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/*
* Copyright (C) 2019 The Android Open Source Project
*
* Licensed under the Apache License, Version 2.0 (the "License");
* you may not use this file except in compliance with the License.
* You may obtain a copy of the License at
*
* http://www.apache.org/licenses/LICENSE-2.0
*
* Unless required by applicable law or agreed to in writing, software
* distributed under the License is distributed on an "AS IS" BASIS,
* WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
* See the License for the specific language governing permissions and
* limitations under the License.
*/
#include <input/TouchVideoFrame.h>
namespace android {
TouchVideoFrame::TouchVideoFrame(uint32_t height, uint32_t width, std::vector<int16_t> data,
const struct timeval& timestamp) :
mHeight(height), mWidth(width),mData(std::move(data)), mTimestamp(timestamp) {
}
bool TouchVideoFrame::operator==(const TouchVideoFrame& rhs) const {
return mHeight == rhs.mHeight
&& mWidth == rhs.mWidth
&& mData == rhs.mData
&& mTimestamp.tv_sec == rhs.mTimestamp.tv_sec
&& mTimestamp.tv_usec == rhs.mTimestamp.tv_usec;
}
uint32_t TouchVideoFrame::getHeight() const { return mHeight; }
uint32_t TouchVideoFrame::getWidth() const { return mWidth; }
const std::vector<int16_t>& TouchVideoFrame::getData() const { return mData; }
const struct timeval& TouchVideoFrame::getTimestamp() const { return mTimestamp; }
void TouchVideoFrame::rotate(int32_t orientation) {
switch (orientation) {
case DISPLAY_ORIENTATION_90:
rotateQuarterTurn(true /*clockwise*/);
break;
case DISPLAY_ORIENTATION_180:
rotate180();
break;
case DISPLAY_ORIENTATION_270:
rotateQuarterTurn(false /*clockwise*/);
break;
}
}
/**
* Rotate once clockwise by a quarter turn === rotate 90 degrees
* Rotate once counterclockwise by a quarter turn === rotate 270 degrees
* For a clockwise rotation:
* An element at position (i, j) is rotated to (j, height - i - 1)
* For a counterclockwise rotation:
* An element at position (i, j) is rotated to (width - j - 1, i)
*/
void TouchVideoFrame::rotateQuarterTurn(bool clockwise) {
std::vector<int16_t> rotated(mData.size());
for (size_t i = 0; i < mHeight; i++) {
for (size_t j = 0; j < mWidth; j++) {
size_t iRotated, jRotated;
if (clockwise) {
iRotated = j;
jRotated = mHeight - i - 1;
} else {
iRotated = mWidth - j - 1;
jRotated = i;
}
size_t indexRotated = iRotated * mHeight + jRotated;
rotated[indexRotated] = mData[i * mWidth + j];
}
}
mData = std::move(rotated);
std::swap(mHeight, mWidth);
}
/**
* An element at position (i, j) is rotated to (height - i - 1, width - j - 1)
* This is equivalent to moving element [i] to position [height * width - i - 1]
* Since element at [height * width - i - 1] would move to position [i],
* we can just swap elements [i] and [height * width - i - 1].
*/
void TouchVideoFrame::rotate180() {
if (mData.size() == 0) {
return;
}
// Just need to swap elements i and (height * width - 1 - i)
for (size_t i = 0; i < mData.size() / 2; i++) {
std::swap(mData[i], mData[mHeight * mWidth - 1 - i]);
}
}
} // namespace android
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