Adding upstream version 2.10.36.upstream/2.10.36

Signed-off-by: Daniel Baumann <daniel.baumann@progress-linux.org>

1 files changed, 731 insertions, 0 deletions

diff --git a/app/display/gimpcanvasitem.c b/app/display/gimpcanvasitem.c
new file mode 100644
index 0000000..560210a
--- /dev/null
+++ b/app/display/gimpcanvasitem.c
@@ -0,0 +1,731 @@
+/* GIMP - The GNU Image Manipulation Program
+ * Copyright (C) 1995 Spencer Kimball and Peter Mattis
+ *
+ * gimpcanvasitem.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 "libgimpmath/gimpmath.h"
+
+#include "display-types.h"
+
+#include "core/gimpmarshal.h"
+
+#include "gimpcanvas-style.h"
+#include "gimpcanvasitem.h"
+#include "gimpdisplay.h"
+#include "gimpdisplayshell.h"
+#include "gimpdisplayshell-transform.h"
+
+
+enum
+{
+  PROP_0,
+  PROP_SHELL,
+  PROP_VISIBLE,
+  PROP_LINE_CAP,
+  PROP_HIGHLIGHT
+};
+
+enum
+{
+  UPDATE,
+  LAST_SIGNAL
+};
+
+
+struct _GimpCanvasItemPrivate
+{
+  GimpDisplayShell *shell;
+  gboolean          visible;
+  cairo_line_cap_t  line_cap;
+  gboolean          highlight;
+  gint              suspend_stroking;
+  gint              suspend_filling;
+  gint              change_count;
+  cairo_region_t   *change_region;
+};
+
+
+/*  local function prototypes  */
+
+static void             gimp_canvas_item_dispose          (GObject         *object);
+static void             gimp_canvas_item_constructed      (GObject         *object);
+static void             gimp_canvas_item_set_property     (GObject         *object,
+                                                           guint            property_id,
+                                                           const GValue    *value,
+                                                           GParamSpec      *pspec);
+static void             gimp_canvas_item_get_property     (GObject         *object,
+                                                           guint            property_id,
+                                                           GValue          *value,
+                                                           GParamSpec      *pspec);
+static void  gimp_canvas_item_dispatch_properties_changed (GObject         *object,
+                                                           guint            n_pspecs,
+                                                           GParamSpec     **pspecs);
+
+static void             gimp_canvas_item_real_draw        (GimpCanvasItem  *item,
+                                                           cairo_t         *cr);
+static cairo_region_t * gimp_canvas_item_real_get_extents (GimpCanvasItem  *item);
+static void             gimp_canvas_item_real_stroke      (GimpCanvasItem  *item,
+                                                           cairo_t         *cr);
+static void             gimp_canvas_item_real_fill        (GimpCanvasItem  *item,
+                                                           cairo_t         *cr);
+static gboolean         gimp_canvas_item_real_hit         (GimpCanvasItem  *item,
+                                                           gdouble          x,
+                                                           gdouble          y);
+
+
+G_DEFINE_TYPE_WITH_PRIVATE (GimpCanvasItem, gimp_canvas_item, GIMP_TYPE_OBJECT)
+
+#define parent_class gimp_canvas_item_parent_class
+
+static guint item_signals[LAST_SIGNAL] = { 0 };
+
+
+static void
+gimp_canvas_item_class_init (GimpCanvasItemClass *klass)
+{
+  GObjectClass *object_class = G_OBJECT_CLASS (klass);
+
+  object_class->dispose                     = gimp_canvas_item_dispose;
+  object_class->constructed                 = gimp_canvas_item_constructed;
