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image/png: support interlacing #6293

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@gopherbot

by sinni800:

What steps will reproduce the problem?
If possible, include a link to a program on play.golang.org.
1. http://play.golang.org/p/5lY2fRrLt6
2. Download the attachment png
3. Modify the variable "source" so it points to the png
4. Run

What is the expected output?

Nil error, the image is decoded

What do you see instead?

err: unsupported feature: compression, filter or interlace method

Which compiler are you using (5g, 6g, 8g, gccgo)?

6g, 8g

Which operating system are you using?

Windows, Linux

Which version are you using?  (run 'go version')

Tested on tip and 1.1.2

Please provide any additional information below.

Sorry for the image, being a comic. I will gladly accept an image that has the same
unsupported feature as replacement.

Attachments:

  1. sameshirt.png (20062 bytes)

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