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tiff_reader.cc
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tiff_reader.cc
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/* This file is part of Mapnik (c++ mapping toolkit)
* Copyright (C) 2005 Artem Pavlenko
*
* Mapnik is free software; you can redistribute it and/or
* modify it under the terms of the GNU General Public License
* as published by the Free Software Foundation; either version 2
* of the License, or any later version.
*
* This program 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 General Public License for more details.
*
* You should have received a copy of the GNU General Public License
* along with this program; if not, write to the Free Software
* Foundation, Inc., 59 Temple Place - Suite 330, Boston, MA 02111-1307, USA.
*/
//$Id$
#include "image_reader.hh"
#include <tiffio.h>
#include <iostream>
namespace mapnik
{
class TiffReader : public ImageReader
{
private:
std::string file_name_;
int read_method_;
unsigned width_;
unsigned height_;
int rows_per_strip_;
int tile_width_;
int tile_height_;
public:
enum
{
generic=1,
stripped,
tiled
};
explicit TiffReader(const std::string& file_name);
virtual ~TiffReader();
unsigned width() const;
unsigned height() const;
void read(unsigned x,unsigned y,ImageData32& image);
private:
TiffReader(const TiffReader&);
TiffReader& operator=(const TiffReader&);
void init();
void read_generic(unsigned x,unsigned y,ImageData32& image);
void read_stripped(unsigned x,unsigned y,ImageData32& image);
void read_tiled(unsigned x,unsigned y,ImageData32& image);
};
namespace
{
ImageReader* createTiffReader(const std::string& file)
{
return new TiffReader(file);
}
const bool registered = register_image_reader("tiff",createTiffReader);
}
TiffReader::TiffReader(const std::string& file_name)
: file_name_(file_name),
read_method_(generic),
width_(0),
height_(0),
rows_per_strip_(0),
tile_width_(0),
tile_height_(0)
{
try
{
init();
}
catch (ImageReaderException& ex)
{
std::cerr<<ex.what()<<std::endl;
throw;
}
}
void TiffReader::init()
{
TIFF* tif = TIFFOpen(file_name_.c_str(), "r");
if (!tif) throw ImageReaderException("cannot open "+file_name_);
char msg[1024];
if (TIFFRGBAImageOK(tif,msg))
{
TIFFGetField(tif, TIFFTAG_IMAGEWIDTH, &width_);
TIFFGetField(tif, TIFFTAG_IMAGELENGTH, &height_);
if (TIFFIsTiled(tif))
{
TIFFGetField(tif, TIFFTAG_TILEWIDTH, &tile_width_);
TIFFGetField(tif, TIFFTAG_TILELENGTH, &tile_height_);
read_method_=tiled;
}
else if (TIFFGetField(tif,TIFFTAG_ROWSPERSTRIP,&rows_per_strip_)!=0)
{
read_method_=stripped;
}
TIFFClose(tif);
}
else
{
TIFFClose(tif);
throw ImageReaderException(msg);
}
}
TiffReader::~TiffReader()
{
//
}
unsigned TiffReader::width() const
{
return width_;
}
unsigned TiffReader::height() const
{
return height_;
}
void TiffReader::read(unsigned x,unsigned y,ImageData32& image)
{
if (read_method_==stripped)
{
read_stripped(x,y,image);
}
else if (read_method_==tiled)
{
read_tiled(x,y,image);
}
else
{
read_generic(x,y,image);
}
}
void TiffReader::read_generic(unsigned x,unsigned y,ImageData32& image)
{
TIFF* tif = TIFFOpen(file_name_.c_str(), "r");
if (tif)
{
std::cerr<<"TODO:tiff is not stripped or tiled\n";
TIFFClose(tif);
}
}
void TiffReader::read_tiled(unsigned x0,unsigned y0,ImageData32& image)
{
TIFF* tif=TIFFOpen(file_name_.c_str(), "r");
if (tif)
{
uint32* buf = (uint32*)_TIFFmalloc(tile_width_*tile_height_*sizeof(uint32));
int width=image.width();
int height=image.height();
int start_y=(y0/tile_height_)*tile_height_;
int end_y=((y0+height)/tile_height_+1)*tile_height_;
int start_x=(x0/tile_width_)*tile_width_;
int end_x=((x0+width)/tile_width_+1)*tile_width_;
int row,tx0,tx1,ty0,ty1;
for (int y=start_y;y<end_y;y+=tile_height_)
{
ty0=std::max(y0,(unsigned)y)-y;
ty1=std::min(height+y0,(unsigned)(y+tile_height_))-y;
int n0=tile_height_-ty1;
int n1=tile_height_-ty0-1;
for (int x=start_x;x<end_x;x+=tile_width_)
{
if (!TIFFReadRGBATile(tif,x,y,buf)) break;
tx0=std::max(x0,(unsigned)x);
tx1=std::min(width+x0,(unsigned)(x+tile_width_));
row=y+ty0-y0;
for (int n=n1;n>=n0;--n)
{
image.setRow(row,tx0-x0,tx1-x0,(const unsigned*)&buf[n*tile_width_+tx0-x]);
++row;
}
}
}
_TIFFfree(buf);
TIFFClose(tif);
}
}
void TiffReader::read_stripped(unsigned x0,unsigned y0,ImageData32& image)
{
TIFF* tif = TIFFOpen(file_name_.c_str(), "r");
if (tif)
{
uint32* buf = (uint32*)_TIFFmalloc(width_*rows_per_strip_*sizeof(uint32));
int width=image.width();
int height=image.height();
int start_y=(y0/rows_per_strip_)*rows_per_strip_;
int end_y=((y0+height)/rows_per_strip_+1)*rows_per_strip_;
bool laststrip=((unsigned)end_y > height_)?true:false;
int row,tx0,tx1,ty0,ty1;
tx0=x0;
tx1=std::min(width+x0,(unsigned)width_);
for (unsigned y=start_y; y < end_y; y+=rows_per_strip_)
{
ty0=std::max(y0,y)-y;
ty1=std::min(height+y0,y+rows_per_strip_)-y;
if (!TIFFReadRGBAStrip(tif,y,buf)) break;
row=y+ty0-y0;
int n0=laststrip ? 0:(rows_per_strip_-ty1);
int n1=laststrip ? (ty1-ty0-1):(rows_per_strip_-ty0-1);
for (int n=n1;n>=n0;--n)
{
image.setRow(row,tx0-x0,tx1-x0,(const unsigned*)&buf[n*width_+tx0]);
++row;
}
}
_TIFFfree(buf);
TIFFClose(tif);
}
}
}