+  object_class->set_property                = gimp_canvas_item_set_property;
+  object_class->get_property                = gimp_canvas_item_get_property;
+  object_class->dispatch_properties_changed = gimp_canvas_item_dispatch_properties_changed;
+
+  klass->update                             = NULL;
+  klass->draw                               = gimp_canvas_item_real_draw;
+  klass->get_extents                        = gimp_canvas_item_real_get_extents;
+  klass->stroke                             = gimp_canvas_item_real_stroke;
+  klass->fill                               = gimp_canvas_item_real_fill;
+  klass->hit                                = gimp_canvas_item_real_hit;
+
+  item_signals[UPDATE] =
+    g_signal_new ("update",
+                  G_TYPE_FROM_CLASS (klass),
+                  G_SIGNAL_RUN_FIRST,
+                  G_STRUCT_OFFSET (GimpCanvasItemClass, update),
+                  NULL, NULL,
+                  gimp_marshal_VOID__POINTER,
+                  G_TYPE_NONE, 1,
+                  G_TYPE_POINTER);
+
+  g_object_class_install_property (object_class, PROP_SHELL,
+                                   g_param_spec_object ("shell",
+                                                        NULL, NULL,
+                                                        GIMP_TYPE_DISPLAY_SHELL,
+                                                        GIMP_PARAM_READWRITE |
+                                                        G_PARAM_CONSTRUCT_ONLY));
+
+  g_object_class_install_property (object_class, PROP_VISIBLE,
+                                   g_param_spec_boolean ("visible",
+                                                         NULL, NULL,
+                                                         TRUE,
+                                                         GIMP_PARAM_READWRITE));
+
+  g_object_class_install_property (object_class, PROP_LINE_CAP,
+                                   g_param_spec_int ("line-cap",
+                                                     NULL, NULL,
+                                                     CAIRO_LINE_CAP_BUTT,
+                                                     CAIRO_LINE_CAP_SQUARE,
+                                                     CAIRO_LINE_CAP_ROUND,
+                                                     GIMP_PARAM_READWRITE));
+
+  g_object_class_install_property (object_class, PROP_HIGHLIGHT,
+                                   g_param_spec_boolean ("highlight",
+                                                         NULL, NULL,
+                                                         FALSE,
+                                                         GIMP_PARAM_READWRITE));
+}
+
+static void
+gimp_canvas_item_init (GimpCanvasItem *item)
+{
+  GimpCanvasItemPrivate *private;
+
+  item->private = gimp_canvas_item_get_instance_private (item);
+  private = item->private;
+
+  private->shell            = NULL;
+  private->visible          = TRUE;
+  private->line_cap         = CAIRO_LINE_CAP_ROUND;
+  private->highlight        = FALSE;
+  private->suspend_stroking = 0;
+  private->suspend_filling  = 0;
+  private->change_count     = 1; /* avoid emissions during construction */
+  private->change_region    = NULL;
+}
+
+static void
+gimp_canvas_item_constructed (GObject *object)
+{
+  GimpCanvasItem *item = GIMP_CANVAS_ITEM (object);
+
+  gimp_assert (GIMP_IS_DISPLAY_SHELL (item->private->shell));
+
+  item->private->change_count = 0; /* undo hack from init() */
+
+  G_OBJECT_CLASS (parent_class)->constructed (object);
+}
+
+static void
+gimp_canvas_item_dispose (GObject *object)
+{
+  GimpCanvasItem *item = GIMP_CANVAS_ITEM (object);
