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image_io.h
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image_io.h
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/*
This file is part of the CVD Library.
Copyright (C) 2005 The Authors
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 Street, Fifth Floor, Boston, MA 02110-1301 USA
*/
#ifndef CVD_IMAGE_IO_H
#define CVD_IMAGE_IO_H
#include <cvd/config.h>
#include <cvd/exceptions.h>
#include <cvd/image_convert.h>
#include <cvd/internal/load_and_save.h>
#include <cvd/internal/name_builtin_types.h>
#include <cvd/internal/name_CVD_rgb_types.h>
#include <errno.h>
#include <memory>
#include <string>
#include <fstream>
#include <cvd/internal/io/pnm_grok.h>
#include <cvd/internal/io/save_postscript.h>
#include <cvd/internal/io/bmp.h>
#ifdef CVD_HAVE_JPEG
#include <cvd/internal/io/jpeg.h>
#endif
#ifdef CVD_HAVE_TIFF
#include <cvd/internal/io/tiff.h>
#endif
#ifdef CVD_HAVE_PNG
#include <cvd/internal/io/png.h>
#endif
namespace CVD
{
////////////////////////////////////////////////////////////////////////////////
//
// Image loading
//
#ifndef DOXYGEN_IGNORE_INTERNAL
namespace ImageType
{
enum ImageType
{
Automatic= -2,
Unknown = -1,
PNM=0,
PS=1,
EPS=2,
BMP=3,
#ifdef CVD_HAVE_JPEG
JPEG=4,
#endif
#ifdef CVD_HAVE_PNG
PNG=5,
#endif
};
}
namespace Internal
{
class ImageLoaderIstream{};
template<> struct ImagePromise<ImageLoaderIstream>
{
ImagePromise(std::istream& is)
:i(is){}
std::istream& i;
template<class C> void execute(Image<C>& im)
{
img_load(im, i);
}
};
class ImageLoaderString{};
template<> struct ImagePromise<ImageLoaderString>
{
ImagePromise(const std::string& ss)
:s(ss){}
const std::string& s;
template<class C> void execute(Image<C>& im)
{
img_load(im, s);
}
};
};
#endif
#ifdef DOXYGEN_INCLUDE_ONLY_FOR_DOCS
// This is not the real definition, but this is what it would look like if all
// the macros were expanded. The real definition is above
/// Contains the enumeration of possible image types
namespace ImageType
{
/// Possible image types
enum ImageType
{
/// Placeholder type telling @ref save_image to deduce the type from the filename
Automatic,
/// Unknown image type (can be returned by @ref string_to_image_type
Unknown,
/// PNM image format (PBM, PGM or PPM).
/// This writes 8 or 16 bit raw PGMs or PPMs. PBM is not currently supported
PNM,
/// JPEG image format. This is a compressed (lossy) image format, but defaults to 95% quality, which has very few compression artefacts. This image type is only present if libjpeg is available.
/// RGB and Greyscale JPEGs are supported
JPEG,
/// Windows BMP (or DIB) format. Uncompressed 8 bit grey scale and 24 bit RGB are supported.
BMP,
/// PNG imager format. 1, 8 and 16 bit, Greyscale, RGB and RGBA images are supported.
/// This image type is only present if libpng is available.
PNG,
/// Postscript format. This outputs a bare PostScript image with the coordinate system set up
/// to that (x,y) corresponds to pixel (x,y), with (0,0) being at the top left of the pixel (0,0).
/// The Y axis is therefore inverted compared to normal postscript drawing, but is image aligned.
/// To get the drawing axes aligned with the centre of the pixels, write the postscript command
/// ".5 .5 translate" after the image.
/// The image data in encoded in ASCII-85 for portability. Helper functions are provided for
/// generating EPS figures. See CVD::output_eps_header and CVD::output_eps_footer
PS,
/// EPS format. This outputs a complete EPS (Encapsulated PostScript) figure.
EPS,
};
}
#endif
#ifndef DOXYGEN_IGNORE_INTERNAL
Internal::ImagePromise<Internal::ImageLoaderIstream> img_load(std::istream& i);
Internal::ImagePromise<Internal::ImageLoaderString> img_load(const std::string &s);
#endif
#if DOXYGEN_INCLUDE_ONLY_FOR_DOCS
/// Load an image from an istream, and return the image.
/// The template type is deduced automatically, and must not be specified.
///
/// The type deduction is performed using lazy evaluation, so the load operation
/// is only performed if an image is assigned from this.
///
/// @param i The istream to load from
/// @ingroup gImageIO
template<class C> Image<C> img_load(std::istream& i);
/// Load an image from a file, and return the image.
/// The template type is deduced automatically, and must not be specified.
///
/// The type deduction is performed using lazy evaluation, so the load operation
/// is only performed if an image is assigned from this.
///
/// @param i The istream to load from
/// @ingroup gImageIO
template<class C> Image<C> img_load(std::string& i);
#endif
/// Load an image from a stream. This function resizes the Image as necessary.
/// It will also perform image type conversion (e.g. colour to greyscale)
/// according the Pixel:::CIE conversion.
