384 lines
15 KiB
C++
384 lines
15 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) 2016 Artem Pavlenko
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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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// mapnik
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#if defined(HAVE_WEBP)
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#include <mapnik/webp_io.hpp>
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#endif
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#include <mapnik/image_util.hpp>
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#include <mapnik/image_util_webp.hpp>
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#include <mapnik/image.hpp>
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#include <mapnik/image_any.hpp>
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#include <mapnik/image_view.hpp>
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#include <mapnik/image_options.hpp>
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#include <mapnik/util/conversions.hpp>
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// stl
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#include <string>
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#include <iostream>
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namespace mapnik
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{
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#if defined(HAVE_WEBP)
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void handle_webp_options(std::string const& type,
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WebPConfig & config,
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bool & alpha)
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{
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if (type == "webp")
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{
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return;
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}
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if (type.length() > 4)
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{
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for (auto const& kv : parse_image_options(type))
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{
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auto const& key = kv.first;
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auto const& val = kv.second;
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if (key == "webp") continue;
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else if (key == "quality")
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{
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if (val && !(*val).empty())
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{
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double quality = 90;
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if (!mapnik::util::string2double(*val,quality) || quality < 0.0 || quality > 100.0)
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{
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throw image_writer_exception("invalid webp quality: '" + *val + "'");
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}
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config.quality = static_cast<float>(quality);
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}
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}
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else if (key == "method")
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{
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if (val && !(*val).empty())
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{
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if (!mapnik::util::string2int(*val,config.method) || config.method < 0 || config.method > 6)
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{
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throw image_writer_exception("invalid webp method: '" + *val + "'");
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}
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}
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}
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else if (key == "lossless")
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{
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if (val && !(*val).empty())
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{
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#if (WEBP_ENCODER_ABI_VERSION >> 8) >= 1 // >= v0.1.99 / 0x0100
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if (!mapnik::util::string2int(*val,config.lossless) || config.lossless < 0 || config.lossless > 1)
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{
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throw image_writer_exception("invalid webp lossless: '" + *val + "'");
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}
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#else
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#ifdef _MSC_VER
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#pragma NOTE(compiling against webp that does not support the lossless flag)
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#else
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#warning "compiling against webp that does not support the lossless flag"
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#endif
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throw image_writer_exception("your webp version does not support the lossless option");
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#endif
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}
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}
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else if (key == "image_hint")
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{
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if (val && !(*val).empty())
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{
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#if (WEBP_ENCODER_ABI_VERSION >> 8) >= 1 // >= v0.1.99 / 0x0100
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int image_hint = 0;
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if (!mapnik::util::string2int(*val,image_hint) || image_hint < 0 || image_hint > 3)
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{
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throw image_writer_exception("invalid webp image_hint: '" + *val + "'");
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}
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config.image_hint = static_cast<WebPImageHint>(image_hint);
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#else
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#ifdef _MSC_VER
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#pragma NOTE(compiling against webp that does not support the image_hint flag)
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#else
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#warning "compiling against webp that does not support the image_hint flag"
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#endif
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throw image_writer_exception("your webp version does not support the image_hint option");
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#endif
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}
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}
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else if (key == "alpha")
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{
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if (val && !(*val).empty())
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{
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if (!mapnik::util::string2bool(*val,alpha))
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{
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throw image_writer_exception("invalid webp alpha: '" + *val + "'");
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}
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}
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}
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else if (key == "target_size")
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{
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if (val && !(*val).empty())
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{
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if (!mapnik::util::string2int(*val,config.target_size))
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{
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throw image_writer_exception("invalid webp target_size: '" + *val + "'");
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}
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}
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}
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else if (key == "target_psnr")
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{
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if (val && !(*val).empty())
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{
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double psnr = 0;
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if (!mapnik::util::string2double(*val,psnr))
