636 lines
25 KiB
C
636 lines
25 KiB
C
/*
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* Copyright (C) 1995 Spencer Kimball and Peter Mattis
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*
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* This is a plug-in for PIKA.
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*
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* Plugin to convert a selection to a path.
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*
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* Copyright (C) 1999 Andy Thomas alt@gimp.org
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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 <https://www.gnu.org/licenses/>.
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*
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*/
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/* Change log:-
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* 0.1 First version.
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*/
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#include "config.h"
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#include <string.h>
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#include "libpika/pika.h"
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#include "libpika/pikaui.h"
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#include "libpikamath/pikamath.h"
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#include "global.h"
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#include "types.h"
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#include "pxl-outline.h"
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#include "fit.h"
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#include "spline.h"
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#include "selection-to-path.h"
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#include "libpika/stdplugins-intl.h"
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#define PLUG_IN_PROC "plug-in-sel2path"
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#define PLUG_IN_BINARY "selection-to-path"
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#define PLUG_IN_ROLE "pika-selection-to-path"
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#define RESPONSE_RESET 1
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#define MID_POINT 127
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typedef struct _Sel2path Sel2path;
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typedef struct _Sel2pathClass Sel2pathClass;
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struct _Sel2path
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{
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PikaPlugIn parent_instance;
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};
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struct _Sel2pathClass
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{
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PikaPlugInClass parent_class;
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};
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#define SEL2PATH_TYPE (sel2path_get_type ())
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#define SEL2PATH (obj) (G_TYPE_CHECK_INSTANCE_CAST ((obj), SEL2PATH_TYPE, Sel2path))
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GType sel2path_get_type (void) G_GNUC_CONST;
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static GList * sel2path_query_procedures (PikaPlugIn *plug_in);
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static PikaProcedure * sel2path_create_procedure (PikaPlugIn *plug_in,
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const gchar *name);
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static PikaValueArray * sel2path_run (PikaProcedure *procedure,
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PikaRunMode run_mode,
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PikaImage *image,
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gint n_drawables,
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PikaDrawable **drawables,
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PikaProcedureConfig *config,
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gpointer run_data);
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static gint sel2path_dialog (PikaProcedure *procedure,
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PikaProcedureConfig *config);
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static gboolean sel2path (PikaImage *image);
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G_DEFINE_TYPE (Sel2path, sel2path, PIKA_TYPE_PLUG_IN)
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PIKA_MAIN (SEL2PATH_TYPE)
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DEFINE_STD_SET_I18N
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static gint sel_x1, sel_y1, sel_x2, sel_y2;
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static gint has_sel, sel_width, sel_height;
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static GeglSampler *sel_sampler;
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static void
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sel2path_class_init (Sel2pathClass *klass)
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{
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PikaPlugInClass *plug_in_class = PIKA_PLUG_IN_CLASS (klass);
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plug_in_class->query_procedures = sel2path_query_procedures;
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plug_in_class->create_procedure = sel2path_create_procedure;
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plug_in_class->set_i18n = STD_SET_I18N;
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}
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static void
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sel2path_init (Sel2path *sel2path)
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{
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}
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static GList *
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sel2path_query_procedures (PikaPlugIn *plug_in)
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{
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return g_list_append (NULL, g_strdup (PLUG_IN_PROC));
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}
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static PikaProcedure *
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sel2path_create_procedure (PikaPlugIn *plug_in,
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const gchar *name)
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{
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PikaProcedure *procedure = NULL;
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if (! strcmp (name, PLUG_IN_PROC))
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{
