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mask util port and pass
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Henry Schimke
269
src/qrcode/encoder/mask_util.rs
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269
src/qrcode/encoder/mask_util.rs
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/*
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* Copyright 2008 ZXing authors
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*
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* Licensed under the Apache License, Version 2.0 (the "License");
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* you may not use this file except in compliance with the License.
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* You may obtain a copy of the License at
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*
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* http://www.apache.org/licenses/LICENSE-2.0
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*
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* Unless required by applicable law or agreed to in writing, software
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* distributed under the License is distributed on an "AS IS" BASIS,
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* WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
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* See the License for the specific language governing permissions and
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* limitations under the License.
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*/
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use crate::Exceptions;
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use super::ByteMatrix;
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/**
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* @author Satoru Takabayashi
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* @author Daniel Switkin
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* @author Sean Owen
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*/
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// Penalty weights from section 6.8.2.1
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const N1: u32 = 3;
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const N2: u32 = 3;
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const N3: u32 = 40;
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const N4: u32 = 10;
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/**
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* Apply mask penalty rule 1 and return the penalty. Find repetitive cells with the same color and
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* give penalty to them. Example: 00000 or 11111.
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*/
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pub fn applyMaskPenaltyRule1(matrix: &ByteMatrix) -> u32 {
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applyMaskPenaltyRule1Internal(matrix, true) + applyMaskPenaltyRule1Internal(matrix, false)
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}
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/**
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* Apply mask penalty rule 2 and return the penalty. Find 2x2 blocks with the same color and give
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* penalty to them. This is actually equivalent to the spec's rule, which is to find MxN blocks and give a
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* penalty proportional to (M-1)x(N-1), because this is the number of 2x2 blocks inside such a block.
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*/
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pub fn applyMaskPenaltyRule2(matrix: &ByteMatrix) -> u32 {
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let mut penalty = 0;
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let array = matrix.getArray();
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let width = matrix.getWidth();
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let height = matrix.getHeight();
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for y in 0..(height -1) as usize {
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// for (int y = 0; y < height - 1; y++) {
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let arrayY = &array[y];
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for x in 0..(width -1) as usize {
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// for (int x = 0; x < width - 1; x++) {
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let value = arrayY[x];
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if value == arrayY[x + 1] && value == array[y + 1][x] && value == array[y + 1][x + 1] {
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penalty += 1;
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}
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}
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}
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N2 * penalty
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}
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/**
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* Apply mask penalty rule 3 and return the penalty. Find consecutive runs of 1:1:3:1:1:4
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* starting with black, or 4:1:1:3:1:1 starting with white, and give penalty to them. If we
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* find patterns like 000010111010000, we give penalty once.
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*/
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pub fn applyMaskPenaltyRule3(matrix: &ByteMatrix) -> u32 {
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let mut numPenalties = 0;
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let array = matrix.getArray();
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let width = matrix.getWidth();
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let height = matrix.getHeight();
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for y in 0..height as usize {
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// for (int y = 0; y < height; y++) {
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for x in 0..width as usize {
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// for (int x = 0; x < width; x++) {
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let arrayY = &array[y]; // We can at least optimize this access
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if x + 6 < width as usize
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&& arrayY[x] == 1
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&& arrayY[x + 1] == 0
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&& arrayY[x + 2] == 1
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&& arrayY[x + 3] == 1
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&& arrayY[x + 4] == 1
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&& arrayY[x + 5] == 0
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&& arrayY[x + 6] == 1
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&& (isWhiteHorizontal(&arrayY, x as i32 - 4, x as u32)
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|| isWhiteHorizontal(&arrayY, x as i32 + 7, x as u32 + 11))
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{
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numPenalties += 1;
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}
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if y + 6 < height as usize
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&& array[y][x] == 1
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&& array[y + 1][x] == 0
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&& array[y + 2][x] == 1
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&& array[y + 3][x] == 1
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&& array[y + 4][x] == 1
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&& array[y + 5][x] == 0
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&& array[y + 6][x] == 1
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&& (isWhiteVertical(array, x as u32, y as i32 - 4, y as u32)
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|| isWhiteVertical(array, x as u32, y as i32 + 7, y as u32 + 11))
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{
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numPenalties += 1;
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}
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}
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}
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numPenalties * N3
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}
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pub fn isWhiteHorizontal(rowArray: &[u8], from: i32, to: u32) -> bool {
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if from < 0 || rowArray.len() < to as usize {
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return false;
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}
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for i in from..to as i32 {
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// for (int i = from; i < to; i++) {
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if rowArray[i as usize] == 1 {
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return false;
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}
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}
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return true;
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}
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pub fn isWhiteVertical(array: &Vec<Vec<u8>>, col: u32, from: i32, to: u32) -> bool {
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if from < 0 || array.len() < to as usize {
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return false;
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}
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for i in from..to as i32 {
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// for (int i = from; i < to; i++) {
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if array[i as usize][col as usize] == 1 {
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return false;
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}
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}
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return true;
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}
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/**
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* Apply mask penalty rule 4 and return the penalty. Calculate the ratio of dark cells and give
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* penalty if the ratio is far from 50%. It gives 10 penalty for 5% distance.
