add use-vendored-config feature

Without that, I got the following error from cargo:
```
error: target `demo` in package `lvgl` requires the features: `alloc`
Consider enabling them by passing, e.g., `--features="alloc"`
```

Cargo.toml

@@ -1,7 +1,6 @@
 [workspace]
 members = [
     "lvgl",
-    "lvgl-sys",
     "lvgl-codegen",
-    "examples"
+    "lvgl-sys",
 ]

README.md

@@ -1,24 +1,41 @@
-<h1 align="center"> LittlevGL - Open-source Embedded GUI Library in Rust</h1>
+[![SWUbanner](https://raw.githubusercontent.com/vshymanskyy/StandWithUkraine/main/banner2-direct.svg)](https://github.com/vshymanskyy/StandWithUkraine/blob/main/docs/README.md)
 
-![Original LittlevGL demo image](lv_demo.png)
+<h1 align="center"> LVGL - Open-source Embedded GUI Library in Rust</h1>
+
+![Original LVGL demo image](lv_demo.png)
 
 <p align="center">
-LittlevGL provides everything you need to create a Graphical User Interface (GUI) on embedded systems with easy-to-use graphical elements, beautiful visual effects and low memory footprint. 
+LVGL provides everything you need to create a Graphical User Interface (GUI) on embedded systems with easy-to-use graphical elements, beautiful visual effects and low memory footprint. 
 </p>
 <p align="center">
-LittlevGL is compatible with <samp>#![no_std]</samp> environments by default.
+LVGL is compatible with <samp>#![no_std]</samp> environments by default.
 </p>
 
 <h4 align="center">
-<a href="https://lvgl.io/">Official LittlevGL Website </a> &middot; 
+<a href="https://github.com/rafaelcaricio/lvgl-rs-wasm">Rust to WASM demo</a> &middot;
+<a href="https://lvgl.io/">Official LVGL Website </a> &middot;
 <a href="https://github.com/littlevgl/lvgl">C library repository</a> &middot;
-<a href="https://lvgl.io/demos">Live demo</a>
+<a href="https://lvgl.io/demos">Official live demos</a>
 </h4>
 
 ---
 
 ![Rust bindings usage demo code.](demo.png)
 
+## System Build Dependencies
+
+In order to build the `lvgl` project you will need the following system dependencies to be installed:
+
+```
+$ sudo apt install build-essential llvm clang
+```
+
+If you want to build the examples, then you will need to install SDL2 as well.
+
+```
+$ sudo apt install libsdl2-dev
+```
+
 ## Usage
 
 Edit your `Cargo.toml` file dependencies with:
@@ -28,7 +45,7 @@ $ cargo add lvgl
 
 The build requires the environment variable bellow to be set:
 
-- `DEP_LV_CONFIG_PATH`: Path to the directory containing the `lv_conf.h` header file used for configuration of LittlevGL library.
+- `DEP_LV_CONFIG_PATH`: Path to the directory containing the `lv_conf.h` header file used for configuration of LVGL library.
 
 We recommend the `lv_conf.h` file to be in your project's root directory. If so, the command to build your project would be:
 ```shell script
@@ -44,9 +61,22 @@ for `no_std`, so we need to use a workaround to build "lvgl-rs". The mainstrem i
 ```shell
 $ DEP_LV_CONFIG_PATH=`pwd` cargo build -Zfeatures=build_dep
 ```
+### LVGL Global Allocator
+
+A [global allocator](https://doc.rust-lang.org/std/alloc/trait.GlobalAlloc.html) for Rust leveraging the
+[LVGL memory allocator](https://github.com/lvgl/lvgl/blob/master/src/misc/lv_mem.h) is provided, but not enabled 
+by default. Can be enabled by the feature `lvgl_alloc`. This will make all dynamic memory to be allocated by LVGL 
+internal memory manager.
 
 ## Running the demo
 
+**Hint for macOS users**: Before you run the demos you need to make sure you have [libsdl](https://www.libsdl.org)
+installed on your machine. To install it, use HomeBrew:
+
+```shell
+$ brew install sdl2
+```
+
 [This project contains examples that can run in a desktop simulator.](./examples)
 
 First, make sure to pull `lvgl-rs` submodules:
@@ -58,7 +88,7 @@ $ git submodule update
 Then run the `demo` example:
 
 ```shell
-$ DEP_LV_CONFIG_PATH=`pwd`/examples/include cargo run --example demo
+$ DEP_LV_CONFIG_PATH=`pwd`/examples/include cargo run --example demo --features="alloc"
 ```
 
 ## Feature Support

examples/Cargo.toml

@@ -1,34 +0,0 @@
-[package]
-name = "demo"
-version = "0.1.0"
-authors = ["Rafael Caricio <crates@caric.io>"]
-edition = "2018"
-publish = false
-
-[dev-dependencies]
-lvgl = { path = "../lvgl" }
-lvgl-sys = { path = "../lvgl-sys" }
-embedded-graphics = "0.6"
-embedded-graphics-simulator = "0.2.0"
-heapless = "0.5.5"
-cstr_core = { version = "0.2.0", features = ["alloc"] }
-
-[[example]]
-name = "demo"
-path = "demo.rs"
-
-[[example]]
-name = "bar"
-path = "bar.rs"
-
-[[example]]
-name = "button_click"
-path = "button_click.rs"
-
-[[example]]
-name = "gauge"
-path = "gauge.rs"
-
-[[example]]
-name = "arc"
-path = "arc.rs"

examples/arc.rs

@@ -11,7 +11,31 @@ use lvgl::{LvError, Widget};
 use lvgl_sys;
 use std::time::Instant;
 
+fn mem_info() -> lvgl_sys::lv_mem_monitor_t {
+    let mut info = lvgl_sys::lv_mem_monitor_t {
+        total_size: 0,
+        free_cnt: 0,
+        free_size: 0,
+        free_biggest_size: 0,
+        used_cnt: 0,
+        max_used: 0,
+        used_pct: 0,
+        frag_pct: 0,
+    };
+    unsafe {
+        lvgl_sys::lv_mem_monitor(&mut info as *mut _);
+    }
+    info
+}
+
 fn main() -> Result<(), LvError> {
+    println!("meminfo init: {:?}", mem_info());
+    run_arc_demo()?;
+    println!("meminfo end: {:?}", mem_info());
+    Ok(())
+}
+
+fn run_arc_demo() -> Result<(), LvError> {
     let display: SimulatorDisplay<Rgb565> = SimulatorDisplay::new(Size::new(
         lvgl_sys::LV_HOR_RES_MAX,
         lvgl_sys::LV_VER_RES_MAX,
@@ -58,6 +82,7 @@ fn main() -> Result<(), LvError> {
         if i > 270 {
             forward = if forward { false } else { true };
             i = 1;
+            println!("meminfo running: {:?}", mem_info());
         }
         angle = if forward { angle + 1 } else { angle - 1 };
         arc.set_end_angle(angle + 135)?;

examples/demo.rs

@@ -1,4 +1,4 @@
-use cstr_core::{CStr, CString};
+use cstr_core::CString;
 use embedded_graphics::pixelcolor::Rgb565;
 use embedded_graphics::prelude::*;
 use embedded_graphics_simulator::{
@@ -52,20 +52,6 @@ fn main() -> Result<(), LvError> {
     bt.set_label_align(LabelAlign::Left)?;
     bt.set_align(&mut screen, Align::InTopLeft, 0, 0)?;
 
-    fn set_text<S>(text: S) -> Result<(), ()>
-    where
-        S: AsRef<cstr_core::CStr>,
-    {
-        let _v: *const i8 = text.as_ref().as_ptr();
-        Ok(())
-    }
-
-    let mut t: heapless::String<heapless::consts::U8> = heapless::String::from("test");
-    t.push('\0').unwrap();
-    set_text(CStr::from_bytes_with_nul(t.as_bytes()).unwrap()).unwrap();
-    set_text(cstr_core::CStr::from_bytes_with_nul("test\0".as_bytes()).unwrap()).unwrap();
-    set_text(cstr_core::CString::new("test").unwrap().as_c_str()).unwrap();
-
     let mut power = Label::new(&mut screen)?;
     power.set_recolor(true)?;
     power.set_width(80)?;
@@ -80,8 +66,8 @@ fn main() -> Result<(), LvError> {
         if i > 59 {
             i = 0;
         }
-        let val = format!("21:{:02}", i);
-        time.set_text(CString::new(val.as_str()).unwrap().as_c_str())?;
+        let val = CString::new(format!("21:{:02}", i)).unwrap();
+        time.set_text(&val)?;
         i = 1 + i;
 
         ui.task_handler();
@@ -102,7 +88,7 @@ fn main() -> Result<(), LvError> {
     Ok(())
 }
 
-// Reference to native font for LittlevGL, defined in the file: "fonts_noto_sans_numeric_80.c"
+// Reference to native font for LVGL, defined in the file: "fonts_noto_sans_numeric_80.c"
 // TODO: Create a macro for defining a safe wrapper for fonts.
 // Maybe sometihng like:
 //

examples/include/lv_conf.h

@@ -80,7 +80,7 @@ typedef int16_t lv_coord_t;
 #define LV_MEM_CUSTOM      0
 #if LV_MEM_CUSTOM == 0
 /* Size of the memory used by `lv_mem_alloc` in bytes (>= 2kB)*/
-#  define LV_MEM_SIZE    (32U * 1024U)
+#  define LV_MEM_SIZE    (1048576U) // 1Mb
 
 /* Complier prefix for a big array declaration */
 #  define LV_MEM_ATTR

lvgl-codegen/Cargo.toml

@@ -1,6 +1,6 @@
 [package]
 name = "lvgl-codegen"
-version = "0.4.0"
+version = "0.5.2"
 description = "Code generation based on LVGL source code"
 authors = ["Rafael Caricio <crates.lvgl@caric.io>"]
 readme = "README.md"
@@ -9,10 +9,10 @@ license = "MIT"
 repository = "https://github.com/rafaelcaricio/lvgl-rs"
 
 [dependencies]
-regex = "1.3.9"
-quote = "1.0.7"
+regex = "1.4.3"
+quote = "1.0.9"
 lazy_static = "1.4.0"
-proc-macro2 = "1.0.18"
+proc-macro2 = "1.0.27"
 Inflector = "0.11.4"
-syn = { version = "1.0.31", features = ["full"]}
+syn = { version = "1.0.72", features = ["full"]}
 

lvgl-codegen/src/lib.rs

@@ -1,12 +1,11 @@
 use inflector::cases::pascalcase::to_pascal_case;
 use lazy_static::lazy_static;
 use proc_macro2::{Ident, TokenStream};
-use quote::format_ident;
 use quote::quote;
+use quote::{format_ident, ToTokens};
 use regex::Regex;
 use std::collections::HashMap;
 use std::error::Error;
-use syn::export::ToTokens;
 use syn::{FnArg, ForeignItem, ForeignItemFn, Item, ReturnType};
 
 type CGResult<T> = Result<T, Box<dyn Error>>;
@@ -304,21 +303,21 @@ impl Rusty for LvArg {
 #[derive(Clone)]
 pub struct LvType {
     literal_name: String,
-    r_type: Option<Box<syn::Type>>,
+    _r_type: Option<Box<syn::Type>>,
 }
 
 impl LvType {
     pub fn new(literal_name: String) -> Self {
         Self {
             literal_name,
-            r_type: None,
+            _r_type: None,
         }
     }
 
     pub fn from(r_type: Box<syn::Type>) -> Self {
         Self {
             literal_name: r_type.to_token_stream().to_string(),
-            r_type: Some(r_type),
+            _r_type: Some(r_type),
         }
     }
 

lvgl-sys/Cargo.toml

@@ -1,7 +1,7 @@
 [package]
 name = "lvgl-sys"
-description = "Raw bindings to the LittlevGL C library."
-version = "0.4.0"
+description = "Raw bindings to the LVGL C library."
+version = "0.5.2"
 authors = ["Rafael Caricio <crates.lvgl-sys@caric.io>"]
 edition = "2018"
 license = "MIT"
@@ -20,5 +20,8 @@ name = "lvgl_sys"
 cty = "0.2.1"
 
 [build-dependencies]
-cc = "1.0.50"
-bindgen = "0.54.0"
+cc = "1.0.68"
+bindgen = "0.59.2"
+
+[features]
+use-vendored-config = []

lvgl-sys/README.md

@@ -5,7 +5,7 @@ Rust raw bindings for LittlevGL library.
 
 Build requires environment variables to be set:
 
-- `DEP_LV_CONFIG_PATH`: Path to the directory containing the `lv_conf.h` header file used for configuration of LittlevGL library.
+- `DEP_LV_CONFIG_PATH`: Path to the directory containing the `lv_conf.h` header file used for configuration of LVGL library.
 
 We recommend the `lv_conf.h` file to be in your project's root directory. If so, the command to build your project would be:
 ```shell script

lvgl-sys/build.rs

@@ -4,36 +4,50 @@ use std::{env, path::Path, path::PathBuf};
 static CONFIG_NAME: &str = "DEP_LV_CONFIG_PATH";
 
 fn main() {
-    let project_dir = PathBuf::from(env::var("CARGO_MANIFEST_DIR").unwrap())
-        .canonicalize()
-        .unwrap();
+    let project_dir = canonicalize(PathBuf::from(env::var("CARGO_MANIFEST_DIR").unwrap()));
     let shims_dir = project_dir.join("shims");
     let vendor = project_dir.join("vendor");
     let vendor_src = vendor.join("lvgl").join("src");
 
     let lv_config_dir = {
-        let raw_path = env::var(CONFIG_NAME).unwrap_or_else(|_| {
-            panic!(
-                "The environment variable {} is required to be defined",
-                CONFIG_NAME
-            );
-        });
-        let conf_path = PathBuf::from(raw_path);
+        let conf_path = env::var(CONFIG_NAME)
+            .map(PathBuf::from)
+            .unwrap_or_else(|_| {
+                match std::env::var("DOCS_RS") {
+                    Ok(_) => {
+                        // We've detected that we are building for docs.rs
+                        // so let's use the vendored `lv_conf.h` file.
+                        vendor.join("include")
+                    }
+                    Err(_) => {
+                        #[cfg(not(feature = "use-vendored-config"))]
+                        panic!(
+                            "The environment variable {} is required to be defined",
+                            CONFIG_NAME
+                        );
+
+                        #[cfg(feature = "use-vendored-config")]
+                        vendor.join("include")
+                    }
+                }
+            });
 
         if !conf_path.exists() {
-            panic!(format!(
-                "Directory referenced by {} needs to exist",
+            panic!(
+                "Directory {} referenced by {} needs to exist",
+                conf_path.to_string_lossy(),
                 CONFIG_NAME
-            ));
+            );
         }
         if !conf_path.is_dir() {
-            panic!(format!("{} needs to be a directory", CONFIG_NAME));
+            panic!("{} needs to be a directory", CONFIG_NAME);
         }
         if !conf_path.join("lv_conf.h").exists() {
-            panic!(format!(
-                "Directory referenced by {} needs to contain a file called lv_conf.h",
+            panic!(
+                "Directory {} referenced by {} needs to contain a file called lv_conf.h",
+                conf_path.to_string_lossy(),
                 CONFIG_NAME
-            ));
+            );
         }
 
         println!(
@@ -62,24 +76,58 @@ fn main() {
         .include(&lv_config_dir)
         .compile("lvgl");
 
-    let cc_args = [
+    let mut cc_args = vec![
         "-DLV_CONF_INCLUDE_SIMPLE=1",
         "-I",
         lv_config_dir.to_str().unwrap(),
         "-I",
         vendor.to_str().unwrap(),
+        "-fvisibility=default",
     ];
 
