1 files changed, 238 insertions, 0 deletions
diff --git a/src/trace/autotrace/inkscape-autotrace.cpp b/src/trace/autotrace/inkscape-autotrace.cpp
new file mode 100644
index 0000000..d147890
--- /dev/null
+++ b/src/trace/autotrace/inkscape-autotrace.cpp
@@ -0,0 +1,238 @@
+// SPDX-License-Identifier: GPL-2.0-or-later
+/** @file
+ * This is the C++ glue between Inkscape and Autotrace
+ *//*
+ *
+ * Authors:
+ *   Marc Jeanmougin
+ *
+ * Copyright (C) 2018 Authors
+ *
+ * Released under GNU GPL v2+, read the file 'COPYING' for more information.
+ *
+ */
+
+#include "inkscape-autotrace.h"
+
+extern "C" {
+#include "3rdparty/autotrace/autotrace.h"
+#include "3rdparty/autotrace/output.h"
+#include "3rdparty/autotrace/spline.h"
+}
+
+#include <glibmm/i18n.h>
+#include <gtkmm/main.h>
+#include <iomanip>
+
+#include "trace/filterset.h"
+#include "trace/imagemap-gdk.h"
+#include "trace/quantize.h"
+
+#include "desktop.h"
+#include "message-stack.h"
+#include <inkscape.h>
+
+#include "object/sp-path.h"
+
+#include <svg/path-string.h>
+
+using Glib::ustring;
+
+// static void updateGui()
+// {
+//     //## Allow the GUI to update
+//     Gtk::Main::iteration(false); // at least once, non-blocking
+//     while (Gtk::Main::events_pending())
+//         Gtk::Main::iteration();
+// }
+
+namespace Inkscape {
+
+namespace Trace {
+
+namespace Autotrace {
+
+static guchar* to_3channels(GdkPixbuf* input) {
+    if (!input) {
+        return nullptr;
+    }
+    int imgsize = gdk_pixbuf_get_height(input) * gdk_pixbuf_get_width(input);
+    guchar *out = (guchar*)malloc(3 * imgsize);
+    if (!out) {
+        g_warning("Autotrace::to_3channels: can not allocate memory for %d pixel image.", imgsize);
+        return nullptr;
+    }
+    int x=0;
+    guchar* pix = gdk_pixbuf_get_pixels (input);
+    int rs = gdk_pixbuf_get_rowstride (input);
+    for(int row=0;row<gdk_pixbuf_get_height(input);row++) {
+        for (int col=0;col<gdk_pixbuf_get_width(input);col++) {
+            guchar alpha = *(pix + row * rs + col * 4 + 3);
+            guchar white = 255 - alpha;
+            for(int chan=0;chan<3;chan++) {
+                // guchar *pnew = (pix + row * rs + col * 3 + chan);
+                guchar *pold = (pix + row * rs + col * 4 + chan);
+                out[x++] = (guchar)(((int)(*pold) * (int)alpha / 256) + white);
+            }
+        }
+    }
+    return out;
+}
+
+
+/**
+ *
+ */
+AutotraceTracingEngine::AutotraceTracingEngine()
+    : keepGoing(1)
+    , traceType(TRACE_OUTLINE)
+    , invert(false)
+{
+    /* get default parameters */
+    opts = at_fitting_opts_new();
+    opts->background_color = at_color_new(255,255,255);
+    autotrace_init();
+}
+
+AutotraceTracingEngine::~AutotraceTracingEngine() { at_fitting_opts_free(opts); }
+
+
+
+// TODO
+Glib::RefPtr<Gdk::Pixbuf> AutotraceTracingEngine::preview(Glib::RefPtr<Gdk::Pixbuf> thePixbuf) { 
+    //auto x = thePixbuf.copy();
+    guchar *pb = to_3channels(thePixbuf->gobj());
+    if (!pb) {
+        return Glib::RefPtr<Gdk::Pixbuf>();
+    }
+    return Gdk::Pixbuf::create_from_data(pb, thePixbuf->get_colorspace(), false, 8, thePixbuf->get_width(),
+                                         thePixbuf->get_height(), (thePixbuf->get_width() * 3),
+                                         [](const guint8 *pb) { free(const_cast<guint8 *>(pb)); });
+}
+
+int test_cancel (void* keepGoing){return !(* ((int*)keepGoing));}
+
+/**
+ *  This is the working method of this interface, and all
+ *  implementing classes.  Take a GdkPixbuf, trace it, and
+ *  return the path data that is compatible with the d="" attribute
+ *  of an SVG <path> element.
