Move SLA import to libslic3r with png reading using libpng

Also fix flipped object issue

9 files changed, 358 insertions, 374 deletions

diff --git a/src/libslic3r/Format/SL1.cpp b/src/libslic3r/Format/SL1.cpp
index 5c402ef5b..3d672eccb 100644
--- a/src/libslic3r/Format/SL1.cpp
+++ b/src/libslic3r/Format/SL1.cpp
@@ -8,8 +8,314 @@
 #include "libslic3r/Zipper.hpp"
 #include "libslic3r/SLAPrint.hpp"
 
+#include <sstream>
+
+#include "libslic3r/SlicesToTriangleMesh.hpp"
+#include "libslic3r/MarchingSquares.hpp"
+#include "libslic3r/ClipperUtils.hpp"
+#include "libslic3r/MTUtils.hpp"
+#include "libslic3r/PrintConfig.hpp"
+#include "libslic3r/SLA/RasterBase.hpp"
+#include "libslic3r/miniz_extension.hpp"
+#include "libslic3r/PNGRead.hpp"
+
+#include <boost/property_tree/ini_parser.hpp>
+#include <boost/filesystem/path.hpp>
+#include <boost/algorithm/string.hpp>
+
+namespace marchsq {
+
+template<> struct _RasterTraits<Slic3r::png::ImageGreyscale> {
+    using Rst = Slic3r::png::ImageGreyscale;
+
+    // The type of pixel cell in the raster
+    using ValueType = uint8_t;
+
+    // Value at a given position
+    static uint8_t get(const Rst &rst, size_t row, size_t col)
+    {
+        return rst.get(row, col);
+    }
+
+    // Number of rows and cols of the raster
+    static size_t rows(const Rst &rst) { return rst.rows; }
+    static size_t cols(const Rst &rst) { return rst.cols; }
+};
+
+} // namespace marchsq
+
 namespace Slic3r {
 
