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PiperOrigin-RevId: 253489161
2019-06-16 16:06:57 -07:00
commit d68f5e4169
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+// Copyright 2019 The MediaPipe Authors.
+//
+// Licensed under the Apache License, Version 2.0 (the "License");
+// you may not use this file except in compliance with the License.
+// You may obtain a copy of the License at
+//
+//      http://www.apache.org/licenses/LICENSE-2.0
+//
+// Unless required by applicable law or agreed to in writing, software
+// distributed under the License is distributed on an "AS IS" BASIS,
+// WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
+// See the License for the specific language governing permissions and
+// limitations under the License.
+
+#include "mediapipe/framework/formats/image_frame_opencv.h"
+
+#include "mediapipe/framework/formats/image_format.pb.h"
+
+namespace {
+// Maps ImageFrame format to OpenCV Mat type.
+// See mediapipe...image_format.proto and cv...opencv2/core/hal/interface.h
+// for more details on respective formats.
+int GetMatType(const mediapipe::ImageFormat::Format format) {
+  int type = 0;
+  switch (format) {
+    case mediapipe::ImageFormat::UNKNOWN:
+      // Invalid; Default to uchar.
+      type = CV_8U;
+      break;
+    case mediapipe::ImageFormat::SRGB:
+      type = CV_8U;
+      break;
+    case mediapipe::ImageFormat::SRGBA:
+      type = CV_8U;
+      break;
+    case mediapipe::ImageFormat::GRAY8:
+      type = CV_8U;
+      break;
+    case mediapipe::ImageFormat::GRAY16:
+      type = CV_16U;
+      break;
+    case mediapipe::ImageFormat::YCBCR420P:
+      // Invalid; Default to uchar.
+      type = CV_8U;
+      break;
+    case mediapipe::ImageFormat::YCBCR420P10:
+      // Invalid; Default to uint16.
+      type = CV_16U;
+      break;
+    case mediapipe::ImageFormat::SRGB48:
+      type = CV_16U;
+      break;
+    case mediapipe::ImageFormat::SRGBA64:
+      type = CV_16U;
+      break;
+    case mediapipe::ImageFormat::VEC32F1:
+      type = CV_32F;
+      break;
+    case mediapipe::ImageFormat::LAB8:
+      type = CV_8U;
+      break;
+    default:
+      // Invalid or unknown; Default to uchar.
+      type = CV_8U;
+      break;
+  }
+  return type;
+}
+}  // namespace
+
+namespace mediapipe {
+
+namespace formats {
+
+cv::Mat MatView(const ImageFrame* image) {
+  const int dims = 2;
+  const int sizes[] = {image->Height(), image->Width()};
+  const int type =
+      CV_MAKETYPE(GetMatType(image->Format()), image->NumberOfChannels());
+  const size_t steps[] = {static_cast<size_t>(image->WidthStep()),
+                          static_cast<size_t>(image->ByteDepth())};
+  // Use ImageFrame to initialize in-place. ImageFrame still owns memory.
+  if (steps[0] == sizes[1] * image->NumberOfChannels() * image->ByteDepth()) {
+    // Contiguous memory optimization. See b/78570764
+    return cv::Mat(dims, sizes, type, const_cast<uint8*>(image->PixelData()));
+  } else {
+    // Custom width step.
+    return cv::Mat(dims, sizes, type, const_cast<uint8*>(image->PixelData()),
+                   steps);
+  }
+}
+
+}  // namespace formats
+}  // namespace mediapipe