334 lines
10 KiB
C
334 lines
10 KiB
C
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/* Copyright 2023 Red Hat, Inc.
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*
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* GTK+ is free software; you can redistribute it and/or modify it
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* under the terms of the GNU Lesser General Public License as
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* published by the Free Software Foundation; either version 2 of the
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* License, or (at your option) any later version.
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*
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* GLib 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 GNU
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* Lesser General Public License for more details.
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*
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* You should have received a copy of the GNU Lesser General Public
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* License along with GTK+; see the file COPYING. If not,
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* see <http://www.gnu.org/licenses/>.
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*
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* Author: Matthias Clasen
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*/
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#include "config.h"
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#include <stdlib.h>
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#include <string.h>
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#include <errno.h>
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#include <glib/gi18n-lib.h>
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#include <glib/gprintf.h>
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#include <glib/gstdio.h>
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#include <gtk/gtk.h>
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#include "gtk-path-tool.h"
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static gboolean
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collect_cb (GskPathOperation op,
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const graphene_point_t *pts,
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gsize n_pts,
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float weight,
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gpointer data)
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{
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GskPathBuilder **builders = (GskPathBuilder **)data;
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switch (op)
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{
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case GSK_PATH_MOVE:
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if (builders[0])
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gsk_path_builder_move_to (builders[0], pts[0].x, pts[0].y);
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if (builders[1])
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gsk_path_builder_add_circle (builders[1], &pts[0], 4);
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break;
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case GSK_PATH_LINE:
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case GSK_PATH_CLOSE:
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if (builders[0])
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gsk_path_builder_line_to (builders[0], pts[1].x, pts[1].y);
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if (builders[1])
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gsk_path_builder_add_circle (builders[1], &pts[1], 4);
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break;
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case GSK_PATH_QUAD:
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case GSK_PATH_CONIC:
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if (builders[0])
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{
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gsk_path_builder_line_to (builders[0], pts[1].x, pts[1].y);
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gsk_path_builder_line_to (builders[0], pts[2].x, pts[2].y);
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}
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if (builders[1])
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gsk_path_builder_add_circle (builders[1], &pts[2], 4);
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if (builders[2])
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gsk_path_builder_add_circle (builders[2], &pts[1], 3);
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break;
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case GSK_PATH_CUBIC:
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if (builders[0])
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{
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gsk_path_builder_line_to (builders[0], pts[1].x, pts[1].y);
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gsk_path_builder_line_to (builders[0], pts[2].x, pts[2].y);
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gsk_path_builder_line_to (builders[0], pts[3].x, pts[3].y);
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}
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if (builders[1])
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gsk_path_builder_add_circle (builders[1], &pts[3], 4);
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if (builders[2])
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{
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gsk_path_builder_add_circle (builders[2], &pts[1], 3);
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gsk_path_builder_add_circle (builders[2], &pts[2], 3);
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}
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break;
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default:
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g_assert_not_reached ();
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}
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return TRUE;
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}
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void
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do_render (int *argc,
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const char ***argv)
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{
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GError *error = NULL;
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const char *fill = "winding";
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const char *fg_color = "black";
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const char *bg_color = "white";
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const char *point_color = "red";
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gboolean do_stroke = FALSE;
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gboolean show_points = FALSE;
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gboolean show_controls = FALSE;
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double line_width = 1;
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const char *cap = "butt";
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const char *join = "miter";
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double miter_limit = 4;
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const char *dashes = NULL;
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double dash_offset = 0;
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const char *output_file = NULL;
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char **args = NULL;
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GOptionContext *context;
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GOptionGroup *options;
