turn on seq mode automatically in cli

cli operations turn on seq mode automatically when they can

vips_operation_get_flags() added: lets you attach a set of flags to an
operation

flags for now are "nocache" (replacing the old nocache system) and "seqential"

if vips_object_set_argument_from_string() from string sees "seq" flag on the
object for which it is setting the arg, it enables sequential mode

all operations which can run sequentially have been tagged

the operation printer knows about flags and can display them

ChangeLog

@@ -12,6 +12,11 @@
 - better thread safety for vips8 operation dispatch
 - better thread safety for upstream / downstream image linking
 - added "rs" open mode, removed "rd"
+- added vips_operation_get_flags() ... system for attaching sets of flags to
+  operations
+- added VIPS_OPERATION_SEQUENTIAL flag
+- vips8 command-line interface uses this to turn sequential mode on
+  automatically when possible
 
 18/6/12 started 7.28.9
 - slightly more memory debugging output

TODO

@@ -1,4 +1,3 @@
-
 - test "rs" mode
 
   can't see the code for "rd" mode?

libvips/arithmetic/arithmetic.c

@@ -370,6 +370,7 @@ vips_arithmetic_class_init( VipsArithmeticClass *class )
 {
 	GObjectClass *gobject_class = G_OBJECT_CLASS( class );
 	VipsObjectClass *vobject_class = VIPS_OBJECT_CLASS( class );
+	VipsOperationClass *operation_class = VIPS_OPERATION_CLASS( class );
 
 	gobject_class->set_property = vips_object_set_property;
 	gobject_class->get_property = vips_object_get_property;
@@ -378,6 +379,8 @@ vips_arithmetic_class_init( VipsArithmeticClass *class )
 	vobject_class->description = _( "arithmetic operations" );
 	vobject_class->build = vips_arithmetic_build;
 
+	operation_class->flags = VIPS_OPERATION_SEQUENTIAL;
+
 	VIPS_ARG_IMAGE( class, "out", 100, 
 		_( "Output" ), 
 		_( "Output image" ),

libvips/conversion/bandary.c

@@ -163,6 +163,7 @@ vips_bandary_class_init( VipsBandaryClass *class )
 {
 	GObjectClass *gobject_class = G_OBJECT_CLASS( class );
 	VipsObjectClass *vobject_class = VIPS_OBJECT_CLASS( class );
+	VipsOperationClass *operation_class = VIPS_OPERATION_CLASS( class );
 
 	VIPS_DEBUG_MSG( "vips_bandary_class_init\n" );
 
@@ -173,6 +174,7 @@ vips_bandary_class_init( VipsBandaryClass *class )
 	vobject_class->description = _( "operations on image bands" );
 	vobject_class->build = vips_bandary_build;
 
+	operation_class->flags = VIPS_OPERATION_SEQUENTIAL;
 }
 
 static void

libvips/conversion/cast.c

@@ -462,6 +462,7 @@ vips_cast_class_init( VipsCastClass *class )
 {
 	GObjectClass *gobject_class = G_OBJECT_CLASS( class );
 	VipsObjectClass *vobject_class = VIPS_OBJECT_CLASS( class );
+	VipsOperationClass *operation_class = VIPS_OPERATION_CLASS( class );
 
 	VIPS_DEBUG_MSG( "vips_cast_class_init\n" );
 
@@ -472,6 +473,8 @@ vips_cast_class_init( VipsCastClass *class )
 	vobject_class->description = _( "cast an image" );
 	vobject_class->build = vips_cast_build;
 
+	operation_class->flags = VIPS_OPERATION_SEQUENTIAL;
+
 	VIPS_ARG_IMAGE( class, "in", 1, 
 		_( "Input" ), 
 		_( "Input image" ),

libvips/conversion/copy.c

@@ -304,6 +304,7 @@ vips_copy_class_init( VipsCopyClass *class )
 {
 	GObjectClass *gobject_class = G_OBJECT_CLASS( class );
 	VipsObjectClass *vobject_class = VIPS_OBJECT_CLASS( class );
+	VipsOperationClass *operation_class = VIPS_OPERATION_CLASS( class );
 
 	VIPS_DEBUG_MSG( "vips_copy_class_init\n" );
 
