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/*
* Copyright 2007 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, HashSet};
use crate::common::Result;
use crate::qrcode::cpp_port::QrReader;
use crate::{
aztec::AztecReader, datamatrix::DataMatrixReader, maxicode::MaxiCodeReader,
oned::MultiFormatOneDReader, pdf417::PDF417Reader, qrcode::QRCodeReader, BarcodeFormat,
Binarizer, BinaryBitmap, DecodeHintType, DecodeHintValue, DecodingHintDictionary, Exceptions,
RXingResult, Reader,
};
/**
* MultiFormatReader is a convenience class and the main entry point into the library for most uses.
* By default it attempts to decode all barcode formats that the library supports. Optionally, you
* can provide a hints object to request different behavior, for example only decoding QR codes.
*
* @author Sean Owen
* @author dswitkin@google.com (Daniel Switkin)
*/
#[derive(Default)]
pub struct MultiUseMultiFormatReader {
hints: DecodingHintDictionary,
possible_formats: HashSet<BarcodeFormat>,
try_harder: bool,
one_d_reader: MultiFormatOneDReader,
qr_code_reader: QRCodeReader,
data_matrix_reader: DataMatrixReader,
aztec_reader: AztecReader,
pdf417_reader: PDF417Reader,
maxicode_reader: MaxiCodeReader,
cpp_qrcode_reader: QrReader,
}
impl Reader for MultiUseMultiFormatReader {
/**
* This version of decode honors the intent of Reader.decode(BinaryBitmap) in that it
* passes null as a hint to the decoders. However, that makes it inefficient to call repeatedly.
* Use setHints() followed by decodeWithState() for continuous scan applications.
*
* @param image The pixel data to decode
* @return The contents of the image
* @throws NotFoundException Any errors which occurred
*/
fn decode<B: Binarizer>(&mut self, image: &mut BinaryBitmap<B>) -> Result<RXingResult> {
self.set_hints(&HashMap::new());
self.decode_internal(image)
}
/**
* Decode an image using the hints provided. Does not honor existing state.
*
* @param image The pixel data to decode
* @param hints The hints to use, clearing the previous state.
* @return The contents of the image
* @throws NotFoundException Any errors which occurred
*/
fn decode_with_hints<B: Binarizer>(
&mut self,
image: &mut BinaryBitmap<B>,
hints: &DecodingHintDictionary,
) -> Result<RXingResult> {
self.set_hints(hints);
self.decode_internal(image)
}
fn reset(&mut self) {
self.one_d_reader.reset();
self.qr_code_reader.reset();
self.data_matrix_reader.reset();
self.aztec_reader.reset();
self.pdf417_reader.reset();
self.maxicode_reader.reset();
self.cpp_qrcode_reader.reset();
}
}
impl MultiUseMultiFormatReader {
/**
* Decode an image using the state set up by calling setHints() previously. Continuous scan
* clients will get a <b>large</b> speed increase by using this instead of decode().
*
* @param image The pixel data to decode
* @return The contents of the image
* @throws NotFoundException Any errors which occurred
*/
pub fn decode_with_state<B: Binarizer>(
&mut self,
image: &mut BinaryBitmap<B>,
) -> Result<RXingResult> {
// Make sure to set up the default state so we don't crash
if self.possible_formats.is_empty() {
self.set_hints(&HashMap::new());
}
self.decode_internal(image)
}
/**
* This method adds state to the MultiFormatReader. By setting the hints once, subsequent calls
* to decodeWithState(image) can reuse the same set of readers without reallocating memory. This
* is important for performance in continuous scan clients.
