f391ccfe53
Previously, calling `.right()` on a `Gfx::Rect` would return the last column's coordinate still inside the rectangle, or `left + width - 1`. This is called 'endpoint inclusive' and does not make a lot of sense for `Gfx::Rect<float>` where a rectangle of width 5 at position (0, 0) would return 4 as its right side. This same problem exists for `.bottom()`. This changes `Gfx::Rect` to be endpoint exclusive, which gives us the nice property that `width = right - left` and `height = bottom - top`. It enables us to treat `Gfx::Rect<int>` and `Gfx::Rect<float>` exactly the same. All users of `Gfx::Rect` have been updated accordingly.
110 lines
6 KiB
C++
110 lines
6 KiB
C++
/*
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* Copyright (c) 2022, MacDue <macdue@dueutil.tech>
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*
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* SPDX-License-Identifier: BSD-2-Clause
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*/
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#include <LibGfx/Bitmap.h>
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#include <LibGfx/Painter.h>
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#include <LibWeb/Painting/BorderRadiusCornerClipper.h>
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namespace Web::Painting {
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ErrorOr<BorderRadiusCornerClipper> BorderRadiusCornerClipper::create(PaintContext& context, DevicePixelRect const& border_rect, BorderRadiiData const& border_radii, CornerClip corner_clip, UseCachedBitmap use_cached_bitmap)
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{
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VERIFY(border_radii.has_any_radius());
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auto top_left = border_radii.top_left.as_corner(context);
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auto top_right = border_radii.top_right.as_corner(context);
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auto bottom_right = border_radii.bottom_right.as_corner(context);
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auto bottom_left = border_radii.bottom_left.as_corner(context);
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DevicePixelSize corners_bitmap_size {
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max(
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top_left.horizontal_radius + top_right.horizontal_radius,
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bottom_left.horizontal_radius + bottom_right.horizontal_radius),
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max(
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top_left.vertical_radius + bottom_left.vertical_radius,
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top_right.vertical_radius + bottom_right.vertical_radius)
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};
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RefPtr<Gfx::Bitmap> corner_bitmap;
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if (use_cached_bitmap == UseCachedBitmap::Yes) {
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corner_bitmap = get_cached_corner_bitmap(corners_bitmap_size);
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if (!corner_bitmap)
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return Error::from_errno(ENOMEM);
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} else {
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corner_bitmap = TRY(Gfx::Bitmap::create(Gfx::BitmapFormat::BGRA8888, corners_bitmap_size.to_type<int>()));
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}
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CornerData corner_data {
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.corner_radii = {
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.top_left = top_left,
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.top_right = top_right,
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.bottom_right = bottom_right,
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.bottom_left = bottom_left },
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.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) },
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.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 } },
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.corner_bitmap_size = corners_bitmap_size
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};
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return BorderRadiusCornerClipper { corner_data, corner_bitmap.release_nonnull(), corner_clip };
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}
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void BorderRadiusCornerClipper::sample_under_corners(Gfx::Painter& page_painter)
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{
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// Generate a mask for the corners:
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Gfx::Painter corner_painter { *m_corner_bitmap };
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Gfx::AntiAliasingPainter corner_aa_painter { corner_painter };
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Gfx::IntRect corner_rect { { 0, 0 }, m_data.corner_bitmap_size };
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corner_aa_painter.fill_rect_with_rounded_corners(corner_rect, Color::NamedColor::Black,
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m_data.corner_radii.top_left, m_data.corner_radii.top_right, m_data.corner_radii.bottom_right, m_data.corner_radii.bottom_left);
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auto copy_page_masked = [&](Gfx::IntRect const& mask_src, Gfx::IntPoint const& page_location) {
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for (int row = 0; row < mask_src.height(); ++row) {
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for (int col = 0; col < mask_src.width(); ++col) {
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auto corner_location = mask_src.location().translated(col, row);
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auto mask_pixel = m_corner_bitmap->get_pixel(corner_location);
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u8 mask_alpha = mask_pixel.alpha();
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if (m_corner_clip == CornerClip::Outside)
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mask_alpha = ~mask_pixel.alpha();
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auto final_pixel = Color();
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if (mask_alpha > 0) {
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auto page_pixel = page_painter.get_pixel(page_location.translated(col, row));
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if (page_pixel.has_value())
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final_pixel = page_pixel.value().with_alpha(mask_alpha);
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}
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m_corner_bitmap->set_pixel(corner_location, final_pixel);
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}
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}
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};
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// Copy the pixels under the corner mask (using the alpha of the mask):
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if (m_data.corner_radii.top_left)
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copy_page_masked(m_data.corner_radii.top_left.as_rect().translated(m_data.bitmap_locations.top_left.to_type<int>()), m_data.page_locations.top_left.to_type<int>());
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if (m_data.corner_radii.top_right)
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copy_page_masked(m_data.corner_radii.top_right.as_rect().translated(m_data.bitmap_locations.top_right.to_type<int>()), m_data.page_locations.top_right.to_type<int>());
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if (m_data.corner_radii.bottom_right)
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copy_page_masked(m_data.corner_radii.bottom_right.as_rect().translated(m_data.bitmap_locations.bottom_right.to_type<int>()), m_data.page_locations.bottom_right.to_type<int>());
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if (m_data.corner_radii.bottom_left)
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copy_page_masked(m_data.corner_radii.bottom_left.as_rect().translated(m_data.bitmap_locations.bottom_left.to_type<int>()), m_data.page_locations.bottom_left.to_type<int>());
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m_has_sampled = true;
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}
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void BorderRadiusCornerClipper::blit_corner_clipping(Gfx::Painter& painter)
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{
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VERIFY(m_has_sampled);
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// Restore the corners:
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if (m_data.corner_radii.top_left)
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painter.blit(m_data.page_locations.top_left.to_type<int>(), *m_corner_bitmap, m_data.corner_radii.top_left.as_rect().translated(m_data.bitmap_locations.top_left.to_type<int>()));
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if (m_data.corner_radii.top_right)
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painter.blit(m_data.page_locations.top_right.to_type<int>(), *m_corner_bitmap, m_data.corner_radii.top_right.as_rect().translated(m_data.bitmap_locations.top_right.to_type<int>()));
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if (m_data.corner_radii.bottom_right)
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painter.blit(m_data.page_locations.bottom_right.to_type<int>(), *m_corner_bitmap, m_data.corner_radii.bottom_right.as_rect().translated(m_data.bitmap_locations.bottom_right.to_type<int>()));
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if (m_data.corner_radii.bottom_left)
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painter.blit(m_data.page_locations.bottom_left.to_type<int>(), *m_corner_bitmap, m_data.corner_radii.bottom_left.as_rect().translated(m_data.bitmap_locations.bottom_left.to_type<int>()));
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}
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}
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