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

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

using namespace std;

void swapChannel(
    Video &video,
    const string &optimisationFlag,
    const int &channel1,
    const int &channel2) {
  if (optimisationFlag == "-S") {
    multiThread(
        video, [&](int64_t startFrame, int64_t endFrame)
        { swapChannelSpeed(ref(video), startFrame, endFrame,
                           cref(channel1), cref(channel2)); });
  } else if (optimisationFlag == "-M") {
    swapChannelMemory(ref(video), cref(channel1), cref(channel2));
  } else {
    swapChannelVanilla(ref(video), cref(channel1), cref(channel2));
  }
}

void swapChannelSpeed(
    Video &video,
    const int64_t startFrame,
    const int64_t endFrame,
    const int channel1,
    const int channel2) {
  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 pixel1 = video.getPixelValue(
            currentFrame, xPosition, yPosition, channel1);

        int64_t pixel2Position = video.getPixelPosition(
            currentFrame, xPosition, yPosition, channel2);
        unsigned char &pixel2Ref = currentFrame.pixels[pixel2Position];

        // Swap the pixel between the 2 channel
        video.writePixel(
            pixel2Ref, currentFrame, xPosition, yPosition, channel1);
        pixel2Ref = pixel1;
      }
    }
  }
}

void swapChannelMemory(
    Video &video,
    const int channel1,
    const int channel2) {
  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++) {
        // Alway need to create a copy otherwise they overwrite eachother
        unsigned char pixel1 = video.getPixelValue(
            currentFrame, xPosition, yPosition, channel1);

        int64_t pixel2Position = video.getPixelPosition(
            currentFrame, xPosition, yPosition, channel2);
        unsigned char &pixel2Ref = currentFrame.pixels[pixel2Position];

        video.writePixel(
            pixel2Ref, currentFrame, xPosition, yPosition, channel1);
        pixel2Ref = pixel1;
      }
    }
    writeFrameToFile(video, currentFrame);
  }
}

void swapChannelVanilla(
    Video &video,
    const int channel1,
    const int channel2) {
  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) {
        // Alway need to create a copy otherwise they overwrite eachother
        unsigned char pixel1 = video.getPixelValue(
            currentFrame, xPosition, yPosition, channel1);

        int64_t pixel2Position = video.getPixelPosition(
            currentFrame, xPosition, yPosition, channel2);
        unsigned char &pixel2Ref = currentFrame.pixels[pixel2Position];

        // Swap the pixel between the 2 channel
        video.writePixel(
            pixel2Ref, currentFrame, xPosition, yPosition, channel1);
        pixel2Ref = pixel1;
      }
    }
  }
}