+namespace {
+
+struct PNGBuffer { std::vector<uint8_t> buf; std::string fname; };
+struct ArchiveData {
+    boost::property_tree::ptree profile, config;
+    std::vector<PNGBuffer> images;
+};
+
+static const constexpr char *CONFIG_FNAME  = "config.ini";
+static const constexpr char *PROFILE_FNAME = "prusaslicer.ini";
+
+boost::property_tree::ptree read_ini(const mz_zip_archive_file_stat &entry,
+                                     MZ_Archive &                    zip)
+{
+    std::string buf(size_t(entry.m_uncomp_size), '\0');
+
+    if (!mz_zip_reader_extract_file_to_mem(&zip.arch, entry.m_filename,
+                                           buf.data(), buf.size(), 0))
+        throw std::runtime_error(zip.get_errorstr());
+
+    boost::property_tree::ptree tree;
+    std::stringstream ss(buf);
+    boost::property_tree::read_ini(ss, tree);
+    return tree;
+}
+
+PNGBuffer read_png(const mz_zip_archive_file_stat &entry,
+                   MZ_Archive &                    zip,
+                   const std::string &             name)
+{
+    std::vector<uint8_t> buf(entry.m_uncomp_size);
+
+    if (!mz_zip_reader_extract_file_to_mem(&zip.arch, entry.m_filename,
+                                           buf.data(), buf.size(), 0))
+        throw std::runtime_error(zip.get_errorstr());
+
+    return {std::move(buf), (name.empty() ? entry.m_filename : name)};
+}
+
+ArchiveData extract_sla_archive(const std::string &zipfname,
+                                 const std::string &exclude)
+{
+    ArchiveData arch;
+
+    // Little RAII
+    struct Arch: public MZ_Archive {
+        Arch(const std::string &fname) {
+            if (!open_zip_reader(&arch, fname))
+                throw std::runtime_error(get_errorstr());
+        }
+
+        ~Arch() { close_zip_reader(&arch); }
+    } zip (zipfname);
+
+    mz_uint num_entries = mz_zip_reader_get_num_files(&zip.arch);
+
+    for (mz_uint i = 0; i < num_entries; ++i)
+    {
+        mz_zip_archive_file_stat entry;
+
+        if (mz_zip_reader_file_stat(&zip.arch, i, &entry))
+        {
+            std::string name = entry.m_filename;
+            boost::algorithm::to_lower(name);
+
+            if (boost::algorithm::contains(name, exclude)) continue;
+
+            if (name == CONFIG_FNAME) arch.config = read_ini(entry, zip);
+            if (name == PROFILE_FNAME) arch.profile = read_ini(entry, zip);
+
+            if (boost::filesystem::path(name).extension().string() == ".png") {
+                auto it = std::lower_bound(
+                    arch.images.begin(), arch.images.end(), PNGBuffer{{}, name},
+                    [](const PNGBuffer &r1, const PNGBuffer &r2) {
+                        return std::less<std::string>()(r1.fname, r2.fname);
+                    });
+
+                arch.images.insert(it, read_png(entry, zip, name));
+            }
+        }
+    }
+
+    return arch;
+}
+
+ExPolygons rings_to_expolygons(const std::vector<marchsq::Ring> &rings,
+                               double px_w, double px_h)
+{
+    ExPolygons polys; polys.reserve(rings.size());
+
+    for (const marchsq::Ring &ring : rings) {
+        Polygon poly; Points &pts = poly.points;
+        pts.reserve(ring.size());
+
+        for (const marchsq::Coord &crd : ring)
+            pts.emplace_back(scaled(crd.c * px_w), scaled(crd.r * px_h));
+
+        polys.emplace_back(poly);
+    }
+
+    // reverse the raster transformations
+    return union_ex(polys);
+}
+
+template<class Fn> void foreach_vertex(ExPolygon &poly, Fn &&fn)
+{
+    for (auto &p : poly.contour.points) fn(p);
+    for (auto &h : poly.holes)
+        for (auto &p : h.points) fn(p);
+}
+
+void invert_raster_trafo(ExPolygons &                  expolys,
+                         const sla::RasterBase::Trafo &trafo,
+                         coord_t                       width,
+                         coord_t                       height)
+{
+    for (auto &expoly : expolys) {
+        if (trafo.mirror_y)
+            foreach_vertex(expoly, [height](Point &p) {p.y() = height - p.y(); });
+
+        if (trafo.mirror_x)
+            foreach_vertex(expoly, [width](Point &p) {p.x() = width - p.x(); });
+
+        expoly.translate(-trafo.center_x, -trafo.center_y);
+
+        if (trafo.flipXY)
+            foreach_vertex(expoly, [](Point &p) { std::swap(p.x(), p.y()); });
+
+        if ((trafo.mirror_x + trafo.mirror_y + trafo.flipXY) % 2) {
+            expoly.contour.reverse();
+            for (auto &h : expoly.holes) h.reverse();
+        }
+    }
+}
+
+struct RasterParams {
+    sla::RasterBase::Trafo trafo; // Raster transformations
+    coord_t        width, height; // scaled raster dimensions (not resolution)
