inicial

1 files changed, 389 insertions, 0 deletions

diff --git a/shell/ev-utils.c b/shell/ev-utils.c
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--- /dev/null
+++ b/shell/ev-utils.c
@@ -0,0 +1,389 @@
+/* -*- Mode: C; tab-width: 8; indent-tabs-mode: t; c-basic-offset: 8; c-indent-level: 8 -*- */
+/*
+ *  Copyright (C) 2004 Anders Carlsson <[email protected]>
+ *
+ *  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 2, 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, write to the Free Software
+ *  Foundation, Inc., 51 Franklin Street, Fifth Floor, Boston, MA 02110-1301, USA.
+ *
+ */
+
+#include <config.h>
+
+#include "ev-utils.h"
+#include "ev-file-helpers.h"
+
+#include <string.h>
+#include <math.h>
+#include <glib/gi18n.h>
+
+typedef struct
+{
+  int size;
+  double *data;
+} ConvFilter;
+
+static double
+gaussian (double x, double y, double r)
+{
+    return ((1 / (2 * M_PI * r)) *
+	    exp ((- (x * x + y * y)) / (2 * r * r)));
+}
+
+static ConvFilter *
+create_blur_filter (int radius)
+{
+  ConvFilter *filter;
+  int x, y;
+  double sum;
+  
+  filter = g_new0 (ConvFilter, 1);
+  filter->size = radius * 2 + 1;
+  filter->data = g_new (double, filter->size * filter->size);
+
+  sum = 0.0;
+  
+  for (y = 0 ; y < filter->size; y++)
+    {
+      for (x = 0 ; x < filter->size; x++)
+	{
+	  sum += filter->data[y * filter->size + x] = gaussian (x - (filter->size >> 1),
+								y - (filter->size >> 1),
+								radius);
+	}
+    }
+
+  for (y = 0; y < filter->size; y++)
+    {
+      for (x = 0; x < filter->size; x++)
+	{
+	  filter->data[y * filter->size + x] /= sum;
+	}
+    }
+
+  return filter;
+  
+}
+
+static GdkPixbuf *
+create_shadow (GdkPixbuf *src, int blur_radius,
+	       int x_offset, int y_offset, double opacity)
+{
+  int x, y, i, j;
+  int width, height;
+  GdkPixbuf *dest;
+  static ConvFilter *filter = NULL;
+  int src_rowstride, dest_rowstride;
+  int src_bpp, dest_bpp;
+  
+  guchar *src_pixels, *dest_pixels;
+
+  if (!filter)
+    filter = create_blur_filter (blur_radius);
+
+  if (x_offset < 0)
+	  x_offset = (blur_radius * 4) / 5;
+  
+  if (y_offset < 0)
+	  y_offset = (blur_radius * 4) / 5;
+
+  
+  width = gdk_pixbuf_get_width (src) + blur_radius * 2 + x_offset;
+  height = gdk_pixbuf_get_height (src) + blur_radius * 2 + y_offset;
+
+  dest = gdk_pixbuf_new (gdk_pixbuf_get_colorspace (src), TRUE,
+			 gdk_pixbuf_get_bits_per_sample (src),
+			 width, height);
+  gdk_pixbuf_fill (dest, 0);  
+  src_pixels = gdk_pixbuf_get_pixels (src);
+  src_rowstride = gdk_pixbuf_get_rowstride (src);
+  src_bpp = gdk_pixbuf_get_has_alpha (src) ? 4 : 3;
+  
+  dest_pixels = gdk_pixbuf_get_pixels (dest);
+  dest_rowstride = gdk_pixbuf_get_rowstride (dest);
+  dest_bpp = gdk_pixbuf_get_has_alpha (dest) ? 4 : 3;
+  
+  for (y = 0; y < height; y++)
+    {
+      for (x = 0; x < width; x++)
+	{
+	  int sumr = 0, sumg = 0, sumb = 0, suma = 0;
+
+	  for (i = 0; i < filter->size; i++)
+	    {
+	      for (j = 0; j < filter->size; j++)
+		{
+		  int src_x, src_y;
+
+		  src_y = -(blur_radius + x_offset) + y - (filter->size >> 1) + i;
+		  src_x = -(blur_radius + y_offset) + x - (filter->size >> 1) + j;
+
+		  if (src_y < 0 || src_y > gdk_pixbuf_get_height (src) ||
+		      src_x < 0 || src_x > gdk_pixbuf_get_width (src))
+		    continue;
+
+		  sumr += src_pixels [src_y * src_rowstride +
+				      src_x * src_bpp + 0] *
+		    filter->data [i * filter->size + j];
+		  sumg += src_pixels [src_y * src_rowstride +
+				      src_x * src_bpp + 1] * 
+		    filter->data [i * filter->size + j];
+
