Function ByteBuffer ConvertImageBuffer

deps/LLGL/sources/Core/ImageFlags.cpp:639–726

}

LLGL_EXPORT ByteBuffer ConvertImageBuffer(
    const SrcImageDescriptor&   srcImageDesc,
    ImageFormat                 dstFormat,
    DataType                    dstDataType,
    std::size_t                 threadCount)
{
    /* Validate input parameters */
    ValidateSourceImageDesc(srcImageDesc);
    ValidateImageConversionParams(srcImageDesc, dstFormat, dstDataType);

    if (threadCount >= Constants::maxThreadCount)
        threadCount = std::thread::hardware_concurrency();

    /* Initialize destination image descriptor */
    auto srcNumPixels = srcImageDesc.dataSize / (DataTypeSize(srcImageDesc.dataType) * ImageFormatSize(srcImageDesc.format));

    DstImageDescriptor dstImageDesc
    {
        dstFormat,
        dstDataType,
        nullptr,
        srcNumPixels * DataTypeSize(dstDataType) * ImageFormatSize(dstFormat)
    };

    if (srcImageDesc.dataType != dstDataType && srcImageDesc.format != dstFormat)
    {
        auto dstImage = MakeUniqueArray<char>(dstImageDesc.dataSize);
        {
            /* Convert image data type with intermediate buffer */
            auto intermediateBufferSize = srcImageDesc.dataSize / DataTypeSize(srcImageDesc.dataType) * DataTypeSize(dstDataType);
            auto intermediateBuffer     = MakeUniqueArray<char>(intermediateBufferSize);

            ConvertImageBufferDataType(
                srcImageDesc.dataType,
                srcImageDesc.data,
                srcImageDesc.dataSize,
                dstDataType,
                intermediateBuffer.get(),
                intermediateBufferSize,
                threadCount
            );

            /* Set new source buffer and source data type */
            const SrcImageDescriptor intermediateImageDesc
            {
                srcImageDesc.format,
                dstDataType,
                intermediateBuffer.get(),
                intermediateBufferSize
            };

            /* Convert image format */
            dstImageDesc.data = dstImage.get();
            ConvertImageBufferFormat(intermediateImageDesc, dstImageDesc, threadCount);
        }
        return dstImage;
    }
    else if (srcImageDesc.dataType != dstDataType)