One draw call for all screen area outlines instead of one per line. (Two for retina displays) One draw call for area split line instead of two. En/Disable GL_BLEND once for area join arrow instead of twice.
One draw call for all screen area outlines instead of one per line. (Two for retina displays) One draw call for area split line instead of two. En/Disable GL_BLEND once for area join arrow instead of twice.