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by_quandrant_reader port

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Henry Schimke
2022-12-01 14:07:40 -06:00
parent 7aea861417
commit 2d37d398e6
4 changed files with 183 additions and 117 deletions
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117
src/multi/ByQuadrantReader.java
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@@ -1,117 +0,0 @@
/*
* 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.multi;
import com.google.zxing.BinaryBitmap;
import com.google.zxing.ChecksumException;
import com.google.zxing.DecodeHintType;
import com.google.zxing.FormatException;
import com.google.zxing.NotFoundException;
import com.google.zxing.Reader;
import com.google.zxing.RXingResult;
import com.google.zxing.RXingResultPoint;
import java.util.Map;
/**
* This class attempts to decode a barcode from an image, not by scanning the whole image,
* but by scanning subsets of the image. This is important when there may be multiple barcodes in
* an image, and detecting a barcode may find parts of multiple barcode and fail to decode
* (e.g. QR Codes). Instead this scans the four quadrants of the image -- and also the center
* 'quadrant' to cover the case where a barcode is found in the center.
*
* @see GenericMultipleBarcodeReader
*/
public final class ByQuadrantReader implements Reader {
private final Reader delegate;
public ByQuadrantReader(Reader delegate) {
this.delegate = delegate;
}
@Override
public RXingResult decode(BinaryBitmap image)
throws NotFoundException, ChecksumException, FormatException {
return decode(image, null);
}
@Override
public RXingResult decode(BinaryBitmap image, Map<DecodeHintType,?> hints)
throws NotFoundException, ChecksumException, FormatException {
int width = image.getWidth();
int height = image.getHeight();
int halfWidth = width / 2;
int halfHeight = height / 2;
try {
// No need to call makeAbsolute as results will be relative to original top left here
return delegate.decode(image.crop(0, 0, halfWidth, halfHeight), hints);
} catch (NotFoundException re) {
// continue
}
try {
RXingResult result = delegate.decode(image.crop(halfWidth, 0, halfWidth, halfHeight), hints);
makeAbsolute(result.getRXingResultPoints(), halfWidth, 0);
return result;
} catch (NotFoundException re) {
// continue
}
try {
RXingResult result = delegate.decode(image.crop(0, halfHeight, halfWidth, halfHeight), hints);
makeAbsolute(result.getRXingResultPoints(), 0, halfHeight);
return result;
} catch (NotFoundException re) {
// continue
}
try {
RXingResult result = delegate.decode(image.crop(halfWidth, halfHeight, halfWidth, halfHeight), hints);
makeAbsolute(result.getRXingResultPoints(), halfWidth, halfHeight);
return result;
} catch (NotFoundException re) {
// continue
}
int quarterWidth = halfWidth / 2;
int quarterHeight = halfHeight / 2;
BinaryBitmap center = image.crop(quarterWidth, quarterHeight, halfWidth, halfHeight);
RXingResult result = delegate.decode(center, hints);
makeAbsolute(result.getRXingResultPoints(), quarterWidth, quarterHeight);
return result;
}
@Override
public void reset() {
delegate.reset();
}
private static void makeAbsolute(RXingResultPoint[] points, int leftOffset, int topOffset) {
if (points != null) {
for (int i = 0; i < points.length; i++) {
RXingResultPoint relative = points[i];
if (relative != null) {
points[i] = new RXingResultPoint(relative.getX() + leftOffset, relative.getY() + topOffset);
}
}
}
}
}

