Re: [PATCH v2 0/2] MR6401: uxtheme: Optimize drawing by avoiding unneeded TransparentBlt().

[Paul Gofman (＠gofman)]

v2:
 - use hasDefaultTransparentColour name;
 - use bitfields for hasAlpha and hasDefaultTransparentColour;
 - return early in prepare_alpha();
 - check for the colour being default also for explicitly provided colour.

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https://gitlab.winehq.org/wine/wine/-/merge_requests/6401#note_80904