389 lines
12 KiB
C
389 lines
12 KiB
C
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/* PIKA - Photo and Image Kooker Application
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* a rebranding of The GNU Image Manipulation Program (created with heckimp)
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* A derived work which may be trivial. However, any changes may be (C)2023 by Aldercone Studio
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*
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* Original copyright, applying to most contents (license remains unchanged):
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* Copyright (C) 1995 Spencer Kimball and Peter Mattis
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*
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* pikacanvasboundary.c
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* Copyright (C) 2010 Michael Natterer <mitch@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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#include "config.h"
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#include <gegl.h>
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#include <gtk/gtk.h>
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#include "libpikabase/pikabase.h"
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#include "libpikamath/pikamath.h"
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#include "display-types.h"
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#include "core/pika-cairo.h"
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#include "core/pika-transform-utils.h"
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#include "core/pikaboundary.h"
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#include "core/pikaparamspecs.h"
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#include "pikacanvasboundary.h"
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#include "pikadisplayshell.h"
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enum
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{
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PROP_0,
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PROP_SEGS,
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PROP_TRANSFORM,
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PROP_OFFSET_X,
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PROP_OFFSET_Y
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};
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typedef struct _PikaCanvasBoundaryPrivate PikaCanvasBoundaryPrivate;
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struct _PikaCanvasBoundaryPrivate
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{
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PikaBoundSeg *segs;
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gint n_segs;
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PikaMatrix3 *transform;
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gdouble offset_x;
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gdouble offset_y;
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};
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#define GET_PRIVATE(boundary) \
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((PikaCanvasBoundaryPrivate *) pika_canvas_boundary_get_instance_private ((PikaCanvasBoundary *) (boundary)))
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/* local function prototypes */
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static void pika_canvas_boundary_finalize (GObject *object);
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static void pika_canvas_boundary_set_property (GObject *object,
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guint property_id,
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const GValue *value,
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GParamSpec *pspec);
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static void pika_canvas_boundary_get_property (GObject *object,
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guint property_id,
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GValue *value,
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GParamSpec *pspec);
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static void pika_canvas_boundary_draw (PikaCanvasItem *item,
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cairo_t *cr);
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static cairo_region_t * pika_canvas_boundary_get_extents (PikaCanvasItem *item);
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G_DEFINE_TYPE_WITH_PRIVATE (PikaCanvasBoundary, pika_canvas_boundary,
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PIKA_TYPE_CANVAS_ITEM)
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#define parent_class pika_canvas_boundary_parent_class
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static void
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pika_canvas_boundary_class_init (PikaCanvasBoundaryClass *klass)
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{
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GObjectClass *object_class = G_OBJECT_CLASS (klass);
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PikaCanvasItemClass *item_class = PIKA_CANVAS_ITEM_CLASS (klass);
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object_class->finalize = pika_canvas_boundary_finalize;
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object_class->set_property = pika_canvas_boundary_set_property;
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object_class->get_property = pika_canvas_boundary_get_property;
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item_class->draw = pika_canvas_boundary_draw;
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item_class->get_extents = pika_canvas_boundary_get_extents;
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g_object_class_install_property (object_class, PROP_SEGS,
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pika_param_spec_array ("segs", NULL, NULL,
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PIKA_PARAM_READWRITE));
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g_object_class_install_property (object_class, PROP_TRANSFORM,
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g_param_spec_pointer ("transform", NULL, NULL,
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PIKA_PARAM_READWRITE));
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g_object_class_install_property (object_class, PROP_OFFSET_X,
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g_param_spec_double ("offset-x", NULL, NULL,
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-PIKA_MAX_IMAGE_SIZE,
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PIKA_MAX_IMAGE_SIZE, 0,
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PIKA_PARAM_READWRITE));
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g_object_class_install_property (object_class, PROP_OFFSET_Y,
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g_param_spec_double ("offset-y", NULL, NULL,
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-PIKA_MAX_IMAGE_SIZE,
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PIKA_MAX_IMAGE_SIZE, 0,
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PIKA_PARAM_READWRITE));
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}
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static void
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pika_canvas_boundary_init (PikaCanvasBoundary *boundary)
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{
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pika_canvas_item_set_line_cap (PIKA_CANVAS_ITEM (boundary),
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CAIRO_LINE_CAP_SQUARE);
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}
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static void
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pika_canvas_boundary_finalize (GObject *object)
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{
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PikaCanvasBoundaryPrivate *private = GET_PRIVATE (object);
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g_clear_pointer (&private->segs, g_free);
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private->n_segs = 0;
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g_clear_pointer (&private->transform, g_free);
