LibWeb: Remove filter from PushStackingContext

Libraries/LibWeb/Painting/Command.h

@@ -119,7 +119,6 @@ struct StackingContextTransform {
 
 struct PushStackingContext {
     float opacity;
-    CSS::ResolvedFilter filter;
     // The bounding box of the source paintable (pre-transform).
     Gfx::IntRect source_paintable_rect;
     // A translation to be applied after the stacking context has been transformed.

Libraries/LibWeb/Painting/DisplayListPlayerSkia.cpp

@@ -396,33 +396,7 @@ void DisplayListPlayerSkia::push_stacking_context(PushStackingContext const& com
                              .translate(-command.transform.origin);
     auto matrix = to_skia_matrix(new_transform);
 
-    if (!command.filter.is_none()) {
+    if (command.opacity < 1) {
-        sk_sp<SkImageFilter> image_filter;
-        auto append_filter = [&image_filter](auto new_filter) {
-            if (image_filter)
-                image_filter = SkImageFilters::Compose(new_filter, image_filter);
-            else
-                image_filter = new_filter;
-        };
-
-        // Apply filters in order
-        for (auto const& filter_function : command.filter.filters)
-            append_filter(to_skia_image_filter(filter_function));
-
-        // We apply opacity as a color filter here so we only need to save and restore a single layer.
-        if (command.opacity < 1) {
-            append_filter(to_skia_image_filter(CSS::ResolvedFilter::FilterFunction {
-                CSS::ResolvedFilter::Color {
-                    CSS::FilterOperation::Color::Type::Opacity,
-                    command.opacity,
-                },
-            }));
-        }
-
-        SkPaint paint;
-        paint.setImageFilter(image_filter);
-        canvas.saveLayer(nullptr, &paint);
-    } else if (command.opacity < 1) {
         auto source_paintable_rect = to_skia_rect(command.source_paintable_rect);
         SkRect dest;
         matrix.mapRect(&dest, source_paintable_rect);

Libraries/LibWeb/Painting/DisplayListRecorder.cpp

@@ -285,7 +285,6 @@ void DisplayListRecorder::push_stacking_context(PushStackingContextParams params
 {
     append(PushStackingContext {
         .opacity = params.opacity,
-        .filter = params.filter,
         .source_paintable_rect = params.source_paintable_rect,
         .transform = {
             .origin = params.transform.origin,

Libraries/LibWeb/Painting/DisplayListRecorder.h

@@ -111,7 +111,6 @@ public:
 
     struct PushStackingContextParams {
         float opacity;
-        CSS::ResolvedFilter filter;
         bool is_fixed_position;
         Gfx::IntRect source_paintable_rect;
         StackingContextTransform transform;

Libraries/LibWeb/Painting/StackingContext.cpp

@@ -301,7 +301,6 @@ void StackingContext::paint(PaintContext& context) const
 
     DisplayListRecorder::PushStackingContextParams push_stacking_context_params {
         .opacity = opacity,
-        .filter = paintable_box().computed_values().filter(),
         .is_fixed_position = paintable_box().is_fixed_position(),
         .source_paintable_rect = source_paintable_rect,
         .transform = {