+    // Set correct target triple for bindgen when cross-compiling
+    let target = env::var("TARGET").expect("Cargo build scripts always have TARGET");
+    let host = env::var("HOST").expect("Cargo build scripts always have HOST");
+    if target != host {
+        cc_args.push("-target");
+        cc_args.push(target.as_str());
+    }
+
+    let mut additional_args = Vec::new();
+    if target.ends_with("emscripten") {
+        if let Ok(em_path) = env::var("EMSDK") {
+            additional_args.push("-I".to_string());
+            additional_args.push(format!(
+                "{}/upstream/emscripten/system/include/libc",
+                em_path
+            ));
+            additional_args.push("-I".to_string());
+            additional_args.push(format!(
+                "{}/upstream/emscripten/system/lib/libc/musl/arch/emscripten",
+                em_path
+            ));
+            additional_args.push("-I".to_string());
+            additional_args.push(format!(
+                "{}/upstream/emscripten/system/include/SDL",
+                em_path
+            ));
+        }
+    }
+
     let out_path = PathBuf::from(env::var("OUT_DIR").unwrap());
-    bindgen::Builder::default()
+    let bindings = bindgen::Builder::default()
         .header(shims_dir.join("lvgl_sys.h").to_str().unwrap())
+        .generate_comments(false)
         .layout_tests(false)
         .use_core()
         .rustfmt_bindings(true)
         .ctypes_prefix("cty")
         .clang_args(&cc_args)
+        .clang_args(&additional_args)
         .generate()
-        .expect("Unable to generate bindings")
+        .expect("Unable to generate bindings");
+
+    bindings
         .write_to_file(out_path.join("bindings.rs"))
         .expect("Can't write bindings!");
 }
@@ -95,3 +143,10 @@ fn add_c_files(build: &mut cc::Build, path: impl AsRef<Path>) {
         }
     }
 }
+
+fn canonicalize(path: impl AsRef<Path>) -> PathBuf {
+    let canonicalized = path.as_ref().canonicalize().unwrap();
+    let canonicalized = &*canonicalized.to_string_lossy();
+
+    PathBuf::from(canonicalized.strip_prefix(r"\\?\").unwrap_or(canonicalized))
+}

lvgl-sys/src/lib.rs

@@ -23,10 +23,10 @@ mod tests {
             lv_init();
 
             let horizontal_resolution = lv_disp_get_hor_res(core::ptr::null_mut());
-            assert_eq!(horizontal_resolution, 240);
+            assert_eq!(horizontal_resolution, LV_HOR_RES_MAX as i16);
 
             let vertical_resolution = lv_disp_get_ver_res(core::ptr::null_mut());
-            assert_eq!(vertical_resolution, 240);
+            assert_eq!(vertical_resolution, LV_VER_RES_MAX as i16);
         }
     }
 }

lvgl-sys/vendor/include/lv_conf.h

@@ -0,0 +1,701 @@
+/**
+ * @file lv_conf.h
+ *
+ */
+
+/*
+ * COPY THIS FILE AS `lv_conf.h` NEXT TO the `lvgl` FOLDER
+ */
+
+#if 1 /*Set it to "1" to enable content*/
+
+#ifndef LV_CONF_H
+#define LV_CONF_H
+/* clang-format off */
+
+#include <stdint.h>
+
+/*====================
+   Graphical settings
+ *====================*/
+
+/* Maximal horizontal and vertical resolution to support by the library.*/
+#define LV_HOR_RES_MAX          (240)
+#define LV_VER_RES_MAX          (240)
+
+/* Color depth:
+ * - 1:  1 byte per pixel
+ * - 8:  RGB332
+ * - 16: RGB565
+ * - 32: ARGB8888
+ */
+#define LV_COLOR_DEPTH     16
+
+/* Swap the 2 bytes of RGB565 color.
+ * Useful if the display has a 8 bit interface (e.g. SPI)*/
+#define LV_COLOR_16_SWAP   0
+
+/* 1: Enable screen transparency.
+ * Useful for OSD or other overlapping GUIs.
+ * Requires `LV_COLOR_DEPTH = 32` colors and the screen's style should be modified: `style.body.opa = ...`*/
+#define LV_COLOR_SCREEN_TRANSP    0
+
+/*Images pixels with this color will not be drawn (with chroma keying)*/
+#define LV_COLOR_TRANSP    LV_COLOR_LIME         /*LV_COLOR_LIME: pure green*/
+
+/* Enable anti-aliasing (lines, and radiuses will be smoothed) */
+#define LV_ANTIALIAS        1
+
+/* Default display refresh period.
+ * Can be changed in the display driver (`lv_disp_drv_t`).*/
+#define LV_DISP_DEF_REFR_PERIOD      30      /*[ms]*/
+
+/* Dot Per Inch: used to initialize default sizes.
+ * E.g. a button with width = LV_DPI / 2 -> half inch wide
+ * (Not so important, you can adjust it to modify default sizes and spaces)*/
+#define LV_DPI              130     /*[px]*/
+
+/* The the real width of the display changes some default values:
+ * default object sizes, layout of examples, etc.
+ * According to the width of the display (hor. res. / dpi)
+ * the displays fall in 4 categories.
+ * The 4th is extra large which has no upper limit so not listed here
+ * The upper limit of the categories are set below in 0.1 inch unit.
+ */
+#define LV_DISP_SMALL_LIMIT  30
+#define LV_DISP_MEDIUM_LIMIT 50
+#define LV_DISP_LARGE_LIMIT  70
+
+/* Type of coordinates. Should be `int16_t` (or `int32_t` for extreme cases) */
+typedef int16_t lv_coord_t;
+
+/*=========================
+   Memory manager settings
+ *=========================*/
+
+/* LittelvGL's internal memory manager's settings.
+ * The graphical objects and other related data are stored here. */
+
+/* 1: use custom malloc/free, 0: use the built-in `lv_mem_alloc` and `lv_mem_free` */
+#define LV_MEM_CUSTOM      0
+#if LV_MEM_CUSTOM == 0
+/* Size of the memory used by `lv_mem_alloc` in bytes (>= 2kB)*/
+#  define LV_MEM_SIZE    (32U * 1024U)
+
+/* Complier prefix for a big array declaration */
+#  define LV_MEM_ATTR
+
+/* Set an address for the memory pool instead of allocating it as an array.
+ * Can be in external SRAM too. */
+#  define LV_MEM_ADR          0
+
+/* Automatically defrag. on free. Defrag. means joining the adjacent free cells. */
+#  define LV_MEM_AUTO_DEFRAG  1
+#else       /*LV_MEM_CUSTOM*/
+#  define LV_MEM_CUSTOM_INCLUDE <stdlib.h>   /*Header for the dynamic memory function*/
+#  define LV_MEM_CUSTOM_ALLOC   malloc       /*Wrapper to malloc*/
+#  define LV_MEM_CUSTOM_FREE    free         /*Wrapper to free*/
+#endif     /*LV_MEM_CUSTOM*/
+
+/* Garbage Collector settings
+ * Used if lvgl is binded to higher level language and the memory is managed by that language */
+#define LV_ENABLE_GC 0
+#if LV_ENABLE_GC != 0
+#  define LV_GC_INCLUDE "gc.h"                           /*Include Garbage Collector related things*/
+#  define LV_MEM_CUSTOM_REALLOC   your_realloc           /*Wrapper to realloc*/
+#  define LV_MEM_CUSTOM_GET_SIZE  your_mem_get_size      /*Wrapper to lv_mem_get_size*/
+#endif /* LV_ENABLE_GC */
+
+/*=======================
+   Input device settings
+ *=======================*/
+
+/* Input device default settings.
+ * Can be changed in the Input device driver (`lv_indev_drv_t`)*/
+
+/* Input device read period in milliseconds */
+#define LV_INDEV_DEF_READ_PERIOD          30
+
+/* Drag threshold in pixels */
+#define LV_INDEV_DEF_DRAG_LIMIT           10
+
+/* Drag throw slow-down in [%]. Greater value -> faster slow-down */
+#define LV_INDEV_DEF_DRAG_THROW           10
+
+/* Long press time in milliseconds.
+ * Time to send `LV_EVENT_LONG_PRESSSED`) */
+#define LV_INDEV_DEF_LONG_PRESS_TIME      400
+
+/* Repeated trigger period in long press [ms]
+ * Time between `LV_EVENT_LONG_PRESSED_REPEAT */
+#define LV_INDEV_DEF_LONG_PRESS_REP_TIME  100
+
+
+/* Gesture threshold in pixels */
+#define LV_INDEV_DEF_GESTURE_LIMIT        50
+
+/* Gesture min velocity at release before swipe (pixels)*/
+#define LV_INDEV_DEF_GESTURE_MIN_VELOCITY 3
+
+/*==================
+ * Feature usage
+ *==================*/
+
+/*1: Enable the Animations */
+#define LV_USE_ANIMATION        1
+#if LV_USE_ANIMATION
+
+/*Declare the type of the user data of animations (can be e.g. `void *`, `int`, `struct`)*/
+typedef void * lv_anim_user_data_t;
+
+#endif
+
+/* 1: Enable shadow drawing*/
+#define LV_USE_SHADOW           1
+#if LV_USE_SHADOW
+/* Allow buffering some shadow calculation
+ * LV_SHADOW_CACHE_SIZE is the max. shadow size to buffer,
+ * where shadow size is `shadow_width + radius`
+ * Caching has LV_SHADOW_CACHE_SIZE^2 RAM cost*/
+#define LV_SHADOW_CACHE_SIZE    0
+#endif
+
+/* 1: Use other blend modes than normal (`LV_BLEND_MODE_...`)*/
+#define LV_USE_BLEND_MODES      1
+
+/* 1: Use the `opa_scale` style property to set the opacity of an object and its children at once*/
+#define LV_USE_OPA_SCALE        1
+
+/* 1: Use image zoom and rotation*/
+#define LV_USE_IMG_TRANSFORM    1
+
+/* 1: Enable object groups (for keyboard/encoder navigation) */
+#define LV_USE_GROUP            1
+#if LV_USE_GROUP
+typedef void * lv_group_user_data_t;
+#endif  /*LV_USE_GROUP*/
+
+/* 1: Enable GPU interface*/
+#define LV_USE_GPU              1   /*Only enables `gpu_fill_cb` and `gpu_blend_cb` in the disp. drv- */
+#define LV_USE_GPU_STM32_DMA2D  0
+
+/* 1: Enable file system (might be required for images */
+#define LV_USE_FILESYSTEM       1
+#if LV_USE_FILESYSTEM
+/*Declare the type of the user data of file system drivers (can be e.g. `void *`, `int`, `struct`)*/
+typedef void * lv_fs_drv_user_data_t;
+#endif
+
+/*1: Add a `user_data` to drivers and objects*/
+#define LV_USE_USER_DATA        1
+
+/*1: Show CPU usage and FPS count in the right bottom corner*/
+#define LV_USE_PERF_MONITOR     0
+
+/*1: Use the functions and types from the older API if possible */
+#define LV_USE_API_EXTENSION_V6  1
+
+/*========================
+ * Image decoder and cache
+ *========================*/
+
+/* 1: Enable indexed (palette) images */
+#define LV_IMG_CF_INDEXED       1
+
+/* 1: Enable alpha indexed images */
+#define LV_IMG_CF_ALPHA         1
+
+/* Default image cache size. Image caching keeps the images opened.
+ * If only the built-in image formats are used there is no real advantage of caching.
+ * (I.e. no new image decoder is added)
+ * With complex image decoders (e.g. PNG or JPG) caching can save the continuous open/decode of images.
+ * However the opened images might consume additional RAM.
+ * LV_IMG_CACHE_DEF_SIZE must be >= 1 */
+#define LV_IMG_CACHE_DEF_SIZE       1
+
+/*Declare the type of the user data of image decoder (can be e.g. `void *`, `int`, `struct`)*/
+typedef void * lv_img_decoder_user_data_t;
+
+/*=====================
+ *  Compiler settings
+ *====================*/
+/* Define a custom attribute to `lv_tick_inc` function */
+#define LV_ATTRIBUTE_TICK_INC
+
+/* Define a custom attribute to `lv_task_handler` function */
+#define LV_ATTRIBUTE_TASK_HANDLER
+
+/* Define a custom attribute to `lv_disp_flush_ready` function */
+#define LV_ATTRIBUTE_FLUSH_READY
+
+/* With size optimization (-Os) the compiler might not align data to
+ * 4 or 8 byte boundary. This alignment will be explicitly applied where needed.
+ * E.g. __attribute__((aligned(4))) */
+#define LV_ATTRIBUTE_MEM_ALIGN
+
+/* Attribute to mark large constant arrays for example
+ * font's bitmaps */
+#define LV_ATTRIBUTE_LARGE_CONST
+
+/* Prefix performance critical functions to place them into a faster memory (e.g RAM)
+ * Uses 15-20 kB extra memory */
+#define LV_ATTRIBUTE_FAST_MEM
+
+/* Export integer constant to binding.
+ * This macro is used with constants in the form of LV_<CONST> that
+ * should also appear on lvgl binding API such as Micropython
+ *
+ * The default value just prevents a GCC warning.
+ */
+#define LV_EXPORT_CONST_INT(int_value) struct _silence_gcc_warning
+
+/*===================
+ *  HAL settings
+ *==================*/
+
+/* 1: use a custom tick source.
+ * It removes the need to manually update the tick with `lv_tick_inc`) */
+#define LV_TICK_CUSTOM     0
+#if LV_TICK_CUSTOM == 1
+#define LV_TICK_CUSTOM_INCLUDE  "something.h"       /*Header for the sys time function*/
+#define LV_TICK_CUSTOM_SYS_TIME_EXPR (millis())     /*Expression evaluating to current systime in ms*/
+#endif   /*LV_TICK_CUSTOM*/
+
+typedef void * lv_disp_drv_user_data_t;             /*Type of user data in the display driver*/
+typedef void * lv_indev_drv_user_data_t;            /*Type of user data in the input device driver*/
+
+/*================
+ * Log settings
+ *===============*/
+
+/*1: Enable the log module*/
+#define LV_USE_LOG      0
+#if LV_USE_LOG
+/* How important log should be added:
+ * LV_LOG_LEVEL_TRACE       A lot of logs to give detailed information
+ * LV_LOG_LEVEL_INFO        Log important events
+ * LV_LOG_LEVEL_WARN        Log if something unwanted happened but didn't cause a problem
+ * LV_LOG_LEVEL_ERROR       Only critical issue, when the system may fail
+ * LV_LOG_LEVEL_NONE        Do not log anything
+ */
+#  define LV_LOG_LEVEL    LV_LOG_LEVEL_WARN
+
+/* 1: Print the log with 'printf';
+ * 0: user need to register a callback with `lv_log_register_print_cb`*/
+#  define LV_LOG_PRINTF   0
+#endif  /*LV_USE_LOG*/
+
+/*=================
+ * Debug settings
+ *================*/
+
+/* If Debug is enabled LittelvGL validates the parameters of the functions.
+ * If an invalid parameter is found an error log message is printed and
+ * the MCU halts at the error. (`LV_USE_LOG` should be enabled)
+ * If you are debugging the MCU you can pause
+ * the debugger to see exactly where  the issue is.
+ *
+ * The behavior of asserts can be overwritten by redefining them here.
+ * E.g. #define LV_ASSERT_MEM(p)  <my_assert_code>
+ */
+#define LV_USE_DEBUG        1
+#if LV_USE_DEBUG
+
+/*Check if the parameter is NULL. (Quite fast) */
+#define LV_USE_ASSERT_NULL      1
+
+/*Checks is the memory is successfully allocated or no. (Quite fast)*/
+#define LV_USE_ASSERT_MEM       1
+
+/*Check the integrity of `lv_mem` after critical operations. (Slow)*/
+#define LV_USE_ASSERT_MEM_INTEGRITY       0
+
+/* Check the strings.
+ * Search for NULL, very long strings, invalid characters, and unnatural repetitions. (Slow)
+ * If disabled `LV_USE_ASSERT_NULL` will be performed instead (if it's enabled) */
+#define LV_USE_ASSERT_STR       0
+
+/* Check NULL, the object's type and existence (e.g. not deleted). (Quite slow)
+ * If disabled `LV_USE_ASSERT_NULL` will be performed instead (if it's enabled) */
+#define LV_USE_ASSERT_OBJ       0
+
+/*Check if the styles are properly initialized. (Fast)*/
+#define LV_USE_ASSERT_STYLE     0
+
+#endif /*LV_USE_DEBUG*/
+
+/*==================
+ *    FONT USAGE
+ *===================*/
+
+/* The built-in fonts contains the ASCII range and some Symbols with  4 bit-per-pixel.
+ * The symbols are available via `LV_SYMBOL_...` defines
+ * More info about fonts: https://docs.lvgl.com/#Fonts
+ * To create a new font go to: https://lvgl.com/ttf-font-to-c-array
+ */
+
+/* Montserrat fonts with bpp = 4
+ * https://fonts.google.com/specimen/Montserrat  */
+#define LV_FONT_MONTSERRAT_12    0
+#define LV_FONT_MONTSERRAT_14    0
+#define LV_FONT_MONTSERRAT_16    1
+#define LV_FONT_MONTSERRAT_18    0
+#define LV_FONT_MONTSERRAT_20    0
+#define LV_FONT_MONTSERRAT_22    0
+#define LV_FONT_MONTSERRAT_24    0
+#define LV_FONT_MONTSERRAT_26    0
+#define LV_FONT_MONTSERRAT_28    0
+#define LV_FONT_MONTSERRAT_30    0
+#define LV_FONT_MONTSERRAT_32    0
+#define LV_FONT_MONTSERRAT_34    0
+#define LV_FONT_MONTSERRAT_36    0
+#define LV_FONT_MONTSERRAT_38    0
+#define LV_FONT_MONTSERRAT_40    0
+#define LV_FONT_MONTSERRAT_42    0
+#define LV_FONT_MONTSERRAT_44    0
+#define LV_FONT_MONTSERRAT_46    0
+#define LV_FONT_MONTSERRAT_48    0
+
+/* Demonstrate special features */
+#define LV_FONT_MONTSERRAT_12_SUBPX      0
+#define LV_FONT_MONTSERRAT_28_COMPRESSED 0  /*bpp = 3*/
+#define LV_FONT_DEJAVU_16_PERSIAN_HEBREW 0  /*Hebrew, Arabic, PErisan letters and all their forms*/
+#define LV_FONT_SIMSUN_16_CJK            0  /*1000 most common CJK radicals*/
+
+/*Pixel perfect monospace font
+ * http://pelulamu.net/unscii/ */
+#define LV_FONT_UNSCII_8     0
+
+/* Optionally declare your custom fonts here.
+ * You can use these fonts as default font too
+ * and they will be available globally. E.g.
+ * #define LV_FONT_CUSTOM_DECLARE LV_FONT_DECLARE(my_font_1) \
+ *                                LV_FONT_DECLARE(my_font_2)
+ */
+#define LV_FONT_CUSTOM_DECLARE
+
+/* Enable it if you have fonts with a lot of characters.
+ * The limit depends on the font size, font face and bpp
+ * but with > 10,000 characters if you see issues probably you need to enable it.*/
+#define LV_FONT_FMT_TXT_LARGE   0
+
+/* Set the pixel order of the display.
+ * Important only if "subpx fonts" are used.
+ * With "normal" font it doesn't matter.
+ */
+#define LV_FONT_SUBPX_BGR    0
+
+/*Declare the type of the user data of fonts (can be e.g. `void *`, `int`, `struct`)*/
+typedef void * lv_font_user_data_t;
+
+/*================
+ *  THEME USAGE
+ *================*/
+
+/*Always enable at least on theme*/
+
+/* No theme, you can apply your styles as you need
+ * No flags. Set LV_THEME_DEFAULT_FLAG 0 */
+ #define LV_USE_THEME_EMPTY       1
+
+/*Simple to the create your theme based on it
+ * No flags. Set LV_THEME_DEFAULT_FLAG 0 */
+ #define LV_USE_THEME_TEMPLATE    1
+
+/* A fast and impressive theme.
+ * Flags:
+ * LV_THEME_MATERIAL_FLAG_LIGHT: light theme
+ * LV_THEME_MATERIAL_FLAG_DARK: dark theme*/
+ #define LV_USE_THEME_MATERIAL    1
+
+/* Mono-color theme for monochrome displays.
+ * If LV_THEME_DEFAULT_COLOR_PRIMARY is LV_COLOR_BLACK the
+ * texts and borders will be black and the background will be
+ * white. Else the colors are inverted.
+ * No flags. Set LV_THEME_DEFAULT_FLAG 0 */
+ #define LV_USE_THEME_MONO        1
+
+#define LV_THEME_DEFAULT_INCLUDE            <stdint.h>      /*Include a header for the init. function*/
+#define LV_THEME_DEFAULT_INIT               lv_theme_material_init
+#define LV_THEME_DEFAULT_COLOR_PRIMARY      LV_COLOR_RED
+#define LV_THEME_DEFAULT_COLOR_SECONDARY    LV_COLOR_BLUE
+#define LV_THEME_DEFAULT_FLAG               LV_THEME_MATERIAL_FLAG_LIGHT
+#define LV_THEME_DEFAULT_FONT_SMALL         &lv_font_montserrat_16
+#define LV_THEME_DEFAULT_FONT_NORMAL        &lv_font_montserrat_16
+#define LV_THEME_DEFAULT_FONT_SUBTITLE      &lv_font_montserrat_16
+#define LV_THEME_DEFAULT_FONT_TITLE         &lv_font_montserrat_16
+
+/*=================
+ *  Text settings
+ *=================*/
+
+/* Select a character encoding for strings.
+ * Your IDE or editor should have the same character encoding
+ * - LV_TXT_ENC_UTF8
+ * - LV_TXT_ENC_ASCII
+ * */
+#define LV_TXT_ENC LV_TXT_ENC_UTF8
+
+ /*Can break (wrap) texts on these chars*/
+#define LV_TXT_BREAK_CHARS                  " ,.;:-_"
+
+/* If a word is at least this long, will break wherever "prettiest"
+ * To disable, set to a value <= 0 */
+#define LV_TXT_LINE_BREAK_LONG_LEN          0
+
+/* Minimum number of characters in a long word to put on a line before a break.
+ * Depends on LV_TXT_LINE_BREAK_LONG_LEN. */
+#define LV_TXT_LINE_BREAK_LONG_PRE_MIN_LEN  3
+
+/* Minimum number of characters in a long word to put on a line after a break.
+ * Depends on LV_TXT_LINE_BREAK_LONG_LEN. */
+#define LV_TXT_LINE_BREAK_LONG_POST_MIN_LEN 3
+
+/* The control character to use for signalling text recoloring. */
+#define LV_TXT_COLOR_CMD "#"
+
+/* Support bidirectional texts.
+ * Allows mixing Left-to-Right and Right-to-Left texts.
+ * The direction will be processed according to the Unicode Bidirectioanl Algorithm:
+ * https://www.w3.org/International/articles/inline-bidi-markup/uba-basics*/
+#define LV_USE_BIDI     0
+#if LV_USE_BIDI
+/* Set the default direction. Supported values:
+ * `LV_BIDI_DIR_LTR` Left-to-Right
+ * `LV_BIDI_DIR_RTL` Right-to-Left
+ * `LV_BIDI_DIR_AUTO` detect texts base direction */
+#define LV_BIDI_BASE_DIR_DEF  LV_BIDI_DIR_AUTO
+#endif
+
+/* Enable Arabic/Persian processing
+ * In these languages characters should be replaced with
+ * an other form based on their position in the text */
+#define LV_USE_ARABIC_PERSIAN_CHARS 0
+
+/*Change the built in (v)snprintf functions*/
+#define LV_SPRINTF_CUSTOM   0
+#if LV_SPRINTF_CUSTOM
+#  define LV_SPRINTF_INCLUDE <stdio.h>
+#  define lv_snprintf     snprintf
+#  define lv_vsnprintf    vsnprintf
+#else   /*!LV_SPRINTF_CUSTOM*/
+#  define LV_SPRINTF_DISABLE_FLOAT 1
+#endif  /*LV_SPRINTF_CUSTOM*/
+
+/*===================
+ *  LV_OBJ SETTINGS
+ *==================*/
+
+#if LV_USE_USER_DATA
+/*Declare the type of the user data of object (can be e.g. `void *`, `int`, `struct`)*/
+typedef void * lv_obj_user_data_t;
+/*Provide a function to free user data*/
+#define LV_USE_USER_DATA_FREE 0
+#if LV_USE_USER_DATA_FREE
+#  define LV_USER_DATA_FREE_INCLUDE  "something.h"  /*Header for user data free function*/
+/* Function prototype : void user_data_free(lv_obj_t * obj); */
+#  define LV_USER_DATA_FREE  (user_data_free)       /*Invoking for user data free function*/
+#endif
+#endif
+
+/*1: enable `lv_obj_realaign()` based on `lv_obj_align()` parameters*/
+#define LV_USE_OBJ_REALIGN          1
+
+/* Enable to make the object clickable on a larger area.
+ * LV_EXT_CLICK_AREA_OFF or 0: Disable this feature
+ * LV_EXT_CLICK_AREA_TINY: The extra area can be adjusted horizontally and vertically (0..255 px)
+ * LV_EXT_CLICK_AREA_FULL: The extra area can be adjusted in all 4 directions (-32k..+32k px)
+ */
+#define LV_USE_EXT_CLICK_AREA  LV_EXT_CLICK_AREA_TINY
+
+/*==================
+ *  LV OBJ X USAGE
+ *================*/
+/*
+ * Documentation of the object types: https://docs.lvgl.com/#Object-types
+ */
+
+/*Arc (dependencies: -)*/
+#define LV_USE_ARC      1
+
+/*Bar (dependencies: -)*/
+#define LV_USE_BAR      1
+
+/*Button (dependencies: lv_cont*/
+#define LV_USE_BTN      1
+
+/*Button matrix (dependencies: -)*/
+#define LV_USE_BTNMATRIX     1
+
+/*Calendar (dependencies: -)*/
+#define LV_USE_CALENDAR 1
+
+/*Canvas (dependencies: lv_img)*/
+#define LV_USE_CANVAS   1
+
+/*Check box (dependencies: lv_btn, lv_label)*/
+#define LV_USE_CHECKBOX       1
+
+/*Chart (dependencies: -)*/
+#define LV_USE_CHART    1
+#if LV_USE_CHART
+#  define LV_CHART_AXIS_TICK_LABEL_MAX_LEN    256
+#endif
+
+/*Container (dependencies: -*/
+#define LV_USE_CONT     1
+
+/*Color picker (dependencies: -*/
+#define LV_USE_CPICKER   1
+
+/*Drop down list (dependencies: lv_page, lv_label, lv_symbol_def.h)*/
+#define LV_USE_DROPDOWN    1
+#if LV_USE_DROPDOWN != 0
+/*Open and close default animation time [ms] (0: no animation)*/
+#  define LV_DROPDOWN_DEF_ANIM_TIME     200
+#endif
+
+/*Gauge (dependencies:lv_bar, lv_linemeter)*/
+#define LV_USE_GAUGE    1
+
+/*Image (dependencies: lv_label*/
+#define LV_USE_IMG      1
+
+/*Image Button (dependencies: lv_btn*/
+#define LV_USE_IMGBTN   1
+#if LV_USE_IMGBTN
+/*1: The imgbtn requires left, mid and right parts and the width can be set freely*/
+#  define LV_IMGBTN_TILED 0
+#endif
+
+/*Keyboard (dependencies: lv_btnm)*/
+#define LV_USE_KEYBOARD       1
+
+/*Label (dependencies: -*/
+#define LV_USE_LABEL    1
+#if LV_USE_LABEL != 0
+/*Hor, or ver. scroll speed [px/sec] in 'LV_LABEL_LONG_ROLL/ROLL_CIRC' mode*/
+#  define LV_LABEL_DEF_SCROLL_SPEED       25
+
+/* Waiting period at beginning/end of animation cycle */
+#  define LV_LABEL_WAIT_CHAR_COUNT        3
+
+/*Enable selecting text of the label */
+#  define LV_LABEL_TEXT_SEL               0
+
+/*Store extra some info in labels (12 bytes) to speed up drawing of very long texts*/
+#  define LV_LABEL_LONG_TXT_HINT          0
+#endif
+
+/*LED (dependencies: -)*/
+#define LV_USE_LED      1
+#if LV_USE_LED
+#  define LV_LED_BRIGHT_MIN  120      /*Minimal brightness*/
+#  define LV_LED_BRIGHT_MAX  255     /*Maximal brightness*/
+#endif
+
+/*Line (dependencies: -*/
+#define LV_USE_LINE     1
+
+/*List (dependencies: lv_page, lv_btn, lv_label, (lv_img optionally for icons ))*/
+#define LV_USE_LIST     1
+#if LV_USE_LIST != 0
+/*Default animation time of focusing to a list element [ms] (0: no animation)  */
+#  define LV_LIST_DEF_ANIM_TIME  100
+#endif
+
+/*Line meter (dependencies: *;)*/
+#define LV_USE_LINEMETER   1
+#if LV_USE_LINEMETER
+/* Draw line more precisely at cost of performance.
+ * Useful if there are lot of lines any minor are visible
+ * 0: No extra precision
+ * 1: Some extra precision
+ * 2: Best precision
+ */
+#  define LV_LINEMETER_PRECISE    0
+#endif
+
+/*Mask (dependencies: -)*/
+#define LV_USE_OBJMASK  1
+
+/*Message box (dependencies: lv_rect, lv_btnm, lv_label)*/
+#define LV_USE_MSGBOX     1
+
+/*Page (dependencies: lv_cont)*/
+#define LV_USE_PAGE     1
+#if LV_USE_PAGE != 0
+/*Focus default animation time [ms] (0: no animation)*/
+#  define LV_PAGE_DEF_ANIM_TIME     400
+#endif
+
+/*Preload (dependencies: lv_arc, lv_anim)*/
+#define LV_USE_SPINNER      1
+#if LV_USE_SPINNER != 0
+#  define LV_SPINNER_DEF_ARC_LENGTH   60      /*[deg]*/
+#  define LV_SPINNER_DEF_SPIN_TIME    1000    /*[ms]*/
+#  define LV_SPINNER_DEF_ANIM         LV_SPINNER_TYPE_SPINNING_ARC
+#endif
+
+/*Roller (dependencies: lv_ddlist)*/
+#define LV_USE_ROLLER    1
+#if LV_USE_ROLLER != 0
+/*Focus animation time [ms] (0: no animation)*/
+#  define LV_ROLLER_DEF_ANIM_TIME     200
+
+/*Number of extra "pages" when the roller is infinite*/
+#  define LV_ROLLER_INF_PAGES         7
+#endif
+
+/*Slider (dependencies: lv_bar)*/
+#define LV_USE_SLIDER    1
+
+/*Spinbox (dependencies: lv_ta)*/
+#define LV_USE_SPINBOX       1
+
+/*Switch (dependencies: lv_slider)*/
+#define LV_USE_SWITCH       1
+
+/*Text area (dependencies: lv_label, lv_page)*/
+#define LV_USE_TEXTAREA       1
+#if LV_USE_TEXTAREA != 0
+#  define LV_TEXTAREA_DEF_CURSOR_BLINK_TIME 400     /*ms*/
+#  define LV_TEXTAREA_DEF_PWD_SHOW_TIME     1500    /*ms*/
+#endif
+
+/*Table (dependencies: lv_label)*/
+#define LV_USE_TABLE    1
+#if LV_USE_TABLE
+#  define LV_TABLE_COL_MAX    12
+#endif
+
+/*Tab (dependencies: lv_page, lv_btnm)*/
+#define LV_USE_TABVIEW      1
+#  if LV_USE_TABVIEW != 0
+/*Time of slide animation [ms] (0: no animation)*/
+#  define LV_TABVIEW_DEF_ANIM_TIME    300
+#endif
+
+/*Tileview (dependencies: lv_page) */
+#define LV_USE_TILEVIEW     1
+#if LV_USE_TILEVIEW
+/*Time of slide animation [ms] (0: no animation)*/
+#  define LV_TILEVIEW_DEF_ANIM_TIME   300
+#endif
+
+/*Window (dependencies: lv_cont, lv_btn, lv_label, lv_img, lv_page)*/
+#define LV_USE_WIN      1
+
+/*==================
+ * Non-user section
+ *==================*/
+
+#if defined(_MSC_VER) && !defined(_CRT_SECURE_NO_WARNINGS)    /* Disable warnings for Visual Studio*/
+#  define _CRT_SECURE_NO_WARNINGS
+#endif
+
+/*--END OF LV_CONF_H--*/
+
+#endif /*LV_CONF_H*/
+
+#endif /*End of "Content enable"*/

