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zint/backend/svg.c
gitlost 90293ebcda - Add text_gap option to allow adjustment of vertical gap between 
barcode and text
- EMF/EPS/SVG/GUI: ignore BOLD_TEXT for EAN/UPC
- DAFT: up max to 250 chars
- EMF/EPS/SVG: fix addon bars placement/length when text hidden
- Qt backend: use `QFontMetrics::horizontalAdvance()` rather than
  `boundingRect()` to calc text width (seems to be more accurate)
- library: make printf/sprintf() format arg always literal string
- output: fix errtxt nos clash;
  use array for `out_upcean_split_text()` text parts
- raster/vector: smallify addon text printing logic
- frontend: warn if output file and direct options both given;
  add TODO note about `CommandLineToArgvW()` loading shell32.dll
- manual: put HRT options in own section
2023-02-10 14:44:10 +00:00

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/* svg.c - Scalable Vector Graphics */
/*
libzint - the open source barcode library
Copyright (C) 2009-2023 Robin Stuart <rstuart114@gmail.com>
Redistribution and use in source and binary forms, with or without
modification, are permitted provided that the following conditions
are met:
1. Redistributions of source code must retain the above copyright
notice, this list of conditions and the following disclaimer.
2. Redistributions in binary form must reproduce the above copyright
notice, this list of conditions and the following disclaimer in the
documentation and/or other materials provided with the distribution.
3. Neither the name of the project nor the names of its contributors
may be used to endorse or promote products derived from this software
without specific prior written permission.
THIS SOFTWARE IS PROVIDED BY THE COPYRIGHT HOLDERS AND CONTRIBUTORS "AS IS" AND
ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE
IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE
ARE DISCLAIMED. IN NO EVENT SHALL THE COPYRIGHT OWNER OR CONTRIBUTORS BE LIABLE
FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL
DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS
OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION)
HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT
LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY
OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF
SUCH DAMAGE.
*/
/* SPDX-License-Identifier: BSD-3-Clause */
#include <errno.h>
#include <locale.h>
#include <math.h>
#include <stdio.h>
#include "common.h"
#include "output.h"
static void pick_colour(int colour, char colour_code[]) {
switch (colour) {
case 1: /* Cyan */
strcpy(colour_code, "00ffff");
break;
case 2: /* Blue */
strcpy(colour_code, "0000ff");
break;
case 3: /* Magenta */
strcpy(colour_code, "ff00ff");
break;
case 4: /* Red */
strcpy(colour_code, "ff0000");
break;
case 5: /* Yellow */
strcpy(colour_code, "ffff00");
break;
case 6: /* Green */
strcpy(colour_code, "00ff00");
break;
case 8: /* White */
strcpy(colour_code, "ffffff");
break;
default: /* Black */
strcpy(colour_code, "000000");
break;
}
}
static void make_html_friendly(unsigned char *string, char *html_version) {
/* Converts text to use HTML entity codes */
int i, len, html_pos;
html_pos = 0;
html_version[html_pos] = '\0';
len = (int) ustrlen(string);
for (i = 0; i < len; i++) {
switch (string[i]) {
case '>':
strcat(html_version, "&gt;");
html_pos += 4;
break;
case '<':
strcat(html_version, "&lt;");
html_pos += 4;
break;
case '&':
strcat(html_version, "&amp;");
html_pos += 5;
break;
case '"':
strcat(html_version, "&quot;");
html_pos += 6;
break;
case '\'':
strcat(html_version, "&apos;");
