Question

我使用以下代码从位图获取像素数据，然后将数组通过JNI传递给cocos2dx。当我在cocos2d-x中渲染图像时，红色和蓝色通道被反转。有没有办法分别从像素的int值访问红色，蓝色通道然后互换它们？

JAVA CODE

    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 CODE

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);
}

Answer 1

好的，可能是我过早地问过这个问题而不是太努力。

JAVA CODE

    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，不涉及遍历每个像素，那么请在此处分享。

在android中位图改变蓝色和红色通道

1 个答案: