Merge pull request #4113 from mapnik/svg-fixes

Svg fixes

deps/agg/src/agg_bezier_arc.cpp

@@ -22,7 +22,6 @@
 #include <math.h>
 #include "agg_bezier_arc.h"
 
-
 namespace agg
 {
 
@@ -144,7 +143,7 @@ void bezier_arc_svg::init(double x0, double y0,
     m_radii_ok = true;
 
     if(rx < 0.0) rx = -rx;
-    if(ry < 0.0) ry = -rx;
+    if(ry < 0.0) ry = -ry;
 
     // Calculate the middle point between
     // the current and the final points
@@ -178,7 +177,6 @@ void bezier_arc_svg::init(double x0, double y0,
         pry = ry * ry;
         if(radii_check > 10.0) m_radii_ok = false;
     }
-
     // Calculate (cx1, cy1)
     //------------------------
     double sign = (large_arc_flag == sweep_flag) ? -1.0 : 1.0;
@@ -222,12 +220,12 @@ void bezier_arc_svg::init(double x0, double y0,
     if(v < -1.0) v = -1.0;
     if(v >  1.0) v =  1.0;
     double sweep_angle = sign * std::acos(v);
+    if (std::fabs(sweep_angle) < pi * 1e-6) m_radii_ok = false;
     if(!sweep_flag && sweep_angle > 0)
     {
         sweep_angle -= pi * 2.0;
     }
-    else
+    else if (sweep_flag && sweep_angle < 0)
-        if (sweep_flag && sweep_angle < 0)
     {
         sweep_angle += pi * 2.0;
     }

include/mapnik/svg/svg_path_adapter.hpp

@@ -444,12 +444,13 @@ void path_adapter<VC>::curve3(double x_to, double y_to)
 {
     double x0;
     double y0;
-    if(is_vertex(vertices_.last_vertex(&x0, &y0)))
+    unsigned last_cmd = last_vertex(&x0, &y0);
+    if (is_vertex(last_cmd))
     {
         double x_ctrl;
         double y_ctrl;
-        unsigned cmd = vertices_.prev_vertex(&x_ctrl, &y_ctrl);
+        unsigned prev_cmd = prev_vertex(&x_ctrl, &y_ctrl);
-        if(is_curve(cmd))
+        if (is_curve(last_cmd) && is_curve(prev_cmd))
         {
             x_ctrl = x0 + x0 - x_ctrl;
             y_ctrl = y0 + y0 - y_ctrl;
@@ -491,9 +492,7 @@ void path_adapter<VC>::curve4_rel(double dx_ctrl1, double dy_ctrl1,
     rel_to_abs(&dx_ctrl1, &dy_ctrl1);
     rel_to_abs(&dx_ctrl2, &dy_ctrl2);
     rel_to_abs(&dx_to,    &dy_to);
-    vertices_.add_vertex(dx_ctrl1, dy_ctrl1, path_cmd_curve4);
+    curve4(dx_ctrl1, dy_ctrl1, dx_ctrl2, dy_ctrl2, dx_to, dy_to);
-    vertices_.add_vertex(dx_ctrl2, dy_ctrl2, path_cmd_curve4);
-    vertices_.add_vertex(dx_to,    dy_to,    path_cmd_curve4);
 }
 
 //------------------------------------------------------------------------
@@ -503,12 +502,13 @@ void path_adapter<VC>::curve4(double x_ctrl2, double y_ctrl2,
 {
     double x0;
     double y0;
-    if(is_vertex(last_vertex(&x0, &y0)))
+    unsigned last_cmd = last_vertex(&x0, &y0);
+    if (is_vertex(last_cmd))
     {
         double x_ctrl1;
         double y_ctrl1;
-        unsigned cmd = prev_vertex(&x_ctrl1, &y_ctrl1);
+        unsigned prev_cmd = prev_vertex(&x_ctrl1, &y_ctrl1);
-        if(is_curve(cmd))
+        if (is_curve(last_cmd) && is_curve(prev_cmd))
         {
             x_ctrl1 = x0 + x0 - x_ctrl1;
             y_ctrl1 = y0 + y0 - y_ctrl1;