+ */
+std::vector<TracingEngineResult> AutotraceTracingEngine::trace(Glib::RefPtr<Gdk::Pixbuf> pixbuf)
+{
+    GdkPixbuf *pb1 = pixbuf->gobj();
+    guchar *pb = to_3channels(pb1);
+    if (!pb) {
+        return std::vector<TracingEngineResult>();
+    }
+    
+    at_bitmap *bitmap =
+//        at_bitmap_new(gdk_pixbuf_get_width(pb), gdk_pixbuf_get_height(pb), gdk_pixbuf_get_n_channels(pb));
+//    bitmap->bitmap = gdk_pixbuf_get_pixels(pb);
+    at_bitmap_new(gdk_pixbuf_get_width(pb1), gdk_pixbuf_get_height(pb1), 3);
+    free(bitmap->bitmap); // should create at_bitmap with bitmap->bitmap = pb
+    bitmap->bitmap = pb;
+    
+    at_splines_type *splines = at_splines_new_full(bitmap, opts, NULL, NULL, NULL, NULL, test_cancel, &keepGoing);
+    // at_output_write_func wfunc = at_output_get_handler_by_suffix("svg");
+    // at_spline_writer *wfunc = at_output_get_handler_by_suffix("svg");
+
+
+    int height = splines->height;
+    // const at_splines_type spline = *splines;
+    at_spline_list_array_type spline = *splines;
+
+    unsigned this_list;
+    at_spline_list_type list;
+    at_color last_color = { 0, 0, 0 };
+
+    std::stringstream theStyle;
+    std::stringstream thePath;
+    char color[10];
+    int nNodes = 0;
+
+    std::vector<TracingEngineResult> res;
+
+    // at_splines_write(wfunc, stdout, "", NULL, splines, NULL, NULL);
+
+    for (this_list = 0; this_list < SPLINE_LIST_ARRAY_LENGTH(spline); this_list++) {
+        unsigned this_spline;
+        at_spline_type first;
+
+        list = SPLINE_LIST_ARRAY_ELT(spline, this_list);
+        first = SPLINE_LIST_ELT(list, 0);
+
+        if (this_list == 0 || !at_color_equal(&list.color, &last_color)) {
+            if (this_list > 0) {
+                if (!(spline.centerline || list.open)) {
+                    thePath << "z";
+                    nNodes++;
+                }
+                TracingEngineResult ter(theStyle.str(), thePath.str(), nNodes);
+                res.push_back(ter);
+                theStyle.clear();
+                thePath.clear();
+                nNodes = 0;
+            }
+            sprintf(color, "#%02x%02x%02x;", list.color.r, list.color.g, list.color.b);
+
+            theStyle << ((spline.centerline || list.open) ? "stroke:" : "fill:") << color
+                     << ((spline.centerline || list.open) ? "fill:" : "stroke:") << "none";
+        }
+        thePath << "M" << START_POINT(first).x << " " << height - START_POINT(first).y;
+        nNodes++;
+        for (this_spline = 0; this_spline < SPLINE_LIST_LENGTH(list); this_spline++) {
+            at_spline_type s = SPLINE_LIST_ELT(list, this_spline);
+
+            if (SPLINE_DEGREE(s) == AT_LINEARTYPE) {
+                thePath << "L" << END_POINT(s).x << " " << height - END_POINT(s).y;
+                nNodes++;
+            }
+            else {
+                thePath << "C" << CONTROL1(s).x << " " << height - CONTROL1(s).y << " " << CONTROL2(s).x << " "
+                        << height - CONTROL2(s).y << " " << END_POINT(s).x << " " << height - END_POINT(s).y;
+                nNodes++;
+            }
+            last_color = list.color;
+        }
+    }
+    if (!(spline.centerline || list.open))
+        thePath << "z";
+    nNodes++;
+    if (SPLINE_LIST_ARRAY_LENGTH(spline) > 0) {
+        TracingEngineResult ter(theStyle.str(), thePath.str(), nNodes);
+        res.push_back(ter);
+        theStyle.clear();
+        thePath.clear();
+        nNodes = 0;
+    }
+
+    return res;
+}
+
+
+/**
+ *  Abort the thread that is executing getPathDataFromPixbuf()
+ */
+void AutotraceTracingEngine::abort()
+{
+    // g_message("PotraceTracingEngine::abort()\n");
+    keepGoing = 0;
+}
+
+
+
+} // namespace Autotrace
+} // namespace Trace
+} // namespace Inkscape
+
+/*
+  Local Variables:
+  mode:c++
+  c-file-style:"stroustrup"
+  c-file-offsets:((innamespace . 0)(inline-open . 0))
+  indent-tabs-mode:nil
+  fill-column:99
+  End:
+*/
+// vim: expandtab:shiftwidth=4:tabstop=8:softtabstop=4 :