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const GOptionEntry entries[] = {
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{ "fill", 0, G_OPTION_FLAG_REVERSE, G_OPTION_ARG_NONE, &do_stroke, N_("Fill the path (the default)"), NULL },
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{ "stroke", 0, 0, G_OPTION_ARG_NONE, &do_stroke, N_("Stroke the path"), NULL },
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{ "points", 0, 0, G_OPTION_ARG_NONE, &show_points, N_("Show path points"), NULL },
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{ "controls", 0, 0, G_OPTION_ARG_NONE, &show_controls, N_("Show control points"), NULL },
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{ "output", 0, 0, G_OPTION_ARG_FILENAME, &output_file, N_("The output file"), N_("FILE") },
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{ "fg-color", 0, 0, G_OPTION_ARG_STRING, &fg_color, N_("Foreground color"), N_("COLOR") },
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{ "bg-color", 0, 0, G_OPTION_ARG_STRING, &bg_color, N_("Background color"), N_("COLOR") },
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{ "point-color", 0, 0, G_OPTION_ARG_STRING, &point_color, N_("Point color"), N_("COLOR") },
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{ G_OPTION_REMAINING, 0, 0, G_OPTION_ARG_STRING_ARRAY, &args, NULL, N_("PATH") },
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{ NULL, }
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};
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const GOptionEntry fill_entries[] = {
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{ "fill-rule", 0, 0, G_OPTION_ARG_STRING, &fill, N_("Fill rule (winding, even-odd)"), N_("VALUE") },
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{ NULL, }
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};
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const GOptionEntry stroke_entries[] = {
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{ "line-width", 0, 0, G_OPTION_ARG_DOUBLE, &line_width, N_("Line width (number)"), N_("VALUE") },
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{ "line-cap", 0, 0, G_OPTION_ARG_STRING, &cap, N_("Line cap (butt, round, square)"), N_("VALUE") },
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{ "line-join", 0, 0, G_OPTION_ARG_STRING, &join, N_("Line join (miter, miter-clip, round, bevel, arcs)"), N_("VALUE") },
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{ "miter-limit", 0, 0, G_OPTION_ARG_DOUBLE, &miter_limit, N_("Miter limit (number)"), N_("VALUE") },
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{ "dashes", 0, 0, G_OPTION_ARG_STRING, &dashes, N_("Dash pattern (comma-separated numbers)"), N_("VALUE") },
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{ "dash-offset", 0, 0, G_OPTION_ARG_DOUBLE, &dash_offset, N_("Dash offset (number)"), N_("VALUE") },
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{ NULL, }
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};
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GskPath *path;
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GskPath *line_path = NULL;
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GskPath *point_path = NULL;
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GskFillRule fill_rule;
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GdkRGBA fg, bg, pc;
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graphene_rect_t bounds;
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GskRenderNode *fg_node, *pc_node, *nodes[5], *node;
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GdkSurface *surface;
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GskRenderer *renderer;
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GdkTexture *texture;
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const char *filename;
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GskLineCap line_cap;
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GskLineJoin line_join;
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GskStroke *stroke;
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GskPathBuilder *builders[3] = { NULL, NULL, NULL };
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int i;
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if (gdk_display_get_default () == NULL)
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{
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g_printerr ("%s\n", _("Could not initialize windowing system"));
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exit (1);
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}
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g_set_prgname ("gtk4-path-tool render");
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context = g_option_context_new (NULL);
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g_option_context_set_translation_domain (context, GETTEXT_PACKAGE);
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g_option_context_set_summary (context, _("Render the path to a png image."));
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g_option_context_add_main_entries (context, entries, NULL);
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options = g_option_group_new ("fill",
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_("Options related to filling"),
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_("Show help for fill options"),
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NULL, NULL);
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g_option_group_add_entries (options, fill_entries);
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g_option_group_set_translation_domain (options, GETTEXT_PACKAGE);
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g_option_context_add_group (context, options);
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options = g_option_group_new ("stroke",
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_("Options related to stroking"),
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_("Show help for stroke options"),
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NULL, NULL);
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g_option_group_add_entries (options, stroke_entries);
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g_option_group_set_translation_domain (options, GETTEXT_PACKAGE);
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g_option_context_add_group (context, options);
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if (!g_option_context_parse (context, argc, (char ***)argv, &error))
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{
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g_printerr ("%s\n", error->message);
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g_error_free (error);
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exit (1);
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}
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g_option_context_free (context);
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if (args == NULL)
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{
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g_printerr ("%s\n", _("No path specified"));
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exit (1);
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}
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if (g_strv_length (args) > 1)
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{
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g_printerr ("%s\n", _("Can only render a single path"));
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exit (1);
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}
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path = get_path (args[0]);
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if (show_controls)
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{
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builders[0] = gsk_path_builder_new ();
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builders[1] = gsk_path_builder_new ();
