Bug 66884 – Speed up texImage from BGRA

• Component: New Bugs
• Status: RESOLVED FIXED

[John Bauman]

Speed up texImage from BGRA

[John Bauman]

Created attachment 105056 [details]
Patch

[WebKit Review Bot]

Comment on attachment 105056 [details]
Patch

Attachment 105056 [details] did not pass chromium-ews (chromium-xvfb):
Output: http://queues.webkit.org/results/9488247

[John Bauman]

Created attachment 105059 [details]
Patch

[Nat Duca]

Comment on attachment 105059 [details]
Patch

View in context: https://bugs.webkit.org/attachment.cgi?id=105059&action=review

Wheee! What kind of speed gains does this get (not fps, but for the actual pack fn)?

> Source/WebCore/platform/graphics/GraphicsContext3D.cpp:1152
> +    if (reinterpret_cast<void*>(rowPackingFunc) == reinterpret_cast<void*>(packOneRowOfRGBA8ToRGBA8)) {

As a bystander to this code, it took me a while to figure out what this check was really doing --- might want to preceed this with a comment saying "skip unpacking step if does nothing and unpack directly to the destination"?

[John Bauman]

(In reply to comment #4)
> (From update of attachment 105059 [details])
> View in context: https://bugs.webkit.org/attachment.cgi?id=105059&action=review
> 
> Wheee! What kind of speed gains does this get (not fps, but for the actual pack fn)?
I'm not sure, as the benchmark I was using increased the amount of work that it had this do when I made it faster, but it maybe takes 1/2 to 1/3 of its old time. I know the benchmark scored about 1.5x what it was without the patch.
> 
> > Source/WebCore/platform/graphics/GraphicsContext3D.cpp:1152
> > +    if (reinterpret_cast<void*>(rowPackingFunc) == reinterpret_cast<void*>(packOneRowOfRGBA8ToRGBA8)) {
> 
> As a bystander to this code, it took me a while to figure out what this check was really doing --- might want to preceed this with a comment saying "skip unpacking step if does nothing and unpack directly to the destination"?

Good idea.

[John Bauman]

Created attachment 105201 [details]
Patch

[WebKit Review Bot]

Comment on attachment 105201 [details]
Patch

Attachment 105201 [details] did not pass chromium-ews (chromium-xvfb):
Output: http://queues.webkit.org/results/9495512

New failing tests:
fast/canvas/webgl/tex-image-and-sub-image-2d-with-array-buffer-view.html

[John Bauman]

Created attachment 105207 [details]
Patch

[Kenneth Russell]

Comment on attachment 105207 [details]
Patch

Looks good to me. Did you run the texture-related WebGL conformance tests and layout tests to ensure no accidental regressions?

[John Bauman]

Yeah, they all seem to work.

[Kenneth Russell]

Comment on attachment 105207 [details]
Patch

View in context: https://bugs.webkit.org/attachment.cgi?id=105207&action=review

> Source/WebCore/platform/graphics/GraphicsContext3D.cpp:481
> +        uint32_t rgba = (((bgra >> 16) | (bgra << 16)) & 0x00ff00ff) | (bgra & 0xff00ff00);

Sorry, I just realized that this won't work correctly on big-endian hardware. You can use #if CPU(BIG_ENDIAN) to gate the code (see html/canvas/DataView.cpp); could you please add another arm?

[John Bauman]

Created attachment 105510 [details]
fix big endian

[Kenneth Russell]

Comment on attachment 105510 [details]
fix big endian

Great, thanks. r=me

[WebKit Review Bot]

Comment on attachment 105510 [details]
fix big endian

Clearing flags on attachment: 105510

Committed r94026: <http://trac.webkit.org/changeset/94026>

[WebKit Review Bot]

All reviewed patches have been landed.  Closing bug.