lvgl-sys/vendor/lvgl

@@ -1 +1 @@
-Subproject commit 1ca1934dbe8e826ef1ed1690005fb678fea3a1f3
+Subproject commit 524709472757405ac0eef8d6d002632526430df3

lvgl/Cargo.toml

@@ -1,7 +1,7 @@
 [package]
 name = "lvgl"
-description = "LittlevGL bindings for Rust. A powerful and easy-to-use embedded GUI with many widgets, advanced visual effects (opacity, antialiasing, animations) and low memory requirements (16K RAM, 64K Flash)."
-version = "0.4.0"
+description = "LVGL bindings for Rust. A powerful and easy-to-use embedded GUI with many widgets, advanced visual effects (opacity, antialiasing, animations) and low memory requirements (16K RAM, 64K Flash)."
+version = "0.5.2"
 authors = ["Rafael Caricio <crates.lvgl@caric.io>"]
 edition = "2018"
 repository = "https://github.com/rafaelcaricio/lvgl-rs"
@@ -12,15 +12,47 @@ keywords = ["littlevgl", "lvgl", "graphical_interfaces"]
 build = "build.rs"
 
 [dependencies]
-lvgl-sys = { version = "0.4.0", path = "../lvgl-sys" }
+lvgl-sys = { version = "0.5.2", path = "../lvgl-sys" }
 cty = "0.2.1"
-embedded-graphics = "0.6.2"
-cstr_core = { version = "0.2.0" }
+embedded-graphics = "0.7.1"
+cstr_core = "0.2.3"
 bitflags = "1.2.1"
 
-[build-dependencies]
-quote = "1.0.7"
-proc-macro2 = "1.0.18"
-lvgl-codegen = { version = "0.4.0", path = "../lvgl-codegen" }
-lvgl-sys = { version = "0.4.0", path = "../lvgl-sys" }
+[features]
+alloc = ["cstr_core/alloc"]
+lvgl_alloc = ["alloc"]
+use-vendored-config = ["lvgl-sys/use-vendored-config"]
 