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procedure = pika_image_procedure_new (plug_in, name,
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PIKA_PDB_PROC_TYPE_PLUGIN,
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sel2path_run, NULL, NULL);
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pika_procedure_set_image_types (procedure, "*");
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pika_procedure_set_sensitivity_mask (procedure,
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PIKA_PROCEDURE_SENSITIVE_DRAWABLE |
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PIKA_PROCEDURE_SENSITIVE_DRAWABLES |
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PIKA_PROCEDURE_SENSITIVE_NO_DRAWABLES);
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pika_procedure_set_documentation (procedure,
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_("Converts a selection to a path"),
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_("Converts a selection to a path"),
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name);
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pika_procedure_set_attribution (procedure,
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"Andy Thomas",
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"Andy Thomas",
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"1999");
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PIKA_PROC_ARG_DOUBLE (procedure, "align-threshold",
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_("_Align Threshold"),
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_("If two endpoints are closer than this, "
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"they are made to be equal."),
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0.2, 2.0, 0.5,
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G_PARAM_READWRITE);
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PIKA_PROC_ARG_DOUBLE (procedure, "corner-always-threshold",
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_("Corner Al_ways Threshold"),
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_("If the angle defined by a point and its predecessors "
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"and successors is smaller than this, it's a corner, "
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"even if it's within 'corner_surround' pixels of a "
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"point with a smaller angle."),
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30, 180, 60.0,
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G_PARAM_READWRITE);
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PIKA_PROC_ARG_INT (procedure, "corner-surround",
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_("Corner _Surround"),
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_("Number of points to consider when determining if a "
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"point is a corner or not."),
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3, 8, 4,
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G_PARAM_READWRITE);
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PIKA_PROC_ARG_DOUBLE (procedure, "corner-threshold",
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_("Cor_ner Threshold"),
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_("If a point, its predecessors, and its successors "
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"define an angle smaller than this, it's a corner."),
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0, 180, 100.0,
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G_PARAM_READWRITE);
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PIKA_PROC_ARG_DOUBLE (procedure, "error-threshold",
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_("Error Thres_hold"),
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_("Amount of error at which a fitted spline is "
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"unacceptable. If any pixel is further away "
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"than this from the fitted curve, we try again."),
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0.2, 10, 0.4,
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G_PARAM_READWRITE);
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PIKA_PROC_ARG_INT (procedure, "filter-alternative-surround",
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_("_Filter Alternative Surround"),
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_("A second number of adjacent points to consider "
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"when filtering."),
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1, 10, 1,
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G_PARAM_READWRITE);
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PIKA_PROC_ARG_DOUBLE (procedure, "filter-epsilon",
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_("Filter E_psilon"),
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_("If the angles between the vectors produced by "
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"filter_surround and filter_alternative_surround "
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"points differ by more than this, use the one from "
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"filter_alternative_surround."),
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5, 40, 10.0,
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G_PARAM_READWRITE);
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PIKA_PROC_ARG_INT (procedure, "filter-iteration-count",
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_("Filter Iteration Co_unt"),
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_("Number of times to smooth original data points. "
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"Increasing this number dramatically --- to 50 or "
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"so --- can produce vastly better results. But if "
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"any points that 'should' be corners aren't found, "
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"the curve goes to hell around that point."),
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4, 70, 4,
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G_PARAM_READWRITE);
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PIKA_PROC_ARG_DOUBLE (procedure, "filter-percent",
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_("Filt_er Percent"),
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_("To produce the new point, use the old point plus "
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"this times the neighbors."),
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0, 1, 0.33,
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G_PARAM_READWRITE);
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PIKA_PROC_ARG_INT (procedure, "filter-secondary-surround",
