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revise header get/set 

rework header.c

- built-in enum fields, like "interpretation" are handled as enums, not
  ints
- vips_image_get_*() functions always convert to the target type if they
  can
- rename "field" to "name" in the docs
- clarify docs
This commit is contained in:
John Cupitt 2016-10-20 12:41:32 +01:00
parent 0518e290f6
commit ca7b51fb9e
5 changed files with 221 additions and 264 deletions
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1
ChangeLog
View File

@ -2,6 +2,7 @@
- rewritten buffer system is safer and frees memory earlier
- added tiff save to buffer
- added dzsave save to buffer (zip only)
- revise header get/set functions
18/10/16 started 8.4.3
- fix error detection in gif_close, thanks aaron42net

34
libvips/include/vips/header.h
View File

@ -1,4 +1,4 @@
/* boolean.h
/* image header funcs
*
* 20/9/09
* - from proto.h
@ -160,35 +160,35 @@ void vips_image_init_fields( VipsImage *image,
VipsInterpretation interpretation,
double xres, double yres );
void vips_image_set( VipsImage *image, const char *field, GValue *value );
void vips_image_set( VipsImage *image, const char *name, GValue *value );
int vips_image_get( const VipsImage *image,
const char *field, GValue *value_copy );
const char *name, GValue *value_copy );
int vips_image_get_as_string( const VipsImage *image,
const char *field, char **out );
GType vips_image_get_typeof( const VipsImage *image, const char *field );
gboolean vips_image_remove( VipsImage *image, const char *field );
const char *name, char **out );
GType vips_image_get_typeof( const VipsImage *image, const char *name );
gboolean vips_image_remove( VipsImage *image, const char *name );
typedef void *(*VipsImageMapFn)( VipsImage *image,
const char *field, GValue *value, void *a );
const char *name, GValue *value, void *a );
void *vips_image_map( VipsImage *image, VipsImageMapFn fn, void *a );
void vips_image_set_area( VipsImage *image,
const char *field, VipsCallbackFn free_fn, void *data );
const char *name, VipsCallbackFn free_fn, void *data );
int vips_image_get_area( const VipsImage *image,
const char *field, void **data );
void vips_image_set_blob( VipsImage *image, const char *field,
const char *name, void **data );
void vips_image_set_blob( VipsImage *image, const char *name,
VipsCallbackFn free_fn, void *data, size_t length );
int vips_image_get_blob( const VipsImage *image, const char *field,
int vips_image_get_blob( const VipsImage *image, const char *name,
void **data, size_t *length );
int vips_image_get_int( const VipsImage *image, const char *field, int *out );
void vips_image_set_int( VipsImage *image, const char *field, int i );
int vips_image_get_int( const VipsImage *image, const char *name, int *out );
void vips_image_set_int( VipsImage *image, const char *name, int i );
int vips_image_get_double( const VipsImage *image,
const char *field, double *out );
void vips_image_set_double( VipsImage *image, const char *field, double d );
const char *name, double *out );
void vips_image_set_double( VipsImage *image, const char *name, double d );
int vips_image_get_string( const VipsImage *image,
const char *field, const char **out );
const char *name, const char **out );
void vips_image_set_string( VipsImage *image,
const char *field, const char *str );
const char *name, const char *str );
int vips_image_history_printf( VipsImage *image, const char *format, ... )
__attribute__((format(printf, 2, 3)));

2
libvips/include/vips/internal.h
View File

@ -48,7 +48,7 @@ extern "C" {
typedef struct _VipsMeta {
VipsImage *im;
char *field; /* strdup() of field name */
char *name; /* strdup() of field name */
GValue value; /* copy of value */
} VipsMeta;

446
libvips/iofuncs/header.c
View File

@ -22,6 +22,10 @@
* - move to vips_ prefix
* 16/7/15
* - auto wrap GString as RefString
* 20/10/16
* - return header enums as enums, not ints
* - vips_image_get_*() all convert everything to target type if they can
* - rename "field" as "name" in docs
*/
/*
@ -117,53 +121,46 @@
* these types, it can be copied between images efficiently.
*/
/* Name, offset pair.
/* We have to keep the gtype as a string, since we statically init this.
*/
typedef struct _HeaderField {
const char *field;
const char *name;
const char *type;
glong offset;
} HeaderField;
/* Built in fields and struct offsets.
