Method ImportTextureStb

Source/Engine/Tools/TextureTool/TextureTool.stb.cpp:342–560

}

bool TextureTool::ImportTextureStb(ImageType type, const StringView& path, TextureData& textureData, bool& hasAlpha)
{
    Array<byte> fileData;
    if (File::ReadAllBytes(path, fileData))
    {
        LOG(Warning, "Failed to read data from file.");
        return true;
    }

    switch (type)
    {
    case ImageType::PNG:
    case ImageType::BMP:
    case ImageType::GIF:
    case ImageType::JPEG:
    case ImageType::HDR:
    case ImageType::TGA:
    {
        int width, height, components;
        stbi_uc* stbData = stbi_load_from_memory(fileData.Get(), fileData.Count(), &width, &height, &components, 4);
        if (!stbData)
        {
            LOG(Warning, "Failed to load image. {0}", String(stbi_failure_reason()));
            return false;
        }
        fileData.Resize(0);

        // Setup texture data
        textureData.Width = width;
        textureData.Height = height;
        textureData.Depth = 1;
        textureData.Format = PixelFormat::R8G8B8A8_UNorm;
        textureData.Items.Resize(1);
        textureData.Items[0].Mips.Resize(1);
        auto& mip = textureData.Items[0].Mips[0];
        mip.RowPitch = sizeof(Color32) * width;
        mip.DepthPitch = mip.RowPitch * height;
        mip.Lines = height;
        mip.Data.Copy(stbData, mip.DepthPitch);

#if USE_EDITOR
        // Detect alpha channel usage
        auto ptrAlpha = (Color32*)mip.Data.Get();
        for (int32 y = 0; y < height && !hasAlpha; y++)
        {
            for (int32 x = 0; x < width && !hasAlpha; x++)
            {
                hasAlpha |= ptrAlpha->A < 255;
                ptrAlpha++;
            }
        }
#endif
        stbi_image_free(stbData);
        break;
    }
    case ImageType::RAW:
    {
        // Assume 16-bit, grayscale .RAW file in little-endian byte order