mirror of https://github.com/GNOME/gimp.git
108 lines
3.1 KiB
C
108 lines
3.1 KiB
C
/* invert-svg-grey.c
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* Copyright (C) 2016 Jehan
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*
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* This program is free software: you can redistribute it and/or modify
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* it under the terms of the GNU General Public License as published by
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* the Free Software Foundation; either version 3 of the License, or
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* (at your option) any later version.
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*
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* This program is distributed in the hope that it will be useful,
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* but WITHOUT ANY WARRANTY; without even the implied warranty of
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* MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
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* GNU General Public License for more details.
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*
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* You should have received a copy of the GNU General Public License
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* along with this program. If not, see <http://www.gnu.org/licenses/>.
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*/
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#include <gio/gio.h>
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#include <glib/gprintf.h>
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#include <stdlib.h>
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#include <string.h>
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/* This tool inverts grey colors in a SVG image.
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* Non-grey colors are not touched, since they are considered
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* exceptions that we would want to keep the same (for instance
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* Red, Blue or Green channel representations).
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*
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* It is not based off XML knowledge since colors could appear in
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* various fields. Instead we just assume that a color has the XML
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* format "#RRGGBB" and we use regular expression to update these.
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*/
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static gboolean
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invert_rgb_color (const GMatchInfo *info,
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GString *res,
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gpointer data)
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{
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gchar *match;
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gchar *inverted;
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gint value;
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/* We only invert grey colors, so we just need the first channel. */
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match = g_match_info_fetch (info, 1);
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value = strtol (match, NULL, 16);
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value = 255 - value;
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inverted = g_strdup_printf ("#%02x%02x%02x",
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value, value, value);
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g_string_append (res, inverted);
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g_free (inverted);
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g_free (match);
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return FALSE;
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}
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int main (int argc, char **argv)
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{
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gchar *input;
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gchar *output;
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GFile *file;
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gchar *contents;
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gchar *replaced;
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GRegex *regex;
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gint retval = 0;
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if (argc != 3)
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{
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g_fprintf (stderr, "Usage: invert-svg svg-image inverted-svg-output\n");
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return 1;
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}
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input = argv[1];
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output = argv[2];
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file = g_file_new_for_path (input);
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if (! g_file_load_contents (file, NULL, &contents, NULL, NULL, NULL))
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{
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g_fprintf (stderr,
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"Error: invert-svg could not load contents of file %s.\n",
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input);
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g_object_unref (file);
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return 1;
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}
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g_object_unref (file);
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/* Replace grey colors only. */
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regex = g_regex_new ("#([0-9a-fA-F]{2}){3}\\b", 0, 0, NULL);
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replaced = g_regex_replace_eval (regex, contents, -1, 0, 0,
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invert_rgb_color, NULL, NULL);
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file = g_file_new_for_path (output);
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if (! g_file_replace_contents (file, replaced, strlen (replaced),
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NULL, FALSE,
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G_FILE_CREATE_REPLACE_DESTINATION,
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NULL, NULL, NULL))
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{
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g_fprintf (stderr,
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"Error: invert-svg could not save file %s.\n",
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output);
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retval = 1;
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}
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g_object_unref (file);
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g_free (contents);
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g_free (replaced);
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g_regex_unref (regex);
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return retval;
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}
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