David Heuschmann a9455cf03d image/bmp: support v4 and v5 info header versions ...

Decode BITMAPV4INFOHEADER and BITMAPV5INFOHEADER in addition to
BITMAPINFOHEADER and check if any of their features are used. If this is
not the case, the bmp can be decoded as if it had the BITMAPINFOHEADER.
Otherwise an ErrUnsupported is returned.

The colormap.bmp and yellow_rose-small-v5.bmp files were generated using
imagemagick using the following conversions:

convert video-001.bmp -depth 8 -palette colormap.bmp
convert yellow_rose-small.bmp -format BMP5 yellow_rose-small-v5.bmp

The corresponding png files were created using imagemagick convert
without any arguments.

Fixes golang/go#27767

Change-Id: I5c0138b231c68132d39a29c71b61faa546921511
Reviewed-on: https://go-review.googlesource.com/c/141799
Reviewed-by: Nigel Tao <nigeltao@golang.org>
Run-TryBot: Nigel Tao <nigeltao@golang.org>
TryBot-Result: Gobot Gobot <gobot@golang.org>

2018-10-23 22:58:01 +00:00

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