gs_cairo->cairo_pattern_add_color_stop_rgba (gradient, 0.0, redIPS, greenIPS, blueIPS, alphaIPS);
gs_cairo->cairo_pattern_add_color_stop_rgba (gradient, 1.0, redDPS, greenDPS, blueDPS, alphaDPS);
// Fill the rectangle with this pattern.
gs_cairo->cairo_set_source(m_cairo, gradient);
gs_cairo->cairo_pattern_add_color_stop_rgba (gradient, 0.0, redIPS, greenIPS, blueIPS, alphaIPS);
gs_cairo->cairo_pattern_add_color_stop_rgba (gradient, 1.0, redDPS, greenDPS, blueDPS, alphaDPS);
// Fill the rectangle with this pattern.
gs_cairo->cairo_set_source(m_cairo, gradient);