include/mapnik/svg/svg_path_grammar_x3_def.hpp

@@ -111,7 +111,8 @@ auto const curve3 = [] (auto const& ctx)
 auto const curve3_smooth = [] (auto const& ctx)
 {
     auto const& attr = _attr(ctx);
-    extract_path(ctx).curve3(std::get<0>(attr),std::get<1>(attr),
+    extract_path(ctx).curve3(std::get<0>(attr),
+                             std::get<1>(attr),
                              x3::get<relative_tag>(ctx));
 };
 

src/svg/svg_parser.cpp

@@ -602,7 +602,7 @@ void parse_fill(svg_parser& parser, char const* value)
             traverse_tree(parser, gradient_node);
             if (parser.gradient_map_.count(id) > 0)
             {
-                parser.path_.add_stroke_gradient(parser.gradient_map_[id]);
+                parser.path_.add_fill_gradient(parser.gradient_map_[id]);
             }
             else
             {
@@ -1360,7 +1360,6 @@ void parse_radial_gradient(svg_parser & parser, rapidxml::xml_node<char> const*
         }
     }
     parser.gradient_map_[id] = gr;
-    //MAPNIK_LOG_DEBUG(svg_parser) << "Found Radial Gradient: " << " " << cx << " " << cy << " " << fx << " " << fy << " " << r;
 }
 
 void parse_linear_gradient(svg_parser & parser, rapidxml::xml_node<char> const* node)

test/data-visual

@@ -1 +1 @@
-Subproject commit 901ee22d4cdbe1a7caff3f92e10f38ec784b9caa
+Subproject commit 54a2c2595c81e838810e413d42a57f09fcf41331

test/unit/svg/svg_path_parser_test.cpp

@@ -161,4 +161,33 @@ TEST_CASE("SVG path parser") {
             std::make_tuple(1050, 125, 2)};
         test_path_parser(str, expected);
     }
+
+    SECTION("Quadratic Bézier")
+    {
+        std::string str = "M200,300 Q400,50 600,300 T1000,300";
+
+        std::vector<std::tuple<double,double,unsigned>> expected = {
+            std::make_tuple(200,  300, 1),
+            std::make_tuple(400,   50, 3),
+            std::make_tuple(600,  300, 3),
+            std::make_tuple(800,  550, 3),
+            std::make_tuple(1000, 300, 3)};
+        test_path_parser(str, expected);
+    }
+
+    SECTION("Cubic Bézier")
+    {
+        std::string str = "M100,200 C100,100 250,100 250,200S400,300 400,200";
+
+        std::vector<std::tuple<double,double,unsigned>> expected = {
+            std::make_tuple(100, 200, 1),
+            std::make_tuple(100, 100, 4),
+            std::make_tuple(250, 100, 4),
+            std::make_tuple(250, 200, 4),
+            std::make_tuple(250, 300, 4),
+            std::make_tuple(400, 300, 4),
+            std::make_tuple(400, 200, 4)};
+
+        test_path_parser(str, expected);
+    }
 }

utils/svg2png/svg2png.cpp

@@ -24,6 +24,7 @@
 #include <sstream>
 #include <vector>
 #include <string>
+#include <cmath>
 
 #include <mapnik/version.hpp>
 #include <mapnik/debug.hpp>
@@ -54,9 +55,11 @@
 struct main_marker_visitor
 {
     main_marker_visitor(std::string const& svg_name,
+                        double scale_factor,
                         bool verbose,
                         bool auto_open)
         : svg_name_(svg_name),
+          scale_factor_(scale_factor),
           verbose_(verbose),
           auto_open_(auto_open) {}
 
