diff -r 11202097584f -r 745c73e0e644 qmlfrontend/previewimageprovider.cpp
--- /dev/null	Thu Jan 01 00:00:00 1970 +0000
+++ b/qmlfrontend/previewimageprovider.cpp	Tue Nov 06 17:00:35 2018 +0100
@@ -0,0 +1,31 @@
+#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);
+}