Abstract Base Class For All Plainware Objects

* abstract base class for all Plainware objects
*/
/*
    Copyright (C) 1991-2003 The National Gallery
    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.
 */
/*
    These files are distributed with VIPS – http://www.vips.ecs.soton.ac.uk
 */
#ifndef VIPS_OBJECT_H
#define VIPS_OBJECT_H
#ifdef __cplusplus
extern “C” {
#endif /*__cplusplus*/
/* Handy!
*/
#ifdef VIPS_DEBUG
#define VIPS_UNREF( X ) G_STMT_START { \
if( X ) { \
g_assert( G_OBJECT( X )->ref_count > 0 ); \
g_object_unref( X ); \
(X) = 0; \
} \
} G_STMT_END
#else /*!VIPS_DEBUG*/
#define VIPS_UNREF( X ) VIPS_FREEF( g_object_unref, (X) )
#endif /*VIPS_DEBUG*/
typedef struct _VipsObject VipsObject;
typedef struct _VipsObjectClass VipsObjectClass;
/* Track extra stuff for arguments to objects
*/
typedef enum /*< flags >*/ {
VIPS_ARGUMENT_NONE = 0,
VIPS_ARGUMENT_REQUIRED = 1,
VIPS_ARGUMENT_CONSTRUCT = 2,
VIPS_ARGUMENT_SET_ONCE = 4,
VIPS_ARGUMENT_SET_ALWAYS = 8,
VIPS_ARGUMENT_INPUT = 16,
VIPS_ARGUMENT_OUTPUT = 32,
VIPS_ARGUMENT_DEPRECATED = 64,
VIPS_ARGUMENT_MODIFY = 128
} VipsArgumentFlags;
/* Useful flag combinations. User-visible ones are:
VIPS_ARGUMENT_REQUIRED_INPUT  Eg. the “left” argument for an add operation
VIPS_ARGUMENT_OPTIONAL_INPUT  Eg. the “caption” for an object
VIPS_ARGUMENT_REQUIRED_OUTPUT   Eg. the “result” of an add operation
VIPS_ARGUMENT_OPTIONAL_OUTPUT   Eg. the x pos of the image minimum
   Other combinations are used internally, eg. supplying the cast-table for an
arithmetic operation
 */
#define VIPS_ARGUMENT_REQUIRED_INPUT \
(VIPS_ARGUMENT_INPUT | \
VIPS_ARGUMENT_REQUIRED | \
VIPS_ARGUMENT_CONSTRUCT)
#define VIPS_ARGUMENT_OPTIONAL_INPUT \
(VIPS_ARGUMENT_INPUT | \
VIPS_ARGUMENT_CONSTRUCT)
#define VIPS_ARGUMENT_REQUIRED_OUTPUT \
(VIPS_ARGUMENT_OUTPUT | \
VIPS_ARGUMENT_REQUIRED | \
VIPS_ARGUMENT_CONSTRUCT)
#define VIPS_ARGUMENT_OPTIONAL_OUTPUT \
(VIPS_ARGUMENT_OUTPUT | \
VIPS_ARGUMENT_CONSTRUCT)
extern int _vips__argument_id;
#define VIPS_ARG_IMAGE( CLASS, NAME, PRIORITY, LONG, DESC, FLAGS, OFFSET ) { \
GParamSpec *pspec; \
\
pspec = g_param_spec_object( (NAME), (LONG), (DESC),  \
VIPS_TYPE_IMAGE, \
(GParamFlags) (G_PARAM_READWRITE) ); \
g_object_class_install_property( G_OBJECT_CLASS( CLASS ), \
_vips__argument_id++, pspec ); \
vips_object_class_install_argument( VIPS_OBJECT_CLASS( CLASS ), \
pspec, (VipsArgumentFlags) (FLAGS), (PRIORITY), (OFFSET) ); \
}
#define VIPS_ARG_INTERPOLATE( CLASS, NAME, PRIORITY, LONG, DESC, FLAGS, OFFSET ) { \
GParamSpec *pspec; \
\
pspec = g_param_spec_object( (NAME), (LONG), (DESC),  \
VIPS_TYPE_INTERPOLATE, \
(GParamFlags) (G_PARAM_READWRITE) ); \
g_object_class_install_property( G_OBJECT_CLASS( CLASS ), \
