[gimp] app: add a boundary canvas item class

[Michael Natterer <mitch src gnome org>]

commit 483efcbff5b1eef70ddae73bc56de705863bd2b8
Author: Michael Natterer <mitch gimp org>
Date:   Thu Sep 23 23:38:27 2010 +0200

    app: add a boundary canvas item class
    
    This can be done much better, but this one kindof works for now.

 app/display/Makefile.am          |    2 +
 app/display/gimpcanvasboundary.c |  339 ++++++++++++++++++++++++++++++++++++++
 app/display/gimpcanvasboundary.h |   58 +++++++
 3 files changed, 399 insertions(+), 0 deletions(-)
---
diff --git a/app/display/Makefile.am b/app/display/Makefile.am
index 473eba3..35aa234 100644
--- a/app/display/Makefile.am
+++ b/app/display/Makefile.am
@@ -19,6 +19,8 @@ libappdisplay_a_sources = \
 	display-types.h				\
 	gimpcanvas.c				\
 	gimpcanvas.h				\
+	gimpcanvasboundary.c			\
+	gimpcanvasboundary.h			\
 	gimpcanvasguide.c			\
 	gimpcanvasguide.h			\
 	gimpcanvashandle.c			\
diff --git a/app/display/gimpcanvasboundary.c b/app/display/gimpcanvasboundary.c
new file mode 100644
index 0000000..6c9c989
--- /dev/null
+++ b/app/display/gimpcanvasboundary.c
@@ -0,0 +1,339 @@
+/* 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 <http://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 "base/boundary.h"
+
+#include "core/gimpparamspecs.h"
+
+#include "gimpcanvasboundary.h"
+#include "gimpdisplayshell.h"
+#include "gimpdisplayshell-transform.h"
+
+
+enum
+{
+  PROP_0,
+  PROP_SEGS,
+  PROP_OFFSET_X,
+  PROP_OFFSET_Y
+};
+
+
+typedef struct _GimpCanvasBoundaryPrivate GimpCanvasBoundaryPrivate;
+
+struct _GimpCanvasBoundaryPrivate
+{
+  BoundSeg *segs;
+  gint      n_segs;
+  gdouble   offset_x;
+  gdouble   offset_y;
+};
+
+#define GET_PRIVATE(boundary) \
+        G_TYPE_INSTANCE_GET_PRIVATE (boundary, \
+                                     GIMP_TYPE_CANVAS_BOUNDARY, \
+                                     GimpCanvasBoundaryPrivate)
+
+
+/*  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,
+                                                      GimpDisplayShell *shell,
+                                                      cairo_t          *cr);
+static GdkRegion * gimp_canvas_boundary_get_extents  (GimpCanvasItem   *item,
+                                                      GimpDisplayShell *shell);
+
+
+G_DEFINE_TYPE (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_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));
+
+  g_type_class_add_private (klass, sizeof (GimpCanvasBoundaryPrivate));
+}
+
+static void
+gimp_canvas_boundary_init (GimpCanvasBoundary *boundary)
+{
+}
+
+static void
+gimp_canvas_boundary_finalize (GObject *object)
+{
+  GimpCanvasBoundaryPrivate *private = GET_PRIVATE (object);
+
+  if (private->segs)
+    {
+      g_free (private->segs);
+      private->segs = NULL;
+      private->n_segs = 0;
+    }
+
+  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_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_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,
+                                GimpDisplayShell *shell,
+                                BoundSeg         *segs)
+{
+  GimpCanvasBoundaryPrivate *private = GET_PRIVATE (item);
+  gint                       i;
+
+  for (i = 0; i < private->n_segs; i++)
+    {
+      if (private->segs[i].x1 == -1 &&
+          private->segs[i].y1 == -1 &&
+          private->segs[i].x2 == -1 &&
+          private->segs[i].y2 == -1)
+        {
+          segs[i] = private->segs[i];
+        }
+      else
+        {
+          gimp_display_shell_transform_xy (shell,
+                                           private->segs[i].x1 +
+                                           private->offset_x,
+                                           private->segs[i].y1 +
+                                           private->offset_y,
+                                           &segs[i].x1,
+                                           &segs[i].y1);
+          gimp_display_shell_transform_xy (shell,
+                                           private->segs[i].x2 +
+                                           private->offset_x,
+                                           private->segs[i].y2 +
+                                           private->offset_y,
+                                           &segs[i].x2,
+                                           &segs[i].y2);
+        }
+    }
+}
+
+static void
+gimp_canvas_boundary_draw (GimpCanvasItem   *item,
+                           GimpDisplayShell *shell,
+                           cairo_t          *cr)
+{
+  GimpCanvasBoundaryPrivate *private = GET_PRIVATE (item);
