dd8504c68d
Instead of TextPaintable fragments being an offset+length view into the layout node, they are now a view into the paintable instead. This removes an awkward time window where we'd have bogus state in text fragments after layout invalidation but before relayout. It also makes the code slightly nicer in general, since there's less mixing of layout and painting concepts.
257 lines
11 KiB
C++
257 lines
11 KiB
C++
/*
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* Copyright (c) 2018-2022, Andreas Kling <kling@serenityos.org>
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*
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* SPDX-License-Identifier: BSD-2-Clause
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*/
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#include <LibGfx/AntiAliasingPainter.h>
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#include <LibWeb/DOM/Document.h>
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#include <LibWeb/Layout/BlockContainer.h>
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#include <LibWeb/Painting/BackgroundPainting.h>
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#include <LibWeb/Painting/InlinePaintable.h>
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#include <LibWeb/Painting/TextPaintable.h>
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namespace Web::Painting {
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JS::NonnullGCPtr<InlinePaintable> InlinePaintable::create(Layout::InlineNode const& layout_node)
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{
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return layout_node.heap().allocate_without_realm<InlinePaintable>(layout_node);
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}
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InlinePaintable::InlinePaintable(Layout::InlineNode const& layout_node)
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: Paintable(layout_node)
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{
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}
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Layout::InlineNode const& InlinePaintable::layout_node() const
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{
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return static_cast<Layout::InlineNode const&>(Paintable::layout_node());
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}
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Optional<int> InlinePaintable::scroll_frame_id() const
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{
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if (m_enclosing_scroll_frame)
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return m_enclosing_scroll_frame->id;
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return {};
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}
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Optional<CSSPixelPoint> InlinePaintable::enclosing_scroll_frame_offset() const
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{
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if (m_enclosing_scroll_frame)
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return m_enclosing_scroll_frame->offset;
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return {};
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}
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Optional<CSSPixelRect> InlinePaintable::clip_rect() const
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{
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if (m_enclosing_clip_frame)
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return m_enclosing_clip_frame->rect();
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return {};
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}
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void InlinePaintable::before_paint(PaintContext& context, PaintPhase) const
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{
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if (scroll_frame_id().has_value()) {
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context.recording_painter().save();
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context.recording_painter().set_scroll_frame_id(scroll_frame_id().value());
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}
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if (clip_rect().has_value()) {
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context.recording_painter().save();
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context.recording_painter().add_clip_rect(context.enclosing_device_rect(*clip_rect()).to_type<int>());
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}
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}
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void InlinePaintable::after_paint(PaintContext& context, PaintPhase) const
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{
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if (clip_rect().has_value())
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context.recording_painter().restore();
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if (scroll_frame_id().has_value())
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context.recording_painter().restore();
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}
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void InlinePaintable::paint(PaintContext& context, PaintPhase phase) const
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{
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auto& painter = context.recording_painter();
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if (phase == PaintPhase::Background) {
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auto containing_block_position_in_absolute_coordinates = containing_block()->absolute_position();
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for_each_fragment([&](auto const& fragment, bool is_first_fragment, bool is_last_fragment) {
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CSSPixelRect absolute_fragment_rect { containing_block_position_in_absolute_coordinates.translated(fragment.offset()), fragment.size() };
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if (is_first_fragment) {
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auto extra_start_width = box_model().padding.left;
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absolute_fragment_rect.translate_by(-extra_start_width, 0);
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absolute_fragment_rect.set_width(absolute_fragment_rect.width() + extra_start_width);
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}
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if (is_last_fragment) {
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auto extra_end_width = box_model().padding.right;
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absolute_fragment_rect.set_width(absolute_fragment_rect.width() + extra_end_width);
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}
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auto const& border_radii_data = fragment.border_radii_data();
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paint_background(context, layout_node(), absolute_fragment_rect, computed_values().background_color(), computed_values().image_rendering(), &computed_values().background_layers(), border_radii_data);
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if (!box_shadow_data().is_empty()) {
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auto borders_data = BordersData {
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.top = computed_values().border_top(),
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.right = computed_values().border_right(),
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.bottom = computed_values().border_bottom(),
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.left = computed_values().border_left(),
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};
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auto absolute_fragment_rect_bordered = absolute_fragment_rect.inflated(
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borders_data.top.width, borders_data.right.width,
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borders_data.bottom.width, borders_data.left.width);
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paint_box_shadow(context, absolute_fragment_rect_bordered, absolute_fragment_rect,
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borders_data, border_radii_data, box_shadow_data());
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}
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return IterationDecision::Continue;
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});
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}
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auto paint_border_or_outline = [&](Optional<BordersData> outline_data = {}, CSSPixels outline_offset = 0) {
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auto borders_data = BordersData {
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.top = computed_values().border_top(),
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.right = computed_values().border_right(),
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.bottom = computed_values().border_bottom(),
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.left = computed_values().border_left(),
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};
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auto containing_block_position_in_absolute_coordinates = containing_block()->absolute_position();
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for_each_fragment([&](auto const& fragment, bool is_first_fragment, bool is_last_fragment) {
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CSSPixelRect absolute_fragment_rect { containing_block_position_in_absolute_coordinates.translated(fragment.offset()), fragment.size() };
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if (is_first_fragment) {
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auto extra_start_width = box_model().padding.left;
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absolute_fragment_rect.translate_by(-extra_start_width, 0);
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absolute_fragment_rect.set_width(absolute_fragment_rect.width() + extra_start_width);
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}
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if (is_last_fragment) {
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auto extra_end_width = box_model().padding.right;
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absolute_fragment_rect.set_width(absolute_fragment_rect.width() + extra_end_width);
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}
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auto borders_rect = absolute_fragment_rect.inflated(borders_data.top.width, borders_data.right.width, borders_data.bottom.width, borders_data.left.width);
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auto border_radii_data = fragment.border_radii_data();
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if (outline_data.has_value()) {
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auto outline_offset_x = outline_offset;
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auto outline_offset_y = outline_offset;
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// "Both the height and the width of the outside of the shape drawn by the outline should not
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// become smaller than twice the computed value of the outline-width property to make sure
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// that an outline can be rendered even with large negative values."
