Fix mask usage in image-compositor
This is a fix for #437 (closed)
The commit contains a test-case that reproduces the issue - just build an unpatched version with CFLAGS="-fsanitize=address" and run the "bug-image-compositor"-test.
This is a fix for #437 (closed)
The commit contains a test-case that reproduces the issue - just build an unpatched version with CFLAGS="-fsanitize=address" and run the "bug-image-compositor"-test.