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LibGfx: Allow extracting paths from fonts and add Gfx::Path::text()

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This updates fonts so rather than rastering directly to a bitmap, you
can extract paths for glyphs. This is then used to implement a
Gfx::Path::text("some text", font) API, that if given a vector font
appends the path of the text to your Gfx::Path. This then allows
arbitrary manipulation of the text (rotation, skewing, etc), paving the
way for Word Art in Serenity.
This commit is contained in:
MacDue 2023-11-04 21:41:24 +00:00 • committed by Alexander Kalenik
parent b4cabde4a4
commit 50d33f79fa
14 changed files with 186 additions and 88 deletions
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7
Tests/LibGfx/TestFontHandling.cpp
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@ -176,7 +176,7 @@ TEST_CASE(test_character_set_masking)
EXPECT(masked_font->glyph_index(0xFFFD).value() == 0x1FD);
}
TEST_CASE(rasterize_glyph_containing_single_off_curve_point)
TEST_CASE(resolve_glyph_path_containing_single_off_curve_point)
{
Vector<u8> glyph_data {
0, 5, 0, 205, 255, 51, 7, 51, 6, 225, 0, 3, 0, 6, 0, 9, 0, 12, 0, 15, 0, 31, 64, 13, 13, 2, 15, 5, 7, 2, 8, 5, 10, 3, 0,
@ -188,8 +188,9 @@ TEST_CASE(rasterize_glyph_containing_single_off_curve_point)
OpenType::Glyf glyf(glyph_data.span());
auto glyph = glyf.glyph(118);
EXPECT(glyph.has_value());
EXPECT_NO_CRASH("rasterizing glyph containing single off-curve point should not crash", [&] {
(void)glyph->rasterize(0, 0, 1, 1, {}, [&](u16) -> Optional<OpenType::Glyf::Glyph> { VERIFY_NOT_REACHED(); });
EXPECT_NO_CRASH("resolving the path of glyph containing single off-curve point should not crash", [&] {
Gfx::Path path;
(void)glyph->append_path(path, 0, 0, 1, 1, [&](u16) -> Optional<OpenType::Glyf::Glyph> { VERIFY_NOT_REACHED(); });
return Test::Crash::Failure::DidNotCrash;
});
}