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LibWeb: Support transforms, stroking, gradients, etc for SVG <text>

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This makes use of the new Gfx::Path::text() to handle SVG text elements,
with this text is just a regular path, and can be manipulated like any
other graphics element.

This removes the SVGTextPaintable and makes both <text> and geometry
elements use a new (shared) SVGPathPaintable. This is identical to the
old SVGGeometryPaintable. This simplifies painting as once something is
resolved to a Gfx::Path, the painting logic is the same.
This commit is contained in:
MacDue 2023-11-04 21:31:35 +00:00 • committed by Alexander Kalenik
parent 50d33f79fa
commit 4c5d48f861
30 changed files with 144 additions and 180 deletions
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34
Userland/Libraries/LibWeb/Layout/SVGFormattingContext.cpp
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@ -196,27 +196,20 @@ void SVGFormattingContext::run(Box const& box, LayoutMode layout_mode, Available
graphics_box_state.set_computed_svg_transforms(Painting::SVGGraphicsPaintable::ComputedTransforms(viewbox_transform, svg_transform));
auto to_css_pixels_transform = Gfx::AffineTransform {}.multiply(viewbox_transform).multiply(svg_transform);
Gfx::Path path;
if (is<SVGGeometryBox>(descendant)) {
auto path = static_cast<SVG::SVGGeometryElement&>(dom_node).get_path();
auto path_bounding_box = to_css_pixels_transform.map(path.bounding_box()).to_type<CSSPixels>();
// Stroke increases the path's size by stroke_width/2 per side.
CSSPixels stroke_width = CSSPixels::nearest_value_for(graphics_box.dom_node().visible_stroke_width() * viewbox_transform.x_scale());
path_bounding_box.inflate(stroke_width, stroke_width);
graphics_box_state.set_content_offset(path_bounding_box.top_left());
graphics_box_state.set_content_width(path_bounding_box.width());
graphics_box_state.set_content_height(path_bounding_box.height());
graphics_box_state.set_computed_svg_path(move(path));
path = static_cast<SVG::SVGGeometryElement&>(dom_node).get_path();
} else if (is<SVGTextBox>(descendant)) {
auto& text_element = static_cast<SVG::SVGTextPositioningElement&>(dom_node);
// FIXME: Support arbitrary path transforms for fonts.
// FIMXE: This assumes transform->x_scale() == transform->y_scale().
auto& scaled_font = graphics_box.scaled_font(to_css_pixels_transform.x_scale());
auto& font = graphics_box.font();
auto text_contents = text_element.text_contents();
Utf8View text_utf8 { text_contents };
auto text_width = font.width(text_utf8);
auto text_offset = text_element.get_offset().transformed(to_css_pixels_transform).to_type<CSSPixels>();
auto text_width = CSSPixels::nearest_value_for(scaled_font.width(Utf8View { text_contents }));
auto text_offset = text_element.get_offset();
// https://svgwg.org/svg2-draft/text.html#TextAnchoringProperties
switch (text_element.text_anchor().value_or(SVG::TextAnchor::Start)) {
case SVG::TextAnchor::Start:
@ -240,11 +233,18 @@ void SVGFormattingContext::run(Box const& box, LayoutMode layout_mode, Available
VERIFY_NOT_REACHED();
}
auto text_height = CSSPixels::nearest_value_for(scaled_font.pixel_size());
graphics_box_state.set_content_offset(text_offset.translated(0, -text_height));
graphics_box_state.set_content_width(text_width);
graphics_box_state.set_content_height(text_height);
path.move_to(text_offset);
path.text(text_utf8, font);
}
auto path_bounding_box = to_css_pixels_transform.map(path.bounding_box()).to_type<CSSPixels>();
// Stroke increases the path's size by stroke_width/2 per side.
CSSPixels stroke_width = CSSPixels::nearest_value_for(graphics_box.dom_node().visible_stroke_width() * viewbox_transform.x_scale());
path_bounding_box.inflate(stroke_width, stroke_width);
graphics_box_state.set_content_offset(path_bounding_box.top_left());
graphics_box_state.set_content_width(path_bounding_box.width());
graphics_box_state.set_content_height(path_bounding_box.height());
graphics_box_state.set_computed_svg_path(move(path));
} else if (is<SVGSVGBox>(descendant)) {
SVGFormattingContext nested_context(m_state, static_cast<SVGSVGBox const&>(descendant), this);
nested_context.run(static_cast<SVGSVGBox const&>(descendant), layout_mode, available_space);