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box/unbox hooks in C API

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should help us pass C++ objects as args
This commit is contained in:
John Cupitt 2014-10-21 09:27:34 +01:00
parent f2898a8e3b
commit 904803510d
3 changed files with 35 additions and 3 deletions
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9
cplusplus/VImage.cc
View File

@ -70,6 +70,11 @@ void thread_shutdown()
vips_thread_shutdown();
}
// see vips_image_new_from_file()
VImage::VImage( const char *name, ... )
__attribute__((sentinel)) throw( VError )
@ -140,7 +145,7 @@ void VImage::write( const char *name, ... )
va_start( ap, name );
result = vips_call_split_option_string( operation_name, option_string,
ap, image, filename );
ap, this.im, filename );
va_end( ap );
if( result )
@ -165,7 +170,7 @@ void *VImage::write( const char *suffix, size_t *size, ... )
va_start( ap, size );
result = vips_call_split_option_string( operation_name, option_string,
ap, in, &blob );
ap, this.im, &blob );
va_end( ap );
if( result )

14
libvips/include/vips/operation.h
View File

@ -74,6 +74,20 @@ typedef struct _VipsOperation {
*/
int pixels;
/* Get and set functions, used by eg. the C++ interface to box and
* unbox VImage.
*/
/* The value has been read from the VipsOperation and written to the arg
* pointer. @arg is eg. gboolean* for a bool value.
*/
void (*collect_get)( GParamSpec *pspec, void *arg );
/* The value has been read from argv into a GValue. Do any
* boxing/unboxing before the GValue is used to set the property.
*/
void (*collect_set)( GParamSpec *pspec, GValue *value );
} VipsOperation;
typedef struct _VipsOperationClass {

15
libvips/iofuncs/operation.c
View File

@ -603,6 +603,9 @@ vips_operation_set_valist_required( VipsOperation *operation, va_list ap )
}
#endif /*VIPS_DEBUG */
if( operation->collect_set )
operation->collect_set( pspec, &value );
g_object_set_property( G_OBJECT( operation ),
g_param_spec_get_name( pspec ), &value );
@ -645,7 +648,7 @@ vips_operation_get_valist_required( VipsOperation *operation, va_list ap )
/* It'd be nice to be able to test for arg being a
* valid gobject pointer, since passing in a valid
* pointer, and having us destroy it, is a common
* pointer (and having us destroy it) is a common
* error and a cause of hard-to-find leaks.
*
* Unfortunately, G_IS_OBJECT() can't be given an
@ -667,6 +670,11 @@ vips_operation_get_valist_required( VipsOperation *operation, va_list ap )
g_object_unref( object );
}
/* Do any boxing/unboxing.
*/
if( operation->collect_get )
operation->collect_get( pspec, arg );
VIPS_ARGUMENT_COLLECT_END
}
} VIPS_ARGUMENT_FOR_ALL_END
@ -725,6 +733,11 @@ vips_operation_get_valist_optional( VipsOperation *operation, va_list ap )
object = *((GObject **) arg);
g_object_unref( object );
}
/* Do any boxing/unboxing.
*/
if( operation->collect_get )
operation->collect_get( pspec, arg );
}
VIPS_ARGUMENT_COLLECT_END