public byte[] SizeTo(byte[] imageBytes, ushort? width, ushort? height, ImageSizingBehavior behavior = ImageSizingBehavior.Fit)
{
// Must specify width or height
if ((!width.HasValue || width.Value == 0) && (!height.HasValue || height.Value == 0))
throw new ArgumentNullException("Width or Height must be specified to resize the image");
// Create a new bitmap
var bitmap = new Bitmap(new MemoryStream(imageBytes));
int actualWidth = width.HasValue ? width.Value : 0,
actualHeight = height.HasValue ? height.Value : 0;
// If either size is zero or behavior specifies to maintain the ratio
if (actualWidth <= 0 ||
actualHeight <= 0 ||
(behavior & ImageSizingBehavior.MaintainAspectRatio) == ImageSizingBehavior.MaintainAspectRatio)
{
// Calculate the ratio
var ratio = Convert.ToDouble(bitmap.Width) / bitmap.Height;
// Determine the width and height based on the ratio of the width to the height
if (actualHeight == 0 || (actualWidth > 0 && ratio >= 1))
actualHeight = Convert.ToInt32(Math.Floor(Math.Round(actualWidth / ratio, 0)));
else
actualWidth = Convert.ToInt32(Math.Floor(Math.Round(actualHeight * ratio, 0)));
}
// If image is larger and behavior doesn't allow for reduction, return original image
if ((bitmap.Width >= actualWidth || bitmap.Height >= actualHeight) &&
(behavior & ImageSizingBehavior.Reduce) != ImageSizingBehavior.Reduce)
return imageBytes;
// If image is smaller and behavior doesn't allow for enlarging, return original image
if ((bitmap.Width <= actualWidth || bitmap.Height <= actualHeight) &&
(behavior & ImageSizingBehavior.Enlarge) != ImageSizingBehavior.Enlarge)
return imageBytes;
return SizeTo(bitmap, actualWidth, actualHeight);
}
public byte[] SizeTo(byte[] imageBytes, ushort widthOrHeight, ImageSizingBehavior behavior = ImageSizingBehavior.Fit)
{
// Force maintain the aspect ratio
return SizeTo(imageBytes, widthOrHeight, widthOrHeight, behavior | ImageSizingBehavior.MaintainAspectRatio);
}
