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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.
*/
//package com.google.zxing;
use crate::common::Result;
use crate::{Exceptions, LuminanceSource};
/**
* This class is used to help decode images from files which arrive as RGB data from
* an ARGB pixel array. It does not support rotation.
*
* @author dswitkin@google.com (Daniel Switkin)
* @author Betaminos
*/
#[derive(Debug, Clone)]
pub struct RGBLuminanceSource {
luminances: Vec<u8>,
dataWidth: usize,
dataHeight: usize,
left: usize,
top: usize,
width: usize,
height: usize,
invert: bool,
}
impl LuminanceSource for RGBLuminanceSource {
/// gets a row, returns an empty row if we are out of bounds.
fn get_row(&self, y: usize) -> Vec<u8> {
if y >= self.get_height() {
return Vec::new();
}
let width = self.get_width();
let offset = (y + self.top) * self.dataWidth + self.left;
let mut row = vec![0; width];
row[..width].clone_from_slice(&self.luminances[offset..offset + width]);
if self.invert {
row = self.invert_block_of_bytes(row);
}
row
}
fn get_matrix(&self) -> Vec<u8> {
let width = self.get_width();
let height = self.get_height();
// If the caller asks for the entire underlying image, save the copy and give them the
// original data. The docs specifically warn that result.length must be ignored.
if width == self.dataWidth && height == self.dataHeight {
let mut z = self.luminances.clone();
if self.invert {
z = self.invert_block_of_bytes(z);
}
return z;
}
let area = width * height;
let mut matrix = vec![0; area];
let mut inputOffset = self.top * self.dataWidth + self.left;
// If the width matches the full width of the underlying data, perform a single copy.
if width == self.dataWidth {
matrix[..area].clone_from_slice(&self.luminances[inputOffset..area + inputOffset]);
if self.invert {
matrix = self.invert_block_of_bytes(matrix);
}
return matrix;
}
// Otherwise copy one cropped row at a time.
for y in 0..height {
let outputOffset = y * width;
matrix[outputOffset..width + outputOffset]
.clone_from_slice(&self.luminances[inputOffset..width + inputOffset]);
inputOffset += self.dataWidth;
}
if self.invert {
matrix = self.invert_block_of_bytes(matrix);
}
matrix
}
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> {
RGBLuminanceSource::new_complex(
&self.luminances,
self.dataWidth,
self.dataHeight,
self.left + left,
self.top + top,
width,
height,
)
.map_err(|_| Exceptions::UNSUPPORTED_OPERATION)
}
fn invert(&mut self) {
self.invert = !self.invert;
}
}
impl RGBLuminanceSource {
pub fn new_with_width_height_pixels(width: usize, height: usize, pixels: &[u32]) -> Self {
let dataWidth = width;
let dataHeight = height;
let left = 0;
let top = 0;
// In order to measure pure decoding speed, we convert the entire image to a greyscale array
// up front, which is the same as the Y channel of the YUVLuminanceSource in the real app.
//
// Total number of pixels suffices, can ignore shape
let size = width * height;
let mut luminances: Vec<u8> = vec![0; size];
for offset in 0..size {
let pixel = pixels[offset];
let r = (pixel >> 16) & 0xff; // red
let g2 = (pixel >> 7) & 0x1fe; // 2 * green
let b = pixel & 0xff; // blue
// Calculate green-favouring average cheaply
luminances[offset] = ((r + g2 + b) / 4) as u8;
}
Self {
luminances,
dataWidth,
dataHeight,
left,
top,
width,
height,
invert: false,
}
}
fn new_complex(
pixels: &[u8],
data_width: usize,
data_height: usize,
left: usize,
top: usize,
width: usize,
height: usize,
) -> Result<Self> {
if left + width > data_width || top + height > data_height {
return Err(Exceptions::illegal_argument_with(
"Crop rectangle does not fit within image data.",
));
}
Ok(Self {
luminances: pixels.to_owned(),
dataWidth: data_width,
dataHeight: data_height,
left,
top,
width,
height,
invert: false,
})
}
}