mirror of
https://github.com/RGBCube/serenity
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de32b77ceb
This is a part of refactoring towards making the paintable tree independent of the layout tree. Now, instead of transferring text fragments from the layout tree to the paintable tree during the layout commit phase, we allocate separate PaintableFragments that contain only the information necessary for painting. Doing this also allows us to get rid LineBoxes, as they are used only during layout.
218 lines
11 KiB
C++
218 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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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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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()->paintable_box()->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 (auto computed_box_shadow = computed_values().box_shadow(); !computed_box_shadow.is_empty()) {
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Vector<ShadowData> resolved_box_shadow_data;
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resolved_box_shadow_data.ensure_capacity(computed_box_shadow.size());
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for (auto const& layer : computed_box_shadow) {
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resolved_box_shadow_data.empend(
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layer.color,
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layer.offset_x.to_px(layout_node()),
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layer.offset_y.to_px(layout_node()),
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layer.blur_radius.to_px(layout_node()),
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layer.spread_distance.to_px(layout_node()),
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layer.placement == CSS::ShadowPlacement::Outer ? ShadowPlacement::Outer : ShadowPlacement::Inner);
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}
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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, resolved_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()->paintable_box()->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 outline_width = computed_values().outline_width().to_px(layout_node());
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auto maybe_outline_data = borders_data_for_outline(layout_node(), computed_values().outline_color(), computed_values().outline_style(), outline_width);
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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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}
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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<Layout::TextNode>(fragment.layout_node()))
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paint_text_fragment(context, static_cast<Layout::TextNode const&>(fragment.layout_node()), 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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// FIXME: This will be slow if the containing block has a lot of fragments!
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Vector<PaintableFragment const&> fragments;
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verify_cast<PaintableWithLines>(*containing_block()->paintable_box()).for_each_fragment([&](auto& fragment) {
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if (layout_node().is_inclusive_ancestor_of(fragment.layout_node()))
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fragments.append(fragment);
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return IterationDecision::Continue;
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});
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for (size_t i = 0; i < fragments.size(); ++i) {
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auto const& fragment = fragments[i];
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callback(fragment, i == 0, i == fragments.size() - 1);
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}
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}
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void InlinePaintable::mark_contained_fragments()
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{
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verify_cast<PaintableWithLines>(*containing_block()->paintable_box()).for_each_fragment([&](auto& fragment) {
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if (layout_node().is_inclusive_ancestor_of(fragment.layout_node()))
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const_cast<PaintableFragment&>(fragment).set_contained_by_inline_node();
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return IterationDecision::Continue;
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});
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}
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CSSPixelRect InlinePaintable::bounding_rect() const
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{
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auto top = CSSPixels::max();
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auto left = CSSPixels::max();
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auto right = CSSPixels::min();
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auto bottom = CSSPixels::min();
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auto has_fragments = false;
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for_each_fragment([&](auto const& fragment, bool, bool) {
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has_fragments = true;
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auto fragment_absolute_rect = fragment.absolute_rect();
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if (fragment_absolute_rect.top() < top)
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top = fragment_absolute_rect.top();
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if (fragment_absolute_rect.left() < left)
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left = fragment_absolute_rect.left();
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if (fragment_absolute_rect.right() > right)
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right = fragment_absolute_rect.right();
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if (fragment_absolute_rect.bottom() > bottom)
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bottom = fragment_absolute_rect.bottom();
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});
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if (!has_fragments) {
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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()->paintable_box()->absolute_position();
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return { containing_block_position_in_absolute_coordinates, { 0, 0 } };
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}
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return { left, top, right - left, bottom - top };
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}
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}
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