+    double         px_h, px_w;    // pixel dimesions
+    marchsq::Coord win;           // marching squares window size
+};
+
+RasterParams get_raster_params(const DynamicPrintConfig &cfg)
+{
+    auto *opt_disp_cols = cfg.option<ConfigOptionInt>("display_pixels_x");
+    auto *opt_disp_rows = cfg.option<ConfigOptionInt>("display_pixels_y");
+    auto *opt_disp_w    = cfg.option<ConfigOptionFloat>("display_width");
+    auto *opt_disp_h    = cfg.option<ConfigOptionFloat>("display_height");
+    auto *opt_mirror_x  = cfg.option<ConfigOptionBool>("display_mirror_x");
+    auto *opt_mirror_y  = cfg.option<ConfigOptionBool>("display_mirror_y");
+    auto *opt_orient    = cfg.option<ConfigOptionEnum<SLADisplayOrientation>>("display_orientation");
+
+    if (!opt_disp_cols || !opt_disp_rows || !opt_disp_w || !opt_disp_h ||
+        !opt_mirror_x || !opt_mirror_y || !opt_orient)
+        throw std::runtime_error("Invalid SL1 file");
+
+    RasterParams rstp;
+
+    rstp.px_w = opt_disp_w->value / (opt_disp_cols->value - 1);
+    rstp.px_h = opt_disp_h->value / (opt_disp_rows->value - 1);
+
+    rstp.trafo = sla::RasterBase::Trafo{opt_orient->value == sladoLandscape ?
+                                     sla::RasterBase::roLandscape :
+                                     sla::RasterBase::roPortrait,
+                                 {opt_mirror_x->value, opt_mirror_y->value}};
+
+    rstp.height = scaled(opt_disp_h->value);
+    rstp.width  = scaled(opt_disp_w->value);
+
+    return rstp;
+}
+
+struct SliceParams { double layerh = 0., initial_layerh = 0.; };
+
+SliceParams get_slice_params(const DynamicPrintConfig &cfg)
+{
+    auto *opt_layerh = cfg.option<ConfigOptionFloat>("layer_height");
+    auto *opt_init_layerh = cfg.option<ConfigOptionFloat>("initial_layer_height");
+
+    if (!opt_layerh || !opt_init_layerh)
+        throw std::runtime_error("Invalid SL1 file");
+
+    return SliceParams{opt_layerh->getFloat(), opt_init_layerh->getFloat()};
+}
+
+std::vector<ExPolygons> extract_slices_from_sla_archive(
+    ArchiveData &            arch,
+    const RasterParams &     rstp,
+    std::function<bool(int)> progr)
+{
+    auto jobdir = arch.config.get<std::string>("jobDir");
+    for (auto &c : jobdir) c = std::tolower(c);
+
+    std::vector<ExPolygons> slices(arch.images.size());
+
+    struct Status
+    {
+        double          incr, val, prev;
+        bool            stop = false;
+        tbb::spin_mutex mutex;
+    } st {100. / slices.size(), 0., 0.};
+
+    tbb::parallel_for(size_t(0), arch.images.size(),
+                     [&arch, &slices, &st, &rstp, progr](size_t i) {
+        // Status indication guarded with the spinlock
+        {
+            std::lock_guard<tbb::spin_mutex> lck(st.mutex);
+            if (st.stop) return;
+
+            st.val += st.incr;
+            double curr = std::round(st.val);
+            if (curr > st.prev) {
+                st.prev = curr;
+                st.stop = !progr(int(curr));
+            }
+        }
+
+        png::ImageGreyscale img;
+        png::ReadBuf rb{arch.images[i].buf.data(), arch.images[i].buf.size()};
+        if (!png::decode_png(rb, img)) return;
+
+        auto rings = marchsq::execute(img, 128, rstp.win);
+        ExPolygons expolys = rings_to_expolygons(rings, rstp.px_w, rstp.px_h);
+
+        // Invert the raster transformations indicated in
+        // the profile metadata
+        invert_raster_trafo(expolys, rstp.trafo, rstp.width, rstp.height);
+
+        slices[i] = std::move(expolys);
+    });
+
+    if (st.stop) slices = {};
+
+    return slices;
+}
+
+} // namespace
+
+void import_sla_archive(const std::string &zipfname, DynamicPrintConfig &out)
+{
+    ArchiveData arch = extract_sla_archive(zipfname, "png");
+    out.load(arch.profile);
+}
+
+void import_sla_archive(
+    const std::string &      zipfname,
+    Vec2i                    windowsize,
+    TriangleMesh &           out,
+    DynamicPrintConfig &     profile,
+    std::function<bool(int)> progr)
+{
+    // Ensure minimum window size for marching squares
+    windowsize.x() = std::max(2, windowsize.x());
+    windowsize.y() = std::max(2, windowsize.y());
+
+    ArchiveData arch = extract_sla_archive(zipfname, "thumbnail");
+    profile.load(arch.profile);
+
+    RasterParams rstp = get_raster_params(profile);
+    rstp.win          = {windowsize.y(), windowsize.x()};
+
+    SliceParams slicp = get_slice_params(profile);
+
+    std::vector<ExPolygons> slices =
+        extract_slices_from_sla_archive(arch, rstp, progr);
+
+    if (!slices.empty())
+        out = slices_to_triangle_mesh(slices, 0, slicp.layerh, slicp.initial_layerh);
+}
+
 using ConfMap = std::map<std::string, std::string>;
 
