From d17b33131c14864bd1eae275f49a3f148e21cf29 Mon Sep 17 00:00:00 2001
From: Leo Chan <leochanj@live.unc.edu>
Date: Thu, 22 Oct 2020 01:53:21 -0400
Subject: Squashed commit of the sb-vbs branch.

Includes the SD-VBS benchmarks modified to:
- Use libextra to loop as realtime jobs
- Preallocate memory before starting their main computation
- Accept input via stdin instead of via argc

Does not include the SD-VBS matlab code.

Fixes libextra execution in LITMUS^RT.
---
 SD-VBS/common/c/imageResize.c | 78 +++++++++++++++++++++++++++++++++++++++++++
 1 file changed, 78 insertions(+)
 create mode 100644 SD-VBS/common/c/imageResize.c

(limited to 'SD-VBS/common/c/imageResize.c')

diff --git a/SD-VBS/common/c/imageResize.c b/SD-VBS/common/c/imageResize.c
new file mode 100644
index 0000000..72c0881
--- /dev/null
+++ b/SD-VBS/common/c/imageResize.c
@@ -0,0 +1,78 @@
+/********************************
+Author: Sravanthi Kota Venkata
+********************************/
+
+#include "sdvbs_common.h"
+
+F2D* imageResize(F2D* imageIn)
+{
+    int m, k, rows, cols;
+    F2D *imageOut;
+    I2D *kernel;
+    float tempVal;
+    int kernelSize, startCol, endCol, halfKernel, startRow, endRow, i, j, kernelSum;
+    int outputRows, outputCols;
+    F2D *temp;
+
+    rows = imageIn->height;
+    cols = imageIn->width;
+    
+    // level 1 is the base image.
+
+    outputRows = floor((rows+1)/2);
+    outputCols = floor((cols+1)/2);
+
+    temp = fSetArray(rows, outputCols, 0);
+    imageOut = fSetArray(outputRows, outputCols, 0);
+    kernel = iMallocHandle(1, 5);
+
+    asubsref(kernel,0) = 1;
+    asubsref(kernel,1) = 4;
+    asubsref(kernel,2) = 6;
+    asubsref(kernel,3) = 4;
+    asubsref(kernel,4) = 1;
+    kernelSize = 5;
+    kernelSum = 16;
+
+    startCol = 2;      
+    endCol = cols - 2;  
+    halfKernel = 2;  
+
+    startRow = 2;  
+    endRow = rows - 2; 
+
+    for(i=startRow; i<endRow; i++)
+    {
+        m = 0;
+        for(j=startCol; j<endCol; j+=2)
+        {
+            tempVal = 0;
+            for(k=-halfKernel; k<=halfKernel; k++)
+            {
+                tempVal += subsref(imageIn,i,j+k) * asubsref(kernel,k+halfKernel);
+            }
+            subsref(temp,i,m) = tempVal/kernelSum;
+            m = m+1;
+        }
+    }
+    
+    m = 0;
+    for(i=startRow; i<endRow; i+=2)
+    {
+        for(j=0; j<outputCols; j++)
+        {
+            tempVal = 0;
+            for(k=-halfKernel; k<=halfKernel; k++)
+            {
+                tempVal += subsref(temp,(i+k),j) * asubsref(kernel,k+halfKernel);
+            }
+            subsref(imageOut,m,j) = (tempVal/kernelSum);
+        }    
+        m = m+1;
+    }
+
+    fFreeHandle(temp);
+    iFreeHandle(kernel);
+    return imageOut;
+    
+}
-- 
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