Extracted common test helper functions out from the unittest into a sharable

library. Also migrated away from OpenCVX.

PiperOrigin-RevId: 490074410

mediapipe/util/image_test_utils.h

@@ -0,0 +1,32 @@
+#ifndef MEDIAPIPE_UTIL_IMAGE_TEST_UTILS_H_
+#define MEDIAPIPE_UTIL_IMAGE_TEST_UTILS_H_
+
+#include <string>
+
+#include "mediapipe/framework/formats/image.h"
+#include "mediapipe/framework/packet.h"
+#include "mediapipe/framework/port/opencv_core_inc.h"
+
+namespace mediapipe {
+
+// Reads the image file into cv::Mat with RGB channels.
+cv::Mat GetRgb(const std::string& path);
+
+// Reads the image file into cv::Mat with RGBA channels.
+cv::Mat GetRgba(const std::string& path);
+
+// Reads the image file into cv::Mat with Gray channel.
+cv::Mat GetGray(const std::string& path);
+
+// Converts the image channels into corresponding ImageFormat.
+mediapipe::ImageFormat::Format GetImageFormat(int image_channels);
+
+// Converts the cv::Mat into ImageFrame packet.
+Packet MakeImageFramePacket(cv::Mat input, int timestamp = 0);
+
+// Converts the cv::Mat into Image packet.
+Packet MakeImagePacket(cv::Mat input, int timestamp = 0);
+
+}  // namespace mediapipe
+
+#endif  // MEDIAPIPE_UTIL_IMAGE_TEST_UTILS_H_