Polygon pattern on line geometries for AGG backend

include/mapnik/agg/render_polygon_pattern.hpp

@@ -0,0 +1,156 @@
+/*****************************************************************************
+ *
+ * This file is part of Mapnik (c++ mapping toolkit)
+ *
+ * Copyright (C) 2017 Artem Pavlenko
+ *
+ * This library is free software; you can redistribute it and/or
+ * modify it under the terms of the GNU Lesser General Public
+ * License as published by the Free Software Foundation; either
+ * version 2.1 of the License, or (at your option) any later version.
+ *
+ * This library is distributed in the hope that it will be useful,
+ * but WITHOUT ANY WARRANTY; without even the implied warranty of
+ * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the GNU
+ * Lesser General Public License for more details.
+ *
+ * You should have received a copy of the GNU Lesser General Public
+ * License along with this library; if not, write to the Free Software
+ * Foundation, Inc., 51 Franklin St, Fifth Floor, Boston, MA  02110-1301  USA
+ *
+ *****************************************************************************/
+
+#ifndef MAPNIK_RENDER_POLYGON_PATTERN_HPP
+#define MAPNIK_RENDER_POLYGON_PATTERN_HPP
+
+#include <mapnik/symbolizer.hpp>
+#include <mapnik/vertex_processor.hpp>
+#include <mapnik/renderer_common/pattern_alignment.hpp>
+#include <mapnik/renderer_common/apply_vertex_converter.hpp>
+#include <mapnik/renderer_common/clipping_extent.hpp>
+#include <mapnik/vertex_converters.hpp>
+
+#pragma GCC diagnostic push
+#include <mapnik/warning_ignore_agg.hpp>
+#include "agg_basics.h"
+#include "agg_rendering_buffer.h"
+#include "agg_pixfmt_rgba.h"
+#include "agg_color_rgba.h"
+#include "agg_rasterizer_scanline_aa.h"
+#include "agg_scanline_u.h"
+#include "agg_renderer_scanline.h"
+#include "agg_span_allocator.h"
+#include "agg_span_pattern_rgba.h"
+#include "agg_image_accessors.h"
+#include "agg_conv_clip_polygon.h"
+#pragma GCC diagnostic pop
+
+namespace mapnik {
+
+struct agg_pattern_base
+{
+    image_rgba8 const& pattern_img_;
+    renderer_common const& common_;
+    symbolizer_base const& sym_;
+    mapnik::feature_impl const& feature_;
+    proj_transform const& prj_trans_;
+
+    agg::trans_affine geom_transform() const
+    {
+        agg::trans_affine tr;
+        auto transform = get_optional<transform_type>(sym_, keys::geometry_transform);
+        if (transform)
+        {
+            evaluate_transform(tr, feature_, common_.vars_, *transform, common_.scale_factor_);
+        }
+        return tr;
+    }
+};
+
+template <typename VertexConverter>
+struct agg_polygon_pattern : agg_pattern_base
+{
+    using color_type = agg::rgba8;
+    using order_type = agg::order_rgba;
+    using blender_type = agg::comp_op_adaptor_rgba_pre<color_type, order_type>;
+    using pixfmt_type = agg::pixfmt_custom_blend_rgba<blender_type, agg::rendering_buffer>;
+    using wrap_x_type = agg::wrap_mode_repeat;
+    using wrap_y_type = agg::wrap_mode_repeat;
+    using img_source_type = agg::image_accessor_wrap<agg::pixfmt_rgba32_pre,
+                                                     wrap_x_type,
+                                                     wrap_y_type>;
+    using span_gen_type = agg::span_pattern_rgba<img_source_type>;
+    using renderer_base = agg::renderer_base<pixfmt_type>;
