Symbian ask what is the role of the mask?

            


Symbian ask what is the role of the mask? The book says, Bitman a place is transparent, the background does not need to be redrawn, but I still do not understand what the role of masks in there ah?
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Brothers wanted symbian test it?
Email me, juelian77 @ tom.com
Look forward to your reply
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Mask decided to draw the bitmap in which pixels.
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bitmap is square, if you want a round or other irregular effects, you need to have a mask that tells the system where no painting, only those black (white) color of the place drawn enough, it I realized this picture of transparency.
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Upstairs brothers, I still do not understand,
If you want a round or other irregular effects, we need to have those places tell the system without a mask painted
If it is a circle, then, what do not draw ah?

Why only the black and white picture section, draw out can achieve transparent Azerbaijan?

Thank you!
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Place a black transparent, opaque white areas (displayed), other colors translucent ~
It seems to be so!
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Other colors translucent ??
I have not tried this
This is not because the mask
Set C2 1 and 0 indicates black and white
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Mean to tell the system when working with bitmap textures only black pixels corresponding to the mask, not painted white, so the place would be masked white background color, it would be tantamount to transparent
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Sdk example look inside the mask of like :)

In fact, a box of pictures, the future is what you want the picture, the background is transparent.

So inside the mask, black and white logo out just fine.
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In fact on the word
Just copy the black part of the system to the screen
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Or the classic final