102 lines
3.4 KiB
C++
102 lines
3.4 KiB
C++
/*
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* Copyright (C) 2019 The Android Open Source Project
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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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*/
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#include <input/DisplayViewport.h>
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#include <input/TouchVideoFrame.h>
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namespace android {
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TouchVideoFrame::TouchVideoFrame(uint32_t height, uint32_t width, std::vector<int16_t> data,
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const struct timeval& timestamp) :
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mHeight(height), mWidth(width),mData(std::move(data)), mTimestamp(timestamp) {
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}
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bool TouchVideoFrame::operator==(const TouchVideoFrame& rhs) const {
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return mHeight == rhs.mHeight
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&& mWidth == rhs.mWidth
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&& mData == rhs.mData
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&& mTimestamp.tv_sec == rhs.mTimestamp.tv_sec
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&& mTimestamp.tv_usec == rhs.mTimestamp.tv_usec;
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}
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uint32_t TouchVideoFrame::getHeight() const { return mHeight; }
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uint32_t TouchVideoFrame::getWidth() const { return mWidth; }
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const std::vector<int16_t>& TouchVideoFrame::getData() const { return mData; }
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const struct timeval& TouchVideoFrame::getTimestamp() const { return mTimestamp; }
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void TouchVideoFrame::rotate(int32_t orientation) {
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switch (orientation) {
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case DISPLAY_ORIENTATION_90:
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rotateQuarterTurn(false /*clockwise*/);
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break;
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case DISPLAY_ORIENTATION_180:
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rotate180();
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break;
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case DISPLAY_ORIENTATION_270:
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rotateQuarterTurn(true /*clockwise*/);
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break;
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}
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}
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/**
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* Rotate once clockwise by a quarter turn === rotate 90 degrees
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* Rotate once counterclockwise by a quarter turn === rotate 270 degrees
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* For a clockwise rotation:
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* An element at position (i, j) is rotated to (j, height - i - 1)
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* For a counterclockwise rotation:
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* An element at position (i, j) is rotated to (width - j - 1, i)
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*/
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void TouchVideoFrame::rotateQuarterTurn(bool clockwise) {
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std::vector<int16_t> rotated(mData.size());
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for (size_t i = 0; i < mHeight; i++) {
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for (size_t j = 0; j < mWidth; j++) {
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size_t iRotated, jRotated;
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if (clockwise) {
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iRotated = j;
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jRotated = mHeight - i - 1;
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} else {
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iRotated = mWidth - j - 1;
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jRotated = i;
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}
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size_t indexRotated = iRotated * mHeight + jRotated;
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rotated[indexRotated] = mData[i * mWidth + j];
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}
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}
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mData = std::move(rotated);
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std::swap(mHeight, mWidth);
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}
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/**
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* An element at position (i, j) is rotated to (height - i - 1, width - j - 1)
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* This is equivalent to moving element [i] to position [height * width - i - 1]
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* Since element at [height * width - i - 1] would move to position [i],
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* we can just swap elements [i] and [height * width - i - 1].
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*/
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void TouchVideoFrame::rotate180() {
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if (mData.size() == 0) {
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return;
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}
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// Just need to swap elements i and (height * width - 1 - i)
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for (size_t i = 0; i < mData.size() / 2; i++) {
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std::swap(mData[i], mData[mHeight * mWidth - 1 - i]);
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}
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}
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} // namespace android
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