Simple_Video_Editor/invertChannel.cpp at main · SatapasT/Simple_Video_Editor · GitHub

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#include "videoFunction.h"
#include "multithread.h"

using namespace std;

void InvertChannel(
    Video &video,
    const string &optimisationFlag,
    const int &channel) {
  if (optimisationFlag == "-S") {
    multiThread(
        video, [&](int64_t startFrame, int64_t endFrame)
        { InvertChannelSpeed(
              ref(video), startFrame, endFrame, cref(channel)); });
  } else if (optimisationFlag == "-M") {
    InvertChannelMemory(video, channel);
  } else {
    InvertChannelVanilla(ref(video), cref(channel));
  }
}

void InvertChannelSpeed(
    Video &video,
    int64_t startFrame,
    int64_t endFrame,
    const int &channel) {
  for (int64_t frameIndex = startFrame; frameIndex < endFrame; frameIndex++) {
    Frame &currentFrame = video.frames[frameIndex];

    for (int64_t yPosition = 0; yPosition < video.height; yPosition++) {
      for (int64_t xPosition = 0; xPosition < video.width; xPosition++) {
        unsigned char pixel = video.getPixelValue(
            currentFrame, xPosition, yPosition, channel);

        // Invert the pixel if assuming pixel value range from 0 - 255
        int invertedPixel = 255 - pixel;
        video.writePixel(
            invertedPixel, currentFrame, xPosition, yPosition, channel);
      }
    }
  }
}

void InvertChannelMemory(Video &video, const int &channel) {
  for (int64_t frameIndex = 0; frameIndex < video.numFrames; frameIndex++) {
    Frame currentFrame = readFrameFromFile(video, frameIndex);

    for (int64_t yPosition = 0; yPosition < video.height; yPosition++) {
      for (int64_t xPosition = 0; xPosition < video.width; xPosition++) {
        int64_t pixelPosition = video.getPixelPosition(
            currentFrame, xPosition, yPosition, channel);
        unsigned char &pixelRef = currentFrame.pixels[pixelPosition];

        // Invert the pixel if assuming pixel value range from 0 - 255
        int invertedPixel = 255 - static_cast<int>(pixelRef);
        pixelRef = static_cast<unsigned char>(invertedPixel);
      }
    }
    writeFrameToFile(video, currentFrame);
  }
}

void InvertChannelVanilla(Video &video, const int &channel) {
  for (int64_t frameIndex = 0; frameIndex < video.numFrames; frameIndex++) {
    Frame &currentFrame = video.frames[frameIndex];

    for (int64_t yPosition = 0; yPosition < video.height; yPosition++) {
      for (int64_t xPosition = 0; xPosition < video.width; xPosition++) {
        int64_t pixelPosition = video.getPixelPosition(
            currentFrame, xPosition, yPosition, channel);
        unsigned char &pixelRef = currentFrame.pixels[pixelPosition];

        // Invert the pixel if assuming pixel value range from 0 - 255
        int invertedPixel = 255 - static_cast<int>(pixelRef);
        pixelRef = static_cast<unsigned char>(invertedPixel);
      }
    }
  }
}