/// <summary>
/// Computes the result icon image size.
/// </summary>
/// <param name="originalSize">The original size.</param>
/// <param name="parameter">The conversion parameter.</param>
/// <returns>Icon image size.</returns>
/// <seealso cref="ResizeKind"/>
private Size ComputeIconSize(Size originalSize, ConversionParameter parameter)
{
// If the resize kind is None, do nothing.
if (parameter.ResizeKind == ResizeKind.None)
{
return(new Size(originalSize.Width, originalSize.Height));
}
// If the original image size is smaller then MaxSize, do noting.
if (originalSize.Width <= parameter.MaxSize && originalSize.Height <= parameter.MaxSize)
{
return(new Size(originalSize.Width, originalSize.Height));
}
var isMaximumSmaller = parameter.ResizeKind == ResizeKind.KeepAspect ||
parameter.ResizeKind == ResizeKind.MaximumSizeSmallerThanSquare;
return(Resize(originalSize, parameter.MaxSize, isMaximumSmaller));
}
/// <summary>
/// Convert an image to the image whose format is ".ico".
/// </summary>
/// <param name="image">Source image.</param>
/// <param name="parameter">Conversion parameter. <see cref="ConversionParameter"/></param>
/// <returns>Icon image.</returns>
public Image ConvertImageToIconBitmap(Image image, ConversionParameter parameter)
{
var iconSize = ComputeIconSize(new Size(image.Width, image.Height), parameter);
var edgeLength = Math.Max(iconSize.Width, iconSize.Height);
using var bmp = new Bitmap(edgeLength, edgeLength);
using (var g = Graphics.FromImage(bmp))
{
g.PageUnit = GraphicsUnit.Pixel;
var offsetX = (int)(Math.Round((bmp.Width - iconSize.Width) / 2.0));
var offsetY = (int)(Math.Round((bmp.Height - iconSize.Height) / 2.0));
g.DrawImage(image, new Rectangle(offsetX, offsetY, iconSize.Width, iconSize.Height),
new Rectangle(0, 0, image.Width, image.Height), GraphicsUnit.Pixel);
}
var filePath = CreateTempFilePath();
bmp.Save(filePath, ImageFormat.Icon);
return(new Bitmap(new MemoryStream(_fileSystem.File.ReadAllBytes(filePath))));
}
public Image CreateIconImageFromFilePath(string sourceImageFilePath, ConversionParameter parameter)
{
var image = LoadImage(sourceImageFilePath);
return(ConvertImageToIconBitmap(image, parameter));
}