+    using renderer_type = agg::renderer_scanline_aa_alpha<renderer_base,
+                                                          agg::span_allocator<agg::rgba8>,
+                                                          span_gen_type>;
+
+    agg_polygon_pattern(image_rgba8 const& pattern_img,
+                        renderer_common const& common,
+                        symbolizer_base const& sym,
+                        mapnik::feature_impl const& feature,
+                        proj_transform const& prj_trans)
+        : agg_pattern_base{pattern_img, common, sym, feature, prj_trans},
+          clip_(get<value_bool, keys::clip>(sym_, feature_, common_.vars_)),
+          clip_box_(clipping_extent(common)),
+          tr_(geom_transform()),
+          converter_(clip_box_, sym, common.t_, prj_trans, tr_,
+                     feature, common.vars_, common.scale_factor_)
+    {
+        value_double simplify_tolerance = get<value_double, keys::simplify_tolerance>(sym_, feature_, common_.vars_);
+        value_double smooth = get<value_double, keys::smooth>(sym_, feature_, common_.vars_);
+
+        if (simplify_tolerance > 0.0) converter_.template set<simplify_tag>();
+        converter_.template set<affine_transform_tag>();
+        if (smooth > 0.0) converter_.template set<smooth_tag>();
+    }
+
+    void render(renderer_base & ren_base, rasterizer & ras)
+    {
+        pattern_alignment_enum alignment = get<pattern_alignment_enum, keys::alignment>(
+                sym_, feature_, common_.vars_);
+        unsigned offset_x=0;
+        unsigned offset_y=0;
+
+        if (alignment == LOCAL_ALIGNMENT)
+        {
+            double x0 = 0;
+            double y0 = 0;
+            using apply_local_alignment = detail::apply_local_alignment;
+            apply_local_alignment apply(common_.t_, prj_trans_, clip_box_, x0, y0);
+            util::apply_visitor(geometry::vertex_processor<apply_local_alignment>(apply), feature_.get_geometry());
+
+            offset_x = unsigned(ren_base.width() - x0);
+            offset_y = unsigned(ren_base.height() - y0);
+        }
+
+        agg::rendering_buffer pattern_rbuf((agg::int8u*)pattern_img_.bytes(),
+                                           pattern_img_.width(), pattern_img_.height(),
+                                           pattern_img_.width() * 4);
+        agg::pixfmt_rgba32_pre pixf_pattern(pattern_rbuf);
+        img_source_type img_src(pixf_pattern);
+        span_gen_type sg(img_src, offset_x, offset_y);
+
+        agg::span_allocator<agg::rgba8> sa;
+        value_double opacity = get<double, keys::opacity>(sym_, feature_, common_.vars_);
+        renderer_type rp(ren_base, sa, sg, unsigned(opacity * 255));
+
+        using apply_vertex_converter_type = detail::apply_vertex_converter<
+            VertexConverter, rasterizer>;
+        using vertex_processor_type = geometry::vertex_processor<apply_vertex_converter_type>;
+        apply_vertex_converter_type apply(converter_, ras);
+        mapnik::util::apply_visitor(vertex_processor_type(apply), feature_.get_geometry());
+        agg::scanline_u8 sl;
+        agg::render_scanlines(ras, sl, rp);
+    }
+
+    const bool clip_;
+    const box2d<double> clip_box_;
+    const agg::trans_affine tr_;
+    VertexConverter converter_;
+};
+
+} // namespace mapnik
+
+
+#endif // MAPNIK_RENDER_POLYGON_PATTERN_HPP

