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/*****************************************************************************
*
* This file is part of Mapnik (c++ mapping toolkit)
*
* Copyright (C) 2008 Tom Hughes
*
* 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
*
*****************************************************************************/
//$Id$
#if defined(HAVE_CAIRO)
// mapnik
#include <mapnik/cairo_renderer.hpp>
#include <mapnik/image_util.hpp>
#include <mapnik/unicode.hpp>
#include <mapnik/placement_finder.hpp>
#include <mapnik/markers_placement.hpp>
#include <mapnik/arrow.hpp>
#include <mapnik/config_error.hpp>
#include <mapnik/parse_path.hpp>
#include <mapnik/image_cache.hpp>
// cairo
#include <cairomm/context.h>
#include <cairomm/surface.h>
#include <cairo-ft.h>
// boost
#include <boost/utility.hpp>
#include <boost/tuple/tuple.hpp>
// stl
#ifdef MAPNIK_DEBUG
#include <iostream>
#endif
namespace mapnik
{
class cairo_pattern : private boost::noncopyable
{
public:
cairo_pattern(image_data_32 const& data)
{
int pixels = data.width() * data.height();
const unsigned int *in_ptr = data.getData();
const unsigned int *in_end = in_ptr + pixels;
unsigned int *out_ptr;
out_ptr = data_ = new unsigned int[pixels];
while (in_ptr < in_end)
{
unsigned int in = *in_ptr++;
unsigned int r = (in >> 0) & 0xff;
unsigned int g = (in >> 8) & 0xff;
unsigned int b = (in >> 16) & 0xff;
unsigned int a = (in >> 24) & 0xff;
r = r * a / 255;
g = g * a / 255;
b = b * a / 255;
*out_ptr++ = (a << 24) | (r << 16) | (g << 8) | b;
}
surface_ = Cairo::ImageSurface::create(reinterpret_cast<unsigned char *>(data_), Cairo::FORMAT_ARGB32, data.width(), data.height(), data.width() * 4);
pattern_ = Cairo::SurfacePattern::create(surface_);
}
~cairo_pattern(void)
{
delete [] data_;
}
void set_matrix(Cairo::Matrix const& matrix)
{
pattern_->set_matrix(matrix);
}
void set_origin(double x, double y)
{
Cairo::Matrix matrix;
pattern_->get_matrix(matrix);
matrix.x0 = -x;
matrix.y0 = -y;
pattern_->set_matrix(matrix);
}
void set_extend(Cairo::Extend extend)
{
pattern_->set_extend(extend);
}
void set_filter(Cairo::Filter filter)
{
pattern_->set_filter(filter);
}
Cairo::RefPtr<Cairo::SurfacePattern> const& pattern(void) const
{
return pattern_;
}
private:
unsigned int *data_;
Cairo::RefPtr<Cairo::ImageSurface> surface_;
Cairo::RefPtr<Cairo::SurfacePattern> pattern_;
};
class cairo_face : private boost::noncopyable
{
public:
cairo_face(boost::shared_ptr<freetype_engine> const& engine, face_ptr const& face)
: face_(face)
{
static cairo_user_data_key_t key;
cairo_font_face_t *c_face;
c_face = cairo_ft_font_face_create_for_ft_face(face->get_face(), FT_LOAD_NO_HINTING);
cairo_font_face_set_user_data(c_face, &key, new handle(engine, face), destroy);
cairo_face_ = Cairo::RefPtr<Cairo::FontFace>(new Cairo::FontFace(c_face));
}
Cairo::RefPtr<Cairo::FontFace> const& face(void) const
{
return cairo_face_;
}
private:
class handle
{
public:
handle(boost::shared_ptr<freetype_engine> const& engine, face_ptr const& face)
: engine_(engine), face_(face) {}
private:
boost::shared_ptr<freetype_engine> engine_;
face_ptr face_;
};
static void destroy(void *data)
{
handle *h = static_cast<handle *>(data);
delete h;
}
private:
face_ptr face_;
Cairo::RefPtr<Cairo::FontFace> cairo_face_;
};
cairo_face_manager::cairo_face_manager(boost::shared_ptr<freetype_engine> engine,
face_manager<freetype_engine> & manager)
: font_engine_(engine),
font_manager_(manager)
{
}
cairo_face_ptr cairo_face_manager::get_face(face_ptr face)
{
cairo_face_cache::iterator itr = cache_.find(face);
