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- /*
- * Copyright (c) 2022, MacDue <macdue@dueutil.tech>
- *
- * SPDX-License-Identifier: BSD-2-Clause
- */
- #include <LibGfx/Bitmap.h>
- #include <LibGfx/Painter.h>
- #include <LibWeb/Painting/BorderRadiusCornerClipper.h>
- #include <LibWeb/Painting/PaintContext.h>
- namespace Web::Painting {
- BorderRadiusSamplingConfig calculate_border_radius_sampling_config(CornerRadii const& corner_radii, Gfx::IntRect const& border_rect)
- {
- auto top_left = corner_radii.top_left;
- auto top_right = corner_radii.top_right;
- auto bottom_right = corner_radii.bottom_right;
- auto bottom_left = corner_radii.bottom_left;
- Gfx::IntSize corners_bitmap_size {
- max(
- max(
- top_left.horizontal_radius + top_right.horizontal_radius,
- top_left.horizontal_radius + bottom_right.horizontal_radius),
- max(
- bottom_left.horizontal_radius + top_right.horizontal_radius,
- bottom_left.horizontal_radius + bottom_right.horizontal_radius)),
- max(
- max(
- top_left.vertical_radius + bottom_left.vertical_radius,
- top_left.vertical_radius + bottom_right.vertical_radius),
- max(
- top_right.vertical_radius + bottom_left.vertical_radius,
- top_right.vertical_radius + bottom_right.vertical_radius))
- };
- BorderRadiusSamplingConfig corner_data {
- .corner_radii = corner_radii,
- .page_locations = { .top_left = border_rect.top_left(), .top_right = border_rect.top_right().translated(-top_right.horizontal_radius, 0), .bottom_right = border_rect.bottom_right().translated(-bottom_right.horizontal_radius, -bottom_right.vertical_radius), .bottom_left = border_rect.bottom_left().translated(0, -bottom_left.vertical_radius) },
- .bitmap_locations = { .top_left = { 0, 0 }, .top_right = { corners_bitmap_size.width() - top_right.horizontal_radius, 0 }, .bottom_right = { corners_bitmap_size.width() - bottom_right.horizontal_radius, corners_bitmap_size.height() - bottom_right.vertical_radius }, .bottom_left = { 0, corners_bitmap_size.height() - bottom_left.vertical_radius } },
- .corners_bitmap_size = corners_bitmap_size,
- };
- return corner_data;
- }
- ErrorOr<NonnullRefPtr<BorderRadiusCornerClipper>> BorderRadiusCornerClipper::create(CornerRadii const& corner_radii, DevicePixelRect const& border_rect, CornerClip corner_clip)
- {
- VERIFY(corner_radii.has_any_radius());
- auto corner_data = calculate_border_radius_sampling_config(corner_radii, border_rect.to_type<int>());
- RefPtr<Gfx::Bitmap> corner_bitmap = TRY(Gfx::Bitmap::create(Gfx::BitmapFormat::BGRA8888, corner_data.corners_bitmap_size));
- return try_make_ref_counted<BorderRadiusCornerClipper>(corner_data, corner_bitmap.release_nonnull(), corner_clip, border_rect);
- }
- void BorderRadiusCornerClipper::sample_under_corners(Gfx::Painter& page_painter)
- {
- // Generate a mask for the corners:
- Gfx::Painter corner_painter { *m_corner_bitmap };
- Gfx::AntiAliasingPainter corner_aa_painter { corner_painter };
- corner_aa_painter.fill_rect_with_rounded_corners(m_corner_bitmap->rect(), Color::NamedColor::Black,
- m_data.corner_radii.top_left, m_data.corner_radii.top_right, m_data.corner_radii.bottom_right, m_data.corner_radii.bottom_left);
- auto copy_page_masked = [&](Gfx::IntRect const& mask_src, Gfx::IntPoint const& page_location) {
- for (int row = 0; row < mask_src.height(); ++row) {
- 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();
- 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));
- if (page_pixel.has_value())
- final_pixel = page_pixel.value().with_alpha(mask_alpha);
- }
- m_corner_bitmap->set_pixel(corner_location, final_pixel);
- }
- }
- };
- // Copy the pixels under the corner mask (using the alpha of the mask):
- if (m_data.corner_radii.top_left)
- copy_page_masked(m_data.corner_radii.top_left.as_rect().translated(m_data.bitmap_locations.top_left), m_data.page_locations.top_left);
- if (m_data.corner_radii.top_right)
- copy_page_masked(m_data.corner_radii.top_right.as_rect().translated(m_data.bitmap_locations.top_right), m_data.page_locations.top_right);
- if (m_data.corner_radii.bottom_right)
- copy_page_masked(m_data.corner_radii.bottom_right.as_rect().translated(m_data.bitmap_locations.bottom_right), m_data.page_locations.bottom_right);
- if (m_data.corner_radii.bottom_left)
- copy_page_masked(m_data.corner_radii.bottom_left.as_rect().translated(m_data.bitmap_locations.bottom_left), m_data.page_locations.bottom_left);
- m_has_sampled = true;
- }
- void BorderRadiusCornerClipper::blit_corner_clipping(Gfx::Painter& painter)
- {
- VERIFY(m_has_sampled);
- // Restore the corners:
- if (m_data.corner_radii.top_left)
- painter.blit(m_data.page_locations.top_left, *m_corner_bitmap, m_data.corner_radii.top_left.as_rect().translated(m_data.bitmap_locations.top_left));
- if (m_data.corner_radii.top_right)
- painter.blit(m_data.page_locations.top_right, *m_corner_bitmap, m_data.corner_radii.top_right.as_rect().translated(m_data.bitmap_locations.top_right));
- if (m_data.corner_radii.bottom_right)
- painter.blit(m_data.page_locations.bottom_right, *m_corner_bitmap, m_data.corner_radii.bottom_right.as_rect().translated(m_data.bitmap_locations.bottom_right));
- if (m_data.corner_radii.bottom_left)
- painter.blit(m_data.page_locations.bottom_left, *m_corner_bitmap, m_data.corner_radii.bottom_left.as_rect().translated(m_data.bitmap_locations.bottom_left));
- }
- ScopedCornerRadiusClip::ScopedCornerRadiusClip(PaintContext& context, DevicePixelRect const& border_rect, BorderRadiiData const& border_radii, CornerClip corner_clip)
- : m_context(context)
- , m_id(context.allocate_corner_clipper_id())
- , m_border_rect(border_rect)
- {
- CornerRadii const corner_radii {
- .top_left = border_radii.top_left.as_corner(context),
- .top_right = border_radii.top_right.as_corner(context),
- .bottom_right = border_radii.bottom_right.as_corner(context),
- .bottom_left = border_radii.bottom_left.as_corner(context)
- };
- m_has_radius = corner_radii.has_any_radius();
- if (!m_has_radius)
- return;
- m_context.recording_painter().sample_under_corners(m_id, corner_radii, border_rect.to_type<int>(), corner_clip);
- }
- ScopedCornerRadiusClip::~ScopedCornerRadiusClip()
- {
- if (!m_has_radius)
- return;
- m_context.recording_painter().blit_corner_clipping(m_id, m_border_rect);
- }
- }
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