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// 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 :
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