include/mapnik/renderer_common/pattern_alignment.hpp

@@ -25,6 +25,13 @@
 #define MAPNIK_PATTERN_ALIGNMENT_HPP
 
 #include <mapnik/geometry.hpp>
+#include <mapnik/vertex_adapters.hpp>
+#include <mapnik/transform_path_adapter.hpp>
+
+#pragma GCC diagnostic push
+#include <mapnik/warning_ignore_agg.hpp>
+#include "agg_conv_clip_polygon.h"
+#pragma GCC diagnostic pop
 
 namespace mapnik { namespace detail {
 

include/mapnik/symbolizer.hpp

@@ -94,7 +94,8 @@ enum class property_types : std::uint8_t
     target_vertical_alignment,
     target_upright,
     target_direction,
-    target_font_feature_settings
+    target_font_feature_settings,
+    target_line_pattern,
 };
 
 template <typename T>
@@ -189,6 +190,7 @@ ENUM_FROM_STRING( text_transform_enum )
 ENUM_FROM_STRING( text_upright_enum )
 ENUM_FROM_STRING( direction_enum )
 ENUM_FROM_STRING( gamma_method_enum )
+ENUM_FROM_STRING( line_pattern_enum )
 
 // enum
 template <typename T, bool is_enum = true>

include/mapnik/symbolizer_default_values.hpp

@@ -369,6 +369,13 @@ struct symbolizer_default<value_bool, keys::avoid_edges>
 
 // font-feature-settings
 
+// line-pattern
+template <>
+struct symbolizer_default<line_pattern_enum, keys::line_pattern>
+{
+    static line_pattern_enum value() { return LINE_PATTERN_WARP; }
+};
+
 // extend
 template <>
 struct symbolizer_default<value_double, keys::extend>

include/mapnik/symbolizer_enumerations.hpp

@@ -222,6 +222,14 @@ enum gamma_method_enum : std::uint8_t
 
 DEFINE_ENUM (gamma_method_e, gamma_method_enum );
 
+enum line_pattern_enum : std::uint8_t
+{
+    LINE_PATTERN_WARP,
+    LINE_PATTERN_REPEAT,
+    line_pattern_enum_MAX
+};
+
+DEFINE_ENUM (line_pattern_e, line_pattern_enum );
 
 }
 

include/mapnik/symbolizer_keys.hpp

@@ -93,6 +93,7 @@ enum class keys : std::uint8_t
     avoid_edges,
     ff_settings,
     extend,
+    line_pattern,
     MAX_SYMBOLIZER_KEY
 };
 

src/agg/process_line_pattern_symbolizer.cpp

@@ -27,15 +27,15 @@
 #include <mapnik/agg_renderer.hpp>
 #include <mapnik/agg_rasterizer.hpp>
 #include <mapnik/agg_pattern_source.hpp>
+#include <mapnik/agg/render_polygon_pattern.hpp>
 #include <mapnik/marker.hpp>
 #include <mapnik/marker_cache.hpp>
 #include <mapnik/symbolizer.hpp>
-#include <mapnik/vertex_converters.hpp>
 #include <mapnik/vertex_processor.hpp>
-#include <mapnik/util/noncopyable.hpp>
 #include <mapnik/parse_path.hpp>
 #include <mapnik/renderer_common/clipping_extent.hpp>
 #include <mapnik/renderer_common/render_pattern.hpp>
+#include <mapnik/renderer_common/pattern_alignment.hpp>
 #include <mapnik/renderer_common/apply_vertex_converter.hpp>
 
 
@@ -53,22 +53,139 @@
 #include "agg_span_allocator.h"
 #include "agg_span_pattern_rgba.h"
 #include "agg_renderer_outline_image.h"
+#include "agg_image_accessors.h"
 #pragma GCC diagnostic pop
 
