Function screen

jni/platform/com_cloudream_ishow_algorithm_FaceDetector.cpp:548–581

}

void screen(cv::Mat& dst, const cv::Mat& src, const cv::Mat& mask, const cv::Point2i& position, float amount/* = 1.0f */)
{
	assert(src.channels() == 4 && dst.channels() == 4 && src.depth() == dst.depth());
	assert(mask.type() == CV_8UC1);

	Rect2i rect1(position.x, position.y, src.cols, src.rows);
	Rect2i rect2(0, 0, dst.cols, dst.rows);
	rect1 &= rect2;

	Rect2i rect_mask(0, 0, mask.cols, mask.rows);
	int offset_x = (src.cols - mask.cols)/2;
	int offset_y = (src.rows - mask.rows)/2;

	for(int r = rect1.y; r < (rect1.y + rect1.height); ++r)
	for(int c = rect1.x; c < (rect1.x + rect1.width); ++c)
	{
		int src_r = r - position.y, src_c = c - position.x;
		Point2i mask_position(src_c - offset_x, src_r - offset_y);
		if(!rect_mask.contains(mask_position) || mask.at<uchar>(mask_position) != 0)
			continue;

		const cv::Vec4b& src_color = src.at<cv::Vec4b>(src_r, src_c);

		cv::Vec4b& dst_color = dst.at<cv::Vec4b>(r, c);
		const int src_alpha = cvRound(src_color[3] * amount), isc_alpha = 255 - src_alpha;

		for(int i = 0; i < 3; ++i)
		{
			int sc = (src_color[i] * src_alpha + 127)/255;
			int dc = (dst_color[i] * isc_alpha + 127)/255;
			dst_color[i] = sc + dc - (2*sc*dc + 127)/255;
		}
	}
}

void JNICALL Java_com_cloudream_ishow_algorithm_FaceDetector_nativeBlendIris(JNIEnv *env,
		jclass clazz, jobject _image, jobject _iris, jobjectArray _points, jfloat amount)