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LibGfx+LibWeb: Update for_each_glyph_position to use font cascade list

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This change updates function that builds list of glyphs to use font
cascade list to find font for each code point.
This commit is contained in:
Aliaksandr Kalenik 2023-12-09 23:45:57 +01:00 committed by Andreas Kling
parent 2cb0039a13
commit df57d7ca68
Notes: sideshowbarker 2024-07-17 05:41:34 +09:00 
Author: https://github.com/kalenikaliaksandr
Commit: https://github.com/SerenityOS/serenity/commit/df57d7ca68
Pull-request: https://github.com/SerenityOS/serenity/pull/22236
Issue: https://github.com/SerenityOS/serenity/issues/21213
8 changed files with 66 additions and 16 deletions
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BIN
Tests/LibWeb/Ref/assets/HashSans.woff Normal file
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23
Tests/LibWeb/Ref/reference/unicode-range-ref.html Normal file
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@ -0,0 +1,23 @@
<!DOCTYPE html>
<html>
<head>
<style>
@font-face {
font-family: 'HashFont';
src: url('../assets/HashSans.woff');
}
.hash-font {
font-family: 'HashFont';
}
.text {
font-size: 100px;
font-family: "SerenitySans";
}
</style>
</head>
<body>
<div class="text"><span class="hash-font">A</span>B</div>
</body>
</html>

21
Tests/LibWeb/Ref/unicode-range.html Normal file
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@ -0,0 +1,21 @@
<!DOCTYPE html>
<html>
<head>
<link rel="match" href="reference/unicode-range-ref.html" />
<style>
@font-face {
font-family: 'HashFont';
src: url('assets/HashSans.woff');
unicode-range: U+0041; /* Only letter 'A' */
}
.text {
font-family: 'HashFont', 'SerenitySans';
font-size: 100px;
}
</style>
</head>
<body>
<div class="text">AB</div>
</body>
</html>

4
Userland/Libraries/LibGfx/Painter.cpp
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@ -2439,7 +2439,9 @@ void Painter::draw_text_run(IntPoint baseline_start, Utf8View const& string, Fon
void Painter::draw_text_run(FloatPoint baseline_start, Utf8View const& string, Font const& font, Color color)
{
for_each_glyph_position(baseline_start, string, font, [&](DrawGlyphOrEmoji glyph_or_emoji) {
auto font_list = Gfx::FontCascadeList::create();
font_list->add(font);
for_each_glyph_position(baseline_start, string, font_list, [&](DrawGlyphOrEmoji glyph_or_emoji) {
if (glyph_or_emoji.has<DrawGlyph>()) {
auto& glyph = glyph_or_emoji.get<DrawGlyph>();
draw_glyph(glyph.position, glyph.code_point, *glyph.font, color);

4
Userland/Libraries/LibGfx/Path.cpp
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@ -170,8 +170,10 @@ void Path::text(Utf8View text, Font const& font)
}
auto& scaled_font = static_cast<ScaledFont const&>(font);
auto font_list = Gfx::FontCascadeList::create();
font_list->add(scaled_font);
for_each_glyph_position(
last_point(), text, font, [&](DrawGlyphOrEmoji glyph_or_emoji) {
last_point(), text, font_list, [&](DrawGlyphOrEmoji glyph_or_emoji) {
if (glyph_or_emoji.has<DrawGlyph>()) {
auto& glyph = glyph_or_emoji.get<DrawGlyph>();
move_to(glyph.position);

