Canvas2D: Multiple readback operations using getImageData are faster with the willReadFrequently attribute set to true

[coderextreme]

‘’’
Canvas2D: Multiple readback operations using getImageData are faster with the willReadFrequently attribute set to true. See:
x3dom-full.debug.js:21721 Canvas2D: Multiple readback operations using getImageData are faster with the willReadFrequently attribute set to true. See: https://html.spec.whatwg.org/multipage/canvas.html#concept-canvas-will-read-frequently
x3dom.Texture.uploadTextMipmap @ x3dom-full.debug.js:21721
x3dom-full.debug.js:21721 Canvas2D: Multiple readback operations using getImageData are faster with the willReadFrequently attribute set to true. See: https://html.spec.whatwg.org/multipage/canvas.html#concept-canvas-will-read-frequently
x3dom.Texture.uploadTextMipmap @ x3dom-full.debug.js:21721
x3dom-full.debug.js:21721 Canvas2D: Multiple readback operations using getImageData are faster with the willReadFrequently attribute set to true. See: https://html.spec.whatwg.org/multipage/canvas.html#concept-canvas-will-read-frequently
x3dom.Texture.uploadTextMipmap @ x3dom-full.debug.js:21721
x3dom-full.debug.js:21721 Canvas2D: Multiple readback operations using getImageData are faster with the willReadFrequently attribute set to true. See: https://html.spec.whatwg.org/multipage/canvas.html#concept-canvas-will-read-frequently
x3dom.Texture.uploadTextMipmap @ x3dom-full.debug.js:21721
x3dom-full.debug.js:21721 Canvas2D: Multiple readback operations using getImageData are faster with the willReadFrequently attribute set to true. See: https://html.spec.whatwg.org/multipage/canvas.html#concept-canvas-will-read-frequently
x3dom.Texture.uploadTextMipmap @ x3dom-full.debug.js:21721
x3dom-full.debug.js:21721 Canvas2D: Multiple readback operations using getImageData are faster with the willReadFrequently attribute set to true. See: https://html.spec.whatwg.org/multipage/canvas.html#concept-canvas-will-read-frequently
x3dom.Texture.uploadTextMipmap @ x3dom-full.debug.js:21721
x3dom-full.debug.js:21721 Canvas2D: Multiple readback operations using getImageData are faster with the willReadFrequently attribute set to true. See: https://html.spec.whatwg.org/multipage/canvas.html#concept-canvas-will-read-frequently
x3dom.Texture.uploadTextMipmap @ x3dom-full.debug.js:21721
x3dom-full.debug.js:21721 Canvas2D: Multiple readback operations using getImageData are faster with the willReadFrequently attribute set to true. See: https://html.spec.whatwg.org/multipage/canvas.html#concept-canvas-will-read-frequently
x3dom.Texture.uploadTextMipmap @ x3dom-full.debug.js:21721
x3dom-full.debug.js:21721 Canvas2D: Multiple readback operations using getImageData are faster with the willReadFrequently attribute set to true. See: https://html.spec.whatwg.org/multipage/canvas.html#concept-canvas-will-read-frequently
‘’’

[andreasplesch]

Thanks,

x3dom/src/Texture.js

Line 875 in 434365a

gl.texImage2D( this.type, level++, this.format, this.format, gl.UNSIGNED_BYTE, ctx2d.getImageData( 0, 0, w2, h2 ) );

seems the only place where getImageData is called, for setting up rendering Text. It is called rarely, eg. not every frame.

See https://developer.mozilla.org/en-US/docs/Web/API/HTMLCanvasElement/getContext#willreadfrequently

Sounds like it trades off memory vs. performance. Probably not applicable here.

[coderextreme]

Joe's animation panel (choice of animation in as Texts) is not showing up in x3dom. I'll ask him to provide a copy to x3dom github. Thanks, Joe.

…

On Wed, Jul 12, 2023 at 3:28 PM Andreas Plesch ***@***.***> wrote: Thanks, https://github.com/x3dom/x3dom/blob/434365a4bf0d52ddf1ee2d03c22d755bdbe64a5b/src/Texture.js#L875 seems the only place where getImageData is called, for setting up rendering Text. It is called rarely, eg. not every frame. See https://developer.mozilla.org/en-US/docs/Web/API/HTMLCanvasElement/getContext#willreadfrequently Sounds like it trades off memory vs. performance. Probably not applicable here. — Reply to this email directly, view it on GitHub <#1282 (comment)>, or unsubscribe <https://github.com/notifications/unsubscribe-auth/AAFMJ5ZKH4JZ5E2PIAN6663XP4CFXANCNFSM6AAAAAA2HRQV7M> . You are receiving this because you authored the thread.Message ID: ***@***.***>

