#ifndef SIMAGE_H
#define SIMAGE_H

/*
 * Copyright (c) Kongsberg Oil & Gas Technologies
 *
 * Permission to use, copy, modify, and distribute this software for any
 * purpose with or without fee is hereby granted, provided that the above
 * copyright notice and this permission notice appear in all copies.
 *
 * THE SOFTWARE IS PROVIDED "AS IS" AND THE AUTHOR DISCLAIMS ALL WARRANTIES
 * WITH REGARD TO THIS SOFTWARE INCLUDING ALL IMPLIED WARRANTIES OF
 * MERCHANTABILITY AND FITNESS. IN NO EVENT SHALL THE AUTHOR BE LIABLE FOR
 * ANY SPECIAL, DIRECT, INDIRECT, OR CONSEQUENTIAL DAMAGES OR ANY DAMAGES
 * WHATSOEVER RESULTING FROM LOSS OF USE, DATA OR PROFITS, WHETHER IN AN
 * ACTION OF CONTRACT, NEGLIGENCE OR OTHER TORTIOUS ACTION, ARISING OUT OF
 * OR IN CONNECTION WITH THE USE OR PERFORMANCE OF THIS SOFTWARE.
 */

/*!
  \mainpage

  %Simage is a library capable of loading, manipulating and saving
  images, creating and saving movies (AVI and MPEG), and loading
  audio. The simage library relies heavily on 3rd party libraries to
  perform these tasks.

  The main interface for %Simage usage is documented in the main
  <simage.h> header file.

  \COIN uses %Simage just to read textures, but the programmer is of
  course free to use the other features of the simage library
  directly.

  <b>Supported image file formats:</b>

  \li JPEG: reading and writing (through libjpeg)
  \li PNG: reading and writing (using libpng and zlib)
  \li GIF
  \li TIFF
  \li RGB: reading only
  \li PIC: reading only
  \li TGA (targa): reading only
  \li EPS (encapsulated postscript): writing only

  <b>Supported video file formats:</b>

  \li AVI: writing
  \li MPEG

  <b>Supported audio file formats:</b>

  \li Ogg/Vorbis
  \li formats supported through: <a href="http://www.mega-nerd.com/libsndfile/">libsndfile</a>.
*/

/***************************************************************************/

/*! A unique identifier to recognize in source code whether or not this
 * file is included.
 */
#define __SIMAGE__

/*! Version 1.1 introduced saving */
#define SIMAGE_VERSION_1_1

/*! Version 1.2 added a new API, and support for movies */
#define SIMAGE_VERSION_1_2

/*! Version 1.3 added simage_resize3d */
#define SIMAGE_VERSION_1_3

/*! Version 1.4 added API for stream I/O */
#define SIMAGE_VERSION_1_4

/*! Version 1.5 added API for seeking and getting ("telling") the
   current position in a stream
   added API for setting and getting component order of an
   image */
#define SIMAGE_VERSION_1_5

/*! Version 1.6 added API for reading images line-by-line
   added API for loading dynamic libraries at run-time */
#define SIMAGE_VERSION_1_6

/*! These are available for adding or omitting features based on simage
 * version numbers in "client" sources. NB: they are automatically
 * synchronized with the settings in configure.in when configure is
 * run. The \#ifndefs are necessary because during development, these
 * are also defined in the config.h file generated by configure.
 */
#if !defined(SIMAGE_MAJOR_VERSION)
#undef SIMAGE_MAJOR_VERSION
#endif /* !SIMAGE_MAJOR_VERSION */
#if !defined(SIMAGE_MINOR_VERSION)
#undef SIMAGE_MINOR_VERSION
#endif /* !SIMAGE_MINOR_VERSION */
#if !defined(SIMAGE_MICRO_VERSION)
#undef SIMAGE_MICRO_VERSION
#endif /* !SIMAGE_MICRO_VERSION */
#if !defined(SIMAGE_VERSION)
#undef SIMAGE_VERSION
#endif /* !SIMAGE_VERSION */

/***************************************************************************/

/* Precaution to avoid an error easily made by the application programmer. */
#ifdef SIMAGE_DLL_API
# error Leave the internal SIMAGE_DLL_API define alone.
#endif /* SIMAGE_DLL_API */

/*! \file simage.h
  \brief Windows specific information.

