private Task <StandardRgbBitmap> CreateSampledBitmap(StandardRgbBitmap source, float volumeAspectRatio, int totalVolumeCount)
{
return(Task.Run(() =>
{
// Determine the ideal width and height of each volume
// x * y = totalvolumeCount
// x * volumeAspectRatio / y = source.w / source.h
// => y = totalVolumeCount / x
// => x * x * volumeAspectRatio / totalVolumeCount = source.w / source.h
// => x ^ 2 = source.w / source.h * totalVolumeCount / volumeAspectRatio
// => y = sqrt(source.w / source.h * totalVolumeCount / volumeAspectRatio)
double targetWidth = Math.Sqrt((double)source.Width / source.Height * totalVolumeCount / volumeAspectRatio);
double targetHeight = totalVolumeCount / targetWidth;
int width = (int)targetWidth;
int height = (int)targetHeight;
int areaWidth = source.Width / width;
int areaHeight = source.Height / height;
int startX = (source.Width - width * areaWidth) / 2;
int startY = (source.Height - height * areaHeight) / 2;
StandardRgbColor[] pixels = new StandardRgbColor[width * height];
Parallel.For(0, width, targetX =>
{
for (int targetY = 0; targetY < height; targetY++)
{
ColorAverageAccumulator accumulator = new ColorAverageAccumulator();
for (int sourceX = startX + targetX * areaWidth; sourceX < startX + (targetX + 1) * areaWidth; sourceX++)
{
for (int sourceY = startY + targetY * areaHeight; sourceY < startY + (targetY + 1) * areaHeight; sourceY++)
{
accumulator.AddSample((Vector3)source.Pixels[sourceY * source.Width + sourceX].ToCieLab());
}
}
pixels[targetY * width + targetX] = ((CieLabColor)accumulator.GetAverage()).ToStandardRgb();
}
});
return new StandardRgbBitmap(pixels, width, height, source.DpiX, source.DpiY);
}));
}
private async void OpenMosaicImage(object sender, RoutedEventArgs e)
{
OpenFileDialog mosaicOpenFileDialog = new OpenFileDialog
{
Title = "Mosaic Image",
Filter = "Images|*.jpg;*.png",
InitialDirectory = Settings.Default.MosaicImagePath
};
if (mosaicOpenFileDialog.ShowDialog() == true)
{
Settings.Default.MosaicImagePath = Path.GetDirectoryName(mosaicOpenFileDialog.FileName);
Settings.Default.Save();
var originalImage = BitmapFrame.Create(new Uri(mosaicOpenFileDialog.FileName), BitmapCreateOptions.None, BitmapCacheOption.Default);
sampledBitmap = await CreateSampledBitmap(originalImage.ToStandardRgbBitmap(), averageAspectRatio, sources.Count);
var targetImage = sampledBitmap.ToBitmapSource();
SimplifiedBitmap.Source = targetImage;
SimplifiedBitmap.Width = targetImage.PixelWidth * 1.5;
SimplifiedBitmap.Height = targetImage.PixelHeight;
}
}