168
src/multi/by_quadrant_reader.rs Normal file
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@@ -0,0 +1,168 @@
/*
* 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::collections::HashMap;
use crate::{Exceptions, RXingResult, RXingResultPoint, Reader, ResultPoint};
/**
* This class attempts to decode a barcode from an image, not by scanning the whole image,
* but by scanning subsets of the image. This is important when there may be multiple barcodes in
* an image, and detecting a barcode may find parts of multiple barcode and fail to decode
* (e.g. QR Codes). Instead this scans the four quadrants of the image -- and also the center
* 'quadrant' to cover the case where a barcode is found in the center.
*
* @see GenericMultipleBarcodeReader
*/
pub struct ByQuadrantReader<T: Reader>(T);
impl<T: Reader> Reader for ByQuadrantReader<T> {
fn decode(
&mut self,
image: &crate::BinaryBitmap,
) -> Result<crate::RXingResult, crate::Exceptions> {
self.decode_with_hints(image, &HashMap::new())
}
fn decode_with_hints(
&mut self,
image: &crate::BinaryBitmap,
hints: &crate::DecodingHintDictionary,
) -> Result<crate::RXingResult, crate::Exceptions> {
let width = image.getWidth();
let height = image.getHeight();
let halfWidth = width / 2;
let halfHeight = height / 2;
// try {
let attempt = self
.0
.decode_with_hints(&image.crop(0, 0, halfWidth, halfHeight), hints);
// No need to call makeAbsolute as results will be relative to original top left here
match attempt {
// Ok() => return attempt,
Err(Exceptions::NotFoundException(_)) => {}
_ => return attempt,
}
// } catch (NotFoundException re) {
// continue
// }
// try {
let result = self
.0
.decode_with_hints(&image.crop(halfWidth, 0, halfWidth, halfHeight), hints);
match result {
Ok(res) => {
let points = Self::makeAbsolute(res.getRXingResultPoints(), halfWidth as f32, 0.0);
return Ok(RXingResult::new_from_existing_result(res, points));
}
Err(Exceptions::NotFoundException(_)) => {}
_ => return result,
}
// makeAbsolute(result.getRXingResultPoints(), halfWidth, 0);
// return result;
// } catch (NotFoundException re) {
// continue
// }
let result = self
.0
.decode_with_hints(&image.crop(0, halfHeight, halfWidth, halfHeight), hints);
match result {
Ok(res) => {
let points = Self::makeAbsolute(res.getRXingResultPoints(), 0.0, halfHeight as f32);
return Ok(RXingResult::new_from_existing_result(res, points));
}
Err(Exceptions::NotFoundException(_)) => {}
_ => return result,
}
// try {
// RXingResult result = delegate.decode(image.crop(0, halfHeight, halfWidth, halfHeight), hints);
// makeAbsolute(result.getRXingResultPoints(), 0, halfHeight);
// return result;
// } catch (NotFoundException re) {
// // continue
// }
let result = self.0.decode_with_hints(
&image.crop(halfWidth, halfHeight, halfWidth, halfHeight),
hints,
);
match result {
Ok(res) => {
let points = Self::makeAbsolute(
res.getRXingResultPoints(),
halfWidth as f32,
halfHeight as f32,
);
return Ok(RXingResult::new_from_existing_result(res, points));
}
Err(Exceptions::NotFoundException(_)) => {}
_ => return result,
}
// try {
// RXingResult result = delegate.decode(image.crop(halfWidth, halfHeight, halfWidth, halfHeight), hints);
// makeAbsolute(result.getRXingResultPoints(), halfWidth, halfHeight);
// return result;
// } catch (NotFoundException re) {
// // continue
// }
let quarterWidth = halfWidth / 2;
let quarterHeight = halfHeight / 2;
let center = image.crop(quarterWidth, quarterHeight, halfWidth, halfHeight);
let result = self.0.decode_with_hints(&center, hints)?;
let points = Self::makeAbsolute(
result.getRXingResultPoints(),
quarterWidth as f32,
quarterHeight as f32,
);
Ok(RXingResult::new_from_existing_result(result, points))
}
fn reset(&mut self) {
self.0.reset()
}
}
impl<T: Reader> ByQuadrantReader<T> {
pub fn new(delegate: T) -> Self {
Self(delegate)
}
fn makeAbsolute(
points: &[RXingResultPoint],
leftOffset: f32,
topOffset: f32,
) -> Vec<RXingResultPoint> {
let mut result = Vec::new();
if !points.is_empty() {
for relative in points {
// for (int i = 0; i < points.length; i++) {
// let relative = points[i];
// if relative != null {
result.push(RXingResultPoint::new(
relative.getX() + leftOffset,
relative.getY() + topOffset,
));
// }
}
}
result
}
}

3
src/multi/mod.rs
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@@ -1,3 +1,6 @@
mod multiple_barcode_reader;
pub mod qrcode;
pub use multiple_barcode_reader::*;
mod by_quadrant_reader;
pub use by_quadrant_reader::*;

12
src/rxing_result.rs
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@@ -91,6 +91,18 @@ impl RXingResult {
}
}
pub fn new_from_existing_result(prev: Self, points: Vec<RXingResultPoint>) -> Self {
Self {
text: prev.text,
rawBytes: prev.rawBytes,
numBits: prev.numBits,
resultPoints: points,
format: prev.format,
resultMetadata: prev.resultMetadata,
timestamp: prev.timestamp,
}
}
/**
* @return raw text encoded by the barcode
*/