protected override unsafe void FitSurfaceImpl(SurfaceBase source)
{
float lastRowIndex = height - 1;
float lastColumnIndex = width - 1;
IntPtr srcColCachePtr = IntPtr.Zero;
try
{
srcColCachePtr = ImageSurfaceMemory.Allocate((ulong)width * sizeof(float));
float *srcColCache = (float *)srcColCachePtr;
// Precompute the source column indexes.
for (int x = 0; x < width; x++)
{
float u = x / lastColumnIndex;
srcColCache[x] = (u * source.Width) - 0.5f;
}
for (int y = 0; y < height; y++)
{
ColorCmyk8 *destRow = (ColorCmyk8 *)GetRowAddressUnchecked(y);
float v = y / lastRowIndex;
float srcY = (v * source.Height) - 0.5f;
int yint = (int)srcY;
float yfract = srcY - (float)Math.Floor(srcY);
for (int x = 0; x < width; x++)
{
float srcX = srcColCache[x];
int xint = (int)srcX;
float xfract = srcX - (float)Math.Floor(srcX);
// 1st row
ColorCmyk8 p00 = *(ColorCmyk8 *)source.GetPointAddressClamped(xint - 1, yint - 1);
ColorCmyk8 p10 = *(ColorCmyk8 *)source.GetPointAddressClamped(xint + 0, yint - 1);
ColorCmyk8 p20 = *(ColorCmyk8 *)source.GetPointAddressClamped(xint + 1, yint - 1);
ColorCmyk8 p30 = *(ColorCmyk8 *)source.GetPointAddressClamped(xint + 2, yint - 1);
// 2nd row
ColorCmyk8 p01 = *(ColorCmyk8 *)source.GetPointAddressClamped(xint - 1, yint + 0);
ColorCmyk8 p11 = *(ColorCmyk8 *)source.GetPointAddressClamped(xint + 0, yint + 0);
ColorCmyk8 p21 = *(ColorCmyk8 *)source.GetPointAddressClamped(xint + 1, yint + 0);
ColorCmyk8 p31 = *(ColorCmyk8 *)source.GetPointAddressClamped(xint + 2, yint + 0);
// 3rd row
ColorCmyk8 p02 = *(ColorCmyk8 *)source.GetPointAddressClamped(xint - 1, yint + 1);
ColorCmyk8 p12 = *(ColorCmyk8 *)source.GetPointAddressClamped(xint + 0, yint + 1);
ColorCmyk8 p22 = *(ColorCmyk8 *)source.GetPointAddressClamped(xint + 1, yint + 1);
ColorCmyk8 p32 = *(ColorCmyk8 *)source.GetPointAddressClamped(xint + 2, yint + 1);
// 4th row
ColorCmyk8 p03 = *(ColorCmyk8 *)source.GetPointAddressClamped(xint - 1, yint + 2);
ColorCmyk8 p13 = *(ColorCmyk8 *)source.GetPointAddressClamped(xint + 0, yint + 2);
ColorCmyk8 p23 = *(ColorCmyk8 *)source.GetPointAddressClamped(xint + 1, yint + 2);
ColorCmyk8 p33 = *(ColorCmyk8 *)source.GetPointAddressClamped(xint + 2, yint + 2);
float cyan0 = BicubicUtil.CubicHermite(p00.C, p10.C, p20.C, p30.C, xfract);
float cyan1 = BicubicUtil.CubicHermite(p01.C, p11.C, p21.C, p31.C, xfract);
float cyan2 = BicubicUtil.CubicHermite(p02.C, p12.C, p22.C, p32.C, xfract);
float cyan3 = BicubicUtil.CubicHermite(p03.C, p13.C, p23.C, p33.C, xfract);
float cyan = BicubicUtil.CubicHermite(cyan0, cyan1, cyan2, cyan3, yfract);
float magenta0 = BicubicUtil.CubicHermite(p00.M, p10.M, p20.M, p30.M, xfract);
float magenta1 = BicubicUtil.CubicHermite(p01.M, p11.M, p21.M, p31.M, xfract);
float magenta2 = BicubicUtil.CubicHermite(p02.M, p12.M, p22.M, p32.M, xfract);
float magenta3 = BicubicUtil.CubicHermite(p03.M, p13.M, p23.M, p33.M, xfract);
float magenta = BicubicUtil.CubicHermite(magenta0, magenta1, magenta2, magenta3, yfract);
float yellow0 = BicubicUtil.CubicHermite(p00.Y, p10.Y, p20.Y, p30.Y, xfract);
float yellow1 = BicubicUtil.CubicHermite(p01.Y, p11.Y, p21.Y, p31.Y, xfract);
float yellow2 = BicubicUtil.CubicHermite(p02.Y, p12.Y, p22.Y, p32.Y, xfract);
float yellow3 = BicubicUtil.CubicHermite(p03.Y, p13.Y, p23.Y, p33.Y, xfract);
float yellow = BicubicUtil.CubicHermite(yellow0, yellow1, yellow2, yellow3, yfract);
float black0 = BicubicUtil.CubicHermite(p00.K, p10.K, p20.K, p30.K, xfract);
float black1 = BicubicUtil.CubicHermite(p01.K, p11.K, p21.K, p31.K, xfract);
float black2 = BicubicUtil.CubicHermite(p02.K, p12.K, p22.K, p32.K, xfract);
float black3 = BicubicUtil.CubicHermite(p03.K, p13.K, p23.K, p33.K, xfract);
float black = BicubicUtil.CubicHermite(black0, black1, black2, black3, yfract);
destRow->C = (byte)FloatUtil.Clamp(cyan, 0, 255);
destRow->M = (byte)FloatUtil.Clamp(magenta, 0, 255);
destRow->Y = (byte)FloatUtil.Clamp(yellow, 0, 255);
destRow->K = (byte)FloatUtil.Clamp(black, 0, 255);
destRow++;
}
}
}
finally
{
if (srcColCachePtr != IntPtr.Zero)
{
ImageSurfaceMemory.Free(srcColCachePtr);
srcColCachePtr = IntPtr.Zero;
}
}
}