@@ -314,6 +315,8 @@ vips_copy_class_init( VipsCopyClass *class )
 	vobject_class->description = _( "copy an image" );
 	vobject_class->build = vips_copy_build;
 
+	operation_class->flags = VIPS_OPERATION_SEQUENTIAL;
+
 	VIPS_ARG_IMAGE( class, "in", 1, 
 		_( "Input" ), 
 		_( "Input image" ),

libvips/conversion/embed.c

@@ -507,6 +507,7 @@ vips_embed_class_init( VipsEmbedClass *class )
 {
 	GObjectClass *gobject_class = G_OBJECT_CLASS( class );
 	VipsObjectClass *vobject_class = VIPS_OBJECT_CLASS( class );
+	VipsOperationClass *operation_class = VIPS_OPERATION_CLASS( class );
 
 	VIPS_DEBUG_MSG( "vips_embed_class_init\n" );
 
@@ -517,6 +518,8 @@ vips_embed_class_init( VipsEmbedClass *class )
 	vobject_class->description = _( "embed an image in a larger image" );
 	vobject_class->build = vips_embed_build;
 
+	operation_class->flags = VIPS_OPERATION_SEQUENTIAL;
+
 	VIPS_ARG_IMAGE( class, "in", -1, 
 		_( "Input" ), 
 		_( "Input image" ),

libvips/conversion/extract.c

@@ -180,6 +180,7 @@ vips_extract_area_class_init( VipsExtractAreaClass *class )
 {
 	GObjectClass *gobject_class = G_OBJECT_CLASS( class );
 	VipsObjectClass *vobject_class = VIPS_OBJECT_CLASS( class );
+	VipsOperationClass *operation_class = VIPS_OPERATION_CLASS( class );
 
 	VIPS_DEBUG_MSG( "vips_extract_area_class_init\n" );
 
@@ -190,6 +191,8 @@ vips_extract_area_class_init( VipsExtractAreaClass *class )
 	vobject_class->description = _( "extract an area from an image" );
 	vobject_class->build = vips_extract_area_build;
 
+	operation_class->flags = VIPS_OPERATION_SEQUENTIAL;
+
 	VIPS_ARG_IMAGE( class, "input", 0, 
 		_( "Input" ), 
 		_( "Input image" ),

libvips/conversion/flatten.c

@@ -358,6 +358,7 @@ vips_flatten_class_init( VipsFlattenClass *class )
 {
 	GObjectClass *gobject_class = G_OBJECT_CLASS( class );
 	VipsObjectClass *vobject_class = VIPS_OBJECT_CLASS( class );
+	VipsOperationClass *operation_class = VIPS_OPERATION_CLASS( class );
 
 	VIPS_DEBUG_MSG( "vips_flatten_class_init\n" );
 
@@ -368,6 +369,8 @@ vips_flatten_class_init( VipsFlattenClass *class )
 	vobject_class->description = _( "flatten alpha out of an image" );
 	vobject_class->build = vips_flatten_build;
 
+	operation_class->flags = VIPS_OPERATION_SEQUENTIAL;
+
 	VIPS_ARG_IMAGE( class, "in", 1, 
 		_( "Input" ), 
 		_( "Input image" ),

libvips/conversion/ifthenelse.c

@@ -458,6 +458,7 @@ vips_ifthenelse_class_init( VipsIfthenelseClass *class )
 {
 	GObjectClass *gobject_class = G_OBJECT_CLASS( class );
 	VipsObjectClass *vobject_class = VIPS_OBJECT_CLASS( class );
+	VipsOperationClass *operation_class = VIPS_OPERATION_CLASS( class );
 
 	VIPS_DEBUG_MSG( "vips_ifthenelse_class_init\n" );
 
@@ -468,6 +469,8 @@ vips_ifthenelse_class_init( VipsIfthenelseClass *class )
 	vobject_class->description = _( "ifthenelse an image" );
 	vobject_class->build = vips_ifthenelse_build;
 