cairo_face_ptr entry;
if (itr != cache_.end())
{
entry = itr->second;
}
else
{
entry = cairo_face_ptr(new cairo_face(font_engine_, face));
cache_.insert(std::make_pair(face, entry));
}
return entry;
}
class cairo_context : private boost::noncopyable
{
public:
cairo_context(Cairo::RefPtr<Cairo::Context> const& context)
: context_(context)
{
context_->save();
}
~cairo_context(void)
{
context_->restore();
}
void set_color(color const &color, double opacity = 1.0)
{
set_color(color.red(), color.green(), color.blue(), color.alpha() * opacity / 255.0);
}
void set_color(int r, int g, int b, double opacity = 1.0)
{
context_->set_source_rgba(r / 255.0, g / 255.0, b / 255.0, opacity);
}
void set_line_join(line_join_e join)
{
if (join == MITER_JOIN)
context_->set_line_join(Cairo::LINE_JOIN_MITER);
else if (join == MITER_REVERT_JOIN)
context_->set_line_join(Cairo::LINE_JOIN_MITER);
else if (join == ROUND_JOIN)
context_->set_line_join(Cairo::LINE_JOIN_ROUND);
else
context_->set_line_join(Cairo::LINE_JOIN_BEVEL);
}
void set_line_cap(line_cap_e cap)
{
if (cap == BUTT_CAP)
context_->set_line_cap(Cairo::LINE_CAP_BUTT);
else if (cap == SQUARE_CAP)
context_->set_line_cap(Cairo::LINE_CAP_SQUARE);
else
context_->set_line_cap(Cairo::LINE_CAP_ROUND);
}
void set_miter_limit(double limit)
{
context_->set_miter_limit(limit);
}
void set_line_width(double width)
{
context_->set_line_width(width);
}
void set_dash(dash_array const &dashes)
{
std::valarray<double> d(dashes.size() * 2);
dash_array::const_iterator itr = dashes.begin();
dash_array::const_iterator end = dashes.end();
int index = 0;
for (; itr != end; ++itr)
{
d[index++] = itr->first;
d[index++] = itr->second;
}
context_->set_dash(d, 0.0);
}
void move_to(double x, double y)
{
#if CAIRO_VERSION < CAIRO_VERSION_ENCODE(1, 6, 0)
if (x < -32767.0) x = -32767.0;
else if (x > 32767.0) x = 32767.0;
if (y < -32767.0) y = -32767.0;
else if (y > 32767.0) y = 32767.0;
#endif
context_->move_to(x, y);
}
void line_to(double x, double y)
{
#if CAIRO_VERSION < CAIRO_VERSION_ENCODE(1, 6, 0)
if (x < -32767.0) x = -32767.0;
else if (x > 32767.0) x = 32767.0;
if (y < -32767.0) y = -32767.0;
else if (y > 32767.0) y = 32767.0;
#endif
context_->line_to(x, y);
}
template <typename T>
void add_path(T& path)
{
double x, y;
path.rewind(0);
for (unsigned cm = path.vertex(&x, &y); cm != SEG_END; cm = path.vertex(&x, &y))
{
if (cm == SEG_MOVETO)
{
move_to(x, y);
}
else if (cm == SEG_LINETO)
{
line_to(x, y);
}
}
}
void rectangle(double x, double y, double w, double h)
{
context_->rectangle(x, y, w, h);
}
void stroke(void)
{
context_->stroke();
}
void fill(void)
{
context_->fill();
}
void paint(void)
{
context_->paint();
}
void set_pattern(cairo_pattern const& pattern)
{
context_->set_source(pattern.pattern());
}
void add_image(double x, double y, image_data_32 & data, double opacity = 1.0)
{
cairo_pattern pattern(data);
pattern.set_origin(x, y);
context_->save();
context_->set_source(pattern.pattern());
context_->paint_with_alpha(opacity);
context_->restore();
}
void set_font_face(cairo_face_manager & manager, face_ptr face)
{
context_->set_font_face(manager.get_face(face)->face());
}
void set_font_matrix(Cairo::Matrix const& matrix)
{
context_->set_font_matrix(matrix);
}
void set_matrix(Cairo::Matrix const& matrix)
{
context_->set_matrix(matrix);
}
void show_glyph(unsigned long index, double x, double y)
{
Cairo::Glyph glyph;
glyph.index = index;
glyph.x = x;
glyph.y = y;
std::vector<Cairo::Glyph> glyphs;
glyphs.push_back(glyph);
context_->show_glyphs(glyphs);
}
void glyph_path(unsigned long index, double x, double y)
