private void CropFromFile(string file, string path, int width, int height, CropAnchorPosition anchor, int quality)
{
using(FileStream imageContents = new FileStream(file, FileMode.Open, FileAccess.Read))
{
Image original = Image.FromStream(imageContents);
imageContents.Close();
CropToDimensions(ref original, path, width, height, anchor, quality);
}
}
public void SaveImageCropToDimensions(string file, string path, int width, int height, CropAnchorPosition anchor, int quality)
{
CropFromFile(file, path, width, height, anchor, quality);
}
private void CropToDimensions(ref Image original, string path, int width, int height, CropAnchorPosition anchor, int quality)
{
int sourceWidth = original.Width;
int sourceHeight = original.Height;
int sourceX = 0;
int sourceY = 0;
int destX = 0;
int destY = 0;
float nPercent = 0;
float nPercentW = ((float)width / (float)sourceWidth);
float nPercentH = ((float)height / (float)sourceHeight);
if(nPercentH < nPercentW)
{
nPercent = nPercentW;
switch(anchor)
{
case CropAnchorPosition.Top:
destY = 0;
break;
case CropAnchorPosition.Bottom:
destY = (int)(height - (sourceHeight * nPercent));
break;
default:
destY = (int)((height - (sourceHeight * nPercent)) / 2);
break;
}
}
else
{
nPercent = nPercentH;
switch(anchor)
{
case CropAnchorPosition.Left:
destX = 0;
break;
case CropAnchorPosition.Right:
destX = (int)(width - (sourceWidth * nPercent));
break;
default:
destX = (int)((width - (sourceWidth * nPercent)) / 2);
break;
}
}
// Adding one should cure the black border bug
int destWidth = (int)(sourceWidth * nPercent) + 1;
int destHeight = (int)(sourceHeight * nPercent) + 1;
Bitmap resized = new Bitmap(width, height, PixelFormat.Format24bppRgb);
resized.SetResolution(original.HorizontalResolution, original.VerticalResolution);
Graphics g = Graphics.FromImage(resized);
g.InterpolationMode = InterpolationMode.HighQualityBicubic;
g.SmoothingMode = SmoothingMode.HighQuality;
g.PixelOffsetMode = PixelOffsetMode.HighQuality;
g.CompositingQuality = CompositingQuality.HighQuality;
// Fixes the weird border bug
ImageAttributes attr = new ImageAttributes();
attr.SetWrapMode(WrapMode.TileFlipXY);
g.DrawImage(original,
new Rectangle(destX, destY, destWidth, destHeight),
sourceX, sourceY, sourceWidth, sourceHeight,
GraphicsUnit.Pixel, attr);
attr.Dispose();
g.Dispose();
ImageCodecInfo[] info = ImageCodecInfo.GetImageEncoders();
EncoderParameters encoderParameters = new EncoderParameters(1);
encoderParameters.Param[0] = new EncoderParameter(System.Drawing.Imaging.Encoder.Quality, (long)quality);
resized.Save(path, info[1], encoderParameters);
resized.Dispose();
return;
}
private void CropFromHttpPostedFileBase(HttpPostedFileBase file, string path, int width, int height, CropAnchorPosition anchor, int quality)
{
if(file.ContentLength < (_uploadmaxsize * 1024))
{
Image original = Image.FromStream(file.InputStream);
CropToDimensions(ref original, path, width, height, anchor, quality);
}
else
{
throw new Exception("File size was too large (upload: " + (file.ContentLength / 1024) + "kb, maximum " + _uploadmaxsize + "kb)");
}
}
public void SaveImageCropToDimensions(HttpPostedFileBase file, string path, int width, int height, CropAnchorPosition anchor)
{
CropFromHttpPostedFileBase(file, path, width, height, anchor, 100);
}
public void SaveImageCropToDimensions(MemoryStream file, string path, int width, int height, CropAnchorPosition anchor)
{
CropFromMemoryStream(file, path, width, height, anchor, 100);
}