*/
static HeaderField int_field[] = {
{ "width", G_STRUCT_OFFSET( VipsImage, Xsize ) },
{ "height", G_STRUCT_OFFSET( VipsImage, Ysize ) },
{ "bands", G_STRUCT_OFFSET( VipsImage, Bands ) },
{ "format", G_STRUCT_OFFSET( VipsImage, BandFmt ) },
{ "coding", G_STRUCT_OFFSET( VipsImage, Coding ) },
{ "interpretation", G_STRUCT_OFFSET( VipsImage, Type ) },
{ "xoffset", G_STRUCT_OFFSET( VipsImage, Xoffset ) },
{ "yoffset", G_STRUCT_OFFSET( VipsImage, Yoffset ) }
};
static HeaderField double_field[] = {
{ "xres", G_STRUCT_OFFSET( VipsImage, Xres ) },
{ "yres", G_STRUCT_OFFSET( VipsImage, Yres ) }
};
static HeaderField string_field[] = {
{ "filename", G_STRUCT_OFFSET( VipsImage, filename ) }
static HeaderField vips_header_fields[] = {
{ "width", "gint", G_STRUCT_OFFSET( VipsImage, Xsize ) },
{ "height", "gint", G_STRUCT_OFFSET( VipsImage, Ysize ) },
{ "bands", "gint", G_STRUCT_OFFSET( VipsImage, Bands ) },
{ "format", "VipsBandFormat", G_STRUCT_OFFSET( VipsImage, BandFmt ) },
{ "coding", "VipsCoding", G_STRUCT_OFFSET( VipsImage, Coding ) },
{ "interpretation", "VipsInterpretation",
G_STRUCT_OFFSET( VipsImage, Type ) },
{ "xoffset", "gint", G_STRUCT_OFFSET( VipsImage, Xoffset ) },
{ "yoffset", "gint", G_STRUCT_OFFSET( VipsImage, Yoffset ) },
{ "xres", "gdouble", G_STRUCT_OFFSET( VipsImage, Xres ) },
{ "yres", "gdouble", G_STRUCT_OFFSET( VipsImage, Yres ) },
{ "filename", "gchararray", G_STRUCT_OFFSET( VipsImage, filename ) }
};
/* Old names we keep around for back-compat. We never loop over these with
* map, but we do check them when we look up fields by name.
*/
static HeaderField old_int_field[] = {
{ "Xsize", G_STRUCT_OFFSET( VipsImage, Xsize ) },
{ "Ysize", G_STRUCT_OFFSET( VipsImage, Ysize ) },
{ "Bands", G_STRUCT_OFFSET( VipsImage, Bands ) },
{ "Bbits", G_STRUCT_OFFSET( VipsImage, Bbits ) },
{ "BandFmt", G_STRUCT_OFFSET( VipsImage, BandFmt ) },
{ "Coding", G_STRUCT_OFFSET( VipsImage, Coding ) },
{ "Type", G_STRUCT_OFFSET( VipsImage, Type ) },
{ "Xoffset", G_STRUCT_OFFSET( VipsImage, Xoffset ) },
{ "Yoffset", G_STRUCT_OFFSET( VipsImage, Yoffset ) }
};
static HeaderField old_double_field[] = {
{ "Xres", G_STRUCT_OFFSET( VipsImage, Xres ) },
{ "Yres", G_STRUCT_OFFSET( VipsImage, Yres ) }
static HeaderField vips_header_fields_old[] = {
{ "Xsize", "gint", G_STRUCT_OFFSET( VipsImage, Xsize ) },
{ "Ysize", "gint", G_STRUCT_OFFSET( VipsImage, Ysize ) },
{ "Bands", "gint", G_STRUCT_OFFSET( VipsImage, Bands ) },
{ "Bbits", "gint", G_STRUCT_OFFSET( VipsImage, Bbits ) },
{ "BandFmt", "gint", G_STRUCT_OFFSET( VipsImage, BandFmt ) },
{ "Coding", "gint", G_STRUCT_OFFSET( VipsImage, Coding ) },
{ "Type", "gint", G_STRUCT_OFFSET( VipsImage, Type ) },
{ "Xoffset", "gint", G_STRUCT_OFFSET( VipsImage, Xoffset ) },
{ "Yoffset", "gint", G_STRUCT_OFFSET( VipsImage, Yoffset ) },
{ "Xres", "gdouble", G_STRUCT_OFFSET( VipsImage, Xres ) },
{ "Yres", "gdouble", G_STRUCT_OFFSET( VipsImage, Yres ) }
};
/* This is used by (eg.) VIPS_IMAGE_SIZEOF_ELEMENT() to calculate object
@ -228,33 +225,33 @@ meta_sanity_on_hash( VipsMeta *meta, VipsImage *im )
if( meta->im != im )
printf( "*** field \"%s\" has incorrect im\n",
meta->field );
meta->name );
if( !(found = g_hash_table_lookup( im->meta, meta->field )) )
if( !(found = g_hash_table_lookup( im->meta, meta->name )) )
printf( "*** field \"%s\" is on traverse but not in hash\n",
meta->field );
meta->name );