{
Cairo::Glyph glyph;
glyph.index = index;
glyph.x = x;
glyph.y = y;
std::vector<Cairo::Glyph> glyphs;
glyphs.push_back(glyph);
context_->glyph_path(glyphs);
}
void add_text(text_path & path,
cairo_face_manager & manager,
face_set_ptr const& faces,
unsigned text_size,
color const& fill,
unsigned halo_radius,
color const& halo_fill)
{
double sx = path.starting_x;
double sy = path.starting_y;
path.rewind();
for (int iii = 0; iii < path.num_nodes(); iii++)
{
int c;
double x, y, angle;
path.vertex(&c, &x, &y, &angle);
glyph_ptr glyph = faces->get_glyph(c);
if (glyph)
{
Cairo::Matrix matrix;
matrix.xx = text_size * cos(angle);
matrix.xy = text_size * sin(angle);
matrix.yx = text_size * -sin(angle);
matrix.yy = text_size * cos(angle);
matrix.x0 = 0;
matrix.y0 = 0;
set_font_matrix(matrix);
set_font_face(manager, glyph->get_face());
glyph_path(glyph->get_index(), sx + x, sy - y);
}
}
set_line_width(halo_radius);
set_line_join(ROUND_JOIN);
set_color(halo_fill);
stroke();
set_color(fill);
path.rewind();
for (int iii = 0; iii < path.num_nodes(); iii++)
{
int c;
double x, y, angle;
path.vertex(&c, &x, &y, &angle);
glyph_ptr glyph = faces->get_glyph(c);
if (glyph)
{
Cairo::Matrix matrix;
matrix.xx = text_size * cos(angle);
matrix.xy = text_size * sin(angle);
matrix.yx = text_size * -sin(angle);
matrix.yy = text_size * cos(angle);
matrix.x0 = 0;
matrix.y0 = 0;
set_font_matrix(matrix);
set_font_face(manager, glyph->get_face());
show_glyph(glyph->get_index(), sx + x, sy - y);
}
}
}
private:
Cairo::RefPtr<Cairo::Context> context_;
};
cairo_renderer_base::cairo_renderer_base(Map const& m, Cairo::RefPtr<Cairo::Context> const& context, unsigned offset_x, unsigned offset_y)
: m_(m),
context_(context),
t_(m.width(),m.height(),m.get_current_extent(),offset_x,offset_y),
font_engine_(new freetype_engine()),
font_manager_(*font_engine_),
face_manager_(font_engine_,font_manager_),
detector_(box2d<double>(-m.buffer_size() ,-m.buffer_size() , m.width() + m.buffer_size() ,m.height() + m.buffer_size()))
{
#ifdef MAPNIK_DEBUG
std::clog << "scale=" << m.scale() << "\n";
#endif
}
template <>
cairo_renderer<Cairo::Context>::cairo_renderer(Map const& m, Cairo::RefPtr<Cairo::Context> const& context, unsigned offset_x, unsigned offset_y)
: feature_style_processor<cairo_renderer>(m),
cairo_renderer_base(m,context,offset_x,offset_y)
{
}
template <>
cairo_renderer<Cairo::Surface>::cairo_renderer(Map const& m, Cairo::RefPtr<Cairo::Surface> const& surface, unsigned offset_x, unsigned offset_y)
: feature_style_processor<cairo_renderer>(m),
cairo_renderer_base(m,Cairo::Context::create(surface),offset_x,offset_y)
{
}
cairo_renderer_base::~cairo_renderer_base() {}
void cairo_renderer_base::start_map_processing(Map const& map)
{
#ifdef MAPNIK_DEBUG
std::clog << "start map processing bbox="
<< map.get_current_extent() << "\n";
#endif
#if CAIRO_VERSION >= CAIRO_VERSION_ENCODE(1, 6, 0)
box2d<double> bounds = t_.forward(t_.extent());
context_->rectangle(bounds.minx(), bounds.miny(), bounds.maxx(), bounds.maxy());
context_->clip();
#endif
boost::optional<color> bg = m_.background();
if (bg)
{
cairo_context context(context_);
context.set_color(*bg);
context.paint();
}
}
template <>
void cairo_renderer<Cairo::Context>::end_map_processing(Map const& )
{
#ifdef MAPNIK_DEBUG
std::clog << "end map processing\n";
#endif
}
template <>
void cairo_renderer<Cairo::Surface>::end_map_processing(Map const& )
{
#ifdef MAPNIK_DEBUG
std::clog << "end map processing\n";
#endif
context_->show_page();
}
void cairo_renderer_base::start_layer_processing(layer const& lay)
{
