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mirror of https://github.com/woo-j/zint.git synced 2024-12-23 13:33:55 +03:00
zint/backend/svg.c
gitlost 5e2044ff2e CODE128: reduce extended latch cut-off from 5 to 4 for better
encodation in certain cases (and no pessimizations found so far),
  props lyngklip (BWIPP);
  fix extended char latching when exactly 3 extended chars at end;
  count code set C (not digits) in loop deciding when to
  shift/latch to extended for better estimate
AZTEC: return warning if ECC < 5% (due to bit-stuffing when version
  given); return error if > 22 layers (Zint 26) for Reader
  Initialisation symbol requested for better error message
AZTEC/HANXIN/QRCODE: consolidate different ECC data size tables
  into one indexed by ECC
DBAR_EXP: check for reduced length <= 77 up front for better error
  message
HANXIN: use `malloc()` rather than `z_alloca()` for large binary
  array
QRCODE: `ecc_level` now 0-based (not 1-based)
MICROQR: consolidate different version end routines into one
  `microqr_end()` and use new `microqr_data` table to simplify code
MICROPDF417: use table for max codewords per column
library: centralize all error messages using new `errtxt()`,
  `errtxtf()`, `errtxt_adj()` funcs that protect `symbol->errtxt`
  from overflow, & try to make error messages more consistent
  thru-out, adding more feedback info to many, & use positional
  args "%n$" in prep for l10n (maybe);
  `is_sane/is_sane_lookup()` -> `not_sane/not_sane_lookup()`,
  returning 1-based position (zero on failure) instead of bool;
  `long` ints -> plain `int` (except those dealing with `ftell()`,
  `fread()` etc) as depend on int being 32-bits already
GUI: in "grpDATF.ui" use "PlainText" rather than "RichText" for
  tracker ratio examples as height of text messing up sometimes
manual: clarify Codablock-F length maximum & add examples
docs: README: pandoc 3.5, Ubuntu 24.04
CMake: use "-Wpedantic" for Clang only as GNU complains about
  `errtxtf()` positional args "%n$"
2024-10-27 21:33:33 +00:00

361 lines
14 KiB
C

/* svg.c - Scalable Vector Graphics */
/*
libzint - the open source barcode library
Copyright (C) 2009-2024 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 <math.h>
#include <stdio.h>
#include "common.h"
#include "filemem.h"
#include "output.h"
#include "fonts/normal_woff2.h"
#include "fonts/upcean_woff2.h"
/* Convert Ultracode rectangle colour to RGB */
static void svg_pick_colour(const int colour, char colour_code[7]) {
const int idx = colour >= 1 && colour <= 8 ? colour - 1 : 6 /*black*/;
static const char rgbs[8][7] = {
"00ffff", /* 0: Cyan (1) */
"0000ff", /* 1: Blue (2) */
"ff00ff", /* 2: Magenta (3) */
"ff0000", /* 3: Red (4) */
"ffff00", /* 4: Yellow (5) */
"00ff00", /* 5: Green (6) */
"000000", /* 6: Black (7) */
"ffffff", /* 7: White (8) */
};
strcpy(colour_code, rgbs[idx]);
}
/* Convert text to use HTML entity codes */
static void svg_make_html_friendly(const unsigned char *string, char *html_version) {
for (; *string; string++) {
switch (*string) {
case '>':
strcpy(html_version, "&gt;");
html_version += 4;
break;
case '<':
strcpy(html_version, "&lt;");
html_version += 4;
break;
case '&':
strcpy(html_version, "&amp;");
html_version += 5;
break;
case '"':
strcpy(html_version, "&quot;");
html_version += 6;
break;
case '\'':
strcpy(html_version, "&apos;");
html_version += 6;
break;
default:
*html_version++ = *string;
break;
}
}
*html_version = '\0';
}
/* Helper to output floating point attribute */
static void svg_put_fattrib(const char *prefix, const int dp, const float val, struct filemem *fmp) {
fm_putsf(prefix, dp, val, fmp);
fm_putc('"', fmp);