_vips__argument_id++, pspec ); \
vips_object_class_install_argument( VIPS_OBJECT_CLASS( CLASS ), \
pspec, (VipsArgumentFlags) (FLAGS), (PRIORITY), (OFFSET) ); \
}
#define VIPS_ARG_BOOL( CLASS, NAME, PRIORITY, LONG, DESC, \
FLAGS, OFFSET, VALUE ) { \
GParamSpec *pspec; \
\
pspec = g_param_spec_boolean( (NAME), (LONG), (DESC), \
(VALUE), \
(GParamFlags) (G_PARAM_READWRITE) ); \
g_object_class_install_property( G_OBJECT_CLASS( CLASS ), \
_vips__argument_id++, pspec ); \
vips_object_class_install_argument( VIPS_OBJECT_CLASS( CLASS ), \
pspec, (VipsArgumentFlags) (FLAGS), (PRIORITY), (OFFSET) ); \
}
#define VIPS_ARG_DOUBLE( CLASS, NAME, PRIORITY, LONG, DESC, \
FLAGS, OFFSET, MIN, MAX, VALUE ) { \
GParamSpec *pspec; \
\
pspec = g_param_spec_double( (NAME), (LONG), (DESC), \
(MIN), (MAX), (VALUE), \
(GParamFlags) (G_PARAM_READWRITE) );\
g_object_class_install_property( G_OBJECT_CLASS( CLASS ), \
_vips__argument_id++, pspec ); \
vips_object_class_install_argument( VIPS_OBJECT_CLASS( CLASS ), \
pspec, (VipsArgumentFlags) (FLAGS), (PRIORITY), (OFFSET) ); \
}
#define VIPS_ARG_BOXED( CLASS, NAME, PRIORITY, LONG, DESC, \
FLAGS, OFFSET, TYPE ) { \
GParamSpec *pspec; \
\
pspec = g_param_spec_boxed( (NAME), (LONG), (DESC), \
(TYPE), \
(GParamFlags) (G_PARAM_READWRITE) );\
g_object_class_install_property( G_OBJECT_CLASS( CLASS ), \
_vips__argument_id++, pspec ); \
vips_object_class_install_argument( VIPS_OBJECT_CLASS( CLASS ), \
pspec, (VipsArgumentFlags) (FLAGS), (PRIORITY), (OFFSET) ); \
}
#define VIPS_ARG_INT( CLASS, NAME, PRIORITY, LONG, DESC, \
FLAGS, OFFSET, MIN, MAX, VALUE ) { \
GParamSpec *pspec; \
\
pspec = g_param_spec_int( (NAME), (LONG), (DESC), \
(MIN), (MAX), (VALUE), \
(GParamFlags) (G_PARAM_READWRITE) );\
g_object_class_install_property( G_OBJECT_CLASS( CLASS ), \
_vips__argument_id++, pspec ); \
vips_object_class_install_argument( VIPS_OBJECT_CLASS( CLASS ), \
pspec, (VipsArgumentFlags) (FLAGS), (PRIORITY), (OFFSET) ); \
}
#define VIPS_ARG_UINT64( CLASS, NAME, PRIORITY, LONG, DESC, \
FLAGS, OFFSET, MIN, MAX, VALUE ) { \
GParamSpec *pspec; \
\
pspec = g_param_spec_uint64( (NAME), (LONG), (DESC), \
(MIN), (MAX), (VALUE), \
(GParamFlags) (G_PARAM_READWRITE) );\
g_object_class_install_property( G_OBJECT_CLASS( CLASS ), \
_vips__argument_id++, pspec ); \
vips_object_class_install_argument( VIPS_OBJECT_CLASS( CLASS ), \
pspec, (VipsArgumentFlags) (FLAGS), (PRIORITY), (OFFSET) ); \
}
#define VIPS_ARG_ENUM( CLASS, NAME, PRIORITY, LONG, DESC, \
FLAGS, OFFSET, TYPE, VALUE ) { \
GParamSpec *pspec; \
\
pspec = g_param_spec_enum( (NAME), (LONG), (DESC), \
(TYPE), (VALUE), \
(GParamFlags) (G_PARAM_READWRITE) );\
g_object_class_install_property( G_OBJECT_CLASS( CLASS ), \