 namespace {
diff --git a/src/libslic3r/Format/SL1.hpp b/src/libslic3r/Format/SL1.hpp
index fbb6d6160..ab731ff84 100644
--- a/src/libslic3r/Format/SL1.hpp
+++ b/src/libslic3r/Format/SL1.hpp
@@ -38,6 +38,24 @@ public:
     }
 };
     
+void import_sla_archive(const std::string &zipfname, DynamicPrintConfig &out);
+
+void import_sla_archive(
+    const std::string &      zipfname,
+    Vec2i                    windowsize,
+    TriangleMesh &           out,
+    DynamicPrintConfig &     profile,
+    std::function<bool(int)> progr = [](int) { return true; });
+
+inline void import_sla_archive(
+    const std::string &      zipfname,
+    Vec2i                    windowsize,
+    TriangleMesh &           out,
+    std::function<bool(int)> progr = [](int) { return true; })
+{
+    DynamicPrintConfig profile;
+    import_sla_archive(zipfname, windowsize, out, profile, progr);
+}
 
 } // namespace Slic3r::sla
 
diff --git a/src/libslic3r/PNGRead.cpp b/src/libslic3r/PNGRead.cpp
index 8bfa3cb95..6eb7d593c 100644
--- a/src/libslic3r/PNGRead.cpp
+++ b/src/libslic3r/PNGRead.cpp
@@ -7,12 +7,22 @@
 
 namespace Slic3r { namespace png {
 
-struct png_deleter { void operator()(png_struct *p) {
-    png_destroy_read_struct( &p, nullptr, nullptr); }
+struct PNGDescr {
+    png_struct *png = nullptr; png_info *info = nullptr;
+
+    PNGDescr() = default;
+    PNGDescr(const PNGDescr&) = delete;
+    PNGDescr(PNGDescr&&) = delete;
+    PNGDescr& operator=(const PNGDescr&) = delete;
+    PNGDescr& operator=(PNGDescr&&) = delete;
+
+    ~PNGDescr()
+    {
+        if (png && info) png_destroy_info_struct(png, &info);
+        if (png) png_destroy_read_struct( &png, nullptr, nullptr);
+    }
 };
 
-using png_ptr_t = std::unique_ptr<png_struct_def, png_deleter>;
-
 bool is_png(const ReadBuf &rb)
 {
     static const constexpr int PNG_SIG_BYTES = 8;
@@ -25,22 +35,23 @@ bool decode_png(const ReadBuf &rb, ImageGreyscale &img)
 {
     if (!is_png(rb)) return false;
 
-    png_ptr_t png{png_create_read_struct(PNG_LIBPNG_VER_STRING, nullptr, nullptr, nullptr)};
+    PNGDescr dsc;
+    dsc.png = png_create_read_struct(PNG_LIBPNG_VER_STRING, nullptr, nullptr, nullptr);
 
-    if(!png) return false;
+    if(!dsc.png) return false;
 
-    png_infop info = png_create_info_struct(png.get());
-    if(!info) return {};
+    dsc.info = png_create_info_struct(dsc.png);
+    if(!dsc.info) return {};
 
     FILE *io = ::fmemopen(const_cast<void *>(rb.buf), rb.sz, "rb");
-    png_init_io(png.get(), io);
+    png_init_io(dsc.png, io);
 
-    png_read_info(png.get(), info);
+    png_read_info(dsc.png, dsc.info);
 
-    img.cols = png_get_image_width(png.get(), info);
-    img.rows = png_get_image_height(png.get(), info);
-    size_t color_type = png_get_color_type(png.get(), info);
-    size_t bit_depth  = png_get_bit_depth(png.get(), info);
+    img.cols = png_get_image_width(dsc.png, dsc.info);
+    img.rows = png_get_image_height(dsc.png, dsc.info);
+    size_t color_type = png_get_color_type(dsc.png, dsc.info);
+    size_t bit_depth  = png_get_bit_depth(dsc.png, dsc.info);
 
     if (color_type != PNG_COLOR_TYPE_GRAY || bit_depth != 8)
         return false;
@@ -49,7 +60,7 @@ bool decode_png(const ReadBuf &rb, ImageGreyscale &img)
 
     auto readbuf = static_cast<png_bytep>(img.buf.data());
     for (size_t r = 0; r < img.rows; ++r)
-        png_read_row(png.get(), readbuf + r * img.cols, nullptr);
+        png_read_row(dsc.png, readbuf + r * img.cols, nullptr);
 
     fclose(io);
 
diff --git a/src/libslic3r/PNGRead.hpp b/src/libslic3r/PNGRead.hpp
index 88a948395..0e7311f2e 100644
--- a/src/libslic3r/PNGRead.hpp
+++ b/src/libslic3r/PNGRead.hpp
@@ -19,12 +19,14 @@ struct RGB { uint8_t r, g, b; };
 using ImageRGB = Image<RGB>;
 using ImageGreyscale = Image<uint8_t>;
 
