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zint/backend/render.c

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/*
* render.c - Generic Rendered Format
*
* Initiall written by Sam Lown for use in gLabels. Converts encoded
* data into a generic internal structure of lines and characters
* usable in external applications.
*/
/*
libzint - the open source barcode library
Copyright (C) 2009 Robin Stuart <robin@zint.org.uk>
This program is free software; you can redistribute it and/or modify
it under the terms of the GNU General Public License as published by
the Free Software Foundation; either version 3 of the License, or
(at your option) any later version.
This program is distributed in the hope that it will be useful,
but WITHOUT ANY WARRANTY; without even the implied warranty of
MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
GNU General Public License for more details.
You should have received a copy of the GNU General Public License along
with this program; if not, write to the Free Software Foundation, Inc.,
51 Franklin Street, Fifth Floor, Boston, MA 02110-1301 USA.
*/
#include <locale.h>
#include <string.h>
#include <stdlib.h>
#include <stdio.h>
#include "common.h"
struct zint_render_line *render_plot_create_line(float x, float y, float width, float length);
int render_plot_add_line(struct zint_symbol *symbol, struct zint_render_line *line, struct zint_render_line **last_line);
int render_plot_add_string(struct zint_symbol *symbol, char *text, float x, float y, float fsize, float width, struct zint_render_string **last_string);
int render_plot(struct zint_symbol *symbol, unsigned int hide_text, float width, float height)
{
struct zint_render *render;
struct zint_render_line *line, *last_line = NULL;
struct zint_render_string *last_string = NULL;
int i, r, block_width, latch, this_row;
float textpos, textwidth, large_bar_height, preset_height, row_height, row_posn = 0.0;
// int error_number = 0;
int textoffset, textheight, xoffset, yoffset, textdone, main_width;
char addon[6], textpart[10];
int large_bar_count, comp_offset;
float addon_text_posn;
float default_text_posn;
float scaler = symbol->scale;
float w, h;
const char *locale = NULL;
// Allocate memory for the rendered version
render = symbol->rendered = malloc(sizeof(struct zint_render));
render->lines = NULL;
render->strings = NULL;
locale = setlocale(LC_ALL, "C");
row_height = 0;
textdone = 0;
textpos = 0.0;
main_width = symbol->width;
strcpy(addon, "");
comp_offset = 0;
addon_text_posn = 0.0;
/*
* Determine if there will be any addon texts and text height
*/
latch = 0;
r = 0;
/* Isolate add-on text */
if(is_extendable(symbol->symbology)) {
for(i = 0; i < ustrlen(symbol->text); i++) {
if (latch == 1) {
addon[r] = symbol->text[i];
r++;
}
if (symbol->text[i] == '+') {
latch = 1;
}
}
}
addon[r] = '\0';
if((symbol->show_hrt == 0) || (ustrlen(symbol->text) != 0)) {
hide_text = 0;
}
if(!hide_text && ustrlen(symbol->text)) {
textheight = 9.0;
textoffset = 2.0;
} else {
textheight = textoffset = 0.0;
}
/*
* Calculate the width of the barcode, especially if there are any extra
* borders or white space to add.
*/
while(!(module_is_set(symbol, symbol->rows - 1, comp_offset))) {
comp_offset++;
}
/* Certain symbols need whitespace otherwise characters get chopped off the sides */
if ((((symbol->symbology == BARCODE_EANX) && (symbol->rows == 1)) || (symbol->symbology == BARCODE_EANX_CC))
|| (symbol->symbology == BARCODE_ISBNX)) {
switch(ustrlen(symbol->text)) {
case 13: /* EAN 13 */
case 16:
case 19:
if(symbol->whitespace_width == 0) {
symbol->whitespace_width = 10;
}
main_width = 96 + comp_offset;
break;
default:
main_width = 68 + comp_offset;
}
}
if (((symbol->symbology == BARCODE_UPCA) && (symbol->rows == 1)) || (symbol->symbology == BARCODE_UPCA_CC)) {
if(symbol->whitespace_width == 0) {
symbol->whitespace_width = 10;
main_width = 96 + comp_offset;
}
}
if (((symbol->symbology == BARCODE_UPCE) && (symbol->rows == 1)) || (symbol->symbology == BARCODE_UPCE_CC)) {
if(symbol->whitespace_width == 0) {
symbol->whitespace_width = 10;
main_width = 51 + comp_offset;
}
}
xoffset = symbol->border_width + symbol->whitespace_width;
// Calculate the initial scale factor if width provided
w = main_width + (xoffset * 2);
if (width) {
scaler = width / w;
}
/*
* Calculate the height
*/
if (height) {
symbol->height = height / scaler; // starting height
} else if (symbol->height == 0) {
symbol->height = 50;
}
// Update height for texts
symbol->height -= textheight + textoffset;
// Determine if height should be overridden
large_bar_count = 0;
preset_height = 0.0;
for(i = 0; i < symbol->rows; i++) {
preset_height += symbol->row_height[i];
if(symbol->row_height[i] == 0) {
large_bar_count++;
}
}
large_bar_height = (symbol->height - preset_height) / large_bar_count;
if (large_bar_count == 0) {
symbol->height = preset_height;
}
yoffset = symbol->border_width;
// Calculate the scale factor from the height, incase it needs to be lowered for width
h = (symbol->height + textheight + textoffset + (yoffset * 2));
if ((h * scaler) > height) {
scaler = height / h;
}
// Set initial render dimensions
render->width = w * scaler;
render->height = h * scaler;
if(((symbol->output_options & BARCODE_BOX) != 0) || ((symbol->output_options & BARCODE_BIND) != 0)) {
default_text_posn = (symbol->height + textoffset + symbol->border_width + symbol->border_width) * scaler;
} else {
default_text_posn = (symbol->height + textoffset + symbol->border_width) * scaler;
}
// SAMS ORIGINAL // default_text_posn = (symbol->height + textoffset + symbol->border_width) * scaler;
if(symbol->symbology == BARCODE_MAXICODE) {
/*
* TODO INSERT BARCODE_MAXICODE HERE!
