This piece of code (drawing on an HSV color wheel):


         imaging::Color4f hsv = color::rgb::to_hsv(color);

         int W = diameter / 2;
         int H = diameter / 2;

         fl_push_matrix();

         // Position at center of circle
         fl_translate(x() + W, y() + H);

         // Rotate base on hue
         fl_rotate(15.0 + hsv.r * 360.0f);

         // Scale based on saturation
         fl_scale(hsv.g * 0.375f, hsv.g * 0.375);

         fl_color(r, g, b);

         fl_begin_points();
         fl_vertex(0, diameter);
         fl_end_points();

         fl_pop_matrix();

returns:

error in cairo_matrix_invert

on Linux.


On Windows, it draws just fine and previously (before Cairo was the
default drawing method for fltk1.4 it was also ok).  Any ideas how to
further debug it or what might be wrong?

--
Gonzalo Garramuño