Android NDKでJNIを使用してアプリを高速化するには：Androidで動く携帯Javaアプリ作成入門（15）（1/3 ページ）

public void draw(Canvas canvas){
    synchronized (this) {
        Log.d("TIME", "1:" + System.currentTimeMillis());
        for (int i = 0; i < width * height; i++) {
            if (seedparam[i]!= 0 && seedparam[i] > (int)((fireLevel - boost) * Math.random())) {
                pallet[i] = 127;
            } else if (seedparam[i] != 0) {
                pallet[i] = 0;
            }
        }
        if (boost > 0) {
            boost--;
        }
 
        Log.d("TIME", "2:" + System.currentTimeMillis());
        for (int i = 1; i < height - 1; i++) {
            for (int j = 1; j < width - 1; j++) {
                pallet[(i - 1) * width + j] = (pallet[i * width + j] + 
                        pallet[i * width + j - 1] + 
                        pallet[i * width + j + 1] + 
                        pallet[(i - 1) * width + j] + 
                        pallet[(i + 1) * width + j]) / 5;
            }
        }
        Log.d("TIME", "3:" + System.currentTimeMillis());
 
        for (int i = 0; i < width * height; i++) {
            image[i] = color[pallet[i]];
        }
 
        Log.d("TIME", "4:" + System.currentTimeMillis());
        bitmap.setPixels(image, 0, width, 0, 0, width, height);
        Log.d("TIME", "5:" + System.currentTimeMillis());
        canvas.drawBitmap(bitmap, 0, 0, null);
        Log.d("TIME", "6:" + System.currentTimeMillis());
    }
}

public void draw(Canvas canvas) {
    synchronized (this) {
        effect(fireLevel, width, height, image, pallet, seedparam, color);
        bitmap.setPixels(image, 0, width, 0, 0, width, height);
        canvas.drawBitmap(bitmap, 0, 0, null);
    }
}

private native void effect(int fireLevel, int width, int height, int[] image, int[] pallet, int[] seedparam, int[] color);