*/
} else {
/* everything else uses rectangles (or squares) */
/* Works from the bottom of the symbol up */
int addon_latch = 0;
for(r = 0; r < symbol->rows; r++) {
this_row = r;
if(symbol->row_height[this_row] == 0) {
row_height = large_bar_height;
} else {
row_height = symbol->row_height[this_row];
}
row_posn = 0;
for(i = 0; i < r; i++) {
if(symbol->row_height[i] == 0) {
row_posn += large_bar_height;
} else {
row_posn += symbol->row_height[i];
}
}
row_posn += yoffset;
i = 0;
if(module_is_set(symbol, this_row, 0)) {
latch = 1;
} else {
latch = 0;
}
do {
block_width = 0;
do {
block_width++;
} while (module_is_set(symbol, this_row, i + block_width) == module_is_set(symbol, this_row, i));
if((addon_latch == 0) && (r == (symbol->rows - 1)) && (i > main_width)) {
addon_text_posn = (row_posn + 8.0) * scaler;
addon_latch = 1;
}
if(latch == 1) {
/* a bar */
line = malloc(sizeof(struct zint_render_line));
line->next = NULL;
line->width = block_width * scaler;
line->x = (i + xoffset) * scaler;
if(addon_latch == 0) {
line->y = row_posn * scaler;
line->length = row_height * scaler;
} else {
line->y = (row_posn + 10.0) * scaler;
line->length = (row_height - 5.0) * scaler;
}
latch = 0;
render_plot_add_line(symbol, line, &last_line);
} else {
/* a space */
latch = 1;
}
i += block_width;
} while (i < symbol->width);
}
}
/* That's done the actual data area, everything else is human-friendly */
/* Add the text */
xoffset -= comp_offset;
row_posn = (row_posn + large_bar_height) * scaler;
if (!hide_text) {
if ((((symbol->symbology == BARCODE_EANX) && (symbol->rows == 1)) || (symbol->symbology == BARCODE_EANX_CC)) ||
(symbol->symbology == BARCODE_ISBNX)) {
/* guard bar extensions and text formatting for EAN8 and EAN13 */
switch(ustrlen(symbol->text)) {
case 8: /* EAN-8 */
case 11:
case 14:
line = render_plot_create_line((0 + xoffset) * scaler, row_posn, scaler, 5.0 * scaler);
render_plot_add_line(symbol, line, &last_line);
line = render_plot_create_line((2 + xoffset) * scaler, row_posn, scaler, 5.0 * scaler);
render_plot_add_line(symbol, line, &last_line);
line = render_plot_create_line((32 + xoffset) * scaler, row_posn, scaler, 5.0 * scaler);
render_plot_add_line(symbol, line, &last_line);
line = render_plot_create_line((34 + xoffset) * scaler, row_posn, scaler, 5.0 * scaler);
render_plot_add_line(symbol, line, &last_line);
line = render_plot_create_line((64 + xoffset) * scaler, row_posn, scaler, 5.0 * scaler);
render_plot_add_line(symbol, line, &last_line);
line = render_plot_create_line((66 + xoffset) * scaler, row_posn, scaler, 5.0 * scaler);
render_plot_add_line(symbol, line, &last_line);
for(i = 0; i < 4; i++) {
textpart[i] = symbol->text[i];
}
textpart[4] = '\0';
textpos = 17;
textwidth = 28.0;
render_plot_add_string(symbol, textpart, (textpos + xoffset) * scaler, default_text_posn, 9.0 * scaler, textwidth * scaler, &last_string);
for(i = 0; i < 4; i++) {
textpart[i] = symbol->text[i + 4];
}
textpart[4] = '\0';
textpos = 50;
render_plot_add_string(symbol, textpart, (textpos + xoffset) * scaler, default_text_posn, 9.0 * scaler, textwidth * scaler, &last_string);
textdone = 1;
switch(strlen(addon)) {
case 2:
textpos = xoffset + 86;
textwidth = 2.0 * 7.0;
render_plot_add_string(symbol, addon, textpos * scaler, addon_text_posn * scaler, 9.0 * scaler, textwidth * scaler, &last_string);
break;
case 5:
textpos = xoffset + 100;
textwidth = 5.0 * 7.0;
render_plot_add_string(symbol, addon, textpos * scaler, addon_text_posn * scaler, 9.0 * scaler, textwidth * scaler, &last_string);
break;
}
break;
case 13: /* EAN 13 */
case 16:
case 19:
line = render_plot_create_line((0 + xoffset) * scaler, row_posn, scaler, 5.0 * scaler);
render_plot_add_line(symbol, line, &last_line);
