218 lines
6.8 KiB
C++
218 lines
6.8 KiB
C++
/*****************************************************************************
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*
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* This file is part of Mapnik (c++ mapping toolkit)
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*
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* Copyright (C) 2006 Artem Pavlenko, Jean-Francois Doyon
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*
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* This library is free software; you can redistribute it and/or
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* modify it under the terms of the GNU Lesser General Public
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* License as published by the Free Software Foundation; either
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* version 2.1 of the License, or (at your option) any later version.
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*
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* This library is distributed in the hope that it will be useful,
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* but WITHOUT ANY WARRANTY; without even the implied warranty of
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* MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the GNU
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* Lesser General Public License for more details.
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*
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* You should have received a copy of the GNU Lesser General Public
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* License along with this library; if not, write to the Free Software
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* Foundation, Inc., 51 Franklin St, Fifth Floor, Boston, MA 02110-1301 USA
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*
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*****************************************************************************/
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//$Id$
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extern "C"
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{
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#include <png.h>
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}
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// boost
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#include <boost/python.hpp>
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#include <boost/python/module.hpp>
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#include <boost/python/def.hpp>
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// mapnik
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#include <mapnik/graphics.hpp>
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#include <mapnik/image_util.hpp>
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#include <mapnik/png_io.hpp>
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#include <mapnik/image_reader.hpp>
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#include <sstream>
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// agg
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#include "agg_rendering_buffer.h"
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#include "agg_rasterizer_scanline_aa.h"
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#include "agg_scanline_u.h"
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#include "agg_renderer_scanline.h"
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#include "agg_pixfmt_rgba.h"
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// jpeg
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#if defined(HAVE_JPEG)
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#include <mapnik/jpeg_io.hpp>
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#endif
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// cairo
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#if defined(HAVE_CAIRO) && defined(HAVE_PYCAIRO)
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#include <cairomm/surface.h>
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#include <pycairo.h>
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#endif
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using mapnik::image_32;
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using mapnik::image_reader;
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using mapnik::get_image_reader;
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using mapnik::type_from_filename;
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using namespace boost::python;
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using mapnik::save_to_file;
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// output 'raw' pixels
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PyObject* tostring1( image_32 const& im)
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{
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int size = im.width() * im.height() * 4;
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return
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#if PY_VERSION_HEX >= 0x03000000
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::PyBytes_FromStringAndSize
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#else
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::PyString_FromStringAndSize
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#endif
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((const char*)im.raw_data(),size);
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}
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// encode (png,jpeg)
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PyObject* tostring2(image_32 const & im, std::string const& format)
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{
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std::string s = save_to_string(im, format);
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return
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#if PY_VERSION_HEX >= 0x03000000
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::PyBytes_FromStringAndSize
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#else
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::PyString_FromStringAndSize
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#endif
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(s.data(),s.size());
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}
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void (*save_to_file1)( mapnik::image_32 const&, std::string const&,std::string const&) = mapnik::save_to_file;
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void (*save_to_file2)( mapnik::image_32 const&, std::string const&) = mapnik::save_to_file;
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boost::shared_ptr<image_32> open_from_file(std::string const& filename)
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{
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boost::optional<std::string> type = type_from_filename(filename);
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if (type)
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{
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std::auto_ptr<image_reader> reader(get_image_reader(filename,*type));
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if (reader.get())
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{
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boost::shared_ptr<image_32> image_ptr(new image_32(reader->width(),reader->height()));
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reader->read(0,0,image_ptr->data());
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return image_ptr;
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}
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throw mapnik::image_reader_exception("Failed to load: " + filename);
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}
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throw mapnik::image_reader_exception("Unsupported image format:" + filename);
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}