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_("Filter Secondar_y Surround"),
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_("Number of adjacent points to consider if "
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"'filter_surround' points defines a straight line."),
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3, 10, 3,
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G_PARAM_READWRITE);
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PIKA_PROC_ARG_INT (procedure, "filter-surround",
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_("Filter Surroun_d"),
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_("Number of adjacent points to consider when filtering."),
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2, 10, 2,
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G_PARAM_READWRITE);
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PIKA_PROC_ARG_BOOLEAN (procedure, "keep-knees",
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_("_Keep Knees"),
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_("Says whether or not to remove 'knee' "
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"points after finding the outline."),
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FALSE,
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G_PARAM_READWRITE);
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PIKA_PROC_ARG_DOUBLE (procedure, "line-reversion-threshold",
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_("_Line Reversion Threshold"),
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_("If a spline is closer to a straight line than this, "
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"it remains a straight line, even if it would otherwise "
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"be changed back to a curve. This is weighted by the "
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"square of the curve length, to make shorter curves "
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"more likely to be reverted."),
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0.01, 0.2, 0.01,
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G_PARAM_READWRITE);
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PIKA_PROC_ARG_DOUBLE (procedure, "line-threshold",
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_("L_ine Threshold"),
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_("How many pixels (on the average) a spline can "
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"diverge from the line determined by its endpoints "
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"before it is changed to a straight line."),
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0.2, 4, 0.5,
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G_PARAM_READWRITE);
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PIKA_PROC_ARG_DOUBLE (procedure, "reparametrize-improvement",
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_("Reparametri_ze Improvement"),
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_("If reparameterization doesn't improve the fit by this "
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"much percent, stop doing it. ""Amount of error at which "
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"it is pointless to reparameterize."),
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0, 1, 0.01,
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G_PARAM_READWRITE);
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PIKA_PROC_ARG_DOUBLE (procedure, "reparametrize-threshold",
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_("Repara_metrize Threshold"),
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_("Amount of error at which it is pointless to reparameterize. "
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"This happens, for example, when we are trying to fit the "
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"outline of the outside of an 'O' with a single spline. "
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"The initial fit is not good enough for the Newton-Raphson "
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"iteration to improve it. It may be that it would be better "
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"to detect the cases where we didn't find any corners."),
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1, 50, 1.0,
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G_PARAM_READWRITE);
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PIKA_PROC_ARG_DOUBLE (procedure, "subdivide-search",
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_("Subdi_vide Search"),
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_("Percentage of the curve away from the worst point "
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"to look for a better place to subdivide."),
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0.05, 1, 0.1,
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G_PARAM_READWRITE);
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PIKA_PROC_ARG_INT (procedure, "subdivide-surround",
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_("Su_bdivide Surround"),
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_("Number of points to consider when deciding whether "
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"a given point is a better place to subdivide."),
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2, 10, 4,
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G_PARAM_READWRITE);
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PIKA_PROC_ARG_DOUBLE (procedure, "subdivide-threshold",
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_("Subdivide Th_reshold"),
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_("How many pixels a point can diverge from a straight "
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"line and still be considered a better place to "
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"subdivide."),
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0.01, 1, 0.03,
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G_PARAM_READWRITE);
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PIKA_PROC_ARG_INT (procedure, "tangent-surround",
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_("_Tangent Surround"),
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_("Number of points to look at on either side of a "
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"point when computing the approximation to the "
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"tangent at that point."),
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2, 10, 3,
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G_PARAM_READWRITE);
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}
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return procedure;
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}
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static PikaValueArray *
