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930f458979
replace double-slash comments with old-skool slash asterisk ones; define uint16_t etc for Windows ourselves and remove ms_stdint.h & stdint_msvc.h as no longer used; (backend (excepting test suite) now C89 compatible) LICENSE: move from backend to root and move COPYING to frontend, with copies in frontend_qt & backend_qt, so in where it applies; add LICENSE section from manual to root README
345 lines
12 KiB
C
345 lines
12 KiB
C
/* svg.c - Scalable Vector Graphics */
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/*
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libzint - the open source barcode library
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Copyright (C) 2009-2022 Robin Stuart <rstuart114@gmail.com>
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Redistribution and use in source and binary forms, with or without
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modification, are permitted provided that the following conditions
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are met:
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1. Redistributions of source code must retain the above copyright
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notice, this list of conditions and the following disclaimer.
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2. Redistributions in binary form must reproduce the above copyright
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notice, this list of conditions and the following disclaimer in the
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documentation and/or other materials provided with the distribution.
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3. Neither the name of the project nor the names of its contributors
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may be used to endorse or promote products derived from this software
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without specific prior written permission.
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THIS SOFTWARE IS PROVIDED BY THE COPYRIGHT HOLDERS AND CONTRIBUTORS "AS IS" AND
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ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE
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IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE
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ARE DISCLAIMED. IN NO EVENT SHALL THE COPYRIGHT OWNER OR CONTRIBUTORS BE LIABLE
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FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL
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DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS
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OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION)
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HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT
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LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY
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OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF
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SUCH DAMAGE.
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*/
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/* SPDX-License-Identifier: BSD-3-Clause */
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#include <errno.h>
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#include <locale.h>
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#include <math.h>
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#include <stdio.h>
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#include "common.h"
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static void pick_colour(int colour, char colour_code[]) {
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switch (colour) {
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case 1: /* Cyan */
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strcpy(colour_code, "00ffff");
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break;
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case 2: /* Blue */
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strcpy(colour_code, "0000ff");
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break;
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case 3: /* Magenta */
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strcpy(colour_code, "ff00ff");
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break;
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case 4: /* Red */
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strcpy(colour_code, "ff0000");
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break;
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case 5: /* Yellow */
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strcpy(colour_code, "ffff00");
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break;
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case 6: /* Green */
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strcpy(colour_code, "00ff00");
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break;
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case 8: /* White */
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strcpy(colour_code, "ffffff");
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break;
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default: /* Black */
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strcpy(colour_code, "000000");
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break;
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}
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}
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static void make_html_friendly(unsigned char *string, char *html_version) {
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/* Converts text to use HTML entity codes */
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int i, len, html_pos;
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html_pos = 0;
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html_version[html_pos] = '\0';
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len = (int) ustrlen(string);
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for (i = 0; i < len; i++) {
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switch (string[i]) {
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case '>':
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strcat(html_version, ">");
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html_pos += 4;
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break;
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case '<':
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strcat(html_version, "<");
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html_pos += 4;
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break;
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case '&':
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strcat(html_version, "&");
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html_pos += 5;
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break;
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case '"':
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strcat(html_version, """);
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html_pos += 6;
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break;
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case '\'':
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strcat(html_version, "'");
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html_pos += 6;
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break;
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default:
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html_version[html_pos] = string[i];
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html_pos++;
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html_version[html_pos] = '\0';
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break;
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}
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}
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}
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INTERNAL int svg_plot(struct zint_symbol *symbol) {
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FILE *fsvg;
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int error_number = 0;
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const char *locale = NULL;
