www in docker support

decompiled-libs/www/acxent-videoj-1.0.0/org/jcodec/scale/LanczosResampler.java

@@ -0,0 +1,61 @@
+package org.jcodec.scale;
+
+import org.jcodec.common.model.Size;
+
+public class LanczosResampler extends BaseResampler {
+  private static final int _nTaps = 6;
+  
+  private int precision = 256;
+  
+  private short[][] tapsXs;
+  
+  private short[][] tapsYs;
+  
+  private double _scaleFactorX;
+  
+  private double _scaleFactorY;
+  
+  public LanczosResampler(Size from, Size to) {
+    super(from, to);
+    this._scaleFactorX = (double)to.getWidth() / (double)from.getWidth();
+    this._scaleFactorY = (double)to.getHeight() / (double)from.getHeight();
+    this.tapsXs = new short[this.precision][6];
+    this.tapsYs = new short[this.precision][6];
+    buildTaps(6, this.precision, this._scaleFactorX, this.tapsXs);
+    buildTaps(6, this.precision, this._scaleFactorY, this.tapsYs);
+  }
+  
+  private static double sinc(double x) {
+    return (x == 0.0D) ? 1.0D : (Math.sin(x) / x);
+  }
+  
+  private static void buildTaps(int nTaps, int precision, double scaleFactor, short[][] tapsOut) {
+    double[] taps = new double[nTaps];
+    for (int i = 0; i < precision; i++) {
+      double o = (double)i / (double)precision;
+      for (int j = -nTaps / 2 + 1, t = 0; j < nTaps / 2 + 1; j++, t++) {
+        double x = -o + (double)j;
+        double sinc_val = scaleFactor * sinc(scaleFactor * x * Math.PI);
+        double wnd_val = Math.sin(x * Math.PI / (double)(nTaps - 1) + 1.5707963267948966D);
+        taps[t] = sinc_val * wnd_val;
+      } 
+      normalizeAndGenerateFixedPrecision(taps, 7, tapsOut[i]);
+    } 
+  }
+  
+  protected short[] getTapsX(int dstX) {
+    int oi = (int)((double)(float)(dstX * this.precision) / this._scaleFactorX);
+    int sub_pel = oi % this.precision;
+    return this.tapsXs[sub_pel];
+  }
+  
+  protected short[] getTapsY(int dstY) {
+    int oy = (int)((double)(float)(dstY * this.precision) / this._scaleFactorY);
+    int sub_pel = oy % this.precision;
+    return this.tapsYs[sub_pel];
+  }
+  
+  protected int nTaps() {
+    return 6;
+  }
+}