185 lines
4.4 KiB
C
185 lines
4.4 KiB
C
/* curve.c: operations on the lists of pixels and lists of curves.
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*
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* Copyright (C) 1992 Free Software Foundation, Inc.
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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, or (at your option)
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* 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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#include "config.h"
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#include <glib.h>
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#include "global.h"
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#include "curve.h"
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/* Return an entirely empty curve. */
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curve_type
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new_curve (void)
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{
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curve_type curve = g_new (struct curve, 1);
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curve->point_list = NULL;
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CURVE_LENGTH (curve) = 0;
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CURVE_CYCLIC (curve) = false;
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CURVE_START_TANGENT (curve) = CURVE_END_TANGENT (curve) = NULL;
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PREVIOUS_CURVE (curve) = NEXT_CURVE (curve) = NULL;
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return curve;
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}
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/* Start the returned curve off with COORD as the first point. */
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curve_type
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init_curve (coordinate_type coord)
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{
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curve_type curve = new_curve ();
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curve->point_list = g_new (point_type, 1);
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CURVE_LENGTH (curve) = 1;
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CURVE_POINT (curve, 0) = int_to_real_coord (coord);
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return curve;
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}
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/* Don't copy the points or tangents, but copy everything else. */
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curve_type
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copy_most_of_curve (curve_type old_curve)
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{
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curve_type curve = new_curve ();
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CURVE_CYCLIC (curve) = CURVE_CYCLIC (old_curve);
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PREVIOUS_CURVE (curve) = PREVIOUS_CURVE (old_curve);
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NEXT_CURVE (curve) = NEXT_CURVE (old_curve);
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return curve;
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}
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/* The length of CURVE will be zero if we ended up not being able to fit
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it (which in turn implies a problem elsewhere in the program, but at
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any rate, we shouldn't try here to free the nonexistent curve). */
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void
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free_curve (curve_type curve)
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{
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if (CURVE_LENGTH (curve) > 0)
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safe_free ((address *) &(curve->point_list));
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}
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void
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append_pixel (curve_type curve, coordinate_type coord)
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{
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append_point (curve, int_to_real_coord (coord));
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}
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void
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append_point (curve_type curve, real_coordinate_type coord)
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{
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CURVE_LENGTH (curve)++;
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curve->point_list = g_realloc (curve->point_list,CURVE_LENGTH (curve) * sizeof(point_type));
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LAST_CURVE_POINT (curve) = coord;
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/* The t value does not need to be set. */
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}
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/* Return an initialized but empty curve list. */
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curve_list_type
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new_curve_list (void)
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{
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curve_list_type curve_list;
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curve_list.length = 0;
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curve_list.data = NULL;
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curve_list.clockwise = FALSE;
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return curve_list;
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}
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/* Free a curve list and all the curves it contains. */
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void
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free_curve_list (curve_list_type *curve_list)
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{
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unsigned this_curve;
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for (this_curve = 0; this_curve < curve_list->length; this_curve++)
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free_curve (curve_list->data[this_curve]);
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/* If the character was empty, it won't have any curves. */
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if (curve_list->data != NULL)
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safe_free ((address *) &(curve_list->data));
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}
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/* Add an element to a curve list. */
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void
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append_curve (curve_list_type *curve_list, curve_type curve)
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{
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curve_list->length++;
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curve_list->data = g_realloc (curve_list->data,curve_list->length*sizeof(curve_type));
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curve_list->data[curve_list->length - 1] = curve;
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}
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/* Return an initialized but empty curve list array. */
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curve_list_array_type
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new_curve_list_array (void)
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{
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curve_list_array_type curve_list_array;
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CURVE_LIST_ARRAY_LENGTH (curve_list_array) = 0;
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curve_list_array.data = NULL;
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return curve_list_array;
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}
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/* Free a curve list array and all the curve lists it contains. */
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void
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free_curve_list_array (curve_list_array_type *curve_list_array)
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{
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unsigned this_list;
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for (this_list = 0; this_list < CURVE_LIST_ARRAY_LENGTH (*curve_list_array);
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this_list++)
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free_curve_list (&CURVE_LIST_ARRAY_ELT (*curve_list_array, this_list));
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/* If the character was empty, it won't have any curves. */
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if (curve_list_array->data != NULL)
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safe_free ((address *) &(curve_list_array->data));
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}
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/* Add an element to a curve list array. */
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void
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append_curve_list (curve_list_array_type *l, curve_list_type curve_list)
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{
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CURVE_LIST_ARRAY_LENGTH (*l)++;
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l->data = g_realloc (l->data,( CURVE_LIST_ARRAY_LENGTH (*l))*sizeof(curve_list_type));
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LAST_CURVE_LIST_ARRAY_ELT (*l) = curve_list;
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}
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