  On Microsoft Windows platforms, one of these defines must always be set when
  building application programs:

  - "SIMAGE_DLL", when the application programmer is using the
  library in the form of a dynamic link library (DLL)

  - "SIMAGE_NOT_DLL", when the application programmer is using the
  library in the form of a static object library (LIB)

  Note that either SIMAGE_DLL or SIMAGE_NOT_DLL _must_ be defined by
  the application programmer on Microsoft Windows platforms, or else the
  \#error statement will be hit. Set up one or the other of these two
  defines in your compiler environment according to how the library
  was built -- as a DLL (use "SIMAGE_DLL") or as a LIB (use
  "SIMAGE_NOT_DLL").

  (Setting up defines for the compiler is typically done by either
  adding something like "/DSIMAGE_DLL" to the compiler's argument line
  (for command-line build processes), or by adding the define to the
  list of preprocessor symbols in your IDE GUI (in the MSVC IDE, this
  is done from the "Project"->"Settings" menu, choose the "C/C++" tab,
  then "Preprocessor" from the drop-down box and add the appropriate
  define)).

  It is extremely important that the application programmer uses the
  correct define, as using "SIMAGE_NOT_DLL" when "SIMAGE_DLL" is
  correct will cause mysterious crashes.
*/
#if defined(WIN32) || defined(_WIN32) || defined(__WIN32__) || defined(__NT__)
# ifdef SIMAGE_INTERNAL
#  ifdef SIMAGE_MAKE_DLL
#   define SIMAGE_DLL_API __declspec(dllexport)
#  endif /* SIMAGE_MAKE_DLL */
# else /* !SIMAGE_INTERNAL */
#  ifdef SIMAGE_DLL
#   define SIMAGE_DLL_API __declspec(dllimport)
#  else /* !SIMAGE_DLL */
#   ifndef SIMAGE_NOT_DLL
#    error Define either SIMAGE_DLL or SIMAGE_NOT_DLL as appropriate for your linkage!
#   endif /* SIMAGE_NOT_DLL */
#  endif /* !SIMAGE_DLL */
# endif /* !SIMAGE_INTERNAL */
#endif /* Microsoft Windows */

/* Empty define to avoid errors when _not_ compiling an Microsoft Windows DLL. */
#ifndef SIMAGE_DLL_API
# define SIMAGE_DLL_API
#endif /* !SIMAGE_DLL_API */

/***************************************************************************/

#ifdef __cplusplus
extern "C" {
#endif

  /*! Note specifically for Microsoft Windows that by leaving out the APIENTRY
    keyword for the function definitions, we default to the __cdecl
    calling convention. This is important to take into consideration
    when explicitly linking to the library at runtime: when using the
    wrong calling convention, obscure errors due to stack corruption
    can occur under certain (possibly rare) conditions.
  */

  /*! Returns runtime version for simage. */
  SIMAGE_DLL_API void simage_version(int * major, int * minor, int * micro);

  /*! Checks if image file format is supported. Returns 1 if \a
    filename can be loaded, 0 otherwise. */
  SIMAGE_DLL_API int simage_check_supported(const char * filename);

  /*! Attempts to read \a filename, and return a pointer to the image
    data. NULL is returned if the image could not be loaded. The
    memory is allocated using malloc(), and it is the callers
    responsibility to free the memory (using free()) \a width and \a
    height contains the width and height of the image, and \a
    numcomponents is a number indicating the following:

      1 : Grayscale image (GL_LUMINANCE)
      2 : Grayscale with alpha channel (GL_LUMINANCE_ALPHA)
      3 : RGB data (GL_RGB)
      4 : RGB data with alpha component (GL_RGBA)

    Returned image buffer must be freed by simage_free_image()
  */
  SIMAGE_DLL_API unsigned char * simage_read_image(const char * filename,
                                                   int * width, int * height,
                                                   int * numcomponents);

  /*! Returns error message, which is set when simage_read_image
     returned NULL or simage_write_image returns 0. */
  SIMAGE_DLL_API const char * simage_get_last_error(void);

  /*! Free resources allocated by either simage_read_image() or
    simage_resize() (Windows goes berzerk if you call free() from the
    client application) */
  SIMAGE_DLL_API void simage_free_image(unsigned char * imagedata);

  /*! Returns the first 2^n bigger or equal to val. If
    simage_next_power_of_two(size) != size, you'll typically need to
    resize your image to be able to use it in an OpenGL app.
  */
  SIMAGE_DLL_API int simage_next_power_of_two(int val);

  /*! Since OpenGL textures must have width and height equal to 2^n,
    this is often needed. A pointer to the new image data is returned.
    imagedata is not freed. Uses the algorithm "Filtered Image
    Rescaling" by Dale Schumacher, from GGems III.