-// TODO
-// bool decode_png(Buffer &&pngbuf, ImageRGB &img);
-
 bool is_png(const ReadBuf &pngbuf);
 
+// Only decodes true 8 bit grayscale png images. Returns false for other formats
+// TODO: implement transformation of rgb images into grayscale...
 bool decode_png(const ReadBuf &pngbuf, ImageGreyscale &img);
 
+// TODO
+// bool decode_png(Buffer &&pngbuf, ImageRGB &img);
+
 }}
 #endif // PNGREAD_HPP
diff --git a/src/slic3r/CMakeLists.txt b/src/slic3r/CMakeLists.txt
index 8a2672c77..b64cfdf4f 100644
--- a/src/slic3r/CMakeLists.txt
+++ b/src/slic3r/CMakeLists.txt
@@ -187,8 +187,6 @@ set(SLIC3R_GUI_SOURCES
     Utils/HexFile.cpp
     Utils/HexFile.hpp
     Utils/Thread.hpp
-    Utils/SLAImport.hpp
-    Utils/SLAImport.cpp
 )
 
 if (APPLE)
diff --git a/src/slic3r/GUI/GUI_ObjectList.hpp b/src/slic3r/GUI/GUI_ObjectList.hpp
index aa5264b07..b59631d67 100644
--- a/src/slic3r/GUI/GUI_ObjectList.hpp
+++ b/src/slic3r/GUI/GUI_ObjectList.hpp
@@ -294,7 +294,7 @@ public:
     void                load_part(ModelObject* model_object, std::vector<std::pair<wxString, bool>> &volumes_info, ModelVolumeType type);
 	void                load_generic_subobject(const std::string& type_name, const ModelVolumeType type);
     void                load_shape_object(const std::string &type_name);
-    void                load_mesh_object(const TriangleMesh &mesh, const wxString &name);  
+    void                load_mesh_object(const TriangleMesh &mesh, const wxString &name);
     void                del_object(const int obj_idx);
     void                del_subobject_item(wxDataViewItem& item);
     void                del_settings_from_config(const wxDataViewItem& parent_item);
diff --git a/src/slic3r/GUI/Jobs/SLAImportJob.cpp b/src/slic3r/GUI/Jobs/SLAImportJob.cpp
index 2d5d5b072..ae92bd698 100644
--- a/src/slic3r/GUI/Jobs/SLAImportJob.cpp
+++ b/src/slic3r/GUI/Jobs/SLAImportJob.cpp
@@ -1,10 +1,11 @@
 #include "SLAImportJob.hpp"
 
+#include "libslic3r/Format/SL1.hpp"
+
 #include "slic3r/GUI/GUI.hpp"
 #include "slic3r/GUI/GUI_App.hpp"
 #include "slic3r/GUI/Plater.hpp"
 #include "slic3r/GUI/GUI_ObjectList.hpp"
-#include "slic3r/Utils/SLAImport.hpp"
 
