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LibWeb: Add 'inside' clip mode to BorderRadiusCornerClipper

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The default clip mode 'outside' clips everything outside the corner,
'inside' does the opposite :^)
This commit is contained in:
MacDue 2022-06-20 12:10:24 +01:00 • committed by Linus Groh
parent 08baeb1e7d
commit 13c4c735b8
2 changed files with 14 additions and 5 deletions
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8
Userland/Libraries/LibWeb/Painting/BorderRadiusCornerClipper.cpp
View file

@ -10,7 +10,7 @@
namespace Web::Painting {
ErrorOr<BorderRadiusCornerClipper> BorderRadiusCornerClipper::create(Gfx::IntRect const& border_rect, BorderRadiiData const& border_radii)
ErrorOr<BorderRadiusCornerClipper> BorderRadiusCornerClipper::create(Gfx::IntRect const& border_rect, BorderRadiiData const& border_radii, CornerClip corner_clip)
{
VERIFY(border_radii.has_any_radius());
@ -43,7 +43,7 @@ ErrorOr<BorderRadiusCornerClipper> BorderRadiusCornerClipper::create(Gfx::IntRec
.corner_bitmap_size = corners_bitmap_size
};
return BorderRadiusCornerClipper { corner_data, corner_bitmap.release_nonnull() };
return BorderRadiusCornerClipper { corner_data, corner_bitmap.release_nonnull(), corner_clip };
}
void BorderRadiusCornerClipper::sample_under_corners(Gfx::Painter& page_painter)
@ -60,7 +60,9 @@ void BorderRadiusCornerClipper::sample_under_corners(Gfx::Painter& page_painter)
for (int col = 0; col < mask_src.width(); ++col) {
auto corner_location = mask_src.location().translated(col, row);
auto mask_pixel = m_corner_bitmap->get_pixel(corner_location);
u8 mask_alpha = ~mask_pixel.alpha();
u8 mask_alpha = mask_pixel.alpha();
if (m_corner_clip == CornerClip::Outside)
mask_alpha = ~mask_pixel.alpha();
auto final_pixel = Color();
if (mask_alpha > 0) {
auto page_pixel = page_painter.get_pixel(page_location.translated(col, row));

11
Userland/Libraries/LibWeb/Painting/BorderRadiusCornerClipper.h
View file

@ -11,9 +11,14 @@
namespace Web::Painting {
enum class CornerClip {
Outside,
Inside
};
class BorderRadiusCornerClipper {
public:
static ErrorOr<BorderRadiusCornerClipper> create(Gfx::IntRect const& border_rect, BorderRadiiData const& border_radii);
static ErrorOr<BorderRadiusCornerClipper> create(Gfx::IntRect const& border_rect, BorderRadiiData const& border_radii, CornerClip corner_clip = CornerClip::Outside);
void sample_under_corners(Gfx::Painter& page_painter);
void blit_corner_clipping(Gfx::Painter& page_painter);
@ -40,10 +45,12 @@ private:
NonnullRefPtr<Gfx::Bitmap> m_corner_bitmap;
bool m_has_sampled { false };
CornerClip m_corner_clip { false };
BorderRadiusCornerClipper(CornerData corner_data, NonnullRefPtr<Gfx::Bitmap> corner_bitmap)
BorderRadiusCornerClipper(CornerData corner_data, NonnullRefPtr<Gfx::Bitmap> corner_bitmap, CornerClip corner_clip)
: m_data(move(corner_data))
, m_corner_bitmap(corner_bitmap)
, m_corner_clip(corner_clip)
{
}
};