na-mainloop: Use new NativeWindow::lock() API

Author: MarijnS95

na-mainloop/Cargo.toml

@@ -3,16 +3,15 @@ name = "na-mainloop"
 version = "0.1.0"
 edition = "2021"
 
-# See more keys and their definitions at https://doc.rust-lang.org/cargo/reference/manifest.html
-
 [dependencies]
 log = "0.4"
 android_logger = "0.11.0"
-android-activity = { version = "0.4", features = [ "native-activity" ] }
+android-activity = { version = "0.4", features = ["native-activity"] }
+ndk = "0.7"
 
 [lib]
-#name="na_mainloop"
-crate_type=["cdylib"]
+# name = "na_mainloop"
+crate_type = ["cdylib"]
 
 
 ####################
@@ -24,7 +23,7 @@ crate_type=["cdylib"]
 package = "com.foo.bar"
 
 # Specifies the array of targets to build for.
-build_targets = [ "aarch64-linux-android" ]
+build_targets = ["aarch64-linux-android"]
 
 # Path to your application's resources folder.
 # If not specified, resources will not be included in the APK.
@@ -179,4 +178,9 @@ label = "Application Name"
 #port = "8080"
 #path = "/rust-windowing/android-ndk-rs/tree/master/cargo-apk"
 #path_prefix = "/rust-windowing/"
-#mime_type = "image/jpeg"
+#mime_type = "image/jpeg"
+
+[patch.crates-io]
+android-activity = { git = "https://github.com/MarijnS95/android-activity", rev = "d8eade5" }
+ndk = { git = "https://github.com/rust-mobile/ndk", rev = "b520751" }
+ndk-sys = { git = "https://github.com/rust-mobile/ndk", rev = "b520751" }

na-mainloop/src/lib.rs

@@ -1,5 +1,6 @@
 use android_activity::{AndroidApp, InputStatus, MainEvent, PollEvent};
 use log::info;
+use ndk::native_window::HardwareBufferFormat;
 
 #[no_mangle]
 fn android_main(app: AndroidApp) {
@@ -38,6 +39,14 @@ fn android_main(app: AndroidApp) {
                             }
                             MainEvent::InitWindow { .. } => {
                                 native_window = app.native_window();
+                                if let Some(nw) = &native_window {
+                                    nw.set_buffers_geometry(
+                                        0,
+                                        0,
+                                        Some(HardwareBufferFormat::R8G8B8A8_UNORM),
+                                    )
+                                    .unwrap()
+                                }
                                 redraw_pending = true;
                             }
                             MainEvent::TerminateWindow { .. } => {
@@ -91,12 +100,15 @@ fn android_main(app: AndroidApp) {
 /// responsive, otherwise it will stop delivering input
 /// events to us.
 fn dummy_render(native_window: &ndk::native_window::NativeWindow) {
-    unsafe {
-        let mut buf: ndk_sys::ANativeWindow_Buffer = std::mem::zeroed();
-        let mut rect: ndk_sys::ARect = std::mem::zeroed();
-        ndk_sys::ANativeWindow_lock(native_window.ptr().as_ptr() as _, &mut buf as _, &mut rect as _);
-        // Note: we don't try and touch the buffer since that
-        // also requires us to handle various buffer formats
-        ndk_sys::ANativeWindow_unlockAndPost(native_window.ptr().as_ptr() as _);
+    let mut lock = native_window.lock(None).unwrap();
+    let (w, h) = (lock.width(), lock.height());
+
+    for (y, line) in lock.lines().unwrap().enumerate() {
+        let r = y * 255 / h;
+        for (x, pixels) in line.chunks_mut(4).enumerate() {
+            let g = x * 255 / w;
+            pixels[0].write(r as u8);
+            pixels[1].write(g as u8);
+        }
     }
-}
+}