imageutil.java

手机RPG游戏

package main;
import javax.microedition.lcdui.*;

public class ImageUtil
{

    private static final int FP_SHIFT = 13;
    private static final int FP_ONE = 1 << FP_SHIFT;
    private static final int FP_HALF = 1 << (FP_SHIFT - 1);
  private  static int[] getPixels(Image src)
    {
        int w = src.getWidth();
        int h = src.getHeight();
        int[] pixels = new int[w * h];
        src.getRGB(pixels, 0, w, 0, 0, w, h);
        return pixels;
    }

  private static Image drawPixels(int[] pixels, int w, int h)
    {
        return Image.createRGBImage(pixels, w, h, true);
    }

  public static Image resizeImage(Image src, int destW, int destH)
    {
        int srcW = src.getWidth();
        int srcH = src.getHeight();
        int[] destPixels = new int[destW * destH];
        int[] srcPixels = getPixels(src);
         for (int destY = 0; destY < destH; ++destY)
            {
                for (int destX = 0; destX < destW; ++destX)
                {
                    int srcX = (destX * srcW) / destW;
                    int srcY = (destY * srcH) / destH;
                    destPixels[destX + destY * destW] = srcPixels[srcX + srcY
                            * srcW];
                }
            }
        return drawPixels(destPixels, destW, destH);
    }

}