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expose CharGrid to C API

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This commit is contained in:
Vinzenz Schroeter 2025-01-12 13:07:24 +01:00
parent 4f83aa3d5c
commit 2f2160f246
9 changed files with 676 additions and 22 deletions
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10
crates/servicepoint/src/bit_vec.rs Normal file
View file

@ -0,0 +1,10 @@
/// A byte-packed vector of booleans.
///
/// The implementation is provided by [bitvec].
/// This is an alias for the specific type of [bitvec::BitVec] used in this crate.
pub type BitVec = bitvec::BitVec<u8, bitvec::Msb0>;
pub mod bitvec {
//! Re-export of the used library [mod@bitvec].
pub use bitvec::prelude::*;
}

53
crates/servicepoint/src/bitmap.rs
View file

@ -5,7 +5,18 @@ use ::bitvec::order::Msb0;
use ::bitvec::prelude::BitSlice;
use ::bitvec::slice::IterMut;
/// A grid of pixels stored in packed bytes.
/// A fixed-size 2D grid of booleans.
///
/// The values are stored in packed bytes (8 values per byte) in the same order as used by the display for storing pixels.
/// This means that no conversion is necessary for sending the data to the display.
///
/// # Examples
///
/// ```rust
/// use servicepoint::Bitmap;
/// let mut bitmap = Bitmap::new(4, 2);
///
/// ```
#[derive(Debug, Clone, PartialEq, Eq)]
pub struct Bitmap {
width: usize,
@ -27,7 +38,11 @@ impl Bitmap {
///
/// - when the width is not dividable by 8
pub fn new(width: usize, height: usize) -> Self {
assert_eq!(width % 8, 0);
assert_eq!(
width % 8,
0,
"width must be a multiple of 8, but is {width}"
);
Self {
width,
height,
@ -182,6 +197,26 @@ impl From<Bitmap> for BitVec {
}
}
impl From<&ValueGrid<bool>> for Bitmap {
fn from(value: &ValueGrid<bool>) -> Self {
let mut result = Self::new(value.width(), value.height());
for (mut to, from) in result.iter_mut().zip(value.iter()) {
*to = *from;
}
result
}
}
impl From<&Bitmap> for ValueGrid<bool> {
fn from(value: &Bitmap) -> Self {
let mut result = Self::new(value.width(), value.height());
for (to, from) in result.iter_mut().zip(value.iter()) {
*to = *from;
}
result
}
}
pub struct IterRows<'t> {
bitmap: &'t Bitmap,
row: usize,
@ -204,7 +239,7 @@ impl<'t> Iterator for IterRows<'t> {
#[cfg(test)]
mod tests {
use crate::{BitVec, Bitmap, DataRef, Grid};
use crate::{BitVec, Bitmap, DataRef, Grid, ValueGrid};
#[test]
fn fill() {
@ -304,4 +339,16 @@ mod tests {
let bitvec: BitVec = grid.into();
assert_eq!(bitvec.as_raw_slice(), [0x80, 0x00]);
}
#[test]
fn from_bool_grid() {
let original = ValueGrid::load(
8,
1,
&[true, false, true, false, true, false, true, false],
);
let converted = Bitmap::from(&original);
let reconverted = ValueGrid::from(&converted);
assert_eq!(original, reconverted);
}
}

4
crates/servicepoint/src/bitvec.rs
View file

@ -1,4 +0,0 @@
pub use bitvec::prelude::*;
/// An alias for the specific type of [bitvec::prelude::BitVec] used.
pub type BitVec = bitvec::prelude::BitVec<u8, Msb0>;

6
crates/servicepoint/src/byte_grid.rs
View file

@ -1,2 +1,4 @@
/// A 2d grid of bytes - see [crate::ValueGrid].
pub type ByteGrid = crate::value_grid::ValueGrid<u8>;
use crate::ValueGrid;
/// A 2d grid of bytes - see [ValueGrid].
pub type ByteGrid = ValueGrid<u8>;

