Block Data interfaces: define block filter

src/Makefile.am

@@ -164,6 +164,7 @@ libstarpu_la_SOURCES = 						\
 	datawizard/interfaces/csr_interface.c			\
 	datawizard/interfaces/matrix_filters.c			\
 	datawizard/interfaces/matrix_interface.c		\
+	datawizard/interfaces/block_filters.c			\
 	datawizard/interfaces/block_interface.c			\
 	datawizard/interfaces/vector_interface.c		\
 	datawizard/interfaces/bcsr_filters.c			\

src/datawizard/interfaces/block_filters.c

@@ -0,0 +1,50 @@
+/*
+ * StarPU
+ * Copyright (C) INRIA 2008-2010 (see AUTHORS file)
+ *
+ * This program is free software; you can redistribute it and/or modify
+ * it under the terms of the GNU Lesser General Public License as published by
+ * the Free Software Foundation; either version 2.1 of the License, or (at
+ * your option) any later version.
+ *
+ * This program is distributed in the hope that it will be useful, but
+ * WITHOUT ANY WARRANTY; without even the implied warranty of
+ * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.
+ *
+ * See the GNU Lesser General Public License in COPYING.LGPL for more details.
+ */
+
+#include <starpu.h>
+#include <common/config.h>
+#include <datawizard/filters.h>
+
+void starpu_block_filter_func_block(void *father_interface, void *child_interface, struct starpu_data_filter *f, unsigned id, unsigned nparts)
+{
+        starpu_block_interface_t *block_father = father_interface;
+        starpu_block_interface_t *block_child = child_interface;
+
+	uint32_t nx = block_father->nx;
+        uint32_t ny = block_father->ny;
+        uint32_t nz = block_father->nz;
+	size_t elemsize = block_father->elemsize;
+
+	STARPU_ASSERT(nparts <= nx);
+
+	uint32_t chunk_size = (nx + nparts - 1)/nparts;
+	size_t offset = id*chunk_size*elemsize;
+
+        uint32_t child_nx = STARPU_MIN(chunk_size, nx - id*chunk_size);
+
+	block_child->nx = child_nx;
+	block_child->ny = ny;
+	block_child->nz = nz;
+	block_child->elemsize = elemsize;
+
+	if (block_father->ptr) {
+                block_child->ptr = block_father->ptr + offset;
+                block_child->ldy = block_father->ldy;
+                block_child->ldz = block_father->ldz;
+                block_child->dev_handle = block_father->dev_handle;
+                block_child->offset = block_father->offset + offset;
+	}
+}