public static Rectangle FindAutoCropRectangle(Image image, int cropDifference)
{
Rectangle cropRectangle = Rectangle.Empty;
Rectangle currentRectangle = Rectangle.Empty;
List <Point> checkPoints = new List <Point>();
// Top Left
checkPoints.Add(new Point(0, 0));
// Bottom Left
checkPoints.Add(new Point(0, image.Height - 1));
// Top Right
checkPoints.Add(new Point(image.Width - 1, 0));
// Bottom Right
checkPoints.Add(new Point(image.Width - 1, image.Height - 1));
using (IFastBitmap fastBitmap = FastBitmap.Create((Bitmap)image)) {
// find biggest area
foreach (Point checkPoint in checkPoints)
{
currentRectangle = FastBitmapOperator.FindAutoCropRectangle(fastBitmap, checkPoint, cropDifference);
if (currentRectangle.Width * currentRectangle.Height > cropRectangle.Width * cropRectangle.Height)
{
cropRectangle = currentRectangle;
}
}
}
return(cropRectangle);
}
private void ApplyBoxBlur(Bitmap destinationBitmap, int range)
{
// We only need one fastbitmap as we use it as source and target (the reading is done for one line H/V, writing after "parsing" one line H/V)
using (IFastBitmap fastBitmap = FastBitmap.Create(destinationBitmap)) {
FastBitmapOperator.ApplyBoxBlur(fastBitmap, range);
}
}
public Image Blur(Image sourceImage, int radius)
{
if (sourceImage == null)
{
return(sourceImage);
}
using (IFastBitmap fastBitmap = FastBitmap.CreateCloneOf(sourceImage)) {
FastBitmapOperator.ApplyBoxBlur(fastBitmap, radius);
Bitmap bmp = new Bitmap(sourceImage.Width, sourceImage.Height, sourceImage.PixelFormat);
using (Graphics graphics = Graphics.FromImage(bmp)) {
fastBitmap.DrawTo(graphics, Point.Empty);
}
return(bmp);
}
}
