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zint/backend/svg.c
gitlost fab7435fac Performance improvements for linear encoding and raster output 
- use fixed-length string tables (mostly) instead of (char *) pointer ones
   (saves ~40K)
 - re-use C128Table for CODABLOCKF and CODE16K
   (required removal of Stop character and extra CODE16K-only entry)
 - use pointer to destination and copy (memcpy/strcpy(), bin_append_posn())
   instead of concatenating (strcat()) (mostly)
 - replace last remaining bin_append()s with bin_append_posn();
   bin_append() removed
 - add length arg to toupper() and expand() (avoids strlen())
 - change is_sane() to use table-based flags (avoids an iteration)
 - rename lookup() to is_sane_lookup() and change to check and return posns
   and use in pointer to destination loops (avoids strcat()s)
 - remove special case PHARMA in expand() (dealt with in pharma())
 - make #define SILVER/CALCIUM/TECHNETIUM/KRSET etc static strings
 - replace strchr() -> posn()
 - CODE128: populate destination once in checksum loop; re-use and export
   some more routines (c128_set_a/b/c(), c128_put_in_set()) for sharing;
   prefix defines (SHIFTA -> C128_SHIFTA etc) and existing exported routines
 - use factor XOR toggle trick in checksum calcs (avoids branch)
 - raster.c: fill out single 1-pixel row and copy using new draw_bar_line(),
   copy_bar_line() routines; similarly in buffer_plot compare previous line &
   copy if same (same technique as used to improve non-half-integer scaling,
   significant performance increase, (c) codemonkey82);
   also done for PNG (BMP/GIF/PCX/TIFF not done)
 - raster/vector/output.c: shorten "output_" prefix -> "out_";
   sync vector to other raster changes to try to keep source files similar
 - 2of5.c: prefix "c25_"
JAPANPOST: return error if input data truncated (backward incompatible)
DAFT: max chars 50 -> 100
common.c: istwodigit() -> is_twodigit()
common.c/emf.c/output.c: use some further stripf()s (MSVC6 float variations)
library.c: new check_output_args() helper
zint.h: add BARCODE_LAST marker and use in library.c
QRCODE: remove a NOLINT (requires clang-tidy-13), one remaining
CMake: separate no-optimize from ZINT_DEBUG into new ZINT_NOOPT option
2021-10-20 23:05:30 +01:00

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/* svg.c - Scalable Vector Graphics */
/*
libzint - the open source barcode library
Copyright (C) 2009 - 2021 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.
*/
/* vim: set ts=4 sw=4 et : */
#include <errno.h>
#include <locale.h>
#include <stdio.h>
#include <math.h>
#ifdef _MSC_VER
#include <malloc.h>
#endif
#include "common.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) {
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];
int bg_alpha = 0xff;
int fg_alpha = 0xff;
float fg_alpha_opacity = 0.0f, bg_alpha_opacity = 0.0f;
const char font_family[] = "Helvetica, sans-serif";
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;
#ifdef _MSC_VER
char *html_string;
#endif
for (i = 0; i < 6; i++) {
fgcolour_string[i] = symbol->fgcolour[i];
bgcolour_string[i] = symbol->bgcolour[i];
}
fgcolour_string[6] = '\0';
bgcolour_string[6] = '\0';
if (strlen(symbol->fgcolour) > 6) {
fg_alpha = (16 * ctoi(symbol->fgcolour[6])) + ctoi(symbol->fgcolour[7]);
if (fg_alpha != 0xff) {
fg_alpha_opacity = (float) (fg_alpha / 255.0);
}
}
if (strlen(symbol->bgcolour) > 6) {
bg_alpha = (16 * ctoi(symbol->bgcolour[6])) + ctoi(symbol->bgcolour[7]);
if (bg_alpha != 0xff) {
bg_alpha_opacity = (float) (bg_alpha / 255.0);
}
}
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;
}
}
#ifndef _MSC_VER
char html_string[html_len];
#else
html_string = (char *) _alloca(html_len);
#endif
/* 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 (symbol->output_options & BARCODE_STDOUT) {
fsvg = stdout;
} else {
if (!(fsvg = 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 */
fprintf(fsvg, "<?xml version=\"1.0\" standalone=\"no\"?>\n");
fprintf(fsvg, "<!DOCTYPE svg PUBLIC \"-//W3C//DTD SVG 1.1//EN\"\n");
fprintf(fsvg, " \"http://www.w3.org/Graphics/SVG/1.1/DTD/svg11.dtd\">\n");
fprintf(fsvg, "<svg width=\"%d\" height=\"%d\" version=\"1.1\"\n",
(int) ceilf(symbol->vector->width), (int) ceilf(symbol->vector->height));
fprintf(fsvg, " xmlns=\"http://www.w3.org/2000/svg\">\n");
fprintf(fsvg, " <desc>Zint Generated Symbol\n");
fprintf(fsvg, " </desc>\n");
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);
}
fprintf(fsvg, " />\n");
}
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);
}
fprintf(fsvg, " />\n");
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);
}
fprintf(fsvg, " />\n");
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) {
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);
}
}
fprintf(fsvg, " />\n");
circle = circle->next;
}
bold = (symbol->output_options & BOLD_TEXT)
&& (!is_extendable(symbol->symbology) || (symbol->output_options & SMALL_TEXT));
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) {
fprintf(fsvg, " font-weight=\"bold\"");
}
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);
}
fprintf(fsvg, " >\n");
make_html_friendly(string->text, html_string);
fprintf(fsvg, " %s\n", html_string);
fprintf(fsvg, " </text>\n");
string = string->next;
}
fprintf(fsvg, " </g>\n");
fprintf(fsvg, "</svg>\n");
if (symbol->output_options & BARCODE_STDOUT) {
fflush(fsvg);
} else {
fclose(fsvg);
}
if (locale)
setlocale(LC_ALL, locale);
return error_number;
}
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