32
crates/servicepoint/src/lib.rs
View file

@ -2,14 +2,17 @@
//!
//! Your starting point is a [Connection] to the display.
//! With a connection, you can send [Command]s.
//! When received, the display will update the state of the pixels.
//! When received, the display will update the state of its pixels.
//!
//! # Examples
//!
//! ```rust
//! use servicepoint::{Command, CompressionCode, Grid, Bitmap};
//! ### Clear display
//!
//! let connection = servicepoint::Connection::open("127.0.0.1:2342")
//! ```rust
//! use servicepoint::{Connection, Command};
//!
//! // establish a connection
//! let connection = Connection::open("127.0.0.1:2342")
//! .expect("connection failed");
//!
//! // turn off all pixels on display
@ -17,6 +20,8 @@
//! .expect("send failed");
//! ```
//!
//! ### Set all pixels to on
//!
//! ```rust
//! # use servicepoint::{Command, CompressionCode, Grid, Bitmap};
//! # let connection = servicepoint::Connection::open("127.0.0.1:2342").expect("connection failed");
@ -34,9 +39,24 @@
//! // send command to display
//! connection.send(command).expect("send failed");
//! ```
//!
//! ### Send text
//!
//! ```rust
//! # use servicepoint::{Command, CompressionCode, Grid, Bitmap, CharGrid};
//! # let connection = servicepoint::Connection::open("127.0.0.1:2342").expect("connection failed");
//! // create a text grid
//! let mut grid = CharGrid::from("Hello\nCCCB?");
//! // modify the grid
//! grid.set(grid.width() - 1, 1, '!');
//! // create the command to send the data
//! let command = Command::Utf8Data(servicepoint::Origin::ZERO, grid);
//! // send command to display
//! connection.send(command).expect("send failed");
//! ```
pub use crate::bit_vec::{bitvec, BitVec};
pub use crate::bitmap::Bitmap;
pub use crate::bitvec::BitVec;
pub use crate::brightness::Brightness;
pub use crate::brightness_grid::BrightnessGrid;
pub use crate::byte_grid::ByteGrid;
@ -55,8 +75,8 @@ pub use crate::value_grid::{
IterGridRows, SetValueSeriesError, TryLoadValueGridError, Value, ValueGrid,
};
mod bit_vec;
mod bitmap;
mod bitvec;
mod brightness;
mod brightness_grid;
mod byte_grid;

289
crates/servicepoint_binding_c/examples/lang_c/include/servicepoint.h
View file

