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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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55
Userland/Libraries/LibWeb/Painting/ImagePaintable.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/HTML/HTMLImageElement.h>
#include <LibWeb/Layout/ImageBox.h>
#include <LibWeb/Painting/ImagePaintable.h>
namespace Web::Painting {
NonnullOwnPtr<ImagePaintable> ImagePaintable::create(Layout::ImageBox const& layout_box)
{
return adopt_own(*new ImagePaintable(layout_box));
}
ImagePaintable::ImagePaintable(Layout::ImageBox const& layout_box)
: Paintable(layout_box)
{
}
Layout::ImageBox const& ImagePaintable::layout_box() const
{
return static_cast<Layout::ImageBox const&>(m_layout_box);
}
void ImagePaintable::paint(PaintContext& context, PaintPhase phase) const
{
if (!is_visible())
return;
// FIXME: This should be done at a different level. Also rect() does not include padding etc!
if (!context.viewport_rect().intersects(enclosing_int_rect(absolute_rect())))
return;
Paintable::paint(context, phase);
if (phase == PaintPhase::Foreground) {
if (layout_box().renders_as_alt_text()) {
auto& image_element = verify_cast<HTML::HTMLImageElement>(*dom_node());
context.painter().set_font(Gfx::FontDatabase::default_font());
Gfx::StylePainter::paint_frame(context.painter(), enclosing_int_rect(absolute_rect()), context.palette(), Gfx::FrameShape::Container, Gfx::FrameShadow::Sunken, 2);
auto alt = image_element.alt();
if (alt.is_empty())
alt = image_element.src();
context.painter().draw_text(enclosing_int_rect(absolute_rect()), alt, Gfx::TextAlignment::Center, computed_values().color(), Gfx::TextElision::Right);
} else if (auto bitmap = layout_box().image_loader().bitmap(layout_box().image_loader().current_frame_index())) {
context.painter().draw_scaled_bitmap(rounded_int_rect(absolute_rect()), *bitmap, bitmap->rect(), 1.0f, to_gfx_scaling_mode(computed_values().image_rendering()));
}
}
}
}