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      1 /*
      2  * Copyright (C) 2018 The Android Open Source Project
      3  *
      4  * Licensed under the Apache License, Version 2.0 (the "License");
      5  * you may not use this file except in compliance with the License.
      6  * You may obtain a copy of the License at
      7  *
      8  *      http://www.apache.org/licenses/LICENSE-2.0
      9  *
     10  * Unless required by applicable law or agreed to in writing, software
     11  * distributed under the License is distributed on an "AS IS" BASIS,
     12  * WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
     13  * See the License for the specific language governing permissions and
     14  * limitations under the License.
     15  */
     16 
     17 #ifndef _LIBINPUT_TOUCHVIDEOFRAME_H
     18 #define _LIBINPUT_TOUCHVIDEOFRAME_H
     19 
     20 #include <stdint.h>
     21 #include <sys/time.h>
     22 #include <ui/DisplayInfo.h>
     23 #include <vector>
     24 
     25 namespace android {
     26 
     27 /**
     28  * Represents data from a single scan of the touchscreen device.
     29  * Similar in concept to a video frame, but the touch strength is used as
     30  * the values instead.
     31  */
     32 class TouchVideoFrame {
     33 public:
     34     TouchVideoFrame(uint32_t height, uint32_t width, std::vector<int16_t> data,
     35             const struct timeval& timestamp);
     36 
     37     bool operator==(const TouchVideoFrame& rhs) const;
     38 
     39     /**
     40      * Height of the frame
     41      */
     42     uint32_t getHeight() const;
     43     /**
     44      * Width of the frame
     45      */
     46     uint32_t getWidth() const;
     47     /**
     48      * The touch strength data.
     49      * The array is a 2-D row-major matrix, with dimensions (height, width).
     50      * Total size of the array should equal getHeight() * getWidth().
     51      * Data is allowed to be negative.
     52      */
     53     const std::vector<int16_t>& getData() const;
     54     /**
     55      * Time at which the heatmap was taken.
     56      */
     57     const struct timeval& getTimestamp() const;
     58 
     59     /**
     60      * Rotate the video frame.
     61      * The rotation value is an enum from ui/DisplayInfo.h
     62      */
     63     void rotate(int32_t orientation);
     64 
     65 private:
     66     uint32_t mHeight;
     67     uint32_t mWidth;
     68     std::vector<int16_t> mData;
     69     struct timeval mTimestamp;
     70 
     71     /**
     72      * Common method for 90 degree and 270 degree rotation
     73      */
     74     void rotateQuarterTurn(bool clockwise);
     75     void rotate180();
     76 };
     77 
     78 } // namespace android
     79 
     80 #endif // _LIBINPUT_TOUCHVIDEOFRAME_H
     81