[rust] new example issue-1699; issue #1700

- add raqote 2D graphics library as a dev-dependency

rust/Cargo.toml

@@ -39,6 +39,7 @@ serial_test = "^0.5.0"
 serial_test_derive = "^0.5.0"
 
 rand = "^0.8"
+raqote = "0.8.0"
 
 # https://doc.rust-lang.org/cargo/reference/profiles.html
 [profile.dev]

rust/examples/issue-1699.rs

@@ -0,0 +1,33 @@
+// https://github.com/dankamongmen/notcurses/issues/1699
+// https://github.com/dankamongmen/notcurses/issues/1700
+
+use libnotcurses_sys::*;
+use raqote::*;
+
+const W: u32 = 16;
+const H: u32 = 8;
+
+fn main() -> NcResult<()> {
+    let nc = Notcurses::without_altscreen()?;
+
+    println!("pixel support: {:?}", nc.check_pixel_support());
+
+    // use raqote to create a purple rectangle, 16 width, 8 height
+    let mut dt = DrawTarget::new(W as i32, H as i32);
+    dt.clear(SolidSource::from_unpremultiplied_argb(255, 80, 20, 190));
+    // dt.write_png("example.png"); // to check the image is OK
+
+    let vframe1 = NcVisual::from_bgra(dt.get_data_u8(), H, W * 4, W)?;
+
+    // BUG: draws vertical stripes
+    let voptions = NcVisualOptions::without_plane(0, 0, 0, 0, H, W, NCBLIT_1x1, 0, 0);
+    // BUG: nothing gets drawn
+    // let voptions = NcVisualOptions::without_plane(0, 0, 0, 0, H, W, NCBLIT_PIXEL, 0, 0);
+
+    vframe1.render(nc, &voptions)?;
+
+    nc.render()?;
+    vframe1.destroy();
+    nc.stop()?;
+    Ok(())
+}