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// https://www.w3.org/TR/css-ui-4/#outline-offset
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// So, if the horizontal outline offset is > half the borders_rect's width then we set it to that.
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// (And the same for y)
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if ((borders_rect.width() / 2) + outline_offset_x < 0)
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outline_offset_x = -borders_rect.width() / 2;
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if ((borders_rect.height() / 2) + outline_offset_y < 0)
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outline_offset_y = -borders_rect.height() / 2;
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border_radii_data.inflate(outline_data->top.width + outline_offset_y, outline_data->right.width + outline_offset_x, outline_data->bottom.width + outline_offset_y, outline_data->left.width + outline_offset_x);
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borders_rect.inflate(outline_data->top.width + outline_offset_y, outline_data->right.width + outline_offset_x, outline_data->bottom.width + outline_offset_y, outline_data->left.width + outline_offset_x);
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context.recording_painter().paint_borders(context.rounded_device_rect(borders_rect), border_radii_data.as_corners(context), outline_data->to_device_pixels(context));
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} else {
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context.recording_painter().paint_borders(context.rounded_device_rect(borders_rect), border_radii_data.as_corners(context), borders_data.to_device_pixels(context));
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}
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return IterationDecision::Continue;
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});
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};
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if (phase == PaintPhase::Border) {
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paint_border_or_outline();
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}
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if (phase == PaintPhase::Outline) {
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auto maybe_outline_data = this->outline_data();
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if (maybe_outline_data.has_value())
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paint_border_or_outline(maybe_outline_data.value(), computed_values().outline_offset().to_px(layout_node()));
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}
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if (phase == PaintPhase::Foreground) {
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for_each_fragment([&](auto const& fragment, bool, bool) {
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if (is<TextPaintable>(fragment.paintable()))
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paint_text_fragment(context, static_cast<TextPaintable const&>(fragment.paintable()), fragment, phase);
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});
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}
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if (phase == PaintPhase::Overlay && layout_node().document().inspected_layout_node() == &layout_node()) {
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// FIXME: This paints a double-thick border between adjacent fragments, where ideally there
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// would be none. Once we implement non-rectangular outlines for the `outline` CSS
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// property, we can use that here instead.
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for_each_fragment([&](auto const& fragment, bool, bool) {
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painter.draw_rect(context.enclosing_device_rect(fragment.absolute_rect()).template to_type<int>(), Color::Magenta);
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return IterationDecision::Continue;
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});
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}
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}
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template<typename Callback>
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void InlinePaintable::for_each_fragment(Callback callback) const
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{
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for (size_t i = 0; i < m_fragments.size(); ++i) {
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auto const& fragment = m_fragments[i];
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callback(fragment, i == 0, i == m_fragments.size() - 1);
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}
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}
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TraversalDecision InlinePaintable::hit_test(CSSPixelPoint position, HitTestType type, Function<TraversalDecision(HitTestResult)> const& callback) const
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{
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if (m_clip_rect.has_value() && !m_clip_rect.value().contains(position))
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return TraversalDecision::Continue;
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auto position_adjusted_by_scroll_offset = position;
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if (enclosing_scroll_frame_offset().has_value())
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position_adjusted_by_scroll_offset.translate_by(-enclosing_scroll_frame_offset().value());
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for (auto const& fragment : m_fragments) {
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if (fragment.paintable().stacking_context())
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continue;
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auto fragment_absolute_rect = fragment.absolute_rect();
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if (fragment_absolute_rect.contains(position_adjusted_by_scroll_offset)) {
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if (fragment.paintable().hit_test(position, type, callback) == TraversalDecision::Break)
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return TraversalDecision::Break;
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auto hit_test_result = HitTestResult { const_cast<Paintable&>(fragment.paintable()), fragment.text_index_at(position_adjusted_by_scroll_offset.x()) };
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if (callback(hit_test_result) == TraversalDecision::Break)
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return TraversalDecision::Break;
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}
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}
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bool should_exit = false;
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for_each_child([&](Paintable const& child) {
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if (should_exit)
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return;
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if (child.stacking_context())
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return;
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if (child.hit_test(position, type, callback) == TraversalDecision::Break)
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should_exit = true;
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});
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if (should_exit)
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return TraversalDecision::Break;
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return TraversalDecision::Continue;
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}
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CSSPixelRect InlinePaintable::bounding_rect() const
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{
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CSSPixelRect bounding_rect;
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for_each_fragment([&](auto const& fragment, bool, bool) {
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auto fragment_absolute_rect = fragment.absolute_rect();
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bounding_rect = bounding_rect.united(fragment_absolute_rect);
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});
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if (bounding_rect.is_empty()) {
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// FIXME: This is adhoc, and we should return rect of empty fragment instead.
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auto containing_block_position_in_absolute_coordinates = containing_block()->absolute_position();
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return { containing_block_position_in_absolute_coordinates, { 0, 0 } };
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}
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return bounding_rect;
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}
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}
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