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-rw-r--r--app/display/gimpdisplayshell-selection.c504
1 files changed, 504 insertions, 0 deletions
diff --git a/app/display/gimpdisplayshell-selection.c b/app/display/gimpdisplayshell-selection.c
new file mode 100644
index 0000000..3cfacd3
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+++ b/app/display/gimpdisplayshell-selection.c
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+/* 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_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,
+ gint canvas_offset_x,
+ gint canvas_offset_y);
+static void selection_generate_segs (Selection *selection);
+static void selection_free_segs (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;
+ shell->selection_update = g_get_monotonic_time ();
+
+ 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 &&
+ gimp_display_get_image (selection->shell->display) &&
+ selection->show_selection)
+ {
+ /* Draw the ants once */
+ selection_timeout (selection);
+
+ if (selection->segs_in && selection->shell_visible)
+ {
+ GimpDisplayConfig *config = selection->shell->display->config;
+
+ selection->timeout = g_timeout_add_full (G_PRIORITY_DEFAULT_IDLE,
+ config->marching_ants_speed,
+ (GSourceFunc) selection_timeout,
+ selection, NULL);
+ }
+ }
+}
+
+static void
+selection_stop (Selection *selection)
+{
+ if (selection->timeout)
+ {
+ g_source_remove (selection->timeout);
+ selection->timeout = 0;
+ }
+}
+
+void
+gimp_display_shell_selection_draw (GimpDisplayShell *shell,
+ cairo_t *cr)
+{
+ if (gimp_display_get_image (shell->display) &&
+ shell->selection && shell->selection->show_selection)
+ {
+ GimpDisplayConfig *config = shell->display->config;
+ gint64 time = g_get_monotonic_time ();
+
+ if ((time - shell->selection_update) / 1000 > config->marching_ants_speed &&
+ shell->selection->paused == 0)
+ {
+ shell->selection_update = time;
+ shell->selection->index++;
+ }
+
+ selection_generate_segs (shell->selection);
+
+ if (shell->selection->segs_in)
+ {
+ gimp_display_shell_draw_selection_in (shell->selection->shell, cr,
+ shell->selection->segs_in_mask,
+ shell->selection->index % 8);
+ }
+
+ if (shell->selection->segs_out)
+ {
+ if (shell->selection->shell->rotate_transform)
+ cairo_transform (cr, shell->selection->shell->rotate_transform);
+
+ gimp_display_shell_draw_selection_out (shell->selection->shell, cr,
+ shell->selection->segs_out,
+ shell->selection->n_segs_out);
+ }
+ }
+}
+
+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 (GTK_WIDGET (selection->shell));
+ 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,
+ gint canvas_offset_x,
+ gint canvas_offset_y)
+{
+ 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) + canvas_offset_x;
+ dest_segs[i].y1 = CLAMP (dest_segs[i].y1, -1, yclamp) + canvas_offset_y;
+
+ dest_segs[i].x2 = CLAMP (dest_segs[i].x2, -1, xclamp) + canvas_offset_x;
+ dest_segs[i].y2 = CLAMP (dest_segs[i].y2, -1, yclamp) + canvas_offset_y;
+ }
+
+ /* 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;
+ gint canvas_offset_x = 0;
+ gint canvas_offset_y = 0;
+
+ selection_free_segs (selection);
+
+ /* 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,
+ canvas_offset_x, canvas_offset_y);
+
+ selection_render_mask (selection);
+ }
+
+ /* 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,
+ canvas_offset_x, canvas_offset_y);
+ }
+}
+
+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->n_segs_out = 0;
+
+ g_clear_pointer (&selection->segs_in_mask, cairo_pattern_destroy);
+}
+
+static gboolean
+selection_timeout (Selection *selection)
+{
+ GimpDisplayConfig *config = selection->shell->display->config;
+ gint64 time = g_get_monotonic_time ();
+
+ if ((time - selection->shell->selection_update) / 1000 > config->marching_ants_speed)
+ {
+ GdkWindow *window;
+
+ window = gtk_widget_get_window (GTK_WIDGET (selection->shell));
+
+ gtk_widget_queue_draw_area (GTK_WIDGET (selection->shell),
+ 0, 0,
+ gdk_window_get_width (window),
+ gdk_window_get_height (window));
+ }
+
+ return G_SOURCE_CONTINUE;
+}
+
+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;
+}
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