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builders[2] = gsk_path_builder_new ();
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}
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else if (show_points)
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{
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builders[1] = gsk_path_builder_new ();
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}
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if (builders[0] || builders[1] || builders[2])
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{
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gsk_path_foreach (path, -1, collect_cb, builders);
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if (builders[0])
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line_path = gsk_path_builder_free_to_path (builders[0]);
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if (builders[1] || builders[2])
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{
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GskPath *p1 = NULL;
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if (builders[1])
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p1 = gsk_path_builder_free_to_path (builders[1]);
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if (builders[2])
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{
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if (p1)
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{
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gsk_path_builder_add_path (builders[2], p1);
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gsk_path_unref (p1);
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}
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point_path = gsk_path_builder_free_to_path (builders[2]);
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}
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else
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point_path = p1;
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}
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}
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fill_rule = get_enum_value (GSK_TYPE_FILL_RULE, _("fill rule"), fill);
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get_color (&fg, fg_color);
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get_color (&bg, bg_color);
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get_color (&pc, point_color);
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line_cap = get_enum_value (GSK_TYPE_LINE_CAP, _("line cap"), cap);
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line_join = get_enum_value (GSK_TYPE_LINE_JOIN, _("line join"), join);
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stroke = gsk_stroke_new (line_width);
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gsk_stroke_set_line_cap (stroke, line_cap);
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gsk_stroke_set_line_join (stroke, line_join);
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gsk_stroke_set_miter_limit (stroke, miter_limit);
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gsk_stroke_set_dash_offset (stroke, dash_offset);
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_gsk_stroke_set_dashes (stroke, dashes);
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if (do_stroke)
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gsk_path_get_stroke_bounds (path, stroke, &bounds);
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else
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gsk_path_get_bounds (path, &bounds);
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graphene_rect_inset (&bounds, -10, -10);
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fg_node = gsk_color_node_new (&fg, &bounds);
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pc_node = gsk_color_node_new (&pc, &bounds);
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i = 0;
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nodes[i++] = gsk_color_node_new (&bg, &bounds);
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if (line_path)
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{
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GskStroke *line_stroke = gsk_stroke_new (1);
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gsk_stroke_set_dash (line_stroke, (const float[]) { 1, 1 }, 2);
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nodes[i++] = gsk_stroke_node_new (fg_node, line_path, line_stroke);
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gsk_stroke_free (line_stroke);
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}
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if (point_path)
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{
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nodes[i++] = gsk_fill_node_new (pc_node, point_path, GSK_FILL_RULE_WINDING);
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nodes[i++] = gsk_stroke_node_new (fg_node, point_path, stroke);
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}
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if (do_stroke)
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nodes[i++] = gsk_stroke_node_new (fg_node, path, stroke);
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else
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nodes[i++] = gsk_fill_node_new (fg_node, path, fill_rule);
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node = gsk_container_node_new (nodes, i);
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gsk_render_node_unref (fg_node);
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gsk_render_node_unref (pc_node);
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for (i--; i >= 0; i--)
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gsk_render_node_unref (nodes[i]);
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surface = gdk_surface_new_toplevel (gdk_display_get_default ());
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renderer = gsk_renderer_new_for_surface (surface);
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texture = gsk_renderer_render_texture (renderer, node, &bounds);
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filename = output_file ? output_file : "path.png";
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if (!gdk_texture_save_to_png (texture, filename))
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{
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char *msg = g_strdup_printf (_("Saving png to '%s' failed"), filename);
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g_printerr ("%s\n", msg);
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exit (1);
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}
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if (output_file == NULL)
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{
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char *msg = g_strdup_printf (_("Output written to '%s'."), filename);
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g_print ("%s\n", msg);
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g_free (msg);
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}
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g_object_unref (texture);
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gsk_renderer_unrealize (renderer);
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g_object_unref (renderer);
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g_object_unref (surface);
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gsk_render_node_unref (node);
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gsk_path_unref (path);
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g_clear_pointer (&line_path, gsk_path_unref);
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g_clear_pointer (&point_path, gsk_path_unref);
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g_strfreev (args);
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}
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