 #include "libslic3r/Model.hpp"
 #include "libslic3r/PresetBundle.hpp"
diff --git a/src/slic3r/Utils/SLAImport.cpp b/src/slic3r/Utils/SLAImport.cpp
deleted file mode 100644
index 13ea60339..000000000
--- a/src/slic3r/Utils/SLAImport.cpp
+++ /dev/null
@@ -1,317 +0,0 @@
-#include "SLAImport.hpp"
-
-#include <sstream>
-
-#include "libslic3r/SlicesToTriangleMesh.hpp"
-#include "libslic3r/MarchingSquares.hpp"
-#include "libslic3r/ClipperUtils.hpp"
-#include "libslic3r/MTUtils.hpp"
-#include "libslic3r/PrintConfig.hpp"
-#include "libslic3r/SLA/RasterBase.hpp"
-#include "libslic3r/miniz_extension.hpp"
-#include "libslic3r/PNGRead.hpp"
-
-#include <boost/property_tree/ini_parser.hpp>
-#include <boost/filesystem/path.hpp>
-#include <boost/algorithm/string.hpp>
-
-#include <wx/mstream.h>
-
-namespace marchsq {
-
-template<> struct _RasterTraits<Slic3r::png::ImageGreyscale> {
-    using Rst = Slic3r::png::ImageGreyscale;
-
-    // The type of pixel cell in the raster
-    using ValueType = uint8_t;
-
-    // Value at a given position
-    static uint8_t get(const Rst &rst, size_t row, size_t col)
-    {
-        return rst.get(row, col);
-    }
-
-    // Number of rows and cols of the raster
-    static size_t rows(const Rst &rst) { return rst.rows; }
-    static size_t cols(const Rst &rst) { return rst.cols; }
-};
-
-} // namespace marchsq
-
-namespace Slic3r {
-
-namespace {
-
-struct PNGBuffer { std::vector<uint8_t> buf; std::string fname; };
-struct ArchiveData {
-    boost::property_tree::ptree profile, config;
-    std::vector<PNGBuffer> images;
-};
-
-static const constexpr char *CONFIG_FNAME  = "config.ini";
-static const constexpr char *PROFILE_FNAME = "prusaslicer.ini";
-
-boost::property_tree::ptree read_ini(const mz_zip_archive_file_stat &entry,
-                                     MZ_Archive &                    zip)
-{
-    std::string buf(size_t(entry.m_uncomp_size), '\0');
-    
-    if (!mz_zip_reader_extract_file_to_mem(&zip.arch, entry.m_filename,
-                                           buf.data(), buf.size(), 0))
-        throw std::runtime_error(zip.get_errorstr());
-    
-    boost::property_tree::ptree tree;
-    std::stringstream ss(buf);
-    boost::property_tree::read_ini(ss, tree);
-    return tree;
-}
-
-PNGBuffer read_png(const mz_zip_archive_file_stat &entry,
-                   MZ_Archive &                    zip,
-                   const std::string &             name)
-{
-    std::vector<uint8_t> buf(entry.m_uncomp_size);
-
-    if (!mz_zip_reader_extract_file_to_mem(&zip.arch, entry.m_filename,
-                                           buf.data(), buf.size(), 0))
-        throw std::runtime_error(zip.get_errorstr());
-    
-    return {std::move(buf), (name.empty() ? entry.m_filename : name)};
-}
-
-ArchiveData extract_sla_archive(const std::string &zipfname,
-                                 const std::string &exclude)
-{
-    ArchiveData arch;
-    
-    // Little RAII
-    struct Arch: public MZ_Archive {
-        Arch(const std::string &fname) {
-            if (!open_zip_reader(&arch, fname))
-                throw std::runtime_error(get_errorstr());
-        }
-        
-        ~Arch() { close_zip_reader(&arch); }
-    } zip (zipfname);
-
-    mz_uint num_entries = mz_zip_reader_get_num_files(&zip.arch);
-    
-    for (mz_uint i = 0; i < num_entries; ++i)
-    {
-        mz_zip_archive_file_stat entry;
-        
-        if (mz_zip_reader_file_stat(&zip.arch, i, &entry))
-        {
-            std::string name = entry.m_filename;
-            boost::algorithm::to_lower(name);
-            
-            if (boost::algorithm::contains(name, exclude)) continue;
-            
-            if (name == CONFIG_FNAME) arch.config = read_ini(entry, zip);
-            if (name == PROFILE_FNAME) arch.profile = read_ini(entry, zip);
-            
-            if (boost::filesystem::path(name).extension().string() == ".png") {
-                auto it = std::lower_bound(
-                    arch.images.begin(), arch.images.end(), PNGBuffer{{}, name},
