Method determineTargetColorSpace

tools/ktx/command_create.cpp:2757–2804

}

void CommandCreate::determineTargetColorSpace(const ImageInput& in, ImageSpec& target, ColorSpaceInfo& colorSpaceInfo) {
    // Primaries handling:
    //
    // 1. Use assign-primaries option value, if set.
    // 2. Use primaries info given by plugin.
    // 3. If no primaries info and input is PNG use PNG spec.
    //    recommendation of BT709/sRGB otherwise leave as
    //    UNSPECIFIED.
    // 4. If convert-primaries is specified but no primaries info is
    //    given by the plugin then fail.
    // 5. If convert-primaries is specified and primaries info determined
    //    above is different then set up conversion.

    determineSourceColorSpace(in, colorSpaceInfo.src);

    // Set Primaries

    // If convert-primaries is specified and primaries info determined
    // above is different then set up conversion.
    if (options.convertPrimaries.has_value()) {
        assert(colorSpaceInfo.src.usedPrimaries != KHR_DF_PRIMARIES_UNSPECIFIED
               && "determineSourceColorSpace failed to check for UNSPECIFIED.");
        target.format().setPrimaries(options.convertPrimaries.value());
        // Okay to set this even if no conversion needed.
        colorSpaceInfo.dst.colorPrimaries = createColorPrimaries(target.format().primaries());
    } else {
        target.format().setPrimaries(colorSpaceInfo.src.usedPrimaries);
    }

    // target transfer is set from the --format value or --assignTF or --convertTF.
    if (options.assignTF.has_value())
        target.format().setTransfer(options.assignTF.value());

    if (options.convertTF.has_value())
        target.format().setTransfer(options.convertTF.value());

    switch (target.format().transfer()) {
    case KHR_DF_TRANSFER_LINEAR:
        colorSpaceInfo.dst.transferFunction = std::make_unique<TransferFunctionLinear>();
        break;
    case KHR_DF_TRANSFER_SRGB:
        colorSpaceInfo.dst.transferFunction = std::make_unique<TransferFunctionSRGB>();
        break;
    default:
        // Lack of will be handled if color transformation attempted.
        colorSpaceInfo.dst.transferFunction = nullptr;
    }
}

void CommandCreate::determineSourceOrigin(const ImageInput& in, ImageSpec::Origin& usedSourceOrigin) {