Adding upstream version 2.10.22.upstream/2.10.22upstream

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

1 files changed, 505 insertions, 0 deletions

diff --git a/app/display/gimpdisplayshell-selection.c b/app/display/gimpdisplayshell-selection.c
new file mode 100644
index 0000000..3098ddc
--- /dev/null
+++ b/app/display/gimpdisplayshell-selection.c
@@ -0,0 +1,505 @@
+/* GIMP - The GNU Image Manipulation Program
+ * Copyright (C) 1995 Spencer Kimball and Peter Mattis
+ *
+ * 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 "display-types.h"
+
+#include "config/gimpdisplayconfig.h"
+
+#include "core/gimp.h"
+#include "core/gimp-cairo.h"
+#include "core/gimpboundary.h"
+#include "core/gimpchannel.h"
+#include "core/gimpimage.h"
+
+#include "gimpdisplay.h"
+#include "gimpdisplayshell.h"
+#include "gimpdisplayshell-appearance.h"
+#include "gimpdisplayshell-draw.h"
+#include "gimpdisplayshell-expose.h"
+#include "gimpdisplayshell-selection.h"
+#include "gimpdisplayshell-transform.h"
+
+
+struct _Selection
+{
+  GimpDisplayShell *shell;            /*  shell that owns the selection     */
+
+  GimpSegment      *segs_in;          /*  gdk segments of area boundary     */
+  gint              n_segs_in;        /*  number of segments in segs_in     */
+
+  GimpSegment      *segs_out;         /*  gdk segments of area boundary     */
+  gint              n_segs_out;       /*  number of segments in segs_out    */
+
+  guint             index;            /*  index of current stipple pattern  */
+  gint              paused;           /*  count of pause requests           */
+  gboolean          shell_visible;    /*  visility of the display shell     */
+  gboolean          show_selection;   /*  is the selection visible?         */
+  guint             timeout;          /*  timer for successive draws        */
+  cairo_pattern_t  *segs_in_mask;     /*  cache for rendered segments       */
+};
+
+
+/*  local function prototypes  */
+
+static void      selection_start          (Selection          *selection);
+static void      selection_stop           (Selection          *selection);
+
+static void      selection_draw           (Selection          *selection,
+                                           cairo_t            *cr);
+static void      selection_undraw         (Selection          *selection);
+
+static void      selection_render_mask    (Selection          *selection);
+
+static void      selection_zoom_segs      (Selection          *selection,
+                                           const GimpBoundSeg *src_segs,
+                                           GimpSegment        *dest_segs,
+                                           gint                n_segs);
+static void      selection_generate_segs  (Selection          *selection);
+static void      selection_free_segs      (Selection          *selection);
+
+static gboolean  selection_start_timeout  (Selection          *selection);
+static gboolean  selection_timeout        (Selection          *selection);
+
+static gboolean  selection_window_state_event      (GtkWidget           *shell,
+                                                    GdkEventWindowState *event,
+                                                    Selection           *selection);
+static gboolean  selection_visibility_notify_event (GtkWidget           *shell,
+                                                    GdkEventVisibility  *event,
+                                                    Selection           *selection);
+
+
+/*  public functions  */
+
+void
+gimp_display_shell_selection_init (GimpDisplayShell *shell)
+{
+  Selection *selection;
+
+  g_return_if_fail (GIMP_IS_DISPLAY_SHELL (shell));
+  g_return_if_fail (shell->selection == NULL);
+
+  selection = g_slice_new0 (Selection);
+
+  selection->shell          = shell;
+  selection->shell_visible  = TRUE;
+  selection->show_selection = gimp_display_shell_get_show_selection (shell);
+
+  shell->selection = selection;
+
+  g_signal_connect (shell, "window-state-event",
+                    G_CALLBACK (selection_window_state_event),
+                    selection);
+  g_signal_connect (shell, "visibility-notify-event",
+                    G_CALLBACK (selection_visibility_notify_event),
+                    selection);
+}
+
+void
+gimp_display_shell_selection_free (GimpDisplayShell *shell)
+{
+  Selection *selection;
+
+  g_return_if_fail (GIMP_IS_DISPLAY_SHELL (shell));
+  g_return_if_fail (shell->selection != NULL);
+
+  selection = shell->selection;
+
+  selection_stop (selection);
+
+  g_signal_handlers_disconnect_by_func (shell,
+                                        selection_window_state_event,
+                                        selection);
+  g_signal_handlers_disconnect_by_func (shell,
+                                        selection_visibility_notify_event,
+                                        selection);
+
+  selection_free_segs (selection);
+
+  g_slice_free (Selection, selection);
+
+  shell->selection = NULL;
+}
+
+void
+gimp_display_shell_selection_undraw (GimpDisplayShell *shell)
+{
+  g_return_if_fail (GIMP_IS_DISPLAY_SHELL (shell));
+  g_return_if_fail (shell->selection != NULL);
+
+  if (gimp_display_get_image (shell->display))
+    {
+      selection_undraw (shell->selection);
+    }
+  else
+    {
+      selection_stop (shell->selection);
+      selection_free_segs (shell->selection);