 namespace mapnik {
 
+namespace {
+
+template <typename... Converters>
+using vertex_converter_type = vertex_converter<clip_line_tag,
+                                               transform_tag,
+                                               affine_transform_tag,
+                                               simplify_tag,
+                                               smooth_tag,
+                                               offset_transform_tag,
+                                               Converters...>;
+
+struct warp_pattern : agg_pattern_base
+{
+    using vc_type = vertex_converter_type<>;
+    using color_type = agg::rgba8;
+    using order_type = agg::order_rgba;
+    using blender_type = agg::comp_op_adaptor_rgba_pre<color_type, order_type>;
+    using pattern_filter_type = agg::pattern_filter_bilinear_rgba8;
+    using pattern_type = agg::line_image_pattern<pattern_filter_type>;
+    using pixfmt_type = agg::pixfmt_custom_blend_rgba<blender_type, agg::rendering_buffer>;
+    using renderer_base = agg::renderer_base<pixfmt_type>;
+    using renderer_type = agg::renderer_outline_image<renderer_base, pattern_type>;
+    using rasterizer_type = agg::rasterizer_outline_aa<renderer_type>;
+
+    warp_pattern(image_rgba8 const& pattern_img,
+                 renderer_common const& common,
+                 symbolizer_base const& sym,
+                 mapnik::feature_impl const& feature,
+                 proj_transform const& prj_trans)
+        : agg_pattern_base{pattern_img, common, sym, feature, prj_trans},
+          clip_(get<value_bool, keys::clip>(sym, feature, common.vars_)),
+          offset_(get<value_double, keys::offset>(sym, feature, common.vars_)),
+          clip_box_(clip_box()),
+          tr_(geom_transform()),
+          converter_(clip_box_, sym, common.t_, prj_trans, tr_,
+                     feature, common.vars_, common.scale_factor_)
+    {
+        value_double simplify_tolerance = get<value_double, keys::simplify_tolerance>(sym_, feature_, common_.vars_);
+        value_double smooth = get<value_double, keys::smooth>(sym_, feature_, common_.vars_);
+
+        if (std::fabs(offset_) > 0.0) converter_.template set<offset_transform_tag>();
+        if (simplify_tolerance > 0.0) converter_.template set<simplify_tag>();
+        converter_.template set<affine_transform_tag>();
+        if (smooth > 0.0) converter_.template set<smooth_tag>();
+    }
+
+    box2d<double> clip_box() const
+    {
+        box2d<double> clip_box = clipping_extent(common_);
+        if (clip_)
+        {
+            double pad_per_pixel = static_cast<double>(common_.query_extent_.width() / common_.width_);
+            double pixels = std::ceil(std::max(pattern_img_.width() / 2.0 + std::fabs(offset_),
+                                              (std::fabs(offset_) * offset_converter_default_threshold)));
+            double padding = pad_per_pixel * pixels * common_.scale_factor_;
+            clip_box.pad(padding);
+        }
+        return clip_box;
+    }
+
+    void render(renderer_base & ren_base, rasterizer &)
+    {
+        value_double opacity = get<double, keys::opacity>(sym_, feature_, common_.vars_);
+        agg::pattern_filter_bilinear_rgba8 filter;
+        pattern_source source(pattern_img_, opacity);
+        pattern_type pattern (filter, source);
+        renderer_type ren(ren_base, pattern);
+        double half_stroke = std::max(pattern_img_.width() / 2.0, pattern_img_.height() / 2.0);
+        int rast_clip_padding = static_cast<int>(std::round(half_stroke));
+        ren.clip_box(-rast_clip_padding, -rast_clip_padding,
+                     common_.width_ + rast_clip_padding,
+                     common_.height_ + rast_clip_padding);
+        rasterizer_type ras(ren);
+
+        using apply_vertex_converter_type = detail::apply_vertex_converter<
+            vc_type, rasterizer_type>;
+        using vertex_processor_type = geometry::vertex_processor<apply_vertex_converter_type>;
+        apply_vertex_converter_type apply(converter_, ras);
+
+        util::apply_visitor(vertex_processor_type(apply), feature_.get_geometry());
+    }
+
+    const bool clip_;
+    const double offset_;
+    const box2d<double> clip_box_;
+    const agg::trans_affine tr_;
+    vc_type converter_;
+};
+
+using repeat_pattern_base = agg_polygon_pattern<vertex_converter_type<dash_tag,
+                                                                      stroke_tag>>;
+struct repeat_pattern : repeat_pattern_base
+{
+    using repeat_pattern_base::agg_polygon_pattern;
+
+    void render(renderer_base & ren_base, rasterizer & ras)
+    {
+        if (has_key(sym_, keys::stroke_dasharray))
+        {
+            converter_.set<dash_tag>();
+        }
+
+        if (clip_) converter_.template set<clip_line_tag>();
+
+        value_double offset = get<value_double, keys::offset>(sym_, feature_, common_.vars_);
+        if (std::fabs(offset) > 0.0) converter_.template set<offset_transform_tag>();
+
+        // To allow lines cross themselves.
+        ras.filling_rule(agg::fill_non_zero);
+
+        repeat_pattern_base::render(ren_base, ras);
+    }
+};
+
+}
+
 template <typename buffer_type>
 struct agg_renderer_process_visitor_l
 {
-    agg_renderer_process_visitor_l(renderer_common & common,
+    agg_renderer_process_visitor_l(renderer_common const& common,
                                  buffer_type & current_buffer,
-                                 std::unique_ptr<rasterizer> const& ras_ptr,
+                                 rasterizer & ras,
                                  line_pattern_symbolizer const& sym,
-                                 mapnik::feature_impl & feature,
+                                 mapnik::feature_impl const& feature,
                                  proj_transform const& prj_trans)
         : common_(common),
           current_buffer_(current_buffer),
-          ras_ptr_(ras_ptr),
+          ras_(ras),
           sym_(sym),
           feature_(feature),
           prj_trans_(prj_trans) {}
@@ -82,88 +199,57 @@ struct agg_renderer_process_visitor_l
         if (image_transform) evaluate_transform(image_tr, feature_, common_.vars_, *image_transform, common_.scale_factor_);
         mapnik::box2d<double> const& bbox_image = marker.get_data()->bounding_box() * image_tr;
         image_rgba8 image(bbox_image.width(), bbox_image.height());
-        render_pattern<buffer_type>(*ras_ptr_, marker, image_tr, 1.0, image);
+        render_pattern<buffer_type>(ras_, marker, image_tr, 1.0, image);
-        render(image, marker.width(), marker.height());
+        render_by_pattern_type(image);
     }
 
