Method ResizeStb

Source/Engine/Tools/TextureTool/TextureTool.stb.cpp:929–1014

}

bool TextureTool::ResizeStb(PixelFormat format, TextureMipData& dstMip, const TextureMipData& srcMip, int32 dstMipWidth, int32 dstMipHeight)
{
    // Setup
    auto formatSize = PixelFormatExtensions::SizeInBytes(format);
    auto components = PixelFormatExtensions::ComputeComponentsCount(format);
    auto srcMipWidth = srcMip.RowPitch / formatSize;
    auto srcMipHeight = srcMip.DepthPitch / srcMip.RowPitch;
    auto sampler = PixelFormatSampler::Get(format);

    // Allocate memory
    dstMip.RowPitch = dstMipWidth * formatSize;
    dstMip.DepthPitch = dstMip.RowPitch * dstMipHeight;
    dstMip.Lines = dstMipHeight;
    dstMip.Data.Allocate(dstMip.DepthPitch);

    // Resize texture
    switch (format)
    {
    case PixelFormat::R8_Typeless:
    case PixelFormat::R8_SInt:
    case PixelFormat::R8_SNorm:
    case PixelFormat::R8G8_Typeless:
    case PixelFormat::R8G8_SInt:
    case PixelFormat::R8G8_SNorm:
    case PixelFormat::R8G8B8A8_Typeless:
    case PixelFormat::R8G8B8A8_UNorm:
    case PixelFormat::R8G8B8A8_UInt:
    case PixelFormat::R8G8B8A8_SNorm:
    case PixelFormat::R8G8B8A8_SInt:
    case PixelFormat::B8G8R8A8_UNorm:
    case PixelFormat::B8G8R8X8_Typeless:
    case PixelFormat::B8G8R8X8_UNorm:
    {
        if (!stbir_resize_uint8((const uint8*)srcMip.Data.Get(), srcMipWidth, srcMipHeight, srcMip.RowPitch, (uint8*)dstMip.Data.Get(), dstMipWidth, dstMipHeight, dstMip.RowPitch, components))
        {
            LOG(Warning, "Cannot resize image.");
            return true;
        }
        break;
    }
    case PixelFormat::R8G8B8A8_UNorm_sRGB:
    case PixelFormat::B8G8R8A8_UNorm_sRGB:
    case PixelFormat::B8G8R8X8_UNorm_sRGB:
    {
        auto alphaChannel = format == PixelFormat::B8G8R8X8_UNorm_sRGB ? STBIR_ALPHA_CHANNEL_NONE : 3;
        if (!stbir_resize_uint8_srgb((const uint8*)srcMip.Data.Get(), srcMipWidth, srcMipHeight, srcMip.RowPitch, (uint8*)dstMip.Data.Get(), dstMipWidth, dstMipHeight, dstMip.RowPitch, components, alphaChannel, 0))
        {
            LOG(Warning, "Cannot resize image.");
            return true;
        }
        break;
    }
    case PixelFormat::R32_Typeless:
    case PixelFormat::R32_Float:
    case PixelFormat::R32G32_Float:
    case PixelFormat::R32G32B32_Float:
    case PixelFormat::R32G32B32A32_Float:
    {