@ -14,12 +14,12 @@
#define SP_BRIGHTNESS_LEVELS 12
/**
* see [Brightness::MAX]
* see [servicepoint::Brightness::MAX]
*/
#define SP_BRIGHTNESS_MAX 11
/**
* see [Brightness::MIN]
* see [servicepoint::Brightness::MIN]
*/
#define SP_BRIGHTNESS_MIN 0
@ -131,6 +131,25 @@ typedef struct SPBitmap SPBitmap;
*/
typedef struct SPBrightnessGrid SPBrightnessGrid;
/**
* A C-wrapper for grid containing UTF-8 characters.
*
* As the rust [char] type is not FFI-safe, characters are passed in their UTF-32 form as 32bit unsigned integers.
*
* The encoding is enforced in most cases by the rust standard library
* and will panic when provided with illegal characters.
*
* # Examples
*
* ```C
* CharGrid grid = sp_char_grid_new(4, 3);
* sp_char_grid_fill(grid, '?');
* sp_char_grid_set(grid, 0, 0, '!');
* sp_char_grid_free(grid);
* ```
*/
typedef struct SPCharGrid SPCharGrid;
/**
* A low-level display command.
*
@ -367,6 +386,20 @@ SPBitmap *sp_bitmap_load(size_t width,
SPBitmap *sp_bitmap_new(size_t width,
size_t height);
/**
* Creates a new [SPBitmap] with a size matching the screen.
*
* returns: [SPBitmap] initialized to all pixels off. Will never return NULL.
*
* # Safety
*
* The caller has to make sure that:
*
* - the returned instance is freed in some way, either by using a consuming function or
* by explicitly calling [sp_bitmap_free].
*/
SPBitmap *sp_bitmap_new_screen_sized(void);
/**
* Sets the value of the specified position in the [SPBitmap].
*
@ -865,6 +898,196 @@ SPByteSlice sp_brightness_grid_unsafe_data_ref(SPBrightnessGrid *brightness_grid
*/
size_t sp_brightness_grid_width(const SPBrightnessGrid *brightness_grid);
/**
* Clones a [SPCharGrid].
*
* Will never return NULL.
*
* # Panics
*
* - when `char_grid` is NULL
*
* # Safety
*
* The caller has to make sure that:
*
* - `char_grid` points to a valid [SPCharGrid]
* - `char_grid` is not written to concurrently
* - the returned instance is freed in some way, either by using a consuming function or
* by explicitly calling `sp_char_grid_free`.
*/
SPCharGrid *sp_char_grid_clone(const SPCharGrid *char_grid);
/**
* Sets the value of all cells in the [SPCharGrid].
*
* # Arguments
*
* - `char_grid`: instance to write to
* - `value`: the value to set all cells to
*
* # Panics
*
* - when `char_grid` is NULL
*
* # Safety
*
* The caller has to make sure that:
*
* - `char_grid` points to a valid [SPCharGrid]
* - `char_grid` is not written to or read from concurrently
*/
void sp_char_grid_fill(SPCharGrid *char_grid, uint32_t value);
/**
* Deallocates a [SPCharGrid].
*
* # Panics
*
* - when `char_grid` is NULL
*
* # Safety
*
* The caller has to make sure that:
*
* - `char_grid` points to a valid [SPCharGrid]
* - `char_grid` is not used concurrently or after char_grid call
* - `char_grid` was not passed to another consuming function, e.g. to create a [SPCommand]
*
* [SPCommand]: [crate::SPCommand]
*/
void sp_char_grid_free(SPCharGrid *char_grid);
/**
* Gets the current value at the specified position.
*
* # Arguments
*
* - `char_grid`: instance to read from
* - `x` and `y`: position of the cell to read
*
* # Panics
*
* - when `char_grid` is NULL
* - when accessing `x` or `y` out of bounds
*
* # Safety
*
* The caller has to make sure that:
*
* - `char_grid` points to a valid [SPCharGrid]
* - `char_grid` is not written to concurrently
*/
uint32_t sp_char_grid_get(const SPCharGrid *char_grid, size_t x, size_t y);
/**
* Gets the height of the [SPCharGrid] instance.
*
* # Arguments
*
* - `char_grid`: instance to read from
*
* # Panics
*
* - when `char_grid` is NULL
*
* # Safety
*
* The caller has to make sure that:
*
* - `char_grid` points to a valid [SPCharGrid]
*/
size_t sp_char_grid_height(const SPCharGrid *char_grid);
/**
* Loads a [SPCharGrid] with the specified dimensions from the provided data.
*
* Will never return NULL.
*
* # Panics
*
* - when `data` is NULL
* - when the provided `data_length` does not match `height` and `width`
* - when `data` is not valid UTF-8
*
* # Safety
*
* The caller has to make sure that:
*