[coderextreme]

Here's a picture of what's happening: X3DOM above, X_ITE below (the middle one). [image: image.png]

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On Wed, Jul 12, 2023 at 4:06 PM John Carlson ***@***.***> wrote: Joe's animation panel (choice of animation in as Texts) is not showing up in x3dom. I'll ask him to provide a copy to x3dom github. Thanks, Joe. On Wed, Jul 12, 2023 at 3:28 PM Andreas Plesch ***@***.***> wrote: > Thanks, > > > https://github.com/x3dom/x3dom/blob/434365a4bf0d52ddf1ee2d03c22d755bdbe64a5b/src/Texture.js#L875 > > seems the only place where getImageData is called, for setting up > rendering Text. It is called rarely, eg. not every frame. > > See > https://developer.mozilla.org/en-US/docs/Web/API/HTMLCanvasElement/getContext#willreadfrequently > > Sounds like it trades off memory vs. performance. Probably not applicable > here. > > — > Reply to this email directly, view it on GitHub > <#1282 (comment)>, or > unsubscribe > <https://github.com/notifications/unsubscribe-auth/AAFMJ5ZKH4JZ5E2PIAN6663XP4CFXANCNFSM6AAAAAA2HRQV7M> > . > You are receiving this because you authored the thread.Message ID: > ***@***.***> >

[andreasplesch]

Thanks. The picture did not make it.

https://www.web3d.org/x3d/content/examples/HumanoidAnimation/Skin/BoxMan4AnimationPanelX3dom.xhtml

seems to work. Is the same panel ?

[coderextreme]

Yeah, works okay for me too. Look at the console in Chrome or Edge. John

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On Wed, Jul 12, 2023 at 6:33 PM Andreas Plesch ***@***.***> wrote: Thanks. The picture did make it. https://www.web3d.org/x3d/content/examples/HumanoidAnimation/Skin/BoxMan4AnimationPanelX3dom.xhtml seems to work. Is the same panel ? — Reply to this email directly, view it on GitHub <#1282 (comment)>, or unsubscribe <https://github.com/notifications/unsubscribe-auth/AAFMJ5ZGRBJGMCKR6PNAHLTXP4X3LANCNFSM6AAAAAA2HRQV7M> . You are receiving this because you authored the thread.Message ID: ***@***.***>

[coderextreme]

What I mean with the picture is this example in X3DOM (on top) does not match the menu below in X_ITE (below). I will ask Joe if I can release the model. John

…

On Wed, Jul 12, 2023 at 4:20 PM John Carlson ***@***.***> wrote: Here's a picture of what's happening: X3DOM above, X_ITE below (the middle one). [image: image.png] On Wed, Jul 12, 2023 at 4:06 PM John Carlson ***@***.***> wrote: > Joe's animation panel (choice of animation in as Texts) is not showing up > in x3dom. I'll ask him to provide a copy to x3dom github. > > Thanks, Joe. > > On Wed, Jul 12, 2023 at 3:28 PM Andreas Plesch ***@***.***> > wrote: > >> Thanks, >> >> >> https://github.com/x3dom/x3dom/blob/434365a4bf0d52ddf1ee2d03c22d755bdbe64a5b/src/Texture.js#L875 >> >> seems the only place where getImageData is called, for setting up >> rendering Text. It is called rarely, eg. not every frame. >> >> See >> https://developer.mozilla.org/en-US/docs/Web/API/HTMLCanvasElement/getContext#willreadfrequently >> >> Sounds like it trades off memory vs. performance. Probably not >> applicable here. >> >> — >> Reply to this email directly, view it on GitHub >> <#1282 (comment)>, >> or unsubscribe >> <https://github.com/notifications/unsubscribe-auth/AAFMJ5ZKH4JZ5E2PIAN6663XP4CFXANCNFSM6AAAAAA2HRQV7M> >> . >> You are receiving this because you authored the thread.Message ID: >> ***@***.***> >> >

[andreasplesch]

The picture did not make it.

[coderextreme]

My understanding I’m still talking about the same picture I thought you said did make it? A typo?

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On Thu, Jul 13, 2023 at 5:28 PM Andreas Plesch ***@***.***> wrote: The picture did not make it. — Reply to this email directly, view it on GitHub <#1282 (comment)>, or unsubscribe <https://github.com/notifications/unsubscribe-auth/AAFMJ525WZBZ7L2HF3CDGODXQBZAVANCNFSM6AAAAAA2HRQV7M> . You are receiving this because you authored the thread.Message ID: ***@***.***>

[andreasplesch]

Yes, it was a typo.