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#![cfg(feature="image")]
use image::{Pixel, Rgb, Rgba, Luma, LumaA, Primitive, ImageBuffer};
pub trait BlankAndWhitePixel: Pixel {
fn black_color() -> Self;
fn white_color() -> Self;
}
impl<S: Primitive + 'static> BlankAndWhitePixel for Rgb<S> {
fn black_color() -> Self {
Rgb { data: [S::zero(); 3] }
}
fn white_color() -> Self {
Rgb { data: [S::max_value(); 3] }
}
}
impl<S: Primitive + 'static> BlankAndWhitePixel for Rgba<S> {
fn black_color() -> Self {
Rgba { data: [S::zero(), S::zero(), S::zero(), S::max_value()] }
}
fn white_color() -> Self {
Rgba { data: [S::max_value(); 4] }
}
}
impl<S: Primitive + 'static> BlankAndWhitePixel for Luma<S> {
fn black_color() -> Self {
Luma { data: [S::zero()] }
}
fn white_color() -> Self {
Luma { data: [S::max_value()] }
}
}
impl<S: Primitive + 'static> BlankAndWhitePixel for LumaA<S> {
fn black_color() -> Self {
LumaA { data: [S::zero(), S::max_value()] }
}
fn white_color() -> Self {
LumaA { data: [S::max_value(); 2] }
}
}
pub struct Renderer<'a, P: BlankAndWhitePixel> {
content: &'a [bool],
modules_count: u32,
quiet_zone: u32,
module_size: u32,
dark_color: P,
light_color: P,
has_quiet_zone: bool,
}
impl<'a, P: BlankAndWhitePixel + 'static> Renderer<'a, P> {
pub fn new(content: &'a [bool], modules_count: usize, quiet_zone: u32) -> Renderer<'a, P> {
assert!(modules_count * modules_count == content.len());
Renderer {
content: content,
modules_count: modules_count as u32,
quiet_zone: quiet_zone,
module_size: 8,
dark_color: P::black_color(),
light_color: P::white_color(),
has_quiet_zone: true,
}
}
pub fn dark_color(&mut self, color: P) -> &mut Self {
self.dark_color = color;
self
}
pub fn light_color(&mut self, color: P) -> &mut Self {
self.light_color = color;
self
}
pub fn quiet_zone(&mut self, has_quiet_zone: bool) -> &mut Self {
self.has_quiet_zone = has_quiet_zone;
self
}
pub fn module_size(&mut self, size: u32) -> &mut Self {
self.module_size = size;
self
}
pub fn min_width(&mut self, width: u32) -> &mut Self {
let quiet_zone = if self.has_quiet_zone { 2 } else { 0 } * self.quiet_zone;
let width_in_modules = self.modules_count + quiet_zone;
let module_size = (width + width_in_modules - 1) / width_in_modules;
self.module_size(module_size)
}
pub fn to_image(&self) -> ImageBuffer<P, Vec<P::Subpixel>> {
let w = self.modules_count;
let qz = if self.has_quiet_zone { self.quiet_zone } else { 0 };
let width = w + 2 * qz;
let ms = self.module_size;
let real_width = width * ms;
let mut image = ImageBuffer::new(real_width, real_width);
let mut i = 0;
for y in 0 .. width {
for x in 0 .. width {
let color = if qz <= x && x < w + qz && qz <= y && y < w + qz {
let c = if self.content[i] { self.dark_color } else { self.light_color };
i += 1;
c
} else {
self.light_color
};
for yy in y * ms .. (y + 1) * ms {
for xx in x * ms .. (x + 1) * ms {
image.put_pixel(xx, yy, color);
}
}
}
}
image
}
}
#[cfg(test)]
mod render_tests {
use render::Renderer;
use image::{Luma, Rgba};
#[test]
fn test_render_luma8_unsized() {
let image = Renderer::<Luma<u8>>::new(&[
false, true, true,
true, false, false,
false, true, false,
], 3, 1).module_size(1).to_image();
let expected = [
255, 255, 255, 255, 255,
255, 255, 0, 0, 255,
255, 0, 255, 255, 255,
255, 255, 0, 255, 255,
255, 255, 255, 255, 255,
];
assert_eq!(image.into_raw(), expected);
}
#[test]
fn test_render_rgba_unsized() {
let image = Renderer::<Rgba<u8>>::new(&[
false, true,
true, true,
], 2, 1).module_size(1).to_image();
let expected: &[u8] = &[
255,255,255,255, 255,255,255,255, 255,255,255,255, 255,255,255,255,
255,255,255,255, 255,255,255,255, 0, 0, 0,255, 255,255,255,255,
255,255,255,255, 0, 0, 0,255, 0, 0, 0,255, 255,255,255,255,
255,255,255,255, 255,255,255,255, 255,255,255,255, 255,255,255,255,
];
assert_eq!(image.into_raw(), expected);
}
#[test]
fn test_render_resized() {
let image = Renderer::<Luma<u8>>::new(&[
true, false,
false, true,
], 2, 1).min_width(10).to_image();
let expected: &[u8] = &[
255,255,255, 255,255,255, 255,255,255, 255,255,255,
255,255,255, 255,255,255, 255,255,255, 255,255,255,
255,255,255, 255,255,255, 255,255,255, 255,255,255,
255,255,255, 0, 0, 0, 255,255,255, 255,255,255,
255,255,255, 0, 0, 0, 255,255,255, 255,255,255,
255,255,255, 0, 0, 0, 255,255,255, 255,255,255,
255,255,255, 255,255,255, 0, 0, 0, 255,255,255,
255,255,255, 255,255,255, 0, 0, 0, 255,255,255,
255,255,255, 255,255,255, 0, 0, 0, 255,255,255,
255,255,255, 255,255,255, 255,255,255, 255,255,255,
255,255,255, 255,255,255, 255,255,255, 255,255,255,
255,255,255, 255,255,255, 255,255,255, 255,255,255,
];
assert_eq!(image.dimensions(), (12, 12));
assert_eq!(image.into_raw(), expected);
}
}