Sets the source pattern within cr to a translucent color.
This color will then be used for any subsequent drawing
operation until a new source pattern is set.
The color and alpha components are floating point numbers in
the range 0 to 1. If the values passed in are outside that
range, they will be clamped.
The default source pattern is opaque black, (that is, it is
equivalent to setSourceRGBA(0.0, 0.0, 0.0, 1.0)).
Sets the source pattern within cr to a translucent color. This color will then be used for any subsequent drawing operation until a new source pattern is set.
The color and alpha components are floating point numbers in the range 0 to 1. If the values passed in are outside that range, they will be clamped.
The default source pattern is opaque black, (that is, it is equivalent to setSourceRGBA(0.0, 0.0, 0.0, 1.0)).