private static bool IsHorizontalLineWithColor(LockedBitmapData data, int y, Color color, IColorComparer comparer)
{
for (int x = 0; x < data.Bitmap.Width; x++)
{
if (!comparer.Compare(data.GetPixel(x, y), color))
{
return(false);
}
}
return(true);
}
/// <summary>
/// Applies a transformation to each pixel of a bitmap.
/// </summary>
public static void TransformPixels(Bitmap bitmap, Func <Color, Color> transformFunc)
{
using (var data = new LockedBitmapData(bitmap, writeable: true))
{
for (int y = 0; y < bitmap.Height; y++)
{
for (int x = 0; x < bitmap.Width; x++)
{
data.SetPixel(x, y, transformFunc(data.GetPixel(x, y)));
}
}
}
}
private static int GetVerticalLineLength(LockedBitmapData data, int x, int startY, Func <Color, bool> predicate)
{
int y;
for (y = startY; y < data.Bitmap.Height; y++)
{
if (!predicate(data.GetPixel(x, y)))
{
break;
}
}
return(y - startY);
}
/// <summary>
/// Same as FindFirstPoint but the search begins at the bottom right and proceeds backwards.
/// </summary>
public static Point?FindLastPoint(Bitmap bitmap, Rectangle searchRect, Func <Color, bool> predicate)
{
using (var data = new LockedBitmapData(bitmap))
{
for (int y = searchRect.Bottom - 1; y >= searchRect.Top; y--)
{
for (int x = searchRect.Right - 1; x >= searchRect.Left; x--)
{
if (predicate(data.GetPixel(x, y)))
{
return(new Point(x, y));
}
}
}
}
return(null);
}
private static int CalculateBitmapRectDifference(LockedBitmapData data1, Point offset1, LockedBitmapData data2, Point offset2, Size size, IColorComparer comparer, int?maxDifference = null)
{
int diffs = 0;
for (int y = 0; y < size.Height; y++)
{
for (int x = 0; x < size.Width; x++)
{
var col1 = data1.GetPixel(x + offset1.X, y + offset1.Y);
var col2 = data2.GetPixel(x + offset2.X, y + offset2.Y);
if (!comparer.Compare(col1, col2))
{
diffs++;
if (maxDifference.HasValue && diffs > maxDifference.Value)
{
return(diffs);
}
}
}
}
return(diffs);
}