我需要通过JNI将类似drawable的图像数据从Java端传递到cocos2d-x。我该如何实施?JNI函数的参数应该是什么?如何在cocos2d-x端进行强制转换?
为JNI创建Java接口,例如:
public static native void setBG(int[] raw, int width, int height);
在C ++代码中执行以下操作:
//Use static variable here for simplicity
int *imagedata;
int staticwidth;
int staticheight;
Texture2D *userBackgroundImage;
void Java_com_my_company_JniHelper_setBG(JNIEnv* env, jobject thiz, jintArray raw, jint width, jint height)
{
jint *carr;
carr = env->GetIntArrayElements(raw, 0);
if(carr == NULL) {
return; /* exception occurred */
}
ssize_t dataLen = (int)width * (int)height;
int *data = new int[dataLen];
for (long i = 0; i < dataLen; i++)
{
data[i] = carr[i];
}
imagedata = data;//Make a copy because it need to be done in GLThread
staticwidth = (int)width;
staticheight = (int)height;
env->ReleaseIntArrayElements(raw, carr, 0);
LOGD("set image: %d * %d", width, height);
}
然后在持续时间层init或其他cocos2d-x代码的某个地方调用以下方法:
void createImage(const void *data, ssize_t dataLen, int width, int height)
{
Texture2D *image = new Texture2D();
if (!image->initWithData(data, dataLen, Texture2D::PixelFormat::BGRA8888, width, height, Size(width, height)))
{
delete image;
delete imagedata;
image = NULL;
imagedata = NULL;
userBackgroundImage = NULL;
return;
}
delete imagedata;
imagedata = NULL;
userBackgroundImage = image;
}
然后,您可以使用Texture2D对象创建一个精灵或做任何您想做的事
要从Java调用此代码:
public static int[] BitmapToRaw(Bitmap bitmap) {
Bitmap image = bitmap.copy(Bitmap.Config.ARGB_8888, false);
int width = image.getWidth();
int height = image.getHeight();
int[] raw = new int[width * height];
image.getPixels(raw, 0, width, 0, 0, width, height);
return raw;
}
Bitmap image = BitmapFactory.decodeResource(getResources(), R.drawable.bg);
JniHelper.setBG(BitmapToRaw(image), image.getWidth(), image.getHeight());
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