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https://github.com/RGBCube/serenity
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063e66cae9
This modification introduces a new layer to the painting process. The stacking context traversal no longer immediately calls the Gfx::Painter methods. Instead, it writes serialized painting commands into newly introduced RecordingPainter. Created list of commands is executed later to produce resulting bitmap. Producing painting command list will make it easier to add new optimizations: - It's simpler to check if the painting result is not visible in the viewport at the command level rather than during stacking context traversal. - Run painting in a separate thread. The painting thread can process serialized painting commands, while the main thread can work on the next paintable tree and safely invalidate the previous one. - As we consider GPU-accelerated painting support, it would be easier to back each painting command rather than constructing an alternative for the entire Gfx::Painter API.
105 lines
3.8 KiB
C++
105 lines
3.8 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/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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bool SVGGraphicsPaintable::forms_unconnected_subtree() const
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{
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// Masks should not be painted (i.e. reachable) unless referenced by another element.
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return is<SVG::SVGMaskElement>(dom_node());
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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 = graphics_element.mask();
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if (!mask)
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return {};
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auto target_area = [&] {
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auto mask_units = mask->mask_units();
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if (mask_units == SVG::MaskUnits::UserSpaceOnUse) {
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auto const* svg_element = graphics_element.shadow_including_first_ancestor_of_type<SVG::SVGSVGElement>();
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return svg_element->paintable_box()->absolute_border_box_rect();
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} else {
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VERIFY(mask_units == SVG::MaskUnits::ObjectBoundingBox);
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return absolute_border_box_rect();
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}
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}();
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return mask->resolve_masking_area(target_area);
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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 = graphics_element.mask();
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VERIFY(mask);
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if (mask->mask_content_units() != SVG::MaskContentUnits::UserSpaceOnUse) {
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dbgln("SVG: maskContentUnits=objectBoundingBox is not supported");
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return {};
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}
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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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if (mask && mask->layout_node() && is<PaintableBox>(mask->layout_node()->paintable())) {
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auto& mask_paintable = static_cast<PaintableBox const&>(*mask->layout_node()->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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RecordingPainter painter;
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painter.translate(-mask_rect.location().to_type<int>());
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auto paint_context = context.clone(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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painter.execute(*mask_bitmap);
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}
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}
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return mask_bitmap;
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}
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}
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