274 lines
6.8 KiB
C++
274 lines
6.8 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) 2011 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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#include <mapnik/debug.hpp>
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#include <mapnik/image_reader.hpp>
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#include <boost/filesystem/operations.hpp>
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// stl
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#include <iostream>
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extern "C"
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{
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#include <tiffio.h>
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}
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namespace mapnik
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{
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using std::min;
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using std::max;
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class tiff_reader : public image_reader
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{
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private:
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std::string file_name_;
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int read_method_;
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unsigned width_;
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unsigned height_;
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int rows_per_strip_;
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int tile_width_;
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int tile_height_;
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public:
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enum TiffType {
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generic=1,
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stripped,
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tiled
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};
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explicit tiff_reader(const std::string& file_name);
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virtual ~tiff_reader();
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unsigned width() const;
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unsigned height() const;
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void read(unsigned x,unsigned y,image_data_32& image);
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private:
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tiff_reader(const tiff_reader&);
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tiff_reader& operator=(const tiff_reader&);
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void init();
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void read_generic(unsigned x,unsigned y,image_data_32& image);
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void read_stripped(unsigned x,unsigned y,image_data_32& image);
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void read_tiled(unsigned x,unsigned y,image_data_32& image);
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TIFF* load_if_exists(const std::string& filename);
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};
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namespace
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{
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image_reader* create_tiff_reader(const std::string& file)
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{
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return new tiff_reader(file);
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}
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const bool registered = register_image_reader("tiff",create_tiff_reader);
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}
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tiff_reader::tiff_reader(const std::string& file_name)
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: file_name_(file_name),
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read_method_(generic),
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width_(0),
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height_(0),
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rows_per_strip_(0),
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tile_width_(0),
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tile_height_(0)
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{
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init();
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}
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void tiff_reader::init()
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{
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// TODO: error handling
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TIFFSetWarningHandler(0);
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TIFF* tif = load_if_exists(file_name_);
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if (!tif) throw image_reader_exception( std::string("Can't load tiff file: '") + file_name_ + "'");
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char msg[1024];
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if (TIFFRGBAImageOK(tif,msg))
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{
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TIFFGetField(tif, TIFFTAG_IMAGEWIDTH, &width_);
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TIFFGetField(tif, TIFFTAG_IMAGELENGTH, &height_);
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if (TIFFIsTiled(tif))
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{
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TIFFGetField(tif, TIFFTAG_TILEWIDTH, &tile_width_);
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TIFFGetField(tif, TIFFTAG_TILELENGTH, &tile_height_);
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read_method_=tiled;
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}
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else if (TIFFGetField(tif,TIFFTAG_ROWSPERSTRIP,&rows_per_strip_)!=0)
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{
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read_method_=stripped;
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}
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TIFFClose(tif);
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}
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else
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{
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TIFFClose(tif);
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throw image_reader_exception(msg);
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}
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}
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tiff_reader::~tiff_reader()
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{
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//
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}
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unsigned tiff_reader::width() const
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{
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return width_;
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}
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unsigned tiff_reader::height() const
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{
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return height_;
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}
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void tiff_reader::read(unsigned x,unsigned y,image_data_32& image)
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{
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if (read_method_==stripped)
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{
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read_stripped(x,y,image);
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}
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else if (read_method_==tiled)
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{
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read_tiled(x,y,image);
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}
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else
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{
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read_generic(x,y,image);
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}
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}
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void tiff_reader::read_generic(unsigned /*x*/,unsigned /*y*/,image_data_32& /*image*/)
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{
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TIFF* tif = load_if_exists(file_name_);
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if (tif)
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{
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MAPNIK_LOG_DEBUG(tiff_reader) << "tiff_reader: TODO - tiff is not stripped or tiled";
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TIFFClose(tif);
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}
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}
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void tiff_reader::read_tiled(unsigned x0,unsigned y0,image_data_32& image)
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{
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TIFF* tif = load_if_exists(file_name_);
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if (tif)
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{
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uint32* buf = (uint32*)_TIFFmalloc(tile_width_*tile_height_*sizeof(uint32));
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int width=image.width();
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int height=image.height();
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int start_y=(y0/tile_height_)*tile_height_;
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int end_y=((y0+height)/tile_height_+1)*tile_height_;
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int start_x=(x0/tile_width_)*tile_width_;
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int end_x=((x0+width)/tile_width_+1)*tile_width_;
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int row,tx0,tx1,ty0,ty1;
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for (int y=start_y;y<end_y;y+=tile_height_)
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{
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ty0 = max(y0,(unsigned)y) - y;
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ty1 = min(height+y0,(unsigned)(y+tile_height_)) - y;
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int n0=tile_height_-ty1;
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int n1=tile_height_-ty0-1;
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for (int x=start_x;x<end_x;x+=tile_width_)
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{
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if (!TIFFReadRGBATile(tif,x,y,buf)) break;
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tx0=max(x0,(unsigned)x);
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tx1=min(width+x0,(unsigned)(x+tile_width_));
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row=y+ty0-y0;
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for (int n=n1;n>=n0;--n)
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{
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image.setRow(row,tx0-x0,tx1-x0,(const unsigned*)&buf[n*tile_width_+tx0-x]);
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++row;
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}
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}
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}
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_TIFFfree(buf);
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TIFFClose(tif);
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}
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}
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void tiff_reader::read_stripped(unsigned x0,unsigned y0,image_data_32& image)
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{
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TIFF* tif = load_if_exists(file_name_);
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if (tif)
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{
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uint32* buf = (uint32*)_TIFFmalloc(width_*rows_per_strip_*sizeof(uint32));
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int width=image.width();
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int height=image.height();
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unsigned start_y=(y0/rows_per_strip_)*rows_per_strip_;
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unsigned end_y=((y0+height)/rows_per_strip_+1)*rows_per_strip_;
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bool laststrip=((unsigned)end_y > height_)?true:false;
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int row,tx0,tx1,ty0,ty1;
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tx0=x0;
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tx1=min(width+x0,(unsigned)width_);
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for (unsigned y=start_y; y < end_y; y+=rows_per_strip_)
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{
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ty0 = max(y0,y)-y;
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ty1 = min(height+y0,y+rows_per_strip_)-y;
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if (!TIFFReadRGBAStrip(tif,y,buf)) break;
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row=y+ty0-y0;
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int n0=laststrip ? 0:(rows_per_strip_-ty1);
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int n1=laststrip ? (ty1-ty0-1):(rows_per_strip_-ty0-1);
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for (int n=n1;n>=n0;--n)
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{
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image.setRow(row,tx0-x0,tx1-x0,(const unsigned*)&buf[n*width_+tx0]);
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++row;
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}
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}
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_TIFFfree(buf);
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TIFFClose(tif);
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}
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}
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TIFF* tiff_reader::load_if_exists(std::string const& filename)
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{
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TIFF * tif = 0;
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boost::filesystem::path path(file_name_);
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if (exists(path)) // && is_regular(path)) { -- not supported in boost-1.33.*
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{
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// File path is a full file path and does exist
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tif = TIFFOpen(filename.c_str(), "rb");
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}
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return tif;
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}
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}
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