     void operator() (marker_rgba8 const& marker) const
     {
-        render(marker.get_data(), marker.width(), marker.height());
+        render_by_pattern_type(marker.get_data());
     }
 
 private:
-    void render(mapnik::image_rgba8 const& marker, double width, double height) const
+    void render_by_pattern_type(image_rgba8 const& pattern_image) const
     {
-        using col = agg::rgba8;
+        line_pattern_enum pattern = get<line_pattern_enum, keys::line_pattern>(sym_, feature_, common_.vars_);
-        using order = agg::order_rgba;
+        switch (pattern)
-        using blender_type = agg::comp_op_adaptor_rgba_pre<col, order>;
+        {
-        using pattern_filter_type = agg::pattern_filter_bilinear_rgba8;
+            case LINE_PATTERN_WARP:
-        using pattern_type = agg::line_image_pattern<pattern_filter_type>;
+            {
-        using pixfmt_type = agg::pixfmt_custom_blend_rgba<blender_type, agg::rendering_buffer>;
+                warp_pattern pattern(pattern_image, common_, sym_, feature_, prj_trans_);
-        using renderer_base = agg::renderer_base<pixfmt_type>;
+                render(pattern);
-        using renderer_type = agg::renderer_outline_image<renderer_base, pattern_type>;
+                break;
-        using rasterizer_type = agg::rasterizer_outline_aa<renderer_type>;
+            }
-
+            case LINE_PATTERN_REPEAT:
-        value_double opacity = get<value_double, keys::opacity>(sym_, feature_, common_.vars_);
+            {
-        value_bool clip = get<value_bool, keys::clip>(sym_, feature_, common_.vars_);
+                repeat_pattern pattern(pattern_image, common_, sym_, feature_, prj_trans_);
-        value_double offset = get<value_double, keys::offset>(sym_, feature_, common_.vars_);
+                render(pattern);
-        value_double simplify_tolerance = get<value_double, keys::simplify_tolerance>(sym_, feature_, common_.vars_);
+                break;
-        value_double smooth = get<value_double, keys::smooth>(sym_, feature_, common_.vars_);
+            }
+            case line_pattern_enum_MAX:
+            default:
+                MAPNIK_LOG_ERROR(process_line_pattern_symbolizer) << "Incorrect line-pattern value.";
+        }
+    }
 
+    template <typename Pattern>
+    void render(Pattern & pattern) const
+    {
         agg::rendering_buffer buf(current_buffer_.bytes(), current_buffer_.width(),
                                   current_buffer_.height(), current_buffer_.row_size());
-        pixfmt_type pixf(buf);
+        typename Pattern::pixfmt_type pixf(buf);
         pixf.comp_op(static_cast<agg::comp_op_e>(get<composite_mode_e, keys::comp_op>(sym_, feature_, common_.vars_)));
-        renderer_base ren_base(pixf);
+        typename Pattern::renderer_base ren_base(pixf);
-        agg::pattern_filter_bilinear_rgba8 filter;
 
