Function loadDDS

Source/Falcor/Utils/Image/ImageIO.cpp:523–554

Loads the information and data for the specified image. This function does not handle creation of the texture for the image.

// Loads the information and data for the specified image. This function does not handle creation of the texture for the image.
void loadDDS(const std::filesystem::path& path, bool loadAsSrgb, ImportData& data)
{
    MemoryMappedFile file(path, MemoryMappedFile::kWholeFile, MemoryMappedFile::AccessHint::SequentialScan);
    if (!file.isOpen())
    {
        FALCOR_THROW("Failed to open file.");
    }

    if (file.getSize() < (sizeof(uint32_t) + sizeof(DDS_HEADER)))
    {
        FALCOR_THROW("Failed to read DDS header (file too small).");
    }

    // Read the DDS header
    const size_t maxHeaderSize = sizeof(uint32_t) + sizeof(DDS_HEADER) + sizeof(DDS_HEADER_DXT10);
    uint8_t header[maxHeaderSize] = {};
    size_t headerSize = maxHeaderSize;

    // The actual header size may be smaller than the max size; be sure not to read past the end of the file.
    std::memcpy(header, file.getData(), std::min<size_t>(file.getSize(), headerSize));
    readDDSHeader(data, header, headerSize, loadAsSrgb);

    if (file.getSize() <= headerSize)
    {
        FALCOR_THROW("No image data after DDS header.");
    }

    // Read image data.
    size_t imageSize = file.getSize() - headerSize;
    data.imageData.resize(imageSize);
    std::memcpy(data.imageData.data(), reinterpret_cast<const uint8_t*>(file.getData()) + headerSize, imageSize);
}
} // namespace

Bitmap::UniqueConstPtr ImageIO::loadBitmapFromDDS(const std::filesystem::path& path)