[rust] add example for issue #1716

rust/examples/issue-1716.rs

@@ -0,0 +1,33 @@
+use libnotcurses_sys::*;
+
+const W: u32 = 32;
+const H: u32 = 32;
+
+fn main() {
+    let mut nc = NcDirect::new().expect("couldn’t create ncdirect");
+    nc.check_pixel_support()
+        .expect("failed to check for sixel support");
+
+    // create a purple rectangle
+    let mut buffer = Vec::<u8>::with_capacity(H as usize * W as usize * 4);
+    #[allow(unused_parens)]
+    for _byte in (0..={ H * W }) {
+        buffer.push(190);
+        buffer.push(20);
+        buffer.push(80);
+        buffer.push(255);
+    }
+
+    let vframe1 = NcVisual::from_bgra(&buffer, H, W * 4, W).expect("couldn’t create visual");
+    let voptions = NcVisualOptions::fullsize_pixel_without_plane(0, 0, H, W);
+
+    unsafe {
+        let v = ffi::ncdirectf_render(nc, vframe1, NCBLIT_PIXEL, NCSCALE_NONE, 0, 0);
+        if !v.is_null() {
+            ncdirect_raster_frame(nc, v, NCALIGN_LEFT);
+        }
+    }
+
+    vframe1.destroy();
+    nc.stop().expect("failed to destroy ncdirect context");
+}