An example of using JNI to directly access surface data

For example, this can give Surface Fill in blue :

    ///* Pass in surface Examples of direct drawing , The incoming color covers the whole surface */
    JNIEXPORT void JNICALL
    Java_com_opengldecoder_jnibridge_JniBridge_drawToSurface(JNIEnv *env, jobject activity,
                                                             jobject surface, jint color) {
        ANativeWindow_Buffer nwBuffer;

        LOGI("ANativeWindow_fromSurface ");
        ANativeWindow *mANativeWindow = ANativeWindow_fromSurface(env, surface);

        if (mANativeWindow == NULL) {
            LOGE("ANativeWindow_fromSurface error");
            return;
        }

        LOGI("ANativeWindow_lock ");
        if (0 != ANativeWindow_lock(mANativeWindow, &nwBuffer, 0)) {
            LOGE("ANativeWindow_lock error");
            return;
        }

        LOGI("ANativeWindow_lock nwBuffer->format ");
        if (nwBuffer.format == WINDOW_FORMAT_RGB_565) {
            int y, x;
            LOGI("nwBuffer->format == WINDOW_FORMAT_RGB_565");
            memset(nwBuffer.bits, color << 8, sizeof(__uint16_t) * nwBuffer.height * nwBuffer.width);
        } else if (nwBuffer.format == WINDOW_FORMAT_RGBA_8888) {
            LOGI("nwBuffer->format == WINDOW_FORMAT_RGBA_8888 ");
            memset(nwBuffer.bits, color, sizeof(__uint32_t) * nwBuffer.height * nwBuffer.width);
        }
        LOGI("ANativeWindow_unlockAndPost ");
        if (0 != ANativeWindow_unlockAndPost(mANativeWindow)) {
            LOGE("ANativeWindow_unlockAndPost error");
            return;
        }

        ANativeWindow_release(mANativeWindow);
        LOGI("ANativeWindow_release ");
    }