/// @param I The pixel type of the image
/// @param im The image to receive the loaded image data
/// @param i The stream
/// @ingroup gImageIO
template<class I> void img_load(Image<I>& im, std::istream& i)
{
if(!i.good())
{
//Check for one of the commonest errors and put in
//a special case
std::ifstream* fs;
if((fs = dynamic_cast<std::ifstream*>(&i)) && !fs->is_open())
throw Exceptions::Image_IO::IfstreamNotOpen();
else
throw Exceptions::Image_IO::EofBeforeImage();
}
unsigned char c = i.peek();
if(!i.good())
throw Exceptions::Image_IO::EofBeforeImage();
if(c == 'P')
PNM::readPNM(im, i);
#ifdef CVD_HAVE_JPEG
else if(c == 0xff)
JPEG::readJPEG(im, i);
#endif
#ifdef CVD_HAVE_TIFF
else if(c == 'I')
TIFF::readTIFF(im, i);
#endif
#ifdef CVD_HAVE_PNG
else if(c == 0x89)
{
PNG::readPNG(im, i);
}
#endif
else if(c == 'B')
BMP::readBMP(im, i);
else
throw Exceptions::Image_IO::UnsupportedImageType();
}
// syg21
template<class I> void img_load(Image<I> &im, const std::string &s)
{
std::ifstream i(s.c_str(), std::ios::in|std::ios::binary);
if(!i.good())
throw Exceptions::Image_IO::OpenError(s, "for reading", errno);
img_load(im, i);
}
////////////////////////////////////////////////////////////////////////////////
//
// Image saving
//
/// Deduce an image type from a filename suffix.
/// @param name The name of the image file
ImageType::ImageType string_to_image_type(const std::string& name);
/// Save an image to a stream. This function will convert types if necessary.
/// @param PixelType The pixel type of the image
/// @param Conversion The conversion class to use
/// @param im The image to save
/// @param o The stream
/// @param t The image file format to use (see ImageType::ImageType for a list of supported formats)
/// @param cv The image instance conversion to use, if necessary (see Pixel for a list of common conversions)
/// @param channels dunno
/// @param use_16bit dunno
/// @ingroup gImageIO
template<class PixelType>
void img_save(const BasicImage<PixelType>& im, std::ostream& o, ImageType::ImageType t)
{
switch (t) {
case ImageType::PNM:
case ImageType::Automatic:
case ImageType::Unknown:
PNM::writePNM(im, o); break;
#ifdef CVD_HAVE_JPEG
case ImageType::JPEG: JPEG::writeJPEG(im,o); break;
#endif
#ifdef CVD_HAVE_PNG
case ImageType::PNG: PNG::writePNG(im,o); break;
#endif
case ImageType::PS: PS::writePS(im, o); break;
case ImageType::EPS: PS::writeEPS(im,o); break;
case ImageType::BMP: BMP::writeBMP(im,o); break;
}
}
template<class PixelType> void img_save(const BasicImage<PixelType>& im, const std::string& name, ImageType::ImageType t, ImageType::ImageType d = ImageType::PNM)
{
std::ofstream out(name.c_str(), std::ios::out|std::ios::binary);
if(!out.good())
throw Exceptions::Image_IO::OpenError(name, "for writing", errno);
if(t == ImageType::Automatic)
{
t = string_to_image_type(name);
if(t == ImageType::Unknown)
t = d;
}
img_save(im, out, t);
}
template<class PixelType> void img_save(const BasicImage<PixelType>& im, const std::string& name)
{
img_save(im, name, ImageType::Automatic);
}
////////////////////////////////////////////////////////////////////////////////
//
// Legacy pnm_* functions
//
/// Save an image to a stream as a PNM.
/// @b Deprecated Use img_save() instead, i.e. <code>img_save(im, o, ImageType::PNM);</code>
/// @param PixelType The pixel type of the image
/// @param im The image
/// @param o The stream
/// @ingroup gImageIO
template<class PixelType> void pnm_save(const BasicImage<PixelType>& im, std::ostream& o)
{
img_save(im, o, ImageType::PNM);
}
/// Load a PNM image from a stream.
/// @b Deprecated Use img_load(Image<I>& im, std::istream& i) instead. This can handle
/// and automatically detect other file formats as well.
/// @param PixelType The pixel type of the image
/// @param im The image
/// @param i The stream
/// @ingroup gImageIO
template<class PixelType> void pnm_load(Image<PixelType>& im, std::istream& i)
{
img_load(im, i);
}
////////////////////////////////////////////////////////////////////////////////
//
// Postscript helper functions
//
/// Outputs an EPS footer to an ostream
/// @param o the ostream
/// @ingroup gImageIO
void output_eps_footer(std::ostream& o);
/// Outputs an EPS header to an ostream. Typical use is to output the header,
/// save a raw PS image, output some other PS (eg annotations) and the output
/// the EPS footer.
/// @param o the ostream
/// @param xs the width of the image
/// @param ys the height of the image
/// @ingroup gImageIO
void output_eps_header(std::ostream& o, int xs, int ys);
/// Outputs an EPS header to an ostream. Typical use is to output the header,
/// save a raw PS image, output some other PS (eg annotations) and the output
/// the EPS footer.
/// @param o the ostream
/// @param s size of the image
/// @ingroup gImageIO
void output_eps_header(std::ostream & o, const ImageRef& s);
/// Outputs an EPS header to an ostream. Typical use is to output the header,
/// save a raw PS image, output some other PS (eg annotations) and the output
/// the EPS footer.
/// @param o the ostream
/// @param im the image
/// @ingroup gImageIO
template<class PixelType> void output_eps_header(std::ostream& o, const BasicImage<PixelType>& im)
{
output_eps_header(o, im.size());
}
}
#endif