/usr/include/mapnik/tiff_io.hpp is in libmapnik-dev 2.2.0+ds1-7+b2.
This file is owned by root:root, with mode 0o644.
The actual contents of the file can be viewed below.
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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
*
*****************************************************************************/
#ifndef MAPNIK_TIFF_IO_HPP
#define MAPNIK_TIFF_IO_HPP
#include <mapnik/global.hpp>
#include <mapnik/image_util.hpp>
extern "C"
{
#ifdef HAVE_GEOTIFF
#include <xtiffio.h>
#include <geotiffio.h>
#define RealTIFFOpen XTIFFClientOpen
#define RealTIFFClose XTIFFClose
#else
#include <tiffio.h>
#define RealTIFFOpen TIFFClientOpen
#define RealTIFFClose TIFFClose
#endif
}
namespace mapnik {
static tsize_t tiff_write_proc(thandle_t fd, tdata_t buf, tsize_t size)
{
std::ostream* out = reinterpret_cast<std::ostream*>(fd);
std::ios::pos_type pos = out->tellp();
std::streamsize request_size = size;
if (static_cast<tsize_t>(request_size) != size)
return static_cast<tsize_t>(-1);
out->write(reinterpret_cast<const char*>(buf), size);
if( static_cast<std::streamsize>(pos) == -1 )
{
return size;
}
else
{
return static_cast<tsize_t>(out->tellp()-pos);
}
}
static toff_t tiff_seek_proc(thandle_t fd, toff_t off, int whence)
{
std::ostream* out = reinterpret_cast<std::ostream*>(fd);
if( out->fail() )
return static_cast<toff_t>(-1);
if( static_cast<std::streamsize>(out->tellp()) == -1)
return static_cast< toff_t >( 0 );
switch(whence)
{
case SEEK_SET:
out->seekp(off, std::ios_base::beg);
break;
case SEEK_CUR:
out->seekp(off, std::ios_base::cur);
break;
case SEEK_END:
out->seekp(off, std::ios_base::end);
break;
}
// grow std::stringstream buffer (re: libtiff/tif_stream.cxx)
std::ios::pos_type pos = out->tellp();
// second check needed for clang (libcxx doesn't set failbit when seeking beyond the current buffer size
if( out->fail() || off != pos)
{
std::ios::iostate old_state;
std::ios::pos_type origin;
old_state = out->rdstate();
// reset the fail bit or else tellp() won't work below
out->clear(out->rdstate() & ~std::ios::failbit);
switch( whence )
{
case SEEK_SET:
default:
origin = 0L;
break;
case SEEK_CUR:
origin = out->tellp();
break;
case SEEK_END:
out->seekp(0, std::ios::end);
origin = out->tellp();
break;
}
// restore original stream state
out->clear(old_state);
// only do something if desired seek position is valid
if( (static_cast<uint64_t>(origin) + off) > 0L)
{
uint64_t num_fill;
// clear the fail bit
out->clear(out->rdstate() & ~std::ios::failbit);
// extend the stream to the expected size
out->seekp(0, std::ios::end);
num_fill = (static_cast<uint64_t>(origin)) + off - out->tellp();
for( uint64_t i = 0; i < num_fill; ++i)
out->put('\0');
// retry the seek
out->seekp(static_cast<std::ios::off_type>(static_cast<uint64_t>(origin) + off), std::ios::beg);
}
}
return static_cast<toff_t>(out->tellp());
}
static int tiff_close_proc(thandle_t fd)
{
std::ostream* out = (std::ostream*)fd;
out->flush();
return 0;
}
static toff_t tiff_size_proc(thandle_t fd)
{
std::ostream* out = reinterpret_cast<std::ostream*>(fd);
std::ios::pos_type pos = out->tellp();
out->seekp(0, std::ios::end);
std::ios::pos_type len = out->tellp();
out->seekp(pos);
return (toff_t)len;
}
static tsize_t tiff_dummy_read_proc(thandle_t fd, tdata_t buf, tsize_t size)
