setDrawingBufferSize method
Implementation
void setDrawingBufferSize(double width, double height, double pixelRatio) {
_width = width;
_height = height;
_pixelRatio = pixelRatio;
print(" WebGLRenderer setDrawingBufferSize ");
// _canvas.width = Math.floor( width * pixelRatio );
// _canvas.height = Math.floor( height * pixelRatio );
setViewport(0, 0, width, height);
}