}
/* Helper to output opacity attribute attribute and close tag (maybe) */
static void svg_put_opacity_close(const unsigned char alpha, const float val, const int close, struct filemem *fmp) {
if (alpha != 0xff) {
svg_put_fattrib(" opacity=\"", 3, val, fmp);
}
if (close) {
fm_putc('/', fmp);
}
fm_puts(">\n", fmp);
}
INTERNAL int svg_plot(struct zint_symbol *symbol) {
static const char normal_font_family[] = "Arimo";
static const char upcean_font_family[] = "OCRB";
struct filemem fm;
struct filemem *const fmp = &fm;
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 upcean = is_upcean(symbol->symbology);
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;
}
}
if (symbol->output_options & EANUPC_GUARD_WHITESPACE) {
html_len += 12; /* Allow for "<" & ">" */
}
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) {
return errtxt(ZINT_ERROR_INVALID_DATA, symbol, 681, "Vector header NULL");
}
if (!fm_open(fmp, symbol, "w")) {
return errtxtf(ZINT_ERROR_FILE_ACCESS, symbol, 680, "Could not open SVG output file (%1$d: %2$s)", fmp->err,
strerror(fmp->err));
}
/* Start writing the header */
fm_puts("<?xml version=\"1.0\" standalone=\"no\"?>\n"
"<!DOCTYPE svg PUBLIC \"-//W3C//DTD SVG 1.1//EN\" \"http://www.w3.org/Graphics/SVG/1.1/DTD/svg11.dtd\">\n",
fmp);
fm_printf(fmp, "<svg width=\"%d\" height=\"%d\" version=\"1.1\" xmlns=\"http://www.w3.org/2000/svg\">\n",
(int) ceilf(symbol->vector->width), (int) ceilf(symbol->vector->height));
fm_puts(" <desc>Zint Generated Symbol</desc>\n", fmp);
if ((symbol->output_options & EMBED_VECTOR_FONT) && symbol->vector->strings) {
/* Split into `puts()` rather than one very large `printf()` */
fm_printf(fmp, " <style>@font-face {font-family:\"%s\"; src:url(data:font/woff2;base64,",
upcean ? "OCRB" : "Arimo");
fm_puts(upcean ? upcean_woff2 : normal_woff2, fmp);
fm_puts(");}</style>\n", fmp);
}
fm_printf(fmp, " <g id=\"barcode\" fill=\"#%s\">\n", fgcolour_string);
if (bg_alpha != 0) {
fm_printf(fmp, " <rect x=\"0\" y=\"0\" width=\"%d\" height=\"%d\" fill=\"#%s\"",
(int) ceilf(symbol->vector->width), (int) ceilf(symbol->vector->height), bgcolour_string);
svg_put_opacity_close(bg_alpha, bg_alpha_opacity, 1 /*close*/, fmp);
}
if (symbol->vector->rectangles) {
int current_colour = 0;
rect = symbol->vector->rectangles;
fm_puts(" <path d=\"", fmp);
while (rect) {
if (current_colour && rect->colour != current_colour) {
fm_putc('"', fmp);
if (current_colour != -1) {
svg_pick_colour(current_colour, colour_code);
fm_printf(fmp, " fill=\"#%s\"", colour_code);
}
svg_put_opacity_close(fg_alpha, fg_alpha_opacity, 1 /*close*/, fmp);
fm_puts(" <path d=\"", fmp);
}
current_colour = rect->colour;
fm_putsf("M", 2, rect->x, fmp);
fm_putsf(" ", 2, rect->y, fmp);
fm_putsf("h", 2, rect->width, fmp);
fm_putsf("v", 2, rect->height, fmp);
fm_putsf("h-", 2, rect->width, fmp);
fm_puts("Z", fmp);
rect = rect->next;
}
fm_putc('"', fmp);
if (current_colour != -1) {
svg_pick_colour(current_colour, colour_code);
fm_printf(fmp, " fill=\"#%s\"", colour_code);
}
svg_put_opacity_close(fg_alpha, fg_alpha_opacity, 1 /*close*/, fmp);
}
if (symbol->vector->hexagons) {
previous_diameter = radius = half_radius = half_sqrt3_radius = 0.0f;
hex = symbol->vector->hexagons;
fm_puts(" <path d=\"", fmp);
while (hex) {
if (previous_diameter != hex->diameter) {
previous_diameter = hex->diameter;
radius = 0.5f * previous_diameter;
half_radius = 0.25f * previous_diameter;
half_sqrt3_radius = 0.43301270189221932338f * previous_diameter;
}
if ((hex->rotation == 0) || (hex->rotation == 180)) {
fm_putsf("M", 2, hex->x, fmp);
fm_putsf(" ", 2, hex->y + radius, fmp);
fm_putsf("L", 2, hex->x + half_sqrt3_radius, fmp);
