private static Bitmap CropBitmapAndUnlok(FastBitmap bmp, Color backgroundColor)
{
int y = 0;
int x;
Color c = backgroundColor;
int backgroundArgb = backgroundColor.ToArgb();
// Crop top
while (y < bmp.Height && IsBackgroundColor(c, backgroundArgb))
{
c = bmp.GetPixel(0, y);
if (IsBackgroundColor(c, backgroundArgb))
{
for (x = 1; x < bmp.Width; x++)
{
c = bmp.GetPixelNext();
if (c.A != 0 && c.ToArgb() != backgroundArgb)
break;
}
}
if (IsBackgroundColor(c, backgroundArgb))
y++;
}
int minY = y;
if (minY > 3)
minY -= 3;
else
minY = 0;
// Crop left
x = 0;
c = backgroundColor;
while (x < bmp.Width && IsBackgroundColor(c, backgroundArgb))
{
for (y = minY; y < bmp.Height; y++)
{
c = bmp.GetPixel(x, y);
if (!IsBackgroundColor(c, backgroundArgb))
break;
}
if (IsBackgroundColor(c, backgroundArgb))
x++;
}
int minX = x;
if (minX > 3)
minX -= 3;
else
minX -= 0;
// Crop bottom
y = bmp.Height - 1;
c = backgroundColor;
while (y > minY && IsBackgroundColor(c, backgroundArgb))
{
c = bmp.GetPixel(0, y);
if (IsBackgroundColor(c, backgroundArgb))
{
for (x = 1; x < bmp.Width; x++)
{
c = bmp.GetPixelNext();
if (!IsBackgroundColor(c, backgroundArgb))
break;
}
}
if (IsBackgroundColor(c, backgroundArgb))
y--;
}
int maxY = y + 7;
if (maxY >= bmp.Height)
maxY = bmp.Height - 1;
// Crop right
x = bmp.Width - 1;
c = backgroundColor;
while (x > minX && IsBackgroundColor(c, backgroundArgb))
{
for (y = minY; y < bmp.Height; y++)
{
c = bmp.GetPixel(x, y);
if (!IsBackgroundColor(c, backgroundArgb))
break;
}
if (IsBackgroundColor(c, backgroundArgb))
x--;
}
int maxX = x + 7;
if (maxX >= bmp.Width)
maxX = bmp.Width - 1;
bmp.UnlockImage();
Bitmap bmpImage = bmp.GetBitmap();
if (bmpImage.Width > 1 && bmpImage.Height > 1 && maxX - minX > 0 && maxY - minY > 0)
{
Bitmap bmpCrop = bmpImage.Clone(new Rectangle(minX, minY, maxX - minX, maxY - minY), bmpImage.PixelFormat);
return bmpCrop;
}
return (Bitmap)bmpImage.Clone();
}