/***************************************************************************** * * This file is part of Mapnik (c++ mapping toolkit) * * Copyright (C) 2016 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 * *****************************************************************************/ #if defined(HAVE_PNG) extern "C" { #include } #ifndef PNG_FAST_FILTERS // libpng < 1.6 #define PNG_FAST_FILTERS ( PNG_FILTER_NONE | PNG_FILTER_SUB | PNG_FILTER_UP ) #endif #endif // HAVE_PNG // mapnik #if defined(HAVE_PNG) #include #endif #include #include #include #include #include #include #include // stl #include #include namespace mapnik { #if defined(HAVE_PNG) void handle_png_options(std::string const& type, png_options & opts) { if (type == "png" || type == "png24" || type == "png32") { opts.paletted = false; return; } else if (type == "png8" || type == "png256") { opts.paletted = true; return; } bool set_colors = false; bool set_gamma = false; for (auto const& kv : parse_image_options(type)) { auto const& key = kv.first; auto const& val = kv.second; if (key == "png8" || key == "png256") { opts.paletted = true; } else if (key == "png" || key == "png24" || key == "png32") { opts.paletted = false; } else if (key == "m" && val) { if (*val == "o") opts.use_hextree = false; else if (*val == "h") opts.use_hextree = true; } else if (key == "e" && val && *val == "miniz") { throw image_writer_exception("miniz support has been removed from Mapnik"); } else if (key == "c") { set_colors = true; if (!val || !mapnik::util::string2int(*val, opts.colors) || opts.colors < 1 || opts.colors > 256) { throw image_writer_exception("invalid color parameter: " + to_string(val)); } } else if (key == "t") { if (!val || !mapnik::util::string2int(*val,opts.trans_mode) || opts.trans_mode < 0 || opts.trans_mode > 2) { throw image_writer_exception("invalid trans_mode parameter: " + to_string(val)); } } else if (key == "g") { set_gamma = true; if (!val || !mapnik::util::string2double(*val, opts.gamma) || opts.gamma < 0) { throw image_writer_exception("invalid gamma parameter: " + to_string(val)); } } else if (key == "z") { /* #define Z_NO_COMPRESSION 0 #define Z_BEST_SPEED 1 #define Z_BEST_COMPRESSION 9 #define Z_DEFAULT_COMPRESSION (-1) */ if (!val || !mapnik::util::string2int(*val, opts.compression) || opts.compression < Z_DEFAULT_COMPRESSION || opts.compression > 10) // use 10 here rather than Z_BEST_COMPRESSION (9) to allow for MZ_UBER_COMPRESSION { throw image_writer_exception("invalid compression parameter: " + to_string(val) + " (only -1 through 10 are valid)"); } } else if (key == "s") { if (!val) throw image_writer_exception("invalid compression parameter: "); if (*val == "default") { opts.strategy = Z_DEFAULT_STRATEGY; } else if (*val == "filtered") { opts.strategy = Z_FILTERED; } else if (*val == "huff") { opts.strategy = Z_HUFFMAN_ONLY; } else if (*val == "rle") { opts.strategy = Z_RLE; } else if (*val == "fixed") { opts.strategy = Z_FIXED; } else { throw image_writer_exception("invalid compression strategy parameter: " + *val); } } else if (key == "f") { // filters = PNG_NO_FILTERS; // filters = PNG_ALL_FILTERS; // filters = PNG_FAST_FILTERS; // filters = PNG_FILTER_NONE | PNG_FILTER_SUB | PNG_FILTER_UP | PNG_FILTER_AVG | PNG_FILTER_PAETH; if (!val) throw image_writer_exception("invalid filters parameter: "); if (*val == "no") opts.filters = PNG_NO_FILTERS; else if (*val == "all") opts.filters = PNG_ALL_FILTERS; else if (*val == "fast") opts.filters = PNG_FAST_FILTERS; else opts.filters = parse_png_filters(*val); // none | sub | up | avg | paeth } else { throw image_writer_exception("unhandled png option: " + key); } } // validation if (!opts.paletted && set_colors) { throw image_writer_exception("invalid color parameter: unavailable for true color (non-paletted) images"); } if (!opts.paletted && set_gamma) { throw image_writer_exception("invalid gamma parameter: unavailable for true color (non-paletted) images"); } if (opts.compression > Z_BEST_COMPRESSION) { throw image_writer_exception("invalid compression value: (only -1 through 9 are valid)"); } } #endif png_saver::png_saver(std::ostream & stream, std::string const& t): stream_(stream), t_(t) {} png_saver_pal::png_saver_pal(std::ostream & stream, std::string const& t, rgba_palette const& pal): stream_(stream), t_(t), pal_(pal) {} template<> void png_saver::operator() (image_null const& image) const { throw image_writer_exception("null images not supported for png"); } template<> void png_saver_pal::operator() (image_null const& image) const { throw image_writer_exception("null images not supported for png"); } template<> void png_saver::operator() (image_view_null const& image) const { throw image_writer_exception("null image views not supported for png"); } template<> void png_saver_pal::operator() (image_view_null const& image) const { throw image_writer_exception("null image views not supported for png"); } template void process_rgba8_png_pal(T const& image, std::string const& t, std::ostream & stream, rgba_palette const& pal) { #if defined(HAVE_PNG) png_options