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{
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throw image_writer_exception("invalid webp target_psnr: '" + *val + "'");
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}
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config.target_PSNR = psnr;
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}
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}
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else if (key == "segments")
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{
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if (val && !(*val).empty())
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{
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if (!mapnik::util::string2int(*val,config.segments))
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{
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throw image_writer_exception("invalid webp segments: '" + *val + "'");
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}
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}
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}
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else if (key == "sns_strength")
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{
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if (val && !(*val).empty())
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{
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if (!mapnik::util::string2int(*val,config.sns_strength))
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{
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throw image_writer_exception("invalid webp sns_strength: '" + *val + "'");
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}
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}
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}
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else if (key == "filter_strength")
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{
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if (val && !(*val).empty())
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{
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if (!mapnik::util::string2int(*val,config.filter_strength))
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{
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throw image_writer_exception("invalid webp filter_strength: '" + *val + "'");
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}
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}
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}
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else if (key == "filter_sharpness")
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{
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if (val && !(*val).empty())
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{
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if (!mapnik::util::string2int(*val,config.filter_sharpness))
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{
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throw image_writer_exception("invalid webp filter_sharpness: '" + *val + "'");
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}
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}
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}
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else if (key == "filter_type")
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{
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if (val && !(*val).empty())
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{
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if (!mapnik::util::string2int(*val,config.filter_type))
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{
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throw image_writer_exception("invalid webp filter_type: '" + *val + "'");
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}
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}
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}
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else if (key == "autofilter")
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{
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if (val && !(*val).empty())
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{
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if (!mapnik::util::string2int(*val,config.autofilter))
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{
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throw image_writer_exception("invalid webp autofilter: '" + *val + "'");
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}
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}
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}
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else if (key == "alpha_compression")
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{
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if (val && !(*val).empty())
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{
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if (!mapnik::util::string2int(*val,config.alpha_compression))
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{
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throw image_writer_exception("invalid webp alpha_compression: '" + *val + "'");
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}
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}
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}
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else if (key == "alpha_filtering")
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{
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if (val && !(*val).empty())
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{
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#if (WEBP_ENCODER_ABI_VERSION >> 8) >= 1 // >= v0.1.99 / 0x0100
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if (!mapnik::util::string2int(*val,config.alpha_filtering))
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{
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throw image_writer_exception("invalid webp alpha_filtering: '" + *val + "'");
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}
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#else
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#ifdef _MSC_VER
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#pragma NOTE(compiling against webp that does not support the alpha_filtering flag)
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#else
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#warning "compiling against webp that does not support the alpha_filtering flag"
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#endif
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throw image_writer_exception("your webp version does not support the alpha_filtering option");
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#endif
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}
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}
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else if (key == "alpha_quality")
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{
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if (val && !(*val).empty())
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{
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#if (WEBP_ENCODER_ABI_VERSION >> 8) >= 1 // >= v0.1.99 / 0x0100
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if (!mapnik::util::string2int(*val,config.alpha_quality))
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{
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throw image_writer_exception("invalid webp alpha_quality: '" + *val + "'");
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}
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#else
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#ifdef _MSC_VER
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#pragma NOTE(compiling against webp that does not support the alpha_quality flag)
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#else
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#warning "compiling against webp that does not support the alpha_quality flag"
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#endif
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throw image_writer_exception("your webp version does not support the alpha_quality option");
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#endif
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}
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}
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else if (key == "pass")
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{
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if (val && !(*val).empty())
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{
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if (!mapnik::util::string2int(*val,config.pass))
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{
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throw image_writer_exception("invalid webp pass: '" + *val + "'");
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}
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}
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}
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else if (key == "preprocessing")