fm_putsf(" ", 2, hex->y + half_radius, fmp);
fm_putsf("L", 2, hex->x + half_sqrt3_radius, fmp);
fm_putsf(" ", 2, hex->y - half_radius, fmp);
fm_putsf("L", 2, hex->x, fmp);
fm_putsf(" ", 2, hex->y - radius, fmp);
fm_putsf("L", 2, hex->x - half_sqrt3_radius, fmp);
fm_putsf(" ", 2, hex->y - half_radius, fmp);
fm_putsf("L", 2, hex->x - half_sqrt3_radius, fmp);
fm_putsf(" ", 2, hex->y + half_radius, fmp);
} else {
fm_putsf("M", 2, hex->x - radius, fmp);
fm_putsf(" ", 2, hex->y, fmp);
fm_putsf("L", 2, hex->x - half_radius, fmp);
fm_putsf(" ", 2, hex->y + half_sqrt3_radius, fmp);
fm_putsf("L", 2, hex->x + half_radius, fmp);
fm_putsf(" ", 2, hex->y + half_sqrt3_radius, fmp);
fm_putsf("L", 2, hex->x + radius, fmp);
fm_putsf(" ", 2, hex->y, fmp);
fm_putsf("L", 2, hex->x + half_radius, fmp);
fm_putsf(" ", 2, hex->y - half_sqrt3_radius, fmp);
fm_putsf("L", 2, hex->x - half_radius, fmp);
fm_putsf(" ", 2, hex->y - half_sqrt3_radius, fmp);
}
fm_putc('Z', fmp);
hex = hex->next;
}
fm_putc('"', fmp);
svg_put_opacity_close(fg_alpha, fg_alpha_opacity, 1 /*close*/, fmp);
}
previous_diameter = radius = 0.0f;
circle = symbol->vector->circles;
while (circle) {
if (previous_diameter != circle->diameter) {
previous_diameter = circle->diameter;
radius = 0.5f * previous_diameter;
}
fm_puts(" <circle", fmp);
svg_put_fattrib(" cx=\"", 2, circle->x, fmp);
svg_put_fattrib(" cy=\"", 2, circle->y, fmp);
svg_put_fattrib(" r=\"", circle->width ? 3 : 2, radius, fmp);
if (circle->colour) { /* Legacy - no longer used */
if (circle->width) {
fm_printf(fmp, " stroke=\"#%s\"", bgcolour_string);
svg_put_fattrib(" stroke-width=\"", 3, circle->width, fmp);
fm_puts(" fill=\"none\"", fmp);
} else {
fm_printf(fmp, " fill=\"#%s\"", bgcolour_string);
}
/* This doesn't work how the user is likely to expect - more work needed! */
svg_put_opacity_close(bg_alpha, bg_alpha_opacity, 1 /*close*/, fmp);
} else {
if (circle->width) {
fm_printf(fmp, " stroke=\"#%s\"", fgcolour_string);
svg_put_fattrib(" stroke-width=\"", 3, circle->width, fmp);
fm_puts(" fill=\"none\"", fmp);
}
svg_put_opacity_close(fg_alpha, fg_alpha_opacity, 1 /*close*/, fmp);
}
circle = circle->next;
}
bold = (symbol->output_options & BOLD_TEXT) && !upcean;
string = symbol->vector->strings;
while (string) {
const char *const halign = string->halign == 2 ? "end" : string->halign == 1 ? "start" : "middle";
fm_puts(" <text", fmp);
svg_put_fattrib(" x=\"", 2, string->x, fmp);
svg_put_fattrib(" y=\"", 2, string->y, fmp);
fm_printf(fmp, " text-anchor=\"%s\"", halign);
if (upcean) {
fm_printf(fmp, " font-family=\"%s, monospace\"", upcean_font_family);
} else {
fm_printf(fmp, " font-family=\"%s, Arial, sans-serif\"", normal_font_family);
}
svg_put_fattrib(" font-size=\"", 1, string->fsize, fmp);
if (bold) {
fm_puts(" font-weight=\"bold\"", fmp);
}
if (string->rotation != 0) {
fm_printf(fmp, " transform=\"rotate(%d", string->rotation);
fm_putsf(",", 2, string->x, fmp);
fm_putsf(",", 2, string->y, fmp);
fm_puts(")\"", fmp);
}
svg_put_opacity_close(fg_alpha, fg_alpha_opacity, 0 /*close*/, fmp);
svg_make_html_friendly(string->text, html_string);
fm_printf(fmp, " %s\n", html_string);
fm_puts(" </text>\n", fmp);
string = string->next;
}
fm_puts(" </g>\n"
"</svg>\n", fmp);
if (fm_error(fmp)) {
errtxtf(0, symbol, 682, "Incomplete write to SVG output (%1$d: %2$s)", fmp->err, strerror(fmp->err));
(void) fm_close(fmp, symbol);
return ZINT_ERROR_FILE_WRITE;
}
if (!fm_close(fmp, symbol)) {
return errtxtf(ZINT_ERROR_FILE_WRITE, symbol, 684, "Failure on closing SVG output file (%1$d: %2$s)",
fmp->err, strerror(fmp->err));
}
return 0;
}
/* vim: set ts=4 sw=4 et : */