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mapnik/include/mapnik/cairo_context.hpp

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/*****************************************************************************
*
* This file is part of Mapnik (c++ mapping toolkit)
*
* Copyright (C) 2013 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_CAIRO_CONTEXT_HPP
#define MAPNIK_CAIRO_CONTEXT_HPP
// mapnik
#include <mapnik/debug.hpp>
#include <mapnik/box2d.hpp>
#include <mapnik/color.hpp>
#include <mapnik/stroke.hpp>
#include <mapnik/image_data.hpp>
#include <mapnik/image_compositing.hpp>
#include <mapnik/font_engine_freetype.hpp>
#include <mapnik/gradient.hpp>
#include <mapnik/vertex.hpp>
#include <mapnik/noncopyable.hpp>
// boost
#include <memory>
// cairo
#include <cairo.h>
// stl
#include <map>
#include <vector>
#include <stdexcept>
// agg
#include "agg_basics.h"
namespace mapnik {
class text_path;
typedef cairo_status_t ErrorStatus;
/// Throws the appropriate exception, if exceptions are enabled.
inline void throw_exception(ErrorStatus status)
{
throw std::runtime_error(std::string("cairo: ") + cairo_status_to_string(status));
}
//We inline this because it is called so often.
inline void check_status_and_throw_exception(ErrorStatus status)
{
if(status != CAIRO_STATUS_SUCCESS)
throw_exception(status);
}
template<class T>
void check_object_status_and_throw_exception(T const& object)
{
check_status_and_throw_exception(object.get_status());
}
class cairo_face : private mapnik::noncopyable
{
public:
cairo_face(std::shared_ptr<freetype_engine> const& engine, face_ptr const& face);
~cairo_face();
cairo_font_face_t * face() const;
private:
class handle
{
public:
handle(std::shared_ptr<freetype_engine> const& engine, face_ptr const& face)
: engine_(engine), face_(face) {}
private:
std::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_font_face_t *c_face_;
};
typedef std::shared_ptr<cairo_face> cairo_face_ptr;
class cairo_face_manager : private mapnik::noncopyable
{
public:
cairo_face_manager(std::shared_ptr<freetype_engine> engine);
cairo_face_ptr get_face(face_ptr face);
private:
typedef std::map<face_ptr,cairo_face_ptr> cairo_face_cache;
std::shared_ptr<freetype_engine> font_engine_;
cairo_face_cache cache_;
};
class cairo_pattern : private mapnik::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;
surface_ = cairo_image_surface_create(CAIRO_FORMAT_ARGB32, data.width(), data.height());
out_ptr = reinterpret_cast<unsigned int *>(cairo_image_surface_get_data(surface_));
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;
}
// mark the surface as dirty as we've modified it behind cairo's back
cairo_surface_mark_dirty(surface_);
pattern_ = cairo_pattern_create_for_surface(surface_);
}
~cairo_pattern()
{
if (surface_) cairo_surface_destroy(surface_);
if (pattern_) cairo_pattern_destroy(pattern_);
}
void set_matrix(cairo_matrix_t const& matrix)
{
cairo_pattern_set_matrix(pattern_, &matrix);
}
void set_origin(double x, double y)
{
cairo_matrix_t matrix;
cairo_pattern_get_matrix(pattern_,&matrix);
matrix.x0 = -x;
matrix.y0 = -y;
cairo_pattern_set_matrix(pattern_,&matrix);
}
void set_extend(cairo_extend_t extend)
{
cairo_pattern_set_extend(pattern_, extend);
}
void set_filter(cairo_filter_t filter)
{
cairo_pattern_set_filter(pattern_, filter);
}
cairo_pattern_t * pattern() const
{
return pattern_;
}
private:
cairo_surface_t * surface_;
cairo_pattern_t * pattern_;
};
class cairo_gradient : private mapnik::noncopyable
{
public:
cairo_gradient(const mapnik::gradient &grad, double opacity=1.0)
{
double x1,x2,y1,y2,rad;
grad.get_control_points(x1,y1,x2,y2,rad);
if (grad.get_gradient_type() == LINEAR)
{
pattern_ = cairo_pattern_create_linear(x1, y1, x2, y2);
}
else if (grad.get_gradient_type() == RADIAL)
{
pattern_ = cairo_pattern_create_radial(x1, y1, 0, x2, y2, rad);
}
units_ = grad.get_units();
for ( mapnik::stop_pair const& st : grad.get_stop_array() )
{
mapnik::color const& stop_color = st.second;
double r= static_cast<double> (stop_color.red())/255.0;
double g= static_cast<double> (stop_color.green())/255.0;