-                    [](const PNGBuffer &r1, const PNGBuffer &r2) {
-                        return std::less<std::string>()(r1.fname, r2.fname);
-                    });
-                
-                arch.images.insert(it, read_png(entry, zip, name));
-            }
-        }
-    }
-    
-    return arch;
-}
-
-ExPolygons rings_to_expolygons(const std::vector<marchsq::Ring> &rings,
-                               double px_w, double px_h)
-{
-    ExPolygons polys; polys.reserve(rings.size());
-    
-    for (const marchsq::Ring &ring : rings) {
-        Polygon poly; Points &pts = poly.points;
-        pts.reserve(ring.size());
-        
-        for (const marchsq::Coord &crd : ring)
-            pts.emplace_back(scaled(crd.c * px_w), scaled(crd.r * px_h));
-        
-        polys.emplace_back(poly);
-    }
-    
-    // reverse the raster transformations
-    return union_ex(polys);
-}
-
-template<class Fn> void foreach_vertex(ExPolygon &poly, Fn &&fn)
-{
-    for (auto &p : poly.contour.points) fn(p);
-    for (auto &h : poly.holes)
-        for (auto &p : h.points) fn(p);
-}
-
-void invert_raster_trafo(ExPolygons &                  expolys,
-                         const sla::RasterBase::Trafo &trafo,
-                         coord_t                       width,
-                         coord_t                       height)
-{
-    for (auto &expoly : expolys) {
-        if (trafo.mirror_y)
-            foreach_vertex(expoly, [height](Point &p) {p.y() = height - p.y(); });
-        
-        if (trafo.mirror_x)
-            foreach_vertex(expoly, [width](Point &p) {p.x() = width - p.x(); });
-        
-        expoly.translate(-trafo.center_x, -trafo.center_y);
-        
-        if (trafo.flipXY)
-            foreach_vertex(expoly, [](Point &p) { std::swap(p.x(), p.y()); });
-        
-        if ((trafo.mirror_x + trafo.mirror_y + trafo.flipXY) % 2) {
-            expoly.contour.reverse();
-            for (auto &h : expoly.holes) h.reverse();
-        }
-    }
-}
-
-struct RasterParams {
-    sla::RasterBase::Trafo trafo; // Raster transformations
-    coord_t        width, height; // scaled raster dimensions (not resolution)
-    double         px_h, px_w;    // pixel dimesions
-    marchsq::Coord win;           // marching squares window size
-};
-
-RasterParams get_raster_params(const DynamicPrintConfig &cfg)
-{
-    auto *opt_disp_cols = cfg.option<ConfigOptionInt>("display_pixels_x");
-    auto *opt_disp_rows = cfg.option<ConfigOptionInt>("display_pixels_y");
-    auto *opt_disp_w    = cfg.option<ConfigOptionFloat>("display_width");
-    auto *opt_disp_h    = cfg.option<ConfigOptionFloat>("display_height");
-    auto *opt_mirror_x  = cfg.option<ConfigOptionBool>("display_mirror_x");
-    auto *opt_mirror_y  = cfg.option<ConfigOptionBool>("display_mirror_y");
-    auto *opt_orient    = cfg.option<ConfigOptionEnum<SLADisplayOrientation>>("display_orientation");
-    
-    if (!opt_disp_cols || !opt_disp_rows || !opt_disp_w || !opt_disp_h ||
-        !opt_mirror_x || !opt_mirror_y || !opt_orient)
-        throw std::runtime_error("Invalid SL1 file");
-    
-    RasterParams rstp;
-    
-    rstp.px_w = opt_disp_w->value / (opt_disp_cols->value - 1);
-    rstp.px_h = opt_disp_h->value / (opt_disp_rows->value - 1);
-    
-    sla::RasterBase::Trafo trafo{opt_orient->value == sladoLandscape ?
-                                     sla::RasterBase::roLandscape :
-                                     sla::RasterBase::roPortrait,
-                                 {opt_mirror_x->value, opt_mirror_y->value}};
-    
-    rstp.height = scaled(opt_disp_h->value);
-    rstp.width  = scaled(opt_disp_w->value);
-    
-    return rstp;
-}
-
-struct SliceParams { double layerh = 0., initial_layerh = 0.; };
-
-SliceParams get_slice_params(const DynamicPrintConfig &cfg)
-{
-    auto *opt_layerh = cfg.option<ConfigOptionFloat>("layer_height");
-    auto *opt_init_layerh = cfg.option<ConfigOptionFloat>("initial_layer_height");
-    
-    if (!opt_layerh || !opt_init_layerh)
-        throw std::runtime_error("Invalid SL1 file");
-    
