【Android】native里Bitmap转Mat

void ConvertBitmapToRGBAMat(JNIEnv* env, jobject& bitmap, Mat& dst,
                            bool needUnPremultiplyAlpha) {
    AndroidBitmapInfo info;
    void* pixels = 0;

    try {
        CV_Assert(AndroidBitmap_getInfo(env, bitmap, &info) >= 0);
        CV_Assert(info.format == ANDROID_BITMAP_FORMAT_RGBA_8888 ||
                  info.format == ANDROID_BITMAP_FORMAT_RGB_565);
        CV_Assert(AndroidBitmap_lockPixels(env, bitmap, &pixels) >= 0);
        CV_Assert(pixels);
        dst.create(info.height, info.width, CV_8UC4);
        if (info.format == ANDROID_BITMAP_FORMAT_RGBA_8888) {
            //LOG(INFO) << "nBitmapToMat: RGBA_8888 -> CV_8UC4";
            Mat tmp(info.height, info.width, CV_8UC4, pixels);
            if (needUnPremultiplyAlpha)
                cvtColor(tmp, dst, COLOR_mRGBA2RGBA);
            else
                tmp.copyTo(dst);
        } else {
            // info.format == ANDROID_BITMAP_FORMAT_RGB_565
            //LOG(INFO) << "nBitmapToMat: RGB_565 -> CV_8UC4";
            Mat tmp(info.height, info.width, CV_8UC2, pixels);
            cvtColor(tmp, dst, COLOR_BGR5652RGBA);
        }
        AndroidBitmap_unlockPixels(env, bitmap);
        return;
    } catch (const cv::Exception& e) {
        AndroidBitmap_unlockPixels(env, bitmap);
        //LOG(FATAL) << "nBitmapToMat catched cv::Exception:" << e.what();
        jclass je = env->FindClass("org/opencv/core/CvException");
        if (!je)
            je = env->FindClass("java/lang/Exception");
        env->ThrowNew(je, e.what());
        return;
    } catch (...) {
        AndroidBitmap_unlockPixels(env, bitmap);
        //LOG(FATAL) << "nBitmapToMat catched unknown exception (...)";
        jclass je = env->FindClass("java/lang/Exception");
        env->ThrowNew(je, "Unknown exception in JNI code {nBitmapToMat}");
        return;
    }
}

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