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sel2path_run (PikaProcedure *procedure,
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PikaRunMode run_mode,
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PikaImage *image,
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gint n_drawables,
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PikaDrawable **drawables,
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PikaProcedureConfig *config,
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gpointer run_data)
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{
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gegl_init (NULL, NULL);
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if (pika_selection_is_empty (image))
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{
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g_message (_("No selection to convert"));
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return pika_procedure_new_return_values (procedure,
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PIKA_PDB_SUCCESS,
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NULL);
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}
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if (run_mode == PIKA_RUN_INTERACTIVE &&
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! sel2path_dialog (procedure, config))
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return pika_procedure_new_return_values (procedure,
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PIKA_PDB_CANCEL,
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NULL);
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fit_set_params (config);
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if (! sel2path (image))
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return pika_procedure_new_return_values (procedure,
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PIKA_PDB_EXECUTION_ERROR,
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NULL);
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return pika_procedure_new_return_values (procedure, PIKA_PDB_SUCCESS, NULL);
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}
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/* Build the dialog up. This was the hard part! */
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static gint
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sel2path_dialog (PikaProcedure *procedure,
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PikaProcedureConfig *config)
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{
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GtkWidget *dialog;
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GtkWidget *vbox;
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GtkWidget *scrolled_win;
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gboolean run;
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pika_ui_init (PLUG_IN_BINARY);
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dialog = pika_procedure_dialog_new (procedure,
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PIKA_PROCEDURE_CONFIG (config),
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_("Selection to Path Advanced Settings"));
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pika_dialog_set_alternative_button_order (GTK_DIALOG (dialog),
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RESPONSE_RESET,
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GTK_RESPONSE_OK,
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GTK_RESPONSE_CANCEL,
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-1);
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pika_window_set_transient (GTK_WINDOW (dialog));
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pika_procedure_dialog_get_scale_entry (PIKA_PROCEDURE_DIALOG (dialog),
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"align-threshold", 1.0);
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pika_procedure_dialog_get_scale_entry (PIKA_PROCEDURE_DIALOG (dialog),
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"corner-always-threshold", 1.0);
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pika_procedure_dialog_get_scale_entry (PIKA_PROCEDURE_DIALOG (dialog),
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"corner-surround", 1.0);
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pika_procedure_dialog_get_scale_entry (PIKA_PROCEDURE_DIALOG (dialog),
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"corner-threshold", 1.0);
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pika_procedure_dialog_get_scale_entry (PIKA_PROCEDURE_DIALOG (dialog),
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"error-threshold", 1.0);
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pika_procedure_dialog_get_scale_entry (PIKA_PROCEDURE_DIALOG (dialog),
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"filter-alternative-surround", 1.0);
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pika_procedure_dialog_get_scale_entry (PIKA_PROCEDURE_DIALOG (dialog),
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"filter-epsilon", 1.0);
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pika_procedure_dialog_get_scale_entry (PIKA_PROCEDURE_DIALOG (dialog),
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"filter-iteration-count", 1.0);
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pika_procedure_dialog_get_scale_entry (PIKA_PROCEDURE_DIALOG (dialog),
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"filter-percent", 1.0);
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pika_procedure_dialog_get_scale_entry (PIKA_PROCEDURE_DIALOG (dialog),
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"filter-secondary-surround", 1.0);
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pika_procedure_dialog_get_scale_entry (PIKA_PROCEDURE_DIALOG (dialog),
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"filter-surround", 1.0);
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pika_procedure_dialog_get_scale_entry (PIKA_PROCEDURE_DIALOG (dialog),
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"line-reversion-threshold", 1.0);
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pika_procedure_dialog_get_scale_entry (PIKA_PROCEDURE_DIALOG (dialog),
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"line-threshold", 1.0);
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pika_procedure_dialog_get_scale_entry (PIKA_PROCEDURE_DIALOG (dialog),
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"reparametrize-improvement", 1.0);
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pika_procedure_dialog_get_scale_entry (PIKA_PROCEDURE_DIALOG (dialog),
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"reparametrize-threshold", 1.0);
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pika_procedure_dialog_get_scale_entry (PIKA_PROCEDURE_DIALOG (dialog),
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"subdivide-search", 1.0);