#ifdef MAPNIK_DEBUG
std::clog << "start layer processing : " << lay.name() << "\n";
std::clog << "datasource = " << lay.datasource().get() << "\n";
#endif
if (lay.clear_label_cache())
{
detector_.clear();
}
}
void cairo_renderer_base::end_layer_processing(layer const&)
{
#ifdef MAPNIK_DEBUG
std::clog << "end layer processing\n";
#endif
}
void cairo_renderer_base::process(polygon_symbolizer const& sym,
Feature const& feature,
proj_transform const& prj_trans)
{
typedef coord_transform2<CoordTransform,geometry2d> path_type;
cairo_context context(context_);
context.set_color(sym.get_fill(), sym.get_opacity());
for (unsigned i = 0; i < feature.num_geometries(); ++i)
{
geometry2d const& geom = feature.get_geometry(i);
if (geom.num_points() > 2)
{
path_type path(t_, geom, prj_trans);
context.add_path(path);
context.fill();
}
}
}
typedef boost::tuple<double,double,double,double> segment_t;
bool cairo_y_order(segment_t const& first,segment_t const& second)
{
double miny0 = std::min(first.get<1>(), first.get<3>());
double miny1 = std::min(second.get<1>(), second.get<3>());
return miny0 > miny1;
}
void cairo_renderer_base::process(building_symbolizer const& sym,
Feature const& feature,
proj_transform const& prj_trans)
{
typedef coord_transform2<CoordTransform,geometry2d> path_type;
typedef coord_transform3<CoordTransform,geometry2d> path_type_roof;
cairo_context context(context_);
color const& fill = sym.get_fill();
double height = 0.7071 * sym.height(); // height in meters
for (unsigned i = 0; i < feature.num_geometries(); ++i)
{
geometry2d const& geom = feature.get_geometry(i);
if (geom.num_points() > 2)
{
boost::scoped_ptr<geometry2d> frame(new line_string_impl);
boost::scoped_ptr<geometry2d> roof(new polygon_impl);
std::deque<segment_t> face_segments;
double x0(0);
double y0(0);
unsigned cm = geom.vertex(&x0, &y0);
for (unsigned j = 1; j < geom.num_points(); ++j)
{
double x,y;
cm = geom.vertex(&x,&y);
if (cm == SEG_MOVETO)
{
frame->move_to(x,y);
}
else if (cm == SEG_LINETO)
{
frame->line_to(x,y);
}
if (j != 0)
{
face_segments.push_back(segment_t(x0, y0, x, y));
}
x0 = x;
y0 = y;
}
std::sort(face_segments.begin(), face_segments.end(), cairo_y_order);
std::deque<segment_t>::const_iterator itr = face_segments.begin();
for (; itr != face_segments.end(); ++itr)
{
boost::scoped_ptr<geometry2d> faces(new polygon_impl);
faces->move_to(itr->get<0>(), itr->get<1>());
faces->line_to(itr->get<2>(), itr->get<3>());
faces->line_to(itr->get<2>(), itr->get<3>() + height);
faces->line_to(itr->get<0>(), itr->get<1>() + height);
path_type faces_path(t_, *faces, prj_trans);
context.set_color(int(fill.red() * 0.8), int(fill.green() * 0.8),
int(fill.blue() * 0.8), fill.alpha() * sym.get_opacity() / 255.0);
context.add_path(faces_path);
context.fill();
frame->move_to(itr->get<0>(), itr->get<1>());
frame->line_to(itr->get<0>(), itr->get<1>() + height);
}
geom.rewind(0);
for (unsigned j = 0; j < geom.num_points(); ++j)
{
double x, y;
unsigned cm = geom.vertex(&x, &y);
if (cm == SEG_MOVETO)
{
frame->move_to(x, y + height);
roof->move_to(x, y + height);
}
else if (cm == SEG_LINETO)
{
frame->line_to(x, y + height);
roof->line_to(x, y + height);
}
}
path_type path(t_, *frame, prj_trans);
context.set_color(128, 128, 128, sym.get_opacity());
context.add_path(path);
context.stroke();
path_type roof_path(t_, *roof, prj_trans);
context.set_color(sym.get_fill(), sym.get_opacity());
context.add_path(roof_path);
context.fill();
}
}
}
void cairo_renderer_base::process(line_symbolizer const& sym,
Feature const& feature,
proj_transform const& prj_trans)
{
