我在库中的类方法中找到了以下代码:transform
PerspectiveTransform
JAI
public void transform(double[] srcPts, int srcOff,
double[] dstPts, int dstOff,
int numPts) {
if ( srcPts == null ) {
throw new IllegalArgumentException(JaiI18N.getString("Generic0"));
}
if (dstPts == null) {
dstPts = new double[numPts * 2 + dstOff];
}
while (numPts-- > 0) {
double x = srcPts[srcOff++];
double y = srcPts[srcOff++];
double w = m20 * x + m21 * y + m22;
if (w == 0) {
dstPts[dstOff++] = x;
dstPts[dstOff++] = y;
} else {
dstPts[dstOff++] = (m00 * x + m01 * y + m02) / w;
dstPts[dstOff++] = (m10 * x + m11 * y + m12) / w;
}
}
}
看起来 if dstPts
is null
,然后创建新数组。但是这个数组不会返回外面,不是吗?