// 调整图片文件大小
private void ResizeImage()
{
UploadStatus = UploadStatus.Resizing;
using (Stream fileStream = m_file.OpenRead())
{
// 利用FluxJpeg解码
DecodedJpeg jpegIn = new JpegDecoder(fileStream).Decode();
if (ImageResizer.ResizeNeeded(jpegIn.Image, ImageSize))
{
// 调整
DecodedJpeg jpegOut = new DecodedJpeg(
new ImageResizer(jpegIn.Image).Resize(ImageSize, ResamplingFilters.NearestNeighbor)
, jpegIn.MetaHeaders); // 获取EXIF详细信息
// 编码
m_resizeStream = new MemoryStream();
new JpegEncoder(jpegOut, 90, m_resizeStream).Encode();
// 显示
m_resizeStream.Seek(0, SeekOrigin.Begin);
FileLength = m_resizeStream.Length;
}
}
}
void Resize()
{
Status = FileUploadStatus.Resizing;
try
{
Stream fileStream = file.OpenRead();
using (fileStream)
{
// Decode
DecodedJpeg jpegIn = new JpegDecoder(fileStream).Decode();
if (!ImageResizer.ResizeNeeded(jpegIn.Image, ImageSize))
{
return;
}
else
{
// Resize
DecodedJpeg jpegOut = new DecodedJpeg(
new ImageResizer(jpegIn.Image)
.Resize(ImageSize, ResamplingFilters.NearestNeighbor),
jpegIn.MetaHeaders); // Retain EXIF details
// Encode
resizeStream = new MemoryStream();
new JpegEncoder(jpegOut, 90, resizeStream).Encode();
// Display
resizeStream.Seek(0, SeekOrigin.Begin);
FileLength = resizeStream.Length;
}
}
}
catch { };
}
private void Button_Click(object sender, RoutedEventArgs e)
{
OpenFileDialog ofd = new OpenFileDialog()
{
Filter = "Image files (*.jpg)|*.jpg"
};
if (ofd.ShowDialog() != true)
{
return;
}
Stream fileStream = ofd.File.OpenRead();
// Display input image
Stream inStream = new MemoryStream(new BinaryReader(fileStream).ReadBytes((int)fileStream.Length));
BitmapImage imageIn = new BitmapImage();
imageIn.SetSource(inStream);
InputImage.Source = imageIn;
// Rewind
fileStream.Seek(0, SeekOrigin.Begin);
using (fileStream)
{
// Decode
DecodedJpeg jpegIn = new JpegDecoder(fileStream).Decode();
if (!ImageResizer.ResizeNeeded(jpegIn.Image, 320))
{
OutputImage.Source = null;
OutputText.Text = "No resize necessary.";
return;
}
// Resize
DecodedJpeg jpegOut = new DecodedJpeg(
new ImageResizer(jpegIn.Image)
.Resize(320, ResamplingFilters.NearestNeighbor),
jpegIn.MetaHeaders); // Retain EXIF details
// Encode
MemoryStream outStream = new MemoryStream();
new JpegEncoder(jpegOut, 90, outStream).Encode();
// Display
outStream.Seek(0, SeekOrigin.Begin);
BitmapImage image = new BitmapImage();
image.SetSource(outStream);
OutputImage.Source = image;
}
}
static Image Resize(string pathIn, int edge)
{
JpegDecoder decoder = new JpegDecoder(File.Open(pathIn, FileMode.Open));
DecodedJpeg jpeg = decoder.Decode();
if (ImageResizer.ResizeNeeded(jpeg.Image, edge))
{
ImageResizer resizer = new ImageResizer(jpeg.Image);
return(resizer.ResizeToScale(edge, ResamplingFilters.LowpassAntiAlias));
}
return(jpeg.Image);
}
