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Havoc Pennington
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src/tools/metacity-mag.c
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283
src/tools/metacity-mag.c
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/* Hack for use instead of xmag */
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/*
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* Copyright (C) 2002 Red Hat Inc.
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*
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* This program is free software; you can redistribute it and/or
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* modify it under the terms of the GNU General Public License as
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* published by the Free Software Foundation; either version 2 of the
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* License, or (at your option) any later version.
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*
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* This program is distributed in the hope that it will be useful, but
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* WITHOUT ANY WARRANTY; without even the implied warranty of
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* MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the GNU
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* General Public License for more details.
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*
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* You should have received a copy of the GNU General Public License
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* along with this program; if not, write to the Free Software
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* Foundation, Inc., 59 Temple Place - Suite 330, Boston, MA
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* 02111-1307, USA.
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*/
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#include <gtk/gtk.h>
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#include <gdk/gdkx.h>
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#include <gdk/gdkkeysyms.h>
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#include <unistd.h>
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#include <stdlib.h>
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#include <math.h>
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static GtkWidget *grab_widget = NULL;
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static GtkWidget *display_window = NULL;
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static int last_grab_x = 0;
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static int last_grab_y = 0;
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static int last_grab_width = 150;
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static int last_grab_height = 150;
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static GtkAllocation last_grab_allocation;
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static double width_factor = 4.0;
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static double height_factor = 4.0;
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static GdkInterpType interp_mode = GDK_INTERP_NEAREST;
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static guint regrab_idle_id = 0;
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static GdkPixbuf*
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get_pixbuf (void)
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{
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GdkPixbuf *screenshot;
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GdkPixbuf *magnified;
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#if 0
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g_print ("Size %d x %d\n",
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last_grab_width, last_grab_height);
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#endif
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screenshot = gdk_pixbuf_get_from_drawable (NULL, gdk_get_default_root_window (),
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NULL,
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last_grab_x, last_grab_y, 0, 0,
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last_grab_width, last_grab_height);
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if (screenshot == NULL)
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{
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g_printerr ("Screenshot failed\n");
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exit (1);
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}
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magnified = gdk_pixbuf_scale_simple (screenshot, last_grab_width * width_factor,
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last_grab_height * height_factor,
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interp_mode);
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g_object_unref (G_OBJECT (screenshot));
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return magnified;
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}
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static gboolean
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regrab_idle (GtkWidget *image)
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{
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GdkPixbuf *magnified;
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if (image->allocation.width != last_grab_allocation.width ||
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image->allocation.height != last_grab_allocation.height)
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{
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last_grab_width = rint (image->allocation.width / width_factor);
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last_grab_height = rint (image->allocation.height / height_factor);
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last_grab_allocation = image->allocation;
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magnified = get_pixbuf ();
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gtk_image_set_from_pixbuf (GTK_IMAGE (image), magnified);
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g_object_unref (G_OBJECT (magnified));
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}
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regrab_idle_id = 0;
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return FALSE;
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}
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static void
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image_resized (GtkWidget *image)
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{
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if (regrab_idle_id == 0)
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regrab_idle_id = g_idle_add_full (G_PRIORITY_LOW + 100, (GSourceFunc) regrab_idle,
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image, NULL);
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}
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static void
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grab_area_at_mouse (GtkWidget *invisible,
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int x_root,
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int y_root)
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{
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GdkPixbuf *magnified;
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int width, height;
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GtkWidget *widget;
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width = last_grab_width;
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height = last_grab_height;
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last_grab_x = x_root;
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last_grab_y = y_root;
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last_grab_width = width;
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last_grab_height = height;
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magnified = get_pixbuf ();
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display_window = gtk_window_new (GTK_WINDOW_TOPLEVEL);
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gtk_window_set_default_size (GTK_WINDOW (display_window),
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last_grab_width, last_grab_height);
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widget = gtk_image_new_from_pixbuf (magnified);
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gtk_widget_set_size_request (widget, 40, 40);
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gtk_container_add (GTK_CONTAINER (display_window), widget);
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g_object_unref (G_OBJECT (magnified));
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g_object_add_weak_pointer (G_OBJECT (display_window), (void**) &display_window);
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g_signal_connect (G_OBJECT (display_window), "destroy",
