1567544 - Canvas SVG issue when using the Context2D "globalCompositeOperation" set to "destination-in"

Status: RESOLVED FIXED

(Core :: Graphics: Canvas2D, defect, P3)

Description

[Édouard Mercier]

Attachment: Firefox-SVG-destination-in-bug.html

User Agent: Mozilla/5.0 (Macintosh; Intel Mac OS X 10_14_5) AppleWebKit/537.36 (KHTML, like Gecko) Chrome/75.0.3770.100 Safari/537.36
Firefox for Android

Steps to reproduce:

Define an HTML5 <canvas>, draw a plain image (i.e. with no transparent pixels) and then draw a SVG image containing some transparent pixels and some opaque pixels (i.e. a mask), with the canvas Context2D ""globalCompositeOperation" set to "destination-in", so as to apply a mask.

Actual results:

The SVG image is drawn as if the Context2D "globalCompositeOperation" were set to its default "source-over" value, and the SVG image simply overwrites the previously drawn image.

This occurs on desktop but also on the Android mobile application "Mozilla Firefox" v68.0.

Expected results:

The SVG image should have behaved like a mask.

I have attached a stand-alone HTML5 file which shows the bug and a work-around by using an intermediate canvas.

Comment 1

[Alice0775 White]

I can reproduce on Nightly70.0a1 windows10.
Edge44.18362.1.0 and Chrome 75.0.3770.142 works as expected

Comment 2

[Alice0775 White]

Firefox 28 works, Firefox 29 broken.

Regression window:
https://hg.mozilla.org/integration/mozilla-inbound/pushloghtml?fromchange=04f5a7e8f14c&tochange=c305df97cbc6

Regressed by: Bug 603488

Comment 3

[BugBot [:suhaib / :marco/ :calixte]]

The priority flag is not set for this bug.
:lsalzman, could you have a look please?

For more information, please visit auto_nag documentation.

Comment 5

[adroitwhiz]

Attachment: Bug 1567544 - set composite op in DrawDirectlyToCanvas

Comment 6

[Pulsebot]

Pushed by [e-mail]:
https://hg.mozilla.org/integration/autoland/rev/1fe5ae0c8768
set composite op in DrawDirectlyToCanvas r=jrmuizel

Comment 7

[Arthur Iakab [arthur_iakab]]

https://hg.mozilla.org/mozilla-central/rev/1fe5ae0c8768