_vips__argument_id++, pspec ); \
vips_object_class_install_argument( VIPS_OBJECT_CLASS( CLASS ), \
pspec, (VipsArgumentFlags) (FLAGS), (PRIORITY), (OFFSET) ); \
}
#define VIPS_ARG_FLAGS( CLASS, NAME, PRIORITY, LONG, DESC, \
FLAGS, OFFSET, TYPE, VALUE ) { \
GParamSpec *pspec; \
\
pspec = g_param_spec_flags( (NAME), (LONG), (DESC), \
(TYPE), (VALUE), \
(GParamFlags) (G_PARAM_READWRITE) );\
g_object_class_install_property( G_OBJECT_CLASS( CLASS ), \
_vips__argument_id++, pspec ); \
vips_object_class_install_argument( VIPS_OBJECT_CLASS( CLASS ), \
pspec, (VipsArgumentFlags) (FLAGS), (PRIORITY), (OFFSET) ); \
}
#define VIPS_ARG_STRING( CLASS, NAME, PRIORITY, LONG, DESC, FLAGS, OFFSET, \
VALUE ) { \
GParamSpec *pspec; \
\
pspec = g_param_spec_string( (NAME), (LONG), (DESC), \
(VALUE), \
(GParamFlags) (G_PARAM_READWRITE) ); \
g_object_class_install_property( G_OBJECT_CLASS( CLASS ), \
_vips__argument_id++, pspec ); \
vips_object_class_install_argument( VIPS_OBJECT_CLASS( CLASS ), \
pspec, (VipsArgumentFlags) (FLAGS), (PRIORITY), (OFFSET) ); \
}
#define VIPS_ARG_POINTER( CLASS, NAME, PRIORITY, LONG, DESC, FLAGS, OFFSET ) { \
GParamSpec *pspec; \
\
pspec = g_param_spec_pointer( (NAME), (LONG), (DESC), \
(GParamFlags) (G_PARAM_READWRITE) ); \
g_object_class_install_property( gobject_class,  \
_vips__argument_id++, pspec ); \
vips_object_class_install_argument( VIPS_OBJECT_CLASS( CLASS ), \
pspec, (VipsArgumentFlags) (FLAGS), (PRIORITY), (OFFSET) ); \
}
/* Keep one of these for every argument.
*/
typedef struct _VipsArgument {
GParamSpec *pspec; /* pspec for this argument */
 /* More stuff, see below */
} VipsArgument;
/* Keep one of these in the class struct for every argument.
*/
typedef struct _VipsArgumentClass {
VipsArgument parent;
 /* The class of the object we are an arg for.
*/
VipsObjectClass *object_class;
 VipsArgumentFlags flags;
int priority;  /* Order args by this */
guint offset;  /* G_STRUCT_OFFSET of member in object */
} VipsArgumentClass;
/* Keep one of these in the object struct for every argument instance.
*/
typedef struct _VipsArgumentInstance {
VipsArgument parent;
 /* The class we are part of.
*/
VipsArgumentClass *argument_class;
 /* The object we are attached to.
*/
VipsObject *object;
 /* Has been set.
*/
gboolean assigned;
 /* If this is an output argument, keep the id of our “close” handler
* here.
*/
gulong close_id; 
 /* We need to listen for “invalidate” on input images and send our own
* “invalidate” out. If we go, we need to disconnect.
*/
gulong invalidate_id;
} VipsArgumentInstance;
/* Need to look up our VipsArgument structs from a pspec. Just hash the
* pointer (ie. we assume pspecs are never shared, is this correct?)