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float ax, ay, bx, by, cx, cy, dx, dy, ex, ey, fx, fy;
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float previous_diameter;
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float radius, half_radius, half_sqrt3_radius;
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int i;
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char fgcolour_string[7];
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char bgcolour_string[7];
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int bg_alpha = 0xff;
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int fg_alpha = 0xff;
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float fg_alpha_opacity = 0.0f, bg_alpha_opacity = 0.0f;
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const char font_family[] = "Helvetica, sans-serif";
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int bold;
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struct zint_vector_rect *rect;
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struct zint_vector_hexagon *hex;
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struct zint_vector_circle *circle;
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struct zint_vector_string *string;
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char colour_code[7];
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int len, html_len;
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char *html_string;
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for (i = 0; i < 6; i++) {
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fgcolour_string[i] = symbol->fgcolour[i];
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bgcolour_string[i] = symbol->bgcolour[i];
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}
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fgcolour_string[6] = '\0';
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bgcolour_string[6] = '\0';
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if (strlen(symbol->fgcolour) > 6) {
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fg_alpha = (16 * ctoi(symbol->fgcolour[6])) + ctoi(symbol->fgcolour[7]);
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if (fg_alpha != 0xff) {
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fg_alpha_opacity = (float) (fg_alpha / 255.0);
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}
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}
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if (strlen(symbol->bgcolour) > 6) {
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bg_alpha = (16 * ctoi(symbol->bgcolour[6])) + ctoi(symbol->bgcolour[7]);
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if (bg_alpha != 0xff) {
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bg_alpha_opacity = (float) (bg_alpha / 255.0);
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}
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}
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len = (int) ustrlen(symbol->text);
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html_len = len + 1;
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for (i = 0; i < len; i++) {
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switch (symbol->text[i]) {
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case '>':
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case '<':
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case '"':
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case '&':
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case '\'':
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html_len += 6;
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break;
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}
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}
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html_string = (char *) z_alloca(html_len);
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/* Check for no created vector set */
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/* E-Mail Christian Schmitz 2019-09-10: reason unknown Ticket #164*/
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if (symbol->vector == NULL) {
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strcpy(symbol->errtxt, "681: Vector header NULL");
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return ZINT_ERROR_INVALID_DATA;
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}
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if (symbol->output_options & BARCODE_STDOUT) {
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fsvg = stdout;
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} else {
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if (!(fsvg = fopen(symbol->outfile, "w"))) {
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sprintf(symbol->errtxt, "680: Could not open output file (%d: %.30s)", errno, strerror(errno));
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return ZINT_ERROR_FILE_ACCESS;
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}
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}
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locale = setlocale(LC_ALL, "C");
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/* Start writing the header */
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fprintf(fsvg, "<?xml version=\"1.0\" standalone=\"no\"?>\n");
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fprintf(fsvg, "<!DOCTYPE svg PUBLIC \"-//W3C//DTD SVG 1.1//EN\"\n");
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fprintf(fsvg, " \"http://www.w3.org/Graphics/SVG/1.1/DTD/svg11.dtd\">\n");
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fprintf(fsvg, "<svg width=\"%d\" height=\"%d\" version=\"1.1\"\n",
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(int) ceilf(symbol->vector->width), (int) ceilf(symbol->vector->height));
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fprintf(fsvg, " xmlns=\"http://www.w3.org/2000/svg\">\n");
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fprintf(fsvg, " <desc>Zint Generated Symbol\n");
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fprintf(fsvg, " </desc>\n");
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fprintf(fsvg, "\n <g id=\"barcode\" fill=\"#%s\">\n", fgcolour_string);
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if (bg_alpha != 0) {
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fprintf(fsvg, " <rect x=\"0\" y=\"0\" width=\"%d\" height=\"%d\" fill=\"#%s\"",
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(int) ceilf(symbol->vector->width), (int) ceilf(symbol->vector->height), bgcolour_string);
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if (bg_alpha != 0xff) {
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fprintf(fsvg, " opacity=\"%.3f\"", bg_alpha_opacity);
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}
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fprintf(fsvg, " />\n");
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}
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rect = symbol->vector->rectangles;
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while (rect) {
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fprintf(fsvg, " <rect x=\"%.2f\" y=\"%.2f\" width=\"%.2f\" height=\"%.2f\"",
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rect->x, rect->y, rect->width, rect->height);
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if (rect->colour != -1) {
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pick_colour(rect->colour, colour_code);
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fprintf(fsvg, " fill=\"#%s\"", colour_code);
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}
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if (fg_alpha != 0xff) {
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fprintf(fsvg, " opacity=\"%.3f\"", fg_alpha_opacity);
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}
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fprintf(fsvg, " />\n");
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rect = rect->next;
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}
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previous_diameter = radius = half_radius = half_sqrt3_radius = 0.0f;
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hex = symbol->vector->hexagons;
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while (hex) {
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if (previous_diameter != hex->diameter) {
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previous_diameter = hex->diameter;