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G_OBJECT_CLASS (parent_class)->finalize (object);
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}
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static void
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pika_canvas_boundary_set_property (GObject *object,
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guint property_id,
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const GValue *value,
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GParamSpec *pspec)
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{
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PikaCanvasBoundaryPrivate *private = GET_PRIVATE (object);
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switch (property_id)
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{
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case PROP_SEGS:
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break;
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case PROP_TRANSFORM:
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{
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PikaMatrix3 *transform = g_value_get_pointer (value);
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if (private->transform)
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g_free (private->transform);
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if (transform)
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private->transform = g_memdup2 (transform, sizeof (PikaMatrix3));
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else
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private->transform = NULL;
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}
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break;
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case PROP_OFFSET_X:
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private->offset_x = g_value_get_double (value);
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break;
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case PROP_OFFSET_Y:
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private->offset_y = g_value_get_double (value);
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break;
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default:
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G_OBJECT_WARN_INVALID_PROPERTY_ID (object, property_id, pspec);
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break;
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}
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}
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static void
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pika_canvas_boundary_get_property (GObject *object,
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guint property_id,
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GValue *value,
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GParamSpec *pspec)
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{
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PikaCanvasBoundaryPrivate *private = GET_PRIVATE (object);
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switch (property_id)
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{
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case PROP_SEGS:
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break;
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case PROP_TRANSFORM:
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g_value_set_pointer (value, private->transform);
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break;
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case PROP_OFFSET_X:
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g_value_set_double (value, private->offset_x);
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break;
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case PROP_OFFSET_Y:
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g_value_set_double (value, private->offset_y);
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break;
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default:
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G_OBJECT_WARN_INVALID_PROPERTY_ID (object, property_id, pspec);
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break;
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}
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}
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static void
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pika_canvas_boundary_transform (PikaCanvasItem *item,
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PikaSegment *segs,
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gint *n_segs)
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{
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PikaCanvasBoundaryPrivate *private = GET_PRIVATE (item);
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gint i;
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if (private->transform)
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{
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gint n = 0;
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for (i = 0; i < private->n_segs; i++)
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{
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PikaVector2 vertices[2];
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PikaVector2 t_vertices[2];
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gint n_t_vertices;
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vertices[0] = (PikaVector2) { private->segs[i].x1, private->segs[i].y1 };
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vertices[1] = (PikaVector2) { private->segs[i].x2, private->segs[i].y2 };
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pika_transform_polygon (private->transform, vertices, 2, FALSE,
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t_vertices, &n_t_vertices);
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if (n_t_vertices == 2)
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{
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pika_canvas_item_transform_xy (item,
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t_vertices[0].x + private->offset_x,
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t_vertices[0].y + private->offset_y,
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&segs[n].x1, &segs[n].y1);
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pika_canvas_item_transform_xy (item,
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t_vertices[1].x + private->offset_x,
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t_vertices[1].y + private->offset_y,
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&segs[n].x2, &segs[n].y2);
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n++;
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}
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}
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*n_segs = n;
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}
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else
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{
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for (i = 0; i < private->n_segs; i++)
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{
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pika_canvas_item_transform_xy (item,
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private->segs[i].x1 + private->offset_x,
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private->segs[i].y1 + private->offset_y,
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&segs[i].x1,
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&segs[i].y1);
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pika_canvas_item_transform_xy (item,
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private->segs[i].x2 + private->offset_x,
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private->segs[i].y2 + private->offset_y,
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&segs[i].x2,
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&segs[i].y2);
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/* If this segment is a closing segment && the segments lie inside
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* the region, OR if this is an opening segment and the segments
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* lie outside the region...
