InfiniTime/src/components/rle/RleDecoder.cpp

#include "RleDecoder.h"

using namespace Pinetime::Tools;

RleDecoder::RleDecoder(const uint8_t* buffer, size_t size) : buffer {buffer}, size {size} {
}

RleDecoder::RleDecoder(const uint8_t* buffer, size_t size, uint16_t foregroundColor, uint16_t backgroundColor) : RleDecoder {buffer, size} {
  this->foregroundColor = foregroundColor;
  this->backgroundColor = backgroundColor;
}

void RleDecoder::DecodeNext(uint8_t* output, size_t maxBytes) {
  for (; encodedBufferIndex < size; encodedBufferIndex++) {
    uint8_t rl = buffer[encodedBufferIndex] - processedCount;
    while (rl) {
      output[bp] = color >> 8;
      output[bp + 1] = color & 0xff;
      bp += 2;
      rl -= 1;
      processedCount++;

      if (bp >= maxBytes) {
        bp = 0;
        y += 1;
        return;
      }
    }
    processedCount = 0;

    if (color == backgroundColor)
      color = foregroundColor;
    else
      color = backgroundColor;
  }
}