544102 - Optimize setting fill and stroke color in cairo quartz backend

Status: NEW

(Core :: Graphics, defect)

Description

[Jeff Muizelaar [:jrmuizel]]

We spend more time than necessary in:

CGContextSetRGBStrokeColor ();
CGContextSetRGBFillColor ();

When these are called they construct a new CGColorSpace and compare the color components with old fill/stroke color. If the components aren't equal then they construct a new CGColor and set that using CGContextSet(Stroke/Fill)ColorWithColor.

Further we call both functions each time we call _cairo_quartz_setup_source.

The simplest thing we can do here is avoid calling both in _cairo_quartz_setup_source.

The ideal thing would be to take advantage of the fact that set_source_rgb already does a comparison of the colors and have it communicate source changes to the backend instead of passing all the state into the _fill()/_stroke() functions. Then we could keep a DeviceRGB color space around and construct a new CGColor everytime the source pattern changes.