if( found != meta )
printf( "*** meta \"%s\" on traverse and hash do not match\n",
meta->field );
meta->name );
return( NULL );
}
static void
meta_sanity_on_traverse( const char *field, VipsMeta *meta, VipsImage *im )
meta_sanity_on_traverse( const char *name, VipsMeta *meta, VipsImage *im )
{
if( meta->field != field )
printf( "*** field \"%s\" has incorrect field\n",
meta->field );
if( meta->name != name )
printf( "*** field \"%s\" has incorrect name\n",
meta->name );
if( meta->im != im )
printf( "*** field \"%s\" has incorrect im\n",
meta->field );
meta->name );
if( !g_slist_find( im->meta_traverse, meta ) )
printf( "*** field \"%s\" is in hash but not on traverse\n",
meta->field );
meta->name );
}
static void
@ -276,8 +273,8 @@ meta_free( VipsMeta *meta )
char *str_value;
str_value = g_strdup_value_contents( &meta->value );
printf( "meta_free: field %s, value = %s\n",
meta->field, str_value );
printf( "meta_free: name %s, value = %s\n",
meta->name, str_value );
g_free( str_value );
}
#endif /*DEBUG*/
@ -287,20 +284,20 @@ meta_free( VipsMeta *meta )
g_slist_remove( meta->im->meta_traverse, meta );
g_value_unset( &meta->value );
g_free( meta->field );
g_free( meta->name );
g_free( meta );
}
static VipsMeta *
meta_new( VipsImage *image, const char *field, GValue *value )
meta_new( VipsImage *image, const char *name, GValue *value )
{
VipsMeta *meta;
meta = g_new( VipsMeta, 1 );
meta->im = image;
meta->field = NULL;
meta->name = NULL;
memset( &meta->value, 0, sizeof( GValue ) );
meta->field = g_strdup( field );
meta->name = g_strdup( name );
/* Special case: we don't want to have G_STRING on meta. They will be
* copied down pipelines, plus some of our API (like
@ -319,15 +316,14 @@ meta_new( VipsImage *image, const char *field, GValue *value )
(void) g_value_transform( value, &meta->value );
image->meta_traverse = g_slist_append( image->meta_traverse, meta );
g_hash_table_replace( image->meta, meta->field, meta );
g_hash_table_replace( image->meta, meta->name, meta );
#ifdef DEBUG
{
char *str_value;
str_value = g_strdup_value_contents( value );
printf( "meta_new: field %s, value = %s\n",
field, str_value );
printf( "meta_new: name %s, value = %s\n", name, str_value );
g_free( str_value );
}
#endif /*DEBUG*/
@ -832,13 +828,13 @@ meta_cp_field( VipsMeta *meta, VipsImage *dst )
char *str_value;
str_value = g_strdup_value_contents( &meta->value );
printf( "vips__meta_cp: copying field %s, value = %s\n",
meta->field, str_value );
printf( "vips__meta_cp: copying name %s, value = %s\n",
meta->name, str_value );
g_free( str_value );
}
#endif /*DEBUG*/
(void) meta_new( dst, meta->field, &meta->value );
(void) meta_new( dst, meta->name, &meta->value );
#ifdef DEBUG
meta_sanity( dst );
@ -915,7 +911,7 @@ vips__image_copy_fields_array( VipsImage *out, VipsImage *in[] )
/**
* vips_image_set:
* @image: image to set the metadata on
* @field: the name to give the metadata
* @name: the name to give the metadata
* @value: the %GValue to copy into the image
*
* Set a piece of metadata on @image. Any old metadata with that name is
@ -930,30 +926,58 @@ vips__image_copy_fields_array( VipsImage *out, VipsImage *in[] )
*
* g_value_init (&value, G_TYPE_INT);
* g_value_set_int (&value, 42);
* vips_image_set (image, field, &value);
* vips_image_set (image, name, &value);
* g_value_unset (&value);
* ]|
*
* See also: vips_image_get().
