342 lines
11 KiB
C++
342 lines
11 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) 2014 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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#include <mapnik/config.hpp>
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// boost
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#include "boost_std_shared_shim.hpp"
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#pragma GCC diagnostic push
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#pragma GCC diagnostic ignored "-Wunused-parameter"
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#pragma GCC diagnostic ignored "-Wunused-local-typedef"
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#pragma GCC diagnostic ignored "-Wmissing-field-initializers"
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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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#pragma GCC diagnostic pop
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// mapnik
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#include <mapnik/graphics.hpp>
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#include <mapnik/palette.hpp>
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#include <mapnik/image.hpp>
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#include <mapnik/image_util.hpp>
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#include <mapnik/image_reader.hpp>
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#include <mapnik/image_compositing.hpp>
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// cairo
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#if defined(HAVE_CAIRO) && defined(HAVE_PYCAIRO)
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#include <mapnik/cairo/cairo_context.hpp>
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#include <mapnik/cairo/cairo_image_util.hpp>
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#include <pycairo.h>
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#include <cairo.h>
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#endif
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using mapnik::image;
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using mapnik::image_data_any;
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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 mapnik::save_to_file;
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using namespace boost::python;
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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 = mapnik::save_to_string(im.data(), 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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PyObject* tostring3(image_32 const & im, std::string const& format, mapnik::rgba_palette const& pal)
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{
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std::string s = mapnik::save_to_string(im.data(), format, pal);
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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& im, std::string const& filename)
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{
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save_to_file(im.data(),filename);
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}
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void save_to_file2(mapnik::image_32 const& im, std::string const& filename, std::string const& type)
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{
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save_to_file(im.data(),filename,type);
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}
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void save_to_file3(mapnik::image_32 const& im, std::string const& filename, std::string const& type, mapnik::rgba_palette const& pal)
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{
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save_to_file(im.data(),filename,type,pal);
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}
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bool painted(mapnik::image_32 const& im)
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{
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return im.painted();
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}
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bool is_solid(mapnik::image_32 const& im)
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{
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return mapnik::is_solid(im.data());
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}
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unsigned get_pixel(mapnik::image_32 const& im, int x, int y)
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{
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if (x < static_cast<int>(im.width()) && y < static_cast<int>(im.height()))
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{
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mapnik::image_data_rgba8 const & data = im.data();
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return data(x,y);
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}
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PyErr_SetString(PyExc_IndexError, "invalid x,y for image dimensions");
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boost::python::throw_error_already_set();
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return 0;
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}
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void set_pixel(mapnik::image_32 & im, unsigned x, unsigned y, mapnik::color const& c)
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{
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im.setPixel(x, y, c.rgba());
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}
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std::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::unique_ptr<image_reader> reader(get_image_reader(filename,*type));
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if (reader.get())
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{
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std::shared_ptr<image_32> image_ptr = std::make_shared<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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std::shared_ptr<image_32> fromstring(std::string const& str)
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{
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std::unique_ptr<image_reader> reader(get_image_reader(str.c_str(),str.size()));
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if (reader.get())
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{
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std::shared_ptr<image_32> image_ptr = std::make_shared<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 image from buffer" );
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}
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std::shared_ptr<image_32> frombuffer(PyObject * obj)
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{
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void const* buffer=0;
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Py_ssize_t buffer_len;
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if (PyObject_AsReadBuffer(obj, &buffer, &buffer_len) == 0)
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{
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std::unique_ptr<image_reader> reader(get_image_reader(reinterpret_cast<char const*>(buffer),buffer_len));
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if (reader.get())
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{
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std::shared_ptr<image_32> image_ptr = std::make_shared<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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}
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throw mapnik::image_reader_exception("Failed to load image from buffer" );
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}
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void blend (image_32 & im, unsigned x, unsigned y, image_32 & im2, float opacity)
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{
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mapnik::premultiply_alpha(im.data());
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mapnik::premultiply_alpha(im2.data());
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mapnik::composite(im.data(),im2.data(),mapnik::src_over,opacity,x,y);
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}
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bool premultiplied(image_32 &im)
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{
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return im.data().get_premultiplied();
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}
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void premultiply(image_32 & im)
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{
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mapnik::premultiply_alpha(im.data());
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}
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void demultiply(image_32 & im)