+
+  item->private->change_count++; /* avoid emissions during destruction */
+
+  G_OBJECT_CLASS (parent_class)->dispose (object);
+}
+
+static void
+gimp_canvas_item_set_property (GObject      *object,
+                               guint         property_id,
+                               const GValue *value,
+                               GParamSpec   *pspec)
+{
+  GimpCanvasItem        *item    = GIMP_CANVAS_ITEM (object);
+  GimpCanvasItemPrivate *private = item->private;
+
+  switch (property_id)
+    {
+    case PROP_SHELL:
+      private->shell = g_value_get_object (value); /* don't ref */
+      break;
+    case PROP_VISIBLE:
+      private->visible = g_value_get_boolean (value);
+      break;
+    case PROP_LINE_CAP:
+      private->line_cap = g_value_get_int (value);
+      break;
+    case PROP_HIGHLIGHT:
+      private->highlight = g_value_get_boolean (value);
+      break;
+
+    default:
+      G_OBJECT_WARN_INVALID_PROPERTY_ID (object, property_id, pspec);
+      break;
+    }
+}
+
+static void
+gimp_canvas_item_get_property (GObject    *object,
+                               guint       property_id,
+                               GValue     *value,
+                               GParamSpec *pspec)
+{
+  GimpCanvasItem        *item    = GIMP_CANVAS_ITEM (object);
+  GimpCanvasItemPrivate *private = item->private;
+
+  switch (property_id)
+    {
+    case PROP_SHELL:
+      g_value_set_object (value, private->shell);
+      break;
+    case PROP_VISIBLE:
+      g_value_set_boolean (value, private->visible);
+      break;
+    case PROP_LINE_CAP:
+      g_value_set_int (value, private->line_cap);
+      break;
+    case PROP_HIGHLIGHT:
+      g_value_set_boolean (value, private->highlight);
+      break;
+
+    default:
+      G_OBJECT_WARN_INVALID_PROPERTY_ID (object, property_id, pspec);
+      break;
+    }
+}
+
+static void
+gimp_canvas_item_dispatch_properties_changed (GObject     *object,
+                                              guint        n_pspecs,
+                                              GParamSpec **pspecs)
+{
+  GimpCanvasItem *item = GIMP_CANVAS_ITEM (object);
+
+  G_OBJECT_CLASS (parent_class)->dispatch_properties_changed (object,
+                                                              n_pspecs,
+                                                              pspecs);
+
+  if (_gimp_canvas_item_needs_update (item))
+    {
+      cairo_region_t *region = gimp_canvas_item_get_extents (item);
+
+      if (region)
+        {
+          g_signal_emit (object, item_signals[UPDATE], 0,
+                         region);
+          cairo_region_destroy (region);
+        }
+    }
+}
+
+static void
+gimp_canvas_item_real_draw (GimpCanvasItem *item,
+                            cairo_t        *cr)
+{
+  g_warn_if_reached ();
+}
+
+static cairo_region_t *
+gimp_canvas_item_real_get_extents (GimpCanvasItem *item)
+{
+  return NULL;
+}
+
+static void
+gimp_canvas_item_real_stroke (GimpCanvasItem *item,
+                              cairo_t        *cr)
+{
+  cairo_set_line_cap (cr, item->private->line_cap);
+
+  gimp_canvas_set_tool_bg_style (gimp_canvas_item_get_canvas (item), cr);
+  cairo_stroke_preserve (cr);
+
+  gimp_canvas_set_tool_fg_style (gimp_canvas_item_get_canvas (item), cr,
+                                 item->private->highlight);
+  cairo_stroke (cr);
+}
+
+static void
+gimp_canvas_item_real_fill (GimpCanvasItem *item,
+                            cairo_t        *cr)
+{
+  gimp_canvas_set_tool_bg_style (gimp_canvas_item_get_canvas (item), cr);
+  cairo_set_line_width (cr, 2.0);
+  cairo_stroke_preserve (cr);
+
