efl/src/lib/evas/Evas_Loader.h

#ifndef _EVAS_LOADER_H
#define _EVAS_LOADER_H

#include "Eina.h"

/* the module api version */
#define EVAS_MODULE_API_VERSION 2

/* the module types */
typedef enum _Evas_Module_Type
{
   EVAS_MODULE_TYPE_ENGINE = 0,
   EVAS_MODULE_TYPE_IMAGE_LOADER = 1,
   EVAS_MODULE_TYPE_IMAGE_SAVER = 2,
   EVAS_MODULE_TYPE_OBJECT = 3
} Evas_Module_Type;

typedef struct _Evas_Module_Api    Evas_Module_Api;
typedef struct _Evas_Module        Evas_Module;
typedef struct _Evas_Module_Path   Evas_Module_Path;
typedef struct _Evas_Module_Engine Evas_Module_Engine;
typedef struct _Evas_Module_Public Evas_Module_Public;

/* the module api structure, all modules should define this struct */
struct _Evas_Module_Api
{
   int			version;
   const char		*name;
   const char		*author;

   struct
     {
	int (*open)(Evas_Module *);
	void (*close)(Evas_Module *);
     } func;
};

/* the module structure */
struct _Evas_Module
{
   const Evas_Module_Api *definition;

   void		*functions;	/* this are the functions exported by the module */
   int           id_engine;	/* some internal data for the module i.e the id for engines */

   int           ref; /* how many refs */
   int           last_used; /* the cycle count when it was last used */

   Eina_Lock     lock;

   unsigned char	loaded : 1;
};

typedef struct _Evas_Image_Load_Opts Evas_Image_Load_Opts;
typedef struct _Evas_Image_Animated  Evas_Image_Animated;
typedef struct _Evas_Image_Property  Evas_Image_Property;
typedef struct _Evas_Image_Load_Func Evas_Image_Load_Func;

typedef enum _Evas_Load_Error
{
   EVAS_LOAD_ERROR_NONE = 0, /**< No error on load */
   EVAS_LOAD_ERROR_GENERIC = 1, /**< A non-specific error occurred */
   EVAS_LOAD_ERROR_DOES_NOT_EXIST = 2, /**< File (or file path) does not exist */
   EVAS_LOAD_ERROR_PERMISSION_DENIED = 3, /**< Permission denied to an existing file (or path) */
   EVAS_LOAD_ERROR_RESOURCE_ALLOCATION_FAILED = 4, /**< Allocation of resources failure prevented load */
   EVAS_LOAD_ERROR_CORRUPT_FILE = 5, /**< File corrupt (but was detected as a known format) */
   EVAS_LOAD_ERROR_UNKNOWN_FORMAT = 6 /**< File is not a known format */
} Evas_Load_Error; /**< Evas image load error codes one can get - see evas_load_error_str() too. */

typedef enum _Evas_Image_Animated_Loop_Hint
{
   EVAS_IMAGE_ANIMATED_HINT_NONE = 0,
   EVAS_IMAGE_ANIMATED_HINT_LOOP = 1, /**< Image's animation mode is loop like 1->2->3->1->2->3 */
   EVAS_IMAGE_ANIMATED_HINT_PINGPONG = 2 /**< Image's animation mode is pingpong like 1->2->3->2->1-> ... */
} Evas_Image_Animated_Loop_Hint;

typedef enum _Evas_Image_Scale_Hint
{
   EVAS_IMAGE_SCALE_HINT_NONE = 0, /**< No scale hint at all */
   EVAS_IMAGE_SCALE_HINT_DYNAMIC = 1, /**< Image is being re-scaled over time, thus turning scaling cache @b off for its data */
   EVAS_IMAGE_SCALE_HINT_STATIC = 2 /**< Image is not being re-scaled over time, thus turning scaling cache @b on for its data */
} Evas_Image_Scale_Hint; /**< How an image's data is to be treated by Evas, with regard to scaling cache */

struct _Evas_Image_Property
{
   unsigned int  w;
   unsigned int  h;
   
   unsigned char scale;

   Eina_Bool     rotated;
   Eina_Bool     alpha;
   Eina_Bool     premul;
   Eina_Bool     alpha_sparse;
};

struct _Evas_Image_Animated
{
   Eina_List *frames;

   Evas_Image_Animated_Loop_Hint loop_hint;

   int        frame_count;
   int        loop_count;
   int        cur_frame;

   Eina_Bool  animated;
};

struct _Evas_Image_Load_Opts
{
   struct {
      unsigned int      x, y, w, h;
   } region;
   struct {
      int src_x, src_y, src_w, src_h;
      int dst_w, dst_h;
      int smooth;
      Evas_Image_Scale_Hint scale_hint;
   } scale_load;
   double               dpi; // if > 0.0 use this
   unsigned int         w, h; // if > 0 use this
   unsigned int         degree;//if>0 there is some info related with rotation
   int                  scale_down_by; // if > 1 then use this

   Eina_Bool            orientation; // if EINA_TRUE => should honor orientation information provided by file (like jpeg exif info)
};

struct _Evas_Image_Load_Func
{
  void     *(*file_open) (Eina_File *f, Eina_Stringshare *key,
			  Evas_Image_Load_Opts *opts,
			  Evas_Image_Animated *animated,
			  int *error);
  void     (*file_close) (void *loader_data);

  Eina_Bool (*file_head) (void *loader_data,
			  Evas_Image_Property *prop,
			  int *error);
  Eina_Bool (*file_data) (void *loader_data,
			  Evas_Image_Property *prop,
			  void *pixels, int *error);
  double    (*frame_duration) (void *loader_data,
			       int start, int frame_num);

  Eina_Bool threadable;
  Eina_Bool do_region;
};

EAPI Eina_Bool    evas_module_register   (const Evas_Module_Api *module, Evas_Module_Type type);
EAPI Eina_Bool    evas_module_unregister (const Evas_Module_Api *module, Evas_Module_Type type);

#define EVAS_MODULE_DEFINE(Type, Tn, Name)		\
  Eina_Bool evas_##Tn##_##Name##_init(void)		\
  {							\
     return evas_module_register(&evas_modapi, Type);	\
  }							\
  void evas_##Tn##_##Name##_shutdown(void)		\
  {							\
     evas_module_unregister(&evas_modapi, Type);	\
  }

#define EVAS_EINA_MODULE_DEFINE(Tn, Name)	\
  EINA_MODULE_INIT(evas_##Tn##_##Name##_init);	\
  EINA_MODULE_SHUTDOWN(evas_##Tn##_##Name##_shutdown);

#endif