*/
typedef GHashTable VipsArgumentTable;
void vips__object_set_member( VipsObject *object, GParamSpec *pspec,
GObject **member, GObject *argument );
typedef void *(*VipsArgumentMapFn)( VipsObject *object, GParamSpec *pspec,
VipsArgumentClass *argument_class,
VipsArgumentInstance *argument_instance, void *a, void *b );
void *vips_argument_map( VipsObject *object,
VipsArgumentMapFn fn, void *a, void *b );
typedef void *(*VipsArgumentClassMapFn)( VipsObjectClass *object_class,
GParamSpec *pspec,
VipsArgumentClass *argument_class, void *a, void *b );
void *vips_argument_class_map( VipsObjectClass *object_class,
VipsArgumentClassMapFn fn, void *a, void *b );
gboolean vips_argument_class_needsstring( VipsArgumentClass *argument_class );
int vips_object_get_argument( VipsObject *object, const char *name,
GParamSpec **pspec,
VipsArgumentClass **argument_class,
VipsArgumentInstance **argument_instance );
gboolean vips_object_argument_isset( VipsObject *object, const char *name );
VipsArgumentFlags vips_object_get_argument_flags( VipsObject *object,
const char *name );
int vips_object_get_argument_priority( VipsObject *object, const char *name );
/* We have to loop over an objects args in several places, and we can’t always
* use vips_argument_map(), the preferred looper. Have the loop code as a
* macro as well for these odd cases.
*/
#define VIPS_ARGUMENT_FOR_ALL( OBJECT, PSPEC, ARG_CLASS, ARG_INSTANCE ) { \
VipsObjectClass *object_class = VIPS_OBJECT_GET_CLASS( OBJECT ); \
GSList *p; \
\
for( p = object_class->argument_table_traverse; p; p = p->next ) { \
VipsArgumentClass *ARG_CLASS = \
(VipsArgumentClass *) p->data; \
VipsArgument *argument = (VipsArgument *) argument_class; \
GParamSpec *PSPEC = argument->pspec; \
VipsArgumentInstance *ARG_INSTANCE __attribute__ ((unused)) = \
vips__argument_get_instance( argument_class, \
VIPS_OBJECT( OBJECT ) ); \
#define VIPS_ARGUMENT_FOR_ALL_END } }
/* And some macros to collect args from a va list.
*
* Use something like this:
 GParamSpec *pspec;
VipsArgumentClass *argument_class;
VipsArgumentInstance *argument_instance;
 if( vips_object_get_argument( VIPS_OBJECT( operation ), name,
&pspec, &argument_class, &argument_instance ) )
return( -1 );
 VIPS_ARGUMENT_COLLECT_SET( pspec, argument_class, ap );
  GValue value holds the value of an input argument, do
something with it
 VIPS_ARGUMENT_COLLECT_GET( pspec, argument_class, ap );
  void **arg points to where to write an output argument
 VIPS_ARGUMENT_COLLECT_END

*/
#define VIPS_ARGUMENT_COLLECT_SET( PSPEC, ARG_CLASS, AP ) \
if( (ARG_CLASS->flags & VIPS_ARGUMENT_INPUT) ) { \
GValue value = { 0, }; \
gchar *error = NULL; \
\
/* Input args are given inline, eg. (“factor”, 12.0)  \
* and must be collected. \
*/ \
g_value_init( &value, G_PARAM_SPEC_VALUE_TYPE( PSPEC ) ); \
G_VALUE_COLLECT( &value, AP, 0, &error ); \
\
/* Don’t bother with the error message. \
*/ \
if( error ) { \
VIPS_DEBUG_MSG( “VIPS_OBJECT_COLLECT_SET: err\n” ); \
g_free( error ); \
}

#define VIPS_ARGUMENT_COLLECT_GET( PSPEC, ARG_CLASS, AP ) \
g_value_unset( &value ); \
} \
else if( (ARG_CLASS->flags & VIPS_ARGUMENT_OUTPUT) ) { \
void **arg __attribute__ ((unused)); \
\
/* Output args are a pointer to where to send the \
* result. \
*/ \
arg = va_arg( AP, void ** );
#define VIPS_ARGUMENT_COLLECT_END \
}
#define VIPS_TYPE_OBJECT (vips_object_get_type())
#define VIPS_OBJECT( obj ) \
(G_TYPE_CHECK_INSTANCE_CAST( (obj), VIPS_TYPE_OBJECT, VipsObject ))
#define VIPS_OBJECT_CLASS( klass ) \
(G_TYPE_CHECK_CLASS_CAST( (klass), VIPS_TYPE_OBJECT, VipsObjectClass))
#define VIPS_IS_OBJECT( obj ) \
(G_TYPE_CHECK_INSTANCE_TYPE( (obj), VIPS_TYPE_OBJECT ))
#define VIPS_IS_OBJECT_CLASS( klass ) \
(G_TYPE_CHECK_CLASS_TYPE( (klass), VIPS_TYPE_OBJECT ))
#define VIPS_OBJECT_GET_CLASS( obj ) \
(G_TYPE_INSTANCE_GET_CLASS( (obj), VIPS_TYPE_OBJECT, VipsObjectClass ))
struct _VipsObject {
GObject parent_instance;
 /* Set after ->build() has run succesfully: construct is fully done
* and checked.
