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LibWeb: Let Paintable perform the painting

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This patch adds a bunch of Paintable subclasses, each corresponding to
the Layout::Node subclasses that had a paint() override. All painting
logic is moved from layout nodes into their corresponding paintables.

Paintables are now created by asking a Layout::Box to produce one:

    static NonnullOwnPtr<Paintable> Layout::Box::create_paintable()

Note that inline nodes still have their painting logic. Since they
are not boxes, and all paintables have a corresponding box, we'll need
to come up with some other solution for them.
This commit is contained in:
Andreas Kling 2022-03-10 14:02:25 +01:00
parent f6497b64ac
commit 02b316fd5c
64 changed files with 1307 additions and 602 deletions
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81
Userland/Libraries/LibWeb/Painting/MarkerPaintable.cpp Normal file
View file

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/*
* Copyright (c) 2018-2022, Andreas Kling <kling@serenityos.org>
*
* SPDX-License-Identifier: BSD-2-Clause
*/
#include <LibGfx/StylePainter.h>
#include <LibWeb/Layout/ListItemMarkerBox.h>
#include <LibWeb/Painting/MarkerPaintable.h>
namespace Web::Painting {
NonnullOwnPtr<MarkerPaintable> MarkerPaintable::create(Layout::ListItemMarkerBox const& layout_box)
{
return adopt_own(*new MarkerPaintable(layout_box));
}
MarkerPaintable::MarkerPaintable(Layout::ListItemMarkerBox const& layout_box)
: Paintable(layout_box)
{
}
Layout::ListItemMarkerBox const& MarkerPaintable::layout_box() const
{
return static_cast<Layout::ListItemMarkerBox const&>(m_layout_box);
}
void MarkerPaintable::paint(PaintContext& context, PaintPhase phase) const
{
if (phase != PaintPhase::Foreground)
return;
auto enclosing = enclosing_int_rect(absolute_rect());
if (auto const* list_style_image = layout_box().list_style_image_bitmap()) {
context.painter().blit(enclosing.location(), *list_style_image, list_style_image->rect());
return;
}
auto color = computed_values().color();
int marker_width = (int)enclosing.height() / 2;
Gfx::IntRect marker_rect { 0, 0, marker_width, marker_width };
marker_rect.center_within(enclosing);
switch (layout_box().list_style_type()) {
case CSS::ListStyleType::Square:
context.painter().fill_rect(marker_rect, color);
break;
case CSS::ListStyleType::Circle:
// For some reason for draw_ellipse() the ellipse is outside of the rect while for fill_ellipse() the ellipse is inside.
// Scale the marker_rect with sqrt(2) to get an ellipse arc (circle) that appears as if it was inside of the marker_rect.
marker_rect.set_height(marker_rect.height() / 1.41);
marker_rect.set_width(marker_rect.width() / 1.41);
marker_rect.center_within(enclosing);
context.painter().draw_ellipse_intersecting(marker_rect, color);
break;
case CSS::ListStyleType::Disc:
context.painter().fill_ellipse(marker_rect, color);
break;
case CSS::ListStyleType::Decimal:
case CSS::ListStyleType::DecimalLeadingZero:
case CSS::ListStyleType::LowerAlpha:
case CSS::ListStyleType::LowerLatin:
case CSS::ListStyleType::LowerRoman:
case CSS::ListStyleType::UpperAlpha:
case CSS::ListStyleType::UpperLatin:
case CSS::ListStyleType::UpperRoman:
if (layout_box().text().is_null())
break;
context.painter().draw_text(enclosing, layout_box().text(), Gfx::TextAlignment::Center);
break;
case CSS::ListStyleType::None:
return;
default:
VERIFY_NOT_REACHED();
}
}
}