Blur filter

blur.c

// Blur image
void blur(int height, int width, RGBTRIPLE image[height][width])
{
    float avg1 = 0.00;
    float avg2 = 0.00;
    float avg3 = 0.00;

    RGBTRIPLE temp[height][width];

    for (int h = 0; h < height; h ++)
    {
        for (int w = 0; w < width; w ++)
        {
            temp[h][w] = image[h][w];
        }
    }

    for (int h = 0; h < height; h ++)
    {
        for (int w = 0; w < width; w ++)
        {
            if ((h == 0) && (w == 0))
            {
                // code (1)
                // left top corner

                avg1 = (temp[h][w].rgbtRed + temp[h][w + 1].rgbtRed + temp[h + 1][w].rgbtRed + temp[h + 1][w + 1].rgbtRed) / 4.00;
                avg2 = (temp[h][w].rgbtGreen + temp[h][w + 1].rgbtGreen + temp[h + 1][w].rgbtGreen + temp[h + 1][w + 1].rgbtGreen) / 4.00;
                avg3 = (temp[h][w].rgbtBlue + temp[h][w + 1].rgbtBlue + temp[h + 1][w].rgbtBlue + temp[h + 1][w + 1].rgbtBlue) / 4.00;

                image[h][w].rgbtRed = round(avg1);
                image[h][w].rgbtGreen = round(avg2);
                image[h][w].rgbtBlue = round(avg3);
            }
            else if ((h != 0) && (h != (height - 1)) && (w == 0))
            {
                // code (2)
                // left edge

                avg1 = (temp[h][w].rgbtRed + temp[h][w + 1].rgbtRed + temp[h - 1][w].rgbtRed + temp[h - 1][w + 1].rgbtRed + temp[h + 1][w].rgbtRed + temp[h + 1][w + 1].rgbtRed) / 6.00;
                avg2 = (temp[h][w].rgbtGreen + temp[h][w + 1].rgbtGreen + temp[h - 1][w].rgbtGreen + temp[h - 1][w + 1].rgbtGreen + temp[h + 1][w].rgbtGreen + temp[h + 1][w + 1].rgbtGreen) / 6.00;
                avg3 = (temp[h][w].rgbtBlue + temp[h][w + 1].rgbtBlue + temp[h - 1][w].rgbtBlue + temp[h - 1][w + 1].rgbtBlue + temp[h + 1][w].rgbtBlue + temp[h + 1][w + 1].rgbtBlue) / 6.00;

                image[h][w].rgbtRed = round(avg1);
                image[h][w].rgbtGreen = round(avg2);
                image[h][w].rgbtBlue = round(avg3);
            }
            else if ((h != 0) && (h == (height - 1)) && (w == 0))
            {
                // code (3)
                // left bottom corner

                avg1 = (temp[h][w].rgbtRed + temp[h][w + 1].rgbtRed + temp[h - 1][w].rgbtRed + temp[h - 1][w + 1].rgbtRed) / 4.00;
                avg2 = (temp[h][w].rgbtGreen + temp[h][w + 1].rgbtGreen + temp[h - 1][w].rgbtGreen + temp[h - 1][w + 1].rgbtGreen) / 4.00;
                avg3 = (temp[h][w].rgbtBlue + temp[h][w + 1].rgbtBlue + temp[h - 1][w].rgbtBlue + temp[h - 1][w + 1].rgbtBlue) / 4.00;

                image[h][w].rgbtRed = round(avg1);
                image[h][w].rgbtGreen = round(avg2);
                image[h][w].rgbtBlue = round(avg3);
            }
            else if ((h == (height - 1)) && (w != 0) && (w != (width - 1)))
            {
                // code (4)
                // bottom edge

                avg1 = (temp[h][w].rgbtRed + temp[h][w + 1].rgbtRed + temp[h][w - 1].rgbtRed + temp[h - 1][w].rgbtRed + temp[h - 1][w + 1].rgbtRed + temp[h - 1][w - 1].rgbtRed) / 6.00;
                avg2 = (temp[h][w].rgbtGreen + temp[h][w + 1].rgbtGreen + temp[h][w - 1].rgbtGreen + temp[h - 1][w].rgbtGreen + temp[h - 1][w + 1].rgbtGreen + temp[h - 1][w - 1].rgbtGreen) / 6.00;
                avg3 = (temp[h][w].rgbtBlue + temp[h][w + 1].rgbtBlue + temp[h][w - 1].rgbtBlue + temp[h - 1][w].rgbtBlue + temp[h - 1][w + 1].rgbtBlue + temp[h - 1][w - 1].rgbtBlue) / 6.00;

                image[h][w].rgbtRed = round(avg1);
                image[h][w].rgbtGreen = round(avg2);
                image[h][w].rgbtBlue = round(avg3);
            }
            else if ((h == (height - 1)) && (w == (width - 1)))
            {
                // code (5)
                // right bottom corner

                avg1 = (temp[h][w].rgbtRed + temp[h][w - 1].rgbtRed + temp[h - 1][w].rgbtRed + temp[h - 1][w - 1].rgbtRed) / 4.00;
                avg2 = (temp[h][w].rgbtGreen + temp[h][w - 1].rgbtGreen + temp[h - 1][w].rgbtGreen + temp[h - 1][w - 1].rgbtGreen) / 4.00;
                avg3 = (temp[h][w].rgbtBlue + temp[h][w - 1].rgbtBlue + temp[h - 1][w].rgbtBlue + temp[h - 1][w - 1].rgbtBlue) / 4.00;

