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/*****************************************************************************
*
* This file is part of Mapnik (c++ mapping toolkit)
*
* Copyright (C) 2011 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
*
*****************************************************************************/
// mapnik
#include <mapnik/debug.hpp>
#include <mapnik/image_reader.hpp>
// boost
#include <boost/shared_ptr.hpp>
#include <boost/filesystem/operations.hpp>
// stl
#include <iostream>
extern "C"
{
#include <tiffio.h>
}
namespace mapnik
{
using std::min;
using std::max;
class tiff_reader : public image_reader
{
typedef boost::shared_ptr<TIFF> tiff_ptr;
struct tiff_closer
{
void operator() (TIFF * tif)
{
if (tif != 0)
{
TIFFClose(tif);
}
}
};
private:
std::string file_name_;
int read_method_;
unsigned width_;
unsigned height_;
int rows_per_strip_;
int tile_width_;
int tile_height_;
tiff_ptr tif_;
bool premultiplied_alpha_;
public:
enum TiffType {
generic=1,
stripped,
tiled
};
explicit tiff_reader(std::string const& file_name);
virtual ~tiff_reader();
unsigned width() const;
unsigned height() const;
bool premultiplied_alpha() const;
void read(unsigned x,unsigned y,image_data_32& image);
private:
tiff_reader(const tiff_reader&);
tiff_reader& operator=(const tiff_reader&);
void init();
void read_generic(unsigned x,unsigned y,image_data_32& image);
void read_stripped(unsigned x,unsigned y,image_data_32& image);
void read_tiled(unsigned x,unsigned y,image_data_32& image);
TIFF* load_if_exists(std::string const& filename);
};
namespace
{
image_reader* create_tiff_reader(std::string const& file)
{
return new tiff_reader(file);
}
const bool registered = register_image_reader("tiff",create_tiff_reader);
}
tiff_reader::tiff_reader(std::string const& file_name)
: file_name_(file_name),
read_method_(generic),
width_(0),
height_(0),
rows_per_strip_(0),
tile_width_(0),
tile_height_(0),
premultiplied_alpha_(false)
{
init();
}
void tiff_reader::init()
{
// TODO: error handling
TIFFSetWarningHandler(0);
TIFF* tif = load_if_exists(file_name_);
if (!tif) throw image_reader_exception( std::string("Can't load tiff file: '") + 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;
}
//TIFFTAG_EXTRASAMPLES
uint16 extrasamples;
uint16* sampleinfo;
TIFFGetFieldDefaulted(tif, TIFFTAG_EXTRASAMPLES,
&extrasamples, &sampleinfo);
if (extrasamples == 1 &&
sampleinfo[0] == EXTRASAMPLE_ASSOCALPHA)
{
premultiplied_alpha_ = true;
}
}
else
{
throw image_reader_exception(msg);
}
}
tiff_reader::~tiff_reader()
{
}
unsigned tiff_reader::width() const
{
return width_;
}
unsigned tiff_reader::height() const
{
return height_;
}
bool tiff_reader::premultiplied_alpha() const
{
return premultiplied_alpha_;
}
void tiff_reader::read(unsigned x,unsigned y,image_data_32& 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 tiff_reader::read_generic(unsigned /*x*/,unsigned /*y*/,image_data_32& /*image*/)
{
TIFF* tif = load_if_exists(file_name_);
if (tif)
{
MAPNIK_LOG_DEBUG(tiff_reader) << "tiff_reader: TODO - tiff is not stripped or tiled";
}
}
void tiff_reader::read_tiled(unsigned x0,unsigned y0,image_data_32& image)
{
TIFF* tif = load_if_exists(file_name_);
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 = max(y0,(unsigned)y) - y;
ty1 = 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=max(x0,(unsigned)x);
tx1=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);
}
}
void tiff_reader::read_stripped(unsigned x0,unsigned y0,image_data_32& image)
{
TIFF* tif = load_if_exists(file_name_);
if (tif)
{
uint32* buf = (uint32*)_TIFFmalloc(width_*rows_per_strip_*sizeof(uint32));
int width=image.width();
int height=image.height();
unsigned start_y=(y0/rows_per_strip_)*rows_per_strip_;
unsigned 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=min(width+x0,(unsigned)width_);
for (unsigned y=start_y; y < end_y; y+=rows_per_strip_)
{
ty0 = max(y0,y)-y;
ty1 = 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);
}
}
TIFF* tiff_reader::load_if_exists(std::string const& filename)
{
if (!tif_)
{
boost::filesystem::path path(file_name_);
if (boost::filesystem::is_regular(path)) // exists and regular file
{
// File path is a full file path and does exist
tif_ = tiff_ptr(TIFFOpen(filename.c_str(), "rb"), tiff_closer());
}
}
return tif_.get();
}
} // namespace mapnik
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