Method snapshotView

valdi/src/valdi/snap_drawing/SnapDrawingViewTransaction.cpp:197–255

void SnapDrawingViewTransaction::cancelAllViewAnimations(const Ref<View>& view) {}

void SnapDrawingViewTransaction::willEnqueueViewToPool(const Ref<View>& view, Valdi::Function<void(View&)> onEnqueue) {
    auto snapDrawingView = toLayer(view);
    if (snapDrawingView == nullptr) {
        return;
    }
    snapDrawingView->setAttachedData(nullptr);

    snapDrawingView->prepareForReuse();
    snapDrawingView->removeAllAnimations();

    onEnqueue(*view);
}

void SnapDrawingViewTransaction::snapshotView(const Ref<View>& view,
                                              Valdi::Function<void(Valdi::Result<Valdi::BytesView>)> cb) {
    auto layer = toLayer(view);
    if (layer == nullptr) {
        cb(Valdi::Error(STRING_LITERAL("View is not a SnapDrawing layer")));
        return;
    }

    auto bridgeLayer = Valdi::castOrNull<BridgeLayer>(layer);
    if (bridgeLayer != nullptr) {
        auto viewNode = snap::drawing::valdiViewNodeFromLayer(*bridgeLayer);
        auto innerView = bridgeLayer->getBridgedView();
        if (viewNode != nullptr && innerView != nullptr) {
            innerView->getViewTransaction(viewNode->getViewNodeTree())
                .snapshotView(innerView->getView(), std::move(cb));
        } else {
            cb(Valdi::Error(STRING_LITERAL("BridgeLayer does not have associated View")));
        }

        return;
    }

    auto root = dynamic_cast<LayerRoot*>(layer->getRoot());
    auto scale = (root != nullptr) ? root->getScale() : 1.0f;

    auto viewWidth = layer->getFrame().width() * scale;
    auto viewHeight = layer->getFrame().height() * scale;

    if (viewWidth < 1 || viewHeight < 1) {
        cb(Valdi::Error(STRING_FORMAT("View is too small: {}x{}", viewWidth, viewHeight)));
        return;
    }

    auto iViewWidth = static_cast<uint32_t>(viewWidth);
    auto iViewHeight = static_cast<uint32_t>(viewHeight);

    BitmapGraphicsContext graphicsContext;
    auto surface = graphicsContext.createBitmapSurface(
        Valdi::BitmapInfo(iViewWidth, iViewHeight, Valdi::ColorTypeRGBA8888, Valdi::AlphaTypePremul, 0));

    auto canvasResult = surface->prepareCanvas();

    if (!canvasResult) {
        cb(canvasResult.error());
        return;