+[build-dependencies]
+quote = "1.0.9"
+proc-macro2 = "1.0.24"
+lvgl-codegen = { version = "0.5.2", path = "../lvgl-codegen" }
+lvgl-sys = { version = "0.5.2", path = "../lvgl-sys" }
+
+[dev-dependencies]
+embedded-graphics-simulator = "0.3.0"
+heapless = "0.7.13"
+
+[[example]]
+name = "demo"
+path = "../examples/demo.rs"
+required-features = ["alloc"]
+
+[[example]]
+name = "bar"
+path = "../examples/bar.rs"
+required-features = ["alloc"]
+
+[[example]]
+name = "button_click"
+path = "../examples/button_click.rs"
+required-features = ["alloc"]
+
+[[example]]
+name = "gauge"
+path = "../examples/gauge.rs"
+
+[[example]]
+name = "arc"
+path = "../examples/arc.rs"
+required-features = ["lvgl_alloc"]

lvgl/src/allocator.rs

@@ -0,0 +1,20 @@
+use core::alloc::{GlobalAlloc, Layout};
+
+// Register the global allocator
+#[global_allocator]
+static ALLOCATOR: LvglAlloc = LvglAlloc;
+
+pub struct LvglAlloc;
+
+unsafe impl GlobalAlloc for LvglAlloc {
+    unsafe fn alloc(&self, layout: Layout) -> *mut u8 {
+        // Make sure LVGL is initialized!
+        crate::lvgl_init();
+        lvgl_sys::lv_mem_alloc(layout.size() as lvgl_sys::size_t) as *mut u8
+    }
+
+    unsafe fn dealloc(&self, ptr: *mut u8, _layout: Layout) {
+        crate::lvgl_init();
+        lvgl_sys::lv_mem_free(ptr as *const cty::c_void)
+    }
+}

lvgl/src/lib.rs

@@ -1,15 +1,68 @@
+//! [![github]](https://github.com/rafaelcaricio/lvgl-rs) [![crates-io]](https://crates.io/crates/lvgl) [![docs-rs]](crate)
+//!
+//! [github]: https://img.shields.io/badge/github-8da0cb?style=for-the-badge&labelColor=555555&logo=github
+//! [crates-io]: https://img.shields.io/badge/crates.io-fc8d62?style=for-the-badge&labelColor=555555&logo=rust
+//! [docs-rs]: https://img.shields.io/badge/docs.rs-66c2a5?style=for-the-badge&labelColor=555555&logoColor=white&logo=data:image/svg+xml;base64,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
+//!
+//! <br>
+//!
+//! [LVGL][1] bindings for Rust. A powerful and easy-to-use embedded GUI with many widgets, advanced visual effects, and
+//! low memory footprint. This crate is compatible with `#![no_std]` environments by default.
+//!
+//! [1]: https://docs.lvgl.io/v7/en/html/get-started/quick-overview.html
+//!
+
 #![cfg_attr(not(test), no_std)]
 
 #[macro_use]
 extern crate bitflags;
 
-pub(crate) mod mem;
+#[cfg(feature = "lvgl_alloc")]
+extern crate alloc;
+
+// We can ONLY use `alloc::boxed::Box` if `lvgl_alloc` is enabled.
+// That is because we use `Box` to send memory references to LVGL. Since the global allocator, when
+// `lvgl_alloc` feature is enabled, is the LVGL memory manager then everything is in LVGL
+// managed memory anyways. In that case we can use the Rust's provided Box definition.
+//
+#[cfg(feature = "lvgl_alloc")]
+use ::alloc::boxed::Box;
+
+#[cfg(feature = "lvgl_alloc")]
+mod allocator;
+
 mod support;
 mod ui;
 #[macro_use]
 mod lv_core;
 pub mod widgets;
 
+#[cfg(not(feature = "lvgl_alloc"))]
+pub(crate) mod mem;
+
+// When LVGL allocator is not used on the Rust code, we need a way to add objects to the LVGL
+// managed memory. We implement a very simple `Box` that has the minimal features to copy memory
+// safely to the LVGL managed memory.
+//
+#[cfg(not(feature = "lvgl_alloc"))]
+use crate::mem::Box;
+
 pub use lv_core::*;
 pub use support::*;
 pub use ui::*;
+
+use core::sync::atomic::{AtomicBool, Ordering};
+
+// Initialize LVGL only once.
+static LVGL_INITIALIZED: AtomicBool = AtomicBool::new(false);
+
+pub(crate) fn lvgl_init() {
+    if LVGL_INITIALIZED
+        .compare_exchange(false, true, Ordering::Relaxed, Ordering::Relaxed)
+        .is_ok()
+    {
+        unsafe {
+            lvgl_sys::lv_init();
+        }
+    }
+}

lvgl/src/lv_core/obj.rs

@@ -1,9 +1,9 @@
 use crate::lv_core::style::Style;
-use crate::mem::Box;
+use crate::Box;
 use crate::{Align, LvError, LvResult};
 use core::ptr;
 
-/// Represents a native LittlevGL object
+/// Represents a native LVGL object
 pub trait NativeObject {
     /// Provide common way to access to the underlying native object pointer.
     fn raw(&self) -> LvResult<ptr::NonNull<lvgl_sys::lv_obj_t>>;
@@ -28,7 +28,7 @@ impl NativeObject for Obj {
     }
 }
 
-/// A wrapper for all LittlevGL common operations on generic objects.
+/// A wrapper for all LVGL common operations on generic objects.
 pub trait Widget: NativeObject {
     type SpecialEvent;
     type Part: Into<u8>;
@@ -146,8 +146,8 @@ macro_rules! define_object {
                 unsafe {
                     let mut raw = self.raw()?;
                     let obj = raw.as_mut();
-                    let user_closure = $crate::mem::Box::new(f)?;
-                    obj.user_data = $crate::mem::Box::into_raw(user_closure) as *mut cty::c_void;
+                    let user_closure = $crate::Box::new(f);
+                    obj.user_data = $crate::Box::into_raw(user_closure) as *mut cty::c_void;
                     lvgl_sys::lv_obj_set_event_cb(
                         obj,
                         lvgl_sys::lv_event_cb_t::Some($crate::support::event_callback::<Self, F>),
@@ -179,19 +179,19 @@ macro_rules! define_object {
 bitflags! {
     pub struct State: u32 {
         /// Normal, released
-        const DEFAULT  = lvgl_sys::LV_STATE_DEFAULT;
+        const DEFAULT  = lvgl_sys::LV_STATE_DEFAULT as u32;
         /// Toggled or checked
-        const CHECKED  = lvgl_sys::LV_STATE_CHECKED;
+        const CHECKED  = lvgl_sys::LV_STATE_CHECKED as u32;
         /// Focused via keypad or encoder or clicked via touchpad/mouse
-        const FOCUSED  = lvgl_sys::LV_STATE_FOCUSED;
+        const FOCUSED  = lvgl_sys::LV_STATE_FOCUSED as u32;
         /// Edit by an encoder
-        const EDITED   = lvgl_sys::LV_STATE_EDITED;
+        const EDITED   = lvgl_sys::LV_STATE_EDITED as u32;
         /// Hovered by mouse (not supported now)
-        const HOVERED  = lvgl_sys::LV_STATE_HOVERED;
+        const HOVERED  = lvgl_sys::LV_STATE_HOVERED as u32;
         /// Pressed
-        const PRESSED  = lvgl_sys::LV_STATE_PRESSED;
+        const PRESSED  = lvgl_sys::LV_STATE_PRESSED as u32;
         /// Disabled or inactive
-        const DISABLED = lvgl_sys::LV_STATE_DISABLED;
+        const DISABLED = lvgl_sys::LV_STATE_DISABLED as u32;
     }
 }
 
@@ -206,9 +206,9 @@ pub enum Part {
     All,
 }
 
-impl Into<u8> for Part {
-    fn into(self) -> u8 {
-        match self {
+impl From<Part> for u8 {
+    fn from(self_: Part) -> u8 {
+        match self_ {
             Part::Main => lvgl_sys::LV_OBJ_PART_MAIN as u8,
             Part::All => lvgl_sys::LV_OBJ_PART_ALL as u8,
         }

lvgl/src/lv_core/style.rs

@@ -1,4 +1,4 @@
-use crate::mem::Box;
+use crate::Box;
 use crate::{Color, LvResult, State};
 use core::mem;
 use cstr_core::CStr;
@@ -7,6 +7,7 @@ pub enum Themes {
     Pretty,
 }
 
+#[derive(Clone)]
 pub struct Style {
     pub(crate) raw: Box<lvgl_sys::lv_style_t>,
 }
@@ -17,7 +18,7 @@ impl Style {
         unsafe {
             lvgl_sys::_lv_style_set_ptr(
                 self.raw.as_mut(),
-                (lvgl_sys::LV_STYLE_VALUE_STR
+                (lvgl_sys::LV_STYLE_VALUE_STR as u32
                     | (native_state << lvgl_sys::LV_STYLE_STATE_POS as u32)) as u16,
                 value.as_ptr() as *mut cty::c_void,
             );
@@ -31,7 +32,7 @@ impl Default for Style {
         let raw = unsafe {
             let mut style = mem::MaybeUninit::<lvgl_sys::lv_style_t>::uninit();
             lvgl_sys::lv_style_init(style.as_mut_ptr());
-            Box::new(style.assume_init()).unwrap()
+            Box::new(style.assume_init())
         };
         Self { raw }
     }
@@ -39,122 +40,122 @@ impl Default for Style {
 
 bitflags! {
     pub struct Opacity: u32 {
-        const OPA_TRANSP = lvgl_sys::LV_OPA_TRANSP;
-        const OPA_0 = lvgl_sys::LV_OPA_0;
-        const OPA_10 = lvgl_sys::LV_OPA_10;
-        const OPA_20 = lvgl_sys::LV_OPA_20;
-        const OPA_30 = lvgl_sys::LV_OPA_30;
-        const OPA_40 = lvgl_sys::LV_OPA_40;
-        const OPA_50 = lvgl_sys::LV_OPA_50;
-        const OPA_60 = lvgl_sys::LV_OPA_60;
-        const OPA_70 = lvgl_sys::LV_OPA_70;
-        const OPA_80 = lvgl_sys::LV_OPA_80;
-        const OPA_90 = lvgl_sys::LV_OPA_90;
-        const OPA_100 = lvgl_sys::LV_OPA_100;
-        const OPA_COVER = lvgl_sys::LV_OPA_COVER;
+        const OPA_TRANSP = lvgl_sys::LV_OPA_TRANSP as u32;
+        const OPA_0 = lvgl_sys::LV_OPA_0 as u32;
+        const OPA_10 = lvgl_sys::LV_OPA_10 as u32;
+        const OPA_20 = lvgl_sys::LV_OPA_20 as u32;
+        const OPA_30 = lvgl_sys::LV_OPA_30 as u32;
+        const OPA_40 = lvgl_sys::LV_OPA_40 as u32;
+        const OPA_50 = lvgl_sys::LV_OPA_50 as u32;
+        const OPA_60 = lvgl_sys::LV_OPA_60 as u32;
+        const OPA_70 = lvgl_sys::LV_OPA_70 as u32;
+        const OPA_80 = lvgl_sys::LV_OPA_80 as u32;
+        const OPA_90 = lvgl_sys::LV_OPA_90 as u32;
+        const OPA_100 = lvgl_sys::LV_OPA_100 as u32;
+        const OPA_COVER = lvgl_sys::LV_OPA_COVER as u32;
     }
 }
 
-impl Into<u8> for Opacity {
-    fn into(self) -> u8 {
-        self.bits as u8
+impl From<Opacity> for u8 {
+    fn from(self_: Opacity) -> u8 {
+        self_.bits as u8
     }
 }
 
