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      1 /*
      2  * Copyright (C) 2019 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 #include <input/TouchVideoFrame.h>
     18 
     19 namespace android {
     20 
     21 TouchVideoFrame::TouchVideoFrame(uint32_t height, uint32_t width, std::vector<int16_t> data,
     22         const struct timeval& timestamp) :
     23          mHeight(height), mWidth(width),mData(std::move(data)), mTimestamp(timestamp) {
     24 }
     25 
     26 bool TouchVideoFrame::operator==(const TouchVideoFrame& rhs) const {
     27     return mHeight == rhs.mHeight
     28             && mWidth == rhs.mWidth
     29             && mData == rhs.mData
     30             && mTimestamp.tv_sec == rhs.mTimestamp.tv_sec
     31             && mTimestamp.tv_usec == rhs.mTimestamp.tv_usec;
     32 }
     33 
     34 uint32_t TouchVideoFrame::getHeight() const { return mHeight; }
     35 
     36 uint32_t TouchVideoFrame::getWidth() const { return mWidth; }
     37 
     38 const std::vector<int16_t>& TouchVideoFrame::getData() const { return mData; }
     39 
     40 const struct timeval& TouchVideoFrame::getTimestamp() const { return mTimestamp; }
     41 
     42 void TouchVideoFrame::rotate(int32_t orientation) {
     43     switch (orientation) {
     44         case DISPLAY_ORIENTATION_90:
     45             rotateQuarterTurn(true /*clockwise*/);
     46             break;
     47         case DISPLAY_ORIENTATION_180:
     48             rotate180();
     49             break;
     50         case DISPLAY_ORIENTATION_270:
     51             rotateQuarterTurn(false /*clockwise*/);
     52             break;
     53     }
     54 }
     55 
     56 /**
     57  * Rotate once clockwise by a quarter turn === rotate 90 degrees
     58  * Rotate once counterclockwise by a quarter turn === rotate 270 degrees
     59  * For a clockwise rotation:
     60  *     An element at position (i, j) is rotated to (j, height - i - 1)
     61  * For a counterclockwise rotation:
     62  *     An element at position (i, j) is rotated to (width - j - 1, i)
     63  */
     64 void TouchVideoFrame::rotateQuarterTurn(bool clockwise) {
     65     std::vector<int16_t> rotated(mData.size());
     66     for (size_t i = 0; i < mHeight; i++) {
     67         for (size_t j = 0; j < mWidth; j++) {
     68             size_t iRotated, jRotated;
     69             if (clockwise) {
     70                 iRotated = j;
     71                 jRotated = mHeight - i - 1;
     72             } else {
     73                 iRotated = mWidth - j - 1;
     74                 jRotated = i;
     75             }
     76             size_t indexRotated = iRotated * mHeight + jRotated;
     77             rotated[indexRotated] = mData[i * mWidth + j];
     78         }
     79     }
     80     mData = std::move(rotated);
     81     std::swap(mHeight, mWidth);
     82 }
     83 
     84 /**
     85  * An element at position (i, j) is rotated to (height - i - 1, width - j - 1)
     86  * This is equivalent to moving element [i] to position [height * width - i - 1]
     87  * Since element at [height * width - i - 1] would move to position [i],
     88  * we can just swap elements [i] and [height * width - i - 1].
     89  */
     90 void TouchVideoFrame::rotate180() {
     91     if (mData.size() == 0) {
     92         return;
     93     }
     94     // Just need to swap elements i and (height * width - 1 - i)
     95     for (size_t i = 0; i < mData.size() / 2; i++) {
     96         std::swap(mData[i], mData[mHeight * mWidth - 1 - i]);
     97     }
     98 }
     99 
    100 } // namespace android
    101