@@ -71,17 +74,33 @@ struct main_marker_visitor
         double opacity = 1;
         double w, h;
         std::tie(w, h) = marker.dimensions();
+
+
+        double svg_width = w * scale_factor_;
+        double svg_height = h * scale_factor_;
+
+        int output_width = static_cast<int>(std::round(svg_width));
+        int output_height = static_cast<int>(std::round(svg_height));
         if (verbose_)
         {
-            std::clog << "found width of '" << w << "' and height of '" << h << "'\n";
+            std::clog << "Found width of '" << w << "' and height of '" << h << "'\n";
+            auto b = marker.bounding_box();
+            std::clog << "SVG BBOX:" << b << std::endl;
+            std::clog << "Output image dimensions:[" << output_width << "," << output_height << "]" << std::endl;
         }
-        mapnik::image_rgba8 im(static_cast<int>(w + 0.5), static_cast<int>(h + 0.5));
+        mapnik::image_rgba8 im(output_width, output_height, true, true);
         agg::rendering_buffer buf(im.bytes(), im.width(), im.height(), im.row_size());
         pixfmt pixf(buf);
         renderer_base renb(pixf);
 
-        mapnik::box2d<double> const& bbox = {0, 0, w, h};
+        mapnik::box2d<double> const& bbox = {0, 0, svg_width, svg_height};
-        agg::trans_affine mtx = {};
+        // center the svg marker on '0,0'
+        agg::trans_affine mtx = agg::trans_affine_translation(-0.5 * w, -0.5 * h);
+        // Scale the image
+        mtx.scale(scale_factor_);
+        // render the marker at the center of the marker box
+        mtx.translate(0.5 * svg_width, 0.5 * svg_height);
+
         mapnik::svg::vertex_stl_adapter<mapnik::svg::svg_path_storage> stl_storage(marker.get_data()->source());
         mapnik::svg::svg_path_adapter svg_path(stl_storage);
         mapnik::svg::renderer_agg<
@@ -124,6 +143,7 @@ struct main_marker_visitor
 
   private:
     std::string svg_name_;
+    double scale_factor_ = 1.0;
     bool verbose_;
     bool auto_open_;
 };
@@ -138,7 +158,8 @@ int main (int argc,char** argv)
     int status = 0;
     std::vector<std::string> svg_files;
     mapnik::logger::instance().set_severity(mapnik::logger::error);
-
+    double scale_factor = 1.0;
+    std::string usage = "Usage: svg2png [options] <svg-file(s)>";
     try
     {
         po::options_description desc("svg2png utility");
@@ -148,6 +169,7 @@ int main (int argc,char** argv)
             ("verbose,v","verbose output")
             ("open,o","automatically open the file after rendering (os x only)")
             ("strict,s","enables strict SVG parsing")
+            ("scale-factor", po::value<double>(), "provide scaling factor (default: 1.0)")
             ("svg",po::value<std::vector<std::string> >(),"svg file to read")
             ;
 
@@ -166,6 +188,7 @@ int main (int argc,char** argv)
         if (vm.count("help"))
         {
             std::clog << desc << std::endl;
+            std::clog << usage << std::endl;
             return 1;
         }
 
@@ -183,24 +206,26 @@ int main (int argc,char** argv)
         {
             strict = true;
         }
-
+        if (vm.count("scale-factor"))
+        {
+            scale_factor = vm["scale-factor"].as<double>();
+        }
         if (vm.count("svg"))
         {
             svg_files=vm["svg"].as< std::vector<std::string> >();
         }
         else
         {
-            std::clog << "please provide an svg file!" << std::endl;
+            std::clog << usage << std::endl;
             return -1;
         }
 
         std::vector<std::string>::const_iterator itr = svg_files.begin();
         if (itr == svg_files.end())
         {
-            std::clog << "no svg files to render" << std::endl;
+            std::clog << usage << std::endl;
             return 0;
         }
-
         while (itr != svg_files.end())
         {
             std::string svg_name (*itr++);
@@ -209,7 +234,7 @@ int main (int argc,char** argv)
                 std::clog << "found: " << svg_name << "\n";
             }
             std::shared_ptr<mapnik::marker const> marker = mapnik::marker_cache::instance().find(svg_name, false, strict);
-            main_marker_visitor visitor(svg_name, verbose, auto_open);
+            main_marker_visitor visitor(svg_name, scale_factor, verbose, auto_open);
             status = mapnik::util::apply_visitor(visitor, *marker);
         }
     }