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-rw-r--r--app/display/gimpcanvasboundary.c384
1 files changed, 384 insertions, 0 deletions
diff --git a/app/display/gimpcanvasboundary.c b/app/display/gimpcanvasboundary.c
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+++ b/app/display/gimpcanvasboundary.c
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+/* GIMP - The GNU Image Manipulation Program
+ * Copyright (C) 1995 Spencer Kimball and Peter Mattis
+ *
+ * gimpcanvasboundary.c
+ * Copyright (C) 2010 Michael Natterer <mitch@gimp.org>
+ *
+ * This program is free software: you can redistribute it and/or modify
+ * it under the terms of the GNU General Public License as published by
+ * the Free Software Foundation; either version 3 of the License, or
+ * (at your option) any later version.
+ *
+ * This program is distributed in the hope that it will be useful,
+ * but WITHOUT ANY WARRANTY; without even the implied warranty of
+ * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
+ * GNU General Public License for more details.
+ *
+ * You should have received a copy of the GNU General Public License
+ * along with this program. If not, see <https://www.gnu.org/licenses/>.
+ */
+
+#include "config.h"
+
+#include <gegl.h>
+#include <gtk/gtk.h>
+
+#include "libgimpbase/gimpbase.h"
+#include "libgimpmath/gimpmath.h"
+
+#include "display-types.h"
+
+#include "core/gimp-cairo.h"
+#include "core/gimp-transform-utils.h"
+#include "core/gimpboundary.h"
+#include "core/gimpparamspecs.h"
+
+#include "gimpcanvasboundary.h"
+#include "gimpdisplayshell.h"
+
+
+enum
+{
+ PROP_0,
+ PROP_SEGS,
+ PROP_TRANSFORM,
+ PROP_OFFSET_X,
+ PROP_OFFSET_Y
+};
+
+
+typedef struct _GimpCanvasBoundaryPrivate GimpCanvasBoundaryPrivate;
+
+struct _GimpCanvasBoundaryPrivate
+{
+ GimpBoundSeg *segs;
+ gint n_segs;
+ GimpMatrix3 *transform;
+ gdouble offset_x;
+ gdouble offset_y;
+};
+
+#define GET_PRIVATE(boundary) \
+ ((GimpCanvasBoundaryPrivate *) gimp_canvas_boundary_get_instance_private ((GimpCanvasBoundary *) (boundary)))
+
+
+/* local function prototypes */
+
+static void gimp_canvas_boundary_finalize (GObject *object);
+static void gimp_canvas_boundary_set_property (GObject *object,
+ guint property_id,
+ const GValue *value,
+ GParamSpec *pspec);
+static void gimp_canvas_boundary_get_property (GObject *object,
+ guint property_id,
+ GValue *value,
+ GParamSpec *pspec);
+static void gimp_canvas_boundary_draw (GimpCanvasItem *item,
+ cairo_t *cr);
+static cairo_region_t * gimp_canvas_boundary_get_extents (GimpCanvasItem *item);
+
+
+G_DEFINE_TYPE_WITH_PRIVATE (GimpCanvasBoundary, gimp_canvas_boundary,
+ GIMP_TYPE_CANVAS_ITEM)
+
+#define parent_class gimp_canvas_boundary_parent_class
+
+
+static void
+gimp_canvas_boundary_class_init (GimpCanvasBoundaryClass *klass)
+{
+ GObjectClass *object_class = G_OBJECT_CLASS (klass);
+ GimpCanvasItemClass *item_class = GIMP_CANVAS_ITEM_CLASS (klass);
+
+ object_class->finalize = gimp_canvas_boundary_finalize;
+ object_class->set_property = gimp_canvas_boundary_set_property;
+ object_class->get_property = gimp_canvas_boundary_get_property;
+
+ item_class->draw = gimp_canvas_boundary_draw;
+ item_class->get_extents = gimp_canvas_boundary_get_extents;
+
+ g_object_class_install_property (object_class, PROP_SEGS,
+ gimp_param_spec_array ("segs", NULL, NULL,
+ GIMP_PARAM_READWRITE));
+
+ g_object_class_install_property (object_class, PROP_TRANSFORM,
+ g_param_spec_pointer ("transform", NULL, NULL,
+ GIMP_PARAM_READWRITE));
+
+ g_object_class_install_property (object_class, PROP_OFFSET_X,
+ g_param_spec_double ("offset-x", NULL, NULL,
