package com.basic.security.utils;
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public class RotateUtil {
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byte[] yuv3;
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byte[] yuv2;
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byte[] yuv1;
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public byte[] rotateYUV420Degree90(byte[] data, int imageWidth, int imageHeight) {
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if (yuv3 == null) {
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yuv3 = new byte[imageWidth * imageHeight * 3 / 2];
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}
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int i = 0;
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for (int x = 0; x < imageWidth; x++) {
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for (int y = imageHeight - 1; y >= 0; y--) {
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yuv3[i] = data[y * imageWidth + x];
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i++;
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}
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}
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i = imageWidth * imageHeight * 3 / 2 - 1;
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for (int x = imageWidth - 1; x > 0; x = x - 2) {
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for (int y = 0; y < imageHeight / 2; y++) {
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yuv3[i] = data[(imageWidth * imageHeight) + (y * imageWidth) + x];
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i--;
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yuv3[i] = data[(imageWidth * imageHeight) + (y * imageWidth) + (x - 1)];
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i--;
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}
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}
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return yuv3;
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}
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public byte[] rotateYUV420Degree180(byte[] data, int imageWidth, int imageHeight) {
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if (yuv2 == null) {
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yuv2 = new byte[imageWidth * imageHeight * 3 / 2];
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}
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int i = 0;
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int count = 0;
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for (i = imageWidth * imageHeight - 1; i >= 0; i--) {
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yuv2[count] = data[i];
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count++;
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}
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i = imageWidth * imageHeight * 3 / 2 - 1;
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for (i = imageWidth * imageHeight * 3 / 2 - 1; i >= imageWidth
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* imageHeight; i -= 2) {
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yuv2[count++] = data[i - 1];
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yuv2[count++] = data[i];
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}
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return yuv2;
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}
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public byte[] rotateYUV420Degree270(byte[] data, int imageWidth,
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int imageHeight) {
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if (yuv1 == null) {
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yuv1 = new byte[imageWidth * imageHeight * 3 / 2];
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}
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int nWidth = 0, nHeight = 0;
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int wh = 0;
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int uvHeight = 0;
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if (imageWidth != nWidth || imageHeight != nHeight) {
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nWidth = imageWidth;
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nHeight = imageHeight;
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wh = imageWidth * imageHeight;
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uvHeight = imageHeight >> 1;
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}
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int k = 0;
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for (int i = 0; i < imageWidth; i++) {
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int nPos = 0;
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for (int j = 0; j < imageHeight; j++) {
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yuv1[k] = data[nPos + i];
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k++;
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nPos += imageWidth;
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}
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}
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for (int i = 0; i < imageWidth; i += 2) {
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int nPos = wh;
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for (int j = 0; j < uvHeight; j++) {
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yuv1[k] = data[nPos + i];
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yuv1[k + 1] = data[nPos + i + 1];
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k += 2;
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nPos += imageWidth;
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}
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}
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return rotateYUV420Degree180(yuv1, imageWidth, imageHeight);
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}
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}
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