320634 - canvas draw images with alpha channels areas as black

Status: RESOLVED WORKSFORME

(Core :: Graphics: Canvas2D, defect)

Description

[Anand Aiyer]

User-Agent:       Mozilla/5.0 (Windows; U; Windows NT 5.1; en-US; rv:1.8) Gecko/20051111 Firefox/1.5
Build Identifier: Mozilla/5.0 (Windows; U; Windows NT 5.1; en-US; rv:1.8) Gecko/20051111 Firefox/1.5

The canvas tag draws images with alpha channels, the are which contains alpha information is always considered black.

Reproducible: Always

Steps to Reproduce:

Comment 1

[Steve England [:stevee]]

Reporter, can you attach a testcase or provide an URL that shows this? thanks.

Comment 2

[Anand Aiyer]

Attachment: testcase

It occurs only in an isolated case, looked at it numerous times and I can't seem to find out why it is causing a problem here and not any other time.

Comment 3

[Anand Aiyer]

The only happens if the canvas tag is in a XBL element and is updated AFTER the XBL element has been rendered onto the screen. Something to do with the ImageFrame?

Comment 4

[Nickolay_Ponomarev]

What is the expected behavior with the testcase? When loading it (as content) on Fx 1.5.0.7 as well as on Fx2, the first row has dark borders, whereas current Minefield build draws two rows looking the same, the second one is shifted right a little.

Comment 5

[Joe Drew (not getting mail)]

Yeah - I'm gonna call this WFM on current trunk.