Method restoreBwBuffer

lib/GfxRenderer/GfxRenderer.cpp:1846–1871

* This can only be called if `storeBwBuffer` was called prior to the grayscale render. * It should be called to restore the BW buffer state after grayscale rendering is complete. * Uses chunked restoration to match chunked storage. */

 * Uses chunked restoration to match chunked storage.
 */
void GfxRenderer::restoreBwBuffer() {
  // Check if all chunks are allocated
  bool missingChunks = false;
  for (const auto& bwBufferChunk : bwBufferChunks) {
    if (!bwBufferChunk) {
      missingChunks = true;
      break;
    }
  }

  if (missingChunks) {
    freeBwBufferChunks();
    return;
  }

  for (size_t i = 0; i < bwBufferChunks.size(); i++) {
    const size_t offset = i * BW_BUFFER_CHUNK_SIZE;
    const size_t chunkSize = std::min(BW_BUFFER_CHUNK_SIZE, static_cast<size_t>(frameBufferSize - offset));
    memcpy(frameBuffer + offset, bwBufferChunks[i], chunkSize);
  }

  display.cleanupGrayscaleBuffers(frameBuffer);

  freeBwBufferChunks();
  LOG_DBG("GFX", "Restored and freed BW buffer chunks");
}

/**
 * Cleanup grayscale buffers using the current frame buffer.