feat(core/rust): loading UI2 homescreen bg from storage

[no changelog]

core/embed/rust/src/lib.rs

@@ -16,6 +16,7 @@ mod trezorhal;
 mod micropython;
 #[cfg(feature = "protobuf")]
 mod protobuf;
+mod storage;
 mod time;
 #[cfg(feature = "ui_debug")]
 mod trace;

core/embed/rust/src/storage/mod.rs

@@ -0,0 +1,55 @@
+use crate::{
+    micropython::ffi,
+    trezorhal::storage::{get, get_length},
+};
+use core::slice;
+
+const STORAGE_VERSION_01: u8 = 1;
+const STORAGE_VERSION_02: u8 = 2;
+const STORAGE_VERSION_CURRENT: u8 = STORAGE_VERSION_02;
+
+const FLAG_PUBLIC: u16 = 0x8000;
+const FLAG_WRITE: u16 = 0xC000;
+const APP_DEVICE: u16 = 0x0100;
+
+const DEVICE_ID: u16 = FLAG_PUBLIC | APP_DEVICE;
+const VERSION: u16 = APP_DEVICE | 0x0001;
+const MNEMONIC_SECRET: u16 = APP_DEVICE | 0x0002;
+// NOTE: 0x03 key was used in the past for LANGUAGE. Not used anymore.
+const LABEL: u16 = FLAG_PUBLIC | APP_DEVICE | 0x0004;
+const USE_PASSPHRASE: u16 = APP_DEVICE | 0x0005;
+const HOMESCREEN: u16 = FLAG_PUBLIC | APP_DEVICE | 0x0006;
+const NEEDS_BACKUP: u16 = APP_DEVICE | 0x0007;
+const FLAGS: u16 = APP_DEVICE | 0x0008;
+const U2F_COUNTER_PRIVATE: u16 = APP_DEVICE | 0x0009;
+const U2F_COUNTER: u16 = FLAG_PUBLIC | APP_DEVICE | 0x0009;
+const PASSPHRASE_ALWAYS_ON_DEVICE: u16 = APP_DEVICE | 0x000A;
+const UNFINISHED_BACKUP: u16 = APP_DEVICE | 0x000B;
+const AUTOLOCK_DELAY_MS: u16 = APP_DEVICE | 0x000C;
+const NO_BACKUP: u16 = APP_DEVICE | 0x000D;
+const BACKUP_TYPE: u16 = APP_DEVICE | 0x000E;
+const ROTATION: u16 = FLAG_PUBLIC | APP_DEVICE | 0x000F;
+const SLIP39_IDENTIFIER: u16 = APP_DEVICE | 0x0010;
+const SLIP39_ITERATION_EXPONENT: u16 = APP_DEVICE | 0x0011;
+const SD_SALT_AUTH_KEY: u16 = FLAG_PUBLIC | APP_DEVICE | 0x0012;
+const INITIALIZED: u16 = FLAG_PUBLIC | APP_DEVICE | 0x0013;
+const SAFETY_CHECK_LEVEL: u16 = APP_DEVICE | 0x0014;
+const EXPERIMENTAL_FEATURES: u16 = APP_DEVICE | 0x0015;
+
+pub fn get_avatar() -> Result<&'static mut [u8], ()> {
+    let avatar_len_res = get_length(HOMESCREEN);
+
+    return if let Ok(len) = avatar_len_res {
+        let data_ptr_raw = unsafe { ffi::gc_alloc(len, 0) };
+        let buffer = unsafe { slice::from_raw_parts_mut(data_ptr_raw as _, len) };
+
+        if len <= buffer.len() {
+            unwrap!(get(HOMESCREEN, buffer));
+            Ok(&mut buffer[..len])
+        } else {
+            Err(())
+        }
+    } else {
+        Err(())
+    };
+}

core/embed/rust/src/ui/model_tt/component/homescreen.rs

@@ -1,4 +1,5 @@
 use crate::{
+    storage::get_avatar,
     time::{Duration, Instant},
     trezorhal::usb::usb_configured,
     ui::{
@@ -188,7 +189,7 @@ where
             let notification = self.get_notification();
 
             homescreen(
-                IMAGE_HOMESCREEN,
+                get_image(),
                 texts,
                 notification,
                 self.paint_notification_only,
@@ -269,7 +270,15 @@ where
             None,
         ],));
 
-        homescreen(IMAGE_HOMESCREEN, texts, None, false);
+        homescreen(get_image(), texts, None, false);
+    }
+}
+
+fn get_image() -> &'static [u8] {
+    if let Ok(data) = get_avatar() {
+        data
+    } else {
+        IMAGE_HOMESCREEN
     }
 }