{
return 0;
}
static void tiff_dummy_unmap_proc(thandle_t fd, tdata_t base, toff_t size)
{
}
static int tiff_dummy_map_proc(thandle_t fd, tdata_t* pbase, toff_t* psize)
{
return 0;
}
template <typename T1, typename T2>
void save_as_tiff(T1 & file, T2 const& image)
{
const int width = image.width();
const int height = image.height();
const int scanline_size = sizeof(unsigned char) * width * 3;
TIFF* output = RealTIFFOpen("mapnik_tiff_stream",
"wm",
(thandle_t)&file,
tiff_dummy_read_proc,
tiff_write_proc,
tiff_seek_proc,
tiff_close_proc,
tiff_size_proc,
tiff_dummy_map_proc,
tiff_dummy_unmap_proc);
if (! output)
{
throw ImageWriterException("Could not write TIFF");
}
TIFFSetField(output, TIFFTAG_IMAGEWIDTH, width);
TIFFSetField(output, TIFFTAG_IMAGELENGTH, height);
TIFFSetField(output, TIFFTAG_COMPRESSION, COMPRESSION_DEFLATE);
TIFFSetField(output, TIFFTAG_PLANARCONFIG, PLANARCONFIG_CONTIG);
TIFFSetField(output, TIFFTAG_PHOTOMETRIC, PHOTOMETRIC_RGB);
TIFFSetField(output, TIFFTAG_BITSPERSAMPLE, 8);
TIFFSetField(output, TIFFTAG_SAMPLESPERPIXEL, 3);
TIFFSetField(output, TIFFTAG_ROWSPERSTRIP, 1);
// TODO - handle palette images
// std::vector<mapnik::rgb> const& palette
/*
unsigned short r[256], g[256], b[256];
for (int i = 0; i < (1 << 24); ++i)
{
r[i] = (unsigned short)palette[i * 3 + 0] << 8;
g[i] = (unsigned short)palette[i * 3 + 1] << 8;
b[i] = (unsigned short)palette[i * 3 + 2] << 8;
}
TIFFSetField(output, TIFFTAG_PHOTOMETRIC, PHOTOMETRIC_PALETTE);
TIFFSetField(output, TIFFTAG_COLORMAP, r, g, b);
*/
#ifdef HAVE_GEOTIFF
GTIF* geotiff = GTIFNew(output);
if (! geotiff)
{
// throw ?
}
GTIFKeySet(geotiff, GTModelTypeGeoKey, TYPE_SHORT, 1, ModelGeographic);
GTIFKeySet(geotiff, GTRasterTypeGeoKey, TYPE_SHORT, 1, RasterPixelIsPoint);
GTIFKeySet(geotiff, GeographicTypeGeoKey, TYPE_SHORT, 1, 4326); // parameter needed !
GTIFKeySet(geotiff, GeogAngularUnitsGeoKey, TYPE_SHORT, 1, Angular_Degree);
GTIFKeySet(geotiff, GeogLinearUnitsGeoKey, TYPE_SHORT, 1, Linear_Meter);
double lowerLeftLon = 130.0f; // parameter needed !
double upperRightLat = 32.0; // parameter needed !
double tiepoints[] = { 0.0, 0.0, 0.0, lowerLeftLon, upperRightLat, 0.0 };
TIFFSetField(output, TIFFTAG_GEOTIEPOINTS, sizeof(tiepoints)/sizeof(double), tiepoints);
double pixelScaleX = 0.0001; // parameter needed !
double pixelScaleY = 0.0001; // parameter needed !
double pixscale[] = { pixelScaleX, pixelScaleY, 0.0 };
TIFFSetField(output, TIFFTAG_GEOPIXELSCALE, sizeof(pixscale)/sizeof(double), pixscale);
#endif
int next_scanline = 0;
unsigned char* row = reinterpret_cast<unsigned char*>(::operator new(scanline_size));
while (next_scanline < height)
{
const unsigned* imageRow = image.getRow(next_scanline);
for (int i = 0, index = 0; i < width; ++i)
{
#ifdef MAPNIK_BIG_ENDIAN
row[index++] = (imageRow[i] >> 24) & 0xff;
row[index++] = (imageRow[i] >> 16) & 0xff;
row[index++] = (imageRow[i] >> 8) & 0xff;
#else
row[index++] = (imageRow[i]) & 0xff;
row[index++] = (imageRow[i] >> 8) & 0xff;
row[index++] = (imageRow[i] >> 16) & 0xff;
#endif
}
TIFFWriteScanline(output, row, next_scanline, 0);
++next_scanline;
}
::operator delete(row);
#ifdef HAVE_GEOTIFF
GTIFWriteKeys(geotiff);
GTIFFree(geotiff);
#endif
RealTIFFClose(output);
}
}
#endif // MAPNIK_TIFF_IO_HPP
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