*
* @param hints The set of hints to use for subsequent calls to decode(image)
*/
pub fn set_hints(&mut self, hints: &DecodingHintDictionary) {
self.hints = hints.clone();
self.try_harder = matches!(
self.hints.get(&DecodeHintType::TRY_HARDER),
Some(DecodeHintValue::TryHarder(true))
);
self.possible_formats = if let Some(DecodeHintValue::PossibleFormats(formats)) =
hints.get(&DecodeHintType::POSSIBLE_FORMATS)
{
formats.clone()
} else {
HashSet::new()
};
self.one_d_reader = MultiFormatOneDReader::new(hints);
}
pub fn decode_internal<B: Binarizer>(
&mut self,
image: &mut BinaryBitmap<B>,
) -> Result<RXingResult> {
let res = self.decode_formats(image);
if res.is_ok() {
return res;
}
if matches!(
self.hints.get(&DecodeHintType::ALSO_INVERTED),
Some(DecodeHintValue::AlsoInverted(true))
) {
// Calling all readers again with inverted image
image.get_black_matrix_mut().flip_self();
let res = self.decode_formats(image);
if res.is_ok() {
let mut r = res.unwrap();
r.putMetadata(
crate::RXingResultMetadataType::IS_INVERTED,
crate::RXingResultMetadataValue::IsInverted(true),
);
return Ok(r);
}
// if res.is_ok() {
// return res;
// }
}
Err(Exceptions::NOT_FOUND)
}
fn decode_formats<B: Binarizer>(&mut self, image: &mut BinaryBitmap<B>) -> Result<RXingResult> {
if !self.possible_formats.is_empty() {
let one_d = self.possible_formats.contains(&BarcodeFormat::UPC_A)
|| self.possible_formats.contains(&BarcodeFormat::UPC_E)
|| self.possible_formats.contains(&BarcodeFormat::EAN_13)
|| self.possible_formats.contains(&BarcodeFormat::EAN_8)
|| self.possible_formats.contains(&BarcodeFormat::CODABAR)
|| self.possible_formats.contains(&BarcodeFormat::CODE_39)
|| self.possible_formats.contains(&BarcodeFormat::CODE_93)
|| self.possible_formats.contains(&BarcodeFormat::CODE_128)
|| self.possible_formats.contains(&BarcodeFormat::ITF)
|| self.possible_formats.contains(&BarcodeFormat::RSS_14)
|| self.possible_formats.contains(&BarcodeFormat::RSS_EXPANDED);
if one_d && !self.try_harder {
if let Ok(res) = self.one_d_reader.decode_with_hints(image, &self.hints) {
return Ok(res);
}
}
for possible_format in self.possible_formats.iter() {
let res = match possible_format {
BarcodeFormat::QR_CODE => {
let a = self.cpp_qrcode_reader.decode_with_hints(image, &self.hints);
if a.is_ok() {
a
} else {
self.qr_code_reader.decode_with_hints(image, &self.hints)
}
}
BarcodeFormat::MICRO_QR_CODE => {
self.cpp_qrcode_reader.decode_with_hints(image, &self.hints)
}
BarcodeFormat::DATA_MATRIX => self
.data_matrix_reader
.decode_with_hints(image, &self.hints),
BarcodeFormat::AZTEC => self.aztec_reader.decode_with_hints(image, &self.hints),
BarcodeFormat::PDF_417 => {
self.pdf417_reader.decode_with_hints(image, &self.hints)
}
BarcodeFormat::MAXICODE => {
self.maxicode_reader.decode_with_hints(image, &self.hints)
}
_ => Err(Exceptions::UNSUPPORTED_OPERATION),
};
if res.is_ok() {
return res;
}
}
if one_d && self.try_harder {
if let Ok(res) = self.one_d_reader.decode_with_hints(image, &self.hints) {
return Ok(res);
}
}
} else {
if !self.try_harder {
if let Ok(res) = self.one_d_reader.decode_with_hints(image, &self.hints) {
return Ok(res);
}
}
if let Ok(res) = self.cpp_qrcode_reader.decode_with_hints(image, &self.hints) {
return Ok(res);
}
if let Ok(res) = self.qr_code_reader.decode_with_hints(image, &self.hints) {
return Ok(res);
}
if let Ok(res) = self
.data_matrix_reader
.decode_with_hints(image, &self.hints)
{
return Ok(res);
}
if let Ok(res) = self.aztec_reader.decode_with_hints(image, &self.hints) {
return Ok(res);
}
if let Ok(res) = self.pdf417_reader.decode_with_hints(image, &self.hints) {
return Ok(res);
}
if let Ok(res) = self.maxicode_reader.decode_with_hints(image, &self.hints) {
return Ok(res);
}
if self.try_harder {
if let Ok(res) = self.one_d_reader.decode_with_hints(image, &self.hints) {
return Ok(res);
}
}
}
Err(Exceptions::UNSUPPORTED_OPERATION)
}
}