+		  sumb += src_pixels [src_y * src_rowstride +
+				      src_x * src_bpp + 2] * 
+		    filter->data [i * filter->size + j];
+		  
+		  if (src_bpp == 4)
+		    suma += src_pixels [src_y * src_rowstride +
+					src_x * src_bpp + 3] *
+		    filter->data [i * filter->size + j];
+		  else
+			  suma += 0xff;
+		    
+		}
+	    }
+
+	  if (dest_bpp == 4)
+	    dest_pixels [y * dest_rowstride +
+			 x * dest_bpp + 3] = (suma * opacity) / (filter->size * filter->size);
+
+	}
+    }
+  
+  return dest;
+}
+
+GdkPixbuf *
+ev_pixbuf_add_shadow (GdkPixbuf *src, int size,
+		      int x_offset, int y_offset, double opacity)
+{
+  GdkPixbuf *dest;
+  
+  dest = create_shadow (src, size, x_offset, y_offset, opacity);
+
+  gdk_pixbuf_composite (src, dest,
+			size, size,
+			gdk_pixbuf_get_width (src),
+			gdk_pixbuf_get_height (src),
+ 			size, size,
+			1.0, 1.0,
+			GDK_INTERP_NEAREST, 255);
+
+  return dest;
+}
+
+
+/* Simple function to output the contents of a region.  Used solely for testing
+ * the region code.
+ */
+void
+ev_print_region_contents (cairo_region_t *region)
+{
+	gint n_rectangles, i;
+
+	if (region == NULL) {
+		g_print ("<empty region>\n");
+		return;
+	}
+
+	g_print ("<region %p>\n", region);
+	n_rectangles = cairo_region_num_rectangles (region);
+	for (i = 0; i < n_rectangles; i++) {
+		GdkRectangle rect;
+
+		cairo_region_get_rectangle (region, i, &rect);
+		g_print ("\t(%d %d, %d %d) [%dx%d]\n",
+			 rect.x,
+			 rect.y,
+			 rect.x + rect.width,
+			 rect.y + rect.height,
+			 rect.width,
+			 rect.height);
+	}
+}
+
+static void
+ev_gui_sanitise_popup_position (GtkMenu *menu,
+				GtkWidget *widget,
+				gint *x,
+				gint *y)
+{
+	GdkScreen *screen = gtk_widget_get_screen (widget);
+	gint monitor_num;
+	GdkRectangle monitor;
+	GtkRequisition req;
+
+	g_return_if_fail (widget != NULL);
+
+	gtk_widget_size_request (GTK_WIDGET (menu), &req);
+
+	monitor_num = gdk_screen_get_monitor_at_point (screen, *x, *y);
+	gtk_menu_set_monitor (menu, monitor_num);
+	gdk_screen_get_monitor_geometry (screen, monitor_num, &monitor);
+
+	*x = CLAMP (*x, monitor.x, monitor.x + MAX (0, monitor.width - req.width));
+	*y = CLAMP (*y, monitor.y, monitor.y + MAX (0, monitor.height - req.height));
+}
+
+void
+ev_gui_menu_position_tree_selection (GtkMenu   *menu,
+				     gint      *x,
+				     gint      *y,
+				     gboolean  *push_in,
+				     gpointer  user_data)
+{
+	GtkTreeSelection *selection;
+	GList *selected_rows;
+	GtkTreeModel *model;
+	GtkTreeView *tree_view = GTK_TREE_VIEW (user_data);
+	GtkWidget *widget = GTK_WIDGET (user_data);
+	GtkRequisition req;
+	GtkAllocation allocation;
+	GdkRectangle visible;
+
+	gtk_widget_size_request (GTK_WIDGET (menu), &req);
+	gdk_window_get_origin (gtk_widget_get_window (widget), x, y);
+	gtk_widget_get_allocation (widget, &allocation);
+
+	*x += (allocation.width - req.width) / 2;
+
+	/* Add on height for the treeview title */
+	gtk_tree_view_get_visible_rect (tree_view, &visible);
+	*y += allocation.height - visible.height;
+
+	selection = gtk_tree_view_get_selection (tree_view);
+	selected_rows = gtk_tree_selection_get_selected_rows (selection, &model);
+	if (selected_rows)
+	{
+		GdkRectangle cell_rect;
+
+		gtk_tree_view_get_cell_area (tree_view, selected_rows->data,
+					     NULL, &cell_rect);
+
+		*y += CLAMP (cell_rect.y + cell_rect.height, 0, visible.height);
+
+		g_list_foreach (selected_rows, (GFunc)gtk_tree_path_free, NULL);
+		g_list_free (selected_rows);
+	}
+
+	ev_gui_sanitise_popup_position (menu, widget, x, y);
+}
+
+/**
+ * get_num_monitors: Get the number of user monitors.
