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//! Legacy C API for setting a default DPI (dots per inch = DPI).
//!
//! There are two deprecated functions, `rsvg_set_default_dpi` and
//! `rsvg_set_default_dpi_x_y`, which set global values for the default DPI to be used
//! with `RsvgHandle`. In turn, `RsvgHandle` assumes that when its own DPI value is set
//! to `0.0` (which is in fact its default), it will fall back to the global DPI.
//! This is clearly not thread-safe, but it is the legacy behavior.
//! This module encapsulates that behavior so that the `rsvg_internals` crate
//! can always have immutable DPI values as intended.
// This is configurable at runtime
const DEFAULT_DPI_X: f64 = 90.0;
const DEFAULT_DPI_Y: f64 = 90.0;
static mut DPI_X: f64 = DEFAULT_DPI_X;
static mut DPI_Y: f64 = DEFAULT_DPI_Y;
#[derive(Debug, Copy, Clone, Default)]
pub(crate) struct Dpi {
x: f64,
y: f64,
}
impl Dpi {
pub(crate) fn new(x: f64, y: f64) -> Dpi {
Dpi { x, y }
pub(crate) fn x(&self) -> f64 {
if self.x <= 0.0 {
unsafe { DPI_X }
} else {
self.x
pub(crate) fn y(&self) -> f64 {
if self.y <= 0.0 {
unsafe { DPI_Y }
self.y
#[no_mangle]
pub unsafe extern "C" fn rsvg_set_default_dpi_x_y(dpi_x: libc::c_double, dpi_y: libc::c_double) {
if dpi_x <= 0.0 {
DPI_X = DEFAULT_DPI_X;
DPI_X = dpi_x;
if dpi_y <= 0.0 {
DPI_Y = DEFAULT_DPI_Y;
DPI_Y = dpi_y;
pub unsafe extern "C" fn rsvg_set_default_dpi(dpi: libc::c_double) {
rsvg_set_default_dpi_x_y(dpi, dpi);