                image[h][w].rgbtRed = round(avg1);
                image[h][w].rgbtGreen = round(avg2);
                image[h][w].rgbtBlue = round(avg3);
            }
            else if ((h != 0) && (h != (height - 1)) && (w == (width - 1)))
            {
                // code (6)
                // right edge

                avg1 = (temp[h][w].rgbtRed + temp[h][w - 1].rgbtRed + temp[h + 1][w].rgbtRed + temp[h + 1][w - 1].rgbtRed + temp[h - 1][w].rgbtRed + temp[h - 1][w - 1].rgbtRed) / 6.00;
                avg2 = (temp[h][w].rgbtGreen + temp[h][w - 1].rgbtGreen + temp[h + 1][w].rgbtGreen + temp[h + 1][w - 1].rgbtGreen + temp[h - 1][w].rgbtGreen + temp[h - 1][w - 1].rgbtGreen) / 6.00;
                avg3 = (temp[h][w].rgbtBlue + temp[h][w - 1].rgbtBlue + temp[h + 1][w].rgbtBlue + temp[h + 1][w - 1].rgbtBlue + temp[h - 1][w].rgbtBlue + temp[h - 1][w - 1].rgbtBlue) / 6.00;

                image[h][w].rgbtRed = round(avg1);
                image[h][w].rgbtGreen = round(avg2);
                image[h][w].rgbtBlue = round(avg3);
            }
            else if ((h == 0) && (w == (width - 1)))
            {
                // code (7)
                // top right corner

                avg1 = (temp[h][w].rgbtRed + temp[h][w - 1].rgbtRed + temp[h + 1][w].rgbtRed + temp[h + 1][w - 1].rgbtRed) / 4.00;
                avg2 = (temp[h][w].rgbtGreen + temp[h][w - 1].rgbtGreen + temp[h + 1][w].rgbtGreen + temp[h + 1][w - 1].rgbtGreen) / 4.00;
                avg3 = (temp[h][w].rgbtBlue + temp[h][w - 1].rgbtBlue + temp[h + 1][w].rgbtBlue + temp[h + 1][w - 1].rgbtBlue) / 4.00;

                image[h][w].rgbtRed = round(avg1);
                image[h][w].rgbtGreen = round(avg2);
                image[h][w].rgbtBlue = round(avg3);
            }
            else if ((h == 0) && (w != 0) && (w != (width - 1)))
            {
                // code (8)
                // top edge

                avg1 = (temp[h][w].rgbtRed + temp[h][w + 1].rgbtRed + temp[h][w - 1].rgbtRed + temp[h + 1][w].rgbtRed + temp[h + 1][w + 1].rgbtRed + temp[h + 1][w - 1].rgbtRed) / 6.00;
                avg2 = (temp[h][w].rgbtGreen + temp[h][w + 1].rgbtGreen + temp[h][w - 1].rgbtGreen + temp[h + 1][w].rgbtGreen + temp[h + 1][w + 1].rgbtGreen + temp[h + 1][w - 1].rgbtGreen) / 6.00;
                avg3 = (temp[h][w].rgbtBlue + temp[h][w + 1].rgbtBlue + temp[h][w - 1].rgbtBlue + temp[h + 1][w].rgbtBlue + temp[h + 1][w + 1].rgbtBlue + temp[h + 1][w - 1].rgbtBlue) / 6.00;

                image[h][w].rgbtRed = round(avg1);
                image[h][w].rgbtGreen = round(avg2);
                image[h][w].rgbtBlue = round(avg3);
            }
            else if ((h != 0) && (h != (height - 1)) && (w != 0) && (w != (width - 1)))
            {
                // code (9)
                // middle

                avg1 = (temp[h][w].rgbtRed + temp[h][w - 1].rgbtRed + temp[h][w + 1].rgbtRed + temp[h - 1][w].rgbtRed + temp[h - 1][w - 1].rgbtRed + temp[h - 1][w + 1].rgbtRed + temp[h + 1][w].rgbtRed + temp[h + 1][w - 1].rgbtRed + temp[h + 1][w + 1].rgbtRed) / 9.00;
                avg2 = (temp[h][w].rgbtGreen + temp[h][w - 1].rgbtGreen + temp[h][w + 1].rgbtGreen + temp[h - 1][w].rgbtGreen + temp[h - 1][w - 1].rgbtGreen + temp[h - 1][w + 1].rgbtGreen + temp[h + 1][w].rgbtGreen + temp[h + 1][w - 1].rgbtGreen + temp[h + 1][w + 1].rgbtGreen) / 9.00;
                avg3 = (temp[h][w].rgbtBlue + temp[h][w - 1].rgbtBlue + temp[h][w + 1].rgbtBlue + temp[h - 1][w].rgbtBlue + temp[h - 1][w - 1].rgbtBlue + temp[h - 1][w + 1].rgbtBlue + temp[h + 1][w].rgbtBlue + temp[h + 1][w - 1].rgbtBlue + temp[h + 1][w + 1].rgbtBlue) / 9.00;

                image[h][w].rgbtRed = round(avg1);
                image[h][w].rgbtGreen = round(avg2);
                image[h][w].rgbtBlue = round(avg3);
            }
            else
            {
                break;
            }
        }
    }

    // ./filter -b images/yard.bmp out.bmp

    return;
}