html_pos += 6;
break;
default:
html_version[html_pos] = string[i];
html_pos++;
html_version[html_pos] = '\0';
break;
}
}
}
INTERNAL int svg_plot(struct zint_symbol *symbol) {
static const char font_family[] = "Helvetica, sans-serif";
FILE *fsvg;
int error_number = 0;
const char *locale = NULL;
float ax, ay, bx, by, cx, cy, dx, dy, ex, ey, fx, fy;
float previous_diameter;
float radius, half_radius, half_sqrt3_radius;
int i;
char fgcolour_string[7];
char bgcolour_string[7];
unsigned char fgred, fggreen, fgblue, fg_alpha;
unsigned char bgred, bggreen, bgblue, bg_alpha;
float fg_alpha_opacity = 0.0f, bg_alpha_opacity = 0.0f; /* Suppress `-Wmaybe-uninitialized` */
int bold;
struct zint_vector_rect *rect;
struct zint_vector_hexagon *hex;
struct zint_vector_circle *circle;
struct zint_vector_string *string;
char colour_code[7];
int len, html_len;
const int output_to_stdout = symbol->output_options & BARCODE_STDOUT;
char *html_string;
(void) out_colour_get_rgb(symbol->fgcolour, &fgred, &fggreen, &fgblue, &fg_alpha);
if (fg_alpha != 0xff) {
fg_alpha_opacity = fg_alpha / 255.0f;
}
sprintf(fgcolour_string, "%02X%02X%02X", fgred, fggreen, fgblue);
(void) out_colour_get_rgb(symbol->bgcolour, &bgred, &bggreen, &bgblue, &bg_alpha);
if (bg_alpha != 0xff) {
bg_alpha_opacity = bg_alpha / 255.0f;
}
sprintf(bgcolour_string, "%02X%02X%02X", bgred, bggreen, bgblue);
len = (int) ustrlen(symbol->text);
html_len = len + 1;
for (i = 0; i < len; i++) {
switch (symbol->text[i]) {
case '>':
case '<':
case '"':
case '&':
case '\'':
html_len += 6;
break;
}
}
html_string = (char *) z_alloca(html_len);
/* Check for no created vector set */
/* E-Mail Christian Schmitz 2019-09-10: reason unknown Ticket #164*/
if (symbol->vector == NULL) {
strcpy(symbol->errtxt, "681: Vector header NULL");
return ZINT_ERROR_INVALID_DATA;
}
if (output_to_stdout) {
fsvg = stdout;
} else {
if (!(fsvg = out_fopen(symbol->outfile, "w"))) {
sprintf(symbol->errtxt, "680: Could not open output file (%d: %.30s)", errno, strerror(errno));
return ZINT_ERROR_FILE_ACCESS;
}
}
locale = setlocale(LC_ALL, "C");
/* Start writing the header */
fputs("<?xml version=\"1.0\" standalone=\"no\"?>\n"
"<!DOCTYPE svg PUBLIC \"-//W3C//DTD SVG 1.1//EN\"\n"
" \"http://www.w3.org/Graphics/SVG/1.1/DTD/svg11.dtd\">\n", fsvg);
fprintf(fsvg, "<svg width=\"%d\" height=\"%d\" version=\"1.1\"\n",
(int) ceilf(symbol->vector->width), (int) ceilf(symbol->vector->height));
fputs(" xmlns=\"http://www.w3.org/2000/svg\">\n"
" <desc>Zint Generated Symbol\n"
" </desc>\n", fsvg);
fprintf(fsvg, "\n <g id=\"barcode\" fill=\"#%s\">\n", fgcolour_string);
if (bg_alpha != 0) {
fprintf(fsvg, " <rect x=\"0\" y=\"0\" width=\"%d\" height=\"%d\" fill=\"#%s\"",
(int) ceilf(symbol->vector->width), (int) ceilf(symbol->vector->height), bgcolour_string);
if (bg_alpha != 0xff) {
fprintf(fsvg, " opacity=\"%.3f\"", bg_alpha_opacity);
}
fputs(" />\n", fsvg);
}
rect = symbol->vector->rectangles;
while (rect) {
fprintf(fsvg, " <rect x=\"%.2f\" y=\"%.2f\" width=\"%.2f\" height=\"%.2f\"",
rect->x, rect->y, rect->width, rect->height);
if (rect->colour != -1) {
pick_colour(rect->colour, colour_code);
fprintf(fsvg, " fill=\"#%s\"", colour_code);
}
if (fg_alpha != 0xff) {
fprintf(fsvg, " opacity=\"%.3f\"", fg_alpha_opacity);
}
fputs(" />\n", fsvg);
rect = rect->next;
}
previous_diameter = radius = half_radius = half_sqrt3_radius = 0.0f;
hex = symbol->vector->hexagons;
while (hex) {
if (previous_diameter != hex->diameter) {
previous_diameter = hex->diameter;
radius = (float) (0.5 * previous_diameter);
half_radius = (float) (0.25 * previous_diameter);
