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Correctly determine symbol size accoding to section 5.2.2

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Bug fix by Milton Neil <miltonneal@bigpond.com>
This commit is contained in:
Robin Stuart 2017-02-14 11:04:58 +00:00
parent 319c7791bc
commit a77e448df5
1 changed files with 41 additions and 12 deletions
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53
backend/dotcode.c
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@ -266,7 +266,7 @@ int datum_b(const unsigned char source[], int position, int length) {
int datum_c(const unsigned char source[], int position, int length) {
int retval = 0;
if (position < length - 2) {
if (position <= length - 2) {
if (((source[position] >= '0') && (source[position] <= '9'))
&& ((source[position + 1] >= '0') && (source[position + 1] <= '9')))
retval = 1;
@ -1039,7 +1039,7 @@ int dotcode(struct zint_symbol *symbol, const unsigned char source[], int length
int i, j, k;
size_t jc;
int data_length, ecc_length;
int min_dots, n_dots;
int min_dots, n_dots, min_area;
int height, width, pad_chars;
int mask_score[4];
int weight;
@ -1066,23 +1066,52 @@ int dotcode(struct zint_symbol *symbol, const unsigned char source[], int length
}
min_dots = 9 * (data_length + 3 + (data_length / 2)) + 2;
min_area = min_dots * 2;
if (symbol->option_2 == 0) {
/* Automatic sizing */
/* Following Rule 3 (Section 5.2.2) and applying a recommended width to height ratio 3:2 */
/* Eliminates under sized symbols */
float h = (float)(sqrt(min_area * 0.666));
float w = (float)(sqrt(min_area * 1.5));
height = (int) sqrt(2.0 * min_dots);
if (height % 2) {
height++;
}
width = (2 * min_dots) / height;
if (!(width % 2)) {
width++;
height = (int) h;
width = (int) w;
if ((width + height) % 2 == 1){
if ((width * height) < min_area){
width++;
height++;
}
} else {
if ((h * width) < (w * height)){
width++;
if ((width * height) < min_area){
width--;
height++;
if ((width * height) < min_area){
width += 2;
}
}
} else {
height++;
if ((width * height) < min_area){
width++;
height--;
if ((width * height) < min_area){
height += 2;
}
}
}
}
} else {
/* User defined width */
/* Eliminates under sized symbols */
width = symbol->option_2;
height = (2 * min_dots) / width;
height = (min_area + (width - 1)) / width;
if (!((width + height) % 2)) {
height++;