+	operation_class->flags = VIPS_OPERATION_SEQUENTIAL;
+
 	VIPS_ARG_IMAGE( class, "cond", -2, 
 		_( "Condition" ), 
 		_( "Condition input image" ),

libvips/conversion/insert.c

@@ -339,6 +339,7 @@ vips_insert_class_init( VipsInsertClass *class )
 {
 	GObjectClass *gobject_class = G_OBJECT_CLASS( class );
 	VipsObjectClass *vobject_class = VIPS_OBJECT_CLASS( class );
+	VipsOperationClass *operation_class = VIPS_OPERATION_CLASS( class );
 
 	VIPS_DEBUG_MSG( "vips_insert_class_init\n" );
 
@@ -349,6 +350,8 @@ vips_insert_class_init( VipsInsertClass *class )
 	vobject_class->description = _( "insert an image" );
 	vobject_class->build = vips_insert_build;
 
+	operation_class->flags = VIPS_OPERATION_SEQUENTIAL;
+
 	VIPS_ARG_IMAGE( class, "main", -1, 
 		_( "Main" ), 
 		_( "Main input image" ),

libvips/conversion/join.c

@@ -200,6 +200,7 @@ vips_join_class_init( VipsJoinClass *class )
 {
 	GObjectClass *gobject_class = G_OBJECT_CLASS( class );
 	VipsObjectClass *vobject_class = VIPS_OBJECT_CLASS( class );
+	VipsOperationClass *operation_class = VIPS_OPERATION_CLASS( class );
 
 	VIPS_DEBUG_MSG( "vips_join_class_init\n" );
 
@@ -210,6 +211,8 @@ vips_join_class_init( VipsJoinClass *class )
 	vobject_class->description = _( "join a pair of images" );
 	vobject_class->build = vips_join_build;
 
+	operation_class->flags = VIPS_OPERATION_SEQUENTIAL;
+
 	VIPS_ARG_IMAGE( class, "in1", -1, 
 		_( "in1" ), 
 		_( "First input image" ),

libvips/conversion/recomb.c

@@ -188,6 +188,7 @@ vips_recomb_class_init( VipsRecombClass *class )
 {
 	GObjectClass *gobject_class = G_OBJECT_CLASS( class );
 	VipsObjectClass *object_class = (VipsObjectClass *) class;
+	VipsOperationClass *operation_class = VIPS_OPERATION_CLASS( class );
 
 	gobject_class->set_property = vips_object_set_property;
 	gobject_class->get_property = vips_object_get_property;
@@ -196,6 +197,8 @@ vips_recomb_class_init( VipsRecombClass *class )
 	object_class->description = _( "linear recombination with matrix" );
 	object_class->build = vips_recomb_build;
 
+	operation_class->flags = VIPS_OPERATION_SEQUENTIAL;
+
 	VIPS_ARG_IMAGE( class, "in", 0, 
 		_( "Input" ), 
 		_( "Input image argument" ),

libvips/foreign/foreign.c

@@ -702,7 +702,7 @@ vips_foreign_load_temp( VipsForeignLoad *load )
 
 		/* You can't reuse sequential operations.
 		 */
-		vips_operation_set_nocache( VIPS_OPERATION( load ), TRUE );
+		load->nocache = TRUE;
 
 		return( vips_image_new() );
 	}
@@ -889,11 +889,26 @@ vips_foreign_load_build( VipsObject *object )
 	return( 0 );
 }
 
+static VipsOperationFlags 
+vips_foreign_load_real_get_flags( VipsOperation *operation )
+{
+	VipsForeignLoad *load = VIPS_FOREIGN_LOAD( operation );
+	VipsOperationFlags flags;
+
+	flags = VIPS_OPERATION_CLASS( vips_foreign_load_parent_class )->
+		get_flags( operation );
+	if( load->nocache )
+		flags |= VIPS_OPERATION_NOCACHE;
+
+	return( flags );
+}
+
 static void
 vips_foreign_load_class_init( VipsForeignLoadClass *class )
 {
 	GObjectClass *gobject_class = G_OBJECT_CLASS( class );
 	VipsObjectClass *object_class = (VipsObjectClass *) class;
+	VipsOperationClass *operation_class = (VipsOperationClass *) class;
 
 	gobject_class->dispose = vips_foreign_load_dispose;
 	gobject_class->set_property = vips_object_set_property;
@@ -905,6 +920,8 @@ vips_foreign_load_class_init( VipsForeignLoadClass *class )
 	object_class->nickname = "fileload";
 	object_class->description = _( "file loaders" );
 
