/// <summary>
/// Rotates the bitmap in 90° steps clockwise and returns a new rotated WriteableBitmap.
/// </summary>
/// <param name="bmp">The WriteableBitmap.</param>
/// <param name="angle">The angle in degrees the bitmap should be rotated in 90° steps clockwise.</param>
/// <returns>A new WriteableBitmap that is a rotated version of the input.</returns>
public static BitmapBuffer Rotate(this BitmapBuffer bmp, FastRotateAngle angle)
{
using (BitmapContext context = bmp.GetBitmapContext(ReadWriteMode.ReadOnly))
{
// Use refs for faster access (really important!) speeds up a lot!
int w = context.Width;
int h = context.Height;
int[] p = context.Pixels;
int i = 0;
switch (angle)
{
default:
{
return(bmp.Clone());
}
case FastRotateAngle.Rotate90:
{
var result = BitmapBufferFactory.New(h, w);
using (BitmapContext destContext = result.GetBitmapContext())
{
var rp = destContext.Pixels;
for (int x = 0; x < w; x++)
{
for (int y = h - 1; y >= 0; y--)
{
int srcInd = y * w + x;
rp[i] = p[srcInd];
i++;
}
}
}
return(result);
}
case FastRotateAngle.Rotate180:
{
var result = BitmapBufferFactory.New(w, h);
using (BitmapContext destContext = result.GetBitmapContext())
{
var rp = destContext.Pixels;
for (int y = h - 1; y >= 0; y--)
{
for (int x = w - 1; x >= 0; x--)
{
int srcInd = y * w + x;
rp[i] = p[srcInd];
i++;
}
}
}
return(result);
}
case FastRotateAngle.Rotate270:
{
var result = BitmapBufferFactory.New(h, w);
using (BitmapContext destContext = result.GetBitmapContext())
{
int[] rp = destContext.Pixels;
for (int x = w - 1; x >= 0; x--)
{
for (int y = 0; y < h; y++)
{
int srcInd = y * w + x;
rp[i] = p[srcInd];
i++;
}
}
}
return(result);
}
}
}
}