    Scales the input \a imagedata and return a new image with the
    given dimensions returned image buffer must be freed by
    simage_free_image()
  */
  SIMAGE_DLL_API unsigned char * simage_resize(unsigned char * imagedata,
                                               int width, int height,
                                               int numcomponents,
                                               int newwidth, int newheight);

  /*! Use the plugin interface described below for extending simage
    to handle more file formats */

  struct simage_plugin
  {
    unsigned char *(*load_func)(const char * name, int * width, int * height,
                                int * numcomponents);
    int (*identify_func)(const char * filename,
                         const unsigned char * header, int headerlen);
    int (*error_func)(char * textbuffer, int bufferlen);
  };

  SIMAGE_DLL_API void * simage_add_loader(const struct simage_plugin * l,
                                          int addbefore);
  SIMAGE_DLL_API void simage_remove_loader(void * handle);


  /*****************************************************************/
  /**** NOTE: new methods for simage version 1.1 *******************/
  /*****************************************************************/

  /*! Checks if export is available for a file type. Returns 1 if a
    saver of type \a filenameextension is supported, 0 otherwise. The
    built-in savers are gif, jpg/jpeg, png, tif/tiff and rgb.
  */
  SIMAGE_DLL_API int simage_check_save_supported(const char * filenameextension);

  /*! Saves image in the format specified in \a filenameextension. Use
    simage_check_write_supported first to verify that the file format
    is supported. */
  SIMAGE_DLL_API int simage_save_image(const char * filename,
                                       const unsigned char * bytes,
                                       int w, int h, int numcomponents,
                                       const char * filenameextension);

  SIMAGE_DLL_API void * simage_add_saver(int (*save_func)(const char * name,
                                                          const unsigned char * bytes,
                                                          int width, int height, int nc),
                                         int (*error_func)(char * textbuffer, int bufferlen),
                                         const char * extensions,
                                         const char * fullname,
                                         const char * description,
                                         int addbefore);

  SIMAGE_DLL_API void simage_remove_saver(void * handle);
  SIMAGE_DLL_API int simage_get_num_savers(void);
  SIMAGE_DLL_API void * simage_get_saver_handle(int idx);
  SIMAGE_DLL_API const char * simage_get_saver_extensions(void * handle);
  SIMAGE_DLL_API const char * simage_get_saver_fullname(void * handle);
  SIMAGE_DLL_API const char * simage_get_saver_description(void * handle);


  /*****************************************************************/
  /**** NOTE: new methods for simage version 1.2 *******************/
  /*****************************************************************/

  typedef struct simage_image_s s_image;
  typedef struct simage_movie_s s_movie;
  typedef struct simage_parameters_s s_params;
  typedef int s_movie_open_func(const char *, s_movie *);
  typedef int s_movie_create_func(const char *, s_movie *, s_params *);
  typedef s_image * s_movie_get_func(s_movie *, s_image *, s_params *);
  typedef int s_movie_put_func(s_movie *, s_image *, s_params *);
  typedef void s_movie_close_func(s_movie *);

  SIMAGE_DLL_API s_image * s_image_create(int w, int h, int components,
                                          unsigned char * prealloc /* | NULL */);
  SIMAGE_DLL_API void s_image_destroy(s_image * image);

  SIMAGE_DLL_API int s_image_width(s_image * image);
  SIMAGE_DLL_API int s_image_height(s_image * image);
  SIMAGE_DLL_API int s_image_components(s_image * image);
  SIMAGE_DLL_API unsigned char * s_image_data(s_image * image);
  SIMAGE_DLL_API void s_image_set(s_image * image, int w, int h, int components,
                                  unsigned char * data, int copydata);

  SIMAGE_DLL_API s_image * s_image_load(const char * filename, s_image * prealloc /* | NULL */);
  SIMAGE_DLL_API int s_image_save(const char * filename, s_image * image,
                                  s_params * params /* | NULL */);

  SIMAGE_DLL_API s_movie * s_movie_open(const char * filename);

  /*! Will create a new move file named filename and attempt to
    locate a suitable encoder based on the parameters ( \a params )
    supplied.