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pika_procedure_dialog_get_scale_entry (PIKA_PROCEDURE_DIALOG (dialog),
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"subdivide-surround", 1.0);
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pika_procedure_dialog_get_scale_entry (PIKA_PROCEDURE_DIALOG (dialog),
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"subdivide-threshold", 1.0);
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pika_procedure_dialog_get_scale_entry (PIKA_PROCEDURE_DIALOG (dialog),
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"tangent-surround", 1.0);
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vbox = pika_procedure_dialog_fill_box (PIKA_PROCEDURE_DIALOG (dialog),
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"selection-to-path-box",
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"align-threshold",
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"corner-always-threshold",
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"corner-surround",
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"corner-threshold",
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"error-threshold",
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"filter-alternative-surround",
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"filter-epsilon",
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"filter-iteration-count",
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"filter-percent",
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"filter-secondary-surround",
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"filter-surround",
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"keep-knees",
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"line-reversion-threshold",
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"line-threshold",
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"reparametrize-improvement",
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"reparametrize-threshold",
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"subdivide-search",
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"subdivide-surround",
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"subdivide-threshold",
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"tangent-surround",
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NULL);
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gtk_box_set_spacing (GTK_BOX (vbox), 12);
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scrolled_win = pika_procedure_dialog_fill_scrolled_window (PIKA_PROCEDURE_DIALOG (dialog),
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"scrollwin",
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"selection-to-path-box");
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gtk_widget_set_size_request (scrolled_win, 400, 400);
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gtk_scrolled_window_set_shadow_type (GTK_SCROLLED_WINDOW (scrolled_win),
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GTK_SHADOW_NONE);
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gtk_scrolled_window_set_policy (GTK_SCROLLED_WINDOW (scrolled_win),
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GTK_POLICY_NEVER,
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GTK_POLICY_ALWAYS);
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gtk_scrolled_window_set_overlay_scrolling (GTK_SCROLLED_WINDOW (scrolled_win),
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FALSE);
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pika_procedure_dialog_fill (PIKA_PROCEDURE_DIALOG (dialog),
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"scrollwin",
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NULL);
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gtk_widget_show (dialog);
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run = pika_procedure_dialog_run (PIKA_PROCEDURE_DIALOG (dialog));
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gtk_widget_destroy (dialog);
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return run;
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}
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guchar
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sel_pixel_value (gint row,
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gint col)
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{
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guchar ret;
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if (col > sel_width || row > sel_height)
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{
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g_warning ("sel_pixel_value [%d,%d] out of bounds", col, row);
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return 0;
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}
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gegl_sampler_get (sel_sampler,
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col + sel_x1, row + sel_y1, NULL, &ret, GEGL_ABYSS_NONE);
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return ret;
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}
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gboolean
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sel_pixel_is_white (gint row,
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gint col)
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{
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if (sel_pixel_value (row, col) < MID_POINT)
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return TRUE;
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else
|
|
return FALSE;
|
|
}
|
|
|
|
gint
|
|
sel_get_width (void)
|
|
{
|
|
return sel_width;
|
|
}
|
|
|
|
gint
|
|
sel_get_height (void)
|
|
{
|
|
return sel_height;
|
|
}
|
|
|
|
gboolean
|
|
sel_valid_pixel (gint row,
|
|
gint col)
|
|
{
|
|
return (0 <= (row) && (row) < sel_get_height ()
|
|
&& 0 <= (col) && (col) < sel_get_width ());
|
|
}
|
|
|
|
|
|
static void
|
|
do_points (spline_list_array_type in_splines,
|
|
PikaImage *image)
|
|
{
|
|
PikaVectors *vectors;
|
|
gint32 stroke;
|
|
gint i, j;
|
|
gboolean have_points = FALSE;
|
|
spline_list_type spline_list;
|
|
|
|
/* check if there really is something to do... */
|
|
for (i = 0; i < SPLINE_LIST_ARRAY_LENGTH (in_splines); i++)
|
|
{
|
|
spline_list = SPLINE_LIST_ARRAY_ELT (in_splines, i);
|
|
/* Ignore single points that are on their own */
|
|
if (SPLINE_LIST_LENGTH (spline_list) < 2)
|
|
continue;
|
|
have_points = TRUE;
|
|
break;
|
|
}
|
|
|
|
if (! have_points)
|
|
return;
|
|
|
|
vectors = pika_vectors_new (image, _("Selection"));
|
|
|
|
for (j = 0; j < SPLINE_LIST_ARRAY_LENGTH (in_splines); j++)
|
|
{
|
|
spline_type seg;
|
|
|
|
spline_list = SPLINE_LIST_ARRAY_ELT (in_splines, j);
|
|
|
|
/* Ignore single points that are on their own */
|
|
if (SPLINE_LIST_LENGTH (spline_list) < 2)
|
|
continue;
|
|
|
|
/*
|
|
* we're constructing the path backwards
|
|
* to have the result of least surprise for "Text along Path".
