如何将位图分成也是位图的部分 [英] How to divide a bitmap into parts that are bitmaps too

问题描述

我需要一些关于将位图分割成小块的可能方法的信息.

I need some info on the possible methods for dividing a bitmap in smaller pieces.

更重要的是，我需要一些选项来判断.我查了很多帖子，但我仍然不完全相信该怎么做:

More importantly I would need some options to judge. I have checked many posts and I am still not entirely convinced about what to do:

1. 剪切位图部分
2. 如何剪掉中间部分位图的区域?

这两个帖子是我找到的一些不错的选择，但我无法计算每种方法的 CPU 和 RAM 成本，或者我可能根本不应该为此计算而烦恼.尽管如此，如果我要做某事，为什么不从一开始就以最好的方式去做呢.

These two posts are some good options I found, but I cant calculate the CPU and RAM cost of each method, or maybe I should not bother with this calculation at all. Nonetheless if I am about to do something, why not do it the best way from the start.

如果能得到一些关于位图压缩的提示和链接，我将不胜感激，这样我可能会结合这两种方法获得更好的性能.

I would be grateful to get some tips and links on bitmap compression so maybe I get better performance combining the two methods.

推荐答案

您想将位图分成几部分.我假设您想从位图中剪切相等的部分.例如，假设您需要位图的四个相等部分.

You want to divide a bitmap into parts. I assume you want to cut equal parts from bitmap. Say for example you need four equal parts from a bitmap.

这是一种将位图划分为四个相等部分并将其放入位图数组的方法.

This is a method which divides a bitmap onto four equal parts and has it in an array of bitmaps.

public Bitmap[] splitBitmap(Bitmap src) {
    Bitmap[] divided = new Bitmap[4];
    imgs[0] = Bitmap.createBitmap(
        src,
        0, 0,
        src.getWidth() / 2, src.getHeight() / 2
    );
    imgs[1] = Bitmap.createBitmap(
        src,
        src.getWidth() / 2, 0,
        src.getWidth() / 2, src.getHeight() / 2
    );
    imgs[2] = Bitmap.createBitmap(
        src,
        0, src.getHeight() / 2,
        src.getWidth() / 2, src.getHeight() / 2
    );
    imgs[3] = Bitmap.createBitmap(
        src,
        src.getWidth() / 2, src.getHeight() / 2,
        src.getWidth() / 2, src.getHeight() / 2
    );
    return divided;
}

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