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/*
* Copyright (C) 2018 Elias Entrup <elias-git@flump.de>
*
* 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 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/>.
*/
using Folks;
using GLib;
[GtkTemplate (ui = "/org/gnome/Contacts/ui/contacts-qr-code-dialog.ui")]
public class Contacts.QrCodeDialog : Gtk.Window {
[GtkChild]
private unowned Gtk.Picture qr_image;
[GtkChild]
private unowned Gtk.Label qr_subtitle;
public QrCodeDialog.for_contact (Individual individual, Gtk.Window? parent = null) {
Object (transient_for: parent);
var subtitle = GLib.Markup.printf_escaped (_("Scan the QR code to save the contact <b>%s</b>."),
individual.display_name);
this.qr_subtitle.set_markup (subtitle);
var individuals = new Gee.ArrayList<Individual> ();
individuals.add (individual);
var stringstream = new GLib.MemoryOutputStream.resizable ();
var op = new Io.VCardExportOperation (individuals, stringstream);
op.execute.begin ((obj, res) => {
try {
op.execute.end (res);
uint8[] chars = {0};
stringstream.write (chars);
stringstream.close ();
} catch (Error e) {
warning ("ERROR: %s", e.message);
}
var content = (string) stringstream.steal_data ();
int QR_IMAGE_SIZE = 300;
var scale = this.qr_image.get_scale_factor ();
create_qr_code (content, QR_IMAGE_SIZE * scale);
});
}
private void create_qr_code (string content, int size) {
if (content == "") {
warning ("Failed to create QR code: no content");
return;
}
var result = new QRencode.QRcode.encodeString (content,
0,
QRencode.EcLevel.M,
QRencode.Mode.B8,
1);
if (result == null) {
warning ("Failed to create QR code: libqrencode error");
return;
}
var qr_size = result.width;
var pixel_size = (int) double.max (1, size / qr_size);
var total_size = qr_size * pixel_size;
var BYTES_PER_R8G8B8 = 3;
var qr_matrix = new GLib.ByteArray.sized ((uint)(total_size * total_size * pixel_size * BYTES_PER_R8G8B8));
for (var column = 0; column < total_size; column++) {
for (var i = 0; i < pixel_size; i++) {
for (var row = 0; row < total_size / pixel_size; row++) {
if ((result.data[qr_size*row + column] & 0x01) > 0) {
fill_pixel (qr_matrix, 0x00, pixel_size);
} else {
fill_pixel (qr_matrix, 0xff, pixel_size);
}
}
}
}
var bytes = ByteArray.free_to_bytes (qr_matrix);
var paintable = new Gdk.MemoryTexture (total_size, total_size,
Gdk.MemoryFormat.R8G8B8,
bytes,
total_size * BYTES_PER_R8G8B8);
this.qr_image.set_paintable (paintable);
}
private void fill_pixel (GLib.ByteArray array, uint8 val, int pixel_size) {
for (uint i = 0; i < pixel_size; i++) {
array.append ({val}); // R
array.append ({val}); // G
array.append ({val}); // B
}
}
}
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