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{
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if (val && !(*val).empty())
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{
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if (!mapnik::util::string2int(*val,config.preprocessing))
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{
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throw image_writer_exception("invalid webp preprocessing: '" + *val + "'");
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}
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}
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}
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else if (key == "partitions")
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{
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if (val && !(*val).empty())
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{
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if (!mapnik::util::string2int(*val,config.partitions))
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{
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throw image_writer_exception("invalid webp partitions: '" + *val + "'");
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}
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}
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}
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else if (key == "partition_limit")
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{
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if (val && !(*val).empty())
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{
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if (!mapnik::util::string2int(*val,config.partition_limit))
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{
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throw image_writer_exception("invalid webp partition_limit: '" + *val + "'");
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}
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}
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}
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else
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{
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throw image_writer_exception("unhandled webp option: " + key);
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}
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}
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}
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}
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#endif
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webp_saver::webp_saver(std::ostream & stream, std::string const& t):
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stream_(stream), t_(t) {}
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template<>
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void webp_saver::operator()<image_null> (image_null const& image) const
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{
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throw image_writer_exception("null images not supported");
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}
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template<>
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void webp_saver::operator()<image_view_null> (image_view_null const& image) const
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{
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throw image_writer_exception("null image views not supported");
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}
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template <typename T>
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void process_rgba8_webp(T const& image, std::string const& t, std::ostream & stream)
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{
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#if defined(HAVE_WEBP)
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WebPConfig config;
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// Default values set here will be lossless=0 and quality=75 (as least as of webp v0.3.1)
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if (!WebPConfigInit(&config))
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{
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throw std::runtime_error("version mismatch");
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}
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// see for more details: https://github.com/mapnik/mapnik/wiki/Image-IO#webp-output-options
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bool alpha = true;
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handle_webp_options(t,config,alpha);
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save_as_webp(stream,image,config,alpha);
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#else
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throw image_writer_exception("webp output is not enabled in your build of Mapnik");
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#endif
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}
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template <>
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void webp_saver::operator()<image_rgba8> (image_rgba8 const& image) const
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{
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process_rgba8_webp(image, t_, stream_);
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}
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template <>
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void webp_saver::operator()<image_view_rgba8> (image_view_rgba8 const& image) const
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{
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process_rgba8_webp(image, t_, stream_);
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}
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template <typename T>
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void webp_saver::operator() (T const& image) const
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{
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throw image_writer_exception("Mapnik does not support webp grayscale images");
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}
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template void webp_saver::operator()<image_gray8> (image_gray8 const& image) const;
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template void webp_saver::operator()<image_gray8s> (image_gray8s const& image) const;
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template void webp_saver::operator()<image_gray16> (image_gray16 const& image) const;
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template void webp_saver::operator()<image_gray16s> (image_gray16s const& image) const;
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template void webp_saver::operator()<image_gray32> (image_gray32 const& image) const;
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template void webp_saver::operator()<image_gray32s> (image_gray32s const& image) const;
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template void webp_saver::operator()<image_gray32f> (image_gray32f const& image) const;
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template void webp_saver::operator()<image_gray64> (image_gray64 const& image) const;
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template void webp_saver::operator()<image_gray64s> (image_gray64s const& image) const;
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template void webp_saver::operator()<image_gray64f> (image_gray64f const& image) const;
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template void webp_saver::operator()<image_view_gray8> (image_view_gray8 const& image) const;
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template void webp_saver::operator()<image_view_gray8s> (image_view_gray8s const& image) const;
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template void webp_saver::operator()<image_view_gray16> (image_view_gray16 const& image) const;
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template void webp_saver::operator()<image_view_gray16s> (image_view_gray16s const& image) const;
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template void webp_saver::operator()<image_view_gray32> (image_view_gray32 const& image) const;
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template void webp_saver::operator()<image_view_gray32s> (image_view_gray32s const& image) const;
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template void webp_saver::operator()<image_view_gray32f> (image_view_gray32f const& image) const;
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template void webp_saver::operator()<image_view_gray64> (image_view_gray64 const& image) const;
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template void webp_saver::operator()<image_view_gray64s> (image_view_gray64s const& image) const;
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template void webp_saver::operator()<image_view_gray64f> (image_view_gray64f const& image) const;
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} // end ns
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