163b6bb401
Rather than try to lay out masks normally, this updates the TreeBuilder to create layout nodes for masks as a child of their user (i.e. the masked element). This allows each use of a mask to be laid out differently, which makes supporting `maskContentUnits=objectBoundingBox` fairly easy. The `SVGFormattingContext` is then updated to lay out masks last (as their sizing may depend on their parent), and treats them like viewports. This is pretty ad-hoc, but the SVG specification does not give any guidance on how to actually implement this.
87 lines
3.2 KiB
C++
87 lines
3.2 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 <LibWeb/Layout/ImageBox.h>
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#include <LibWeb/Layout/SVGMaskBox.h>
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#include <LibWeb/Painting/CommandExecutorCPU.h>
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#include <LibWeb/Painting/SVGGraphicsPaintable.h>
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#include <LibWeb/Painting/StackingContext.h>
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#include <LibWeb/SVG/SVGMaskElement.h>
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#include <LibWeb/SVG/SVGSVGElement.h>
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namespace Web::Painting {
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JS::NonnullGCPtr<SVGGraphicsPaintable> SVGGraphicsPaintable::create(Layout::SVGGraphicsBox const& layout_box)
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{
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return layout_box.heap().allocate_without_realm<SVGGraphicsPaintable>(layout_box);
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}
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SVGGraphicsPaintable::SVGGraphicsPaintable(Layout::SVGGraphicsBox const& layout_box)
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: SVGPaintable(layout_box)
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{
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}
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Layout::SVGGraphicsBox const& SVGGraphicsPaintable::layout_box() const
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{
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return static_cast<Layout::SVGGraphicsBox const&>(layout_node());
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}
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Optional<CSSPixelRect> SVGGraphicsPaintable::get_masking_area() const
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{
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auto const& graphics_element = verify_cast<SVG::SVGGraphicsElement const>(*dom_node());
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auto* mask_box = graphics_element.layout_node()->first_child_of_type<Layout::SVGMaskBox>();
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if (!mask_box)
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return {};
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return mask_box->dom_node().resolve_masking_area(mask_box->paintable_box()->absolute_border_box_rect());
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}
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static Gfx::Bitmap::MaskKind mask_type_to_gfx_mask_kind(CSS::MaskType mask_type)
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{
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switch (mask_type) {
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case CSS::MaskType::Alpha:
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return Gfx::Bitmap::MaskKind::Alpha;
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case CSS::MaskType::Luminance:
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return Gfx::Bitmap::MaskKind::Luminance;
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default:
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VERIFY_NOT_REACHED();
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}
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}
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Optional<Gfx::Bitmap::MaskKind> SVGGraphicsPaintable::get_mask_type() const
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{
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auto const& graphics_element = verify_cast<SVG::SVGGraphicsElement const>(*dom_node());
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auto mask = graphics_element.mask();
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if (!mask)
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return {};
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return mask_type_to_gfx_mask_kind(mask->layout_node()->computed_values().mask_type());
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}
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RefPtr<Gfx::Bitmap> SVGGraphicsPaintable::calculate_mask(PaintContext& context, CSSPixelRect const& masking_area) const
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{
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auto const& graphics_element = verify_cast<SVG::SVGGraphicsElement const>(*dom_node());
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auto* mask_box = graphics_element.layout_node()->first_child_of_type<Layout::SVGMaskBox>();
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VERIFY(mask_box);
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auto mask_rect = context.enclosing_device_rect(masking_area);
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RefPtr<Gfx::Bitmap> mask_bitmap = {};
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auto& mask_paintable = static_cast<PaintableBox const&>(*mask_box->paintable());
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auto mask_bitmap_or_error = Gfx::Bitmap::create(Gfx::BitmapFormat::BGRA8888, mask_rect.size().to_type<int>());
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if (mask_bitmap_or_error.is_error())
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return {};
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mask_bitmap = mask_bitmap_or_error.release_value();
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{
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CommandList painting_commands;
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RecordingPainter recording_painter(painting_commands);
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recording_painter.translate(-mask_rect.location().to_type<int>());
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auto paint_context = context.clone(recording_painter);
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paint_context.set_svg_transform(graphics_element.get_transform());
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StackingContext::paint_node_as_stacking_context(mask_paintable, paint_context);
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CommandExecutorCPU executor { *mask_bitmap };
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painting_commands.execute(executor);
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}
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return mask_bitmap;
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}
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}
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