opts; handle_png_options(t, opts); if (pal.valid()) { save_as_png8_pal(stream, image, pal, opts); } else if (opts.paletted) { if (opts.use_hextree) { save_as_png8_hex(stream, image, opts); } else { save_as_png8_oct(stream, image, opts); } } else { save_as_png(stream, image, opts); } #else throw image_writer_exception("png output is not enabled in your build of Mapnik"); #endif } template void process_rgba8_png(T const& image, std::string const& t, std::ostream & stream) { #if defined(HAVE_PNG) png_options opts; handle_png_options(t, opts); if (opts.paletted) { if (opts.use_hextree) { save_as_png8_hex(stream, image, opts); } else { save_as_png8_oct(stream, image, opts); } } else { save_as_png(stream, image, opts); } #else throw image_writer_exception("png output is not enabled in your build of Mapnik"); #endif } template<> void png_saver_pal::operator() (image_rgba8 const& image) const { process_rgba8_png_pal(image, t_, stream_, pal_); } template<> void png_saver_pal::operator() (image_view_rgba8 const& image) const { process_rgba8_png_pal(image, t_, stream_, pal_); } template<> void png_saver::operator() (image_rgba8 const& image) const { process_rgba8_png(image, t_, stream_); } template<> void png_saver::operator() (image_view_rgba8 const& image) const { process_rgba8_png(image, t_, stream_); } template void png_saver::operator() (T const& image) const { #if defined(HAVE_PNG) throw image_writer_exception("Mapnik does not support grayscale images for png"); //png_options opts; //handle_png_options(t_, opts); //save_as_png(stream_, image, opts); #else throw image_writer_exception("png output is not enabled in your build of Mapnik"); #endif } template void png_saver_pal::operator() (T const& image) const { #if defined(HAVE_PNG) throw image_writer_exception("Mapnik does not support grayscale images for png"); //png_options opts; //handle_png_options(t_, opts); //save_as_png(stream_, image, opts); #else throw image_writer_exception("png output is not enabled in your build of Mapnik"); #endif } template void png_saver::operator() (image_gray8 const& image) const; template void png_saver::operator() (image_gray8s const& image) const; template void png_saver::operator() (image_gray16 const& image) const; template void png_saver::operator() (image_gray16s const& image) const; template void png_saver::operator() (image_gray32 const& image) const; template void png_saver::operator() (image_gray32s const& image) const; template void png_saver::operator() (image_gray32f const& image) const; template void png_saver::operator() (image_gray64 const& image) const; template void png_saver::operator() (image_gray64s const& image) const; template void png_saver::operator() (image_gray64f const& image) const; template void png_saver::operator() (image_view_gray8 const& image) const; template void png_saver::operator() (image_view_gray8s const& image) const; template void png_saver::operator() (image_view_gray16 const& image) const; template void png_saver::operator() (image_view_gray16s const& image) const; template void png_saver::operator() (image_view_gray32 const& image) const; template void png_saver::operator() (image_view_gray32s const& image) const; template void png_saver::operator() (image_view_gray32f const& image) const; template void png_saver::operator() (image_view_gray64 const& image) const; template void png_saver::operator() (image_view_gray64s const& image) const; template void png_saver::operator() (image_view_gray64f const& image) const; template void png_saver_pal::operator() (image_gray8 const& image) const; template void png_saver_pal::operator() (image_gray8s const& image) const; template void png_saver_pal::operator() (image_gray16 const& image) const; template void png_saver_pal::operator() (image_gray16s const& image) const; template void png_saver_pal::operator() (image_gray32 const& image) const; template void png_saver_pal::operator() (image_gray32s const& image) const; template void png_saver_pal::operator() (image_gray32f const& image) const; template void png_saver_pal::operator() (image_gray64 const& image) const; template void png_saver_pal::operator() (image_gray64s const& image) const; template void png_saver_pal::operator() (image_gray64f const& image) const; template void png_saver_pal::operator() (image_view_gray8 const& image) const; template void png_saver_pal::operator() (image_view_gray8s const& image) const; template void png_saver_pal::operator() (image_view_gray16 const& image) const; template void png_saver_pal::operator() (image_view_gray16s const& image) const; template void png_saver_pal::operator() (image_view_gray32 const& image) const; template void png_saver_pal::operator() (image_view_gray32s const& image) const; template void png_saver_pal::operator() (image_view_gray32f const& image) const; template void png_saver_pal::operator() (image_view_gray64 const& image) const; template void png_saver_pal::operator() (image_view_gray64s const& image) const; template void png_saver_pal::operator() (image_view_gray64f const& image) const; } // end ns