|
|
*/
|
|
seg = SPLINE_LIST_ELT (spline_list, SPLINE_LIST_LENGTH (spline_list) - 1);
|
|
stroke = pika_vectors_bezier_stroke_new_moveto (vectors,
|
|
END_POINT (seg).x,
|
|
END_POINT (seg).y);
|
|
|
|
for (i = SPLINE_LIST_LENGTH (spline_list); i > 0; i--)
|
|
{
|
|
seg = SPLINE_LIST_ELT (spline_list, i-1);
|
|
|
|
if (SPLINE_DEGREE (seg) == LINEAR)
|
|
pika_vectors_bezier_stroke_lineto (vectors, stroke,
|
|
START_POINT (seg).x,
|
|
START_POINT (seg).y);
|
|
else if (SPLINE_DEGREE (seg) == CUBIC)
|
|
pika_vectors_bezier_stroke_cubicto (vectors, stroke,
|
|
CONTROL2 (seg).x,
|
|
CONTROL2 (seg).y,
|
|
CONTROL1 (seg).x,
|
|
CONTROL1 (seg).y,
|
|
START_POINT (seg).x,
|
|
START_POINT (seg).y);
|
|
else
|
|
g_warning ("print_spline: strange degree (%d)",
|
|
SPLINE_DEGREE (seg));
|
|
}
|
|
|
|
pika_vectors_stroke_close (vectors, stroke);
|
|
|
|
/* transform to PIKAs coordinate system, taking the selections
|
|
* bounding box into account */
|
|
pika_vectors_stroke_scale (vectors, stroke, 1.0, -1.0);
|
|
pika_vectors_stroke_translate (vectors, stroke,
|
|
sel_x1, sel_y1 + sel_height + 1);
|
|
}
|
|
|
|
pika_image_insert_vectors (image, vectors, NULL, -1);
|
|
}
|
|
|
|
|
|
static gboolean
|
|
sel2path (PikaImage *image)
|
|
{
|
|
PikaSelection *selection;
|
|
GeglBuffer *sel_buffer;
|
|
pixel_outline_list_type olt;
|
|
spline_list_array_type splines;
|
|
|
|
pika_selection_bounds (image, &has_sel,
|
|
&sel_x1, &sel_y1, &sel_x2, &sel_y2);
|
|
|
|
sel_width = sel_x2 - sel_x1;
|
|
sel_height = sel_y2 - sel_y1;
|
|
|
|
/* Now get the selection channel */
|
|
|
|
selection = pika_image_get_selection (image);
|
|
|
|
if (! selection)
|
|
return FALSE;
|
|
|
|
sel_buffer = pika_drawable_get_buffer (PIKA_DRAWABLE (selection));
|
|
sel_sampler = gegl_buffer_sampler_new (sel_buffer,
|
|
babl_format ("Y u8"),
|
|
GEGL_SAMPLER_NEAREST);
|
|
|
|
olt = find_outline_pixels ();
|
|
|
|
splines = fitted_splines (olt);
|
|
|
|
do_points (splines, image);
|
|
|
|
g_object_unref (sel_sampler);
|
|
g_object_unref (sel_buffer);
|
|
|
|
pika_displays_flush ();
|
|
|
|
return TRUE;
|
|
}
|
|
|
|
void
|
|
safe_free (address *item)
|
|
{
|
|
g_free (*item);
|
|
*item = NULL;
|
|
}
|
