302 lines
9.1 KiB
C++
302 lines
9.1 KiB
C++
/*****************************************************************************
|
|
*
|
|
* This file is part of Mapnik (c++ mapping toolkit)
|
|
*
|
|
* Copyright (C) 2006 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
|
|
*
|
|
*****************************************************************************/
|
|
|
|
//$Id: image_util.hpp 39 2005-04-10 20:39:53Z pavlenko $
|
|
|
|
#ifndef IMAGE_UTIL_HPP
|
|
#define IMAGE_UTIL_HPP
|
|
|
|
// mapnik
|
|
#include <mapnik/config.hpp>
|
|
#include <mapnik/graphics.hpp>
|
|
|
|
// boost
|
|
#include <boost/algorithm/string.hpp>
|
|
|
|
// stl
|
|
#include <string>
|
|
|
|
namespace mapnik {
|
|
|
|
class ImageWriterException : public std::exception
|
|
{
|
|
private:
|
|
std::string message_;
|
|
public:
|
|
ImageWriterException(const std::string& message)
|
|
: message_(message) {}
|
|
|
|
~ImageWriterException() throw() {}
|
|
|
|
virtual const char* what() const throw()
|
|
{
|
|
return message_.c_str();
|
|
}
|
|
};
|
|
|
|
template <typename T>
|
|
MAPNIK_DECL void save_to_file(std::string const& filename,
|
|
std::string const& type,
|
|
T const& image);
|
|
// guess type from file extension
|
|
template <typename T>
|
|
MAPNIK_DECL void save_to_file(std::string const& filename,
|
|
T const& image);
|
|
|
|
template <typename T>
|
|
void save_as_png(std::string const& filename,
|
|
T const& image);
|
|
|
|
template <typename T>
|
|
void save_as_jpeg(std::string const& filename,
|
|
int quality,
|
|
T const& image);
|
|
|
|
inline bool is_png (std::string const& filename)
|
|
{
|
|
return boost::algorithm::iends_with(filename,std::string(".png"));
|
|
}
|
|
|
|
inline bool is_jpeg (std::string const& filename)
|
|
{
|
|
return boost::algorithm::iends_with(filename,std::string(".jpg")) ||
|
|
boost::algorithm::iends_with(filename,std::string(".jpeg"));
|
|
}
|
|
|
|
inline bool is_tiff (std::string const& filename)
|
|
{
|
|
return boost::algorithm::iends_with(filename,std::string(".tif")) ||
|
|
boost::algorithm::iends_with(filename,std::string(".tiff"));
|
|
}
|
|
|
|
inline std::string type_from_filename(std::string const& filename)
|
|
{
|
|
if (is_png(filename)) return "png";
|
|
if (is_jpeg(filename)) return "jpeg";
|
|
if (is_tiff(filename)) return "tiff";
|
|
return "unknown";
|
|
}
|
|
|
|
template <typename T>
|
|
double distance(T x0,T y0,T x1,T y1)
|
|
{
|
|
double dx = x1-x0;
|
|
double dy = y1-y0;
|
|
return sqrt(dx * dx + dy * dy);
|
|
}
|
|
|
|
template <typename Image>
|
|
inline void scale_down2(Image& target,const Image& source)
|
|
{
|
|
int source_width=source.width();
|
|
int source_height=source.height();
|
|
|
|
int target_width=target.width();
|
|
int target_height=target.height();
|
|
if (target_width<source_width/2 || target_height<source_height/2)
|
|
return;
|
|
int y1,x1;
|
|
for (int y=0;y<target_height;++y)
|
|
{
|
|
y1=2*y;
|
|
for(int x=0;x<target_width;++x)
|
|
{
|
|
x1=2*x;
|
|
//todo calculate average???