+	operation_class->get_flags = vips_foreign_load_real_get_flags;
+
 	VIPS_ARG_IMAGE( class, "out", 2, 
 		_( "Output" ), 
 		_( "Output image" ),

libvips/include/vips/Makefile.am

@@ -63,6 +63,7 @@ vips_scan_headers = \
 	${top_srcdir}/libvips/include/vips/conversion.h \
 	${top_srcdir}/libvips/include/vips/util.h \
 	${top_srcdir}/libvips/include/vips/image.h \
+	${top_srcdir}/libvips/include/vips/operation.h \
 	${top_srcdir}/libvips/include/vips/object.h
 
 enumtypes.h: $(vips_scan_headers) Makefile

libvips/include/vips/enumtypes.h

@@ -57,6 +57,9 @@ GType vips_band_format_get_type (void) G_GNUC_CONST;
 #define VIPS_TYPE_BAND_FORMAT (vips_band_format_get_type())
 GType vips_coding_get_type (void) G_GNUC_CONST;
 #define VIPS_TYPE_CODING (vips_coding_get_type())
+/* enumerations from "../../../libvips/include/vips/operation.h" */
+GType vips_operation_flags_get_type (void) G_GNUC_CONST;
+#define VIPS_TYPE_OPERATION_FLAGS (vips_operation_flags_get_type())
 /* enumerations from "../../../libvips/include/vips/object.h" */
 GType vips_argument_flags_get_type (void) G_GNUC_CONST;
 #define VIPS_TYPE_ARGUMENT_FLAGS (vips_argument_flags_get_type())

libvips/include/vips/foreign.h

@@ -136,6 +136,10 @@ typedef struct _VipsForeignLoad {
 	 * disc foreign or a memory buffer. This must be set by ->load().
 	 */
 	VipsImage *real;
+
+	/* Set this to tag the operation as nocache.
+	 */
+	gboolean nocache;
 } VipsForeignLoad;
 
 typedef struct _VipsForeignLoadClass {

libvips/include/vips/operation.h

@@ -36,6 +36,27 @@ extern "C" {
 
 #include <vips/vips.h>
 
+/** 
+ * VipsOperationFlags:
+ * @VIPS_OPERATION_NONE: no flags
+ * @VIPS_OPERATION_SEQUENTIAL: can work sequentially
+ * @VIPS_OPERATION_NOCACHE: must not be cached
+ *
+ * Flags we associate with an operation.
+ *
+ * @VIPS_OPERATION_SEQUENTIAL means that the operation works like vips_copy:
+ * it can happily process images top-to-bottom with only small non-local
+ * references.
+ *
+ * @VIPS_OPERATION_NOCACHE means that the operation must not be cached by
+ * vips. 
+ */
+typedef enum /*< flags >*/ {
+	VIPS_OPERATION_NONE = 0,
+	VIPS_OPERATION_SEQUENTIAL = 1,
+	VIPS_OPERATION_NOCACHE = 2
+} VipsOperationFlags;
+
 #define VIPS_TYPE_OPERATION (vips_operation_get_type())
 #define VIPS_OPERATION( obj ) \
 	(G_TYPE_CHECK_INSTANCE_CAST( (obj), \
@@ -66,12 +87,6 @@ typedef struct _VipsOperation {
 	guint hash;
 	gboolean found_hash;
 
-	/* Set this before the end of _build() to stop this operation from 
-	 * being cached. Some things, like sequential read from a TIFF file, 
-	 * can't be reused.
-	 */
-	gboolean nocache;
-
 } VipsOperation;
 
 typedef struct _VipsOperationClass {
@@ -80,10 +95,17 @@ typedef struct _VipsOperationClass {
 	/* Print the usage message.
 	 */
 	void (*usage)( struct _VipsOperationClass *, VipsBuf * );
+
+	/* Return a set of operation flags. If @get_flags is NULL, just use
+	 * flags.
+	 */
+	VipsOperationFlags (*get_flags)( VipsOperation * ); 
+	VipsOperationFlags flags;
 } VipsOperationClass;
 
 GType vips_operation_get_type( void );
 
