static MyColor GetApproximateColor_Bicubic(BufferReader4 reader, double cx, double cy)
{
byte[] rBuffer = new byte[16];
byte[] gBuffer = new byte[16];
byte[] bBuffer = new byte[16];
byte[] aBuffer = new byte[16];
//nearest neighbor
if (reader.CurrentX > 2 && reader.CurrentY > 2 &&
reader.CurrentX < reader.Width - 2 &&
reader.CurrentY < reader.Height - 2)
{
//read 4 point sample
MyColor[] colors = new MyColor[16];
reader.SetStartPixel((int)cx, (int)cy);
reader.Read16(colors);
double x0 = (int)cx;
double x1 = (int)(cx + 1);
double xdiff = cx - x0;
double y0 = (int)cy;
double y1 = (int)(cy + 1);
double ydiff = cy - y0;
SeparateByChannel(colors, rBuffer, gBuffer, bBuffer, aBuffer);
double result_B = myInterpolator.getValueBytes(bBuffer, xdiff, ydiff);
double result_G = myInterpolator.getValueBytes(gBuffer, xdiff, ydiff);
double result_R = myInterpolator.getValueBytes(rBuffer, xdiff, ydiff);
double result_A = myInterpolator.getValueBytes(aBuffer, xdiff, ydiff);
//clamp
if (result_B > 255)
{
result_B = 255;
}
else if (result_B < 0)
{
result_B = 0;
}
if (result_G > 255)
{
result_G = 255;
}
else if (result_G < 0)
{
result_G = 0;
}
if (result_R > 255)
{
result_R = 255;
}
else if (result_R < 0)
{
result_R = 0;
}
if (result_A > 255)
{
result_A = 255;
}
else if (result_A < 0)
{
result_A = 0;
}
return(new MyColor((byte)result_R, (byte)result_G, (byte)result_B, (byte)result_A));
}
else
{
return(reader.ReadOnePixel());
}
}
ActualImage GetTransformedBicubicInterpolation()
{
//4 points sampling
//weight between four point
PointF ptInPlane = new PointF();
int x1, x2, y1, y2;
double dab, dbc, dcd, dda;
float dx1, dx2, dy1, dy2, dx1y1, dx1y2, dx2y1, dx2y2;
int rectWidth = rect.Width;
int rectHeight = rect.Height;
var ab_vec = this.AB;
var bc_vec = this.BC;
var cd_vec = this.CD;
var da_vec = this.DA;
byte[] buffer = srcCB.GetBuffer();
int stride = srcCB.Stride;
int bmpWidth = srcCB.Width;
int bmpHeight = srcCB.Height;
BufferReader4 reader = new BufferReader4(buffer, stride, bmpWidth, bmpHeight);
MyColor[] pixelBuffer = new MyColor[16];
byte[] sqPixs = new byte[16];
//Bitmap outputbmp = new Bitmap(rectWidth, rectHeight, System.Drawing.Imaging.PixelFormat.Format32bppArgb);
////-----------------------------------------------
//var bmpdata2 = outputbmp.LockBits(new Rectangle(0, 0, rectWidth, rectHeight),
// System.Drawing.Imaging.ImageLockMode.ReadWrite, outputbmp.PixelFormat);
////-----------------------------------------
ActualImage destCB = new ActualImage(rect.Width, rect.Height, PixelFormat.Rgba32);
MyImageReaderWriter destWriter = new MyImageReaderWriter(destCB);
//PointF ptInPlane = new PointF();
//int stride2 = bmpdata2.Stride;
//byte[] outputBuffer = new byte[stride2 * outputbmp.Height];
// int targetPixelIndex = 0;
// int startLine = 0;
int rectLeft = this.rect.Left;
int rectTop = this.rect.Top;
for (int y = 0; y < rectHeight; ++y)
{
for (int x = 0; x < rectWidth; ++x)
{
PointF srcPt = new PointF(x, y);
srcPt.Offset(rectLeft, rectTop);
if (!IsOnPlaneABCD(srcPt))
{
continue;
}
//-------------------------------------
dab = Math.Abs(new Vector(vertex[0], srcPt).CrossProduct(ab_vec));
dbc = Math.Abs(new Vector(vertex[1], srcPt).CrossProduct(bc_vec));
dcd = Math.Abs(new Vector(vertex[2], srcPt).CrossProduct(cd_vec));
dda = Math.Abs(new Vector(vertex[3], srcPt).CrossProduct(da_vec));
ptInPlane.X = (float)(srcW * (dda / (dda + dbc)));
ptInPlane.Y = (float)(srcH * (dab / (dab + dcd)));
x1 = (int)ptInPlane.X;
y1 = (int)ptInPlane.Y;
if (x1 >= 2 && x1 < srcW - 2 && y1 >= 2 && y1 < srcH - 2)
{
reader.SetStartPixel(x1, y1);
reader.Read16(pixelBuffer);
//do interpolate
//find src pixel and approximate
MyColor color = GetApproximateColor_Bicubic(reader,
ptInPlane.X,
ptInPlane.Y);
//outputBuffer[targetPixelIndex] = (byte)color.b;
//outputBuffer[targetPixelIndex + 1] = (byte)color.g;
//outputBuffer[targetPixelIndex + 2] = (byte)color.r;
//outputBuffer[targetPixelIndex + 3] = (byte)color.a;
//targetPixelIndex += 4;
destWriter.SetPixel(x, y, new ColorRGBA(color.b, color.g, color.r, color.a));
}
}
//newline
// startLine += stride2;
//targetPixelIndex = startLine;
}
//------------------------
//System.Runtime.InteropServices.Marshal.Copy(
//outputBuffer, 0,
//bmpdata2.Scan0, outputBuffer.Length);
//outputbmp.UnlockBits(bmpdata2);
////outputbmp.Save("d:\\WImageTest\\n_lion_bicubic.png");
//return outputbmp;
return(destCB);
}