cairoCreate
or the target
surface for the current group as started by the most recent call to
cairoPushGroup
or cairoPushGroupWithContent
.cairoGetGroupTarget(cr)
cairoSurfaceReference
.cr
is already in an error state,
(ie. cairoStatus
!=
CAIRO_STATUS_SUCCESS
).
A nil surface is indicated by cairoSurfaceStatus
!=
CAIRO_STATUS_SUCCESS
. Since 1.2