 bitflags! {
     pub struct StyleProp: u32 {
-        const RADIUS = lvgl_sys::LV_STYLE_RADIUS;
-        const CLIP_CORNER = lvgl_sys::LV_STYLE_CLIP_CORNER;
-        const SIZE = lvgl_sys::LV_STYLE_SIZE;
-        const TRANSFORM_WIDTH = lvgl_sys::LV_STYLE_TRANSFORM_WIDTH;
-        const TRANSFORM_HEIGHT = lvgl_sys::LV_STYLE_TRANSFORM_HEIGHT;
-        const TRANSFORM_ANGLE = lvgl_sys::LV_STYLE_TRANSFORM_ANGLE;
-        const TRANSFORM_ZOOM = lvgl_sys::LV_STYLE_TRANSFORM_ZOOM;
-        const OPA_SCALE = lvgl_sys::LV_STYLE_OPA_SCALE;
-        const PAD_TOP = lvgl_sys::LV_STYLE_PAD_TOP;
-        const PAD_BOTTOM = lvgl_sys::LV_STYLE_PAD_BOTTOM;
-        const PAD_LEFT = lvgl_sys::LV_STYLE_PAD_LEFT;
-        const PAD_RIGHT = lvgl_sys::LV_STYLE_PAD_RIGHT;
-        const PAD_INNER = lvgl_sys::LV_STYLE_PAD_INNER;
-        const MARGIN_TOP = lvgl_sys::LV_STYLE_MARGIN_TOP;
-        const MARGIN_BOTTOM = lvgl_sys::LV_STYLE_MARGIN_BOTTOM;
-        const MARGIN_LEFT = lvgl_sys::LV_STYLE_MARGIN_LEFT;
-        const MARGIN_RIGHT = lvgl_sys::LV_STYLE_MARGIN_RIGHT;
-        const BG_BLEND_MODE = lvgl_sys::LV_STYLE_BG_BLEND_MODE;
-        const BG_MAIN_STOP = lvgl_sys::LV_STYLE_BG_MAIN_STOP;
-        const BG_GRAD_STOP = lvgl_sys::LV_STYLE_BG_GRAD_STOP;
-        const BG_GRAD_DIR = lvgl_sys::LV_STYLE_BG_GRAD_DIR;
-        const BG_COLOR = lvgl_sys::LV_STYLE_BG_COLOR;
-        const BG_GRAD_COLOR = lvgl_sys::LV_STYLE_BG_GRAD_COLOR;
-        const BG_OPA = lvgl_sys::LV_STYLE_BG_OPA;
-        const BORDER_WIDTH = lvgl_sys::LV_STYLE_BORDER_WIDTH;
-        const BORDER_SIDE = lvgl_sys::LV_STYLE_BORDER_SIDE;
-        const BORDER_BLEND_MODE = lvgl_sys::LV_STYLE_BORDER_BLEND_MODE;
-        const BORDER_POST = lvgl_sys::LV_STYLE_BORDER_POST;
-        const BORDER_COLOR = lvgl_sys::LV_STYLE_BORDER_COLOR;
-        const BORDER_OPA = lvgl_sys::LV_STYLE_BORDER_OPA;
-        const OUTLINE_WIDTH = lvgl_sys::LV_STYLE_OUTLINE_WIDTH;
-        const OUTLINE_PAD = lvgl_sys::LV_STYLE_OUTLINE_PAD;
-        const OUTLINE_BLEND_MODE = lvgl_sys::LV_STYLE_OUTLINE_BLEND_MODE;
-        const OUTLINE_COLOR = lvgl_sys::LV_STYLE_OUTLINE_COLOR;
-        const OUTLINE_OPA = lvgl_sys::LV_STYLE_OUTLINE_OPA;
-        const SHADOW_WIDTH = lvgl_sys::LV_STYLE_SHADOW_WIDTH;
-        const SHADOW_OFS_X = lvgl_sys::LV_STYLE_SHADOW_OFS_X;
-        const SHADOW_OFS_Y = lvgl_sys::LV_STYLE_SHADOW_OFS_Y;
-        const SHADOW_SPREAD = lvgl_sys::LV_STYLE_SHADOW_SPREAD;
-        const SHADOW_BLEND_MODE = lvgl_sys::LV_STYLE_SHADOW_BLEND_MODE;
-        const SHADOW_COLOR = lvgl_sys::LV_STYLE_SHADOW_COLOR;
-        const SHADOW_OPA = lvgl_sys::LV_STYLE_SHADOW_OPA;
-        const PATTERN_BLEND_MODE = lvgl_sys::LV_STYLE_PATTERN_BLEND_MODE;
-        const PATTERN_REPEAT = lvgl_sys::LV_STYLE_PATTERN_REPEAT;
-        const PATTERN_RECOLOR = lvgl_sys::LV_STYLE_PATTERN_RECOLOR;
-        const PATTERN_OPA = lvgl_sys::LV_STYLE_PATTERN_OPA;
-        const PATTERN_RECOLOR_OPA = lvgl_sys::LV_STYLE_PATTERN_RECOLOR_OPA;
-        const PATTERN_IMAGE = lvgl_sys::LV_STYLE_PATTERN_IMAGE;
-        const VALUE_LETTER_SPACE = lvgl_sys::LV_STYLE_VALUE_LETTER_SPACE;
-        const VALUE_LINE_SPACE = lvgl_sys::LV_STYLE_VALUE_LINE_SPACE;
-        const VALUE_BLEND_MODE = lvgl_sys::LV_STYLE_VALUE_BLEND_MODE;
-        const VALUE_OFS_X = lvgl_sys::LV_STYLE_VALUE_OFS_X;
-        const VALUE_OFS_Y = lvgl_sys::LV_STYLE_VALUE_OFS_Y;
-        const VALUE_ALIGN = lvgl_sys::LV_STYLE_VALUE_ALIGN;
-        const VALUE_COLOR = lvgl_sys::LV_STYLE_VALUE_COLOR;
-        const VALUE_OPA = lvgl_sys::LV_STYLE_VALUE_OPA;
-        const VALUE_FONT = lvgl_sys::LV_STYLE_VALUE_FONT;
-        const VALUE_STR = lvgl_sys::LV_STYLE_VALUE_STR;
-        const TEXT_LETTER_SPACE = lvgl_sys::LV_STYLE_TEXT_LETTER_SPACE;
-        const TEXT_LINE_SPACE = lvgl_sys::LV_STYLE_TEXT_LINE_SPACE;
-        const TEXT_DECOR = lvgl_sys::LV_STYLE_TEXT_DECOR;
-        const TEXT_BLEND_MODE = lvgl_sys::LV_STYLE_TEXT_BLEND_MODE;
-        const TEXT_COLOR = lvgl_sys::LV_STYLE_TEXT_COLOR;
-        const TEXT_SEL_COLOR = lvgl_sys::LV_STYLE_TEXT_SEL_COLOR;
-        const TEXT_OPA = lvgl_sys::LV_STYLE_TEXT_OPA;
-        const TEXT_FONT = lvgl_sys::LV_STYLE_TEXT_FONT;
-        const LINE_WIDTH = lvgl_sys::LV_STYLE_LINE_WIDTH;
-        const LINE_BLEND_MODE = lvgl_sys::LV_STYLE_LINE_BLEND_MODE;
-        const LINE_DASH_WIDTH = lvgl_sys::LV_STYLE_LINE_DASH_WIDTH;
-        const LINE_DASH_GAP = lvgl_sys::LV_STYLE_LINE_DASH_GAP;
-        const LINE_ROUNDED = lvgl_sys::LV_STYLE_LINE_ROUNDED;
-        const LINE_COLOR = lvgl_sys::LV_STYLE_LINE_COLOR;
-        const LINE_OPA = lvgl_sys::LV_STYLE_LINE_OPA;
-        const IMAGE_BLEND_MODE = lvgl_sys::LV_STYLE_IMAGE_BLEND_MODE;
-        const IMAGE_RECOLOR = lvgl_sys::LV_STYLE_IMAGE_RECOLOR;
-        const IMAGE_OPA = lvgl_sys::LV_STYLE_IMAGE_OPA;
-        const IMAGE_RECOLOR_OPA = lvgl_sys::LV_STYLE_IMAGE_RECOLOR_OPA;
-        const TRANSITION_TIME = lvgl_sys::LV_STYLE_TRANSITION_TIME;
-        const TRANSITION_DELAY = lvgl_sys::LV_STYLE_TRANSITION_DELAY;
-        const TRANSITION_PROP_1 = lvgl_sys::LV_STYLE_TRANSITION_PROP_1;
-        const TRANSITION_PROP_2 = lvgl_sys::LV_STYLE_TRANSITION_PROP_2;
-        const TRANSITION_PROP_3 = lvgl_sys::LV_STYLE_TRANSITION_PROP_3;
-        const TRANSITION_PROP_4 = lvgl_sys::LV_STYLE_TRANSITION_PROP_4;
-        const TRANSITION_PROP_5 = lvgl_sys::LV_STYLE_TRANSITION_PROP_5;
-        const TRANSITION_PROP_6 = lvgl_sys::LV_STYLE_TRANSITION_PROP_6;
-        const TRANSITION_PATH = lvgl_sys::LV_STYLE_TRANSITION_PATH;
-        const SCALE_WIDTH = lvgl_sys::LV_STYLE_SCALE_WIDTH;
-        const SCALE_BORDER_WIDTH = lvgl_sys::LV_STYLE_SCALE_BORDER_WIDTH;
-        const SCALE_END_BORDER_WIDTH = lvgl_sys::LV_STYLE_SCALE_END_BORDER_WIDTH;
-        const SCALE_END_LINE_WIDTH = lvgl_sys::LV_STYLE_SCALE_END_LINE_WIDTH;
-        const SCALE_GRAD_COLOR = lvgl_sys::LV_STYLE_SCALE_GRAD_COLOR;
-        const SCALE_END_COLOR = lvgl_sys::LV_STYLE_SCALE_END_COLOR;
+        const RADIUS = lvgl_sys::LV_STYLE_RADIUS as u32;
+        const CLIP_CORNER = lvgl_sys::LV_STYLE_CLIP_CORNER as u32;
+        const SIZE = lvgl_sys::LV_STYLE_SIZE as u32;
+        const TRANSFORM_WIDTH = lvgl_sys::LV_STYLE_TRANSFORM_WIDTH as u32;
+        const TRANSFORM_HEIGHT = lvgl_sys::LV_STYLE_TRANSFORM_HEIGHT as u32;
+        const TRANSFORM_ANGLE = lvgl_sys::LV_STYLE_TRANSFORM_ANGLE as u32;
+        const TRANSFORM_ZOOM = lvgl_sys::LV_STYLE_TRANSFORM_ZOOM as u32;
+        const OPA_SCALE = lvgl_sys::LV_STYLE_OPA_SCALE as u32;
+        const PAD_TOP = lvgl_sys::LV_STYLE_PAD_TOP as u32;
+        const PAD_BOTTOM = lvgl_sys::LV_STYLE_PAD_BOTTOM as u32;
+        const PAD_LEFT = lvgl_sys::LV_STYLE_PAD_LEFT as u32;
+        const PAD_RIGHT = lvgl_sys::LV_STYLE_PAD_RIGHT as u32;
+        const PAD_INNER = lvgl_sys::LV_STYLE_PAD_INNER as u32;
+        const MARGIN_TOP = lvgl_sys::LV_STYLE_MARGIN_TOP as u32;
+        const MARGIN_BOTTOM = lvgl_sys::LV_STYLE_MARGIN_BOTTOM as u32;
+        const MARGIN_LEFT = lvgl_sys::LV_STYLE_MARGIN_LEFT as u32;
+        const MARGIN_RIGHT = lvgl_sys::LV_STYLE_MARGIN_RIGHT as u32;
+        const BG_BLEND_MODE = lvgl_sys::LV_STYLE_BG_BLEND_MODE as u32;
+        const BG_MAIN_STOP = lvgl_sys::LV_STYLE_BG_MAIN_STOP as u32;
+        const BG_GRAD_STOP = lvgl_sys::LV_STYLE_BG_GRAD_STOP as u32;
+        const BG_GRAD_DIR = lvgl_sys::LV_STYLE_BG_GRAD_DIR as u32;
+        const BG_COLOR = lvgl_sys::LV_STYLE_BG_COLOR as u32;
+        const BG_GRAD_COLOR = lvgl_sys::LV_STYLE_BG_GRAD_COLOR as u32;
+        const BG_OPA = lvgl_sys::LV_STYLE_BG_OPA as u32;
+        const BORDER_WIDTH = lvgl_sys::LV_STYLE_BORDER_WIDTH as u32;
+        const BORDER_SIDE = lvgl_sys::LV_STYLE_BORDER_SIDE as u32;
+        const BORDER_BLEND_MODE = lvgl_sys::LV_STYLE_BORDER_BLEND_MODE as u32;
+        const BORDER_POST = lvgl_sys::LV_STYLE_BORDER_POST as u32;
+        const BORDER_COLOR = lvgl_sys::LV_STYLE_BORDER_COLOR as u32;
+        const BORDER_OPA = lvgl_sys::LV_STYLE_BORDER_OPA as u32;
+        const OUTLINE_WIDTH = lvgl_sys::LV_STYLE_OUTLINE_WIDTH as u32;
+        const OUTLINE_PAD = lvgl_sys::LV_STYLE_OUTLINE_PAD as u32;
+        const OUTLINE_BLEND_MODE = lvgl_sys::LV_STYLE_OUTLINE_BLEND_MODE as u32;
+        const OUTLINE_COLOR = lvgl_sys::LV_STYLE_OUTLINE_COLOR as u32;
+        const OUTLINE_OPA = lvgl_sys::LV_STYLE_OUTLINE_OPA as u32;
+        const SHADOW_WIDTH = lvgl_sys::LV_STYLE_SHADOW_WIDTH as u32;
+        const SHADOW_OFS_X = lvgl_sys::LV_STYLE_SHADOW_OFS_X as u32;
+        const SHADOW_OFS_Y = lvgl_sys::LV_STYLE_SHADOW_OFS_Y as u32;
+        const SHADOW_SPREAD = lvgl_sys::LV_STYLE_SHADOW_SPREAD as u32;
+        const SHADOW_BLEND_MODE = lvgl_sys::LV_STYLE_SHADOW_BLEND_MODE as u32;
+        const SHADOW_COLOR = lvgl_sys::LV_STYLE_SHADOW_COLOR as u32;
+        const SHADOW_OPA = lvgl_sys::LV_STYLE_SHADOW_OPA as u32;
+        const PATTERN_BLEND_MODE = lvgl_sys::LV_STYLE_PATTERN_BLEND_MODE as u32;
+        const PATTERN_REPEAT = lvgl_sys::LV_STYLE_PATTERN_REPEAT as u32;
+        const PATTERN_RECOLOR = lvgl_sys::LV_STYLE_PATTERN_RECOLOR as u32;
+        const PATTERN_OPA = lvgl_sys::LV_STYLE_PATTERN_OPA as u32;
+        const PATTERN_RECOLOR_OPA = lvgl_sys::LV_STYLE_PATTERN_RECOLOR_OPA as u32;
+        const PATTERN_IMAGE = lvgl_sys::LV_STYLE_PATTERN_IMAGE as u32;
+        const VALUE_LETTER_SPACE = lvgl_sys::LV_STYLE_VALUE_LETTER_SPACE as u32;
+        const VALUE_LINE_SPACE = lvgl_sys::LV_STYLE_VALUE_LINE_SPACE as u32;
+        const VALUE_BLEND_MODE = lvgl_sys::LV_STYLE_VALUE_BLEND_MODE as u32;
+        const VALUE_OFS_X = lvgl_sys::LV_STYLE_VALUE_OFS_X as u32;
+        const VALUE_OFS_Y = lvgl_sys::LV_STYLE_VALUE_OFS_Y as u32;
+        const VALUE_ALIGN = lvgl_sys::LV_STYLE_VALUE_ALIGN as u32;
+        const VALUE_COLOR = lvgl_sys::LV_STYLE_VALUE_COLOR as u32;
+        const VALUE_OPA = lvgl_sys::LV_STYLE_VALUE_OPA as u32;
+        const VALUE_FONT = lvgl_sys::LV_STYLE_VALUE_FONT as u32;
+        const VALUE_STR = lvgl_sys::LV_STYLE_VALUE_STR as u32;
+        const TEXT_LETTER_SPACE = lvgl_sys::LV_STYLE_TEXT_LETTER_SPACE as u32;
+        const TEXT_LINE_SPACE = lvgl_sys::LV_STYLE_TEXT_LINE_SPACE as u32;
+        const TEXT_DECOR = lvgl_sys::LV_STYLE_TEXT_DECOR as u32;
+        const TEXT_BLEND_MODE = lvgl_sys::LV_STYLE_TEXT_BLEND_MODE as u32;
+        const TEXT_COLOR = lvgl_sys::LV_STYLE_TEXT_COLOR as u32;
+        const TEXT_SEL_COLOR = lvgl_sys::LV_STYLE_TEXT_SEL_COLOR as u32;
+        const TEXT_OPA = lvgl_sys::LV_STYLE_TEXT_OPA as u32;
+        const TEXT_FONT = lvgl_sys::LV_STYLE_TEXT_FONT as u32;
+        const LINE_WIDTH = lvgl_sys::LV_STYLE_LINE_WIDTH as u32;
+        const LINE_BLEND_MODE = lvgl_sys::LV_STYLE_LINE_BLEND_MODE as u32;
+        const LINE_DASH_WIDTH = lvgl_sys::LV_STYLE_LINE_DASH_WIDTH as u32;
+        const LINE_DASH_GAP = lvgl_sys::LV_STYLE_LINE_DASH_GAP as u32;
+        const LINE_ROUNDED = lvgl_sys::LV_STYLE_LINE_ROUNDED as u32;
+        const LINE_COLOR = lvgl_sys::LV_STYLE_LINE_COLOR as u32;
+        const LINE_OPA = lvgl_sys::LV_STYLE_LINE_OPA as u32;
+        const IMAGE_BLEND_MODE = lvgl_sys::LV_STYLE_IMAGE_BLEND_MODE as u32;
+        const IMAGE_RECOLOR = lvgl_sys::LV_STYLE_IMAGE_RECOLOR as u32;
+        const IMAGE_OPA = lvgl_sys::LV_STYLE_IMAGE_OPA as u32;
+        const IMAGE_RECOLOR_OPA = lvgl_sys::LV_STYLE_IMAGE_RECOLOR_OPA as u32;
+        const TRANSITION_TIME = lvgl_sys::LV_STYLE_TRANSITION_TIME as u32;
+        const TRANSITION_DELAY = lvgl_sys::LV_STYLE_TRANSITION_DELAY as u32;
+        const TRANSITION_PROP_1 = lvgl_sys::LV_STYLE_TRANSITION_PROP_1 as u32;
+        const TRANSITION_PROP_2 = lvgl_sys::LV_STYLE_TRANSITION_PROP_2 as u32;
+        const TRANSITION_PROP_3 = lvgl_sys::LV_STYLE_TRANSITION_PROP_3 as u32;
+        const TRANSITION_PROP_4 = lvgl_sys::LV_STYLE_TRANSITION_PROP_4 as u32;
+        const TRANSITION_PROP_5 = lvgl_sys::LV_STYLE_TRANSITION_PROP_5 as u32;
+        const TRANSITION_PROP_6 = lvgl_sys::LV_STYLE_TRANSITION_PROP_6 as u32;
+        const TRANSITION_PATH = lvgl_sys::LV_STYLE_TRANSITION_PATH as u32;
+        const SCALE_WIDTH = lvgl_sys::LV_STYLE_SCALE_WIDTH as u32;
+        const SCALE_BORDER_WIDTH = lvgl_sys::LV_STYLE_SCALE_BORDER_WIDTH as u32;
+        const SCALE_END_BORDER_WIDTH = lvgl_sys::LV_STYLE_SCALE_END_BORDER_WIDTH as u32;
+        const SCALE_END_LINE_WIDTH = lvgl_sys::LV_STYLE_SCALE_END_LINE_WIDTH as u32;
+        const SCALE_GRAD_COLOR = lvgl_sys::LV_STYLE_SCALE_GRAD_COLOR as u32;
+        const SCALE_END_COLOR = lvgl_sys::LV_STYLE_SCALE_END_COLOR as u32;
     }
 }
 
