buffer load/save in python works

TODO

@@ -1,9 +1,17 @@
 
 - python:
 
-	- turns blobs into strings on return with .get()
+	- new_from_memory() needs length as well as data so we can pass it a
+	  string
+
+	- do write_to_memory as well
+
+	- something to make a mask from a list of lists
+
+	- set scale and offset on masko
+
+	- how about the in-place things? draw a circle?
 
-		finish get_value
 
 	- add more constructors
 

libvips/foreign/foreign.c

@@ -582,24 +582,26 @@ vips_foreign_find_load_buffer_sub( VipsForeignLoadClass *load_class,
 
 /**
  * vips_foreign_find_load_buffer:
- * @buf: start of memory buffer
+ * @data: (array length=size) (element-type guint8) (transfer none): start of 
- * @len: length of memory buffer
+ * memory buffer
+ * @size: number of bytes in @data
  *
  * Searches for an operation you could use to load a memory buffer.
  *
  * See also: vips_image_new_from_buffer().
  *
- * Returns: the name of an operation on success, %NULL on error
+ * Returns: (transfer none): the name of an operation on success, %NULL on 
+ * error.
  */
 const char *
-vips_foreign_find_load_buffer( void *buf, size_t len )
+vips_foreign_find_load_buffer( void *data, size_t size )
 {
 	VipsForeignLoadClass *load_class;
 
 	if( !(load_class = (VipsForeignLoadClass *) vips_foreign_map( 
 		"VipsForeignLoad",
 		(VipsSListMap2Fn) vips_foreign_find_load_buffer_sub, 
-		&buf, &len )) ) {
+		&data, &size )) ) {
 		vips_error( "VipsForeignLoad", 
 			"%s", _( "buffer is not in a known format" ) ); 
 		return( NULL );

libvips/include/vips/foreign.h

@@ -214,7 +214,7 @@ typedef struct _VipsForeignLoadClass {
 GType vips_foreign_load_get_type( void );
 
 const char *vips_foreign_find_load( const char *filename );
-const char *vips_foreign_find_load_buffer( void *buf, size_t len );
+const char *vips_foreign_find_load_buffer( void *data, size_t size );
 
 VipsForeignFlags vips_foreign_flags( const char *loader, const char *filename );
 gboolean vips_foreign_is_a( const char *loader, const char *filename );

python/try6.py

@@ -2,8 +2,8 @@
 
 import sys
 
-import logging
+#import logging
-logging.basicConfig(level = logging.DEBUG)
+#logging.basicConfig(level = logging.DEBUG)
 
 from gi.repository import Vips 
 from vips8 import vips
@@ -11,3 +11,5 @@ from vips8 import vips
 a = Vips.Image.new_from_file(sys.argv[1])
 
 b = a.write_to_buffer(".jpg")
+
+c = Vips.Image.new_from_buffer(b, "")

python/vips8/vips.py

@@ -211,6 +211,15 @@ def vips_image_new_from_file(cls, vips_filename, **kwargs):
 
     return _call_base(loader, [filename], kwargs, None, option_string)
 
+# this is a class method
+def vips_image_new_from_buffer(cls, data, option_string, **kwargs):
+    loader = Vips.Foreign.find_load_buffer(data)
+    if loader == None:
+        raise Error('No known loader for buffer.')
+    logging.debug('Image.new_from_buffer: loader = %s' % loader)
+
+    return _call_base(loader, [data], kwargs, None, option_string)
+
 def vips_image_getattr(self, name):
     logging.debug('Image.__getattr__ %s' % name)
 
@@ -352,6 +361,7 @@ def vips_invert(self):
 
 # class methods
 setattr(Vips.Image, 'new_from_file', classmethod(vips_image_new_from_file))
+setattr(Vips.Image, 'new_from_buffer', classmethod(vips_image_new_from_buffer))
 
 # instance methods
 Vips.Image.write_to_file = vips_image_write_to_file