Closed Bug 330478 Opened 19 years ago Closed 19 years ago

Canvas drawImage corrupts PNGs with indexed transparency

Categories

(Firefox :: General, defect)

x86
Windows XP
defect
Not set
major

Tracking

()

RESOLVED DUPLICATE of bug 320510

People

(Reporter: brothererryn, Unassigned)

Details

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(2 files)

User-Agent:       Mozilla/5.0 (Windows; U; Windows NT 5.1; en-US; rv:1.8.0.1) Gecko/20060111 Firefox/1.5.0.1
Build Identifier: Mozilla/5.0 (Windows; U; Windows NT 5.1; en-US; rv:1.8.0.1) Gecko/20060111 Firefox/1.5.0.1

Attempting to draw any indexed transparent PNG onto a canvas results in the image being horribly corrupted. Any method of "grabbing" the source image or drawing it on the canvas has the same effect. Non-transparent indexed PNGs draw correctly.

Reproducible: Always

Steps to Reproduce:
1. Draw a transparent indexed PNG onto a canvas by any method.
2. Observe the corrupted image.

Actual Results:  
Image is corrupted.

Expected Results:  
The image should have been drawn correctly.

I'll attach a test case.
Attached file A simple test case.
Also seems to be an issue with transparent GIFs, but I haven't tested this as thoroughly.
For some reason I didn't see the dupe when I searched originally. I'll clean up my own mess, but the test case might still be useful.

*** This bug has been marked as a duplicate of 320510 ***
Status: UNCONFIRMED → RESOLVED
Closed: 19 years ago
Resolution: --- → DUPLICATE
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