103 lines
3.2 KiB
C++
103 lines
3.2 KiB
C++
// Copyright 2019 The MediaPipe Authors.
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//
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// Licensed under the Apache License, Version 2.0 (the "License");
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// you may not use this file except in compliance with the License.
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// You may obtain a copy of the License at
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//
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// http://www.apache.org/licenses/LICENSE-2.0
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//
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// Unless required by applicable law or agreed to in writing, software
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// distributed under the License is distributed on an "AS IS" BASIS,
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// WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
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// See the License for the specific language governing permissions and
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// limitations under the License.
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#include "mediapipe/framework/formats/image_opencv.h"
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#include "mediapipe/framework/formats/image_format.pb.h"
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#include "mediapipe/framework/port/logging.h"
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namespace {
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// Maps Image format to OpenCV Mat type.
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// See mediapipe...image_format.proto and cv...opencv2/core/hal/interface.h
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// for more details on respective formats.
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int GetMatType(const mediapipe::ImageFormat::Format format) {
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int type = 0;
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switch (format) {
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case mediapipe::ImageFormat::UNKNOWN:
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// Invalid; Default to uchar.
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type = CV_8U;
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break;
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case mediapipe::ImageFormat::SRGB:
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type = CV_8U;
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break;
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case mediapipe::ImageFormat::SRGBA:
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type = CV_8U;
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break;
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case mediapipe::ImageFormat::GRAY8:
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type = CV_8U;
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break;
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case mediapipe::ImageFormat::GRAY16:
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type = CV_16U;
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break;
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case mediapipe::ImageFormat::YCBCR420P:
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// Invalid; Default to uchar.
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type = CV_8U;
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break;
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case mediapipe::ImageFormat::YCBCR420P10:
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// Invalid; Default to uint16.
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type = CV_16U;
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break;
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case mediapipe::ImageFormat::SRGB48:
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type = CV_16U;
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break;
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case mediapipe::ImageFormat::SRGBA64:
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type = CV_16U;
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break;
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case mediapipe::ImageFormat::VEC32F1:
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type = CV_32F;
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break;
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case mediapipe::ImageFormat::VEC32F2:
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type = CV_32FC2;
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break;
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case mediapipe::ImageFormat::LAB8:
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type = CV_8U;
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break;
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case mediapipe::ImageFormat::SBGRA:
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type = CV_8U;
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break;
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default:
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// Invalid or unknown; Default to uchar.
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type = CV_8U;
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break;
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}
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return type;
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}
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} // namespace
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namespace mediapipe {
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namespace formats {
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cv::Mat MatView(const mediapipe::Image* image) {
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const int dims = 2;
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const int sizes[] = {image->height(), image->width()};
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const int type =
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CV_MAKETYPE(GetMatType(image->image_format()), image->channels());
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const size_t steps[] = {static_cast<size_t>(image->step()),
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static_cast<size_t>(ImageFrame::ByteDepthForFormat(
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image->image_format()))};
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mediapipe::PixelWriteLock dst_lock(const_cast<mediapipe::Image*>(image));
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uint8* data_ptr = dst_lock.Pixels();
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CHECK(data_ptr != nullptr);
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// Use Image to initialize in-place. Image still owns memory.
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if (steps[0] == sizes[1] * image->channels() *
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ImageFrame::ByteDepthForFormat(image->image_format())) {
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// Contiguous memory optimization. See b/78570764
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return cv::Mat(dims, sizes, type, data_ptr);
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} else {
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// Custom width step.
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return cv::Mat(dims, sizes, type, data_ptr, steps);
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}
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}
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} // namespace formats
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} // namespace mediapipe
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