+  gimp_canvas_set_tool_fg_style (gimp_canvas_item_get_canvas (item), cr,
+                                 item->private->highlight);
+  cairo_fill (cr);
+}
+
+static gboolean
+gimp_canvas_item_real_hit (GimpCanvasItem *item,
+                           gdouble         x,
+                           gdouble         y)
+{
+  return FALSE;
+}
+
+
+/*  public functions  */
+
+GimpDisplayShell *
+gimp_canvas_item_get_shell (GimpCanvasItem *item)
+{
+  g_return_val_if_fail (GIMP_IS_CANVAS_ITEM (item), NULL);
+
+  return item->private->shell;
+}
+
+GimpImage *
+gimp_canvas_item_get_image (GimpCanvasItem *item)
+{
+  g_return_val_if_fail (GIMP_IS_CANVAS_ITEM (item), NULL);
+
+  return gimp_display_get_image (item->private->shell->display);
+}
+
+GtkWidget *
+gimp_canvas_item_get_canvas (GimpCanvasItem *item)
+{
+  g_return_val_if_fail (GIMP_IS_CANVAS_ITEM (item), NULL);
+
+  return item->private->shell->canvas;
+}
+
+void
+gimp_canvas_item_draw (GimpCanvasItem *item,
+                       cairo_t        *cr)
+{
+  g_return_if_fail (GIMP_IS_CANVAS_ITEM (item));
+  g_return_if_fail (cr != NULL);
+
+  if (item->private->visible)
+    {
+      cairo_save (cr);
+      GIMP_CANVAS_ITEM_GET_CLASS (item)->draw (item, cr);
+      cairo_restore (cr);
+    }
+}
+
+cairo_region_t *
+gimp_canvas_item_get_extents (GimpCanvasItem *item)
+{
+  g_return_val_if_fail (GIMP_IS_CANVAS_ITEM (item), NULL);
+
+  if (item->private->visible)
+    return GIMP_CANVAS_ITEM_GET_CLASS (item)->get_extents (item);
+
+  return NULL;
+}
+
+gboolean
+gimp_canvas_item_hit (GimpCanvasItem   *item,
+                      gdouble           x,
+                      gdouble           y)
+{
+  g_return_val_if_fail (GIMP_IS_CANVAS_ITEM (item), FALSE);
+
+  if (item->private->visible)
+    return GIMP_CANVAS_ITEM_GET_CLASS (item)->hit (item, x, y);
+
+  return FALSE;
+}
+
+void
+gimp_canvas_item_set_visible (GimpCanvasItem *item,
+                              gboolean        visible)
+{
+  g_return_if_fail (GIMP_IS_CANVAS_ITEM (item));
+
+  if (item->private->visible != visible)
+    {
+      gimp_canvas_item_begin_change (item);
+      g_object_set (G_OBJECT (item),
+                    "visible", visible,
+                    NULL);
+      gimp_canvas_item_end_change (item);
+    }
+}
+
+gboolean
+gimp_canvas_item_get_visible (GimpCanvasItem *item)
+{
+  g_return_val_if_fail (GIMP_IS_CANVAS_ITEM (item), FALSE);
+
+  return item->private->visible;
+}
+
+void
+gimp_canvas_item_set_line_cap (GimpCanvasItem   *item,
+                               cairo_line_cap_t  line_cap)
+{
+  g_return_if_fail (GIMP_IS_CANVAS_ITEM (item));
+
+  if (item->private->line_cap != line_cap)
+    {
+      gimp_canvas_item_begin_change (item);
+      g_object_set (G_OBJECT (item),
+                    "line-cap", line_cap,
+                    NULL);
+      gimp_canvas_item_end_change (item);
+    }
+}
+
+void
+gimp_canvas_item_set_highlight (GimpCanvasItem *item,
+                                gboolean        highlight)
+{
+  g_return_if_fail (GIMP_IS_CANVAS_ITEM (item));
+
+  if (item->private->highlight != highlight)
+    {
+      g_object_set (G_OBJECT (item),
+                    "highlight", highlight,
+                    NULL);
+    }
+}
+
+gboolean
+gimp_canvas_item_get_highlight (GimpCanvasItem *item)
+{
+  g_return_val_if_fail (GIMP_IS_CANVAS_ITEM (item), FALSE);
+
+  return item->private->highlight;
+}
+
+void
+gimp_canvas_item_begin_change (GimpCanvasItem *item)
+{
+  GimpCanvasItemPrivate *private;
+
+  g_return_if_fail (GIMP_IS_CANVAS_ITEM (item));
+
+  private = item->private;
+
+  private->change_count++;
+
+  if (private->change_count == 1 &&
