/// <summary>
/// Scales an image to fill the specified bounds while maintaining aspect ratio.
/// Any part of the image that spills outside the bounds will be cropped out.
/// </summary>
/// <param name="imageData">An array containing the image data.</param>
/// <param name="width">The width, as the number of pixels, to for the bounds.</param>
/// <param name="height">The height, as the number of pixels, to for the bounds.</param>
/// <returns>A scaled image.</returns>
public byte[] ScaleToFill(byte[] imageData, int width, int height)
{
Throw.IfArgumentNull(imageData, "imageData");
if (width < 1)
{
throw new ArgumentException("The width (" + width + ") must be greater than zero.", nameof(width));
}
if (height < 1)
{
throw new ArgumentException("The height (" + height + ") must be greater than zero.", nameof(height));
}
UIImage image = UIImageByteConverter.FromBytes(imageData);
if (image.Size.Width != width || image.Size.Height != height)
{
RectangleF newBounds =
this.CalculateBoundsForScaling(
image.CGImage.Width,
image.CGImage.Height,
image.Orientation,
Math.Max(width, height),
ScaleMode.Fill);
return(this.Scale(image, new CGSize(width, height), newBounds));
}
return(imageData);
}
/// <summary>
/// Scales an image to fit within the maximum defined pixel resolution.
/// </summary>
/// <param name="imageData">An array containing the image data.</param>
/// <param name="maxResolution">The maximum resolution, in number of pixels.</param>
/// <returns>A scalled image.</returns>
public byte[] ScaleToFit(byte[] imageData, int maxResolution)
{
Throw.IfArgumentNull(imageData, "imageData");
if (maxResolution < 1)
{
throw new ArgumentException("The maximum resolution (" + maxResolution + ") must be greater than zero.", nameof(maxResolution));
}
UIImage image = UIImageByteConverter.FromBytes(imageData);
if (image.CGImage.Width > maxResolution || image.CGImage.Height > maxResolution)
{
RectangleF newBounds =
this.CalculateBoundsForScaling(
image.CGImage.Width,
image.CGImage.Height,
image.Orientation,
maxResolution,
ScaleMode.Fit);
return(this.Scale(image, newBounds.Size, newBounds));
}
return(imageData);
}
private byte[] Scale(UIImage imageToScale, CGSize destinationSize, CGRect destinationRect)
{
UIGraphics.BeginImageContext(destinationSize);
imageToScale.Draw(destinationRect);
UIImage scaledImage = UIGraphics.GetImageFromCurrentImageContext();
UIGraphics.EndImageContext();
return(UIImageByteConverter.ToBytesAsJpeg(scaledImage, this.compressionQuality));
}