* - `data` points to a valid memory location of at least `data_length`
* bytes in size.
* - the returned instance is freed in some way, either by using a consuming function or
* by explicitly calling `sp_char_grid_free`.
*/
SPCharGrid *sp_char_grid_load(size_t width,
size_t height,
const uint8_t *data,
size_t data_length);
/**
* Creates a new [SPCharGrid] with the specified dimensions.
*
* returns: [SPCharGrid] initialized to 0. Will never return NULL.
*
* # Safety
*
* The caller has to make sure that:
*
* - the returned instance is freed in some way, either by using a consuming function or
* by explicitly calling `sp_char_grid_free`.
*/
SPCharGrid *sp_char_grid_new(size_t width,
size_t height);
/**
* Sets the value of the specified position in the [SPCharGrid].
*
* # Arguments
*
* - `char_grid`: instance to write to
* - `x` and `y`: position of the cell
* - `value`: the value to write to the cell
*
* returns: old value of the cell
*
* # Panics
*
* - when `char_grid` is NULL
* - when accessing `x` or `y` out of bounds
*
* # Safety
*
* The caller has to make sure that:
*
* - `char_grid` points to a valid [SPBitVec]
* - `char_grid` is not written to or read from concurrently
*
* [SPBitVec]: [crate::SPBitVec]
*/
void sp_char_grid_set(SPCharGrid *char_grid,
size_t x,
size_t y,
uint32_t value);
/**
* Gets the width of the [SPCharGrid] instance.
*
* # Arguments
*
* - `char_grid`: instance to read from
*
* # Panics
*
* - when `char_grid` is NULL
*
* # Safety
*
* The caller has to make sure that:
*
* - `char_grid` points to a valid [SPCharGrid]
*/
size_t sp_char_grid_width(const SPCharGrid *char_grid);
/**
* Set pixel data starting at the pixel offset on screen.
*
@ -1101,7 +1324,7 @@ SPCommand *sp_command_clear(void);
SPCommand *sp_command_clone(const SPCommand *command);
/**
* Show text on the screen.
* Show codepage 437 encoded text on the screen.
*
* The passed [SPCp437Grid] gets consumed.
*
@ -1201,6 +1424,30 @@ SPCommand *sp_command_hard_reset(void);
*/
SPCommand *sp_command_try_from_packet(SPPacket *packet);
/**
* Show UTF-8 encoded text on the screen.
*
* The passed [SPCharGrid] gets consumed.
*
* Returns: a new [servicepoint::Command::Utf8Data] instance. Will never return NULL.
*
* # Panics
*
* - when `grid` is null
*
* # Safety
*
* The caller has to make sure that:
*
* - `grid` points to a valid instance of [SPCharGrid]
* - `grid` is not used concurrently or after this call
* - the returned [SPCommand] instance is freed in some way, either by using a consuming function or
* by explicitly calling `sp_command_free`.
*/
SPCommand *sp_command_utf8_data(size_t x,
size_t y,
SPCharGrid *grid);
/**
* Creates a new instance of [SPConnection] for testing that does not actually send anything.
*
@ -1528,7 +1775,7 @@ SPPacket *sp_packet_clone(const SPPacket *packet);
*
* # Panics
*
* - when `sp_packet_free` is NULL
* - when `packet` is NULL
*
* # Safety
*
@ -1560,6 +1807,40 @@ void sp_packet_free(SPPacket *packet);
*/
SPPacket *sp_packet_from_command(SPCommand *command);
/**
* Creates a raw [SPPacket] from parts.
*
* # Arguments
*
* - `command_code` specifies which command this packet contains
* - `a`, `b`, `c` and `d` are command-specific header values
* - `payload` is the optional data that is part of the command
* - `payload_len` is the size of the payload
*
* returns: new instance. Will never return null.
*
* # Panics
*
* - when `payload` is null, but `payload_len` is not zero
* - when `payload_len` is zero, but `payload` is nonnull
*
* # Safety
*
* The caller has to make sure that:
*
* - `payload` points to a valid memory region of at least `payload_len` bytes
* - `payload` is not written to concurrently
* - the returned [SPPacket] instance is freed in some way, either by using a consuming function or
* by explicitly calling [sp_packet_free].
*/
SPPacket *sp_packet_from_parts(uint16_t command_code,
uint16_t a,
uint16_t b,
uint16_t c,
uint16_t d,
const uint8_t *payload,
size_t payload_len);
/**
* Tries to load a [SPPacket] from the passed array with the specified length.
*

