public override Bitmap Apply(Bitmap bmp)
{
Bitmap bmpResult = bmp.CreateEmptyBitmap();
using (UnsafeBitmap source = new UnsafeBitmap(bmp, true, ImageLockMode.ReadOnly))
using (UnsafeBitmap dest = new UnsafeBitmap(bmpResult, true, ImageLockMode.WriteOnly))
{
int right = source.Width - 1;
int bottom = source.Height - 1;
for (int y = 0; y < source.Height; y++)
{
for (int x = 0; x < source.Width; x++)
{
ColorBgra colorR = source.GetPixel(MathHelpers.Clamp(x - OffsetRed.X, 0, right), MathHelpers.Clamp(y - OffsetRed.Y, 0, bottom));
ColorBgra colorG = source.GetPixel(MathHelpers.Clamp(x - OffsetGreen.X, 0, right), MathHelpers.Clamp(y - OffsetGreen.Y, 0, bottom));
ColorBgra colorB = source.GetPixel(MathHelpers.Clamp(x - OffsetBlue.X, 0, right), MathHelpers.Clamp(y - OffsetBlue.Y, 0, bottom));
ColorBgra shiftedColor = new ColorBgra((byte)(colorB.Blue * colorB.Alpha / 255), (byte)(colorG.Green * colorG.Alpha / 255),
(byte)(colorR.Red * colorR.Alpha / 255), (byte)((colorR.Alpha + colorG.Alpha + colorB.Alpha) / 3));
dest.SetPixel(x, y, shiftedColor);
}
}
}
return(bmpResult);
}
public override Bitmap Apply(Bitmap bmp)
{
Bitmap bmpResult = bmp.CreateEmptyBitmap();
using (UnsafeBitmap source = new UnsafeBitmap(bmp, true, ImageLockMode.ReadOnly))
using (UnsafeBitmap dest = new UnsafeBitmap(bmpResult, true, ImageLockMode.WriteOnly))
{
for (int y = 0; y < dest.Height; y++)
{
for (int x = 0; x < dest.Width; x++)
{
ColorBgra colorR = source.GetPixel(MathHelpers.Clamp(x + OffsetRed.X, 0, dest.Width - 1), MathHelpers.Clamp(y + OffsetRed.Y, 0, dest.Height - 1));
ColorBgra colorG = source.GetPixel(MathHelpers.Clamp(x + OffsetGreen.X, 0, dest.Width - 1), MathHelpers.Clamp(y + OffsetGreen.Y, 0, dest.Height - 1));
ColorBgra colorB = source.GetPixel(MathHelpers.Clamp(x + OffsetBlue.X, 0, dest.Width - 1), MathHelpers.Clamp(y + OffsetBlue.Y, 0, dest.Height - 1));
byte colorR_alpha = colorR.Alpha;
byte colorG_alpha = colorG.Alpha;
byte colorB_alpha = colorB.Alpha;
byte colorA = (byte)(colorR_alpha / 3 + colorG_alpha / 3 + colorB_alpha / 3);
ColorBgra shiftedColor = new ColorBgra((byte)(colorB.Blue * colorB_alpha / 255), (byte)(colorG.Green * colorG_alpha / 255),
(byte)(colorR.Red * colorR_alpha / 255), colorA);
dest.SetPixel(x, y, shiftedColor);
}
}
}
return(bmpResult);
}
private Bitmap CreateTransparentImage(Bitmap whiteBackground, Bitmap blackBackground)
{
if (whiteBackground != null && blackBackground != null && whiteBackground.Size == blackBackground.Size)
{
Bitmap result = new Bitmap(whiteBackground.Width, whiteBackground.Height, PixelFormat.Format32bppArgb);
using (UnsafeBitmap whiteBitmap = new UnsafeBitmap(whiteBackground, true, ImageLockMode.ReadOnly))
using (UnsafeBitmap blackBitmap = new UnsafeBitmap(blackBackground, true, ImageLockMode.ReadOnly))
using (UnsafeBitmap resultBitmap = new UnsafeBitmap(result, true, ImageLockMode.WriteOnly))
{
int pixelCount = blackBitmap.PixelCount;
for (int i = 0; i < pixelCount; i++)
{
ColorBgra white = whiteBitmap.GetPixel(i);
ColorBgra black = blackBitmap.GetPixel(i);
double alpha = (black.Red - white.Red + 255) / 255.0;
if (alpha == 1)
{
resultBitmap.SetPixel(i, white);
}
else if (alpha > 0)
{
white.Blue = (byte)(black.Blue / alpha);
white.Green = (byte)(black.Green / alpha);
white.Red = (byte)(black.Red / alpha);
white.Alpha = (byte)(255 * alpha);
resultBitmap.SetPixel(i, white);
}
}
}
return(result);
}
return(whiteBackground);
}
private static Bitmap CreateTransparentImage(Bitmap whiteBackground, Bitmap blackBackground)
{
if (whiteBackground != null && blackBackground != null && whiteBackground.Size == blackBackground.Size)
{
Bitmap result = new Bitmap(whiteBackground.Width, whiteBackground.Height, PixelFormat.Format32bppArgb);
using (UnsafeBitmap whiteBitmap = new UnsafeBitmap(whiteBackground, true, ImageLockMode.ReadOnly))
using (UnsafeBitmap blackBitmap = new UnsafeBitmap(blackBackground, true, ImageLockMode.ReadOnly))
using (UnsafeBitmap resultBitmap = new UnsafeBitmap(result, true, ImageLockMode.WriteOnly))
{
int pixelCount = blackBitmap.PixelCount;
for (int i = 0; i < pixelCount; i++)
{
ColorBgra white = whiteBitmap.GetPixel(i);
ColorBgra black = blackBitmap.GetPixel(i);
double alpha = (black.Red - white.Red + 255) / 255.0;
if (alpha == 1)
{
resultBitmap.SetPixel(i, white);
}
else if (alpha > 0)
{
white.Blue = (byte)(black.Blue / alpha);
white.Green = (byte)(black.Green / alpha);
white.Red = (byte)(black.Red / alpha);
white.Alpha = (byte)(255 * alpha);
resultBitmap.SetPixel(i, white);
}
}
}
return result;
}
return whiteBackground;
}