*/
void
vips_image_set( VipsImage *image, const char *field, GValue *value )
vips_image_set( VipsImage *image, const char *name, GValue *value )
{
g_assert( field );
g_assert( name );
g_assert( value );
meta_init( image );
(void) meta_new( image, field, value );
(void) meta_new( image, name, value );
#ifdef DEBUG
meta_sanity( image );
#endif /*DEBUG*/
}
/* Unforunately gvalue seems to have no way of doing this. Just handle the vips
* built-in types.
*/
static void
vips_set_value_from_pointer( GValue *value, void *data )
{
GType type = G_VALUE_TYPE( value );
/* The fundamental type ... eg. G_TYPE_ENUM for a VIPS_TYPE_KERNEL,
* or G_TYPE_OBJECT for VIPS_TYPE_IMAGE().
*/
GType fundamental = G_TYPE_FUNDAMENTAL( type );
if( fundamental == G_TYPE_INT )
g_value_set_int( value, *((int *) data) );
else if( fundamental == G_TYPE_DOUBLE )
g_value_set_double( value, *((double *) data) );
else if( fundamental == G_TYPE_ENUM )
g_value_set_enum( value, *((int *) data) );
else if( fundamental == G_TYPE_STRING )
g_value_set_string( value, ((char *) data) );
else
g_warning( "%s: unimplemented vips_set_value_from_pointer() "
"type %s",
G_STRLOC,
g_type_name( type ) );
}
/**
* vips_image_get:
* @image: image to get the field from from
* @field: the name to give the metadata
* @name: the name to fetch
* @value_copy: (transfer full) (out caller-allocates): the %GValue is copied into this
*
* Fill @value_copy with a copy of the header field. @value_copy must be zeroed
@ -970,13 +994,13 @@ vips_image_set( VipsImage *image, const char *field, GValue *value )
* GValue value = { 0 };
* double d;
*
* if (vips_image_get (image, field, &value))
* if (vips_image_get (image, name, &value))
* return -1;
*
* if (G_VALUE_TYPE (&value) != G_TYPE_DOUBLE) {
* vips_error( "mydomain",
* _("field \"%s\" is of type %s, not double"),
* field,
* name,
* g_type_name (G_VALUE_TYPE (&value)));
* g_value_unset (&value);
* return -1;
@ -991,68 +1015,49 @@ vips_image_set( VipsImage *image, const char *field, GValue *value )
* Returns: (skip): 0 on success, -1 otherwise.
*/
int
vips_image_get( const VipsImage *image, const char *field, GValue *value_copy )
vips_image_get( const VipsImage *image, const char *name, GValue *value_copy )
{
int i;
VipsMeta *meta;
g_assert( field );
g_assert( name );
g_assert( value_copy );
for( i = 0; i < VIPS_NUMBER( int_field ); i++ )
if( strcmp( field, int_field[i].field ) == 0 ) {
g_value_init( value_copy, G_TYPE_INT );
g_value_set_int( value_copy,
G_STRUCT_MEMBER( int, image,
int_field[i].offset ) );
return( 0 );
}
for( i = 0; i < VIPS_NUMBER( vips_header_fields ); i++ ) {
HeaderField *field = &vips_header_fields[i];
for( i = 0; i < VIPS_NUMBER( old_int_field ); i++ )
if( strcmp( field, old_int_field[i].field ) == 0 ) {
g_value_init( value_copy, G_TYPE_INT );
g_value_set_int( value_copy,
G_STRUCT_MEMBER( int, image,
old_int_field[i].offset ) );
return( 0 );
}
if( strcmp( field->name, name ) == 0 ) {
GType gtype = g_type_from_name( field->type );
for( i = 0; i < VIPS_NUMBER( double_field ); i++ )
if( strcmp( field, double_field[i].field ) == 0 ) {
g_value_init( value_copy, G_TYPE_DOUBLE );
g_value_set_double( value_copy,
G_STRUCT_MEMBER( double, image,
double_field[i].offset ) );
g_value_init( value_copy, gtype );
vips_set_value_from_pointer( value_copy,
G_STRUCT_MEMBER_P( image, field->offset ) );
return( 0 );
}
}
for( i = 0; i < VIPS_NUMBER( old_double_field ); i++ )