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* we need to transform it by one display pixel
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*/
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if (! private->segs[i].open)
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{
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/* If it is vertical */
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if (segs[i].x1 == segs[i].x2)
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{
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segs[i].x1 -= 1;
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segs[i].x2 -= 1;
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}
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else
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{
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segs[i].y1 -= 1;
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segs[i].y2 -= 1;
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}
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}
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}
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*n_segs = private->n_segs;
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}
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}
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static void
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pika_canvas_boundary_draw (PikaCanvasItem *item,
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cairo_t *cr)
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{
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PikaCanvasBoundaryPrivate *private = GET_PRIVATE (item);
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PikaSegment *segs;
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gint n_segs;
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segs = g_new0 (PikaSegment, private->n_segs);
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pika_canvas_boundary_transform (item, segs, &n_segs);
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pika_cairo_segments (cr, segs, n_segs);
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_pika_canvas_item_stroke (item, cr);
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g_free (segs);
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}
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static cairo_region_t *
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pika_canvas_boundary_get_extents (PikaCanvasItem *item)
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{
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PikaCanvasBoundaryPrivate *private = GET_PRIVATE (item);
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cairo_rectangle_int_t rectangle;
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PikaSegment *segs;
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gint n_segs;
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gint x1, y1, x2, y2;
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gint i;
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segs = g_new0 (PikaSegment, private->n_segs);
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pika_canvas_boundary_transform (item, segs, &n_segs);
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if (n_segs == 0)
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{
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g_free (segs);
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return cairo_region_create ();
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}
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x1 = MIN (segs[0].x1, segs[0].x2);
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y1 = MIN (segs[0].y1, segs[0].y2);
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x2 = MAX (segs[0].x1, segs[0].x2);
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y2 = MAX (segs[0].y1, segs[0].y2);
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for (i = 1; i < n_segs; i++)
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{
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gint x3 = MIN (segs[i].x1, segs[i].x2);
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gint y3 = MIN (segs[i].y1, segs[i].y2);
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gint x4 = MAX (segs[i].x1, segs[i].x2);
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gint y4 = MAX (segs[i].y1, segs[i].y2);
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x1 = MIN (x1, x3);
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y1 = MIN (y1, y3);
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x2 = MAX (x2, x4);
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y2 = MAX (y2, y4);
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}
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g_free (segs);
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rectangle.x = x1 - 2;
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rectangle.y = y1 - 2;
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rectangle.width = x2 - x1 + 4;
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rectangle.height = y2 - y1 + 4;
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return cairo_region_create_rectangle (&rectangle);
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}
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PikaCanvasItem *
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pika_canvas_boundary_new (PikaDisplayShell *shell,
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const PikaBoundSeg *segs,
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gint n_segs,
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PikaMatrix3 *transform,
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gdouble offset_x,
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gdouble offset_y)
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{
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PikaCanvasItem *item;
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PikaCanvasBoundaryPrivate *private;
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g_return_val_if_fail (PIKA_IS_DISPLAY_SHELL (shell), NULL);
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item = g_object_new (PIKA_TYPE_CANVAS_BOUNDARY,
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"shell", shell,
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"transform", transform,
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"offset-x", offset_x,
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"offset-y", offset_y,
|
||
|
|
NULL);
|
||
|
|
private = GET_PRIVATE (item);
|
||
|
|
|
||
|
|
/* puke */
|
||
|
|
private->segs = g_memdup2 (segs, n_segs * sizeof (PikaBoundSeg));
|
||
|
|
private->n_segs = n_segs;
|
||
|
|
|
||
|
|
return item;
|
||
|
|
}
|
