Dots Per Inch (aka Pixels Per Inch)
Deprecated: This function used to set a global default DPI. However, it only worked if it was called before any #RsvgHandle objects had been created; it would not work after that. To avoid global mutable state, please use rsvg_handle_set_dpi() instead.
2.8
Do not use this function. Create an #RsvgHandle and call rsvg_handle_set_dpi() on it instead.