LibWeb: Add option to allocate new bitmap for BorderRadiusCornerClipper

This will be needed for overflow: hidden, that clips things which may
themselves use the BorderRadiusCornerClipper.

Userland/Libraries/LibWeb/Painting/BorderRadiusCornerClipper.cpp

@@ -10,7 +10,7 @@
 
 namespace Web::Painting {
 
-ErrorOr<BorderRadiusCornerClipper> BorderRadiusCornerClipper::create(Gfx::IntRect const& border_rect, BorderRadiiData const& border_radii, CornerClip corner_clip)
+ErrorOr<BorderRadiusCornerClipper> BorderRadiusCornerClipper::create(Gfx::IntRect const& border_rect, BorderRadiiData const& border_radii, CornerClip corner_clip, UseCachedBitmap use_cached_bitmap)
 {
     VERIFY(border_radii.has_any_radius());
 
@@ -28,9 +28,14 @@ ErrorOr<BorderRadiusCornerClipper> BorderRadiusCornerClipper::create(Gfx::IntRec
             top_right.vertical_radius + bottom_right.vertical_radius)
     };
 
-    auto corner_bitmap = get_cached_corner_bitmap(corners_bitmap_size);
-    if (!corner_bitmap)
-        return Error::from_errno(ENOMEM);
+    RefPtr<Gfx::Bitmap> corner_bitmap;
+    if (use_cached_bitmap == UseCachedBitmap::Yes) {
+        corner_bitmap = get_cached_corner_bitmap(corners_bitmap_size);
+        if (!corner_bitmap)
+            return Error::from_errno(ENOMEM);
+    } else {
+        corner_bitmap = TRY(Gfx::Bitmap::try_create(Gfx::BitmapFormat::BGRA8888, corners_bitmap_size));
+    }
 
     CornerData corner_data {
         .corner_radii = {

Userland/Libraries/LibWeb/Painting/BorderRadiusCornerClipper.h

@@ -18,7 +18,12 @@ enum class CornerClip {
 
 class BorderRadiusCornerClipper {
 public:
-    static ErrorOr<BorderRadiusCornerClipper> create(Gfx::IntRect const& border_rect, BorderRadiiData const& border_radii, CornerClip corner_clip = CornerClip::Outside);
+    enum class UseCachedBitmap {
+        Yes,
+        No
+    };
+
+    static ErrorOr<BorderRadiusCornerClipper> create(Gfx::IntRect const& border_rect, BorderRadiiData const& border_radii, CornerClip corner_clip = CornerClip::Outside, UseCachedBitmap use_cached_bitmap = UseCachedBitmap::Yes);
 
     void sample_under_corners(Gfx::Painter& page_painter);
     void blit_corner_clipping(Gfx::Painter& page_painter);