From 85427e9d79b8f9b5815a2757ce822db9dfbb25cb Mon Sep 17 00:00:00 2001
From: tradke <tradke@10716dce-81a3-4424-a2c8-48026a0d3035>
Date: Mon, 18 Feb 2002 09:42:09 +0000
Subject: Bugfix for hyperslab extraction with data conversion and downsampling
 applied in the lowest dimension.

git-svn-id: http://svn.cactuscode.org/arrangements/CactusPUGH/PUGHSlab/trunk@71 10716dce-81a3-4424-a2c8-48026a0d3035
---
 src/NewHyperslab.c | 49 ++++++++++++++++++-------------------------------
 1 file changed, 18 insertions(+), 31 deletions(-)

diff --git a/src/NewHyperslab.c b/src/NewHyperslab.c
index 37aeeb0..d4854d1 100644
--- a/src/NewHyperslab.c
+++ b/src/NewHyperslab.c
@@ -222,6 +222,7 @@ int NewHyperslab_GetLocalHyperslab (const cGH *GH,
   int *startpoint,               /* hyperslab's local start and endpoint */
       *endpoint;                 /* within the variable's grid dimensions */
   int *downsample;               /* the downsample_[] vector extended to vdim */
+  int *vdata_stride;             /* strides into source data (in bytes) */
   int *my_global_startpoint,     /* hyperslab's global start and endpoint */
       *global_endpoint;
   int *points_per_dim;           /* points per subvolume */
@@ -300,14 +301,15 @@ int NewHyperslab_GetLocalHyperslab (const cGH *GH,
   retval = 0;
 
   /* allocate the temporary arrays */
-  point = (int *) malloc (8 * vinfo.dim * sizeof (int));
+  point = (int *) malloc (9 * vinfo.dim * sizeof (int));
   startpoint           = point + 1*vinfo.dim;
   endpoint             = point + 2*vinfo.dim;
   my_global_startpoint = point + 3*vinfo.dim;
   global_endpoint      = point + 4*vinfo.dim;
   downsample           = point + 5*vinfo.dim;
-  do_dir               = point + 6*vinfo.dim;
-  points_per_dim       = point + 7*vinfo.dim;
+  vdata_stride         = point + 6*vinfo.dim;
+  do_dir               = point + 7*vinfo.dim;
+  points_per_dim       = point + 8*vinfo.dim;
 
   /* get the actual directions in which to spawn the hyperslab */
   memcpy (do_dir, directions, vinfo.dim * sizeof (int));
@@ -538,9 +540,9 @@ int NewHyperslab_GetLocalHyperslab (const cGH *GH,
       /* transform the ranges into byte ranges */
       for (i = 0; i < vinfo.dim; i++)
       {
-        startpoint[i] *= vdata_size;
-        endpoint[i]   *= vdata_size;
-        downsample[i] *= vdata_size;
+        startpoint[i]  *= vdata_size;
+        endpoint[i]    *= vdata_size;
+        vdata_stride[i] = downsample[i] * vdata_size;
       }
 
       /* initialize the index vector to the local startpoint */
@@ -556,7 +558,7 @@ int NewHyperslab_GetLocalHyperslab (const cGH *GH,
           /* increment outermost loopers */
           for (vdim++; vdim < vinfo.dim; vdim++)
           {
-            point[vdim] += downsample[vdim];
+            point[vdim] += vdata_stride[vdim];
             if (point[vdim] < endpoint[vdim])
             {
               break;
@@ -584,34 +586,19 @@ int NewHyperslab_GetLocalHyperslab (const cGH *GH,
           typed_vdata += point[i] * points_per_dim[i];
         }
 
-        /* copy the data in lowest dimension: if possible copy all data points
-           in a row otherwise do it one by one */
-        if (downsample[0] == vdata_size)
+        /* copy the data in lowest dimension */
+        if (conversion_fn)
         {
-          if (conversion_fn)
-          {
-            conversion_fn (typed_vdata, typed_hdata, dim0_points, 1, 1);
-          }
-          else
-          {
-            memcpy (typed_hdata, typed_vdata, dim0_hsize);
-          }
+          conversion_fn (typed_vdata, typed_hdata, dim0_points,
+                         downsample[0], 1);
+          typed_vdata += vdata_stride[0] * dim0_points;
         }
         else
         {
-          if (conversion_fn)
+          for (i = 0; i < dim0_hsize; i += hdata_size)
           {
-            conversion_fn (typed_vdata, typed_hdata, dim0_points,
-                           downsample[0], 1);
-            typed_vdata += downsample[0] * dim0_points;
-          }
-          else
-          {
-            for (i = 0; i < dim0_hsize; i += hdata_size)
-            {
-              memcpy (typed_hdata + i, typed_vdata, vdata_size);
-              typed_vdata += downsample[0];
-            }
+            memcpy (typed_hdata + i, typed_vdata, vdata_size);
+            typed_vdata += vdata_stride[0];
           }
         }
         typed_hdata += dim0_hsize;
@@ -619,7 +606,7 @@ int NewHyperslab_GetLocalHyperslab (const cGH *GH,
         if (vinfo.dim > 1)
         {
           /* increment current looper */
-          point[vdim] += downsample[vdim];
+          point[vdim] += vdata_stride[vdim];
         }
         else
         {
-- 
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