private static IReadOnlyCollection <ImageSizeParam> ParseImageSizeParameters(HttpRequestMessage request)
{
NameValueCollection queryString = request.RequestUri.ParseQueryString();
string[] sizeParams = queryString.GetValues("size");
if (sizeParams == null || sizeParams.Length == 0)
{
throw new ArgumentException {
Data = { { "ValidationData", new { Query = new { Size = "Required" } } } }
}
}
;
return(sizeParams.Select(sizeParam =>
{
if (!ImageSizeParam.TryParse(sizeParam, out ImageSizeParam size))
{
throw new ArgumentException {
Data = { { "ValidationData", new { Query = new { Size = "Incorrect size format. It should be \"${width}x${height}q${quality}\"" } } } }
}
}
;
return size;
}).ToList());
}
public void ShouldParseParameters(string input, int?width, int?height, int quality)
{
ImageSizeParam sizes = ImageSizeParam.Parse(input);
Assert.Equal(sizes.Width, width);
Assert.Equal(sizes.Height, height);
Assert.Equal(sizes.Quality, quality);
}
public OutputImageParameters Resize(InputImageParameters inputImage, ImageSizeParam targetSize)
{
using (SKBitmap original = SKBitmap.Decode(inputImage.InputStream))
{
if (original == null)
{
throw new ArgumentException {
Data = { { "ValidationData", new { Body = new { Image = "Something wrong with incoming image" } } } }
}
}
;
return(Resize(original, inputImage, targetSize));
}
}
private OutputImageParameters Resize(SKBitmap original, InputImageParameters inputImage, ImageSizeParam targetSize)
{
OutputImageParameters outputImage = CalculateSize(original.Width, original.Height, targetSize, inputImage.MinimumDifference);
ApplyResize(original, inputImage, outputImage);
return(outputImage);
}
private OutputImageParameters CalculateSize(int originalWidth, int originalHeight, ImageSizeParam targetSize, double minimumDifference)
{
int width;
int height;
if (targetSize.Width.HasValue || targetSize.Height.HasValue)
{
int widthDifference = originalWidth - (targetSize.Width ?? (int.MinValue / 2));
int heightDifference = originalHeight - (targetSize.Height ?? (int.MinValue / 2));
double difference = Math.Min((double)widthDifference / originalWidth, (double)heightDifference / originalHeight);
if (difference < minimumDifference)
{
return(OutputImageParameters.NotResized);
}
if (widthDifference < heightDifference)
{
width = targetSize.Width.Value;
height = (int)Math.Round((double)originalHeight * width / originalWidth);
}
else
{
height = targetSize.Height.Value;
width = (int)Math.Round((double)originalWidth * height / originalHeight);
}
}
else
{
width = originalWidth;
height = originalHeight;
}
return(new OutputImageParameters(width, height, targetSize.Quality));
}
public void ShouldConvertToCorrectString(int?width, int?height, int quality, string output)
{
ImageSizeParam size = new ImageSizeParam(width, height, quality);
Assert.Equal(size.ToString(), output);
}
public void ShouldFailForWrongParameters(string input)
{
bool parsed = ImageSizeParam.TryParse(input, out ImageSizeParam size);
Assert.False(parsed);
}