bug 917444. And discussion is going on there.