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{
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mapnik::demultiply_alpha(im.data());
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}
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void composite(image_32 & dst, image_32 & src, mapnik::composite_mode_e mode, float opacity)
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{
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mapnik::premultiply_alpha(dst.data());
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mapnik::premultiply_alpha(src.data());
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mapnik::composite(dst.data(),src.data(),mode,opacity,0,0);
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}
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#if defined(HAVE_CAIRO) && defined(HAVE_PYCAIRO)
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std::shared_ptr<image_32> from_cairo(PycairoSurface* py_surface)
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{
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mapnik::cairo_surface_ptr surface(cairo_surface_reference(py_surface->surface), mapnik::cairo_surface_closer());
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std::shared_ptr<image_32> image_ptr = std::make_shared<image_32>(cairo_image_surface_get_width(&*surface), cairo_image_surface_get_height(&*surface));
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cairo_image_to_rgba8(image_ptr->data(), surface);
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return image_ptr;
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}
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#endif
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// ============ image any
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std::shared_ptr<image> read_from_file_impl(std::string const& filename)
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{
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std::shared_ptr<image> img = std::make_shared<image>();
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std::unique_ptr<image_reader> reader(get_image_reader(filename));
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if (reader)
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{
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unsigned w = reader->width();
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unsigned h = reader->height();
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img->set_data(reader->read(0, 0, w, h));
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}
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return img;
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}
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// =========================
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void export_image()
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{
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using namespace boost::python;
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// NOTE: must match list in include/mapnik/image_compositing.hpp
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enum_<mapnik::composite_mode_e>("CompositeOp")
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.value("clear", mapnik::clear)
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.value("src", mapnik::src)
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.value("dst", mapnik::dst)
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.value("src_over", mapnik::src_over)
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.value("dst_over", mapnik::dst_over)
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.value("src_in", mapnik::src_in)
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.value("dst_in", mapnik::dst_in)
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.value("src_out", mapnik::src_out)
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.value("dst_out", mapnik::dst_out)
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.value("src_atop", mapnik::src_atop)
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.value("dst_atop", mapnik::dst_atop)
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.value("xor", mapnik::_xor)
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.value("plus", mapnik::plus)
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.value("minus", mapnik::minus)
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.value("multiply", mapnik::multiply)
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.value("screen", mapnik::screen)
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.value("overlay", mapnik::overlay)
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.value("darken", mapnik::darken)
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.value("lighten", mapnik::lighten)
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.value("color_dodge", mapnik::color_dodge)
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.value("color_burn", mapnik::color_burn)
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.value("hard_light", mapnik::hard_light)
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.value("soft_light", mapnik::soft_light)
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.value("difference", mapnik::difference)
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.value("exclusion", mapnik::exclusion)
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.value("contrast", mapnik::contrast)
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.value("invert", mapnik::invert)
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.value("grain_merge", mapnik::grain_merge)
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.value("grain_extract", mapnik::grain_extract)
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.value("hue", mapnik::hue)
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.value("saturation", mapnik::saturation)
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.value("color", mapnik::_color)
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.value("value", mapnik::_value)
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.value("linear_dodge", mapnik::linear_dodge)
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.value("linear_burn", mapnik::linear_burn)
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.value("divide", mapnik::divide)
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;
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class_<image, std::shared_ptr<image>, boost::noncopyable > ("ImageAny", "This class represents an any Image object", no_init)
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.def("width",&image::width)
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.def("height",&image::height)
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.def("open", &read_from_file_impl)
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.staticmethod("open")
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.def("save",&image::save_to_file)
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;
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class_<image_32,std::shared_ptr<image_32>, boost::noncopyable >("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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.def("painted",&painted)
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.def("is_solid",&is_solid)
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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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( arg("self"),
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arg("image"),
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arg("mode")=mapnik::src_over,
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arg("opacity")=1.0f
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))
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.def("premultiplied",&premultiplied)
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.def("premultiply",&premultiply)
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.def("demultiply",&demultiply)
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.def("set_pixel",&set_pixel)
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.def("get_pixel",&get_pixel)
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.def("clear",&image_32::clear)
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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("tostring",&tostring3)
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.def("save", &save_to_file1)
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.def("save", &save_to_file2)
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.def("save", &save_to_file3)
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.def("open",open_from_file)
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.staticmethod("open")
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.def("frombuffer",&frombuffer)
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.staticmethod("frombuffer")
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.def("fromstring",&fromstring)
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.staticmethod("fromstring")
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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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