[whisper]NOTE: I often mix up weather opacity means “fully visible” or “fully invisible”. Is Opacity the same as alpha, or the opposite? Just to be safe, I’m using the word “transparency” instead.[/whisper]
Let’s say you ask for a color, and I hand you 0x52BD86
Assuming you were wanting a “regular” color, I just handed you a nice little bluish color.
However, assuming you wanted a “32 bit” color (that is, including an alpha channel) I just handed you a completely transparent color (0x0052BD86 to be precise), so it really doesn’t matter what the visible color was, it’s still going to be invisible.
That’s why AS3 BitmapData has separate methods “setPixel” and “setPixel32”.
Would it not be better to have the first 8 bits be a “transparency” value, so instead of 0 being invisible and 255 fully visible, flip them, making 0 completely visible, and 255 completely transparent?
That way, if I hand you 0x52BD86, you can basically assume I mean completely visible. Then we won’t even need separate functions for 32 bit colors.
But, this probably goes deeper than AS3, and likely would mean changing the way color is treated throughout the last couple of years, or? Is there any reason they created the alpha bits like that?