-        pattern_source source(marker, opacity);
+        if (pattern.clip_) pattern.converter_.template set<clip_line_tag>();
-        pattern_type pattern (filter,source);
+        pattern.render(ren_base, ras_);
-        renderer_type ren(ren_base, pattern);
-        double half_stroke = std::max(width / 2.0, height / 2.0);
-        int rast_clip_padding = static_cast<int>(std::round(half_stroke));
-        ren.clip_box(-rast_clip_padding,-rast_clip_padding,common_.width_+rast_clip_padding,common_.height_+rast_clip_padding);
-        rasterizer_type ras(ren);
-
-        agg::trans_affine tr;
-        auto transform = get_optional<transform_type>(sym_, keys::geometry_transform);
-        if (transform) evaluate_transform(tr, feature_, common_.vars_, *transform, common_.scale_factor_);
-
-        box2d<double> clip_box = clipping_extent(common_);
-        if (clip)
-        {
-            double pad_per_pixel = static_cast<double>(common_.query_extent_.width()/common_.width_);
-            double pixels = std::ceil(std::max(width / 2.0 + std::fabs(offset),
-                                              (std::fabs(offset) * offset_converter_default_threshold)));
-            double padding = pad_per_pixel * pixels * common_.scale_factor_;
-
-            clip_box.pad(padding);
-        }
-        using vertex_converter_type = vertex_converter<clip_line_tag, transform_tag,
-                                                       affine_transform_tag,
-                                                       simplify_tag,smooth_tag,
-                                                       offset_transform_tag>;
-
-        vertex_converter_type converter(clip_box,sym_,common_.t_,prj_trans_,tr,feature_,common_.vars_,common_.scale_factor_);
-
-        if (clip) converter.set<clip_line_tag>();
-        converter.set<transform_tag>(); //always transform
-        if (simplify_tolerance > 0.0) converter.set<simplify_tag>(); // optional simplify converter
-        if (std::fabs(offset) > 0.0) converter.set<offset_transform_tag>(); // parallel offset
-        converter.set<affine_transform_tag>(); // optional affine transform
-        if (smooth > 0.0) converter.set<smooth_tag>(); // optional smooth converter
-
-        using apply_vertex_converter_type = detail::apply_vertex_converter<vertex_converter_type, rasterizer_type>;
-        using vertex_processor_type = geometry::vertex_processor<apply_vertex_converter_type>;
-        apply_vertex_converter_type apply(converter, ras);
-        mapnik::util::apply_visitor(vertex_processor_type(apply), feature_.get_geometry());
     }
 
-    renderer_common & common_;
+    renderer_common const& common_;
     buffer_type & current_buffer_;
-    std::unique_ptr<rasterizer> const& ras_ptr_;
+    rasterizer & ras_;
     line_pattern_symbolizer const& sym_;
-    mapnik::feature_impl & feature_;
+    mapnik::feature_impl const& feature_;
     proj_transform const& prj_trans_;
 };
 
@@ -172,8 +258,6 @@ void  agg_renderer<T0,T1>::process(line_pattern_symbolizer const& sym,
                                mapnik::feature_impl & feature,
                                proj_transform const& prj_trans)
 {
-
-
     std::string filename = get<std::string, keys::file>(sym, feature, common_.vars_);
     if (filename.empty()) return;
     ras_ptr->reset();
@@ -183,10 +267,11 @@ void  agg_renderer<T0,T1>::process(line_pattern_symbolizer const& sym,
         gamma_method_ = GAMMA_POWER;
         gamma_ = 1.0;
     }
+
     std::shared_ptr<mapnik::marker const> marker = marker_cache::instance().find(filename, true);
     agg_renderer_process_visitor_l<buffer_type> visitor(common_,
                                          buffers_.top().get(),
-                                         ras_ptr,
+                                         *ras_ptr,
                                          sym,
                                          feature,
                                          prj_trans);

src/agg/process_polygon_pattern_symbolizer.cpp

@@ -26,6 +26,7 @@
 #include <mapnik/agg_renderer.hpp>
 #include <mapnik/agg_helpers.hpp>
 #include <mapnik/agg_rasterizer.hpp>
+#include <mapnik/agg/render_polygon_pattern.hpp>
 #include <mapnik/marker.hpp>
 #include <mapnik/marker_cache.hpp>
 #include <mapnik/vertex_converters.hpp>
@@ -35,10 +36,7 @@
 #include <mapnik/svg/svg_converter.hpp>
 #include <mapnik/svg/svg_renderer_agg.hpp>
 #include <mapnik/svg/svg_path_adapter.hpp>
-#include <mapnik/renderer_common/clipping_extent.hpp>
 #include <mapnik/renderer_common/render_pattern.hpp>
-#include <mapnik/renderer_common/apply_vertex_converter.hpp>
-#include <mapnik/renderer_common/pattern_alignment.hpp>
 