if( strcmp( field, old_double_field[i].field ) == 0 ) {
g_value_init( value_copy, G_TYPE_DOUBLE );
g_value_set_double( value_copy,
G_STRUCT_MEMBER( double, image,
old_double_field[i].offset ) );
return( 0 );
}
for( i = 0; i < VIPS_NUMBER( vips_header_fields_old ); i++ ) {
HeaderField *field = &vips_header_fields_old[i];
for( i = 0; i < VIPS_NUMBER( string_field ); i++ )
if( strcmp( field, string_field[i].field ) == 0 ) {
g_value_init( value_copy, G_TYPE_STRING );
g_value_set_static_string( value_copy,
G_STRUCT_MEMBER( char *, image,
string_field[i].offset ) );
if( strcmp( field->name, name ) == 0 ) {
GType gtype = g_type_from_name( field->type );
g_value_init( value_copy, gtype );
vips_set_value_from_pointer( value_copy,
G_STRUCT_MEMBER_P( image, field->offset ) );
return( 0 );
}
}
if( image->meta &&
(meta = g_hash_table_lookup( image->meta, field )) ) {
(meta = g_hash_table_lookup( image->meta, name )) ) {
g_value_init( value_copy, G_VALUE_TYPE( &meta->value ) );
g_value_copy( &meta->value, value_copy );
return( 0 );
}
vips_error( "vips_image_get", _( "field \"%s\" not found" ), field );
vips_error( "vips_image_get", _( "field \"%s\" not found" ), name );
return( -1 );
}
@ -1060,7 +1065,7 @@ vips_image_get( const VipsImage *image, const char *field, GValue *value_copy )
/**
* vips_image_get_typeof:
* @image: image to test
* @field: the name to search for
* @name: the name to search for
*
* Read the %GType for a header field. Returns zero if there is no
* field of that name.
@ -1071,34 +1076,32 @@ vips_image_get( const VipsImage *image, const char *field, GValue *value_copy )
* field of that name.
*/
GType
vips_image_get_typeof( const VipsImage *image, const char *field )
vips_image_get_typeof( const VipsImage *image, const char *name )
{
int i;
VipsMeta *meta;
g_assert( field );
g_assert( name );
for( i = 0; i < VIPS_NUMBER( int_field ); i++ )
if( strcmp( field, int_field[i].field ) == 0 )
return( G_TYPE_INT );
for( i = 0; i < VIPS_NUMBER( old_int_field ); i++ )
if( strcmp( field, old_int_field[i].field ) == 0 )
return( G_TYPE_INT );
for( i = 0; i < VIPS_NUMBER( double_field ); i++ )
if( strcmp( field, double_field[i].field ) == 0 )
return( G_TYPE_DOUBLE );
for( i = 0; i < VIPS_NUMBER( old_double_field ); i++ )
if( strcmp( field, old_double_field[i].field ) == 0 )
return( G_TYPE_DOUBLE );
for( i = 0; i < VIPS_NUMBER( string_field ); i++ )
if( strcmp( field, string_field[i].field ) == 0 )
return( G_TYPE_STRING );
for( i = 0; i < VIPS_NUMBER( vips_header_fields ); i++ ) {
HeaderField *field = &vips_header_fields[i];
if( strcmp( field->name, name ) == 0 )
return( g_type_from_name( field->type ) );
}
for( i = 0; i < VIPS_NUMBER( vips_header_fields_old ); i++ ) {
HeaderField *field = &vips_header_fields_old[i];
if( strcmp( field->name, name ) == 0 )
return( g_type_from_name( field->type ) );
}
if( image->meta &&
(meta = g_hash_table_lookup( image->meta, field )) )
(meta = g_hash_table_lookup( image->meta, name )) )
return( G_VALUE_TYPE( &meta->value ) );
VIPS_DEBUG_MSG( "vips_image_get_typeof: unknown field %s\n", field );
VIPS_DEBUG_MSG( "vips_image_get_typeof: unknown field %s\n", name );
return( 0 );
}
@ -1106,7 +1109,7 @@ vips_image_get_typeof( const VipsImage *image, const char *field )
/**
* vips_image_remove:
* @image: image to test
* @field: the name to search for
* @name: the name to search for
*
* Find and remove an item of metadata. Return %FALSE if no metadata of that
* name was found.
