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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
8 changed files with 66 additions and 16 deletions
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24
Userland/Libraries/LibGfx/TextLayout.h
View file

@ -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();
}
}