85 lines
2.7 KiB
C++
85 lines
2.7 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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*
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* Initially developed by Sandro Santilli <strk@keybit.net> for CartoDB
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*
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*****************************************************************************/
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#ifndef PGRASTER_WKB_READER_HPP
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#define PGRASTER_WKB_READER_HPP
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// mapnik
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#include <mapnik/feature.hpp> // for raster_ptr
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#include <mapnik/box2d.hpp>
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enum pgraster_color_interp {
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// Automatic color interpretation:
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// uses grayscale for single band, rgb for 3 bands
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// rgba for 4 bands
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pgr_auto,
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// Grayscale interpretation
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pgr_grayscale,
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pgr_indexed,
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pgr_rgb,
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pgr_rgba
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};
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class pgraster_wkb_reader
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{
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public:
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pgraster_wkb_reader(const uint8_t* wkb, int size, int bnd=0)
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: ptr_(wkb), bandno_(bnd)
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{}
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mapnik::raster_ptr get_raster();
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/// @param bnd band number. If 0 (default) it'll try to read all bands
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/// with automatic color interpretation (rgb for 3 bands,
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/// rgba for 4 bands, grayscale for 1 band).
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/// Any other value results in pixel
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/// values being copied verbatim into the returned raster
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/// for interpretation by the caller.
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static mapnik::raster_ptr read(const uint8_t* wkb, int size, int bnd=0)
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{
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pgraster_wkb_reader reader(wkb,size,bnd);
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return reader.get_raster();
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}
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private:
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mapnik::raster_ptr read_indexed(mapnik::box2d<double> const& bbox, uint16_t width, uint16_t height);
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mapnik::raster_ptr read_grayscale(mapnik::box2d<double> const& bbox, uint16_t width, uint16_t height);
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mapnik::raster_ptr read_rgba(mapnik::box2d<double> const& bbox, uint16_t width, uint16_t height);
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//int wkbsize_;
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//const uint8_t* wkb_;
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//const uint8_t* wkbend_;
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const uint8_t* ptr_;
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uint8_t endian_;
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int bandno_;
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uint16_t numBands_;
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uint16_t width_;
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uint16_t height_;
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};
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#endif // PGRASTER_WKB_READER_HPP
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