Function SaveCompressedTextureSet

tools/cli/NtcCommandLine.cpp:1542–1588

    ntc::Status ntcStatus = context->OpenFile(g_options.saveCompressedFileName, true, outputStream.ptr());
    if (ntcStatus != ntc::Status::Ok)
    {
        fprintf(stderr, "Cannot open output file '%s', code = %s\n%s\n",
            g_options.saveCompressedFileName, ntc::StatusToString(ntcStatus), ntc::GetLastErrorMessage());
        return false;
    }

    ntcStatus = textureSet->ConfigureLosslessCompression(g_options.losslessCompression);
    CHECK_NTC_RESULT(ConfigureLosslessCompression);

    ntc::LosslessCompressionStats losslessStats;
    ntcStatus = textureSet->SaveToStream(outputStream, &losslessStats);
    if (ntcStatus != ntc::Status::Ok)
    {
        fprintf(stderr, "Failed to save compressed texture to output file '%s', code = %s\n%s\n",
            g_options.saveCompressedFileName, ntc::StatusToString(ntcStatus), ntc::GetLastErrorMessage());
        return false;
    }

    uint64_t const fileSize = outputStream->Tell();
    size_t const texturePixels = GetTextureSetPixelCount(textureSet);
    float const bpp = 8.f * float(fileSize) / float(texturePixels);

    printf("Saved '%s'\n", g_options.saveCompressedFileName);
    printf("File size: %" PRIu64 " bytes, %.2f bits per pixel.\n", fileSize, bpp);
    if (g_options.losslessCompression.compressBCModeBuffers || g_options.losslessCompression.compressLatents)
    {
        double const compressedBufferRatioPercents = (losslessStats.originalSizeOfCompressedBuffers == 0) ? 0.0 :
            100.0 * double(losslessStats.sizeOfCompressedBuffers) / double(losslessStats.originalSizeOfCompressedBuffers);

        double const overallCmpressionRatioPercents = 100.0 *
            double(losslessStats.sizeOfCompressedBuffers + losslessStats.sizeOfUncompressedBuffers) /
            double(losslessStats.originalSizeOfCompressedBuffers + losslessStats.sizeOfUncompressedBuffers);

        printf("%s compressed %d buffers out of %d, compressed ratio %.1f%%, overall ratio %.1f%%, time %.2f ms\n",
            ntc::CompressionTypeToString(g_options.losslessCompression.algorithm),
            losslessStats.compressedBuffers, losslessStats.totalBuffers,
            compressedBufferRatioPercents, overallCmpressionRatioPercents, losslessStats.compressionTimeMs);
    }

    return true;
}

ntc::ITextureSet* LoadCompressedTextureSet(ntc::IContext* context)
{
    ntc::ITextureSet* textureSet = nullptr;
    ntc::TextureSetFeatures textureSetFeatures;
    textureSetFeatures.enableCompression = false;
    textureSetFeatures.stagingBytesPerPixel = 16;
    
    ntc::Status ntcStatus = context->CreateCompressedTextureSetFromFile(