Added tech ENABLE_THUMBNAIL_GENERATOR -> 1st installment of generation of thumbnail from plater (WIP)

src/libslic3r/GCode/ThumbnailData.cpp

@@ -0,0 +1,31 @@
+#include "libslic3r/libslic3r.h"
+#include "ThumbnailData.hpp"
+
+#if ENABLE_THUMBNAIL_GENERATOR
+
+namespace Slic3r {
+
+void ThumbnailData::set(unsigned int w, unsigned int h)
+{
+    if (!pixels.empty())
+        reset();
+
+    if ((w == 0) || (h == 0))
+        return;
+
+    width = w;
+    height = h;
+    // defaults to white texture
+    pixels = std::vector<unsigned char>(width * height * 4, 255);
+}
+
+void ThumbnailData::reset()
+{
+    width = 0;
+    height = 0;
+    pixels.clear();
+}
+
+} // namespace Slic3r
+
+#endif // ENABLE_THUMBNAIL_GENERATOR