+VipsOperationFlags vips_operation_get_flags( VipsOperation *operation );
 void vips_operation_class_print_usage( VipsOperationClass *operation_class );
 
 int vips_operation_call_valist( VipsOperation *operation, va_list ap );
@@ -96,7 +118,6 @@ void vips_call_options( GOptionGroup *group, VipsOperation *operation );
 int vips_call_argv( VipsOperation *operation, int argc, char **argv );
 
 void vips_cache_drop_all( void );
-void vips_operation_set_nocache( VipsOperation *operation, gboolean nocache );
 int vips_cache_operation_buildp( VipsOperation **operation );
 VipsOperation *vips_cache_operation_build( VipsOperation *operation );
 void vips_cache_print( void );

libvips/iofuncs/Makefile.am

@@ -46,6 +46,7 @@ vips_scan_headers = \
 	${top_srcdir}/libvips/include/vips/arithmetic.h \
 	${top_srcdir}/libvips/include/vips/util.h \
 	${top_srcdir}/libvips/include/vips/image.h \
+	${top_srcdir}/libvips/include/vips/operation.h \
 	${top_srcdir}/libvips/include/vips/object.h
 
 enumtypes.c: $(vips_scan_headers) Makefile

libvips/iofuncs/cache.c

@@ -693,7 +693,8 @@ vips_cache_operation_buildp( VipsOperation **operation )
 
 	if( !hit ) {
 		if( vips__cache_trace ) {
-			if( (*operation)->nocache ) 
+			if( vips_operation_get_flags( *operation ) & 
+				VIPS_OPERATION_NOCACHE )
 				printf( "vips cache: uncacheable %p\n  ", 
 					*operation );
 			else
@@ -706,7 +707,8 @@ vips_cache_operation_buildp( VipsOperation **operation )
 
 		g_mutex_lock( vips_cache_lock );
 
-		if( !(*operation)->nocache ) {
+		if( !(vips_operation_get_flags( *operation ) & 
+			VIPS_OPERATION_NOCACHE) ) {
 			vips_cache_ref( *operation );
 			g_hash_table_insert( vips_cache_table, 
 				*operation, *operation );

libvips/iofuncs/enumtypes.c

@@ -492,6 +492,25 @@ vips_coding_get_type( void )
 
 	return( etype );
 }
+/* enumerations from "../../libvips/include/vips/operation.h" */
+GType
+vips_operation_flags_get_type( void )
+{
+	static GType etype = 0;
+
+	if( etype == 0 ) {
+		static const GFlagsValue values[] = {
+			{VIPS_OPERATION_NONE, "VIPS_OPERATION_NONE", "none"},
+			{VIPS_OPERATION_SEQUENTIAL, "VIPS_OPERATION_SEQUENTIAL", "sequential"},
+			{VIPS_OPERATION_NOCACHE, "VIPS_OPERATION_NOCACHE", "nocache"},
+			{0, NULL, NULL}
+		};
+		
+		etype = g_flags_register_static( "VipsOperationFlags", values );
+	}
+
+	return( etype );
+}
 /* enumerations from "../../libvips/include/vips/object.h" */
 GType
 vips_argument_flags_get_type( void )

libvips/iofuncs/object.c

@@ -1466,12 +1466,27 @@ vips_object_set_argument_from_string( VipsObject *object,
 
 	if( g_type_is_a( otype, VIPS_TYPE_IMAGE ) ) { 
 		VipsImage *out;
+		VipsOperationFlags flags;
+
+		flags = 0;
+		if( VIPS_IS_OPERATION( object ) )
+			flags = vips_operation_get_flags( 
+				VIPS_OPERATION( object ) );
 