@@ -165,8 +166,8 @@ impl Style {
         unsafe {
             lvgl_sys::_lv_style_set_int(
                 self.raw.as_mut(),
-                (lvgl_sys::LV_STYLE_RADIUS | (native_state << lvgl_sys::LV_STYLE_STATE_POS as u32))
-                    as u16,
+                (lvgl_sys::LV_STYLE_RADIUS as u32
+                    | (native_state << lvgl_sys::LV_STYLE_STATE_POS as u32)) as u16,
                 value,
             );
         }
@@ -177,7 +178,7 @@ impl Style {
         unsafe {
             lvgl_sys::_lv_style_set_int(
                 self.raw.as_mut(),
-                (lvgl_sys::LV_STYLE_CLIP_CORNER
+                (lvgl_sys::LV_STYLE_CLIP_CORNER as u32
                     | (native_state << lvgl_sys::LV_STYLE_STATE_POS as u32)) as u16,
                 value,
             );
@@ -189,8 +190,8 @@ impl Style {
         unsafe {
             lvgl_sys::_lv_style_set_int(
                 self.raw.as_mut(),
-                (lvgl_sys::LV_STYLE_SIZE | (native_state << lvgl_sys::LV_STYLE_STATE_POS as u32))
-                    as u16,
+                (lvgl_sys::LV_STYLE_SIZE as u32
+                    | (native_state << lvgl_sys::LV_STYLE_STATE_POS as u32)) as u16,
                 value,
             );
         }
@@ -201,7 +202,7 @@ impl Style {
         unsafe {
             lvgl_sys::_lv_style_set_int(
                 self.raw.as_mut(),
-                (lvgl_sys::LV_STYLE_TRANSFORM_WIDTH
+                (lvgl_sys::LV_STYLE_TRANSFORM_WIDTH as u32
                     | (native_state << lvgl_sys::LV_STYLE_STATE_POS as u32)) as u16,
                 value,
             );
@@ -213,7 +214,7 @@ impl Style {
         unsafe {
             lvgl_sys::_lv_style_set_int(
                 self.raw.as_mut(),
-                (lvgl_sys::LV_STYLE_TRANSFORM_HEIGHT
+                (lvgl_sys::LV_STYLE_TRANSFORM_HEIGHT as u32
                     | (native_state << lvgl_sys::LV_STYLE_STATE_POS as u32)) as u16,
                 value,
             );
@@ -225,7 +226,7 @@ impl Style {
         unsafe {
             lvgl_sys::_lv_style_set_int(
                 self.raw.as_mut(),
-                (lvgl_sys::LV_STYLE_TRANSFORM_ANGLE
+                (lvgl_sys::LV_STYLE_TRANSFORM_ANGLE as u32
                     | (native_state << lvgl_sys::LV_STYLE_STATE_POS as u32)) as u16,
                 value,
             );
@@ -237,7 +238,7 @@ impl Style {
         unsafe {
             lvgl_sys::_lv_style_set_int(
                 self.raw.as_mut(),
-                (lvgl_sys::LV_STYLE_TRANSFORM_ZOOM
+                (lvgl_sys::LV_STYLE_TRANSFORM_ZOOM as u32
                     | (native_state << lvgl_sys::LV_STYLE_STATE_POS as u32)) as u16,
                 value,
             );
@@ -249,7 +250,7 @@ impl Style {
         unsafe {
             lvgl_sys::_lv_style_set_opa(
                 self.raw.as_mut(),
-                (lvgl_sys::LV_STYLE_OPA_SCALE
+                (lvgl_sys::LV_STYLE_OPA_SCALE as u32
                     | (native_state << lvgl_sys::LV_STYLE_STATE_POS as u32)) as u16,
                 value.into(),
             );
@@ -261,8 +262,8 @@ impl Style {
         unsafe {
             lvgl_sys::_lv_style_set_int(
                 self.raw.as_mut(),
-                (lvgl_sys::LV_STYLE_PAD_TOP | (native_state << lvgl_sys::LV_STYLE_STATE_POS as u32))
-                    as u16,
+                (lvgl_sys::LV_STYLE_PAD_TOP as u32
+                    | (native_state << lvgl_sys::LV_STYLE_STATE_POS as u32)) as u16,
                 value,
             );
         }
@@ -273,7 +274,7 @@ impl Style {
         unsafe {
             lvgl_sys::_lv_style_set_int(
                 self.raw.as_mut(),
-                (lvgl_sys::LV_STYLE_PAD_BOTTOM
+                (lvgl_sys::LV_STYLE_PAD_BOTTOM as u32
                     | (native_state << lvgl_sys::LV_STYLE_STATE_POS as u32)) as u16,
                 value,
             );
@@ -285,7 +286,7 @@ impl Style {
         unsafe {
             lvgl_sys::_lv_style_set_int(
                 self.raw.as_mut(),
-                (lvgl_sys::LV_STYLE_PAD_LEFT
+                (lvgl_sys::LV_STYLE_PAD_LEFT as u32
                     | (native_state << lvgl_sys::LV_STYLE_STATE_POS as u32)) as u16,
                 value,
             );
@@ -297,7 +298,7 @@ impl Style {
         unsafe {
             lvgl_sys::_lv_style_set_int(
                 self.raw.as_mut(),
-                (lvgl_sys::LV_STYLE_PAD_RIGHT
+                (lvgl_sys::LV_STYLE_PAD_RIGHT as u32
                     | (native_state << lvgl_sys::LV_STYLE_STATE_POS as u32)) as u16,
                 value,
             );
@@ -309,7 +310,7 @@ impl Style {
         unsafe {
             lvgl_sys::_lv_style_set_int(
                 self.raw.as_mut(),
-                (lvgl_sys::LV_STYLE_PAD_INNER
+                (lvgl_sys::LV_STYLE_PAD_INNER as u32
                     | (native_state << lvgl_sys::LV_STYLE_STATE_POS as u32)) as u16,
                 value,
             );
@@ -321,7 +322,7 @@ impl Style {
         unsafe {
             lvgl_sys::_lv_style_set_int(
                 self.raw.as_mut(),
-                (lvgl_sys::LV_STYLE_MARGIN_TOP
+                (lvgl_sys::LV_STYLE_MARGIN_TOP as u32
                     | (native_state << lvgl_sys::LV_STYLE_STATE_POS as u32)) as u16,
                 value,
             );
@@ -333,7 +334,7 @@ impl Style {
         unsafe {
             lvgl_sys::_lv_style_set_int(
                 self.raw.as_mut(),
-                (lvgl_sys::LV_STYLE_MARGIN_BOTTOM
+                (lvgl_sys::LV_STYLE_MARGIN_BOTTOM as u32
                     | (native_state << lvgl_sys::LV_STYLE_STATE_POS as u32)) as u16,
                 value,
             );
@@ -345,7 +346,7 @@ impl Style {
         unsafe {
             lvgl_sys::_lv_style_set_int(
                 self.raw.as_mut(),
-                (lvgl_sys::LV_STYLE_MARGIN_LEFT
+                (lvgl_sys::LV_STYLE_MARGIN_LEFT as u32
                     | (native_state << lvgl_sys::LV_STYLE_STATE_POS as u32)) as u16,
                 value,
             );
@@ -357,7 +358,7 @@ impl Style {
         unsafe {
             lvgl_sys::_lv_style_set_int(
                 self.raw.as_mut(),
-                (lvgl_sys::LV_STYLE_MARGIN_RIGHT
+                (lvgl_sys::LV_STYLE_MARGIN_RIGHT as u32
                     | (native_state << lvgl_sys::LV_STYLE_STATE_POS as u32)) as u16,
                 value,
             );
@@ -369,7 +370,7 @@ impl Style {
         unsafe {
             lvgl_sys::_lv_style_set_int(
                 self.raw.as_mut(),
-                (lvgl_sys::LV_STYLE_BG_BLEND_MODE
+                (lvgl_sys::LV_STYLE_BG_BLEND_MODE as u32
                     | (native_state << lvgl_sys::LV_STYLE_STATE_POS as u32)) as u16,
                 value,
             );
@@ -381,7 +382,7 @@ impl Style {
         unsafe {
             lvgl_sys::_lv_style_set_int(
                 self.raw.as_mut(),
-                (lvgl_sys::LV_STYLE_BG_MAIN_STOP
+                (lvgl_sys::LV_STYLE_BG_MAIN_STOP as u32
                     | (native_state << lvgl_sys::LV_STYLE_STATE_POS as u32)) as u16,
                 value,
             );
@@ -393,7 +394,7 @@ impl Style {
         unsafe {
             lvgl_sys::_lv_style_set_int(
                 self.raw.as_mut(),
-                (lvgl_sys::LV_STYLE_BG_GRAD_STOP
+                (lvgl_sys::LV_STYLE_BG_GRAD_STOP as u32
                     | (native_state << lvgl_sys::LV_STYLE_STATE_POS as u32)) as u16,
                 value,
             );
@@ -405,7 +406,7 @@ impl Style {
         unsafe {
             lvgl_sys::_lv_style_set_int(
                 self.raw.as_mut(),
-                (lvgl_sys::LV_STYLE_BG_GRAD_DIR
+                (lvgl_sys::LV_STYLE_BG_GRAD_DIR as u32
                     | (native_state << lvgl_sys::LV_STYLE_STATE_POS as u32)) as u16,
                 value,
             );
@@ -417,7 +418,7 @@ impl Style {
         unsafe {
             lvgl_sys::_lv_style_set_color(
                 self.raw.as_mut(),
-                (lvgl_sys::LV_STYLE_BG_COLOR
+                (lvgl_sys::LV_STYLE_BG_COLOR as u32
                     | (native_state << lvgl_sys::LV_STYLE_STATE_POS as u32)) as u16,
                 value.raw,
             );
@@ -429,7 +430,7 @@ impl Style {
         unsafe {
             lvgl_sys::_lv_style_set_color(
                 self.raw.as_mut(),
-                (lvgl_sys::LV_STYLE_BG_GRAD_COLOR
+                (lvgl_sys::LV_STYLE_BG_GRAD_COLOR as u32
                     | (native_state << lvgl_sys::LV_STYLE_STATE_POS as u32)) as u16,
                 value.raw,
             );
@@ -441,8 +442,8 @@ impl Style {
         unsafe {
             lvgl_sys::_lv_style_set_opa(
                 self.raw.as_mut(),
-                (lvgl_sys::LV_STYLE_BG_OPA | (native_state << lvgl_sys::LV_STYLE_STATE_POS as u32))
-                    as u16,
+                (lvgl_sys::LV_STYLE_BG_OPA as u32
+                    | (native_state << lvgl_sys::LV_STYLE_STATE_POS as u32)) as u16,
                 value.into(),
             );
         }
@@ -453,7 +454,7 @@ impl Style {
         unsafe {
             lvgl_sys::_lv_style_set_int(
                 self.raw.as_mut(),
-                (lvgl_sys::LV_STYLE_BORDER_WIDTH
+                (lvgl_sys::LV_STYLE_BORDER_WIDTH as u32
                     | (native_state << lvgl_sys::LV_STYLE_STATE_POS as u32)) as u16,
                 value,
             );
@@ -465,7 +466,7 @@ impl Style {
         unsafe {
             lvgl_sys::_lv_style_set_int(
                 self.raw.as_mut(),
-                (lvgl_sys::LV_STYLE_BORDER_SIDE
+                (lvgl_sys::LV_STYLE_BORDER_SIDE as u32
                     | (native_state << lvgl_sys::LV_STYLE_STATE_POS as u32)) as u16,
                 value,
             );
@@ -477,7 +478,7 @@ impl Style {
         unsafe {
             lvgl_sys::_lv_style_set_int(
                 self.raw.as_mut(),
-                (lvgl_sys::LV_STYLE_BORDER_BLEND_MODE
+                (lvgl_sys::LV_STYLE_BORDER_BLEND_MODE as u32
                     | (native_state << lvgl_sys::LV_STYLE_STATE_POS as u32)) as u16,
                 value,
             );
@@ -489,7 +490,7 @@ impl Style {
         unsafe {
             lvgl_sys::_lv_style_set_int(
                 self.raw.as_mut(),
-                (lvgl_sys::LV_STYLE_BORDER_POST
+                (lvgl_sys::LV_STYLE_BORDER_POST as u32
                     | (native_state << lvgl_sys::LV_STYLE_STATE_POS as u32)) as u16,
                 value,
             );
@@ -501,7 +502,7 @@ impl Style {
         unsafe {
             lvgl_sys::_lv_style_set_color(
                 self.raw.as_mut(),
-                (lvgl_sys::LV_STYLE_BORDER_COLOR
+                (lvgl_sys::LV_STYLE_BORDER_COLOR as u32
                     | (native_state << lvgl_sys::LV_STYLE_STATE_POS as u32)) as u16,
                 value.raw,
             );
@@ -513,7 +514,7 @@ impl Style {
         unsafe {
             lvgl_sys::_lv_style_set_opa(
                 self.raw.as_mut(),
-                (lvgl_sys::LV_STYLE_BORDER_OPA
+                (lvgl_sys::LV_STYLE_BORDER_OPA as u32
                     | (native_state << lvgl_sys::LV_STYLE_STATE_POS as u32)) as u16,
                 value.into(),
             );
@@ -525,7 +526,7 @@ impl Style {
         unsafe {
             lvgl_sys::_lv_style_set_int(
                 self.raw.as_mut(),
-                (lvgl_sys::LV_STYLE_OUTLINE_WIDTH
+                (lvgl_sys::LV_STYLE_OUTLINE_WIDTH as u32
                     | (native_state << lvgl_sys::LV_STYLE_STATE_POS as u32)) as u16,
                 value,
             );
@@ -537,7 +538,7 @@ impl Style {
         unsafe {
             lvgl_sys::_lv_style_set_int(
                 self.raw.as_mut(),
-                (lvgl_sys::LV_STYLE_OUTLINE_PAD
+                (lvgl_sys::LV_STYLE_OUTLINE_PAD as u32
                     | (native_state << lvgl_sys::LV_STYLE_STATE_POS as u32)) as u16,
                 value,
             );
@@ -549,7 +550,7 @@ impl Style {
         unsafe {
             lvgl_sys::_lv_style_set_int(
                 self.raw.as_mut(),
-                (lvgl_sys::LV_STYLE_OUTLINE_BLEND_MODE
+                (lvgl_sys::LV_STYLE_OUTLINE_BLEND_MODE as u32
                     | (native_state << lvgl_sys::LV_STYLE_STATE_POS as u32)) as u16,
                 value,
             );
@@ -561,7 +562,7 @@ impl Style {
         unsafe {
             lvgl_sys::_lv_style_set_color(
                 self.raw.as_mut(),
-                (lvgl_sys::LV_STYLE_OUTLINE_COLOR
+                (lvgl_sys::LV_STYLE_OUTLINE_COLOR as u32
                     | (native_state << lvgl_sys::LV_STYLE_STATE_POS as u32)) as u16,
                 value.raw,
             );
@@ -573,7 +574,7 @@ impl Style {
         unsafe {
             lvgl_sys::_lv_style_set_opa(
                 self.raw.as_mut(),
-                (lvgl_sys::LV_STYLE_OUTLINE_OPA
+                (lvgl_sys::LV_STYLE_OUTLINE_OPA as u32
                     | (native_state << lvgl_sys::LV_STYLE_STATE_POS as u32)) as u16,
                 value.into(),
             );
@@ -585,7 +586,7 @@ impl Style {
         unsafe {
             lvgl_sys::_lv_style_set_int(
                 self.raw.as_mut(),
-                (lvgl_sys::LV_STYLE_SHADOW_WIDTH
+                (lvgl_sys::LV_STYLE_SHADOW_WIDTH as u32
                     | (native_state << lvgl_sys::LV_STYLE_STATE_POS as u32)) as u16,
                 value,
             );
@@ -597,7 +598,7 @@ impl Style {
         unsafe {
             lvgl_sys::_lv_style_set_int(
                 self.raw.as_mut(),
-                (lvgl_sys::LV_STYLE_SHADOW_OFS_X
+                (lvgl_sys::LV_STYLE_SHADOW_OFS_X as u32
                     | (native_state << lvgl_sys::LV_STYLE_STATE_POS as u32)) as u16,
                 value,
             );
@@ -609,7 +610,7 @@ impl Style {
         unsafe {
             lvgl_sys::_lv_style_set_int(
                 self.raw.as_mut(),
-                (lvgl_sys::LV_STYLE_SHADOW_OFS_Y
+                (lvgl_sys::LV_STYLE_SHADOW_OFS_Y as u32
                     | (native_state << lvgl_sys::LV_STYLE_STATE_POS as u32)) as u16,
                 value,
             );
@@ -621,7 +622,7 @@ impl Style {
         unsafe {
             lvgl_sys::_lv_style_set_int(
                 self.raw.as_mut(),
-                (lvgl_sys::LV_STYLE_SHADOW_SPREAD
+                (lvgl_sys::LV_STYLE_SHADOW_SPREAD as u32
                     | (native_state << lvgl_sys::LV_STYLE_STATE_POS as u32)) as u16,
                 value,
             );
@@ -633,7 +634,7 @@ impl Style {
         unsafe {
             lvgl_sys::_lv_style_set_int(
                 self.raw.as_mut(),
-                (lvgl_sys::LV_STYLE_SHADOW_BLEND_MODE
+                (lvgl_sys::LV_STYLE_SHADOW_BLEND_MODE as u32
                     | (native_state << lvgl_sys::LV_STYLE_STATE_POS as u32)) as u16,
                 value,
             );
@@ -645,7 +646,7 @@ impl Style {
         unsafe {
             lvgl_sys::_lv_style_set_color(
                 self.raw.as_mut(),
-                (lvgl_sys::LV_STYLE_SHADOW_COLOR
+                (lvgl_sys::LV_STYLE_SHADOW_COLOR as u32
                     | (native_state << lvgl_sys::LV_STYLE_STATE_POS as u32)) as u16,
                 value.raw,
             );
@@ -657,7 +658,7 @@ impl Style {
         unsafe {
             lvgl_sys::_lv_style_set_opa(
                 self.raw.as_mut(),
-                (lvgl_sys::LV_STYLE_SHADOW_OPA
+                (lvgl_sys::LV_STYLE_SHADOW_OPA as u32
                     | (native_state << lvgl_sys::LV_STYLE_STATE_POS as u32)) as u16,
                 value.into(),
             );
@@ -669,7 +670,7 @@ impl Style {
         unsafe {
             lvgl_sys::_lv_style_set_int(
                 self.raw.as_mut(),
-                (lvgl_sys::LV_STYLE_PATTERN_REPEAT
+                (lvgl_sys::LV_STYLE_PATTERN_REPEAT as u32
                     | (native_state << lvgl_sys::LV_STYLE_STATE_POS as u32)) as u16,
                 value,
             );
@@ -681,7 +682,7 @@ impl Style {
         unsafe {
             lvgl_sys::_lv_style_set_int(
                 self.raw.as_mut(),
-                (lvgl_sys::LV_STYLE_PATTERN_BLEND_MODE
+                (lvgl_sys::LV_STYLE_PATTERN_BLEND_MODE as u32
