Qball's Weblog
MultiMonitor Background settings.
I got sick and tired of no program being able to set desktop background on multimonitor setups.
It either stretch it over the 2 desktops, or whatever, because most tools like xsetbg and feh assume it one screen.
This tools sets one image scaled to the size of each monitor. Clipping the image (monitor is then centered on the image) is optional.
It will never try to scale up the image.
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/* multidesktopbackground.vala * * Copyright (C) 2011 Qball Cow <qball @gmpclient.org> * * 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 <http: //www.gnu.org/licenses/>. * * Author: * Qball Cow </qball><qball @gmpclient.org> */ using Gtk; /** * Set the actual background on the X server */ static void set_background(Gdk.Window root_window, Gdk.Pixbuf background_pb) { Gdk.Pixmap pixmap; Gdk.Bitmap bitmap; // Grab server, without this, it won't work. Gdk.x11_grab_server(); // Set background pixmap. Gdk.pixbuf_render_pixmap_and_mask(background_pb,out pixmap, out bitmap, ); root_window.set_back_pixmap(pixmap, false); // Otherwise the background will only update after being exposed. /// @todo can I trigger an expose event on GdkWindow? root_window.draw_pixbuf(null, background_pb, ,,,, background_pb.get_width(), background_pb.get_height(), Gdk.RgbDither.NONE, ,); // Release Gdk.x11_ungrab_server(); } /** * Option parser */ string clipping = null; const GLib.OptionEntry[] entries = { {"clipping", 'c', , GLib.OptionArg.STRING, ref clipping, "Enable clipping", null}, {null} }; /** * Main program */ static int main (string[] argv) { bool clip = false; /** * Parse command line list */ GLib.OptionContext og = new GLib.OptionContext("Evo"); og.add_main_entries(entries,null); try{ og.parse(ref argv); }catch (Error e) { GLib.error("Failed to parse command line options: %s\n", e.message); } /** * Parse clipping */ if(clipping != null) { if(clipping.down() == "true") { clip = true; } } /** * Get filename */ if(argv.length != 2) { GLib.error("Failed parsing commandlines"); } string file = argv[1]; // Initialize GTK. Gtk.init(ref argv); // Get display Gdk.Display display = Gdk.Display.get_default(); // Get number of screens. int num_screens = display.get_n_screens(); // Walk the screens. for(int screen = ; screen < num_screens ; screen++) { Gdk.Screen gscreen = display.get_screen(screen); Gdk.Window root_window = gscreen.get_root_window(); int rw_width = gscreen.get_width(); int rw_height = gscreen.get_height(); // Create background pixmap. var background_pb = new Gdk.Pixbuf(Gdk.Colorspace.RGB,false,8, rw_width, rw_height); // Iterate over all the monitors and draw the image there. // Get number of monitors. int num_monitors = gscreen.get_n_monitors(); for(int monitor = ; monitor < num_monitors; monitor++) { Gdk.Rectangle rectangle; // get monitor size gscreen.get_monitor_geometry(monitor, out rectangle); // Gdk.Pixbuf loading and drawing inside. try { Gdk.Pixbuf? pb = new Gdk.Pixbuf.from_file(file); // Get size int pb_width = pb.get_width(); int pb_height = pb.get_height(); // Scaling double x_scale = pb_width/(double)rectangle.width; double y_scale = pb_height/(double)rectangle.height; if(x_scale >= 1 && y_scale >= 1 && clip) { if(x_scale > y_scale) { int new_width = (int)(pb_width/y_scale); int new_height = (int)(pb_height/y_scale); pb = pb.scale_simple(new_width, new_height, Gdk.InterpType.HYPER); int x_offset = (new_width - rectangle.width)/2; int y_offset = (new_height- rectangle.height)/2; pb.copy_area( x_offset,y_offset, new_width-x_offset*2,new_height-y_offset*2, background_pb, rectangle.x, rectangle.y ); } else { int new_width = (int)(pb_width/x_scale); int new_height = (int)(pb_height/x_scale); pb = pb.scale_simple(new_width, new_height, Gdk.InterpType.HYPER); int x_offset = (new_width - rectangle.width)/2; int y_offset = (new_height- rectangle.height)/2; pb.copy_area( x_offset,y_offset, new_width-x_offset*2,new_height-y_offset*2, background_pb, rectangle.x,rectangle.y ); } } else if(x_scale > y_scale) { int new_width = (int)(pb_width/x_scale); int new_height = (int)(pb_height/x_scale); pb = pb.scale_simple(new_width, new_height, Gdk.InterpType.HYPER); pb.copy_area(,, new_width, new_height, background_pb, rectangle.x + (rectangle.width-new_width)/2, rectangle.y + (rectangle.height-new_height)/2 ); } else { int new_width = (int)(pb_width/y_scale); int new_height = (int)(pb_height/y_scale); pb = pb.scale_simple(new_width, new_height, Gdk.InterpType.HYPER); pb.copy_area(,, new_width, new_height, background_pb, rectangle.x + (rectangle.width-new_width)/2, rectangle.y + (rectangle.height-new_height)/2 ); } } catch (Error e) { GLib.error("Failed loading pixbuf: %s\n", e.message); } } set_background(root_window, background_pb); } return 1; } </qball> |
compile with:
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valac --pkg=gtk+-2.0 MultiDesktopBackground.vala --pkg=gdk-x11-2.0 --pkg=x11 |
edit: updated it a bit and put in git: here.