87 lines
2.6 KiB
C++
87 lines
2.6 KiB
C++
/*****************************************************************************
|
|
*
|
|
* This file is part of Mapnik (c++ mapping toolkit)
|
|
*
|
|
* Copyright (C) 2014 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
|
|
*
|
|
*****************************************************************************
|
|
*
|
|
* Initially developed by Sandro Santilli <strk@keybit.net>
|
|
*
|
|
*****************************************************************************/
|
|
|
|
#ifndef PGRASTER_WKB_READER_HPP
|
|
#define PGRASTER_WKB_READER_HPP
|
|
|
|
// mapnik
|
|
#include <mapnik/feature.hpp> // for raster_ptr
|
|
|
|
// boost
|
|
#include <boost/cstdint.hpp> // for boost::uint8_t
|
|
|
|
enum pgraster_color_interp {
|
|
// Automatic color interpretation:
|
|
// uses grayscale for single band, rgb for 3 bands
|
|
// rgba for 4 bands
|
|
pgr_auto,
|
|
// Grayscale interpretation
|
|
pgr_grayscale,
|
|
pgr_indexed,
|
|
pgr_rgb,
|
|
pgr_rgba
|
|
};
|
|
|
|
class pgraster_wkb_reader
|
|
{
|
|
public:
|
|
|
|
pgraster_wkb_reader(const uint8_t* wkb, int size, int bnd=0)
|
|
: wkbsize_(size), wkb_(wkb), wkbend_(wkb+size), ptr_(wkb), bandno_(bnd)
|
|
{}
|
|
|
|
mapnik::raster_ptr get_raster();
|
|
|
|
/// @param bnd band number. If 0 (default) it'll try to read all bands
|
|
/// with automatic color interpretation (rgb for 3 bands,
|
|
/// rgba for 4 bands, grayscale for 1 band).
|
|
/// Any other value results in pixel
|
|
/// values being copied verbatim into the returned raster
|
|
/// for interpretation by the caller.
|
|
static mapnik::raster_ptr read(const uint8_t* wkb, int size, int bnd=0)
|
|
{
|
|
pgraster_wkb_reader reader(wkb,size,bnd);
|
|
return reader.get_raster();
|
|
}
|
|
|
|
private:
|
|
void read_indexed(mapnik::raster_ptr raster);
|
|
void read_grayscale(mapnik::raster_ptr raster);
|
|
void read_rgba(mapnik::raster_ptr raster);
|
|
|
|
int wkbsize_;
|
|
const uint8_t* wkb_;
|
|
const uint8_t* wkbend_;
|
|
const uint8_t* ptr_;
|
|
uint8_t endian_;
|
|
int bandno_;
|
|
uint16_t numBands_;
|
|
uint16_t width_;
|
|
uint16_t height_;
|
|
};
|
|
|
|
|
|
#endif // PGRASTER_WKB_READER_HPP
|