@ -1116,10 +1119,10 @@ vips_image_get_typeof( const VipsImage *image, const char *field )
* Returns: %TRUE if an item of metadata of that name was found and removed
*/
gboolean
vips_image_remove( VipsImage *image, const char *field )
vips_image_remove( VipsImage *image, const char *name )
{
if( image->meta &&
g_hash_table_remove( image->meta, field ) )
g_hash_table_remove( image->meta, name ) )
return( TRUE );
return( FALSE );
@ -1128,7 +1131,7 @@ vips_image_remove( VipsImage *image, const char *field )
static void *
vips_image_map_fn( VipsMeta *meta, VipsImageMapFn fn, void *a )
{
return( fn( meta->im, meta->field, &meta->value, a ) );
return( fn( meta->im, meta->name, &meta->value, a ) );
}
/**
@ -1154,27 +1157,11 @@ vips_image_map( VipsImage *image, VipsImageMapFn fn, void *a )
GValue value = { 0 };
void *result;
for( i = 0; i < VIPS_NUMBER( int_field ); i++ ) {
vips_image_get( image, int_field[i].field, &value );
result = fn( image, int_field[i].field, &value, a );
g_value_unset( &value );
for( i = 0; i < VIPS_NUMBER( vips_header_fields ); i++ ) {
HeaderField *field = &vips_header_fields[i];
if( result )
return( result );
}
for( i = 0; i < VIPS_NUMBER( double_field ); i++ ) {
vips_image_get( image, double_field[i].field, &value );
result = fn( image, double_field[i].field, &value, a );
g_value_unset( &value );
if( result )
return( result );
}
for( i = 0; i < VIPS_NUMBER( string_field ); i++ ) {
vips_image_get( image, string_field[i].field, &value );
result = fn( image, string_field[i].field, &value, a );
vips_image_get( image, field->name, &value );
result = fn( image, field->name, &value, a );
g_value_unset( &value );
if( result )
@ -1192,39 +1179,39 @@ vips_image_map( VipsImage *image, VipsImageMapFn fn, void *a )
/**
* vips_image_set_area:
* @image: image to attach the metadata to
* @field: metadata name
* @name: metadata name
* @free_fn: (scope async): free function for @data
* @data: pointer to area of memory
*
* Attaches @data as a metadata item on @image under the name @field. When
* Attaches @data as a metadata item on @image under the name @name. When
* VIPS no longer needs the metadata, it will be freed with @free_fn.
*
* See also: vips_image_get_double(), vips_image_set()
*/
void
vips_image_set_area( VipsImage *image, const char *field,
VipsCallbackFn free_fn, void *data )
vips_image_set_area( VipsImage *image, const char *name,
VipsCallbackFn free_fn, void *data )
{
GValue value = { 0 };
vips_value_set_area( &value, free_fn, data );
vips_image_set( image, field, &value );
vips_image_set( image, name, &value );
g_value_unset( &value );
}
static int
meta_get_value( const VipsImage *image,
const char *field, GType type, GValue *value_copy )
const char *name, GType type, GValue *value_copy )
{
GValue value = { 0 };
if( vips_image_get( image, field, &value ) )
if( vips_image_get( image, name, &value ) )
return( -1 );
g_value_init( value_copy, type );
if( !g_value_transform( &value, value_copy ) ) {
vips_error( "VipsImage",
_( "field \"%s\" is of type %s, not %s" ),
field,
name,
g_type_name( G_VALUE_TYPE( &value ) ),
g_type_name( type ) );
g_value_unset( &value );
@ -1239,10 +1226,10 @@ meta_get_value( const VipsImage *image,
/**
* vips_image_get_area:
* @image: image to get the metadata from
* @field: metadata name
* @name: metadata name
* @data: return metadata value
*
* Gets @data from @image under the name @field. A convenience
* Gets @data from @image under the name @name. A convenience
* function over vips_image_get(). Use vips_image_get_typeof() to test for
* the existance of a piece of metadata.