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*/
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pub fn applyMaskPenaltyRule4(matrix: &ByteMatrix) -> u32 {
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let mut numDarkCells = 0;
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let array = matrix.getArray();
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let width = matrix.getWidth();
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let height = matrix.getHeight();
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for y in 0..height as usize {
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// for (int y = 0; y < height; y++) {
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let arrayY = &array[y];
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for x in 0..width as usize {
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// for (int x = 0; x < width; x++) {
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if arrayY[x] == 1 {
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numDarkCells += 1;
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}
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}
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}
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let numTotalCells = matrix.getHeight() * matrix.getWidth();
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let fivePercentVariances = (numDarkCells as i64 * 2 - numTotalCells as i64).abs() as u32 * 10 / numTotalCells;
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return fivePercentVariances * N4;
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}
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/**
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* Return the mask bit for "getMaskPattern" at "x" and "y". See 8.8 of JISX0510:2004 for mask
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* pattern conditions.
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*/
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pub fn getDataMaskBit(maskPattern: u32, x: u32, y: u32) -> Result<bool, Exceptions> {
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let intermediate = match maskPattern {
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0 => (y + x) & 0x1,
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1 => y & 0x1,
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2 => x % 3,
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3 => (y + x) % 3,
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4 => ((y / 2) + (x / 3)) & 0x1,
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5 => {
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let temp = y * x;
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(temp & 0x1) + (temp % 3)
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}
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6 => {
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let temp = y * x;
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((temp & 0x1) + (temp % 3)) & 0x1
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}
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7 => {
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let temp = y * x;
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((temp % 3) + ((y + x) & 0x1)) & 0x1
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}
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_ => {
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return Err(Exceptions::IllegalArgumentException(format!(
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"Invalid mask pattern: {}",
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maskPattern
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)))
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}
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};
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// switch (maskPattern) {
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// case 0:
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// intermediate = (y + x) & 0x1;
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// break;
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// case 1:
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// intermediate = y & 0x1;
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// break;
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// case 2:
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// intermediate = x % 3;
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// break;
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// case 3:
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// intermediate = (y + x) % 3;
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// break;
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// case 4:
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// intermediate = ((y / 2) + (x / 3)) & 0x1;
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// break;
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// case 5:
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// temp = y * x;
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// intermediate = (temp & 0x1) + (temp % 3);
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// break;
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// case 6:
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// temp = y * x;
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// intermediate = ((temp & 0x1) + (temp % 3)) & 0x1;
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// break;
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// case 7:
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// temp = y * x;
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// intermediate = ((temp % 3) + ((y + x) & 0x1)) & 0x1;
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// break;
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// default:
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// throw new IllegalArgumentException("Invalid mask pattern: " + maskPattern);
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// }
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Ok(intermediate == 0)
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}
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/**
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* Helper function for applyMaskPenaltyRule1. We need this for doing this calculation in both
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* vertical and horizontal orders respectively.
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*/
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fn applyMaskPenaltyRule1Internal(matrix: &ByteMatrix, isHorizontal: bool) -> u32 {
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let mut penalty = 0;
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let iLimit = if isHorizontal {
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matrix.getHeight()
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} else {
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matrix.getWidth()
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};
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let jLimit = if isHorizontal {
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matrix.getWidth()
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} else {
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matrix.getHeight()
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};
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let array = matrix.getArray();
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for i in 0..iLimit as usize {
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// for (int i = 0; i < iLimit; i++) {
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let mut numSameBitCells = 0;
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// let prevBit = -1;
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let mut prevBit = 0;
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for j in 0..jLimit as usize {
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// for (int j = 0; j < jLimit; j++) {
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let bit = if isHorizontal {
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array[i][j]
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} else {
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array[j][i]
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};
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if bit == prevBit {
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numSameBitCells += 1;
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} else {
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if numSameBitCells >= 5 {
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penalty += N1 + (numSameBitCells - 5);
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}
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numSameBitCells = 1; // Include the cell itself.
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prevBit = bit;
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}
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}
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if numSameBitCells >= 5 {
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penalty += N1 + (numSameBitCells - 5);
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}
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}
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return penalty;
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}
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