                     | (native_state << lvgl_sys::LV_STYLE_STATE_POS as u32)) as u16,
                 value,
             );
@@ -693,7 +694,7 @@ impl Style {
         unsafe {
             lvgl_sys::_lv_style_set_color(
                 self.raw.as_mut(),
-                (lvgl_sys::LV_STYLE_PATTERN_RECOLOR
+                (lvgl_sys::LV_STYLE_PATTERN_RECOLOR as u32
                     | (native_state << lvgl_sys::LV_STYLE_STATE_POS as u32)) as u16,
                 value.raw,
             );
@@ -705,7 +706,7 @@ impl Style {
         unsafe {
             lvgl_sys::_lv_style_set_opa(
                 self.raw.as_mut(),
-                (lvgl_sys::LV_STYLE_PATTERN_OPA
+                (lvgl_sys::LV_STYLE_PATTERN_OPA as u32
                     | (native_state << lvgl_sys::LV_STYLE_STATE_POS as u32)) as u16,
                 value.into(),
             );
@@ -717,7 +718,7 @@ impl Style {
         unsafe {
             lvgl_sys::_lv_style_set_opa(
                 self.raw.as_mut(),
-                (lvgl_sys::LV_STYLE_PATTERN_RECOLOR_OPA
+                (lvgl_sys::LV_STYLE_PATTERN_RECOLOR_OPA as u32
                     | (native_state << lvgl_sys::LV_STYLE_STATE_POS as u32)) as u16,
                 value.into(),
             );
@@ -729,7 +730,7 @@ impl Style {
         unsafe {
             lvgl_sys::_lv_style_set_int(
                 self.raw.as_mut(),
-                (lvgl_sys::LV_STYLE_VALUE_LETTER_SPACE
+                (lvgl_sys::LV_STYLE_VALUE_LETTER_SPACE as u32
                     | (native_state << lvgl_sys::LV_STYLE_STATE_POS as u32)) as u16,
                 value,
             );
@@ -741,7 +742,7 @@ impl Style {
         unsafe {
             lvgl_sys::_lv_style_set_int(
                 self.raw.as_mut(),
-                (lvgl_sys::LV_STYLE_VALUE_LINE_SPACE
+                (lvgl_sys::LV_STYLE_VALUE_LINE_SPACE as u32
                     | (native_state << lvgl_sys::LV_STYLE_STATE_POS as u32)) as u16,
                 value,
             );
@@ -753,7 +754,7 @@ impl Style {
         unsafe {
             lvgl_sys::_lv_style_set_int(
                 self.raw.as_mut(),
-                (lvgl_sys::LV_STYLE_VALUE_BLEND_MODE
+                (lvgl_sys::LV_STYLE_VALUE_BLEND_MODE as u32
                     | (native_state << lvgl_sys::LV_STYLE_STATE_POS as u32)) as u16,
                 value,
             );
@@ -765,7 +766,7 @@ impl Style {
         unsafe {
             lvgl_sys::_lv_style_set_int(
                 self.raw.as_mut(),
-                (lvgl_sys::LV_STYLE_VALUE_OFS_X
+                (lvgl_sys::LV_STYLE_VALUE_OFS_X as u32
                     | (native_state << lvgl_sys::LV_STYLE_STATE_POS as u32)) as u16,
                 value,
             );
@@ -777,7 +778,7 @@ impl Style {
         unsafe {
             lvgl_sys::_lv_style_set_int(
                 self.raw.as_mut(),
-                (lvgl_sys::LV_STYLE_VALUE_OFS_Y
+                (lvgl_sys::LV_STYLE_VALUE_OFS_Y as u32
                     | (native_state << lvgl_sys::LV_STYLE_STATE_POS as u32)) as u16,
                 value,
             );
@@ -789,7 +790,7 @@ impl Style {
         unsafe {
             lvgl_sys::_lv_style_set_int(
                 self.raw.as_mut(),
-                (lvgl_sys::LV_STYLE_VALUE_ALIGN
+                (lvgl_sys::LV_STYLE_VALUE_ALIGN as u32
                     | (native_state << lvgl_sys::LV_STYLE_STATE_POS as u32)) as u16,
                 value,
             );
@@ -801,7 +802,7 @@ impl Style {
         unsafe {
             lvgl_sys::_lv_style_set_color(
                 self.raw.as_mut(),
-                (lvgl_sys::LV_STYLE_VALUE_COLOR
+                (lvgl_sys::LV_STYLE_VALUE_COLOR as u32
                     | (native_state << lvgl_sys::LV_STYLE_STATE_POS as u32)) as u16,
                 value.raw,
             );
@@ -813,7 +814,7 @@ impl Style {
         unsafe {
             lvgl_sys::_lv_style_set_opa(
                 self.raw.as_mut(),
-                (lvgl_sys::LV_STYLE_VALUE_OPA
+                (lvgl_sys::LV_STYLE_VALUE_OPA as u32
                     | (native_state << lvgl_sys::LV_STYLE_STATE_POS as u32)) as u16,
                 value.into(),
             );
@@ -825,7 +826,7 @@ impl Style {
         unsafe {
             lvgl_sys::_lv_style_set_int(
                 self.raw.as_mut(),
-                (lvgl_sys::LV_STYLE_TEXT_LETTER_SPACE
+                (lvgl_sys::LV_STYLE_TEXT_LETTER_SPACE as u32
                     | (native_state << lvgl_sys::LV_STYLE_STATE_POS as u32)) as u16,
                 value,
             );
@@ -837,7 +838,7 @@ impl Style {
         unsafe {
             lvgl_sys::_lv_style_set_int(
                 self.raw.as_mut(),
-                (lvgl_sys::LV_STYLE_TEXT_LINE_SPACE
+                (lvgl_sys::LV_STYLE_TEXT_LINE_SPACE as u32
                     | (native_state << lvgl_sys::LV_STYLE_STATE_POS as u32)) as u16,
                 value,
             );
@@ -849,7 +850,7 @@ impl Style {
         unsafe {
             lvgl_sys::_lv_style_set_int(
                 self.raw.as_mut(),
-                (lvgl_sys::LV_STYLE_TEXT_DECOR
+                (lvgl_sys::LV_STYLE_TEXT_DECOR as u32
                     | (native_state << lvgl_sys::LV_STYLE_STATE_POS as u32)) as u16,
                 value,
             );
@@ -861,7 +862,7 @@ impl Style {
         unsafe {
             lvgl_sys::_lv_style_set_int(
                 self.raw.as_mut(),
-                (lvgl_sys::LV_STYLE_TEXT_BLEND_MODE
+                (lvgl_sys::LV_STYLE_TEXT_BLEND_MODE as u32
                     | (native_state << lvgl_sys::LV_STYLE_STATE_POS as u32)) as u16,
                 value,
             );
@@ -873,7 +874,7 @@ impl Style {
         unsafe {
             lvgl_sys::_lv_style_set_color(
                 self.raw.as_mut(),
-                (lvgl_sys::LV_STYLE_TEXT_COLOR
+                (lvgl_sys::LV_STYLE_TEXT_COLOR as u32
                     | (native_state << lvgl_sys::LV_STYLE_STATE_POS as u32)) as u16,
                 value.raw,
             );
@@ -885,7 +886,7 @@ impl Style {
         unsafe {
             lvgl_sys::_lv_style_set_color(
                 self.raw.as_mut(),
-                (lvgl_sys::LV_STYLE_TEXT_SEL_COLOR
+                (lvgl_sys::LV_STYLE_TEXT_SEL_COLOR as u32
                     | (native_state << lvgl_sys::LV_STYLE_STATE_POS as u32)) as u16,
                 value.raw,
             );
@@ -897,7 +898,7 @@ impl Style {
         unsafe {
             lvgl_sys::_lv_style_set_opa(
                 self.raw.as_mut(),
-                (lvgl_sys::LV_STYLE_TEXT_OPA
+                (lvgl_sys::LV_STYLE_TEXT_OPA as u32
                     | (native_state << lvgl_sys::LV_STYLE_STATE_POS as u32)) as u16,
                 value.into(),
             );
@@ -909,7 +910,7 @@ impl Style {
         unsafe {
             lvgl_sys::_lv_style_set_int(
                 self.raw.as_mut(),
-                (lvgl_sys::LV_STYLE_LINE_WIDTH
+                (lvgl_sys::LV_STYLE_LINE_WIDTH as u32
                     | (native_state << lvgl_sys::LV_STYLE_STATE_POS as u32)) as u16,
                 value,
             );
@@ -921,7 +922,7 @@ impl Style {
         unsafe {
             lvgl_sys::_lv_style_set_int(
                 self.raw.as_mut(),
-                (lvgl_sys::LV_STYLE_LINE_BLEND_MODE
+                (lvgl_sys::LV_STYLE_LINE_BLEND_MODE as u32
                     | (native_state << lvgl_sys::LV_STYLE_STATE_POS as u32)) as u16,
                 value,
             );
@@ -933,7 +934,7 @@ impl Style {
         unsafe {
             lvgl_sys::_lv_style_set_int(
                 self.raw.as_mut(),
-                (lvgl_sys::LV_STYLE_LINE_DASH_WIDTH
+                (lvgl_sys::LV_STYLE_LINE_DASH_WIDTH as u32
                     | (native_state << lvgl_sys::LV_STYLE_STATE_POS as u32)) as u16,
                 value,
             );
@@ -945,7 +946,7 @@ impl Style {
         unsafe {
             lvgl_sys::_lv_style_set_int(
                 self.raw.as_mut(),
-                (lvgl_sys::LV_STYLE_LINE_DASH_GAP
+                (lvgl_sys::LV_STYLE_LINE_DASH_GAP as u32
                     | (native_state << lvgl_sys::LV_STYLE_STATE_POS as u32)) as u16,
                 value,
             );
@@ -957,7 +958,7 @@ impl Style {
         unsafe {
             lvgl_sys::_lv_style_set_int(
                 self.raw.as_mut(),
-                (lvgl_sys::LV_STYLE_LINE_ROUNDED
+                (lvgl_sys::LV_STYLE_LINE_ROUNDED as u32
                     | (native_state << lvgl_sys::LV_STYLE_STATE_POS as u32)) as u16,
                 value,
             );
@@ -969,7 +970,7 @@ impl Style {
         unsafe {
             lvgl_sys::_lv_style_set_color(
                 self.raw.as_mut(),
-                (lvgl_sys::LV_STYLE_LINE_COLOR
+                (lvgl_sys::LV_STYLE_LINE_COLOR as u32
                     | (native_state << lvgl_sys::LV_STYLE_STATE_POS as u32)) as u16,
                 value.raw,
             );
@@ -981,7 +982,7 @@ impl Style {
         unsafe {
             lvgl_sys::_lv_style_set_opa(
                 self.raw.as_mut(),
-                (lvgl_sys::LV_STYLE_LINE_OPA
+                (lvgl_sys::LV_STYLE_LINE_OPA as u32
                     | (native_state << lvgl_sys::LV_STYLE_STATE_POS as u32)) as u16,
                 value.into(),
             );
@@ -993,7 +994,7 @@ impl Style {
         unsafe {
             lvgl_sys::_lv_style_set_int(
                 self.raw.as_mut(),
-                (lvgl_sys::LV_STYLE_IMAGE_BLEND_MODE
+                (lvgl_sys::LV_STYLE_IMAGE_BLEND_MODE as u32
                     | (native_state << lvgl_sys::LV_STYLE_STATE_POS as u32)) as u16,
                 value,
             );
@@ -1005,7 +1006,7 @@ impl Style {
         unsafe {
             lvgl_sys::_lv_style_set_color(
                 self.raw.as_mut(),
-                (lvgl_sys::LV_STYLE_IMAGE_RECOLOR
+                (lvgl_sys::LV_STYLE_IMAGE_RECOLOR as u32
                     | (native_state << lvgl_sys::LV_STYLE_STATE_POS as u32)) as u16,
                 value.raw,
             );
@@ -1017,7 +1018,7 @@ impl Style {
         unsafe {
             lvgl_sys::_lv_style_set_opa(
                 self.raw.as_mut(),
-                (lvgl_sys::LV_STYLE_IMAGE_OPA
+                (lvgl_sys::LV_STYLE_IMAGE_OPA as u32
                     | (native_state << lvgl_sys::LV_STYLE_STATE_POS as u32)) as u16,
                 value.into(),
             );
@@ -1029,7 +1030,7 @@ impl Style {
         unsafe {
             lvgl_sys::_lv_style_set_opa(
                 self.raw.as_mut(),
-                (lvgl_sys::LV_STYLE_IMAGE_RECOLOR_OPA
+                (lvgl_sys::LV_STYLE_IMAGE_RECOLOR_OPA as u32
                     | (native_state << lvgl_sys::LV_STYLE_STATE_POS as u32)) as u16,
                 value.into(),
             );
@@ -1041,7 +1042,7 @@ impl Style {
         unsafe {
             lvgl_sys::_lv_style_set_int(
                 self.raw.as_mut(),
-                (lvgl_sys::LV_STYLE_TRANSITION_TIME
+                (lvgl_sys::LV_STYLE_TRANSITION_TIME as u32
                     | (native_state << lvgl_sys::LV_STYLE_STATE_POS as u32)) as u16,
                 value,
             );
@@ -1053,7 +1054,7 @@ impl Style {
         unsafe {
             lvgl_sys::_lv_style_set_int(
                 self.raw.as_mut(),
-                (lvgl_sys::LV_STYLE_TRANSITION_DELAY
+                (lvgl_sys::LV_STYLE_TRANSITION_DELAY as u32
                     | (native_state << lvgl_sys::LV_STYLE_STATE_POS as u32)) as u16,
                 value,
             );
@@ -1065,7 +1066,7 @@ impl Style {
         unsafe {
             lvgl_sys::_lv_style_set_int(
                 self.raw.as_mut(),
-                (lvgl_sys::LV_STYLE_TRANSITION_PROP_1
+                (lvgl_sys::LV_STYLE_TRANSITION_PROP_1 as u32
                     | (native_state << lvgl_sys::LV_STYLE_STATE_POS as u32)) as u16,
                 value,
             );
@@ -1077,7 +1078,7 @@ impl Style {
         unsafe {
             lvgl_sys::_lv_style_set_int(
                 self.raw.as_mut(),
-                (lvgl_sys::LV_STYLE_TRANSITION_PROP_2
+                (lvgl_sys::LV_STYLE_TRANSITION_PROP_2 as u32
                     | (native_state << lvgl_sys::LV_STYLE_STATE_POS as u32)) as u16,
                 value,
             );
@@ -1089,7 +1090,7 @@ impl Style {
         unsafe {
             lvgl_sys::_lv_style_set_int(
                 self.raw.as_mut(),
-                (lvgl_sys::LV_STYLE_TRANSITION_PROP_3
+                (lvgl_sys::LV_STYLE_TRANSITION_PROP_3 as u32
                     | (native_state << lvgl_sys::LV_STYLE_STATE_POS as u32)) as u16,
                 value,
             );
@@ -1101,7 +1102,7 @@ impl Style {
         unsafe {
             lvgl_sys::_lv_style_set_int(
                 self.raw.as_mut(),
-                (lvgl_sys::LV_STYLE_TRANSITION_PROP_4
+                (lvgl_sys::LV_STYLE_TRANSITION_PROP_4 as u32
                     | (native_state << lvgl_sys::LV_STYLE_STATE_POS as u32)) as u16,
                 value,
             );
@@ -1113,7 +1114,7 @@ impl Style {
         unsafe {
             lvgl_sys::_lv_style_set_int(
                 self.raw.as_mut(),
-                (lvgl_sys::LV_STYLE_TRANSITION_PROP_5
+                (lvgl_sys::LV_STYLE_TRANSITION_PROP_5 as u32
                     | (native_state << lvgl_sys::LV_STYLE_STATE_POS as u32)) as u16,
                 value,
             );
@@ -1125,7 +1126,7 @@ impl Style {
         unsafe {
             lvgl_sys::_lv_style_set_int(
                 self.raw.as_mut(),
-                (lvgl_sys::LV_STYLE_TRANSITION_PROP_6
+                (lvgl_sys::LV_STYLE_TRANSITION_PROP_6 as u32
                     | (native_state << lvgl_sys::LV_STYLE_STATE_POS as u32)) as u16,
                 value,
             );
@@ -1137,7 +1138,7 @@ impl Style {
         unsafe {
             lvgl_sys::_lv_style_set_int(
                 self.raw.as_mut(),
-                (lvgl_sys::LV_STYLE_SCALE_WIDTH
+                (lvgl_sys::LV_STYLE_SCALE_WIDTH as u32
                     | (native_state << lvgl_sys::LV_STYLE_STATE_POS as u32)) as u16,
                 value,
             );
@@ -1149,7 +1150,7 @@ impl Style {
         unsafe {
             lvgl_sys::_lv_style_set_int(
                 self.raw.as_mut(),
-                (lvgl_sys::LV_STYLE_SCALE_BORDER_WIDTH
+                (lvgl_sys::LV_STYLE_SCALE_BORDER_WIDTH as u32
                     | (native_state << lvgl_sys::LV_STYLE_STATE_POS as u32)) as u16,
                 value,
             );
@@ -1161,7 +1162,7 @@ impl Style {
         unsafe {
             lvgl_sys::_lv_style_set_int(
                 self.raw.as_mut(),
-                (lvgl_sys::LV_STYLE_SCALE_END_BORDER_WIDTH
+                (lvgl_sys::LV_STYLE_SCALE_END_BORDER_WIDTH as u32
                     | (native_state << lvgl_sys::LV_STYLE_STATE_POS as u32)) as u16,
                 value,
             );
@@ -1173,7 +1174,7 @@ impl Style {
         unsafe {
             lvgl_sys::_lv_style_set_int(
                 self.raw.as_mut(),
-                (lvgl_sys::LV_STYLE_SCALE_END_LINE_WIDTH
+                (lvgl_sys::LV_STYLE_SCALE_END_LINE_WIDTH as u32
                     | (native_state << lvgl_sys::LV_STYLE_STATE_POS as u32)) as u16,
                 value,
             );
@@ -1185,8 +1186,8 @@ impl Style {
         unsafe {
             lvgl_sys::_lv_style_set_color(
                 self.raw.as_mut(),
-                (lvgl_sys::LV_STYLE_SCALE_GRAD_COLOR
-                    | (native_state << lvgl_sys::LV_STYLE_STATE_POS as u32)) as u16,
+                (lvgl_sys::LV_STYLE_SCALE_GRAD_COLOR as u32
+                    | (native_state << lvgl_sys::LV_STYLE_STATE_POS)) as u16,
                 value.raw,
             );
         }
@@ -1197,8 +1198,8 @@ impl Style {
         unsafe {
             lvgl_sys::_lv_style_set_color(
                 self.raw.as_mut(),
-                (lvgl_sys::LV_STYLE_SCALE_END_COLOR
-                    | (native_state << lvgl_sys::LV_STYLE_STATE_POS as u32)) as u16,
+                (lvgl_sys::LV_STYLE_SCALE_END_COLOR as u32
+                    | (native_state << lvgl_sys::LV_STYLE_STATE_POS)) as u16,
                 value.raw,
             );
         }

