/// <summary>
/// Applies a filter to an image.
/// </summary>
/// <param name="filter">The filter to apply. Must not be null.</param>
/// <param name="image">The image to which the filter is applied.</param>
/// <returns>A new image with the filter applied.</returns>
private Image ApplyFilter(IFilterImage filter, Image image)
{
// Sanity check input
if (filter == null)
{
throw new ArgumentNullException(nameof(filter));
}
if (image == null)
{
throw new ArgumentNullException(nameof(image));
}
// Create a new bitmap from the existing image
Bitmap result = new Bitmap(image);
// Copy the pixel colors of the existing bitmap to a new 2D - color array for further processing.
Color[,] colors = new Color[result.Width, result.Height];
for (int x = 0; x < result.Width; x++)
{
for (int y = 0; y < result.Height; y++)
{
colors[x, y] = result.GetPixel(x, y);
}
}
//Todo: we can pass the width and height to Apply method , so that no need to get the width and height of image one more time.
// Apply the user defined filter.
var filteredImageData = filter.Apply(colors);
// Copy the resulting array back to the bitmap
for (int x = 0; x < result.Width; x++)
{
for (int y = 0; y < result.Height; y++)
{
result.SetPixel(x, y, filteredImageData[x, y]);
}
}
return(result);
}