    Returns a pointer to the opened movie on success, NULL on failure

    Common parameters:
      - "mime-type" \<string\> : The requested encoder type. There are currently
        2 encoders available, with mime-types "video/mpeg" and "video/avi".
      - width \<int\> : Frame width (all input images must have this width)
      - height \<int\> : Frame height (all input images must have this height)

    Parameters specific for the AVI encoder
      - fps \<int\> : Number of frames per second in output file
      - parameter file \<int\> : If this parameter is missing (or empty ""),
        a GUI will pop up each time this functions is run, asking the user
        to specify compression settings. If a filename is specified and the
        file doesn't exist, a GUI pops up, and the compression settings are
        saved in a new file with the specified filename. If the file exists,
        no GUI pops up, and the compression settings are read from the file.
        The format of the file is unspecified, and copying such a file between
        different computers probably won't work.
      - width and height must be divisible by 4
  */
  SIMAGE_DLL_API s_movie * s_movie_create(const char * filename, s_params * params /* | NULL */);

  SIMAGE_DLL_API s_image * s_movie_get_image(s_movie * movie, s_image * prealloc /* | NULL */,
                                             s_params * params /* | NULL */);

  /*! Adds (encodes) the image as one frame to the movie. \a params is
    currently used only for optimizing AVI encoding: - "allow image
    modification" \<int\> : Set to "1" to allow the encoder to modify
    the image buffer. If this parameter is not set, the encoder will
    make a local copy of the image before it is encoded.

    Example code:

    \code
    s_params *imgparams = s_params_create();
    s_params_set(imgparams,
                 "allow image modification", S_INTEGER_PARAM_TYPE, 1,
                 NULL);
    for(;;) {
      s_image_set(image, width, height, 1, <get image from somewhere>);
      for (int i=0; i<repeatCount;i++)
        s_movie_put_image(movie, image, imgparams);
    }
    s_params_destroy(imgparams);
   \endcode

   Returns 1 on success, 0 on failure
  */

  SIMAGE_DLL_API int s_movie_put_image(s_movie * movie, s_image * image,
                                       s_params * params /* | NULL */);

  /*! Closes the newly created movie file. */
  SIMAGE_DLL_API void s_movie_close(s_movie * movie);

  /*! Cleans up all resources allocated by "<s_movie_create>"(...) */
  SIMAGE_DLL_API void s_movie_destroy(s_movie * movie);

  SIMAGE_DLL_API void s_movie_importer_add(s_movie_open_func * open,
                                           s_movie_get_func * get,
                                           s_movie_close_func * close);

  SIMAGE_DLL_API void s_movie_exporter_add(s_movie_create_func * create,
                                           s_movie_put_func * put,
                                           s_movie_close_func * close);

  enum {
    S_INTEGER_PARAM_TYPE,
    S_BOOL_PARAM_TYPE = S_INTEGER_PARAM_TYPE,
    S_FLOAT_PARAM_TYPE,
    S_DOUBLE_PARAM_TYPE,
    S_STRING_PARAM_TYPE,
    S_POINTER_PARAM_TYPE,
    S_FUNCTION_PARAM_TYPE
  };

  SIMAGE_DLL_API s_params * s_params_create(void);
  SIMAGE_DLL_API s_params * s_params_copy(s_params * params);
  SIMAGE_DLL_API void s_params_destroy(s_params * params);

  SIMAGE_DLL_API void s_params_set(s_params * params, ...);
  SIMAGE_DLL_API int s_params_get(s_params * params, ...);

  /*****************************************************************/
  /**** NOTE: new methods for simage version 1.3 *******************/
  /*****************************************************************/

