src/main/java/org/linaro/benchmarks/TestRGBToCmyk.java


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package org.linaro.benchmarks;

import org.openjdk.jmh.annotations.*;
import java.util.concurrent.TimeUnit;

@BenchmarkMode(Mode.AverageTime)
@OutputTimeUnit(TimeUnit.MICROSECONDS)
@State(Scope.Benchmark)

public class TestRGBToCmyk
{
  static final int LENGTH = 256 * 1024;
  static byte input[] = new byte[LENGTH*3];
  static byte output[] = new byte[LENGTH*4];

  public static void TestRGBToCmykInit()
  {
    for (int i = 0; i < LENGTH*3; i++) {
      input[i] = (byte)i;
    }
  }

  public static void RGBToCmyk(byte[] rgb, byte[] cmyk, int cnt)
  {
    int i;
    int c, m, y, k;
    for (i = 0; i < cnt; i++) {
      /* calculate complementary colors */
      c = 255 - rgb[i*3];
      m = 255 - rgb[i*3+1];
      y = 255 - rgb[i*3+2];
      /* find the black level k */
      k = Math.min(Math.min(c, m), y);
      /* correct complementary color lever based on k */
      cmyk[i*4] = (byte)(c - k);
      cmyk[i*4+1] = (byte)(m - k);
      cmyk[i*4+2] = (byte)(y - k);
      cmyk[i*4+3] = (byte)(k);
    }
  }

  @Setup
  public void setup()
  {
    TestRGBToCmykInit();
  }

  @Benchmark
  public void testRGBToCmyk() {
    RGBToCmyk(input, output, LENGTH);
  }

}