API:

- replaced BKE_copy_images with BKE_export_image, now it handles only one image at a time, this is better since for exporters it is 
easier to export one image at a time writing new image path to a file
- exposing BKE_export_image in RNA as Image.export, interestingly, RNA allowed me to define a function with PROP_STRING return type 
although it doesn't free memory, will fix that in the next commit
- removed bpy.util.copy_images

Unit tests:
- re-wrote a test for BKE_export_image, it's more compact now
- moved unit tests to the creator module to avoid another executable, now running tests with `blender --test`
- as before, unit tests are built only if WITH_BF_UNIT_TEST is non 0

source/blender/python/intern/bpy_interface.c

@@ -93,7 +93,7 @@ void BPY_update_modules( void )
 	PyObject *mod= PyImport_ImportModuleLevel("bpy", NULL, NULL, NULL, 0);
 	PyModule_AddObject( mod, "data", BPY_rna_module() );
 	PyModule_AddObject( mod, "types", BPY_rna_types() );
-	PyModule_AddObject( mod, "util", BPY_util_module() );
+	/* PyModule_AddObject( mod, "util", BPY_util_module() ); */
 
 	/* XXX this will move to bpy.util */
 	PyModule_AddObject( mod, "sys", BPY_sys_module() );

source/blender/python/intern/bpy_util.c

@@ -488,126 +488,3 @@ int BPy_errors_to_report(ReportList *reports)
 	Py_DECREF(pystring);
 	return 1;
 }
-
-
-/* bpy.util module */
-static PyObject *bpy_util_copy_images(PyObject *self, PyObject *args);
-
-struct PyMethodDef bpy_util_methods[] = {
-	{"copy_images", bpy_util_copy_images, METH_VARARGS, NULL},
-	{NULL, NULL, 0, NULL}
-};
-
-#if PY_VERSION_HEX >= 0x03000000
-static struct PyModuleDef bpy_util_module = {
-	PyModuleDef_HEAD_INIT,
-	"bpyutil",
-	NULL,
-	-1,
-	bpy_util_methods,
-	NULL, NULL, NULL, NULL
-};
-#endif
-
-PyObject *BPY_util_module( void )
-{
-	PyObject *submodule, *dict;
-
-#if PY_VERSION_HEX >= 0x03000000
-	submodule= PyModule_Create(&bpy_util_module);
-#else /* Py2.x */
-	submodule= Py_InitModule3("bpyutil", bpy_util_methods, NULL);
-#endif
-
-	dict = PyModule_GetDict(submodule);
-	
-	return submodule;
-}
-
-/*
-  copy_images(images, dest_dir)
-  return filenames
-*/
-static PyObject *bpy_util_copy_images(PyObject *self, PyObject *args)
-{
-	const char *dest_dir;
-	ListBase *images;
-	ListBase *paths;
-	LinkData *link;
-	PyObject *seq;
-	PyObject *ret;
-	PyObject *item;
-	int i;
-	int len;
-
-	/* check args/types */
-	if (!PyArg_ParseTuple(args, "Os", &seq, &dest_dir)) {
-		PyErr_SetString(PyExc_TypeError, "Invalid arguments.");
-		return NULL;
-	}
-
-	/* expecting a sequence of Image objects */
-	if (!PySequence_Check(seq)) {
-		PyErr_SetString(PyExc_TypeError, "Expected a sequence of images.");
-		return NULL;
-	}
-
-	/* create image list */
-	len= PySequence_Size(seq);
-
-	if (!len) {
-		PyErr_SetString(PyExc_TypeError, "At least one image should be specified.");
-		return NULL;
-	}
-
-	/* make sure all sequence items are Image */
-	for(i= 0; i < len; i++) {
-		item= PySequence_GetItem(seq, i);
-
-		if (!BPy_StructRNA_Check(item) || ((BPy_StructRNA*)item)->ptr.type != &RNA_Image) {
-			PyErr_SetString(PyExc_TypeError, "Expected a sequence of Image objects.");
-			return NULL;
-		}
-	}
-
-	images= MEM_callocN(sizeof(*images), "ListBase of images");
-
-	for(i= 0; i < len; i++) {
-		BPy_StructRNA* srna;
-
-		item= PySequence_GetItem(seq, i);
-		srna= (BPy_StructRNA*)item;
-
-		link= MEM_callocN(sizeof(LinkData), "LinkData image");
-		link->data= srna->ptr.data;
-		BLI_addtail(images, link);
-
-		Py_DECREF(item);
-	}
-
-	paths= MEM_callocN(sizeof(*paths), "ListBase of image paths");
-
-	/* call BKE_copy_images */
-	BKE_copy_images(images, dest_dir, paths);
-
-	/* convert filenames */
-	ret= PyList_New(0);
-
-	for(link= paths->first; link; link= link->next) {
-		if (link->data) {
-			item= PyUnicode_FromString(link->data);
-			PyList_Append(ret, item);
-			Py_DECREF(item);
-		}
-		else {
-			PyList_Append(ret, Py_None);
-		}
-	}
-
-	/* free memory */
-	BLI_freelistN(images);
-	BLI_freelistN(paths);
-
-	/* return filenames */
-	return ret;
-}