double b= static_cast<double> (stop_color.blue())/255.0;
double a= static_cast<double> (stop_color.alpha())/255.0;
cairo_pattern_add_color_stop_rgba(pattern_,st.first, r, g, b, a*opacity);
}
double m[6];
agg::trans_affine tr = grad.get_transform();
tr.invert();
tr.store_to(m);
cairo_matrix_t matrix;
cairo_matrix_init(&matrix,m[0],m[1],m[2],m[3],m[4],m[5]);
cairo_pattern_set_matrix(pattern_, &matrix);
}
~cairo_gradient()
{
if (pattern_)
cairo_pattern_destroy(pattern_);
}
cairo_pattern_t * gradient() const
{
return pattern_;
}
gradient_unit_e units() const
{
return units_;
}
private:
cairo_pattern_t * pattern_;
gradient_unit_e units_;
};
struct cairo_closer
{
void operator() (cairo_t * obj)
{
if (obj) cairo_destroy(obj);
}
};
struct cairo_surface_closer
{
void operator() (cairo_surface_t * surface)
{
if (surface) cairo_surface_destroy(surface);
}
};
typedef std::shared_ptr<cairo_t> cairo_ptr;
typedef std::shared_ptr<cairo_surface_t> cairo_surface_ptr;
inline cairo_ptr create_context(cairo_surface_ptr const& surface)
{
return cairo_ptr(cairo_create(&*surface),cairo_closer());
}
class cairo_context : private mapnik::noncopyable
{
public:
cairo_context(cairo_ptr const& cairo);
inline ErrorStatus get_status() const
{
return cairo_status(cairo_.get());
}
void clip();
void show_page();
void set_color(color const &color, double opacity = 1.0);
void set_color(double r, double g, double b, double opacity = 1.0);
void set_operator(composite_mode_e comp_op);
void set_line_join(line_join_e join);
void set_line_cap(line_cap_e cap);
void set_miter_limit(double limit);
void set_line_width(double width);
void set_dash(dash_array const &dashes, double scale_factor);
void set_fill_rule(cairo_fill_rule_t fill_rule);
void move_to(double x, double y);
void curve_to(double ct1_x, double ct1_y, double ct2_x, double ct2_y, double end_x, double end_y);
void close_path();
void line_to(double x, double y);
void rectangle(double x, double y, double w, double h);
void stroke();
void fill();
void paint();
void set_pattern(cairo_pattern const& pattern);
void set_gradient(cairo_gradient const& pattern, box2d<double> const& bbox);
void add_image(double x, double y, image_data_32 & data, double opacity = 1.0);
void add_image(agg::trans_affine const& tr, image_data_32 & data, double opacity = 1.0);
void set_font_face(cairo_face_manager & manager, face_ptr face);
void set_font_matrix(cairo_matrix_t const& matrix);
void set_matrix(cairo_matrix_t const& matrix);
void transform(cairo_matrix_t const& matrix);
void translate(double x, double y);
void save();
void restore();
void show_glyph(unsigned long index, double x, double y);
void glyph_path(unsigned long index, double x, double y);
void add_text(text_path const& path,
cairo_face_manager & manager,
face_manager<freetype_engine> & font_manager,
double scale_factor = 1.0);
template <typename T>
void add_path(T& path, unsigned start_index = 0)
{
double x, y;
path.rewind(start_index);
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);
}
else if (cm == SEG_CLOSE)
{
close_path();
}
}
}
template <typename T>
void add_agg_path(T& path, unsigned start_index = 0)
{
double x=0;
double y=0;
path.rewind(start_index);
for (unsigned cm = path.vertex(&x, &y); !agg::is_stop(cm); cm = path.vertex(&x, &y))
{
if (agg::is_move_to(cm))
{
move_to(x, y);
}
else if (agg::is_drawing(cm))
{
if (agg::is_curve3(cm))
{
double end_x=0;
double end_y=0;
MAPNIK_LOG_WARN(cairo_renderer) << "Curve 3 not implemented";
path.vertex(&end_x, &end_y);
curve_to(x,y,x,y,end_x,end_y);
}
else if (agg::is_curve4(cm))
{
double ct2_x=0;
double ct2_y=0;
double end_x=0;
double end_y=0;
path.vertex(&ct2_x, &ct2_y);
path.vertex(&end_x, &end_y);
curve_to(x,y,ct2_x,ct2_y,end_x,end_y);
}
else if (agg::is_line_to(cm))
{
line_to(x, y);
}
else
{
MAPNIK_LOG_WARN(cairo_renderer) << "Unimplemented drawing command: " << cm;
move_to(x, y);
}
}
else if (agg::is_close(cm))
{
close_path();
}
else
{
MAPNIK_LOG_WARN(cairo_renderer) << "Unimplemented path command: " << cm;
}
}
}
private:
cairo_ptr cairo_;
};
}
#endif // MAPNIK_CAIRO_CONTEXT_HPP
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