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LibWeb: Add initial support for SVG <textPath>

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This patch adds basic support for the SVG `<textPath>`, so it supports
placing text along a path, but none of the extra attributes for
controlling the layout of the text. This is enough to correctly display
the MDN example.
This commit is contained in:
MacDue 2023-12-17 18:35:21 +00:00 • committed by Andreas Kling
parent d327104910
commit 809c5b0b03
11 changed files with 171 additions and 0 deletions
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15
Userland/Libraries/LibWeb/Layout/SVGFormattingContext.cpp
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@ -9,11 +9,14 @@
#include <AK/Debug.h>
#include <LibGfx/BoundingBox.h>
#include <LibGfx/Font/ScaledFont.h>
#include <LibGfx/TextLayout.h>
#include <LibWeb/Layout/BlockFormattingContext.h>
#include <LibWeb/Layout/SVGFormattingContext.h>
#include <LibWeb/Layout/SVGGeometryBox.h>
#include <LibWeb/Layout/SVGSVGBox.h>
#include <LibWeb/Layout/SVGTextBox.h>
#include <LibWeb/Layout/SVGTextPathBox.h>
#include <LibWeb/SVG/SVGForeignObjectElement.h>
#include <LibWeb/SVG/SVGGElement.h>
#include <LibWeb/SVG/SVGMaskElement.h>
@ -253,6 +256,18 @@ void SVGFormattingContext::run(Box const& box, LayoutMode layout_mode, Available
path.move_to(text_offset);
path.text(text_utf8, font);
} else if (is<SVGTextPathBox>(descendant)) {
auto& text_path_element = static_cast<SVG::SVGTextPathElement&>(dom_node);
auto path_or_shape = text_path_element.path_or_shape();
if (!path_or_shape)
return IterationDecision::Continue;
auto& font = graphics_box.first_available_font();
auto text_contents = text_path_element.text_contents();
Utf8View text_utf8 { text_contents };
auto shape_path = const_cast<SVG::SVGGeometryElement&>(*path_or_shape).get_path();
path = shape_path.place_text_along(text_utf8, font);
}
auto path_bounding_box = to_css_pixels_transform.map(path.bounding_box()).to_type<CSSPixels>();