 #pragma GCC diagnostic push
 #include <mapnik/warning_ignore_agg.hpp>
@@ -111,86 +109,30 @@ private:
             gamma_ = gamma;
         }
 
-        value_bool clip = get<value_bool, keys::clip>(sym_, feature_, common_.vars_);
-        value_double opacity = get<double, keys::opacity>(sym_, feature_, common_.vars_);
-        value_double simplify_tolerance = get<value_double, keys::simplify_tolerance>(sym_, feature_, common_.vars_);
-        value_double smooth = get<value_double, keys::smooth>(sym_, feature_, common_.vars_);
-
-        box2d<double> clip_box = clipping_extent(common_);
-
-        using col = agg::rgba8;
-        using order = agg::order_rgba;
-        using blender_type = agg::comp_op_adaptor_rgba_pre<col, order>;
-        using pixfmt_type = agg::pixfmt_custom_blend_rgba<blender_type, agg::rendering_buffer>;
-
-        using wrap_x_type = agg::wrap_mode_repeat;
-        using wrap_y_type = agg::wrap_mode_repeat;
-        using img_source_type = agg::image_accessor_wrap<agg::pixfmt_rgba32_pre,
-                                                         wrap_x_type,
-                                                         wrap_y_type>;
-
-        using span_gen_type = agg::span_pattern_rgba<img_source_type>;
-        using ren_base = agg::renderer_base<pixfmt_type>;
-
-        using renderer_type = agg::renderer_scanline_aa_alpha<ren_base,
-                                                              agg::span_allocator<agg::rgba8>,
-                                                              span_gen_type>;
-
-        pixfmt_type pixf(buf);
-        pixf.comp_op(static_cast<agg::comp_op_e>(get<composite_mode_e, keys::comp_op>(sym_, feature_, common_.vars_)));
-        ren_base renb(pixf);
-
-        unsigned w = image.width();
-        unsigned h = image.height();
-        agg::rendering_buffer pattern_rbuf((agg::int8u*)image.bytes(),w,h,w*4);
-        agg::pixfmt_rgba32_pre pixf_pattern(pattern_rbuf);
-        img_source_type img_src(pixf_pattern);
-
-        pattern_alignment_enum alignment = get<pattern_alignment_enum, keys::alignment>(sym_, feature_, common_.vars_);
-        unsigned offset_x=0;
-        unsigned offset_y=0;
-
-        if (alignment == LOCAL_ALIGNMENT)
-        {
-            double x0 = 0;
-            double y0 = 0;
-            using apply_local_alignment = detail::apply_local_alignment;
-            apply_local_alignment apply(common_.t_,prj_trans_, clip_box, x0, y0);
-            util::apply_visitor(geometry::vertex_processor<apply_local_alignment>(apply), feature_.get_geometry());
-
-            offset_x = unsigned(current_buffer_.width() - x0);
-            offset_y = unsigned(current_buffer_.height() - y0);
-        }
-
-        span_gen_type sg(img_src, offset_x, offset_y);
-
-        agg::span_allocator<agg::rgba8> sa;
-        renderer_type rp(renb,sa, sg, unsigned(opacity * 255));
-
-        agg::trans_affine tr;
-        auto transform = get_optional<transform_type>(sym_, keys::geometry_transform);
-        if (transform) evaluate_transform(tr, feature_, common_.vars_, *transform, common_.scale_factor_);
         using vertex_converter_type = vertex_converter<clip_poly_tag,
                                                        transform_tag,
                                                        affine_transform_tag,
                                                        simplify_tag,
                                                        smooth_tag>;
+        using pattern_type = agg_polygon_pattern<vertex_converter_type>;
 
-        vertex_converter_type converter(clip_box, sym_,common_.t_,prj_trans_,tr,feature_,common_.vars_,common_.scale_factor_);
+        pattern_type pattern(image, common_, sym_, feature_, prj_trans_);
 
