Description:
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When loading a 1-bit BMP bitmap with gd's imagecreatefrombmp, the resulting image data is corrupted (skewed?). 

Here's a screenshot of the problem: 
https://screenshot.tbspace.de/wjstqfduhnk.png

And here's a test 1-bit bitmap:
https://tbspace.de/content/downloads/042-1rr1.bmp

All other tools I tried (ImageMagick, IrfanView, MS Paint) can open this file just fine, so I think this is a PHP-GD issue. 


Test script:
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<?php
$im = imagecreatefrombmp("042-1rr1.bmp");
imagepng($im);


Expected result:
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Binary data. Write to a .png file with php test.php > test.png and open the .png file in an image viewer. 

Actual result:
--------------
Resulting .png image is skewed/corrupted. 
(see screenshot in description for an example)