Mixed pixmap creation

[Jonathan Morton]

On Thu, 2010-10-14 at 16:43 +0800, fancy fang wrote:
> Thanks! But,  I still can not understand why Unit Pixmap needs both
> system buffer and driver buffer? In my opinion, Unit Pixmap only needs
> system buffer. Welcome your opinions!

Because the driver needs to see the colour of this pixel, if it
accelerates an operation involving this solid colour.  This is extremely
common, eg. for rendering text the solid colour is combined with a mask
defining the shape of the letters.

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From: Jonathan Morton
      jonathan.morton at movial.com