+      g_signal_has_handler_pending (item, item_signals[UPDATE], 0, FALSE))
+    {
+      private->change_region = gimp_canvas_item_get_extents (item);
+    }
+}
+
+void
+gimp_canvas_item_end_change (GimpCanvasItem *item)
+{
+  GimpCanvasItemPrivate *private;
+
+  g_return_if_fail (GIMP_IS_CANVAS_ITEM (item));
+
+  private = item->private;
+
+  g_return_if_fail (private->change_count > 0);
+
+  private->change_count--;
+
+  if (private->change_count == 0)
+    {
+      if (g_signal_has_handler_pending (item, item_signals[UPDATE], 0, FALSE))
+        {
+          cairo_region_t *region = gimp_canvas_item_get_extents (item);
+
+          if (! region)
+            {
+              region = private->change_region;
+            }
+          else if (private->change_region)
+            {
+              cairo_region_union (region, private->change_region);
+              cairo_region_destroy (private->change_region);
+            }
+
+          private->change_region = NULL;
+
+          if (region)
+            {
+              g_signal_emit (item, item_signals[UPDATE], 0,
+                             region);
+              cairo_region_destroy (region);
+            }
+        }
+      else
+        {
+          g_clear_pointer (&private->change_region, cairo_region_destroy);
+        }
+    }
+}
+
+void
+gimp_canvas_item_suspend_stroking (GimpCanvasItem *item)
+{
+  g_return_if_fail (GIMP_IS_CANVAS_ITEM (item));
+
+  item->private->suspend_stroking++;
+}
+
+void
+gimp_canvas_item_resume_stroking (GimpCanvasItem *item)
+{
+  g_return_if_fail (GIMP_IS_CANVAS_ITEM (item));
+
+  g_return_if_fail (item->private->suspend_stroking > 0);
+
+  item->private->suspend_stroking--;
+}
+
+void
+gimp_canvas_item_suspend_filling (GimpCanvasItem *item)
+{
+  g_return_if_fail (GIMP_IS_CANVAS_ITEM (item));
+
+  item->private->suspend_filling++;
+}
+
+void
+gimp_canvas_item_resume_filling (GimpCanvasItem *item)
+{
+  g_return_if_fail (GIMP_IS_CANVAS_ITEM (item));
+
+  g_return_if_fail (item->private->suspend_filling > 0);
+
+  item->private->suspend_filling--;
+}
+
+void
+gimp_canvas_item_transform (GimpCanvasItem *item,
+                            cairo_t        *cr)
+{
+  GimpCanvasItemPrivate *private;
+
+  g_return_if_fail (GIMP_IS_CANVAS_ITEM (item));
+  g_return_if_fail (cr != NULL);
+
+  private = item->private;
+
+  cairo_translate (cr, -private->shell->offset_x, -private->shell->offset_y);
+  cairo_scale (cr, private->shell->scale_x, private->shell->scale_y);
+}
+
+void
+gimp_canvas_item_transform_xy (GimpCanvasItem *item,
+                               gdouble         x,
+                               gdouble         y,
+                               gint           *tx,
+                               gint           *ty)
+{
+  g_return_if_fail (GIMP_IS_CANVAS_ITEM (item));
+
+  gimp_display_shell_zoom_xy (item->private->shell, x, y, tx, ty);
+}
+
+void
+gimp_canvas_item_transform_xy_f (GimpCanvasItem *item,
+                                 gdouble         x,
+                                 gdouble         y,
+                                 gdouble        *tx,
+                                 gdouble        *ty)
+{
+  g_return_if_fail (GIMP_IS_CANVAS_ITEM (item));
+
+  gimp_display_shell_zoom_xy_f (item->private->shell, x, y, tx, ty);
+}
+
+/**
+ * gimp_canvas_item_transform_distance:
+ * @item: a #GimpCanvasItem
+ * @x1:   start point X in image coordinates
+ * @y1:   start point Y in image coordinates
+ * @x2:   end point X in image coordinates
+ * @y2:   end point Y in image coordinates
+ *
+ * If you just need to compare distances, consider to use
+ * gimp_canvas_item_transform_distance_square() instead.
