WIP gallery app

user-apps/gallery/Cargo.toml

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+[package]
+name = "gallery"
+version = "0.1.0"
+edition = "2024"
+
+[dependencies]
+abi = { path = "../../abi" }
+embedded-graphics = "0.8.1"
+tinybmp = "0.6.0"

user-apps/gallery/build.rs

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+//! This build script copies the `memory.x` file from the crate root into
+//! a directory where the linker can always find it at build time.
+//! For many projects this is optional, as the linker always searches the
+//! project root directory -- wherever `Cargo.toml` is. However, if you
+//! are using a workspace or have a more complicated build setup, this
+//! build script becomes required. Additionally, by requesting that
+//! Cargo re-run the build script whenever `memory.x` is changed,
+//! updating `memory.x` ensures a rebuild of the application with the
+//! new memory settings.
+
+use std::env;
+use std::fs::File;
+use std::io::Write;
+use std::path::PathBuf;
+
+fn main() {
+    // Put `memory.x` in our output directory and ensure it's
+    // on the linker search path.
+    let out = &PathBuf::from(env::var_os("OUT_DIR").unwrap());
+    File::create(out.join("memory.x"))
+        .unwrap()
+        .write_all(include_bytes!("../memory.x"))
+        .unwrap();
+    println!("cargo:rustc-link-search={}", out.display());
+
+    println!("cargo:rerun-if-changed=memory.x");
+    println!("cargo:rustc-link-arg-bins=-Tmemory.x");
+}

user-apps/gallery/src/main.rs

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+#![no_std]
+#![no_main]
+
+extern crate alloc;
+use abi::{
+    KeyCode, KeyState, Rng,
+    display::{Display, SCREEN_HEIGHT, SCREEN_WIDTH},
+    file_len, get_key, list_dir, lock_display, print, read_file, sleep,
+};
+use alloc::{format, vec::Vec};
+use core::panic::PanicInfo;
+use embedded_graphics::{Drawable, image::Image, prelude::*};
+use tinybmp::Bmp;
+
+#[panic_handler]
+fn panic(info: &PanicInfo) -> ! {
+    print(&format!(
+        "user panic: {} @ {:?}",
+        info.message(),
+        info.location(),
+    ));
+    loop {}
+}
+
+#[unsafe(no_mangle)]
+pub extern "Rust" fn _start() {
+    main()
+}
+
+pub fn main() {
+    print("Starting Gallery app");
+    let mut display = Display;
+
+    let file = "/images/ferriseyes_tiny.bmp";
+
+    let mut bmp_buf = [0_u8; 3_000];
+    let read = read_file(file, 0, &mut bmp_buf);
+    let bmp = Bmp::from_slice(&bmp_buf[..read]).unwrap();
+
+    // ensure all draws show up at once
+    lock_display(true);
+    Image::new(&bmp, Point::new(10, 20))
+        .draw(&mut display)
+        .unwrap();
+    lock_display(false);
+
+    loop {
+        let event = get_key();
+        if event.state != KeyState::Idle {
+            match event.key {
+                KeyCode::Esc => return,
+                _ => (),
+            }
+        };
+    }
+}