+ -GIMP_MAX_IMAGE_SIZE,
+ GIMP_MAX_IMAGE_SIZE, 0,
+ GIMP_PARAM_READWRITE));
+
+ g_object_class_install_property (object_class, PROP_OFFSET_Y,
+ g_param_spec_double ("offset-y", NULL, NULL,
+ -GIMP_MAX_IMAGE_SIZE,
+ GIMP_MAX_IMAGE_SIZE, 0,
+ GIMP_PARAM_READWRITE));
+}
+
+static void
+gimp_canvas_boundary_init (GimpCanvasBoundary *boundary)
+{
+ gimp_canvas_item_set_line_cap (GIMP_CANVAS_ITEM (boundary),
+ CAIRO_LINE_CAP_SQUARE);
+}
+
+static void
+gimp_canvas_boundary_finalize (GObject *object)
+{
+ GimpCanvasBoundaryPrivate *private = GET_PRIVATE (object);
+
+ g_clear_pointer (&private->segs, g_free);
+ private->n_segs = 0;
+
+ g_clear_pointer (&private->transform, g_free);
+
+ G_OBJECT_CLASS (parent_class)->finalize (object);
+}
+
+static void
+gimp_canvas_boundary_set_property (GObject *object,
+ guint property_id,
+ const GValue *value,
+ GParamSpec *pspec)
+{
+ GimpCanvasBoundaryPrivate *private = GET_PRIVATE (object);
+
+ switch (property_id)
+ {
+ case PROP_SEGS:
+ break;
+
+ case PROP_TRANSFORM:
+ {
+ GimpMatrix3 *transform = g_value_get_pointer (value);
+ if (private->transform)
+ g_free (private->transform);
+ if (transform)
+ private->transform = g_memdup (transform, sizeof (GimpMatrix3));
+ else
+ private->transform = NULL;
+ }
+ break;
+
+ case PROP_OFFSET_X:
+ private->offset_x = g_value_get_double (value);
+ break;
+ case PROP_OFFSET_Y:
+ private->offset_y = g_value_get_double (value);
+ break;
+
+ default:
+ G_OBJECT_WARN_INVALID_PROPERTY_ID (object, property_id, pspec);
+ break;
+ }
+}
+
+static void
+gimp_canvas_boundary_get_property (GObject *object,
+ guint property_id,
+ GValue *value,
+ GParamSpec *pspec)
+{
+ GimpCanvasBoundaryPrivate *private = GET_PRIVATE (object);
+
+ switch (property_id)
+ {
+ case PROP_SEGS:
+ break;
+
+ case PROP_TRANSFORM:
+ g_value_set_pointer (value, private->transform);
+ break;
+
+ case PROP_OFFSET_X:
+ g_value_set_double (value, private->offset_x);
+ break;
+ case PROP_OFFSET_Y:
+ g_value_set_double (value, private->offset_y);
+ break;
+
+ default:
+ G_OBJECT_WARN_INVALID_PROPERTY_ID (object, property_id, pspec);
+ break;
+ }
+}
+
+static void
+gimp_canvas_boundary_transform (GimpCanvasItem *item,
+ GimpSegment *segs,
+ gint *n_segs)
+{
+ GimpCanvasBoundaryPrivate *private = GET_PRIVATE (item);
+ gint i;
+
+ if (private->transform)
+ {
+ gint n = 0;
+
+ for (i = 0; i < private->n_segs; i++)
+ {
+ GimpVector2 vertices[2];
+ GimpVector2 t_vertices[2];
+ gint n_t_vertices;
+
+ vertices[0] = (GimpVector2) { private->segs[i].x1, private->segs[i].y1 };
+ vertices[1] = (GimpVector2) { private->segs[i].x2, private->segs[i].y2 };
+
+ gimp_transform_polygon (private->transform, vertices, 2, FALSE,
+ t_vertices, &n_t_vertices);
+
+ if (n_t_vertices == 2)
+ {
+ gimp_canvas_item_transform_xy (item,
+ t_vertices[0].x + private->offset_x,
+ t_vertices[0].y + private->offset_y,
+ &segs[n].x1, &segs[n].y1);
+ gimp_canvas_item_transform_xy (item,
+ t_vertices[1].x + private->offset_x,
+ t_vertices[1].y + private->offset_y,
+ &segs[n].x2, &segs[n].y2);
+
+ n++;
+ }
+ }
+
+ *n_segs = n;
+ }
+ else
+ {
+ for (i = 0; i < private->n_segs; i++)
+ {
+ gimp_canvas_item_transform_xy (item,
+ private->segs[i].x1 + private->offset_x,
+ private->segs[i].y1 + private->offset_y,
+ &segs[i].x1,
+ &segs[i].y1);
+ gimp_canvas_item_transform_xy (item,
+ private->segs[i].x2 + private->offset_x,
+ private->segs[i].y2 + private->offset_y,
+ &segs[i].x2,
+ &segs[i].y2);
+
+ /* If this segment is a closing segment && the segments lie inside
+ * the region, OR if this is an opening segment and the segments
+ * lie outside the region...