half_sqrt3_radius = (float) (0.43301270189221932338 * previous_diameter);
}
if ((hex->rotation == 0) || (hex->rotation == 180)) {
ay = hex->y + radius;
by = hex->y + half_radius;
cy = hex->y - half_radius;
dy = hex->y - radius;
ey = hex->y - half_radius;
fy = hex->y + half_radius;
ax = hex->x;
bx = hex->x + half_sqrt3_radius;
cx = hex->x + half_sqrt3_radius;
dx = hex->x;
ex = hex->x - half_sqrt3_radius;
fx = hex->x - half_sqrt3_radius;
} else {
ay = hex->y;
by = hex->y + half_sqrt3_radius;
cy = hex->y + half_sqrt3_radius;
dy = hex->y;
ey = hex->y - half_sqrt3_radius;
fy = hex->y - half_sqrt3_radius;
ax = hex->x - radius;
bx = hex->x - half_radius;
cx = hex->x + half_radius;
dx = hex->x + radius;
ex = hex->x + half_radius;
fx = hex->x - half_radius;
}
fprintf(fsvg, " <path d=\"M %.2f %.2f L %.2f %.2f L %.2f %.2f L %.2f %.2f L %.2f %.2f L %.2f %.2f Z\"",
ax, ay, bx, by, cx, cy, dx, dy, ex, ey, fx, fy);
if (fg_alpha != 0xff) {
fprintf(fsvg, " opacity=\"%.3f\"", fg_alpha_opacity);
}
fputs(" />\n", fsvg);
hex = hex->next;
}
previous_diameter = radius = 0.0f;
circle = symbol->vector->circles;
while (circle) {
if (previous_diameter != circle->diameter) {
previous_diameter = circle->diameter;
radius = (float) (0.5 * previous_diameter);
}
fprintf(fsvg, " <circle cx=\"%.2f\" cy=\"%.2f\" r=\"%.*f\"",
circle->x, circle->y, circle->width ? 3 : 2, radius);
if (circle->colour) { /* Legacy - no longer used */
if (circle->width) {
fprintf(fsvg, " stroke=\"#%s\" stroke-width=\"%.3f\" fill=\"none\"", bgcolour_string, circle->width);
} else {
fprintf(fsvg, " fill=\"#%s\"", bgcolour_string);
}
if (bg_alpha != 0xff) {
/* This doesn't work how the user is likely to expect - more work needed! */
fprintf(fsvg, " opacity=\"%.3f\"", bg_alpha_opacity);
}
} else {
if (circle->width) {
fprintf(fsvg, " stroke=\"#%s\" stroke-width=\"%.3f\" fill=\"none\"", fgcolour_string, circle->width);
}
if (fg_alpha != 0xff) {
fprintf(fsvg, " opacity=\"%.3f\"", fg_alpha_opacity);
}
}
fputs(" />\n", fsvg);
circle = circle->next;
}
bold = (symbol->output_options & BOLD_TEXT) && !is_extendable(symbol->symbology);
string = symbol->vector->strings;
while (string) {
const char *const halign = string->halign == 2 ? "end" : string->halign == 1 ? "start" : "middle";
fprintf(fsvg, " <text x=\"%.2f\" y=\"%.2f\" text-anchor=\"%s\"\n", string->x, string->y, halign);
fprintf(fsvg, " font-family=\"%s\" font-size=\"%.1f\"", font_family, string->fsize);
if (bold) {
fputs(" font-weight=\"bold\"", fsvg);
}
if (fg_alpha != 0xff) {
fprintf(fsvg, " opacity=\"%.3f\"", fg_alpha_opacity);
}
if (string->rotation != 0) {
fprintf(fsvg, " transform=\"rotate(%d,%.2f,%.2f)\"", string->rotation, string->x, string->y);
}
fputs(" >\n", fsvg);
make_html_friendly(string->text, html_string);
fprintf(fsvg, " %s\n", html_string);
fputs(" </text>\n", fsvg);
string = string->next;
}
fputs(" </g>\n"
"</svg>\n", fsvg);
if (locale)
setlocale(LC_ALL, locale);
if (ferror(fsvg)) {
sprintf(symbol->errtxt, "682: Incomplete write to output (%d: %.30s)", errno, strerror(errno));
if (!output_to_stdout) {
(void) fclose(fsvg);
}
return ZINT_ERROR_FILE_WRITE;
}
if (output_to_stdout) {
if (fflush(fsvg) != 0) {
sprintf(symbol->errtxt, "683: Incomplete flush to output (%d: %.30s)", errno, strerror(errno));
return ZINT_ERROR_FILE_WRITE;
}
} else {
if (fclose(fsvg) != 0) {
sprintf(symbol->errtxt, "684: Failure on closing output file (%d: %.30s)", errno, strerror(errno));
return ZINT_ERROR_FILE_WRITE;
}
}
return error_number;
}
/* vim: set ts=4 sw=4 et : */
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