24
Userland/Libraries/LibGfx/TextLayout.h
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@ -14,6 +14,7 @@
#include <AK/Utf8View.h>
#include <AK/Vector.h>
#include <LibGfx/Font/Font.h>
#include <LibGfx/FontCascadeList.h>
#include <LibGfx/Forward.h>
#include <LibGfx/Rect.h>
#include <LibGfx/TextElision.h>
@ -92,34 +93,35 @@ using DrawGlyphOrEmoji = Variant<DrawGlyph, DrawEmoji>;
Variant<DrawGlyph, DrawEmoji> prepare_draw_glyph_or_emoji(FloatPoint point, Utf8CodePointIterator& it, Font const& font);
template<typename Callback>
void for_each_glyph_position(FloatPoint baseline_start, Utf8View string, Font const& font, Callback callback, IncludeLeftBearing include_left_bearing = IncludeLeftBearing::No, Optional<float&> width = {})
void for_each_glyph_position(FloatPoint baseline_start, Utf8View string, FontCascadeList const& font_list, Callback callback, IncludeLeftBearing include_left_bearing = IncludeLeftBearing::No, Optional<float&> width = {})
{
float space_width = font.glyph_width(' ') + font.glyph_spacing();
float space_width = font_list.first().glyph_width(' ') + font_list.first().glyph_spacing();
u32 last_code_point = 0;
auto point = baseline_start;
point.translate_by(0, -font.pixel_metrics().ascent);
for (auto code_point_iterator = string.begin(); code_point_iterator != string.end(); ++code_point_iterator) {
auto it = code_point_iterator; // The callback function will advance the iterator, so create a copy for this lookup.
auto code_point = *code_point_iterator;
RefPtr<Gfx::Font const> font = font_list.font_for_code_point(code_point);
point.set_y(baseline_start.y() - font->pixel_metrics().ascent);
if (should_paint_as_space(code_point)) {
point.translate_by(space_width, 0);
last_code_point = code_point;
continue;
}
auto kerning = font.glyphs_horizontal_kerning(last_code_point, code_point);
auto kerning = font->glyphs_horizontal_kerning(last_code_point, code_point);
if (kerning != 0.0f)
point.translate_by(kerning, 0);
auto it = code_point_iterator; // The callback function will advance the iterator, so create a copy for this lookup.
auto glyph_width = font.glyph_or_emoji_width(it) + font.glyph_spacing();
auto glyph_or_emoji = prepare_draw_glyph_or_emoji(point, code_point_iterator, font);
auto glyph_width = font->glyph_or_emoji_width(it) + font->glyph_spacing();
auto glyph_or_emoji = prepare_draw_glyph_or_emoji(point, code_point_iterator, *font);
if (include_left_bearing == IncludeLeftBearing::Yes) {
if (glyph_or_emoji.has<DrawGlyph>())
glyph_or_emoji.get<DrawGlyph>().position += FloatPoint(font.glyph_left_bearing(code_point), 0);
glyph_or_emoji.get<DrawGlyph>().position += FloatPoint(font->glyph_left_bearing(code_point), 0);
}
callback(glyph_or_emoji);
@ -129,7 +131,7 @@ void for_each_glyph_position(FloatPoint baseline_start, Utf8View string, Font co
}
if (width.has_value())
*width = point.x() - font.glyph_spacing();
*width = point.x() - font_list.first().glyph_spacing();
}
}

2
Userland/Libraries/LibWeb/Layout/InlineLevelIterator.cpp
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@ -190,7 +190,7 @@ Optional<InlineLevelIterator::Item> InlineLevelIterator::next_without_lookahead(
Vector<Gfx::DrawGlyphOrEmoji> glyph_run;
float glyph_run_width = 0;
Gfx::for_each_glyph_position(
{ 0, 0 }, chunk.view, text_node.first_available_font(), [&](Gfx::DrawGlyphOrEmoji const& glyph_or_emoji) {
{ 0, 0 }, chunk.view, text_node.font_list(), [&](Gfx::DrawGlyphOrEmoji const& glyph_or_emoji) {
glyph_run.append(glyph_or_emoji);
return IterationDecision::Continue;
},

4
Userland/Libraries/LibWeb/Painting/PaintableBox.cpp
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@ -638,12 +638,12 @@ static void paint_text_fragment(PaintContext& context, Layout::TextNode const& t
auto text = text_node.text_for_rendering();
DevicePixelPoint baseline_start { fragment_absolute_device_rect.x(), fragment_absolute_device_rect.y() + context.rounded_device_pixels(fragment.baseline()) };
auto const& scaled_font = fragment.layout_node().scaled_font(context);
Vector<Gfx::DrawGlyphOrEmoji> scaled_glyph_run;
scaled_glyph_run.ensure_capacity(fragment.glyph_run().size());
auto& font_cache = text_node.document().style_computer().font_cache();
for (auto glyph : fragment.glyph_run()) {
glyph.visit([&](auto& glyph) {
glyph.font = scaled_font;
glyph.font = font_cache.scaled_font(*glyph.font, context.device_pixels_per_css_pixel());
glyph.position = glyph.position.scaled(context.device_pixels_per_css_pixel());
});
scaled_glyph_run.append(move(glyph));