Convert cairo canvas read_bits() to pixman
Convert cairo canvas read_bits() to pixman

Fantu/spice-common,freedesktop-unofficial-mirror/spice__spice-common,elmarco/spice-common,Fantu/spice-common,SPICE/spice-common,fgouget/spice-common,freedesktop-unofficial-mirror/spice__spice-common,SPICE/spice-common,elmarco/spice-common,freedesktop-unofficial-mirror/spice__spice-common,elmarco/spice-common,Fantu/spice-common,Fantu/spice-common,fgouget/spice-common,freedesktop-unofficial-mirror/spice__spice-common,fgouget/spice-common,elmarco/spice-common,SPICE/spice-common,fgouget/spice-common