753924 - Scaling with drawImage is slow

Status: UNCONFIRMED

(Core :: Graphics: Canvas2D, defect)

Description

[Grant Galitz]

Attachment: canvas_scale.html

User Agent: Mozilla/5.0 (Macintosh; Intel Mac OS X 10.6; rv:12.0) Gecko/20100101 Firefox/12.0
Build ID: 20120420145725

Steps to reproduce:

Tested scaling with drawImage to scale a white noise blit at 60fps to window.


Actual results:

20 fps cap and full cpu usage.


Expected results:

gpu acceleration should have kicked in to make it fast.

Comment 1

[Grant Galitz]

Firefox will accelerate the other test http://grantgalitz.org/canvas_tests/css_scale.html as it relies on layout acceleration, while canvas_scale won't be accelerated due to drawImage usage.

Comment 2

[Grant Galitz]

Attachment: layout acceleration required for speed in this test

Comment 3

[Benoit Jacob [:bjacob] (mostly away)]

As far as I know we don't do content acceleration on Mac OSX 10.6, but we do on 10.7. Can you try 10.7?

Comment 4

[Grant Galitz]

Did you mean context2d acceleration? Because content html layer acceleration is present for me.

Comment 5

[Benoit Jacob [:bjacob] (mostly away)]

Yes. My understanding is that starting in Firefox 12, on Mac, we use Core Graphics, and my (limited and possibly wrong) understanding is that Core Graphics is hw-accelerated on OSX 10.7.

Comment 6

[Grant Galitz]

huh, then I'll need to test with lion. Somehow though, google chrome managed to pull in acceleration for context2d here though, as it's not a problem there.

Comment 7

[Benoit Jacob [:bjacob] (mostly away)]

Chrome doesn't use Core Graphics, they use Skia with its own GL-accelerated back-end.

Comment 8

[Grant Galitz]

Yeah, I figured that too, though couldn't firefox accelerate with a special gl path too? I'd imagine firefox could do normal gl-acceleration on snow or other OSes for context-2d.

Comment 9

[Benoit Jacob [:bjacob] (mostly away)]

(In reply to Grant Galitz from comment #8)
> Yeah, I figured that too, though couldn't firefox accelerate with a special
> gl path too?

See bug 751418 for enabling Skia+GL.

Comment 10

[Benoit Jacob [:bjacob] (mostly away)]

Joe tells me that we're not actually getting hw accel from Core Graphics at the moment, and that our best path toward content acceleration on Mac is bug 751418.

Comment 11

[Grant Galitz]

Unable to repro as I use OS X 10.8 now.