+  BoundSeg                  *segs;
+  gint                       i;
+
+  segs = g_new0 (BoundSeg, private->n_segs);
+
+  gimp_canvas_boundary_transform (item, shell, segs);
+
+  cairo_move_to (cr, segs[0].x1 + 0.5, segs[0].y1 + 0.5);
+
+  for (i = 1; i < private->n_segs; i++)
+    {
+      if (segs[i].x1 == -1 &&
+          segs[i].y1 == -1 &&
+          segs[i].x2 == -1 &&
+          segs[i].y2 == -1)
+        {
+          cairo_close_path (cr);
+          _gimp_canvas_item_stroke (item, shell, cr);
+
+          i++;
+          if (i == private->n_segs)
+            break;
+
+          cairo_move_to (cr, segs[i].x1 + 0.5, segs[i].y1 + 0.5);
+        }
+      else
+        {
+          cairo_line_to (cr, segs[i].x1 + 0.5, segs[i].y1 + 0.5);
+        }
+    }
+
+  cairo_close_path (cr);
+  _gimp_canvas_item_stroke (item, shell, cr);
+
+  g_free (segs);
+}
+
+static GdkRegion *
+gimp_canvas_boundary_get_extents (GimpCanvasItem   *item,
+                                  GimpDisplayShell *shell)
+{
+  GimpCanvasBoundaryPrivate *private = GET_PRIVATE (item);
+  GdkRectangle               rectangle;
+  BoundSeg                  *segs;
+  gint                       x1, y1, x2, y2;
+  gint                       i;
+
+  segs = g_new0 (BoundSeg, private->n_segs);
+
+  gimp_canvas_boundary_transform (item, shell, segs);
+
+  x1 = segs[0].x1 - 1;
+  y1 = segs[0].y1 - 1;
+  x2 = x1 + 3;
+  y2 = y1 + 3;
+
+  for (i = 1; i < private->n_segs; i++)
+    {
+      if (segs[i].x1 != -1 ||
+          segs[i].y1 != -1 ||
+          segs[i].x2 != -1 ||
+          segs[i].y2 != -1)
+        {
+          gint x3 = segs[i].x1 - 1;
+          gint y3 = segs[i].y1 - 1;
+          gint x4 = x3 + 3;
+          gint y4 = y3 + 3;
+
+          x1 = MIN (x1, x3);
+          y1 = MIN (y1, y3);
+          x2 = MAX (x2, x4);
+          y2 = MAX (y2, y4);
+        }
+    }
+
+  g_free (segs);
+
+  rectangle.x      = x1;
+  rectangle.y      = y1;
+  rectangle.width  = x2 - x1;
+  rectangle.height = y2 - y1;
+
+  return gdk_region_rectangle (&rectangle);
+}
+
+GimpCanvasItem *
+gimp_canvas_boundary_new (const BoundSeg *segs,
+                          gint            n_segs,
+                          gdouble         offset_x,
+                          gdouble         offset_y)
+{
+  GimpCanvasItem            *item;
+  GimpCanvasBoundaryPrivate *private;
+
+  item = g_object_new (GIMP_TYPE_CANVAS_BOUNDARY,
+                       "offset-x", offset_x,
+                       "offset-y", offset_y,
+                       NULL);
+  private = GET_PRIVATE (item);
+
+  /* puke */
+  private->segs   = g_memdup (segs, n_segs * sizeof (BoundSeg));
+  private->n_segs = n_segs;
+
+  return item;
+}
diff --git a/app/display/gimpcanvasboundary.h b/app/display/gimpcanvasboundary.h
new file mode 100644
index 0000000..e094c62
--- /dev/null
+++ b/app/display/gimpcanvasboundary.h
@@ -0,0 +1,58 @@
+/* GIMP - The GNU Image Manipulation Program Copyright (C) 1995
+ * Spencer Kimball and Peter Mattis
+ *
+ * gimpcanvasboundary.h
+ * 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 <http://www.gnu.org/licenses/>.
+ */
+
+#ifndef __GIMP_CANVAS_BOUNDARY_H__
+#define __GIMP_CANVAS_BOUNDARY_H__
+
+
+#include "gimpcanvasitem.h"
+
+
+#define GIMP_TYPE_CANVAS_BOUNDARY            (gimp_canvas_boundary_get_type ())
+#define GIMP_CANVAS_BOUNDARY(obj)            (G_TYPE_CHECK_INSTANCE_CAST ((obj), GIMP_TYPE_CANVAS_BOUNDARY, GimpCanvasBoundary))
+#define GIMP_CANVAS_BOUNDARY_CLASS(klass)    (G_TYPE_CHECK_CLASS_CAST ((klass), GIMP_TYPE_CANVAS_BOUNDARY, GimpCanvasBoundaryClass))
+#define GIMP_IS_CANVAS_BOUNDARY(obj)         (G_TYPE_CHECK_INSTANCE_TYPE ((obj), GIMP_TYPE_CANVAS_BOUNDARY))
+#define GIMP_IS_CANVAS_BOUNDARY_CLASS(klass) (G_TYPE_CHECK_CLASS_TYPE ((klass), GIMP_TYPE_CANVAS_BOUNDARY))
+#define GIMP_CANVAS_BOUNDARY_GET_CLASS(obj)  (G_TYPE_INSTANCE_GET_CLASS ((obj), GIMP_TYPE_CANVAS_BOUNDARY, GimpCanvasBoundaryClass))
+
+
+typedef struct _GimpCanvasBoundary      GimpCanvasBoundary;
+typedef struct _GimpCanvasBoundaryClass GimpCanvasBoundaryClass;
+
+struct _GimpCanvasBoundary
+{
+  GimpCanvasItem  parent_instance;
+};
+
+struct _GimpCanvasBoundaryClass
+{
+  GimpCanvasItemClass  parent_class;
+};
+
+
+GType            gimp_canvas_boundary_get_type (void) G_GNUC_CONST;
+
+GimpCanvasItem * gimp_canvas_boundary_new      (const BoundSeg *segs,
+                                                gint            n_segs,
+                                                gdouble         offset_x,
+                                                gdouble         offset_y);
+
+
+#endif /* __GIMP_CANVAS_BOUNDARY_H__ */