-        if (prj_trans_.equal() && clip) converter.set<clip_poly_tag>();
+        pattern_type::pixfmt_type pixf(buf);
-        converter.set<transform_tag>(); //always transform
+        pixf.comp_op(static_cast<agg::comp_op_e>(get<composite_mode_e, keys::comp_op>(sym_, feature_, common_.vars_)));
-        converter.set<affine_transform_tag>(); // optional affine transform
+        pattern_type::renderer_base renb(pixf);
-        if (simplify_tolerance > 0.0) converter.set<simplify_tag>(); // optional simplify converter
+
-        if (smooth > 0.0) converter.set<smooth_tag>(); // optional smooth converter
+        unsigned w = image.width();
+        unsigned h = image.height();
+        agg::rendering_buffer pattern_rbuf((agg::int8u*)image.bytes(),w,h,w*4);
+        agg::pixfmt_rgba32_pre pixf_pattern(pattern_rbuf);
+        pattern_type::img_source_type img_src(pixf_pattern);
+
+        if (prj_trans_.equal() && pattern.clip_) pattern.converter_.set<clip_poly_tag>();
 
-        using apply_vertex_converter_type = detail::apply_vertex_converter<vertex_converter_type, rasterizer>;
-        using vertex_processor_type = geometry::vertex_processor<apply_vertex_converter_type>;
-        apply_vertex_converter_type apply(converter, *ras_ptr_);
-        mapnik::util::apply_visitor(vertex_processor_type(apply),feature_.get_geometry());
-        agg::scanline_u8 sl;
         ras_ptr_->filling_rule(agg::fill_even_odd);
-        agg::render_scanlines(*ras_ptr_, sl, rp);
+
+        pattern.render(renb, *ras_ptr_);
     }
 
     renderer_common & common_;
@@ -220,7 +162,6 @@ void agg_renderer<T0,T1>::process(polygon_pattern_symbolizer const& sym,
                                                         feature,
                                                         prj_trans);
     util::apply_visitor(visitor, *marker);
-
 }
 
 

src/load_map.cpp

@@ -1174,6 +1174,13 @@ void map_parser::parse_line_pattern_symbolizer(rule & rule, xml_node const & nod
         set_symbolizer_property<symbolizer_base,double>(sym, keys::opacity, node);
         set_symbolizer_property<symbolizer_base,double>(sym, keys::offset, node);
         set_symbolizer_property<symbolizer_base,transform_type>(sym, keys::image_transform, node);
+        set_symbolizer_property<symbolizer_base,value_double>(sym, keys::stroke_miterlimit, node);
+        set_symbolizer_property<symbolizer_base,value_double>(sym, keys::stroke_width, node);
+        set_symbolizer_property<symbolizer_base,line_join_enum>(sym, keys::stroke_linejoin, node);
+        set_symbolizer_property<symbolizer_base,line_cap_enum>(sym, keys::stroke_linecap, node);
+        set_symbolizer_property<symbolizer_base,dash_array>(sym, keys::stroke_dasharray, node);
+        set_symbolizer_property<symbolizer_base,line_pattern_enum>(sym, keys::line_pattern, node);
+        set_symbolizer_property<symbolizer_base,pattern_alignment_enum>(sym, keys::alignment, node);
         rule.append(std::move(sym));
     }
     catch (config_error const& ex)

src/symbolizer_enumerations.cpp

@@ -207,4 +207,12 @@ static const char * gamma_method_strings[] = {
 
 IMPLEMENT_ENUM( gamma_method_e, gamma_method_strings )
 
+static const char * line_pattern_strings[] = {
+    "warp",
+    "repeat",
+    ""
+};
+
+IMPLEMENT_ENUM( line_pattern_e, line_pattern_strings )
+
 } // namespace mapnik

src/symbolizer_keys.cpp

@@ -159,6 +159,9 @@ static const property_meta_type key_meta[const_max_key] =
     property_meta_type{ "avoid-edges",nullptr, property_types::target_bool },
     property_meta_type{ "font-feature-settings", nullptr, property_types::target_font_feature_settings },
     property_meta_type{ "extend", nullptr, property_types::target_double},
+    property_meta_type{ "line-pattern",  [](enumeration_wrapper e)
+                        {return enumeration<line_pattern_enum,line_pattern_enum_MAX>(line_pattern_enum(e.value)).as_string();},
+                        property_types::target_line_pattern},
 
 };