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/*
* Copyright 2009 ZXing authors
*
* Licensed under the Apache License, Version 2.0 (the "License");
* you may not use this file except in compliance with the License.
* You may obtain a copy of the License at
*
* http://www.apache.org/licenses/LICENSE-2.0
*
* Unless required by applicable law or agreed to in writing, software
* distributed under the License is distributed on an "AS IS" BASIS,
* WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
* See the License for the specific language governing permissions and
* limitations under the License.
*/
use std::rc::Rc;
use image::{DynamicImage, ImageBuffer, Luma};
use imageproc::geometric_transformations::rotate_about_center;
use crate::common::Result;
use crate::LuminanceSource;
// const MINUS_45_IN_RADIANS: f32 = -0.7853981633974483; // Math.toRadians(-45.0)
const MINUS_45_IN_RADIANS: f32 = std::f32::consts::FRAC_PI_4;
/**
* This LuminanceSource implementation is meant for J2SE clients and our blackbox unit tests.
*
* @author dswitkin@google.com (Daniel Switkin)
* @author Sean Owen
* @author code@elektrowolle.de (Wolfgang Jung)
*/
pub struct BufferedImageLuminanceSource {
// extends LuminanceSource {
image: Rc<DynamicImage>,
width: usize,
height: usize,
left: u32,
top: u32,
}
impl BufferedImageLuminanceSource {
pub fn new(image: DynamicImage) -> Self {
let w = image.width();
let h = image.height();
Self::with_details(image, 0, 0, w as usize, h as usize)
}
pub fn with_details(
image: DynamicImage,
left: u32,
top: u32,
width: usize,
height: usize,
) -> Self {
let img = image.to_rgba8();
let mut raster: ImageBuffer<_, Vec<_>> = ImageBuffer::new(image.width(), image.height());
for (x, y, new_pixel) in raster.enumerate_pixels_mut() {
let pixel = img.get_pixel(x, y);
let [red, green, blue, alpha] = pixel.0;
if alpha == 0 {
// white, so we know its luminance is 255
*new_pixel = Luma([0xFF])
} else {
// .299R + 0.587G + 0.114B (YUV/YIQ for PAL and NTSC),
// (306*R) >> 10 is approximately equal to R*0.299, and so on.
// 0x200 >> 10 is 0.5, it implements rounding.
*new_pixel = Luma([((306 * (red as u64)
+ 601 * (green as u64)
+ 117 * (blue as u64)
+ 0x200)
>> 10) as u8])
}
}
Self {
image: Rc::new(DynamicImage::from(raster)),
width,
height,
left,
top,
}
}
}
impl LuminanceSource for BufferedImageLuminanceSource {
fn get_row(&self, y: usize) -> Vec<u8> {
let width = self.get_width(); // - self.left as usize;
let pixels: Vec<u8> = || -> Option<Vec<u8>> {
Some(
self.image
.as_luma8()?
.rows()
.nth(y + self.top as usize)?
.skip(self.left as usize)
.take(width)
.map(|&p| p.0[0])
.collect(),
)
}()
.unwrap_or_default();
pixels
}
fn get_matrix(&self) -> Vec<u8> {
if self.height == self.image.height() as usize && self.width == self.image.width() as usize
{
return self.image.as_bytes().to_vec();
}
let skip = self.top * self.image.width();
let row_skip = self.left;
let total_row_take = self.width;
let total_rows_to_take = self.image.width() * self.height as u32;
let unmanaged = self
.image
.as_bytes()
.iter()
.skip(skip as usize) // get to the row we want
.take(total_rows_to_take as usize)
.collect::<Vec<&u8>>(); // get all the rows we want to look at
let data = unmanaged
.chunks_exact(self.image.width() as usize) // Get rows
.flat_map(|f| {
f.iter()
.skip(row_skip as usize)
.take(total_row_take)
.copied()
}) // flatten this all out
.copied() // copy it over so that it's u8
.collect(); // collect into a vec
data
}
fn get_width(&self) -> usize {
self.width
}
fn get_height(&self) -> usize {
self.height
}
fn is_crop_supported(&self) -> bool {
true
}
fn crop(&self, left: usize, top: usize, width: usize, height: usize) -> Result<Self> {
Ok(Self {
image: self.image.clone(),
width,
height,
left: self.left + left as u32,
top: self.top + top as u32,
})
}
fn is_rotate_supported(&self) -> bool {
true
}
fn invert(&mut self) {
let mut img = (*self.image).clone();
img.invert();
self.image = Rc::new(img);
}
fn rotate_counter_clockwise(&self) -> Result<Self> {
let img = self.image.rotate270();
Ok(Self {
width: img.width() as usize,
height: img.height() as usize,
image: Rc::new(img),
left: 0,
top: 0,
})
}
fn rotate_counter_clockwise_45(&self) -> Result<Self> {
let img = rotate_about_center(
&self.image.to_luma8(),
MINUS_45_IN_RADIANS,
imageproc::geometric_transformations::Interpolation::Nearest,
Luma([u8::MAX / 2; 1]),
);
let new_img = DynamicImage::from(img);
Ok(Self {
width: new_img.width() as usize,
height: new_img.height() as usize,
image: Rc::new(new_img),
left: 0,
top: 0,
})
}
}