private Bitmap resizeImageToBitmap(string trackingId, Image image, int width, int height)
{
var innerRect = ResizeMath.KeepRatio(image.Width, image.Height, width, height);
_log.info(trackingId, () => $"resize {image.Width}x{image.Height} --> {width}x{height} = [{innerRect.Top} {innerRect.Left} {innerRect.Width}x{innerRect.Height}]");
var destImage = new Bitmap(width, height);
destImage.SetResolution(image.HorizontalResolution, image.VerticalResolution);
using (var graphics = Graphics.FromImage(destImage))
{
graphics.CompositingMode = CompositingMode.SourceCopy;
graphics.CompositingQuality = CompositingQuality.HighQuality;
graphics.InterpolationMode = InterpolationMode.HighQualityBicubic;
graphics.SmoothingMode = SmoothingMode.HighQuality;
graphics.PixelOffsetMode = PixelOffsetMode.HighQuality;
using (var wrapMode = new ImageAttributes())
{
wrapMode.SetWrapMode(WrapMode.TileFlipXY);
graphics.DrawImage(image, innerRect, 0, 0, image.Width, image.Height, GraphicsUnit.Pixel, wrapMode);
}
fillMargins(graphics, width, height, innerRect, Brushes.Black);
}
return(destImage);
}
public void With_same_dimensions_They_are_kept()
{
Assert.IsTrue(ResizeMath
.KeepRatio(300, 200, 300, 200)
.SameAs(0, 0, 300, 200));
}
public void With_different_ratio_X_ration_is_adjusted()
{
Assert.IsTrue(ResizeMath
.KeepRatio(300, 200, 280, 100)
.SameAs(65, 0, 150, 100));
}
public void With_different_ratio_Y_ration_is_adjusted()
{
Assert.IsTrue(ResizeMath
.KeepRatio(300, 200, 75, 75)
.SameAs(0, 12, 75, 50));
}
public void It_does_not_scale_up()
{
Assert.IsTrue(ResizeMath
.KeepRatio(300, 200, 400, 300)
.SameAs(50, 50, 300, 200));
}
public void With_same_ratio_Destination_dimensions_are_kept()
{
Assert.IsTrue(ResizeMath
.KeepRatio(300, 200, 150, 100)
.SameAs(0, 0, 150, 100));
}
