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9fd1223992
CSS filters work similarly to canvas filters, so it makes sense to have Gfx::Filter that can be used by both libraries in an analogous way as Gfx::Color.
124 lines
4 KiB
C++
124 lines
4 KiB
C++
/*
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* Copyright (c) 2018-2022, Andreas Kling <andreas@ladybird.org>
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*
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* SPDX-License-Identifier: BSD-2-Clause
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*/
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#include <LibWeb/Layout/ImageBox.h>
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#include <LibWeb/Painting/SVGSVGPaintable.h>
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namespace Web::Painting {
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GC_DEFINE_ALLOCATOR(SVGSVGPaintable);
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GC::Ref<SVGSVGPaintable> SVGSVGPaintable::create(Layout::SVGSVGBox const& layout_box)
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{
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return layout_box.heap().allocate<SVGSVGPaintable>(layout_box);
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}
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SVGSVGPaintable::SVGSVGPaintable(Layout::SVGSVGBox const& layout_box)
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: PaintableBox(layout_box)
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{
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}
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Layout::SVGSVGBox const& SVGSVGPaintable::layout_box() const
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{
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return static_cast<Layout::SVGSVGBox const&>(layout_node());
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}
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void SVGSVGPaintable::before_children_paint(PaintContext& context, PaintPhase phase) const
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{
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PaintableBox::before_children_paint(context, phase);
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if (phase != PaintPhase::Foreground)
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return;
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context.display_list_recorder().push_scroll_frame_id(scroll_frame_id());
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}
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void SVGSVGPaintable::after_children_paint(PaintContext& context, PaintPhase phase) const
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{
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PaintableBox::after_children_paint(context, phase);
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if (phase != PaintPhase::Foreground)
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return;
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context.display_list_recorder().pop_scroll_frame_id();
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}
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static Gfx::FloatMatrix4x4 matrix_with_scaled_translation(Gfx::FloatMatrix4x4 matrix, float scale)
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{
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auto* m = matrix.elements();
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m[0][3] *= scale;
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m[1][3] *= scale;
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m[2][3] *= scale;
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return matrix;
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}
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void SVGSVGPaintable::paint_svg_box(PaintContext& context, PaintableBox const& svg_box, PaintPhase phase)
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{
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auto const& computed_values = svg_box.computed_values();
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auto const& filter = svg_box.computed_values().filter();
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auto masking_area = svg_box.get_masking_area();
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auto needs_to_save_state = svg_box.has_css_transform() || svg_box.get_masking_area().has_value();
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if (needs_to_save_state) {
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context.display_list_recorder().save();
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}
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if (computed_values.opacity() < 1) {
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context.display_list_recorder().apply_opacity(computed_values.opacity());
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}
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if (!filter.is_empty()) {
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context.display_list_recorder().apply_filters(filter);
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}
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if (svg_box.has_css_transform()) {
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auto transform_matrix = svg_box.transform();
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Gfx::FloatPoint transform_origin = svg_box.transform_origin().template to_type<float>();
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auto to_device_pixels_scale = float(context.device_pixels_per_css_pixel());
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context.display_list_recorder().apply_transform(transform_origin.scaled(to_device_pixels_scale), matrix_with_scaled_translation(transform_matrix, to_device_pixels_scale));
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}
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if (masking_area.has_value()) {
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if (masking_area->is_empty())
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return;
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auto mask_bitmap = svg_box.calculate_mask(context, *masking_area);
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if (mask_bitmap) {
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auto source_paintable_rect = context.enclosing_device_rect(*masking_area).template to_type<int>();
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auto origin = source_paintable_rect.location();
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context.display_list_recorder().apply_mask_bitmap(origin, mask_bitmap.release_nonnull(), *svg_box.get_mask_type());
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}
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}
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svg_box.before_paint(context, PaintPhase::Foreground);
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svg_box.paint(context, PaintPhase::Foreground);
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svg_box.after_paint(context, PaintPhase::Foreground);
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paint_descendants(context, svg_box, phase);
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if (!filter.is_empty()) {
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context.display_list_recorder().restore();
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}
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if (computed_values.opacity() < 1) {
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context.display_list_recorder().restore();
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}
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if (needs_to_save_state) {
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context.display_list_recorder().restore();
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}
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}
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void SVGSVGPaintable::paint_descendants(PaintContext& context, PaintableBox const& paintable, PaintPhase phase)
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{
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if (phase != PaintPhase::Foreground)
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return;
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paintable.before_children_paint(context, PaintPhase::Foreground);
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paintable.for_each_child_of_type<PaintableBox>([&](PaintableBox& child) {
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paint_svg_box(context, child, phase);
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return IterationDecision::Continue;
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});
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paintable.after_children_paint(context, PaintPhase::Foreground);
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}
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}
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