本文介绍了将Java位图像素传递给jni的最快方法的处理方法,对大家解决问题具有一定的参考价值,需要的朋友们下面随着小编来一起学习吧!
问题描述
我试图找到将位图从Java传递到JNI的最佳/最快方法.接下来是我目前如何执行此操作.可以改善它,还是有其他更快的方法?
I'm trying to find the best/fastest way to pass a bitmap from java to JNI. Next is how I do this operation at the moment. Can this be improved, or is there any other faster way?
void JNIBitmap::setBuffer(JNIEnv* env, const jobject bitmap)
{
// Allocate native pixels buffer
AndroidBitmapInfo bitmapInfo;
AndroidBitmap_getInfo(env, bitmap, &bitmapInfo)
this->bufferWidth = bitmapInfo.width;
this->bufferHeight = bitmapInfo.height;
this->bufferSize = this->bufferWidth * this->bufferHeight * 4;
this->buffer = new uint8_t[this->bufferSize];
// Copy pixels to native buffer
void* bitmapPixels;
AndroidBitmap_lockPixels(env, bitmap, &bitmapPixels)
memcpy((void*)this->buffer, bitmapPixels, this->bufferSize);
AndroidBitmap_unlockPixels(env, bitmap);
}
推荐答案
最简单的方法是只调用AndroidBitmap_lockPixels.因此,在JNIBitmap的构造函数中,您可以这样做:
The easiest way is to just call AndroidBitmap_lockPixels.So in the constructor of JNIBitmap you would do this:
void* bitmapPixels;
AndroidBitmap_lockPixels(env, bitmap, &bitmapPixels)
然后在析构函数中执行以下操作:
Then in the destructor you would do this:
AndroidBitmap_unlockPixels( env, bitmap);
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