Allegro 4: dirty workaround to prevent pink transparency behavior.
Allegro 4: dirty workaround to prevent pink transparency behavior.

For primitives, using a new custom makeacol2 which replaces pure magenta
(255, 0, 255) color, referred as bright pink, with a quasi-magenta color
(255, 1 255).

For images, replacing magenta-colored pixels on the bitmap with
semi-pure magenta, right after loading it, on the Image constructor.
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