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qrcodelib/src/main/java/com/yunzhou/qrcodelib/zxing/utils/BitmapFlex.java
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| package com.yunzhou.qrcodelib.zxing.utils; | ||
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| import android.graphics.Bitmap; | ||
| import android.util.Log; | ||
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| /** | ||
| * Created with Android Studio. | ||
| * Description:主要用于等间采样缩放。等间采样缩放在单一色彩的图中表现较好，不会产生模糊，可用于放大 DATA_MATRIX 二维码。 | ||
| * User: huayunzhou | ||
| * Date: 2018-08-20 | ||
| * Time: 10:19 | ||
| */ | ||
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| public class BitmapFlex { | ||
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| /** | ||
| * 等间隔采样的图像缩放 | ||
| * @param bitmap 要缩放的图像对象 | ||
| * @param dstWidth 缩放后图像的宽 | ||
| * @param dstHeight 缩放后图像的高 | ||
| * @return 返回处理后的图像对象 | ||
| */ | ||
| public static Bitmap flex(Bitmap bitmap, int dstWidth, int dstHeight) { | ||
| float wScale = (float) dstWidth / bitmap.getWidth(); | ||
| float hScale = (float) dstHeight / bitmap.getHeight(); | ||
| return flex(bitmap, wScale, hScale); | ||
| } | ||
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| /** | ||
| * 等间隔采样的图像缩放 | ||
| * @param bitmap 要缩放的bitap对象 | ||
| * @param wScale 要缩放的横列（宽）比列 | ||
| * @param hScale 要缩放的纵行（高）比列 | ||
| * @return 返回处理后的图像对象 | ||
| */ | ||
| public static Bitmap flex(Bitmap bitmap, float wScale, float hScale) { | ||
| if (wScale <= 0 || hScale <= 0){ | ||
| return null; | ||
| } | ||
| float ii = 1 / wScale; //采样的行间距 | ||
| float jj = 1 / hScale; //采样的列间距 | ||
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| int width = bitmap.getWidth(); | ||
| int height = bitmap.getHeight(); | ||
| int dstWidth = (int) (wScale * width); | ||
| int dstHeight = (int) (hScale * height); | ||
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| int[] pixels = new int[width * height]; | ||
| bitmap.getPixels(pixels, 0, width, 0, 0, width, height); | ||
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| int[] dstPixels = new int[dstWidth * dstHeight]; | ||
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| for (int j = 0; j < dstHeight; j++) { | ||
| for (int i = 0; i < dstWidth; i++) { | ||
| dstPixels[j * dstWidth + i] = pixels[(int) (jj * j) * width + (int) (ii * i)]; | ||
| } | ||
| } | ||
| System.out.println((int) ((dstWidth - 1) * ii)); | ||
| Log.d(">>>",""+"dstPixels:"+dstWidth+" x "+dstHeight); | ||
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| Bitmap outBitmap = Bitmap.createBitmap(dstWidth, dstHeight, Bitmap.Config.RGB_565); | ||
| outBitmap.setPixels(dstPixels, 0, dstWidth, 0, 0, dstWidth, dstHeight); | ||
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| return outBitmap; | ||
| } | ||
| } |