*/
gboolean constructed;
 /* Set for static objects which are allocated at startup and never
* freed. These objects are ommitted from leak reports.
*/
gboolean static_object;
 /* Table of argument instances for this class and any derived classes.
*/
VipsArgumentTable *argument_table;
 /* Class properties (see below), duplicated in the instance so we can
* get at them easily via the property system.
*/
char *nickname;
char *description;
 /* The pre/post/close callbacks are all fire-once.
*/
gboolean preclose;
gboolean close;
gboolean postclose;
 /* Total memory allocated relative to this object, handy for
* profiling.
*/
size_t local_memory;
};
struct _VipsObjectClass {
GObjectClass parent_class;
 /* Build the object … all argument properties have been set,
* now build the thing.
*/
int (*build)( VipsObject *object );
 /* Just after build … the object is fully ready for work.
*/
int (*postbuild)( VipsObject *object );
 /* Try to print something about the class, handy for help displays.
* Keep to one line.
*/
void (*summary_class)( struct _VipsObjectClass *cls, VipsBuf *buf );
 /* Try to print a one-line summary for the object, the user can see
* this output via things like “header fred.tif”, –vips-cache-trace,
* etc.
*/
void (*summary)( VipsObject *object, VipsBuf *buf );
 /* Try to print everything about the object, handy for debugging.
*/
void (*dump)( VipsObject *object, VipsBuf *buf );
 /* Sanity-check the object. Print messages and stuff.
* Handy for debugging.
*/
void (*sanity)( VipsObject *object, VipsBuf *buf );
 /* Rewind. Save and restore any stuff that needs to survive a
* dispose().
*/
void (*rewind)( VipsObject *object );
 /* Just before close, everything is still alive.
*/
void (*preclose)( VipsObject *object );
 /* Close, time to free stuff.
*/
void (*close)( VipsObject *object );
 /* Post-close, everything is dead, except the VipsObject pointer.
* Useful for eg. deleting the file associated with a temp image.
*/
void (*postclose)( VipsObject *object );
 /* The CLI interface. Implement these four to get CLI input and output
* for your object.
*/
 /* Given a command-line arg (eg. a filename), make an instance of the
* object. Just do the g_object_new(), don’t call _build().
*
* Don’t call this directly, see vips_object_new_from_string().
*/
VipsObject *(*new_from_string)( const char *string );
 /* The inverse of ^^. Given an object, output what ->new_from_string()
* would have been given to make that object.
*/
void (*to_string)( VipsObject *object, VipsBuf *buf );
 /* Does this output arg need an arg from the command line? Image
* output, for example, needs a filename to write to.
*/
gboolean output_needs_arg;
 /* Write the object to the string. Return 0 for success, or -1 on
* error, setting vips_error(). string is NULL if output_needs_arg()
* was FALSE.
*/
int (*output_to_arg)( VipsObject *object, const char *string );
 /* Class nickname, eg. “VipsInterpolateBicubic” has “bicubic” as a
* nickname. Not internationalised.
*/
const char *nickname;
 /* Class description. Used for help messages, so internationalised.
*/
const char *description;
 /* Hash from pspec to VipsArgumentClass.
*
* This records the VipsArgumentClass for every pspec used in
* VipsObject and any subclass (ie. everywhere), so it’s huge. Don’t
* loop over this hash! Fine for lookups though.
*/
VipsArgumentTable *argument_table;
 /* A sorted (by priority) list of the VipsArgumentClass for this class
* and any superclasses. This is small and specific to this class.
