Add draw_qr

examples/image/main.rs

@@ -6,6 +6,7 @@
 //! However, to keep the example simple, we instead enable std. It significantly
 //! increases the binary size but it's good enough for simple apps.
 
+#![allow(static_mut_refs)]
 #![no_main]
 use firefly_rust as ff;
 use std::cell::OnceCell;

src/graphics/bindings.rs

@@ -88,6 +88,7 @@ extern {
         y: i32,
         color: i32,
     );
+    pub(crate) fn draw_qr(ptr: u32, len: u32, x: i32, y: i32, black: i32, white: i32);
     pub(crate) fn draw_sub_image(
         ptr: u32,
         len: u32,

src/graphics/funcs.rs

@@ -163,6 +163,15 @@ pub fn draw_text(t: &str, f: &Font, p: Point, c: Color) {
     }
 }
 
+/// Render a QR code for the given text.
+pub fn draw_qr(t: &str, p: Point, black: Color, white: Color) {
+    let ptr = t.as_ptr();
+    let len = t.len();
+    unsafe {
+        b::draw_qr(ptr as u32, len as u32, p.x, p.y, black.into(), white.into());
+    }
+}
+
 /// Render an image using the given colors.
 pub fn draw_image(i: &Image, p: Point) {
     let ptr = i.raw.as_ptr();