private static void CropImage(ImageCustomization imageCustomization, IMagickImage magickImage)
{
var cropWidth = Math.Abs(imageCustomization.X2 - imageCustomization.X1);
var cropHeight = Math.Abs(imageCustomization.Y2 - imageCustomization.Y1);
if ((cropWidth <= 0 || cropHeight <= 0) || cropWidth == magickImage.BaseWidth && cropHeight == magickImage.BaseHeight)
{
return;
}
else
{
var magickGeometry = new MagickGeometry(cropWidth, cropHeight)
{
IgnoreAspectRatio = false, //保持长宽比
FillArea = false,
X = imageCustomization.X1,
Y = imageCustomization.Y1
};
magickImage.Crop(magickGeometry);
}
}
public async Task <Result <MongoDBImageSaveOutput> > SaveImageToMongoDBAsync(string hostName, ContentBasedImageSaveInput contentBasedImageInput)
{
var hostConfig = _mongoDBHostConfigs.FirstOrDefault(x => x.HostName.Equals(hostName, StringComparison.OrdinalIgnoreCase));
if (hostConfig == null)
{
return(Result.FromError <MongoDBImageSaveOutput>($"HostName:{hostName}无可匹配的HostConfig项"));
}
else
{
var imageInfo = new MagickImageInfo(contentBasedImageInput.ImageBytes);
var imageCustomization = new ImageCustomization
{
X1 = contentBasedImageInput.X1 ?? 0,
X2 = contentBasedImageInput.X2 ?? imageInfo.Width,
Y1 = contentBasedImageInput.Y1 ?? 0,
Y2 = contentBasedImageInput.Y2 ?? imageInfo.Height
};
imageCustomization.ComputeHash();
var contentHash = contentBasedImageInput.Base64String.ToMD5HashString();
var imageMetadata = await _imageMetadataRepository.GetByContentHashAsync(contentHash);
if (imageMetadata != null && imageMetadata.Customizations.Any(x => x.Hash == imageCustomization.Hash))
{
var imageSaveOutput = new MongoDBImageSaveOutput {
Id = imageMetadata.Id, ContentHash = contentHash, MetaHash = imageCustomization.Hash
};
return(Result.FromError(imageSaveOutput, "已经存在该图片信息，请勿重复提交"));
}
else if (imageMetadata != null)//只保存原数据信息即可
{
imageMetadata.Customizations.Add(imageCustomization);
await _imageMetadataRepository.UpdateAsync(imageMetadata);
var imageSaveOutput = new MongoDBImageSaveOutput {
Id = imageMetadata.Id, ContentHash = contentHash, MetaHash = imageCustomization.Hash
};
return(Result.FromData(imageSaveOutput));
}
else//需要同时保存图片信息与原数据信息
{
var gridFSBucket = GetGridFSBucket(hostConfig);
var fileId = await gridFSBucket.UploadFromBytesAsync(contentBasedImageInput.Title, contentBasedImageInput.ImageBytes);
imageMetadata = new ImageMetadata
{
Id = fileId,
ContentHash = contentHash,
Title = contentBasedImageInput.Title,
Description = contentBasedImageInput.Description,
Customizations = new List <ImageCustomization>()
};
imageMetadata.Customizations.Add(imageCustomization);
await _imageMetadataRepository.InsertAsync(imageMetadata);
return(Result.FromData(new MongoDBImageSaveOutput {
Id = fileId, ContentHash = contentHash, MetaHash = imageCustomization.Hash
}));
}
}
}
