use thumbnails for now...

imageformats/sai.cpp

@@ -2,6 +2,10 @@
 
 #include "sai.hpp"
 
+#include <QFile>
+#include <QDebug>
+#include <QImage>
+
 SAIHandler::SAIHandler()
 {
 
@@ -18,10 +22,33 @@ bool SAIHandler::canRead() const
 
 bool SAIHandler::read(QImage *image)
 {
-    Q_UNUSED(image)
+    QFile * file = qobject_cast<QFile*>(device());
+    if (!file) {
         return false;
     }
 
+    sai::Document saiDoc(file->fileName().toUtf8().data());
+    if (!saiDoc.IsOpen()) {
+        qDebug() << "isOpen false";
+        return false;
+    }
+
+    std::uint32_t width, height;
+    std::unique_ptr<std::uint8_t[]> PixelData;
+    std::tie(PixelData, width, height) = saiDoc.GetThumbnail();
+//    std::uint32_t aw, ah;
+//    std::tie(aw, ah) = saiDoc.GetCanvasSize();
+//    qDebug() << width << height << aw << ah;
+    if( PixelData == nullptr || !width || !height ) {
+        return false;
+    }
+
+    const unsigned char * bytes = PixelData.get();
+    QImage img(bytes, static_cast<int>(width), static_cast<int>(height), QImage::Format_RGB32);
+    *image = img;
+    return true;
+}
+
 bool SAIHandler::write(const QImage &image)
 {
     Q_UNUSED(image)