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

src/slic3r/GUI/ThumbnailGenerator.hpp

@@ -0,0 +1,37 @@
+#ifndef slic3r_GUI_ThumbnailGenerator_hpp_
+#define slic3r_GUI_ThumbnailGenerator_hpp_
+
+#if ENABLE_THUMBNAIL_GENERATOR
+
+#include "../libslic3r/GCode/ThumbnailData.hpp"
+
+#include <array>
+
+namespace Slic3r {
+    class GLVolume;
+namespace GUI {
+    class GLCanvas3D;
+
+    class ThumbnailGenerator
+    {
+        ThumbnailData m_data;
+
+    public:
+        ThumbnailGenerator() { reset(); }
+
+        void reset();
+
+        bool render_to_png_file(const GLCanvas3D& canvas, const std::string& filename, unsigned int w, unsigned int h, bool printable_only);
+
+    private:
+        void render(const GLCanvas3D& canvas, bool printable_only);
+        void render_objects(const std::vector<const GLVolume*>& volumes) const;
+    };
+
+} // namespace GUI
+} // namespace Slic3r
+
+#endif // ENABLE_THUMBNAIL_GENERATOR
+
+#endif // slic3r_GUI_ThumbnailGenerator_hpp_
+