line = render_plot_create_line((2 + xoffset) * scaler, row_posn, scaler, 5.0 * scaler);
render_plot_add_line(symbol, line, &last_line);
line = render_plot_create_line((46 + xoffset) * scaler, row_posn, scaler, 5.0 * scaler);
render_plot_add_line(symbol, line, &last_line);
line = render_plot_create_line((48 + xoffset) * scaler, row_posn, scaler, 5.0 * scaler);
render_plot_add_line(symbol, line, &last_line);
line = render_plot_create_line((92 + xoffset) * scaler, row_posn, scaler, 5.0 * scaler);
render_plot_add_line(symbol, line, &last_line);
line = render_plot_create_line((94 + xoffset) * scaler, row_posn, scaler, 5.0 * scaler);
render_plot_add_line(symbol, line, &last_line);
textpart[0] = symbol->text[0];
textpart[1] = '\0';
textpos = -5; // 7
textwidth = 7.0;
render_plot_add_string(symbol, textpart, (textpos + xoffset) * scaler, default_text_posn, 9.0 * scaler, textwidth * scaler, &last_string);
for(i = 0; i < 6; i++) {
textpart[i] = symbol->text[i + 1];
}
textpart[6] = '\0';
textpos = 25;
textwidth = 6.0 * 7.0;
render_plot_add_string(symbol, textpart, (textpos + xoffset) * scaler, default_text_posn, 9.0 * scaler, textwidth * scaler, &last_string);
for(i = 0; i < 6; i++) {
textpart[i] = symbol->text[i + 7];
}
textpart[6] = '\0';
textpos = 72;
render_plot_add_string(symbol, textpart, (textpos + xoffset) * scaler, default_text_posn, 9.0 * scaler, textwidth * scaler, &last_string);
textdone = 1;
switch(strlen(addon)) {
case 2:
textpos = xoffset + 114;
textwidth = 2.0 * 7.0;
render_plot_add_string(symbol, addon, textpos * scaler, addon_text_posn * scaler, 9.0 * scaler, textwidth * scaler, &last_string);
break;
case 5:
textpos = xoffset + 128;
textwidth = 5.0 * 7.0;
render_plot_add_string(symbol, addon, textpos * scaler, addon_text_posn * scaler, 9.0 * scaler, textwidth * scaler, &last_string);
break;
}
break;
}
}
/* Put normal human readable text at the bottom (and centered) */
if (textdone == 0) {
// caculate start xoffset to center text
render_plot_add_string(symbol, (char *) symbol->text, (symbol->width / 2.0) * scaler, default_text_posn, 9.0 * scaler, 0.0, &last_string);
}
}
if (locale)
setlocale(LC_ALL, locale);
return 1;
}
/*
* Create a new line with its memory allocated ready for adding to the
* rendered structure.
*
* This is much quicker than writing out each line manually (in some cases!)
*/
struct zint_render_line *render_plot_create_line(float x, float y, float width, float length)
{
struct zint_render_line *line;
line = malloc(sizeof(struct zint_render_line));
line->next = NULL;
line->x = x;
line->y = y;
line->width = width;
line->length = length;
return line;
}
/*
* Add the line to the current rendering and update the last line's
* next value.
*/
int render_plot_add_line(struct zint_symbol *symbol, struct zint_render_line *line, struct zint_render_line **last_line)
{
if (*last_line)
(*last_line)->next = line;
else
symbol->rendered->lines = line; // first line
*last_line = line;
return 1;
}
/*
* Add a string structure to the symbol.
* Coordinates assumed to be from top-center.
*/
int render_plot_add_string(struct zint_symbol *symbol,
char *text, float x, float y, float fsize, float width,
struct zint_render_string **last_string)
{
struct zint_render_string *string;
string = malloc(sizeof(struct zint_render_string));
string->next = NULL;
string->x = x;
string->y = y;
string->width = width;
string->fsize = fsize;
string->text = malloc(sizeof(char) * (ustrlen((unsigned char *) text) + 1));
strcpy(string->text, text);
if (*last_string)
(*last_string)->next = string;
else
symbol->rendered->strings = string; // First character
*last_string = string;
return 1;
}
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