typedef coord_transform2<CoordTransform,geometry2d> path_type;
cairo_context context(context_);
mapnik::stroke const& stroke_ = sym.get_stroke();
context.set_color(stroke_.get_color(), stroke_.get_opacity());
for (unsigned i = 0; i < feature.num_geometries(); ++i)
{
geometry2d const& geom = feature.get_geometry(i);
if (geom.num_points() > 1)
{
cairo_context context(context_);
path_type path(t_, geom, prj_trans);
if (stroke_.has_dash())
{
context.set_dash(stroke_.get_dash_array());
}
context.set_line_join(stroke_.get_line_join());
context.set_line_cap(stroke_.get_line_cap());
context.set_miter_limit(4.0);
context.set_line_width(stroke_.get_width());
context.add_path(path);
context.stroke();
}
}
}
void cairo_renderer_base::process(point_symbolizer const& sym,
Feature const& feature,
proj_transform const& prj_trans)
{
std::string filename = path_processor_type::evaluate( *sym.get_filename(), feature);
boost::optional<mapnik::image_ptr> data;
if ( filename.empty() )
{
// default OGC 4x4 black pixel
data = boost::optional<mapnik::image_ptr>(new image_data_32(4,4));
(*data)->set(0xff000000);
}
else
{
data = mapnik::image_cache::instance()->find(filename,true);
}
if (data)
{
for (unsigned i = 0; i < feature.num_geometries(); ++i)
{
geometry2d const& geom = feature.get_geometry(i);
double x;
double y;
double z = 0;
geom.label_position(&x, &y);
prj_trans.backward(x, y, z);
t_.forward(&x, &y);
int w = (*data)->width();
int h = (*data)->height();
int px = int(floor(x - 0.5 * w));
int py = int(floor(y - 0.5 * h));
box2d<double> label_ext (px, py, px + w, py + h);
if (sym.get_allow_overlap() ||
detector_.has_placement(label_ext))
{
cairo_context context(context_);
context.add_image(px, py, *(*data), sym.get_opacity());
detector_.insert(label_ext);
metawriter_with_properties writer = sym.get_metawriter();
if (writer.first)
{
writer.first->add_box(label_ext, feature, t_, writer.second);
}
}
}
}
}
void cairo_renderer_base::process(shield_symbolizer const& sym,
Feature const& feature,
proj_transform const& prj_trans)
{
typedef coord_transform2<CoordTransform,geometry2d> path_type;
expression_ptr name_expr = sym.get_name();
if (!name_expr) return;
value_type result = boost::apply_visitor(evaluate<Feature,value_type>(feature),*name_expr);
UnicodeString text = result.to_unicode();
std::string filename = path_processor_type::evaluate( *sym.get_filename(), feature);
boost::optional<mapnik::image_ptr> data = mapnik::image_cache::instance()->find(filename,true);
if (text.length() > 0 && data)
{
face_set_ptr faces;
if (sym.get_fontset().size() > 0)
{
faces = font_manager_.get_face_set(sym.get_fontset());
}
else
{
faces = font_manager_.get_face_set(sym.get_face_name());
}
if (faces->size() > 0)
{
cairo_context context(context_);
string_info info(text);
faces->set_pixel_sizes(sym.get_text_size());
faces->get_string_info(info);
placement_finder<label_collision_detector4> finder(detector_);
int w = (*data)->width();
int h = (*data)->height();
metawriter_with_properties writer = sym.get_metawriter();
for (unsigned i = 0; i < feature.num_geometries(); ++i)
{
geometry2d const& geom = feature.get_geometry(i);
if (geom.num_points() > 0) // don't bother with empty geometries
{
path_type path(t_, geom, prj_trans);
if (sym.get_label_placement() == POINT_PLACEMENT)
{
double label_x;
double label_y;
double z = 0.0;
placement text_placement(info, sym, w, h, false);
text_placement.avoid_edges = sym.get_avoid_edges();
geom.label_position(&label_x, &label_y);
prj_trans.backward(label_x, label_y, z);
t_.forward(&label_x, &label_y);