263
crates/servicepoint_binding_c/src/char_grid.rs Normal file
View file

@ -0,0 +1,263 @@
//! C functions for interacting with [SPCharGrid]s
//!
//! prefix `sp_char_grid_`
use servicepoint::Grid;
use std::ptr::NonNull;
/// A C-wrapper for grid containing UTF-8 characters.
///
/// As the rust [char] type is not FFI-safe, characters are passed in their UTF-32 form as 32bit unsigned integers.
///
/// The encoding is enforced in most cases by the rust standard library
/// and will panic when provided with illegal characters.
///
/// # Examples
///
/// ```C
/// CharGrid grid = sp_char_grid_new(4, 3);
/// sp_char_grid_fill(grid, '?');
/// sp_char_grid_set(grid, 0, 0, '!');
/// sp_char_grid_free(grid);
/// ```
pub struct SPCharGrid(pub(crate) servicepoint::CharGrid);
impl Clone for SPCharGrid {
fn clone(&self) -> Self {
SPCharGrid(self.0.clone())
}
}
/// Creates a new [SPCharGrid] with the specified dimensions.
///
/// returns: [SPCharGrid] initialized to 0. Will never return NULL.
///
/// # Safety
///
/// The caller has to make sure that:
///
/// - the returned instance is freed in some way, either by using a consuming function or
/// by explicitly calling `sp_char_grid_free`.
#[no_mangle]
pub unsafe extern "C" fn sp_char_grid_new(
width: usize,
height: usize,
) -> NonNull<SPCharGrid> {
let result =
Box::new(SPCharGrid(servicepoint::CharGrid::new(width, height)));
NonNull::from(Box::leak(result))
}
/// Loads a [SPCharGrid] with the specified dimensions from the provided data.
///
/// Will never return NULL.
///
/// # Panics
///
/// - when `data` is NULL
/// - when the provided `data_length` does not match `height` and `width`
/// - when `data` is not valid UTF-8
///
/// # Safety
///
/// The caller has to make sure that:
///
/// - `data` points to a valid memory location of at least `data_length`
/// bytes in size.
/// - the returned instance is freed in some way, either by using a consuming function or
/// by explicitly calling `sp_char_grid_free`.
#[no_mangle]
pub unsafe extern "C" fn sp_char_grid_load(
width: usize,
height: usize,
data: *const u8,
data_length: usize,
) -> NonNull<SPCharGrid> {
assert!(data.is_null());
let data = std::slice::from_raw_parts(data, data_length);
let result = Box::new(SPCharGrid(
servicepoint::CharGrid::load_utf8(width, height, data.to_vec())
.unwrap(),
));
NonNull::from(Box::leak(result))
}
/// Clones a [SPCharGrid].
///
/// Will never return NULL.
///
/// # Panics
///
/// - when `char_grid` is NULL
///
/// # Safety
///
/// The caller has to make sure that:
///
/// - `char_grid` points to a valid [SPCharGrid]
/// - `char_grid` is not written to concurrently
/// - the returned instance is freed in some way, either by using a consuming function or
/// by explicitly calling `sp_char_grid_free`.
#[no_mangle]
pub unsafe extern "C" fn sp_char_grid_clone(
char_grid: *const SPCharGrid,
) -> NonNull<SPCharGrid> {
assert!(!char_grid.is_null());
let result = Box::new((*char_grid).clone());
NonNull::from(Box::leak(result))
}
/// Deallocates a [SPCharGrid].
///
/// # Panics
///
/// - when `char_grid` is NULL
///
/// # Safety
///
/// The caller has to make sure that:
///
/// - `char_grid` points to a valid [SPCharGrid]
/// - `char_grid` is not used concurrently or after char_grid call
/// - `char_grid` was not passed to another consuming function, e.g. to create a [SPCommand]
///
/// [SPCommand]: [crate::SPCommand]
#[no_mangle]
pub unsafe extern "C" fn sp_char_grid_free(char_grid: *mut SPCharGrid) {
assert!(!char_grid.is_null());
_ = Box::from_raw(char_grid);
}
/// Gets the current value at the specified position.
///
/// # Arguments
///
/// - `char_grid`: instance to read from
/// - `x` and `y`: position of the cell to read
///
/// # Panics
///
/// - when `char_grid` is NULL
/// - when accessing `x` or `y` out of bounds
///
/// # Safety
///
/// The caller has to make sure that:
///
/// - `char_grid` points to a valid [SPCharGrid]
/// - `char_grid` is not written to concurrently
#[no_mangle]
pub unsafe extern "C" fn sp_char_grid_get(
char_grid: *const SPCharGrid,
x: usize,
y: usize,
) -> u32 {
assert!(!char_grid.is_null());
(*char_grid).0.get(x, y) as u32
}
/// Sets the value of the specified position in the [SPCharGrid].
///
/// # Arguments
///
/// - `char_grid`: instance to write to
/// - `x` and `y`: position of the cell
/// - `value`: the value to write to the cell
///
/// returns: old value of the cell
///
/// # Panics
///
/// - when `char_grid` is NULL
/// - when accessing `x` or `y` out of bounds
///
/// # Safety
///
/// The caller has to make sure that:
///
/// - `char_grid` points to a valid [SPBitVec]
/// - `char_grid` is not written to or read from concurrently
///
/// [SPBitVec]: [crate::SPBitVec]
#[no_mangle]
pub unsafe extern "C" fn sp_char_grid_set(
char_grid: *mut SPCharGrid,
x: usize,
y: usize,
value: u32,
) {
assert!(!char_grid.is_null());
(*char_grid).0.set(x, y, char::from_u32(value).unwrap());
}
/// Sets the value of all cells in the [SPCharGrid].
///
/// # Arguments
///
/// - `char_grid`: instance to write to
/// - `value`: the value to set all cells to
///
/// # Panics
///
/// - when `char_grid` is NULL
///
/// # Safety
///
/// The caller has to make sure that:
///
/// - `char_grid` points to a valid [SPCharGrid]
/// - `char_grid` is not written to or read from concurrently
#[no_mangle]
pub unsafe extern "C" fn sp_char_grid_fill(
char_grid: *mut SPCharGrid,
value: u32,
) {
assert!(!char_grid.is_null());
(*char_grid).0.fill(char::from_u32(value).unwrap());
}
/// Gets the width of the [SPCharGrid] instance.
///
/// # Arguments
///
/// - `char_grid`: instance to read from
///
/// # Panics
///
/// - when `char_grid` is NULL
///
/// # Safety
///
/// The caller has to make sure that:
///
/// - `char_grid` points to a valid [SPCharGrid]
#[no_mangle]
pub unsafe extern "C" fn sp_char_grid_width(
char_grid: *const SPCharGrid,
) -> usize {
assert!(!char_grid.is_null());
(*char_grid).0.width()
}
/// Gets the height of the [SPCharGrid] instance.
///
/// # Arguments
///
/// - `char_grid`: instance to read from
///
/// # Panics
///
/// - when `char_grid` is NULL
///
/// # Safety
///
/// The caller has to make sure that:
///
/// - `char_grid` points to a valid [SPCharGrid]
#[no_mangle]
pub unsafe extern "C" fn sp_char_grid_height(
char_grid: *const SPCharGrid,
) -> usize {
assert!(!char_grid.is_null());
(*char_grid).0.height()
}