|
|
target(x,y)=source(x1,y1);
|
|
}
|
|
}
|
|
}
|
|
|
|
template <typename Image,int scale>
|
|
struct image_op
|
|
{
|
|
static void scale_up(Image& target,const Image& source)
|
|
{
|
|
if (scale<3) return;
|
|
int source_width=source.width();
|
|
int source_height=source.height();
|
|
|
|
int target_width=target.width();
|
|
int target_height=target.height();
|
|
if (target_width<scale*source_width || target_height<scale*source_height)
|
|
return;
|
|
for (int y=0;y<source_height;++y)
|
|
{
|
|
for(int x=0;x<source_width;++x)
|
|
{
|
|
unsigned p=source(x,y);
|
|
for (int i=0;i<scale;++i)
|
|
for (int j=0;j<scale;++j)
|
|
target(scale*x+i,scale*y+j)=p;
|
|
}
|
|
}
|
|
}
|
|
};
|
|
|
|
template <typename Image>
|
|
struct image_op<Image,2>
|
|
{
|
|
static void scale_up(Image& target,const Image& source)
|
|
{
|
|
int source_width=source.width();
|
|
int source_height=source.height();
|
|
|
|
int target_width=target.width();
|
|
int target_height=target.height();
|
|
if (target_width<2*source_width || target_height<2*source_height)
|
|
return;
|
|
for (int y=0;y<source_height;++y)
|
|
{
|
|
for(int x=0;x<source_width;++x)
|
|
{
|
|
target(2*x,2*y)=source(x,y);
|
|
target(2*x+1,2*y)=source(x,y);
|
|
target(2*x+1,2*y+1)=source(x,y);
|
|
target(2*x,2*y+1)=source(x,y);
|
|
}
|
|
}
|
|
}
|
|
};
|
|
|
|
namespace
|
|
{
|
|
template <typename Image>
|
|
inline void scale_up(Image& target,const Image& source,unsigned scale)
|
|
{
|
|
int source_width=source.width();
|
|
int source_height=source.height();
|
|
|
|
int target_width=target.width();
|
|
int target_height=target.height();
|
|
if (target_width<scale*source_width || target_height<scale*source_height)
|
|
return;
|
|
for (int y=0;y<source_height;++y)
|
|
{
|
|
for(int x=0;x<source_width;++x)
|
|
{
|
|
unsigned p=source(x,y);
|
|
for (int i=0;i<scale;++i)
|
|
for (int j=0;j<scale;++j)
|
|
target(scale*x+i,scale*y+j)=p;
|
|
}
|
|
}
|
|
}
|
|
}
|
|
|
|
template <typename Image>
|
|
void scale_image(Image& target,const Image& source,unsigned scale)
|
|
{
|
|
if (scale==2)
|
|
{
|
|
image_op<Image,2>::scale_up(target,source);
|
|
}
|
|
else
|
|
{
|
|
scale_up<Image>(target,source,scale);
|
|
}
|
|
}
|
|
|
|
template <typename Image>
|
|
inline void scale_image (Image& target,const Image& source)
|
|
{
|
|
|
|
int source_width=source.width();
|
|
int source_height=source.height();
|
|
|
|
int target_width=target.width();
|
|
int target_height=target.height();
|
|
|
|
if (source_width<1 || source_height<1 ||
|
|
target_width<1 || target_height<1) return;
|
|
int int_part_y=source_height/target_height;
|
|
int fract_part_y=source_height%target_height;
|
|
int err_y=0;
|
|
int int_part_x=source_width/target_width;
|
|
int fract_part_x=source_width%target_width;
|
|
int err_x=0;
|
|
int x=0,y=0,xs=0,ys=0;
|
|
int prev_y=-1;
|
|
for (y=0;y<target_height;++y)
|
|
{
|
|
if (ys==prev_y)
|
|
{
|
|
target.setRow(y,target.getRow(y-1),target_width);
|
|
}
|
|
else
|
|
{
|
|
xs=0;
|
|
for (x=0;x<target_width;++x)
|
|
{
|
|
target(x,y)=source(xs,ys);
|
|
xs+=int_part_x;
|
|
err_x+=fract_part_x;
|
|
if (err_x>=target_width)
|
|
{
|
|
err_x-=target_width;
|
|
++xs;
|
|
}
|
|
}
|
|
prev_y=ys;
|
|
}
|
|
ys+=int_part_y;
|
|
err_y+=fract_part_y;
|
|
if (err_y>=target_height)
|
|
{
|
|
err_y-=target_height;
|
|
++ys;
|
|
}
|
|
}
|
|
}
|
|
|
|
inline MAPNIK_DECL void save_to_file (std::string const& file,
|
|
std::string const& type,
|
|
Image32 const& image)
|
|
{
|
|
save_to_file<ImageData32>(file,type,image.data());
|
|
}
|
|
|
|
inline MAPNIK_DECL void save_to_file(std::string const& file,
|
|
Image32 const& image)
|
|
{
|
|
save_to_file<ImageData32>(file,image.data());
|
|
}
|
|
|
|
#ifdef _MSC_VER
|
|
template MAPNIK_DECL void save_to_file<ImageData32>(std::string const&,
|
|
std::string const& ,
|
|
ImageData32 const&);
|
|
template MAPNIK_DECL void save_to_file<ImageData32>(std::string const&,
|
|
ImageData32 const&);
|
|
|
|
template MAPNIK_DECL void save_to_file<image_view<ImageData32> > (std::string const&,
|
|
std::string const& ,
|
|
image_view<ImageData32> const&);
|
|
|
|
template MAPNIK_DECL void save_to_file<image_view<ImageData32> > (std::string const&,
|
|
image_view<ImageData32> const&);
|
|
|
|
#endif
|
|
|
|
}
|
|
|
|
#endif //IMAGE_UTIL_HPP
|