finder.find_point_placement(text_placement, label_x, label_y);
for (unsigned int ii = 0; ii < text_placement.placements.size(); ++ ii)
{
double x = text_placement.placements[ii].starting_x;
double y = text_placement.placements[ii].starting_y;
// remove displacement from image label
position pos = sym.get_displacement();
double lx = x - boost::get<0>(pos);
double ly = y - boost::get<1>(pos);
int px = int(lx - (0.5 * w)) ;
int py = int(ly - (0.5 * h)) ;
box2d<double> label_ext (floor(lx - 0.5 * w), floor(ly - 0.5 * h), ceil (lx + 0.5 * w), ceil (ly + 0.5 * h));
if (detector_.has_placement(label_ext))
{
context.add_image(px, py, *(*data));
context.add_text(text_placement.placements[ii],
face_manager_,
faces,
sym.get_text_size(),
sym.get_fill(),
sym.get_halo_radius(),
sym.get_halo_fill()
);
if (writer.first) {
writer.first->add_box(box2d<double>(px,py,px+w,py+h), feature, t_, writer.second);
writer.first->add_text(text_placement, faces, feature, t_, writer.second); //Only 1 placement
}
detector_.insert(label_ext);
}
}
finder.update_detector(text_placement);
}
else if (geom.num_points() > 1 && sym.get_label_placement() == LINE_PLACEMENT)
{
placement text_placement(info, sym, w, h, true);
text_placement.avoid_edges = sym.get_avoid_edges();
finder.find_point_placements<path_type>(text_placement, path);
for (unsigned int ii = 0; ii < text_placement.placements.size(); ++ ii)
{
double x = text_placement.placements[ii].starting_x;
double y = text_placement.placements[ii].starting_y;
int px = int(x - (w/2));
int py = int(y - (h/2));
context.add_image(px, py, *(*data));
context.add_text(text_placement.placements[ii],
face_manager_,
faces,
sym.get_text_size(),
sym.get_fill(),
sym.get_halo_radius(),
sym.get_halo_fill()
);
if (writer.first) writer.first->add_box(box2d<double>(px,py,px+w,py+h), feature, t_, writer.second);
}
finder.update_detector(text_placement);
if (writer.first) writer.first->add_text(text_placement, faces, feature, t_, writer.second); //More than one placement
}
}
}
}
}
}
void cairo_renderer_base::process(line_pattern_symbolizer const& sym,
Feature const& feature,
proj_transform const& prj_trans)
{
typedef coord_transform2<CoordTransform,geometry2d> path_type;
std::string filename = path_processor_type::evaluate( *sym.get_filename(), feature);
boost::optional<mapnik::image_ptr> image = mapnik::image_cache::instance()->find(filename,true);
if (!image) return;
unsigned width((*image)->width());
unsigned height((*image)->height());
cairo_context context(context_);
cairo_pattern pattern(*(*image));
pattern.set_extend(Cairo::EXTEND_REPEAT);
pattern.set_filter(Cairo::FILTER_BILINEAR);
context.set_line_width(height);
for (unsigned i = 0; i < feature.num_geometries(); ++i)
{
geometry2d const& geom = feature.get_geometry(i);
if (geom.num_points() > 1)
{
path_type path(t_, geom, prj_trans);
double length(0);
double x0(0), y0(0);
double x, y;
for (unsigned cm = path.vertex(&x, &y); cm != SEG_END; cm = path.vertex(&x, &y))
{
if (cm == SEG_MOVETO)
{
length = 0.0;
}
else if (cm == SEG_LINETO)
{
double dx = x - x0;
double dy = y - y0;
double angle = atan2(dy, dx);
double offset = fmod(length, width);
Cairo::Matrix matrix;
cairo_matrix_init_identity(&matrix);
cairo_matrix_translate(&matrix,x0,y0);
cairo_matrix_rotate(&matrix,angle);
cairo_matrix_translate(&matrix,-offset,0.5*height);
cairo_matrix_invert(&matrix);
pattern.set_matrix(matrix);
context.set_pattern(pattern);
context.move_to(x0, y0);
context.line_to(x, y);
context.stroke();
length = length + hypot(x - x0, y - y0);
}
x0 = x;
y0 = y;
}
}
}
}
void cairo_renderer_base::process(polygon_pattern_symbolizer const& sym,