+ *
+ * Returns: the distance between the given points in display coordinates
+ **/
+gdouble
+gimp_canvas_item_transform_distance (GimpCanvasItem *item,
+                                     gdouble         x1,
+                                     gdouble         y1,
+                                     gdouble         x2,
+                                     gdouble         y2)
+{
+  return sqrt (gimp_canvas_item_transform_distance_square (item,
+                                                           x1, y1, x2, y2));
+}
+
+/**
+ * gimp_canvas_item_transform_distance_square:
+ * @item: a #GimpCanvasItem
+ * @x1:   start point X in image coordinates
+ * @y1:   start point Y in image coordinates
+ * @x2:   end point X in image coordinates
+ * @y2:   end point Y in image coordinates
+ *
+ * This function is more effective than
+ * gimp_canvas_item_transform_distance() as it doesn't perform a
+ * sqrt(). Use this if you just need to compare distances.
+ *
+ * Returns: the square of the distance between the given points in
+ *          display coordinates
+ **/
+gdouble
+gimp_canvas_item_transform_distance_square (GimpCanvasItem   *item,
+                                            gdouble           x1,
+                                            gdouble           y1,
+                                            gdouble           x2,
+                                            gdouble           y2)
+{
+  gdouble tx1, ty1;
+  gdouble tx2, ty2;
+
+  g_return_val_if_fail (GIMP_IS_CANVAS_ITEM (item), 0.0);
+
+  gimp_canvas_item_transform_xy_f (item, x1, y1, &tx1, &ty1);
+  gimp_canvas_item_transform_xy_f (item, x2, y2, &tx2, &ty2);
+
+  return SQR (tx2 - tx1) + SQR (ty2 - ty1);
+}
+
+void
+gimp_canvas_item_untransform_viewport (GimpCanvasItem *item,
+                                       gint           *x,
+                                       gint           *y,
+                                       gint           *w,
+                                       gint           *h)
+{
+  GimpDisplayShell *shell;
+  gdouble           x1, y1;
+  gdouble           x2, y2;
+
+  g_return_if_fail (GIMP_IS_CANVAS_ITEM (item));
+
+  shell = item->private->shell;
+
+  gimp_display_shell_unrotate_bounds (shell,
+                                      0.0,               0.0,
+                                      shell->disp_width, shell->disp_height,
+                                      &x1,               &y1,
+                                      &x2,               &y2);
+
+  *x = floor (x1);
+  *y = floor (y1);
+  *w = ceil  (x2) - *x;
+  *h = ceil  (y2) - *y;
+}
+
+
+/*  protected functions  */
+
+void
+_gimp_canvas_item_update (GimpCanvasItem *item,
+                          cairo_region_t *region)
+{
+  g_signal_emit (item, item_signals[UPDATE], 0,
+                 region);
+}
+
+gboolean
+_gimp_canvas_item_needs_update (GimpCanvasItem *item)
+{
+  return (item->private->change_count == 0 &&
+          g_signal_has_handler_pending (item, item_signals[UPDATE], 0, FALSE));
+}
+
+void
+_gimp_canvas_item_stroke (GimpCanvasItem *item,
+                          cairo_t        *cr)
+{
+  if (item->private->suspend_filling > 0)
+    g_warning ("_gimp_canvas_item_stroke() on an item that is in a filling group");
+
+  if (item->private->suspend_stroking == 0)
+    {
+      GIMP_CANVAS_ITEM_GET_CLASS (item)->stroke (item, cr);
+    }
+  else
+    {
+      cairo_new_sub_path (cr);
+    }
+}
+
+void
+_gimp_canvas_item_fill (GimpCanvasItem *item,
+                        cairo_t        *cr)
+{
+  if (item->private->suspend_stroking > 0)
+    g_warning ("_gimp_canvas_item_fill() on an item that is in a stroking group");
+
+  if (item->private->suspend_filling == 0)
+    {
+      GIMP_CANVAS_ITEM_GET_CLASS (item)->fill (item, cr);
+    }
+  else
+    {
+      cairo_new_sub_path (cr);
+    }
+}