*
@ -1252,11 +1239,11 @@ meta_get_value( const VipsImage *image,
* Returns: 0 on success, -1 otherwise.
*/
int
vips_image_get_area( const VipsImage *image, const char *field, void **data )
vips_image_get_area( const VipsImage *image, const char *name, void **data )
{
GValue value_copy = { 0 };
if( !meta_get_value( image, field, VIPS_TYPE_AREA, &value_copy ) ) {
if( !meta_get_value( image, name, VIPS_TYPE_AREA, &value_copy ) ) {
*data = vips_value_get_area( &value_copy, NULL );
g_value_unset( &value_copy );
return( 0 );
@ -1268,37 +1255,37 @@ vips_image_get_area( const VipsImage *image, const char *field, void **data )
/**
* vips_image_set_blob:
* @image: image to attach the metadata to
* @field: metadata name
* @name: metadata name
* @free_fn: (scope async): free function for @data
* @data: pointer to area of memory
* @length: length of memory area
*
* Attaches @blob as a metadata item on @image under the name @field. A
* Attaches @blob as a metadata item on @image under the name @name. A
* convenience
* function over vips_image_set() using an vips_blob.
*
* See also: vips_image_get_blob(), vips_image_set().
*/
void
vips_image_set_blob( VipsImage *image, const char *field,
vips_image_set_blob( VipsImage *image, const char *name,
VipsCallbackFn free_fn, void *data, size_t length )
{
GValue value = { 0 };
g_value_init( &value, VIPS_TYPE_BLOB );
vips_value_set_blob( &value, free_fn, data, length );
vips_image_set( image, field, &value );
vips_image_set( image, name, &value );
g_value_unset( &value );
}
/**
* vips_image_get_blob:
* @image: image to get the metadata from
* @field: metadata name
* @name: metadata name
* @data: pointer to area of memory
* @length: return the blob length here, optionally
*
* Gets @blob from @image under the name @field, optionally return its length in
* Gets @blob from @image under the name @name, optionally returns its length in
* @length. A convenience
* function over vips_image_get(). Use vips_image_get_typeof() to test for the
* existance
@ -1309,12 +1296,12 @@ vips_image_set_blob( VipsImage *image, const char *field,
* Returns: 0 on success, -1 otherwise.
*/
int
vips_image_get_blob( const VipsImage *image, const char *field,
vips_image_get_blob( const VipsImage *image, const char *name,
void **data, size_t *length )
{
GValue value_copy = { 0 };
if( !meta_get_value( image, field, VIPS_TYPE_BLOB, &value_copy ) ) {
if( !meta_get_value( image, name, VIPS_TYPE_BLOB, &value_copy ) ) {
*data = vips_value_get_blob( &value_copy, length );
g_value_unset( &value_copy );
return( 0 );
@ -1326,43 +1313,28 @@ vips_image_get_blob( const VipsImage *image, const char *field,
/**
* vips_image_get_int:
* @image: image to get the header field from
* @field: field name
* @name: field name
* @out: return field value
*
* Gets @out from @im under the name @field. This function searches for
* int-valued fields.
* Gets @out from @im under the name @name.
* The value will be transformed into
* an int, if possible.
*
* See also: vips_image_get(), vips_image_get_typeof()
*
* Returns: 0 on success, -1 otherwise.
*/
int
vips_image_get_int( const VipsImage *image, const char *field, int *out )
vips_image_get_int( const VipsImage *image, const char *name, int *out )
{
int i;
GValue value_copy = { 0 };
GValue value = { 0 };
for( i = 0; i < VIPS_NUMBER( int_field ); i++ )
if( strcmp( field, int_field[i].field ) == 0 ) {
*out = G_STRUCT_MEMBER( int, image,
int_field[i].offset );
return( 0 );
}
for( i = 0; i < VIPS_NUMBER( old_int_field ); i++ )
if( strcmp( field, old_int_field[i].field ) == 0 ) {
*out = G_STRUCT_MEMBER( int, image,
old_int_field[i].offset );
return( 0 );
}
if( meta_get_value( image, name, G_TYPE_INT, &value ) )
return( -1 );
*out = g_value_get_int( &value );
g_value_unset( &value );
if( !meta_get_value( image, field, G_TYPE_INT, &value_copy ) ) {
*out = g_value_get_int( &value_copy );
g_value_unset( &value_copy );
return( 0 );
}
return( -1 );
return( 0 );
}
/**
@ -1391,45 +1363,28 @@ vips_image_set_int( VipsImage *image, const char *field, int i )
/**
* vips_image_get_double:
* @image: image to get the header field from
* @field: field name
* @name: field name
* @out: return field value
*
* Gets @out from @im under the name @field.
