我使用以下代码从位图获取像素数据，然后通过JNI将数组传递给cocos2dx。当我在cocos2d-x中渲染图像时，红色和蓝色通道是反向的。是否有一种方法可以从像素的int值单独访问红色，蓝色通道，然后交换它们?
<JAVA代码/strong>
int[] pixels = new int[bitmap.getWidth() * bitmap.getHeight()];
bitmap.getPixels(pixels, 0, bitmap.getWidth(), 0, 0, bitmap.getWidth(), bitmap.getHeight());
int len = bitmap.getWidth() * bitmap.getHeight();
onFacebookImageNative(pixels, len, bitmap.getWidth(), bitmap.getHeight(), bitsPerComponent);
JNI代码
JNIEXPORT void JNICALL Java_com_xxxx_yyyyo_yyyyo_onFacebookImageNative(JNIEnv* env, jobject,
jintArray pixels, jint dataLen, jint width, jint height, jint bitsPerComponent)
{
yyyyo *yyyyo = yyyyo::singleton();
jint *jArr = env->GetIntArrayElements(pixels, NULL);
int pixelsInt[dataLen];
for (int i=0; i<dataLen; i++){
pixelsInt[i] = (int)jArr[i];
}
yyyyo->onFacebookImage(pixelsInt, (int) dataLen,
CCImage::kFmtRawData, (int) width, (int) height, (int) bitsPerComponent);
}
好吧，可能我问得太早了，还没来得及问。
<JAVA代码/strong>
int[] pixels = new int[bitmap.getWidth() * bitmap.getHeight()];
bitmap.getPixels(pixels, 0, bitmap.getWidth(), 0, 0, bitmap.getWidth(), bitmap.getHeight());
int[] finalArray = new int[bitmap.getWidth() * bitmap.getHeight()];
for(int i = 0; i < len; i++) {
int red = Color.red(pixels[i]);
int green = Color.green(pixels[i]);
int blue = Color.blue(pixels[i]);
finalArray[i] = Color.rgb(blue, green, red);//invert sequence here.
}
int len = bitmap.getWidth() * bitmap.getHeight();
onFacebookImageNative(pixels, len, bitmap.getWidth(), bitmap.getHeight(), bitsPerComponent);
如果有人有更好的答案，不需要遍历每个像素，那么请在这里分享。