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G_CALLBACK (gtk_main_quit), NULL);
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g_signal_connect_after (G_OBJECT (widget), "size_allocate", G_CALLBACK (image_resized), NULL);
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gtk_widget_show_all (display_window);
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}
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static void
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shutdown_grab (void)
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{
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gdk_keyboard_ungrab (gtk_get_current_event_time ());
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gdk_pointer_ungrab (gtk_get_current_event_time ());
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gtk_grab_remove (grab_widget);
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}
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static void
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mouse_motion (GtkWidget *invisible,
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GdkEventMotion *event,
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gpointer data)
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{
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}
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static gboolean
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mouse_release (GtkWidget *invisible,
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GdkEventButton *event,
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gpointer data)
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{
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if (event->button != 1)
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return FALSE;
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grab_area_at_mouse (invisible, event->x_root, event->y_root);
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shutdown_grab ();
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gtk_signal_disconnect_by_func (GTK_OBJECT (invisible),
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GTK_SIGNAL_FUNC (mouse_motion), NULL);
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gtk_signal_disconnect_by_func (GTK_OBJECT (invisible),
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GTK_SIGNAL_FUNC (mouse_release), NULL);
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return TRUE;
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}
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/* Helper Functions */
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static gboolean mouse_press (GtkWidget *invisible,
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GdkEventButton *event,
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gpointer data);
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static gboolean
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key_press (GtkWidget *invisible,
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GdkEventKey *event,
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gpointer data)
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{
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if (event->keyval == GDK_Escape)
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{
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shutdown_grab ();
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gtk_signal_disconnect_by_func (GTK_OBJECT (invisible),
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GTK_SIGNAL_FUNC (mouse_press),
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NULL);
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gtk_signal_disconnect_by_func (GTK_OBJECT (invisible),
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GTK_SIGNAL_FUNC (key_press),
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NULL);
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return TRUE;
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}
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return FALSE;
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}
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static gboolean
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mouse_press (GtkWidget *invisible,
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GdkEventButton *event,
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gpointer data)
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{
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if (event->type == GDK_BUTTON_PRESS &&
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event->button == 1)
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{
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gtk_signal_connect (GTK_OBJECT (invisible), "motion_notify_event",
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GTK_SIGNAL_FUNC (mouse_motion),
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NULL);
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gtk_signal_connect (GTK_OBJECT (invisible), "button_release_event",
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GTK_SIGNAL_FUNC (mouse_release),
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NULL);
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gtk_signal_disconnect_by_func (GTK_OBJECT (invisible),
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GTK_SIGNAL_FUNC (mouse_press),
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NULL);
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gtk_signal_disconnect_by_func (GTK_OBJECT (invisible),
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GTK_SIGNAL_FUNC (key_press),
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NULL);
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return TRUE;
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}
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return FALSE;
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}
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static void
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begin_area_grab (void)
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{
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if (grab_widget == NULL)
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{
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grab_widget = gtk_invisible_new ();
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gtk_widget_add_events (grab_widget,
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GDK_BUTTON_RELEASE_MASK | GDK_BUTTON_PRESS_MASK | GDK_POINTER_MOTION_MASK);
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gtk_widget_show (grab_widget);
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}
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if (gdk_keyboard_grab (grab_widget->window,
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FALSE,
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gtk_get_current_event_time ()) != GDK_GRAB_SUCCESS)
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{
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g_warning ("Failed to grab keyboard to do eyedropper");
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return;
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}
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if (gdk_pointer_grab (grab_widget->window,
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FALSE,
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GDK_BUTTON_RELEASE_MASK | GDK_BUTTON_PRESS_MASK | GDK_POINTER_MOTION_MASK,
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NULL,
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NULL,
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gtk_get_current_event_time ()) != GDK_GRAB_SUCCESS)
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{
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gdk_keyboard_ungrab (GDK_CURRENT_TIME);
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g_warning ("Failed to grab pointer to do eyedropper");
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return;
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}
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gtk_grab_add (grab_widget);
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gtk_signal_connect (GTK_OBJECT (grab_widget), "button_press_event",
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GTK_SIGNAL_FUNC (mouse_press), NULL);
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gtk_signal_connect (GTK_OBJECT (grab_widget), "key_press_event",
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GTK_SIGNAL_FUNC (key_press), NULL);
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}
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int
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main (int argc, char **argv)
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{
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gtk_init (&argc, &argv);
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begin_area_grab ();
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gtk_main ();
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return 0;
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}
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