Feature const& feature,
proj_transform const& prj_trans)
{
typedef coord_transform2<CoordTransform,geometry2d> path_type;
cairo_context context(context_);
std::string filename = path_processor_type::evaluate( *sym.get_filename(), feature);
boost::optional<mapnik::image_ptr> image = mapnik::image_cache::instance()->find(filename,true);
if (!image) return;
cairo_pattern pattern(*(*image));
pattern.set_extend(Cairo::EXTEND_REPEAT);
context.set_pattern(pattern);
for (unsigned i = 0; i < feature.num_geometries(); ++i)
{
geometry2d const& geom = feature.get_geometry(i);
if (geom.num_points() > 2)
{
path_type path(t_, geom, prj_trans);
context.add_path(path);
context.fill();
}
}
}
void cairo_renderer_base::process(raster_symbolizer const& sym,
Feature const& feature,
proj_transform const& prj_trans)
{
// TODO -- at the moment raster_symbolizer is an empty class
// used for type dispatching, but we can have some fancy raster
// processing in a future (filters??). Just copy raster into pixmap for now.
raster_ptr const& raster = feature.get_raster();
if (raster)
{
// If there's a colorizer defined, use it to color the raster in-place
raster_colorizer_ptr colorizer = sym.get_colorizer();
if (colorizer)
colorizer->colorize(raster);
box2d<double> ext = t_.forward(raster->ext_);
int start_x = int(round(ext.minx()));
int start_y = int(round(ext.miny()));
int raster_width = int(round(ext.width()));
int raster_height = int(round(ext.height()));
int end_x = start_x + raster_width;
int end_y = start_y + raster_height;
double err_offs_x = (ext.minx()-start_x + ext.maxx()-end_x)/2;
double err_offs_y = (ext.miny()-start_y + ext.maxy()-end_y)/2;
if (raster_width > 0 && raster_height > 0)
{
image_data_32 target(raster_width, raster_height);
//TODO -- use cairo matrix transformation for scaling
if (sym.get_scaling() == "fast"){
scale_image<image_data_32>(target, raster->data_);
} else if (sym.get_scaling() == "bilinear"){
scale_image_bilinear<image_data_32>(target,raster->data_, err_offs_x, err_offs_y);
} else if (sym.get_scaling() == "bilinear8"){
scale_image_bilinear8<image_data_32>(target,raster->data_, err_offs_x, err_offs_y);
} else {
scale_image<image_data_32>(target,raster->data_);
}
cairo_context context(context_);
//TODO -- support for advanced image merging
context.add_image(start_x, start_y, target, sym.get_opacity());
}
}
}
void cairo_renderer_base::process(markers_symbolizer const& sym,
Feature const& feature,
proj_transform const& prj_trans)
{
typedef coord_transform2<CoordTransform,geometry2d> path_type;
arrow arrow_;
cairo_context context(context_);
color const& fill_ = sym.get_fill();
context.set_color(fill_.red(), fill_.green(), fill_.blue(), fill_.alpha());
for (unsigned i = 0; i < feature.num_geometries(); ++i)
{
geometry2d const& geom = feature.get_geometry(i);
if (geom.num_points() > 1)
{
path_type path(t_, geom, prj_trans);
markers_placement<path_type, label_collision_detector4> placement(path, arrow_.extent(), detector_, sym.get_spacing(), sym.get_max_error(), sym.get_allow_overlap());
double x, y, angle;
while (placement.get_point(&x, &y, &angle)) {
Cairo::Matrix matrix = Cairo::rotation_matrix(angle) * Cairo::translation_matrix(x,y) ;
context.set_matrix(matrix);
context.add_path(arrow_);
}
}
context.fill();
}
}
void cairo_renderer_base::process(glyph_symbolizer const& sym,
Feature const& feature,
proj_transform const& prj_trans)
{
face_set_ptr faces = font_manager_.get_face_set(sym.get_face_name());
if (faces->size() > 0)
{
// Get x and y from geometry and translate to pixmap coords.
