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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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35
Userland/Libraries/LibGfx/Painter.cpp
View file

@ -42,11 +42,6 @@
namespace Gfx {
static bool should_paint_as_space(u32 code_point)
{
return is_ascii_space(code_point) || code_point == 0xa0;
}
ALWAYS_INLINE static Color color_for_format(BitmapFormat format, ARGB32 value)
{
switch (format) {
@ -2478,33 +2473,9 @@ 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)
{
float space_width = font.glyph_width(' ') + font.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 code_point = *code_point_iterator;
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);
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();
draw_glyph_or_emoji(point, code_point_iterator, font, color);
point.translate_by(glyph_width, 0);
last_code_point = code_point;
}
for_each_glyph_position(baseline_start, string, font, [&](GlyphPosition glyph_position) {
draw_glyph_or_emoji(glyph_position.position, glyph_position.it, font, color);
});
}
void Painter::draw_scaled_bitmap_with_transform(IntRect const& dst_rect, Bitmap const& bitmap, FloatRect const& src_rect, AffineTransform const& transform, float opacity, Painter::ScalingMode scaling_mode)