* This function searches for
* double-valued fields.
* Gets @out from @im under the name @name.
* The value will be transformed into
* a double, if possible.
*
* See also: vips_image_get(), vips_image_get_typeof()
*
* Returns: 0 on success, -1 otherwise.
*/
int
vips_image_get_double( const VipsImage *image, const char *field, double *out )
vips_image_get_double( const VipsImage *image, const char *name, double *out )
{
int i;
GValue value_copy = { 0 };
GValue value = { 0 };
for( i = 0; i < VIPS_NUMBER( double_field ); i++ )
if( strcmp( field, double_field[i].field ) == 0 ) {
*out = G_STRUCT_MEMBER( double, image,
double_field[i].offset );
return( 0 );
}
for( i = 0; i < VIPS_NUMBER( old_double_field ); i++ )
if( strcmp( field, old_double_field[i].field ) == 0 ) {
*out = G_STRUCT_MEMBER( double, image,
old_double_field[i].offset );
return( 0 );
}
if( meta_get_value( image, name, G_TYPE_DOUBLE, &value ) )
return( -1 );
*out = g_value_get_double( &value );
g_value_unset( &value );
if( !meta_get_value( image, field, G_TYPE_DOUBLE, &value_copy ) ) {
*out = g_value_get_double( &value_copy );
g_value_unset( &value_copy );
return( 0 );
}
return( -1 );
return( 0 );
}
/**
@ -1458,43 +1413,44 @@ vips_image_set_double( VipsImage *image, const char *field, double d )
/**
* vips_image_get_string:
* @image: image to get the header field from
* @field: field name
* @out: return field value
* @name: field name
* @out: (transfer none): return field value
*
* Gets @out from @im under the name @field.
* This function searches for string-valued fields.
* Gets @out from @im under the name @name.
* The field must be of type
* VIPS_TYPE_REFSTRING.
*
* Do not free @out.
*
* Use vips_image_get_as_string() to fetch any field as a string.
*
* See also: vips_image_get(), vips_image_get_typeof()
*
* Returns: 0 on success, -1 otherwise.
*/
int
vips_image_get_string( const VipsImage *image, const char *field,
vips_image_get_string( const VipsImage *image, const char *name,
const char **out )
{
int i;
GValue value_copy = { 0 };
GValue value = { 0 };
VipsArea *area;
for( i = 0; i < VIPS_NUMBER( string_field ); i++ )
if( strcmp( field, string_field[i].field ) == 0 ) {
*out = G_STRUCT_MEMBER( char *, image,
string_field[i].offset );
return( 0 );
}
if( !meta_get_value( image,
field, VIPS_TYPE_REF_STRING, &value_copy ) ) {
area = g_value_get_boxed( &value_copy );
*out = area->data;
g_value_unset( &value_copy );
return( 0 );
if( vips_image_get( image, name, &value ) )
return( -1 );
if( G_VALUE_TYPE( &value ) != VIPS_TYPE_REF_STRING ) {
vips_error( "VipsImage",
_( "field \"%s\" is of type %s, not VipsRefString" ),
name,
g_type_name( G_VALUE_TYPE( &value ) ) );
g_value_unset( &value );
return( -1 );
}
return( -1 );
area = g_value_get_boxed( &value );
*out = area->data;
g_value_unset( &value );
return( 0 );
}
/**

2
libvips/iofuncs/vips.c
View File

@ -760,7 +760,7 @@ save_fields_meta( VipsMeta *meta, xmlNode *node )
_( "error transforming to save format" ) );
return( node );
}
if( set_field( node, meta->field, g_type_name( type ),
if( set_field( node, meta->name, g_type_name( type ),
vips_value_get_save_string( &save_value ) ) ) {
g_value_unset( &save_value );
return( node );