60 lines
2.2 KiB
C++
60 lines
2.2 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/calculator_framework.h"
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#include "mediapipe/framework/formats/image_frame_opencv.h"
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#include "mediapipe/framework/port/opencv_imgproc_inc.h"
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#include "mediapipe/framework/port/status.h"
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#include "mediapipe/framework/port/status_builder.h"
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namespace mediapipe {
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// Takes in a string, draws the text string by cv::putText(), and outputs an
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// ImageFrame.
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//
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// Example config:
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// node {
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// calculator: "OpenCvPutTextCalculator"
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// input_stream: "text_to_put"
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// output_stream: "out_image_frames"
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// }
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// TODO: Generalize the calculator for other text use cases.
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class OpenCvPutTextCalculator : public CalculatorBase {
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public:
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static absl::Status GetContract(CalculatorContract* cc);
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absl::Status Process(CalculatorContext* cc) override;
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};
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absl::Status OpenCvPutTextCalculator::GetContract(CalculatorContract* cc) {
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cc->Inputs().Index(0).Set<std::string>();
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cc->Outputs().Index(0).Set<ImageFrame>();
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return absl::OkStatus();
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}
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absl::Status OpenCvPutTextCalculator::Process(CalculatorContext* cc) {
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const std::string& text_content = cc->Inputs().Index(0).Get<std::string>();
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cv::Mat mat = cv::Mat::zeros(640, 640, CV_8UC4);
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cv::putText(mat, text_content, cv::Point(15, 70), cv::FONT_HERSHEY_PLAIN, 3,
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cv::Scalar(255, 255, 0, 255), 4);
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std::unique_ptr<ImageFrame> output_frame = absl::make_unique<ImageFrame>(
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ImageFormat::SRGBA, mat.size().width, mat.size().height);
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mat.copyTo(formats::MatView(output_frame.get()));
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cc->Outputs().Index(0).Add(output_frame.release(), cc->InputTimestamp());
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return absl::OkStatus();
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}
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REGISTER_CALCULATOR(OpenCvPutTextCalculator);
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} // namespace mediapipe
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