+    }
+}
+
+void
+gimp_display_shell_selection_restart (GimpDisplayShell *shell)
+{
+  g_return_if_fail (GIMP_IS_DISPLAY_SHELL (shell));
+  g_return_if_fail (shell->selection != NULL);
+
+  if (gimp_display_get_image (shell->display))
+    {
+      selection_start (shell->selection);
+    }
+}
+
+void
+gimp_display_shell_selection_pause (GimpDisplayShell *shell)
+{
+  g_return_if_fail (GIMP_IS_DISPLAY_SHELL (shell));
+  g_return_if_fail (shell->selection != NULL);
+
+  if (gimp_display_get_image (shell->display))
+    {
+      if (shell->selection->paused == 0)
+        selection_stop (shell->selection);
+
+      shell->selection->paused++;
+    }
+}
+
+void
+gimp_display_shell_selection_resume (GimpDisplayShell *shell)
+{
+  g_return_if_fail (GIMP_IS_DISPLAY_SHELL (shell));
+  g_return_if_fail (shell->selection != NULL);
+
+  if (gimp_display_get_image (shell->display))
+    {
+      shell->selection->paused--;
+
+      if (shell->selection->paused == 0)
+        selection_start (shell->selection);
+    }
+}
+
+void
+gimp_display_shell_selection_set_show (GimpDisplayShell *shell,
+                                       gboolean          show)
+{
+  g_return_if_fail (GIMP_IS_DISPLAY_SHELL (shell));
+  g_return_if_fail (shell->selection != NULL);
+
+  if (gimp_display_get_image (shell->display))
+    {
+      Selection *selection = shell->selection;
+
+      if (show != selection->show_selection)
+        {
+          selection_undraw (selection);
+
+          selection->show_selection = show;
+
+          selection_start (selection);
+        }
+    }
+}
+
+
+/*  private functions  */
+
+static void
+selection_start (Selection *selection)
+{
+  selection_stop (selection);
+
+  /*  If this selection is paused, do not start it  */
+  if (selection->paused == 0)
+    {
+      selection->timeout = g_idle_add ((GSourceFunc) selection_start_timeout,
+                                       selection);
+    }
+}
+
+static void
+selection_stop (Selection *selection)
+{
+  if (selection->timeout)
+    {
+      g_source_remove (selection->timeout);
+      selection->timeout = 0;
+    }
+}
+
+static void
+selection_draw (Selection *selection,
+                cairo_t   *cr)
+{
+  if (selection->segs_in)
+    {
+      gimp_display_shell_draw_selection_in (selection->shell, cr,
+                                            selection->segs_in_mask,
+                                            selection->index % 8);
+    }
+}
+
+static void
+selection_undraw (Selection *selection)
+{
+  gint x, y, w, h;
+
+  selection_stop (selection);
+
+  if (gimp_display_shell_mask_bounds (selection->shell, &x, &y, &w, &h))
+    {
+      /* expose will restart the selection */
+      gimp_display_shell_expose_area (selection->shell, x, y, w, h);
+    }
+  else
+    {
+      selection_start (selection);
+    }
+}
+
+static void
+selection_render_mask (Selection *selection)
+{
+  GdkWindow       *window;
+  cairo_surface_t *surface;
+  cairo_t         *cr;
+
+  window = gtk_widget_get_window (selection->shell->canvas);
+  surface = gdk_window_create_similar_surface (window, CAIRO_CONTENT_ALPHA,
+                                               gdk_window_get_width  (window),
+                                               gdk_window_get_height (window));
+  cr = cairo_create (surface);
+
+  cairo_set_line_cap (cr, CAIRO_LINE_CAP_SQUARE);
+  cairo_set_line_width (cr, 1.0);
+
+  if (selection->shell->rotate_transform)
+    cairo_transform (cr, selection->shell->rotate_transform);
+
+  gimp_cairo_segments (cr,
+                       selection->segs_in,
+                       selection->n_segs_in);
+  cairo_stroke (cr);
+
+  selection->segs_in_mask = cairo_pattern_create_for_surface (surface);
+
+  cairo_destroy (cr);
+  cairo_surface_destroy (surface);
+}
+
+static void
+selection_zoom_segs (Selection          *selection,
+                     const GimpBoundSeg *src_segs,
+                     GimpSegment        *dest_segs,
+                     gint                n_segs)
+{
+  const gint xclamp = selection->shell->disp_width + 1;
+  const gint yclamp = selection->shell->disp_height + 1;
+  gint       i;
+
+  gimp_display_shell_zoom_segments (selection->shell,
+                                    src_segs, dest_segs, n_segs,
+                                    0.0, 0.0);
+
+  for (i = 0; i < n_segs; i++)
+    {
+      if (! selection->shell->rotate_transform)
+        {
+          dest_segs[i].x1 = CLAMP (dest_segs[i].x1, -1, xclamp);
+          dest_segs[i].y1 = CLAMP (dest_segs[i].y1, -1, yclamp);
+
+          dest_segs[i].x2 = CLAMP (dest_segs[i].x2, -1, xclamp);
+          dest_segs[i].y2 = CLAMP (dest_segs[i].y2, -1, yclamp);
+        }
+
+      /*  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 (! src_segs[i].open)
+        {
+          /*  If it is vertical  */
+          if (dest_segs[i].x1 == dest_segs[i].x2)
+            {
+              dest_segs[i].x1 -= 1;
+              dest_segs[i].x2 -= 1;
+            }
+          else
+            {
+              dest_segs[i].y1 -= 1;
+              dest_segs[i].y2 -= 1;
+            }
+        }
+    }
+}
+
+static void
+selection_generate_segs (Selection *selection)
+{
+  GimpImage          *image = gimp_display_get_image (selection->shell->display);
+  const GimpBoundSeg *segs_in;
+  const GimpBoundSeg *segs_out;
+
+  /*  Ask the image for the boundary of its selected region...