*
* Use the stored GType to work out when to restart the list for a
* subclass.
*/
GSList *argument_table_traverse;
GType argument_table_traverse_gtype;
 /* This class is deprecated and therefore hidden from various UI bits.
*
* VipsOperation has a deprecated flag, use that in preference to this
* if you can.
*/
gboolean deprecated;
 /* Reserved for future expansion.
*/
void (*_vips_reserved1)( void );
void (*_vips_reserved2)( void );
void (*_vips_reserved3)( void );
void (*_vips_reserved4)( void );
};
gboolean vips_value_is_null( GParamSpec *psoec, const GValue *value );
void vips_object_set_property( GObject *gobject,
guint property_id, const GValue *value, GParamSpec *pspec );
void vips_object_get_property( GObject *gobject,
guint property_id, GValue *value, GParamSpec *pspec );
void vips_object_preclose( VipsObject *object );
int vips_object_build( VipsObject *object );
void vips_object_summary_class( VipsObjectClass *klass, VipsBuf *buf );
void vips_object_summary( VipsObject *object, VipsBuf *buf );
void vips_object_dump( VipsObject *object, VipsBuf *buf );
void vips_object_print_summary_class( VipsObjectClass *klass );
void vips_object_print_summary( VipsObject *object );
void vips_object_print_dump( VipsObject *object );
void vips_object_print_name( VipsObject *object );
gboolean vips_object_sanity( VipsObject *object );
/* Don’t put spaces around void here, it breaks gtk-doc.
*/
GType vips_object_get_type(void);
void vips_object_class_install_argument( VipsObjectClass *cls,
GParamSpec *pspec, VipsArgumentFlags flags,
int priority, guint offset );
int vips_object_set_argument_from_string( VipsObject *object,
const char *name, const char *value );
gboolean vips_object_argument_needsstring( VipsObject *object,
const char *name );
int vips_object_get_argument_to_string( VipsObject *object,
const char *name, const char *arg );
int vips_object_set_required( VipsObject *object, const char *value );
typedef void *(*VipsObjectSetArguments)( VipsObject *object, void *a, void *b );
VipsObject *vips_object_new( GType type,
VipsObjectSetArguments set, void *a, void *b );
int vips_object_set_valist( VipsObject *object, va_list ap );
int vips_object_set( VipsObject *object, … )
__attribute__((sentinel));
int vips_object_set_from_string( VipsObject *object, const char *string );
VipsObject *vips_object_new_from_string( VipsObjectClass *object_class,
const char *p );
void vips_object_to_string( VipsObject *object, VipsBuf *buf );
void *vips_object_map( VipsSListMap2Fn fn, void *a, void *b );
typedef void *(*VipsTypeMapFn)( GType type, void *a );
typedef void *(*VipsTypeMap2Fn)( GType type, void *a, void *b );
typedef void *(*VipsClassMapFn)( VipsObjectClass *cls, void *a );
void *vips_type_map( GType base, VipsTypeMap2Fn fn, void *a, void *b );
void *vips_type_map_all( GType base, VipsTypeMapFn fn, void *a );
int vips_type_depth( GType type );
GType vips_type_find( const char *basename, const char *nickname );
const char *vips_nickname_find( GType type );
void *vips_class_map_all( GType type, VipsClassMapFn fn, void *a );
const VipsObjectClass *vips_class_find( const char *basename,
const char *nickname );
VipsObject **vips_object_local_array( VipsObject *parent, int n );
void vips_object_local_cb( VipsObject *vobject, GObject *gobject );
#define vips_object_local( V, G ) \
(g_signal_connect( V, “close”, G_CALLBACK( vips_object_local_cb ), G ))
void vips_object_set_static( VipsObject *object, gboolean static_object );
void vips_object_print_all( void );
void vips_object_sanity_all( void );
void vips_object_rewind( VipsObject *object );
void vips_object_unref_outputs( VipsObject *object );
const char *vips_object_get_description( VipsObject *object );
#ifdef __cplusplus
}
#endif /*__cplusplus*/
#endif /*VIPS_OBJECT_H*/

Published by Michael Jones

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