lvgl/src/mem.rs

@@ -1,13 +1,17 @@
-use crate::{LvError, LvResult};
 use core::mem;
 use core::ops::{Deref, DerefMut};
 use core::ptr::NonNull;
 
-/// Places `T` into LVGL memory.
+/// Places a sized `T` into LVGL memory.
+///
+/// This is useful for cases when we need to allocate memory on Rust side
+/// and handover the management of that memory to LVGL. May also be used in cases we
+/// want to use dynamic memory in the Rust side.
 pub(crate) struct Box<T>(NonNull<T>);
 
 impl<T> Box<T> {
-    pub fn new(inner: T) -> LvResult<Box<T>> {
+    /// Allocate memory using LVGL memory API and place `T` in the LVGL tracked memory.
+    pub fn new(value: T) -> Box<T> {
         let size = mem::size_of::<T>();
         let inner = unsafe {
             let ptr = lvgl_sys::lv_mem_alloc(size as lvgl_sys::size_t) as *mut T;
@@ -19,17 +23,16 @@ impl<T> Box<T> {
                 "Memory address not aligned!"
             );
 
-            match NonNull::new(ptr) {
-                Some(v) => {
-                    // Move `T` to LVGL managed memory
-                    // It will panic if LVGL memory is not aligned
-                    ptr.write(inner);
-                    Ok(v)
-                }
-                None => Err(LvError::LvOOMemory),
-            }
+            NonNull::new(ptr)
+                .map(|p| {
+                    p.as_ptr().write(value);
+                    p
+                })
+                .unwrap_or_else(|| {
+                    panic!("Could not allocate memory {} bytes", size);
+                })
         };
-        Ok(Box(inner?))
+        Box(inner)
     }
 
     pub fn into_raw(self) -> *mut T {
@@ -66,35 +69,30 @@ impl<T> AsMut<T> for Box<T> {
     }
 }
 
+impl<T: Clone> Clone for Box<T> {
+    fn clone(&self) -> Self {
+        unsafe { Self::new(self.0.as_ref().clone()) }
+    }
+}
+
 #[cfg(test)]
 mod test {
     use super::*;
-    use core::mem::MaybeUninit;
-    use std::sync::Once;
-
-    static INIT_LVGL: Once = Once::new();
-
-    fn init() {
-        INIT_LVGL.call_once(|| {
-            unsafe {
-                lvgl_sys::lv_init();
-            };
-        });
-    }
+    use std::vec::Vec;
 
     #[test]
     fn place_value_in_lv_mem() {
-        init();
+        crate::lvgl_init();
 
-        let v = Box::new(5).unwrap();
+        let v = Box::new(5);
         drop(v);
-        let v = Box::new(10).unwrap();
+        let v = Box::new(10);
         drop(v);
     }
 
     #[test]
     fn place_complex_value_in_lv_mem() {
-        init();
+        crate::lvgl_init();
 
         #[repr(C)]
         #[derive(Debug)]
@@ -105,6 +103,9 @@ mod test {
             disp: i32,
         }
 
+        let initial_mem_info = mem_info();
+
+        let mut keep = Vec::new();
         for i in 0..100 {
             let p = Point {
                 x: i,
@@ -114,31 +115,60 @@ mod test {
             };
 
             println!("{:?}", p);
-            let mut b = Box::new(p).unwrap_or_else(|_| {
-                print_mem_info();
-                panic!("OOM");
-            });
+            let mut b = Box::new(p);
 
             println!("memory address is {:p}", b.as_mut());
 
             let point = b.as_mut();
             if point.x != i {
-                print_mem_info();
-
                 println!("{:?}", point);
             }
             assert_eq!(point.x, i);
+
+            let info = mem_info();
+            println!("mem info: {:?}", &info);
+            keep.push(b);
         }
+        drop(keep);
+
+        unsafe {
+            lvgl_sys::lv_mem_defrag();
+        }
+
+        let final_info = mem_info();
+        println!("mem info: {:?}", &final_info);
+
+        // If this fails, we are leaking memory! BOOM! \o/
+        assert_eq!(initial_mem_info.free_size, final_info.free_size)
     }
 
-    fn print_mem_info() {
-        let mut info = MaybeUninit::uninit();
+    #[test]
+    fn clone_object_in_lv_mem() {
+        crate::lvgl_init();
+
+        let v1 = Box::new(5);
+        let v2 = v1.clone();
+
+        // Ensure that the two objects have identical values.
+        assert_eq!(*v1, *v2);
+        // They should have different memory addresses, however.
+        assert_ne!(v1.into_raw() as usize, v2.into_raw() as usize);
+    }
+
+    fn mem_info() -> lvgl_sys::lv_mem_monitor_t {
+        let mut info = lvgl_sys::lv_mem_monitor_t {
+            total_size: 0,
+            free_cnt: 0,
+            free_size: 0,
+            free_biggest_size: 0,
+            used_cnt: 0,
+            max_used: 0,
+            used_pct: 0,
+            frag_pct: 0,
+        };
         unsafe {
-            lvgl_sys::lv_mem_monitor(info.as_mut_ptr());
-        }
-        if !info.as_ptr().is_null() {
-            let info = unsafe { info.assume_init() };
-            println!("mem info: {:?}", info);
+            lvgl_sys::lv_mem_monitor(&mut info as *mut _);
         }
+        info
     }
 }

lvgl/src/support.rs

@@ -27,6 +27,18 @@ impl Color {
     pub fn from_raw(raw: lvgl_sys::lv_color_t) -> Self {
         Self { raw }
     }
+
+    pub fn r(&self) -> u8 {
+        unsafe { lvgl_sys::_LV_COLOR_GET_R(self.raw) as u8 }
+    }
+
+    pub fn g(&self) -> u8 {
+        unsafe { lvgl_sys::_LV_COLOR_GET_G(self.raw) as u8 }
+    }
+
+    pub fn b(&self) -> u8 {
+        unsafe { lvgl_sys::_LV_COLOR_GET_B(self.raw) as u8 }
+    }
 }
 
 impl From<Color> for Rgb888 {
@@ -53,7 +65,7 @@ impl From<Color> for Rgb565 {
     }
 }
 
-/// Events are triggered in LittlevGL when something happens which might be interesting to
+/// Events are triggered in LVGL when something happens which might be interesting to
 /// the user, e.g. if an object:
 ///  - is clicked
 ///  - is dragged
@@ -100,23 +112,25 @@ impl<S> TryFrom<lvgl_sys::lv_event_t> for Event<S> {
     type Error = ();
 
     fn try_from(value: u8) -> Result<Self, Self::Error> {
+        const LV_EVENT_PRESSED: u32 = lvgl_sys::LV_EVENT_PRESSED as u32;
+        const LV_EVENT_PRESSING: u32 = lvgl_sys::LV_EVENT_PRESSING as u32;
+        const LV_EVENT_PRESS_LOST: u32 = lvgl_sys::LV_EVENT_PRESS_LOST as u32;
+        const LV_EVENT_SHORT_CLICKED: u32 = lvgl_sys::LV_EVENT_SHORT_CLICKED as u32;
+        const LV_EVENT_CLICKED: u32 = lvgl_sys::LV_EVENT_CLICKED as u32;
+        const LV_EVENT_LONG_PRESSED: u32 = lvgl_sys::LV_EVENT_LONG_PRESSED as u32;
+        const LV_EVENT_LONG_PRESSED_REPEAT: u32 = lvgl_sys::LV_EVENT_LONG_PRESSED_REPEAT as u32;
+        const LV_EVENT_RELEASED: u32 = lvgl_sys::LV_EVENT_RELEASED as u32;
+
         match value as u32 {
-            lvgl_sys::LV_EVENT_PRESSED => Ok(Event::Pressed),
-            lvgl_sys::LV_EVENT_PRESSING => Ok(Event::Pressing),
-            lvgl_sys::LV_EVENT_PRESS_LOST => Ok(Event::PressLost),
-            lvgl_sys::LV_EVENT_SHORT_CLICKED => Ok(Event::ShortClicked),
-            lvgl_sys::LV_EVENT_CLICKED => Ok(Event::Clicked),
-            lvgl_sys::LV_EVENT_LONG_PRESSED => Ok(Event::LongPressed),
-            lvgl_sys::LV_EVENT_LONG_PRESSED_REPEAT => Ok(Event::LongPressedRepeat),
-            lvgl_sys::LV_EVENT_RELEASED => Ok(Event::Released),
+            LV_EVENT_PRESSED => Ok(Event::Pressed),
+            LV_EVENT_PRESSING => Ok(Event::Pressing),
+            LV_EVENT_PRESS_LOST => Ok(Event::PressLost),
+            LV_EVENT_SHORT_CLICKED => Ok(Event::ShortClicked),
+            LV_EVENT_CLICKED => Ok(Event::Clicked),
+            LV_EVENT_LONG_PRESSED => Ok(Event::LongPressed),
+            LV_EVENT_LONG_PRESSED_REPEAT => Ok(Event::LongPressedRepeat),
+            LV_EVENT_RELEASED => Ok(Event::Released),
             _ => Err(()),
-            // _ => {
-            //     if let Ok(special_event_type) = S::try_from(value) {
-            //         Ok(Event::Special(special_event_type))
-            //     } else {
-            //         Err(())
-            //     }
-            // }
         }
     }
 }
@@ -189,9 +203,9 @@ pub enum Align {
     OutRightBottom,
 }
 
-impl Into<u8> for Align {
-    fn into(self) -> u8 {
-        let native = match self {
+impl From<Align> for u8 {
+    fn from(self_: Align) -> u8 {
+        let native = match self_ {
             Align::Center => lvgl_sys::LV_ALIGN_CENTER,
             Align::InTopLeft => lvgl_sys::LV_ALIGN_IN_TOP_LEFT,
             Align::InTopMid => lvgl_sys::LV_ALIGN_IN_TOP_MID,
@@ -231,3 +245,23 @@ impl From<Animation> for lvgl_sys::lv_anim_enable_t {
         }
     }
 }
+
+#[cfg(test)]
+mod test {
+    use super::*;
+
+    #[test]
+    fn color_properties_accessible() {
+        let color = Color::from_rgb((206, 51, 255));
+
+        if lvgl_sys::LV_COLOR_DEPTH == 32 {
+            assert_eq!(color.r(), 206);
+            assert_eq!(color.g(), 51);
+            assert_eq!(color.b(), 255);
+        } else if lvgl_sys::LV_COLOR_DEPTH == 16 {
+            assert_eq!(color.r(), 25);
+            assert_eq!(color.g(), 12);
+            assert_eq!(color.b(), 31);
+        }
+    }
+}

lvgl/src/ui.rs

@@ -1,4 +1,4 @@
-use crate::mem::Box;
+use crate::Box;
 use crate::{Color, Event, LvError, LvResult, Obj, Widget};
 use core::marker::PhantomData;
 use core::mem::MaybeUninit;
@@ -6,11 +6,11 @@ use core::ptr;
 use core::ptr::NonNull;
 use core::sync::atomic::{AtomicBool, Ordering};
 use core::time::Duration;
-use embedded_graphics::pixelcolor::PixelColor;
+use embedded_graphics::draw_target::DrawTarget;
 use embedded_graphics::prelude::*;
-use embedded_graphics::{drawable, DrawTarget};
+use embedded_graphics::{pixelcolor::PixelColor, Pixel};
 
-// There can only be a single reference to LittlevGL library.
+// There can only be a single reference to LVGL library.
 static LVGL_IN_USE: AtomicBool = AtomicBool::new(false);
 
 // TODO: Make this an external configuration
@@ -20,33 +20,34 @@ pub(crate) const BUF_SIZE: usize = lvgl_sys::LV_HOR_RES_MAX as usize * REFRESH_B
 
 pub struct UI<T, C>
 where
-    T: DrawTarget<C>,
+    T: DrawTarget<Color = C>,
     C: PixelColor + From<Color>,
 {
-    // LittlevGL is not thread-safe by default.
+    // LVGL is not thread-safe by default.
     _not_sync: PhantomData<*mut ()>,
     // Later we can add possibility to have multiple displays by using `heapless::Vec`
     display_data: Option<DisplayUserData<T, C>>,
 }
 
-// LittlevGL does not use thread locals.
+// LVGL does not use thread locals.
 unsafe impl<T, C> Send for UI<T, C>
 where
-    T: DrawTarget<C>,
+    T: DrawTarget<Color = C>,
     C: PixelColor + From<Color>,
 {
 }
 
 impl<T, C> UI<T, C>
 where
-    T: DrawTarget<C>,
+    T: DrawTarget<Color = C>,
     C: PixelColor + From<Color>,
 {
     pub fn init() -> LvResult<Self> {
-        if !LVGL_IN_USE.compare_and_swap(false, true, Ordering::SeqCst) {
-            unsafe {
-                lvgl_sys::lv_init();
-            }
+        if LVGL_IN_USE
+            .compare_exchange(false, true, Ordering::Relaxed, Ordering::Relaxed)
+            .is_ok()
+        {
+            crate::lvgl_init();
             Ok(Self {
                 _not_sync: PhantomData,
                 display_data: None,
@@ -72,15 +73,15 @@ where
             // Initialize the display buffer
             lvgl_sys::lv_disp_buf_init(
                 disp_buf.as_mut_ptr(),
-                Box::into_raw(Box::new(refresh_buffer1)?) as *mut cty::c_void,
-                Box::into_raw(Box::new(refresh_buffer2)?) as *mut cty::c_void,
+                Box::into_raw(Box::new(refresh_buffer1)) as *mut cty::c_void,
+                Box::into_raw(Box::new(refresh_buffer2)) as *mut cty::c_void,
                 lvgl_sys::LV_HOR_RES_MAX * REFRESH_BUFFER_LEN as u32,
             );
             // Basic initialization of the display driver
             lvgl_sys::lv_disp_drv_init(disp_drv.as_mut_ptr());
-            let mut disp_drv = Box::new(disp_drv.assume_init())?;
+            let mut disp_drv = Box::new(disp_drv.assume_init());
             // Assign the buffer to the display
-            disp_drv.buffer = Box::into_raw(Box::new(disp_buf.assume_init())?);
+            disp_drv.buffer = Box::into_raw(Box::new(disp_buf.assume_init()));
             // Set your driver function
             disp_drv.flush_cb = Some(display_callback_wrapper::<T, C>);
             disp_drv.user_data = &mut self.display_data as *mut _ as *mut cty::c_void;
@@ -134,7 +135,7 @@ where
 
 pub(crate) struct DisplayUserData<T, C>
 where
-    T: DrawTarget<C>,
+    T: DrawTarget<Color = C>,
     C: PixelColor + From<Color>,
 {
     display: T,
@@ -146,7 +147,7 @@ unsafe extern "C" fn display_callback_wrapper<T, C>(
     area: *const lvgl_sys::lv_area_t,
     color_p: *mut lvgl_sys::lv_color_t,
 ) where
-    T: DrawTarget<C>,
+    T: DrawTarget<Color = C>,
     C: PixelColor + From<Color>,
 {
     // In the `std` world we would make sure to capture panics here and make them not escape across
@@ -163,12 +164,12 @@ unsafe extern "C" fn display_callback_wrapper<T, C>(
         // TODO: Can we do anything when there is a error while flushing?
         let _ = display_flush(&mut user_data.display, (x1, x2), (y1, y2), color_p);
     }
-    // Indicate to LittlevGL that we are ready with the flushing
+    // Indicate to LVGL that we are ready with the flushing
     lvgl_sys::lv_disp_flush_ready(disp_drv);
 }
 
 // We separate this display flush function to reduce the amount of unsafe code we need to write.
-// This also provides a good separation of concerns, what is necessary from LittlevGL to work and
+// This also provides a good separation of concerns, what is necessary from LVGL to work and
 // what is the lvgl-rs wrapper responsibility.
 fn display_flush<T, C>(
     display: &mut T,
@@ -177,7 +178,7 @@ fn display_flush<T, C>(
     color_p: *mut lvgl_sys::lv_color_t,
 ) -> Result<(), T::Error>
 where
-    T: DrawTarget<C>,
+    T: DrawTarget<Color = C>,
     C: PixelColor + From<Color>,
 {
     let ys = y1..=y2;
@@ -186,17 +187,14 @@ where
 
     // We use iterators here to ensure that the Rust compiler can apply all possible
     // optimizations at compile time.
-    let pixels = ys
-        .enumerate()
-        .map(|(iy, y)| {
-            xs.clone().map(move |(ix, x)| {
-                let color_len = x_len * iy + ix;
-                let lv_color = unsafe { *color_p.add(color_len) };
-                let raw_color = Color::from_raw(lv_color);
-                drawable::Pixel(Point::new(x as i32, y as i32), raw_color.into())
-            })
+    let pixels = ys.enumerate().flat_map(|(iy, y)| {
+        xs.clone().map(move |(ix, x)| {
+            let color_len = x_len * iy + ix;
+            let lv_color = unsafe { *color_p.add(color_len) };
+            let raw_color = Color::from_raw(lv_color);
+            Pixel(Point::new(x as i32, y as i32), raw_color.into())
         })
-        .flatten();
+    });
 
-    Ok(display.draw_iter(pixels)?)
+    display.draw_iter(pixels)
 }