 		/* Read the filename. vips_foreign_load_options()
 		 * handles embedded options.
 		 */
-		if( vips_foreign_load_options( value, &out, NULL ) )
-			return( -1 );
+		if( flags & VIPS_OPERATION_SEQUENTIAL ) {
+			if( vips_foreign_load_options( value, &out, 
+				"sequential", TRUE,
+				NULL ) )
+				return( -1 );
+		}
+		else {
+			if( vips_foreign_load_options( value, &out, 
+				NULL ) )
+				return( -1 );
+		}
 
 		g_value_init( &gvalue, VIPS_TYPE_IMAGE );
 		g_value_set_object( &gvalue, out );

libvips/iofuncs/operation.c

@@ -148,6 +148,24 @@ vips_operation_usage( VipsOperationClass *class, VipsBuf *buf )
 	vips_argument_class_map( object_class,
 		(VipsArgumentClassMapFn) vips_operation_class_usage_arg, 
 			buf, &usage );
+
+	/* Show flags.
+	 */
+	if( class->flags ) {
+		GFlagsValue *value;
+		VipsOperationFlags flags;
+		GFlagsClass *flags_class = 
+			g_type_class_ref( VIPS_TYPE_OPERATION_FLAGS );
+
+		vips_buf_appendf( buf, "operation flags: " );
+		flags = class->flags; 
+		while( flags && (value = 
+			g_flags_get_first_value( flags_class, flags )) ) {
+			vips_buf_appendf( buf, "%s ", value->value_nick );
+			flags &= ~value->value;
+		}
+		vips_buf_appends( buf, "\n" );
+	}
 }
 
 static void *
@@ -233,6 +251,14 @@ vips_operation_summary( VipsObject *object, VipsBuf *buf )
 		summary( object, buf );
 }
 
+static VipsOperationFlags
+vips_operation_real_get_flags( VipsOperation *operation ) 
+{
+	VipsOperationClass *class = VIPS_OPERATION_GET_CLASS( operation );
+
+	return( class->flags );
+}
+
 static void
 vips_operation_class_init( VipsOperationClass *class )
 {
@@ -248,6 +274,7 @@ vips_operation_class_init( VipsOperationClass *class )
 	vobject_class->dump = vips_operation_dump;
 
 	class->usage = vips_operation_usage;
+	class->get_flags = vips_operation_real_get_flags;
 }
 
 static void
@@ -257,6 +284,22 @@ vips_operation_init( VipsOperation *operation )
 	 */
 }
 
+/**
+ * vips_operation_get_flags:
+ * @operation: operation to fetch flags from
+ *
+ * Returns the set of flags for this operation.
+ *
+ * Returns: 0 on success, or -1 on error.
+ */
+VipsOperationFlags
+vips_operation_get_flags( VipsOperation *operation ) 
+{
+	VipsOperationClass *class = VIPS_OPERATION_GET_CLASS( operation );
+
+	return( class->get_flags( operation ) );
+}
+
 /**
  * vips_operation_class_print_usage: (skip)
  * @operation_class: class to print usage for
@@ -913,24 +956,3 @@ vips_call_argv( VipsOperation *operation, int argc, char **argv )
 
 	return( 0 );
 }
-
-/**
- * vips_operation_set_nocache: 
- * @operation: operation to set
- * @nocache: TRUE means don't cache this operation
- *
- * Set this before the end of _build() to stop this operation being cached.
- * Some operations, like sequential read from a TIFF file, for example, cannot
- * be reused.
- */
-void 
-vips_operation_set_nocache( VipsOperation *operation, gboolean nocache )
-{
-#ifdef VIPS_DEBUG
-	printf( "vips_operation_set_nocache: " );
-	vips_object_print_name( VIPS_OBJECT( operation ) );
-	printf( " %d\n", nocache );
-#endif /*VIPS_DEBUG*/
-
-	operation->nocache = nocache;
-}

libvips/resample/shrink.c

@@ -360,6 +360,7 @@ vips_shrink_class_init( VipsShrinkClass *class )
 {
 	GObjectClass *gobject_class = G_OBJECT_CLASS( class );
 	VipsObjectClass *vobject_class = VIPS_OBJECT_CLASS( class );
+	VipsOperationClass *operation_class = VIPS_OPERATION_CLASS( class );
 
 	VIPS_DEBUG_MSG( "vips_shrink_class_init\n" );
 
@@ -370,6 +371,8 @@ vips_shrink_class_init( VipsShrinkClass *class )
 	vobject_class->description = _( "shrink an image" );
 	vobject_class->build = vips_shrink_build;
 
+	operation_class->flags = VIPS_OPERATION_SEQUENTIAL;
+
 	VIPS_ARG_DOUBLE( class, "xshrink", 8, 
 		_( "Xshrink" ), 
 		_( "Horizontal shrink factor" ),