public Color DetectDominantColour(Bitmap image)
{
var calculator = new DominantHueColorCalculator();
var color = calculator.CalculateDominantColor(image);
return(color);
}
public Color DetectAverageColor(Bitmap image)
{
var calculator = new DominantHueColorCalculator();
var average = DominantColorUtils.GetAverageRGBColor(image);
return(average);
}
private static async Task <GalleryFolder> ProcessMediaInternalAsync(ILogger log, string name, string folder, string description)
{
log.LogInformation("C# HTTP process media trigger function processed a request.");
var storageAccount = CloudStorageAccount.Parse(Environment.GetEnvironmentVariable("AzureWebJobsStorage"));
var blobClient = storageAccount.CreateCloudBlobClient();
var srcContainer = blobClient.GetContainerReference("image-upload");
var container = blobClient.GetContainerReference("images");
JsonSerializerOptions options = new JsonSerializerOptions
{
PropertyNameCaseInsensitive = true,
PropertyNamingPolicy = JsonNamingPolicy.CamelCase
};
GalleryFolder root = new GalleryFolder()
{
Id = Guid.Empty.ToString()
};
// load images.json
var blob = container.GetBlockBlobReference(imagesJsonFilename);
if (blob != null)
{
if (await blob.ExistsAsync())
{
var body = await blob.DownloadTextAsync();
if (!string.IsNullOrWhiteSpace(body))
{
root = JsonSerializer.Deserialize <GalleryFolder>(body, options);
}
}
// load file
var f = srcContainer.GetBlockBlobReference(name);
using MemoryStream stream = new MemoryStream();
await f.DownloadToStreamAsync(stream).ConfigureAwait(true);
stream.Position = 0;
using var src = Image.Load(stream);
var id = Guid.NewGuid();
var hueCalc = new DominantHueColorCalculator(0.5f, 0.5f, 60);
var galleryImage = new GalleryImage()
{
Id = id,
DominantColour = "#" + hueCalc.CalculateDominantColor(src).ToHex(),
Files = new Dictionary <string, GalleryImageDetails>(),
Description = description
};
var resolutions = GetResolutions();
foreach (var key in resolutions.Keys)
{
galleryImage.Files[key] = await CreatePreviewImageAsync(
src.Clone(x => x.AutoOrient()),
key,
container,
id,
resolutions
);
}
if (!string.IsNullOrWhiteSpace(folder))
{
(GetFolderRecursive(root, folder) ?? root)
.Images.Add(galleryImage);
}
else
{
root.Images.Add(galleryImage);
}
// save images.json
var outputBody = JsonSerializer.Serialize(root, options);
await blob.UploadTextAsync(outputBody);
log.LogInformation("Updated images.json");
// delete original file
await f.DeleteAsync().ConfigureAwait(true);
}
return(root);
}