double x, y, z=0.0;
feature.get_geometry(0).label_position(&x, &y);
prj_trans.backward(x,y,z);
t_.forward(&x, &y);
// set font size
unsigned size = sym.eval_size(feature);
faces->set_pixel_sizes(size);
// Get and render text path
//
text_path_ptr path = sym.get_text_path(faces, feature);
// apply displacement
position pos = sym.get_displacement();
double dx = boost::get<0>(pos);
double dy = boost::get<1>(pos);
path->starting_x = x = x+dx;
path->starting_y = y = y+dy;
// get fill and halo params
color fill = sym.eval_color(feature);
color halo_fill = sym.get_halo_fill();
double halo_radius = sym.get_halo_radius();
if (fill==color("transparent"))
halo_radius = 0;
double bsize = size/2 + 1;
box2d<double> glyph_ext(
floor(x-bsize), floor(y-bsize), ceil(x+bsize), ceil(y+bsize)
);
if ((sym.get_allow_overlap() || detector_.has_placement(glyph_ext)) &&
(!sym.get_avoid_edges() || detector_.extent().contains(glyph_ext)))
{
// Placement is valid, render glyph and update detector.
cairo_context context(context_);
context.add_text(*path,
face_manager_,
faces,
size,
fill,
halo_radius,
halo_fill
);
detector_.insert(glyph_ext);
metawriter_with_properties writer = sym.get_metawriter();
if (writer.first) writer.first->add_box(glyph_ext, feature, t_, writer.second);
}
}
else
{
throw config_error(
"Unable to find specified font face in GlyphSymbolizer"
);
}
}
void cairo_renderer_base::process(text_symbolizer const& sym,
Feature const& feature,
proj_transform const& prj_trans)
{
typedef coord_transform2<CoordTransform,geometry2d> path_type;
expression_ptr name_expr = sym.get_name();
if (!name_expr) return;
value_type result = boost::apply_visitor(evaluate<Feature,value_type>(feature),*name_expr);
UnicodeString text = result.to_unicode();
if ( sym.get_text_transform() == UPPERCASE)
{
text = text.toUpper();
}
else if ( sym.get_text_transform() == LOWERCASE)
{
text = text.toLower();
}
if (text.length() > 0)
{
face_set_ptr faces;
if (sym.get_fontset().size() > 0)
{
faces = font_manager_.get_face_set(sym.get_fontset());
}
else
{
faces = font_manager_.get_face_set(sym.get_face_name());
}
if (faces->size() > 0)
{
cairo_context context(context_);
string_info info(text);
faces->set_pixel_sizes(sym.get_text_size());
faces->get_string_info(info);
placement_finder<label_collision_detector4> finder(detector_);
for (unsigned i = 0; i < feature.num_geometries(); ++i)
{
geometry2d const& geom = feature.get_geometry(i);
if (geom.num_points() > 0) // don't bother with empty geometries
{
path_type path(t_, geom, prj_trans);
placement text_placement(info, sym);
if (sym.get_label_placement() == POINT_PLACEMENT)
{
double label_x, label_y, z = 0.0;
geom.label_position(&label_x, &label_y);
prj_trans.backward(label_x, label_y, z);
t_.forward(&label_x, &label_y);
finder.find_point_placement(text_placement, label_x, label_y);
finder.update_detector(text_placement);
}
else //LINE_PLACEMENT
{
finder.find_line_placements<path_type>(text_placement, path);
}
for (unsigned int ii = 0; ii < text_placement.placements.size(); ++ii)
{
context.add_text(text_placement.placements[ii],
face_manager_,
faces,
sym.get_text_size(),
sym.get_fill(),
sym.get_halo_radius(),
sym.get_halo_fill()
);
}
metawriter_with_properties writer = sym.get_metawriter();
if (writer.first) writer.first->add_text(text_placement, faces, feature, t_, writer.second);
}
}
}
else
{
throw config_error("Unable to find specified font face '" + sym.get_face_name() + "'");
}
}
}
template class cairo_renderer<Cairo::Surface>;
template class cairo_renderer<Cairo::Context>;
}
#endif