diff -r e33bcb9d5e9c -r 488782d9aba9 qmlfrontend/previewimageprovider.cpp
--- /dev/null	Thu Jan 01 00:00:00 1970 +0000
+++ b/qmlfrontend/previewimageprovider.cpp	Tue Dec 26 01:36:58 2017 +0100
@@ -0,0 +1,36 @@
+#include "previewimageprovider.h"
+
+PreviewImageProvider::PreviewImageProvider()
+        : QQuickImageProvider(QQuickImageProvider::Pixmap)
+{
+}
+
+QPixmap PreviewImageProvider::requestPixmap(const QString &id, QSize *size, const QSize &requestedSize)
+{
+    Q_UNUSED(id);
+    Q_UNUSED(requestedSize);
+
+    if (size)
+        *size = m_px.size();
+
+    return m_px;
+}
+
+void PreviewImageProvider::setPixmap(const QByteArray &px)
+{
+    QVector<QRgb> colorTable;
+    colorTable.resize(256);
+    for(int i = 0; i < 256; ++i)
+        colorTable[i] = qRgba(255, 255, 0, i);
+
+    const quint8 *buf = (const quint8*) px.constData();
+    QImage im(buf, 256, 128, QImage::Format_Indexed8);
+    im.setColorTable(colorTable);
+
+    m_px = QPixmap::fromImage(im, Qt::ColorOnly);
+    //QPixmap pxres(px.size());
+    //QPainter p(&pxres);
+
+    //p.fillRect(pxres.rect(), linearGrad);
+    //p.drawPixmap(0, 0, px);
+}