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radius = (float) (0.5 * previous_diameter);
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half_radius = (float) (0.25 * previous_diameter);
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half_sqrt3_radius = (float) (0.43301270189221932338 * previous_diameter);
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}
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if ((hex->rotation == 0) || (hex->rotation == 180)) {
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ay = hex->y + radius;
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by = hex->y + half_radius;
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cy = hex->y - half_radius;
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dy = hex->y - radius;
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ey = hex->y - half_radius;
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fy = hex->y + half_radius;
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ax = hex->x;
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bx = hex->x + half_sqrt3_radius;
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cx = hex->x + half_sqrt3_radius;
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dx = hex->x;
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ex = hex->x - half_sqrt3_radius;
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fx = hex->x - half_sqrt3_radius;
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} else {
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ay = hex->y;
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by = hex->y + half_sqrt3_radius;
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cy = hex->y + half_sqrt3_radius;
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dy = hex->y;
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ey = hex->y - half_sqrt3_radius;
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fy = hex->y - half_sqrt3_radius;
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ax = hex->x - radius;
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bx = hex->x - half_radius;
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cx = hex->x + half_radius;
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dx = hex->x + radius;
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ex = hex->x + half_radius;
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fx = hex->x - half_radius;
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}
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fprintf(fsvg, " <path d=\"M %.2f %.2f L %.2f %.2f L %.2f %.2f L %.2f %.2f L %.2f %.2f L %.2f %.2f Z\"",
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ax, ay, bx, by, cx, cy, dx, dy, ex, ey, fx, fy);
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if (fg_alpha != 0xff) {
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fprintf(fsvg, " opacity=\"%.3f\"", fg_alpha_opacity);
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}
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fprintf(fsvg, " />\n");
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hex = hex->next;
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}
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previous_diameter = radius = 0.0f;
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circle = symbol->vector->circles;
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while (circle) {
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if (previous_diameter != circle->diameter) {
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previous_diameter = circle->diameter;
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radius = (float) (0.5 * previous_diameter);
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}
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fprintf(fsvg, " <circle cx=\"%.2f\" cy=\"%.2f\" r=\"%.*f\"",
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circle->x, circle->y, circle->width ? 3 : 2, radius);
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if (circle->colour) {
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if (circle->width) {
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fprintf(fsvg, " stroke=\"#%s\" stroke-width=\"%.3f\" fill=\"none\"", bgcolour_string, circle->width);
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} else {
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fprintf(fsvg, " fill=\"#%s\"", bgcolour_string);
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}
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if (bg_alpha != 0xff) {
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/* This doesn't work how the user is likely to expect - more work needed! */
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fprintf(fsvg, " opacity=\"%.3f\"", bg_alpha_opacity);
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}
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} else {
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if (circle->width) {
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fprintf(fsvg, " stroke=\"#%s\" stroke-width=\"%.3f\" fill=\"none\"", fgcolour_string, circle->width);
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}
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if (fg_alpha != 0xff) {
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fprintf(fsvg, " opacity=\"%.3f\"", fg_alpha_opacity);
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}
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}
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fprintf(fsvg, " />\n");
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circle = circle->next;
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}
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bold = (symbol->output_options & BOLD_TEXT)
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&& (!is_extendable(symbol->symbology) || (symbol->output_options & SMALL_TEXT));
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string = symbol->vector->strings;
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while (string) {
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const char *const halign = string->halign == 2 ? "end" : string->halign == 1 ? "start" : "middle";
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fprintf(fsvg, " <text x=\"%.2f\" y=\"%.2f\" text-anchor=\"%s\"\n", string->x, string->y, halign);
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fprintf(fsvg, " font-family=\"%s\" font-size=\"%.1f\"", font_family, string->fsize);
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if (bold) {
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fprintf(fsvg, " font-weight=\"bold\"");
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}
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if (fg_alpha != 0xff) {
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fprintf(fsvg, " opacity=\"%.3f\"", fg_alpha_opacity);
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}
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if (string->rotation != 0) {
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fprintf(fsvg, " transform=\"rotate(%d,%.2f,%.2f)\"", string->rotation, string->x, string->y);
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}
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fprintf(fsvg, " >\n");
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make_html_friendly(string->text, html_string);
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fprintf(fsvg, " %s\n", html_string);
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fprintf(fsvg, " </text>\n");
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string = string->next;
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}
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fprintf(fsvg, " </g>\n");
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fprintf(fsvg, "</svg>\n");
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if (symbol->output_options & BARCODE_STDOUT) {
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fflush(fsvg);
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} else {
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fclose(fsvg);
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}
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if (locale)
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setlocale(LC_ALL, locale);
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return error_number;
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}
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/* vim: set ts=4 sw=4 et : */
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