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void blend (image_32 & im, unsigned x, unsigned y, image_32 const& im2, float opacity)
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{
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im.set_rectangle_alpha2(im2.data(),x,y,opacity);
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}
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enum composite_mode_e
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{
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clear = 1,
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src,
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dst,
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src_over,
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dst_over,
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src_in,
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dst_in,
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src_out,
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dst_out,
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multiply
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};
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void composite(image_32 & im, image_32 & im2, composite_mode_e mode)
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{
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typedef agg::rgba8 color;
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typedef agg::order_bgra order;
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typedef agg::pixel32_type pixel_type;
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typedef agg::comp_op_adaptor_rgba<color, order> blender_type;
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typedef agg::pixfmt_custom_blend_rgba<blender_type, agg::rendering_buffer> pixfmt_type;
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typedef agg::renderer_base<pixfmt_type> renderer_type;
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typedef agg::comp_op_adaptor_rgba<color, order> blender_type;
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typedef agg::renderer_base<pixfmt_type> renderer_type;
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agg::rendering_buffer source(im.raw_data(),im.width(),im.height(),im.width() * 4);
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agg::rendering_buffer mask(im2.raw_data(),im2.width(),im2.height(),im2.width() * 4);
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agg::pixfmt_custom_blend_rgba<blender_type, agg::rendering_buffer> pixf(source);
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agg::pixfmt_custom_blend_rgba<blender_type, agg::rendering_buffer> pixf_mask(mask);
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switch(mode)
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{
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case src_in:
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pixf.comp_op(agg::comp_op_src_in);
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break;
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case dst_in:
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pixf.comp_op(agg::comp_op_dst_in);
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break;
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case src_out:
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pixf.comp_op(agg::comp_op_src_out);
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break;
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case dst_out:
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pixf.comp_op(agg::comp_op_dst_out);
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break;
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case multiply:
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pixf.comp_op(agg::comp_op_multiply);
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break;
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default:
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break;
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}
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renderer_type ren(pixf);
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agg::renderer_base<pixfmt_type> rb(pixf);
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rb.blend_from(pixf_mask,0,0,0,255);
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}
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#if defined(HAVE_CAIRO) && defined(HAVE_PYCAIRO)
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boost::shared_ptr<image_32> from_cairo(PycairoSurface* surface)
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{
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Cairo::RefPtr<Cairo::ImageSurface> s(new Cairo::ImageSurface(surface->surface));
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boost::shared_ptr<image_32> image_ptr(new image_32(s));
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return image_ptr;
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}
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#endif
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void export_image()
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{
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using namespace boost::python;
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enum_<composite_mode_e>("CompositeOp")
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.value("src_in",src_in)
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.value("dst_in",dst_in)
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.value("src_out",src_out)
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.value("dst_out",dst_out)
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.value("multiply",multiply)
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;
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class_<image_32,boost::shared_ptr<image_32> >("Image","This class represents a 32 bit RGBA image.",init<int,int>())
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.def("width",&image_32::width)
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.def("height",&image_32::height)
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.def("view",&image_32::get_view)
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.add_property("background",make_function
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(&image_32::get_background,return_value_policy<copy_const_reference>()),
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&image_32::set_background, "The background color of the image.")
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.def("set_grayscale_to_alpha",&image_32::set_grayscale_to_alpha, "Set the grayscale values to the alpha channel of the Image")
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.def("set_color_to_alpha",&image_32::set_color_to_alpha, "Set a given color to the alpha channel of the Image")
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.def("set_alpha",&image_32::set_alpha, "Set the overall alpha channel of the Image")
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.def("blend",&blend)
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.def("composite",&composite)
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//TODO(haoyu) The method name 'tostring' might be confusing since they actually return bytes in Python 3
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.def("tostring",&tostring1)
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.def("tostring",&tostring2)
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.def("save", save_to_file1)
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.def("save", save_to_file2)
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.def("open",open_from_file)
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.staticmethod("open")
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#if defined(HAVE_CAIRO) && defined(HAVE_PYCAIRO)
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.def("from_cairo",&from_cairo)
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.staticmethod("from_cairo")
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#endif
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;
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}
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