public void InvertColors()
{
storeTransformedBitmap();
cancellationTokenSource = new CancellationTokenSource();
int currentPerecentageCompleted = 0;
int numberOfPixelsEdited = onePercentOfArea;
for (int y = 0; y < TransformedBitmap.Height; y++)
{
for (int x = 0; x < TransformedBitmap.Width; x++)
{
if (cancellationTokenSource.Token.IsCancellationRequested)
{
undoImageChanges();
return;
}
Color newColor = getNewColorForInversionTransformation(TransformedBitmap.GetPixel(x, y));
TransformedBitmap.SetPixel(x, y, newColor);
updateTransformationProgress(ref numberOfPixelsEdited, ref currentPerecentageCompleted);
}
}
storeTransformedBitmap();
}
public void ChangeBrightness(int brightness)
{
// The minimum value for the brightness is BRIGHTNESS_MIN_VALUE and the maximum value is BRIGHTNESS_MAX_VALUE. Lower values represent darkening the photo,
// and higher values represent brightening the photo. BRIGHTNESS_AVERAGE_VALUE represents no change.
if (brightness < BRIGHTNESS_MIN_VALUE || brightness > BRIGHTNESS_MAX_VALUE)
{
throw new ArgumentException("The value for brightness cannot be greater than 100 or less than 0. Current value = " + brightness);
}
storeTransformedBitmap();
cancellationTokenSource = new CancellationTokenSource();
int currentPerecentageCompleted = 0;
int numberOfPixelsEdited = onePercentOfArea;
int amountToSubtractFromRgbValue = calculateAmountToSubtractFromRgbValue(brightness);
for (int y = 0; y < TransformedBitmap.Height; y++)
{
for (int x = 0; x < TransformedBitmap.Width; x++)
{
if (cancellationTokenSource.Token.IsCancellationRequested)
{
undoImageChanges();
return;
}
Color newColor = getNewColorForBrightnessTransform(amountToSubtractFromRgbValue, TransformedBitmap.GetPixel(x, y));
TransformedBitmap.SetPixel(x, y, newColor);
updateTransformationProgress(ref numberOfPixelsEdited, ref currentPerecentageCompleted);
}
}
storeTransformedBitmap();
}
private double calculateAverageRgbValuesForPixel(int x, int y)
{
Color color = TransformedBitmap.GetPixel(x, y);
return((color.R + color.G + color.B) / 3);
}