If we cannot access htbackdrops.com (still no API key), then make some simple backdrops

2013-06-04 18:28:40 +00:00
parent 7ed5f42056
commit 3be8c01d9a
7 changed files with 278 additions and 27 deletions
--- a/context/backdropcreator.cpp
+++ b/context/backdropcreator.cpp
@@ -0,0 +1,130 @@
+/*
+ * Cantata
+ *
+ * Copyright (c) 2011-2013 Craig Drummond <craig.p.drummond@gmail.com>
+ *
+ * ----
+ *
+ * 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; see the file COPYING.  If not, write to
+ * the Free Software Foundation, Inc., 51 Franklin Street, Fifth Floor,
+ * Boston, MA 02110-1301, USA.
+ */
+
+#include "backdropcreator.h"
+#include "covers.h"
+#include "thread.h"
+#include <QApplication>
+#include <QPainter>
+#include <stdlib.h>
+
+BackdropCreator::BackdropCreator()
+    : QObject(0)
+{
+    connect(Covers::self(), SIGNAL(cover(const Song &, const QImage &, const QString &)), SLOT(coverRetrieved(const Song &, const QImage &, const QString &)));
+    imageSize=QApplication::fontMetrics().height()*12;
+    thread=new Thread(metaObject()->className());
+    moveToThread(thread);
+    thread->start();
+}
+
+BackdropCreator::~BackdropCreator()
+{
+    thread->stop();
+}
+
+void BackdropCreator::create(const QString &artist, const QList<Song> &songs)
+{
+    requestedArtist=artist;
+    images.clear();
+    requested.clear();
+    foreach (const Song &s, songs) {
+        Covers::Image img=Covers::self()->requestImage(s);
+        if (!img.img.isNull()) {
+            images.append(img.img.scaled(imageSize, imageSize, Qt::IgnoreAspectRatio, Qt::SmoothTransformation));
+        } else {
+            requested.insert(s.album);
+        }
+    }
+
+    if (requested.isEmpty()) {
+        createImage();
+    }
+}
+
+void BackdropCreator::coverRetrieved(const Song &s, const QImage &img, const QString &file)
+{
+    Q_UNUSED(file)
+    if (requested.isEmpty() || s.albumArtist()!=requestedArtist) {
+        return;
+    }
+    if (requested.contains(s.album)) {
+        requested.remove(s.album);
+        if (!img.isNull()) {
+            images.append(img.scaled(imageSize, imageSize, Qt::IgnoreAspectRatio, Qt::SmoothTransformation));
+        }
+        if (requested.isEmpty()) {
+            createImage();
+        }
+    }
+}
+
+void BackdropCreator::createImage()
+{
+    QImage backdrop;
+
+    switch (images.count()) {
+    case 0:
+        break;
+    case 1:
+        backdrop=images.at(0);
+        break;
+    case 2: {
+        backdrop=QImage(2*imageSize, 2*imageSize, QImage::Format_RGB32);
+        QPainter p(&backdrop);
+        p.drawImage(0, 0, images.at(0));
+        p.drawImage(0, imageSize, images.at(1));
+        p.drawImage(imageSize, imageSize, images.at(0));
+        p.drawImage(imageSize, 0, images.at(1));
+        break;
+    }
+    default: {
+        static const int constHCount=10;
+        static const int constVCount=5;
+        backdrop=QImage(constHCount*imageSize, constVCount*imageSize, QImage::Format_RGB32);
+        QPainter p(&backdrop);
+        QList<QImage> toUse=images;
+        QList<int> currentLine;
+        QList<int> lastLine;
+
+        for (int y=0; y<constVCount; ++y) {
+            for (int x=0; x<constHCount; ++x) {
+                int index=-1;
+                do {
+                    index=random()%toUse.count();
+                } while (!lastLine.isEmpty() && lastLine.at(x)==index);
+                p.drawImage(x*imageSize, y*imageSize, toUse.takeAt(index));
+                if (toUse.isEmpty()) {
+                    toUse=images;
+                }
+                currentLine.append(index);
+            }
+            lastLine=currentLine;
+            currentLine.clear();
+        }
+        break;
+    }
+    }
+
+    emit created(requestedArtist, backdrop);
+}