From e36182cd8c5dd5c6d0aa1f77cf5cdca87e8bb1f0 Mon Sep 17 00:00:00 2001
From: Joseph Redmon <pjreddie@gmail.com>
Date: Fri, 21 Nov 2014 23:35:19 +0000
Subject: [PATCH] cleaned up data parsing a lot. probably nothing broken?

---
 src/col2im.cl |   14 +++++++++-----
 1 files changed, 9 insertions(+), 5 deletions(-)

diff --git a/src/col2im.cl b/src/col2im.cl
index 00d8f83..2ccf89e 100644
--- a/src/col2im.cl
+++ b/src/col2im.cl
@@ -21,13 +21,15 @@
     id /= channels;
     int b = id%batch;
 
-    int w_start = (w<ksize)?0:(w-ksize)/stride + 1;
+    //int w_start = (w<ksize)?0:(w-ksize)/stride + 1;
+    int w_start = (w-ksize+stride)/stride;
     int w_end = w/stride + 1;
-    if(width_col < w_end) w_end = width_col;
+    //w_end = (width_col < w_end) ? width_col : w_end;
 
-    int h_start = (h<ksize)?0:(h-ksize)/stride+1;
+    int h_start = (h-ksize+stride)/stride;
+    //int h_start = (h-ksize)/stride+1;
     int h_end = h/stride + 1;
-    if(height_col < h_end) h_end = height_col;
+    //h_end = (height_col < h_end) ? height_col : h_end;
 
     int rows = channels * ksize * ksize;
     int cols = height_col*width_col;
@@ -39,7 +41,9 @@
     int h_col, w_col;
     for(h_col = h_start; h_col < h_end; ++h_col){
         for(w_col = w_start; w_col < w_end; ++w_col){
-            val += data_col[offset +h_col*h_coeff + w_col*w_coeff];
+            int col_index = offset +h_col*h_coeff + w_col*w_coeff;
+            float part = (w_col < 0 || h_col < 0 || h_col >= height_col || w_col >= width_col) ? 0 : data_col[col_index];
+            val += part;
         }
     }
     data_im[index] = val;

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