RotaterUtil.java
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package com.megvii.idcardlib.util;
public class RotaterUtil {
public static byte[] rotate(byte[] data, int imageWidth, int imageHeight,
int rotate) {
switch (rotate) {
case 0:
return data;
case 90:
return rotateYUV420Degree90(data, imageWidth, imageHeight);
case 180:
return rotateYUV420Degree180(data, imageWidth, imageHeight);
case 270:
return rotateYUV420Degree270(data, imageWidth, imageHeight);
}
return data;
}
public static byte[] rotateYUV420Degree90(byte[] data, int imageWidth,
int imageHeight) {
byte[] yuv = new byte[imageWidth * imageHeight * 3 / 2];
// Rotate the Y luma
int i = 0;
for (int x = 0; x < imageWidth; x++) {
for (int y = imageHeight - 1; y >= 0; y--) {
yuv[i] = data[y * imageWidth + x];
i++;
}
}
// int offset = imageWidth * imageHeight;
// for (int x = 0; x < imageWidth / 2; x ++)
// for (int y = imageHeight / 2 - 1; y >= 0; y --) {
// yuv[i] = data[offset + (y * imageWidth) + x];
// i ++ ;
// yuv[i] = data[offset + (y * imageWidth) + x + 1];
// i ++;
// }
// Rotate the U and V color components
i = imageWidth * imageHeight * 3 / 2 - 1;
for (int x = imageWidth - 1; x > 0; x = x - 2) {
for (int y = 0; y < imageHeight / 2; y++) {
yuv[i] = data[(imageWidth * imageHeight) + (y * imageWidth) + x];
i--;
yuv[i] = data[(imageWidth * imageHeight) + (y * imageWidth)
+ (x - 1)];
i--;
}
}
return yuv;
}
public static byte[] rotateYUV420Degree180(byte[] data, int imageWidth,
int imageHeight) {
byte[] yuv = new byte[imageWidth * imageHeight * 3 / 2];
int i = 0;
int count = 0;
for (i = imageWidth * imageHeight - 1; i >= 0; i--) {
yuv[count] = data[i];
count++;
}
i = imageWidth * imageHeight * 3 / 2 - 1;
for (i = imageWidth * imageHeight * 3 / 2 - 1; i >= imageWidth
* imageHeight; i -= 2) {
yuv[count++] = data[i - 1];
yuv[count++] = data[i];
}
return yuv;
}
public static byte[] rotateYUV420Degree270(byte[] data, int imageWidth,
int imageHeight) {
byte[] yuv = new byte[imageWidth * imageHeight * 3 / 2];
// Rotate the Y luma
int index = 0;
int i = 0;
for (int x = imageWidth - 1; x >= 0; x--) {
index = 0;
for (int y = 0; y < imageHeight; y++) {
yuv[i] = data[index + x];
i++;
index += imageWidth;
}
}
// Rotate the U and V color components
i = imageWidth * imageHeight;
int count = imageWidth * imageHeight;
for (int x = imageWidth - 1; x > 0; x = x - 2) {
index = count;
for (int y = 0; y < imageHeight / 2; y++) {
yuv[i] = data[index + (x - 1)];
i++;
yuv[i] = data[index + x];
i++;
index += imageWidth;
}
}
return yuv;
}
}