feat(graphics): implement ANativeWindow C-ABI types and pixel formats

crates/molotov-core/src/graphics/mod.rs

@@ -0,0 +1,2 @@
+// SPDX-License-Identifier: GPL-3.0-or-later
+pub mod types;

crates/molotov-core/src/graphics/types.rs

@@ -0,0 +1,50 @@
+// SPDX-License-Identifier: GPL-3.0-or-later
+use std::ffi::c_void;
+
+pub const WINDOW_FORMAT_RGBA_8888: i32 = 1;
+pub const WINDOW_FORMAT_RGBX_8888: i32 = 2;
+pub const WINDOW_FORMAT_RGB_565: i32 = 4;
+
+#[repr(i32)]
+#[derive(Debug, Clone, Copy, PartialEq, Eq)]
+pub enum WindowFormat {
+    Rgba8888 = 1,
+    Rgbx8888 = 2,
+    Rgb565 = 4,
+}
+
+impl WindowFormat {
+    pub fn from_i32(val: i32) -> Option<Self> {
+        match val {
+            1 => Some(WindowFormat::Rgba8888),
+            2 => Some(WindowFormat::Rgbx8888),
+            4 => Some(WindowFormat::Rgb565),
+            _ => None,
+        }
+    }
+
+    pub fn bytes_per_pixel(&self) -> usize {
+        match self {
+            WindowFormat::Rgba8888 | WindowFormat::Rgbx8888 => 4,
+            WindowFormat::Rgb565 => 2,
+        }
+    }
+}
+
+#[repr(C)]
+pub struct ARect {
+    pub left: i32,
+    pub top: i32,
+    pub right: i32,
+    pub bottom: i32,
+}
+
+#[repr(C)]
+pub struct ANativeWindow_Buffer {
+    pub width: i32,
+    pub height: i32,
+    pub stride: i32,
+    pub format: i32,
+    pub bits: *mut c_void,
+    pub reserved: [u32; 6],
+}

crates/molotov-core/src/lib.rs

@@ -2,6 +2,7 @@
 pub mod audio;
 pub mod dynamic;
 pub mod elf;
+pub mod graphics;
 pub mod input;
 pub mod jni;
 pub mod linker;

crates/molotov-core/tests/graphics_types_test.rs

@@ -0,0 +1,10 @@
+// SPDX-License-Identifier: GPL-3.0-or-later
+use molotov_core::graphics::types::{WindowFormat, WINDOW_FORMAT_RGBA_8888, WINDOW_FORMAT_RGBX_8888};
+
+#[test]
+fn test_window_format_constants() {
+    assert_eq!(WindowFormat::Rgba8888 as i32, WINDOW_FORMAT_RGBA_8888);
+    assert_eq!(WindowFormat::Rgbx8888 as i32, WINDOW_FORMAT_RGBX_8888);
+    assert_eq!(WindowFormat::from_i32(1), Some(WindowFormat::Rgba8888));
+    assert_eq!(WindowFormat::from_i32(999), None);
+}