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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::borrow::Cow;
use image::{DynamicImage, GenericImageView, ImageBuffer, Luma, Pixel};
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: DynamicImage,
width: usize,
height: usize,
}
impl BufferedImageLuminanceSource {
pub fn new(image: DynamicImage) -> Self {
let width = image.width() as usize;
let height = image.height() as usize;
// Self::with_details(image, 0, 0, w as usize, h as usize)
Self {
image: build_local_grey_image(image),
width,
height,
}
}
}
impl LuminanceSource for BufferedImageLuminanceSource {
const SUPPORTS_CROP: bool = true;
const SUPPORTS_ROTATION: bool = true;
fn get_row(&'_ self, y: usize) -> Option<Cow<'_, [u8]>> {
let buf = self.image.as_luma8()?;
let width = self.get_width();
let stride = buf.width() as usize; // full row length in pixels
let start = y
.checked_mul(stride) // guard against overflow
.and_then(|off| off.checked_add(0))
.unwrap_or(0);
// Make sure we don’t go past the end
if start + width > buf.as_raw().len() {
return None;
}
// Copy the exact sub-slice in one memcpy
Some(Cow::Borrowed(&buf.as_raw()[start..start + width]))
}
fn get_column(&self, x: usize) -> Vec<u8> {
let pixels: Vec<u8> = || -> Option<Vec<u8>> {
Some(self.image.as_luma8()?.rows().fold(
Vec::with_capacity(self.get_height()),
|mut acc, e| {
let pix = e.into_iter().nth(x).unwrap_or(&Luma([0_u8]));
acc.push(pix.0[0]);
acc
},
))
}()
.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
// {
self.image.as_bytes().to_vec()
// }
// let skip = self.image.width();
// let row_skip = 0;
// 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 crop(&self, left: usize, top: usize, width: usize, height: usize) -> Result<Self> {
Ok(Self {
image: self
.image
.crop_imm(left as u32, top as u32, width as u32, height as u32),
width,
height,
})
}
fn invert(&mut self) {
self.image.invert()
}
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: img,
})
}
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: new_img,
})
}
fn get_luma8_point(&self, x: usize, y: usize) -> u8 {
self.image.get_pixel(x as u32, y as u32).to_luma().0[0]
}
}
fn build_local_grey_image(source: DynamicImage) -> DynamicImage {
let raster = match source {
DynamicImage::ImageLuma8(img) => img,
DynamicImage::ImageLumaA8(img) => {
let mut raster: ImageBuffer<_, Vec<_>> = ImageBuffer::new(img.width(), img.height());
for (x, y, new_pixel) in raster.enumerate_pixels_mut() {
let pixel = img.get_pixel(x, y);
let [luma, alpha] = pixel.0;
if alpha == 0 {
// white, so we know its luminance is 255
*new_pixel = Luma([0xFF])
} else {
*new_pixel = Luma([luma.saturating_mul(alpha)])
}
}
raster
}
// DynamicImage::ImageRgb8(_) => todo!(),
// DynamicImage::ImageRgba8(_) => todo!(),
DynamicImage::ImageLuma16(img) => {
let mut raster: ImageBuffer<_, Vec<_>> = ImageBuffer::new(img.width(), img.height());
for (x, y, new_pixel) in raster.enumerate_pixels_mut() {
let pixel = img.get_pixel(x, y);
let [luma] = pixel.0;
*new_pixel = Luma([(luma / u8::MAX as u16) as u8])
}
raster
}
DynamicImage::ImageLumaA16(img) => {
let mut raster: ImageBuffer<_, Vec<_>> = ImageBuffer::new(img.width(), img.height());
for (x, y, new_pixel) in raster.enumerate_pixels_mut() {
let pixel = img.get_pixel(x, y);
let [luma, alpha] = pixel.0;
if alpha == 0 {
// white, so we know its luminance is 255
*new_pixel = Luma([0xFF])
} else {
*new_pixel = Luma([((luma.saturating_mul(alpha)) / u8::MAX as u16) as u8])
}
}
raster
}
// DynamicImage::ImageRgb16(_) => todo!(),
// DynamicImage::ImageRgba16(_) => todo!(),
// DynamicImage::ImageRgb32F(_) => todo!(),
// DynamicImage::ImageRgba32F(_) => todo!(),
_ => {
let img = source.to_rgba8();
let mut raster: ImageBuffer<_, Vec<_>> =
ImageBuffer::new(source.width(), source.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])
}
}
raster
}
};
DynamicImage::from(raster)
}