Function defaultProcessImageFunction

Libraries/Aurora/Source/AssetManager.cpp:134–242

Default process image function. Has extra flipImageY argument that must be filled in.

// Default process image function.
// Has extra flipImageY argument that must be filled in.
bool defaultProcessImageFunction(const vector<unsigned char>& buffer, const string& filename,
    ImageAsset* pImageOut, bool flipImageY)
{
    // Use STB to decode the image buffer.
    // TODO: Image loading will eventually be handled by clients.
    int width, height, components;

    // Is this image HDR?
    bool isHDR = stbi_is_hdr_from_memory(&buffer[0], (int)buffer.size());

    if (isHDR)
    {
        // Don't flip HDR images.
        stbi_set_flip_vertically_on_load(false);

        // Load HDR image as floats.
        float* pPixels =
            stbi_loadf_from_memory(&buffer[0], (int)buffer.size(), &width, &height, &components, 0);

        AU_ASSERT(
            components == 3 || components == 4, "Only RGB and RGBA HDR images currently supported");

        // Fill in Aurora image data struct.
        pImageOut->data.width     = width;
        pImageOut->data.height    = height;
        pImageOut->data.name      = filename;
        pImageOut->data.linearize = false;
        pImageOut->data.format = components == 3 ? ImageFormat::Float_RGB : ImageFormat::Float_RGBA;
        size_t sizeBytes       = static_cast<size_t>(width * height * components * sizeof(float));
        pImageOut->pixels      = make_unique<unsigned char[]>(sizeBytes);
        pImageOut->data.pImageData = pImageOut->pixels.get();
        pImageOut->sizeBytes       = sizeBytes;

        // Copy pixels.
        memcpy(pImageOut->pixels.get(), pPixels, sizeBytes);

        // Free the pixels allocated by STB.
        stbi_image_free(pPixels);
    }
    else
    {

        // Set the flipped flag based on static variable in AssetManager.
        stbi_set_flip_vertically_on_load(flipImageY);

        // Load LDR image as bytes.
        unsigned char* pPixels =
            stbi_load_from_memory(&buffer[0], (int)buffer.size(), &width, &height, &components, 0);

        // Check if image is sRGB (if so set linearize flag.)
        bool isSRGB = isImageSRGB(&buffer[0], (int)buffer.size());

        // Fill in Aurora image data struct.
        pImageOut->data.width      = width;
        pImageOut->data.height     = height;
        pImageOut->data.name       = filename;
        pImageOut->data.linearize  = isSRGB;
        pImageOut->data.format     = ImageFormat::Integer_RGBA;