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Minor Dotcode tweaks

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Slight modification brings code inline with latest version of draft standard.
Thanks to input from Terry Burton at BWIPP
This commit is contained in:
Robin Stuart 2019-10-31 13:27:36 +00:00
parent c87c86e30a
commit 1a5eb573cf
1 changed files with 24 additions and 25 deletions
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49
backend/dotcode.c
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@ -2,7 +2,7 @@
/*
libzint - the open source barcode library
Copyright (C) 2017 Robin Stuart <rstuart114@gmail.com>
Copyright (C) 2017-2019 Robin Stuart <rstuart114@gmail.com>
Redistribution and use in source and binary forms, with or without
modification, are permitted provided that the following conditions
@ -32,6 +32,7 @@
/*
* Attempts to encode DotCode according to AIMD013 Rev 1.34a, dated Feb 19, 2009
* Incorporating suggestions from Terry Burton at BWIPP
*/
#include <stdio.h>
@ -49,6 +50,7 @@
#define GF 113
#define PM 3
#define SCORE_UNLIT_EDGE -99999
/* DotCode symbol character dot patterns, from Annex C */
static const unsigned short int dot_patterns[113] = {
@ -105,7 +107,6 @@ const int score_array(char Dots[], int Hgt, int Wid) {
int x, y, worstedge, first, last, sum;
int penalty_local = 0;
int penalty = 0;
int t = 0, b = 0, l = 0, r = 0;
// first, guard against "pathelogical" gaps in the array
if (Hgt & 1) {
@ -165,9 +166,9 @@ const int score_array(char Dots[], int Hgt, int Wid) {
}
worstedge = sum + last - first;
worstedge *= Hgt;
if (sum == 0) {
t = 1;
return SCORE_UNLIT_EDGE; // guard against empty top edge
}
sum = 0;
@ -188,9 +189,9 @@ const int score_array(char Dots[], int Hgt, int Wid) {
if (sum < worstedge) {
worstedge = sum;
}
if (sum == 0) {
b = 2;
return SCORE_UNLIT_EDGE; // guard against empty bottom edge
}
sum = 0;
@ -211,9 +212,9 @@ const int score_array(char Dots[], int Hgt, int Wid) {
if (sum < worstedge) {
worstedge = sum;
}
if (sum == 0) {
l = 4;
return SCORE_UNLIT_EDGE; // guard against empty left edge
}
sum = 0;
@ -234,12 +235,10 @@ const int score_array(char Dots[], int Hgt, int Wid) {
if (sum < worstedge) {
worstedge = sum;
}
if (sum == 0) {
r = 8;
}
penalty += (t + b + l + r) * 100000;
if (sum == 0) {
return SCORE_UNLIT_EDGE; // guard against empty right edge
}
// throughout the array, count the # of unprinted 5-somes (cross patterns)
// plus the # of printed dots surrounded by 8 unprinted neighbors
@ -667,7 +666,7 @@ int dotcode_encode_message(struct zint_symbol *symbol, const unsigned char sourc
}
}
/* Setp B3 */
/* Step B3 */
if ((!done) && (encoding_mode == 'C')) {
if (binary(source, input_position)) {
if (n_digits(source, input_position + 1, length) > 0) {
@ -1212,7 +1211,7 @@ void fold_dotstream(char dot_stream[], int width, int height, char dot_array[])
void apply_mask(int mask, int data_length, unsigned char *masked_codeword_array, unsigned char *codeword_array, int ecc_length, char *dot_stream) {
int weight = 0;
int j;
switch (mask) {
case 0:
masked_codeword_array[0] = 0;
@ -1421,7 +1420,7 @@ int dotcode(struct zint_symbol *symbol, const unsigned char source[], int length
for (i = 0; i < 4; i++) {
apply_mask(i, data_length, masked_codeword_array, codeword_array, ecc_length, dot_stream);
dot_stream_length = make_dotstream(masked_codeword_array, (data_length + ecc_length + 1), dot_stream);
/* Add pad bits */
@ -1442,18 +1441,18 @@ int dotcode(struct zint_symbol *symbol, const unsigned char source[], int length
best_mask = 0;
for (i = 1; i < 4; i++) {
if (mask_score[i] > high_score) {
if (mask_score[i] >= high_score) {
high_score = mask_score[i];
best_mask = i;
}
}
/* Re-evaluate using forced corners if needed */
if (best_mask <= (height * width) / 2) {
for (i = 0; i < 4; i++) {
apply_mask(i, data_length, masked_codeword_array, codeword_array, ecc_length, dot_stream);
dot_stream_length = make_dotstream(masked_codeword_array, (data_length + ecc_length + 1), dot_stream);
/* Add pad bits */
@ -1462,7 +1461,7 @@ int dotcode(struct zint_symbol *symbol, const unsigned char source[], int length
}
fold_dotstream(dot_stream, width, height, dot_array);
force_corners(width, height, dot_array);
mask_score[i + 4] = score_array(dot_array, height, width);
@ -1471,22 +1470,22 @@ int dotcode(struct zint_symbol *symbol, const unsigned char source[], int length
printf("Mask %d score is %d\n", i + 4, mask_score[i + 4]);
}
}
for (i = 4; i < 8; i++) {
if (mask_score[i] > high_score) {
if (mask_score[i] >= high_score) {
high_score = mask_score[i];
best_mask = i;
}
}
}
if (debug) {
printf("Applying mask %d\n", best_mask);
}
/* Apply best mask */
apply_mask(best_mask % 4, data_length, masked_codeword_array, codeword_array, ecc_length, dot_stream);
dot_stream_length = make_dotstream(masked_codeword_array, (data_length + ecc_length + 1), dot_stream);
/* Add pad bits */
@ -1495,7 +1494,7 @@ int dotcode(struct zint_symbol *symbol, const unsigned char source[], int length
}
fold_dotstream(dot_stream, width, height, dot_array);
if (best_mask >= 4) {
force_corners(width, height, dot_array);
}