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-rw-r--r--shell/ev-utils.c389
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+/* -*- 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;
+}
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