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#![cfg_attr(not(test), no_std)]
#![allow(clippy::unusual_byte_groupings)]
extern crate alloc;
use alloc::vec::Vec;
use core::ops::Index;
mod bits;
mod canvas;
mod cast;
mod ec;
mod optimize;
mod render;
mod types;
use crate::cast::As;
use crate::render::{Pixel, Renderer};
pub use crate::types::EcLevel;
use crate::types::{Color, QrResult, Version};
/// The encoded QR code symbol.
#[derive(Clone)]
pub struct QrCode {
content: Vec<Color>,
version: Version,
width: usize,
}
impl QrCode {
/// Constructs a new QR code which automatically encodes the given data.
///
/// This method uses the "medium" error correction level and automatically
/// chooses the smallest QR code.
///
/// ```
/// use tinyqr::QrCode;
///
/// let code = QrCode::new(b"Some data").unwrap();
/// ```
///
/// # Errors
///
/// Returns error if the QR code cannot be constructed, e.g. when the data
/// is too long.
pub fn new<D: AsRef<[u8]>>(data: D) -> QrResult<Self> {
Self::with_error_correction_level(data, EcLevel::M)
}
/// Constructs a new QR code which automatically encodes the given data at a
/// specific error correction level.
///
/// This method automatically chooses the smallest QR code.
///
/// # Errors
///
/// Returns error if the QR code cannot be constructed, e.g. when the data
/// is too long.
pub fn with_error_correction_level<D: AsRef<[u8]>>(data: D, ec_level: EcLevel) -> QrResult<Self> {
let bits = bits::encode_auto(data.as_ref(), ec_level)?;
Self::with_bits(bits, ec_level)
}
/// Constructs a new QR code with encoded bits.
///
/// Use this method only if there are very special need to manipulate the
/// raw bits before encoding. Some examples are:
///
/// * Encode data using specific character set with ECI
/// * Use the FNC1 modes
/// * Avoid the optimal segmentation algorithm
///
/// See the `Bits` structure for detail.
///
/// # Errors
///
/// Returns error if the QR code cannot be constructed, e.g. when the bits
/// are too long, or when the version and error correction level are
/// incompatible.
fn with_bits(bits: bits::Bits, ec_level: EcLevel) -> QrResult<Self> {
let version = bits.version();
let data = bits.into_bytes();
let (encoded_data, ec_data) = ec::construct_codewords(&data, version, ec_level)?;
let mut canvas = canvas::Canvas::new(version, ec_level);
canvas.draw_all_functional_patterns();
canvas.draw_data(&encoded_data, &ec_data);
let canvas = canvas.apply_best_mask();
Ok(Self { content: canvas.into_colors(), version, width: version.width().as_usize() })
}
/// Renders the QR code into an image. The result is an image builder, which
/// you may do some additional configuration before copying it into a
/// concrete image.
pub fn render<P: Pixel>(&self) -> Renderer<'_, P> {
let quiet_zone = if self.version.is_micro() { 2 } else { 4 };
Renderer::new(&self.content, self.width, quiet_zone)
}
}
impl Index<(usize, usize)> for QrCode {
type Output = Color;
fn index(&self, (x, y): (usize, usize)) -> &Color {
let index = y * self.width + x;
&self.content[index]
}
}