+ * we need to transform it by one display pixel
+ */
+ if (! private->segs[i].open)
+ {
+ /* If it is vertical */
+ if (segs[i].x1 == segs[i].x2)
+ {
+ segs[i].x1 -= 1;
+ segs[i].x2 -= 1;
+ }
+ else
+ {
+ segs[i].y1 -= 1;
+ segs[i].y2 -= 1;
+ }
+ }
+ }
+
+ *n_segs = private->n_segs;
+ }
+}
+
+static void
+gimp_canvas_boundary_draw (GimpCanvasItem *item,
+ cairo_t *cr)
+{
+ GimpCanvasBoundaryPrivate *private = GET_PRIVATE (item);
+ GimpSegment *segs;
+ gint n_segs;
+
+ segs = g_new0 (GimpSegment, private->n_segs);
+
+ gimp_canvas_boundary_transform (item, segs, &n_segs);
+
+ gimp_cairo_segments (cr, segs, n_segs);
+
+ _gimp_canvas_item_stroke (item, cr);
+
+ g_free (segs);
+}
+
+static cairo_region_t *
+gimp_canvas_boundary_get_extents (GimpCanvasItem *item)
+{
+ GimpCanvasBoundaryPrivate *private = GET_PRIVATE (item);
+ cairo_rectangle_int_t rectangle;
+ GimpSegment *segs;
+ gint n_segs;
+ gint x1, y1, x2, y2;
+ gint i;
+
+ segs = g_new0 (GimpSegment, private->n_segs);
+
+ gimp_canvas_boundary_transform (item, segs, &n_segs);
+
+ if (n_segs == 0)
+ {
+ g_free (segs);
+
+ return cairo_region_create ();
+ }
+
+ x1 = MIN (segs[0].x1, segs[0].x2);
+ y1 = MIN (segs[0].y1, segs[0].y2);
+ x2 = MAX (segs[0].x1, segs[0].x2);
+ y2 = MAX (segs[0].y1, segs[0].y2);
+
+ for (i = 1; i < n_segs; i++)
+ {
+ gint x3 = MIN (segs[i].x1, segs[i].x2);
+ gint y3 = MIN (segs[i].y1, segs[i].y2);
+ gint x4 = MAX (segs[i].x1, segs[i].x2);
+ gint y4 = MAX (segs[i].y1, segs[i].y2);
+
+ x1 = MIN (x1, x3);
+ y1 = MIN (y1, y3);
+ x2 = MAX (x2, x4);
+ y2 = MAX (y2, y4);
+ }
+
+ g_free (segs);
+
+ rectangle.x = x1 - 2;
+ rectangle.y = y1 - 2;
+ rectangle.width = x2 - x1 + 4;
+ rectangle.height = y2 - y1 + 4;
+
+ return cairo_region_create_rectangle (&rectangle);
+}
+
+GimpCanvasItem *
+gimp_canvas_boundary_new (GimpDisplayShell *shell,
+ const GimpBoundSeg *segs,
+ gint n_segs,
+ GimpMatrix3 *transform,
+ gdouble offset_x,
+ gdouble offset_y)
+{
+ GimpCanvasItem *item;
+ GimpCanvasBoundaryPrivate *private;
+
+ g_return_val_if_fail (GIMP_IS_DISPLAY_SHELL (shell), NULL);
+
+ item = g_object_new (GIMP_TYPE_CANVAS_BOUNDARY,
+ "shell", shell,
+ "transform", transform,
+ "offset-x", offset_x,
+ "offset-y", offset_y,
+ NULL);
+ private = GET_PRIVATE (item);
+
+ /* puke */
+ private->segs = g_memdup (segs, n_segs * sizeof (GimpBoundSeg));
+ private->n_segs = n_segs;
+
+ return item;
+}