public HandledImage Cut(HandledImageRequest request)
{
Image initImage = Image.FromStream(request.ImageStream, true);
if (initImage.Width <= request.ImgSize.Width
&& initImage.Height <= request.ImgSize.Height)
{
return new HandledImage()
{
Img = initImage,
Name = request.SrcName
};
}
double templateRate = (double)request.ImgSize.Width / (double)request.ImgSize.Height;
double initRate = (double)initImage.Width / (double)initImage.Height;
if(templateRate == initRate)
{
// 等比例缩放
return ScaleCut(request, initImage);
}
else if(templateRate > initRate)
{
return HeightCut(request, initImage, templateRate);
}
else
{
return WidthCut(request, initImage, templateRate);
}
}
public List<HandledImageResponse> CutImg(string vpath, string ppath)
{
// load file
bool fileExists = File.Exists(ppath);
if (!fileExists) return null;
List<HandledImageResponse> imgPaths = new List<HandledImageResponse>();
string pdirStr = GetDirectory(ppath);
string vdirStr = GetVirtualDirectory(vpath);
HandledImageRequest request = new HandledImageRequest();
request.ImageStream = File.OpenRead(ppath);
request.Quality = 100;
request.SrcName = GetFileName(ppath);
foreach (var imgsize in _imgsizes)
{
request.ImgSize = imgsize;
var ret = _imgProvider.Cut(request);
if(ret != null && ret.Img != null && !string.IsNullOrWhiteSpace(ret.Name))
{
// store file
string scaleFilePath = string.Format("{0}\\{1}.jpg", pdirStr, ret.Name);
ret.Img.Save(scaleFilePath, ImageFormat.Jpeg);
ret.Img.Dispose();
string scaleVisualFilePath = string.Format("{0}/{1}.jpg", vdirStr, ret.Name);
imgPaths.Add(new HandledImageResponse() { ImgSize = imgsize, ImgUrl = scaleVisualFilePath });
}
}
request.ImageStream.Close();
return imgPaths;
}
private HandledImage ScaleCut(HandledImageRequest request, Image initImage)
{
Image templateImg = new Bitmap(request.ImgSize.Width, request.ImgSize.Height);
Graphics templateGph = Graphics.FromImage(templateImg);
templateGph.InterpolationMode = InterpolationMode.High;
templateGph.SmoothingMode = SmoothingMode.HighQuality;
templateGph.Clear(Color.White);
templateGph.DrawImage(initImage, new Rectangle(0, 0, request.ImgSize.Width, request.ImgSize.Height),
new Rectangle(0, 0, initImage.Width, initImage.Height), GraphicsUnit.Pixel);
templateGph.Dispose();
initImage.Dispose();
return new HandledImage()
{
Img = templateImg,
Name = string.Format(request.SrcName + "_{0}_{1}_{2}", request.ImgSize.Width, request.ImgSize.Height, request.Quality),
};
}
private HandledImage HeightCut(HandledImageRequest request,Image initImage, double templateRate)
{
int newHeight = (int)Math.Floor(initImage.Width / templateRate);
Image pickedImg = new Bitmap(initImage.Width, newHeight);
Graphics pickedGph = Graphics.FromImage(pickedImg);
Rectangle fromR = new Rectangle();
fromR.X = 0; fromR.Y = (int)Math.Floor((double)(initImage.Height - newHeight) / 2);
fromR.Width = initImage.Width; fromR.Height = newHeight;
Rectangle toR = new Rectangle();
toR.X = 0; toR.Y = 0;
toR.Width = initImage.Width; toR.Height = newHeight;
// 裁减
pickedGph.DrawImage(initImage, toR, fromR, GraphicsUnit.Pixel);
pickedGph.Dispose();
initImage.Dispose();
return ScaleCut(request, pickedImg);
}