-    return SliceParams{opt_layerh->getFloat(), opt_init_layerh->getFloat()};
-}
-
-std::vector<ExPolygons> extract_slices_from_sla_archive(
-    ArchiveData &            arch,
-    const RasterParams &     rstp,
-    std::function<bool(int)> progr)
-{
-    auto jobdir = arch.config.get<std::string>("jobDir");
-    for (auto &c : jobdir) c = std::tolower(c);
-    
-    std::vector<ExPolygons> slices(arch.images.size());
-
-    struct Status
-    {
-        double          incr, val, prev;
-        bool            stop = false;
-        tbb::spin_mutex mutex;
-    } st {100. / slices.size(), 0., 0.};
-    
-    tbb::parallel_for(size_t(0), arch.images.size(),
-                     [&arch, &slices, &st, &rstp, progr](size_t i) {
-        // Status indication guarded with the spinlock
-        {
-            std::lock_guard<tbb::spin_mutex> lck(st.mutex);
-            if (st.stop) return;
-    
-            st.val += st.incr;
-            double curr = std::round(st.val);
-            if (curr > st.prev) {
-                st.prev = curr;
-                st.stop = !progr(int(curr));
-            }
-        }
-        
-//        PNGBuffer &png = arch.images[i];
-//        wxMemoryInputStream   stream{png.buf.data(), png.buf.size()};
-//        wxImage               img{stream};
-
-        png::ImageGreyscale img;
-        png::ReadBuf rb{arch.images[i].buf.data(), arch.images[i].buf.size()};
-        png::decode_png(rb, img);
-    
-        auto rings = marchsq::execute(img, 128, rstp.win);
-        ExPolygons expolys = rings_to_expolygons(rings, rstp.px_w, rstp.px_h);
-
-        // Invert the raster transformations indicated in
-        // the profile metadata
-        invert_raster_trafo(expolys, rstp.trafo, rstp.width, rstp.height);
-    
-        slices[i] = std::move(expolys);
-    });
-    
-    if (st.stop) slices = {};
-
-    return slices;
-}
-
-} // namespace
-
-void import_sla_archive(const std::string &zipfname, DynamicPrintConfig &out)
-{
-    ArchiveData arch = extract_sla_archive(zipfname, "png");
-    out.load(arch.profile);
-}
-
-void import_sla_archive(
-    const std::string &      zipfname,
-    Vec2i                    windowsize,
-    TriangleMesh &           out,
-    DynamicPrintConfig &     profile,
-    std::function<bool(int)> progr)
-{
-    // Ensure minimum window size for marching squares
-    windowsize.x() = std::max(2, windowsize.x());
-    windowsize.y() = std::max(2, windowsize.y());
-
-    ArchiveData arch = extract_sla_archive(zipfname, "thumbnail");
-    profile.load(arch.profile);
-
-    RasterParams rstp = get_raster_params(profile);
-    rstp.win          = {windowsize.y(), windowsize.x()};
-    
-    SliceParams slicp = get_slice_params(profile);
-    
-    std::vector<ExPolygons> slices =
-        extract_slices_from_sla_archive(arch, rstp, progr);
-   
-    if (!slices.empty())
-        out = slices_to_triangle_mesh(slices, 0, slicp.layerh, slicp.initial_layerh);
-}
-
-} // namespace Slic3r
diff --git a/src/slic3r/Utils/SLAImport.hpp b/src/slic3r/Utils/SLAImport.hpp
deleted file mode 100644
index 73995014f..000000000
--- a/src/slic3r/Utils/SLAImport.hpp
+++ /dev/null
@@ -1,35 +0,0 @@
-#ifndef SLAIMPORT_HPP
-#define SLAIMPORT_HPP
-
-#include <functional>
-
-#include <libslic3r/Point.hpp>
-#include <libslic3r/PrintConfig.hpp>
-
-namespace Slic3r {
-
-class TriangleMesh;
-class DynamicPrintConfig;
-
-void import_sla_archive(const std::string &zipfname, DynamicPrintConfig &out);
-
-void import_sla_archive(
-    const std::string &      zipfname,
-    Vec2i                    windowsize,
-    TriangleMesh &           out,
-    DynamicPrintConfig &     profile,
-    std::function<bool(int)> progr = [](int) { return true; });
-
-inline void import_sla_archive(
-    const std::string &      zipfname,
-    Vec2i                    windowsize,
-    TriangleMesh &           out,
-    std::function<bool(int)> progr = [](int) { return true; })
-{
-    DynamicPrintConfig profile;
-    import_sla_archive(zipfname, windowsize, out, profile, progr);
-}
-
-}
-
-#endif // SLAIMPORT_HPP