+ * @window: optional GtkWindow to look at.
+ *
+ * Returns: Number of monitors, -1 if uncertain situation (like multiple screens)
+ */
+gint 
+get_num_monitors (GtkWindow *window)
+{
+	GdkDisplay *display; 
+	GdkScreen *screen;
+	gint num_screen;
+	
+	display = gdk_display_get_default ();
+	num_screen = gdk_display_get_n_screens (display);
+	
+	if (num_screen != 1)
+		return -1;
+	
+	if (window)
+		screen = gtk_window_get_screen (window);
+	else
+		screen = gdk_display_get_screen (display, 0);
+
+	return gdk_screen_get_n_monitors (screen);
+}
+
+void           
+file_chooser_dialog_add_writable_pixbuf_formats (GtkFileChooser *chooser)
+{
+	GSList *pixbuf_formats = NULL;
+	GSList *iter;
+	GtkFileFilter *filter;
+	int i;
+  
+	filter = gtk_file_filter_new();
+	gtk_file_filter_set_name (filter, _("By extension"));
+	g_object_set_data (G_OBJECT(filter), "pixbuf-format", NULL);
+	gtk_file_chooser_add_filter (chooser, filter);
+
+	pixbuf_formats = gdk_pixbuf_get_formats ();
+
+	for (iter = pixbuf_formats; iter; iter = iter->next) {
+		GdkPixbufFormat *format = iter->data;
+
+	        gchar *description, *name, *extensions;
+		gchar **extension_list, **mime_types;
+
+		if (gdk_pixbuf_format_is_disabled (format) ||
+	    	    !gdk_pixbuf_format_is_writable (format))
+		            continue;
+
+	        name = gdk_pixbuf_format_get_description (format);
+	        extension_list = gdk_pixbuf_format_get_extensions (format);
+	        extensions = g_strjoinv (", ", extension_list);
+		g_strfreev (extension_list);
+		description = g_strdup_printf ("%s (%s)", name, extensions);
+
+		filter = gtk_file_filter_new ();
+		gtk_file_filter_set_name (filter, description);
+		g_object_set_data (G_OBJECT (filter), "pixbuf-format", format);
+		gtk_file_chooser_add_filter (chooser, filter);
+
+		g_free (description);
+		g_free (extensions);
+		g_free (name);
+
+		mime_types = gdk_pixbuf_format_get_mime_types (format);
+		for (i = 0; mime_types[i] != 0; i++)
+			gtk_file_filter_add_mime_type (filter, mime_types[i]);
+		g_strfreev (mime_types);
+	}
+
+	g_slist_free (pixbuf_formats);
+}
+
+GdkPixbufFormat*
+get_gdk_pixbuf_format_by_extension (gchar *uri)
+{
+	GSList *pixbuf_formats = NULL;
+	GSList *iter;
+	int i;
+
+	pixbuf_formats = gdk_pixbuf_get_formats ();
+
+	for (iter = pixbuf_formats; iter; iter = iter->next) {
+		gchar **extension_list;
+		GdkPixbufFormat *format = iter->data;
+		
+		if (gdk_pixbuf_format_is_disabled (format) ||
+	    	    !gdk_pixbuf_format_is_writable (format))
+		            continue;
+
+	        extension_list = gdk_pixbuf_format_get_extensions (format);
+
+		for (i = 0; extension_list[i] != 0; i++) {
+			if (g_str_has_suffix (uri, extension_list[i])) {
+			    	g_slist_free (pixbuf_formats);
+				g_strfreev (extension_list);
+				return format;
+			}
+		}
+		g_strfreev (extension_list);
+	}
+
+	g_slist_free (pixbuf_formats);
+	return NULL;
+}