mg2d: export the local component extents in public API

1 files changed, 17 insertions, 0 deletions

diff --git a/mg2d.h b/mg2d.h
index 1db4ace..47d709e 100644
--- a/mg2d.h
+++ b/mg2d.h
@@ -162,6 +162,23 @@ typedef struct MG2DContext {
      * exact solve is performed.
      */
     size_t max_exact_size;
+
+    /**
+     * Indices of the lower left corner of the local domain in the full
+     * computational grid, for distributed solvers. Always { 0, 0 } for
+     * single-component solvers.
+     *
+     * Set by mg2d_solver_alloc[_mpi]().
+     */
+    ptrdiff_t local_start[2];
+
+    /**
+     * Number of points in the local component in each direction. Equal to
+     * { domain_size, domain_size } for single-component solvers.
+     *
+     * Set by mg2d_solver_alloc[_mpi]().
+     */
+    size_t    local_size[2];
 } MG2DContext;
 
 /**