39
crates/servicepoint_binding_c/src/command.rs
View file

@ -5,8 +5,8 @@
use std::ptr::{null_mut, NonNull};
use crate::{
SPBitVec, SPBitmap, SPBrightnessGrid, SPCompressionCode, SPCp437Grid,
SPPacket,
SPBitVec, SPBitmap, SPBrightnessGrid, SPCharGrid, SPCompressionCode,
SPCp437Grid, SPPacket,
};
/// A low-level display command.
@ -366,7 +366,7 @@ pub unsafe extern "C" fn sp_command_bitmap_linear_xor(
NonNull::from(Box::leak(result))
}
/// Show text on the screen.
/// Show codepage 437 encoded text on the screen.
///
/// The passed [SPCp437Grid] gets consumed.
///
@ -399,6 +399,39 @@ pub unsafe extern "C" fn sp_command_cp437_data(
NonNull::from(Box::leak(result))
}
/// Show UTF-8 encoded text on the screen.
///
/// The passed [SPCharGrid] gets consumed.
///
/// Returns: a new [servicepoint::Command::Utf8Data] instance. Will never return NULL.
///
/// # Panics
///
/// - when `grid` is null
///
/// # Safety
///
/// The caller has to make sure that:
///
/// - `grid` points to a valid instance of [SPCharGrid]
/// - `grid` is not used concurrently or after this call
/// - the returned [SPCommand] instance is freed in some way, either by using a consuming function or
/// by explicitly calling `sp_command_free`.
#[no_mangle]
pub unsafe extern "C" fn sp_command_utf8_data(
x: usize,
y: usize,
grid: *mut SPCharGrid,
) -> NonNull<SPCommand> {
assert!(!grid.is_null());
let grid = *Box::from_raw(grid);
let result = Box::new(SPCommand(servicepoint::Command::Utf8Data(
servicepoint::Origin::new(x, y),
grid.0,
)));
NonNull::from(Box::leak(result))
}
/// Sets a window of pixels to the specified values.
///
/// The passed [SPBitmap] gets consumed.

2
crates/servicepoint_binding_c/src/lib.rs
View file

@ -29,6 +29,7 @@ pub use crate::bitmap::*;
pub use crate::bitvec::*;
pub use crate::brightness_grid::*;
pub use crate::byte_slice::*;
pub use crate::char_grid::*;
pub use crate::command::*;
pub use crate::connection::*;
pub use crate::constants::*;
@ -39,6 +40,7 @@ mod bitmap;
mod bitvec;
mod brightness_grid;
mod byte_slice;
mod char_grid;
mod command;
mod connection;
mod constants;