  /*! Returned image buffer must be freed by simage_free_image() */
  SIMAGE_DLL_API unsigned char * simage_resize3d(unsigned char * imagedata,
                                                 int width, int height,
                                                 int numcomponents,
                                                 int layers,
                                                 int newwidth, int newheight,
                                                 int newlayers);

  /*****************************************************************/
  /**** NOTE: new methods for simage version 1.4 *******************/
  /*****************************************************************/

  typedef struct simage_stream_s s_stream;
  typedef int s_stream_open_func(const char *, s_stream *, s_params *);
  typedef int s_stream_create_func(const char *, s_stream *, s_params *);
  typedef void * s_stream_get_func(s_stream *, void *, int *, s_params *);
  typedef int s_stream_put_func(s_stream *, void *, int, s_params *);
  typedef void s_stream_close_func(s_stream *);

  SIMAGE_DLL_API s_stream * s_stream_open(const char * filename,
                                          s_params * params /* | NULL */);
  SIMAGE_DLL_API s_stream * s_stream_create(const char * filename,
                                            s_params * params /* | NULL */);
  SIMAGE_DLL_API void * s_stream_get_buffer(s_stream * stream,
                                            void * prealloc /* | NULL */,
                                            int *size /* | NULL */,
                                            s_params * params /* | NULL */);
  SIMAGE_DLL_API int s_stream_put_buffer(s_stream * stream, void * buffer,
                                         int size,
                                         s_params * params /* | NULL */);
  SIMAGE_DLL_API void s_stream_close(s_stream * stream);
  SIMAGE_DLL_API void s_stream_destroy(s_stream * stream);
  SIMAGE_DLL_API s_params * s_stream_params(s_stream * stream);

  SIMAGE_DLL_API void s_stream_importer_add(s_stream_open_func * open,
                                            s_stream_get_func * get,
                                            s_stream_close_func * close);

  SIMAGE_DLL_API void s_stream_exporter_add(s_stream_create_func * create,
                                            s_stream_put_func * put,
                                            s_stream_close_func * close);

  /*****************************************************************/
  /**** NOTE: new methods for simage version 1.5 *******************/
  /*****************************************************************/

  typedef int s_stream_seek_func(s_stream *, int, int, s_params *);
  typedef int s_stream_tell_func(s_stream *, s_params *);

  enum {
    SIMAGE_SEEK_SET = 0,
    SIMAGE_SEEK_CUR = 1,
    SIMAGE_SEEK_END = 2
  };


  SIMAGE_DLL_API int s_stream_seek(s_stream * stream, int offset, int whence,
                                   s_params * params /* | NULL */);
  SIMAGE_DLL_API int s_stream_tell(s_stream *stream,
                                   s_params * params /* | NULL */);

  SIMAGE_DLL_API void s_stream_importer_add_ex(s_stream_open_func * open,
                                               s_stream_get_func * get,
                                               s_stream_seek_func * seek,
                                               s_stream_tell_func * tell,
                                               s_stream_close_func * close);

  SIMAGE_DLL_API void s_stream_exporter_add_ex(s_stream_create_func * create,
                                               s_stream_put_func * put,
                                               s_stream_seek_func * seek,
                                               s_stream_tell_func * tell,
                                               s_stream_close_func * close);

  enum {
    SIMAGE_ORDER_RGB = 0,
    SIMAGE_ORDER_BGR
  };
  SIMAGE_DLL_API int s_image_set_component_order(s_image * image, int order);
  SIMAGE_DLL_API int s_image_get_component_order(s_image * image);

  /*****************************************************************/
  /**** NOTE: new methods for simage version 1.6 *******************/
  /*****************************************************************/

  SIMAGE_DLL_API s_image * s_image_open(const char * file, int oktoreadall);
  SIMAGE_DLL_API int s_image_read_line(s_image * image,
                                       int line,
                                       unsigned char * buf);

  typedef void * s_dlopen_func(const char * filename);
  typedef void * s_dlsym_func(void * handle, const char * symbolname);
  typedef void s_dlclose_func(void * handle);

  SIMAGE_DLL_API void s_set_dynamic_loader_interface(s_dlopen_func *dlopen,
                                                     s_dlsym_func *dlsym,
                                                     s_dlclose_func *dlclose);



#ifdef __cplusplus
}
#endif

#endif /* ! SIMAGE_H */
