From 2471f842af1c855c7d4a304f10291a73cecb6f5f Mon Sep 17 00:00:00 2001
From: bot50 <bot@cs50.harvard.edu>
Date: Fri, 8 Mar 2024 11:15:08 +0000
Subject: [PATCH] 
 kukemuna-cs50/problems/2024/x/filter/less@20240308T111509.001640609Z

---
 helpers.c | 118 ++++++++++++++++++++++++++++++++++++++++++++++++++++++
 1 file changed, 118 insertions(+)
 create mode 100644 helpers.c

diff --git a/helpers.c b/helpers.c
new file mode 100644
index 0000000..c7db2d4
--- /dev/null
+++ b/helpers.c
@@ -0,0 +1,118 @@
+#include <math.h>
+#include "helpers.h"
+
+// Convert image to grayscale
+void grayscale(int height, int width, RGBTRIPLE image[height][width])
+{
+    for (int i = 0; i < height; i++)
+    {
+        for (int j = 0; j < width; j++)
+        {
+            int avg = round((image[i][j].rgbtBlue + image[i][j].rgbtGreen + image[i][j].rgbtRed) / 3);
+            image[i][j].rgbtBlue = image[i][j].rgbtGreen = image[i][j].rgbtRed = avg;
+        }
+    }
+    return;
+}
+
+// Convert image to sepia
+void sepia(int height, int width, RGBTRIPLE image[height][width])
+{
+    for (int i = 0; i < height; i++)
+    {
+        for (int j = 0; j < width; j++)
+        {
+            int sepiaRed = round(.393 * image[i][j].rgbtRed + .769 * image[i][j].rgbtGreen + .189 * image[i][j].rgbtBlue);
+            int sepiaGreen = round(.349 * image[i][j].rgbtRed + .686 * image[i][j].rgbtGreen + .168 * image[i][j].rgbtBlue);
+            int sepiaBlue = round(.272 * image[i][j].rgbtRed + .534 * image[i][j].rgbtGreen + .131 * image[i][j].rgbtBlue);
+
+            if (sepiaRed > 255)
+            {
+                sepiaRed = 255;
+            }
+            if (sepiaGreen > 255)
+            {
+                sepiaGreen = 255;
+            }
+            if (sepiaBlue > 255)
+            {
+                sepiaBlue = 255;
+            }
+
+            image[i][j].rgbtBlue = sepiaBlue;
+            image[i][j].rgbtGreen = sepiaGreen;
+            image[i][j].rgbtRed = sepiaRed;
+        }
+    }
+
+    return;
+}
+
+// Reflect image horizontally
+void reflect(int height, int width, RGBTRIPLE image[height][width])
+{
+    RGBTRIPLE tmp[height][width];
+
+    for (int i = 0; i < height; i++)
+    {
+        for (int j = 0; j < width; j++)
+        {
+            tmp[i][j] = image[i][width - j - 1];
+        }
+    }
+
+    for (int i = 0; i < height; i++)
+    {
+        for (int j = 0; j < width; j++)
+        {
+            image[i][j] = tmp[i][j];
+        }
+    }
+    return;
+}
+
+// Blur image
+void blur(int height, int width, RGBTRIPLE image[height][width])
+{
+    RGBTRIPLE copy[height][width];
+
+    for (int i = 0; i < height; i++)
+    {
+        for (int j = 0; j < width; j++)
+        {
+            copy[i][j] = image[i][j];
+        }
+    }
+
+    for (int i = 0; i < height; i++)
+    {
+        for (int j = 0; j < width; j++)
+        {
+            float sumRed = 0, sumGreen = 0, sumBlue = 0;
+            int count = 0;
+
+            for (int k = -1; k < 2; k++)
+            {
+                for (int l = -1; l < 2; l++)
+                {
+                    if (i + k <= 0 || i + k >= height)
+                    {
+                        continue;
+                    }
+                    if (j + l <= 0 || j + l >= width)
+                    {
+                        continue;
+                    }
+                    sumRed += copy[i + k][j + l].rgbtRed;
+                    sumGreen += copy[i + k][j + l].rgbtGreen;
+                    sumBlue += copy[i + k][j + l].rgbtBlue;
+                    count++;
+                }
+            }
+            image[i][j].rgbtRed = round(sumRed / count);
+            image[i][j].rgbtGreen = round(sumGreen / count);
+            image[i][j].rgbtBlue = round(sumBlue / count);
+        }
+    }
+    return;
+}