+   *  Then transform that information into a new buffer of GimpSegments
+   */
+  gimp_channel_boundary (gimp_image_get_mask (image),
+                         &segs_in, &segs_out,
+                         &selection->n_segs_in, &selection->n_segs_out,
+                         0, 0, 0, 0);
+
+  if (selection->n_segs_in)
+    {
+      selection->segs_in = g_new (GimpSegment, selection->n_segs_in);
+      selection_zoom_segs (selection, segs_in,
+                           selection->segs_in, selection->n_segs_in);
+
+      selection_render_mask (selection);
+    }
+  else
+    {
+      selection->segs_in = NULL;
+    }
+
+  /*  Possible secondary boundary representation  */
+  if (selection->n_segs_out)
+    {
+      selection->segs_out = g_new (GimpSegment, selection->n_segs_out);
+      selection_zoom_segs (selection, segs_out,
+                           selection->segs_out, selection->n_segs_out);
+    }
+  else
+    {
+      selection->segs_out = NULL;
+    }
+}
+
+static void
+selection_free_segs (Selection *selection)
+{
+  g_clear_pointer (&selection->segs_in, g_free);
+  selection->n_segs_in = 0;
+
+  g_clear_pointer (&selection->segs_out, g_free);
+  selection->segs_out = NULL;
+
+  g_clear_pointer (&selection->segs_in_mask, cairo_pattern_destroy);
+}
+
+static gboolean
+selection_start_timeout (Selection *selection)
+{
+  selection_free_segs (selection);
+  selection->timeout = 0;
+
+  if (! gimp_display_get_image (selection->shell->display))
+    return FALSE;
+
+  selection_generate_segs (selection);
+
+  selection->index = 0;
+
+  /*  Draw the ants  */
+  if (selection->show_selection)
+    {
+      GimpDisplayConfig *config = selection->shell->display->config;
+      cairo_t           *cr;
+
+      cr = gdk_cairo_create (gtk_widget_get_window (selection->shell->canvas));
+
+      selection_draw (selection, cr);
+
+      if (selection->segs_out)
+        {
+          if (selection->shell->rotate_transform)
+            cairo_transform (cr, selection->shell->rotate_transform);
+
+          gimp_display_shell_draw_selection_out (selection->shell, cr,
+                                                 selection->segs_out,
+                                                 selection->n_segs_out);
+        }
+
+      cairo_destroy (cr);
+
+      if (selection->segs_in && selection->shell_visible)
+        selection->timeout = g_timeout_add_full (G_PRIORITY_DEFAULT_IDLE,
+                                                 config->marching_ants_speed,
+                                                 (GSourceFunc) selection_timeout,
+                                                 selection, NULL);
+    }
+
+  return FALSE;
+}
+
+static gboolean
+selection_timeout (Selection *selection)
+{
+  cairo_t *cr;
+
+  cr = gdk_cairo_create (gtk_widget_get_window (selection->shell->canvas));
+
+  selection->index++;
+  selection_draw (selection, cr);
+
+  cairo_destroy (cr);
+
+  return TRUE;
+}
+
+static void
+selection_set_shell_visible (Selection *selection,
+                             gboolean   shell_visible)
+{
+  if (selection->shell_visible != shell_visible)
+    {
+      selection->shell_visible = shell_visible;
+
+      if (shell_visible)
+        selection_start (selection);
+      else
+        selection_stop (selection);
+    }
+}
+
+static gboolean
+selection_window_state_event (GtkWidget           *shell,
+                              GdkEventWindowState *event,
+                              Selection           *selection)
+{
+  selection_set_shell_visible (selection,
+                               (event->new_window_state & (GDK_WINDOW_STATE_WITHDRAWN |
+                                                           GDK_WINDOW_STATE_ICONIFIED)) == 0);
+
+  return FALSE;
+}
+
+static gboolean
+selection_visibility_notify_event (GtkWidget          *shell,
+                                   GdkEventVisibility *event,
+                                   Selection          *selection)
+{
+  selection_set_shell_visible (selection,
+                               event->state != GDK_VISIBILITY_FULLY_OBSCURED);
+
+  return FALSE;
+}