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LibGfx+LibGUI: Support multi code point emojis in text painting :^)

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This necessitates switching from passing a single code point to the
callback to passing a non-const Utf8CodePointIterator instead.

Note that the text selection mechanisms in LibGUI and LibWeb don't
handle this properly yet; they still assume that each code point
renders as one glyph. Similarly, width calculations for text widths
don't either, so a single such an emoji will require space for more
than one glyph.

It also doesn't work in LibVT's TerminalWidget, where each code point
is handled and rendered separately, so LibGfx never gets a chance to
check if subsequent code points could result in a combined emoji.
This commit is contained in:
Linus Groh 2022-02-22 21:55:01 +00:00
parent e1eb882b1c
commit cab032f1ee
3 changed files with 50 additions and 32 deletions
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10
Userland/Libraries/LibGfx/Painter.h
View file

@ -8,6 +8,7 @@
#include <AK/Forward.h>
#include <AK/NonnullRefPtr.h>
#include <AK/Utf8View.h>
#include <AK/Vector.h>
#include <LibGfx/Color.h>
#include <LibGfx/FontDatabase.h>
@ -75,14 +76,15 @@ public:
void draw_text(IntRect const&, StringView, TextAlignment = TextAlignment::TopLeft, Color = Color::Black, TextElision = TextElision::None, TextWrapping = TextWrapping::DontWrap);
void draw_text(IntRect const&, Utf32View const&, Font const&, TextAlignment = TextAlignment::TopLeft, Color = Color::Black, TextElision = TextElision::None, TextWrapping = TextWrapping::DontWrap);
void draw_text(IntRect const&, Utf32View const&, TextAlignment = TextAlignment::TopLeft, Color = Color::Black, TextElision = TextElision::None, TextWrapping = TextWrapping::DontWrap);
void draw_text(Function<void(IntRect const&, u32)>, IntRect const&, StringView, Font const&, TextAlignment = TextAlignment::TopLeft, TextElision = TextElision::None, TextWrapping = TextWrapping::DontWrap);
void draw_text(Function<void(IntRect const&, u32)>, IntRect const&, Utf8View const&, Font const&, TextAlignment = TextAlignment::TopLeft, TextElision = TextElision::None, TextWrapping = TextWrapping::DontWrap);
void draw_text(Function<void(IntRect const&, u32)>, IntRect const&, Utf32View const&, Font const&, TextAlignment = TextAlignment::TopLeft, TextElision = TextElision::None, TextWrapping = TextWrapping::DontWrap);
void draw_text(Function<void(IntRect const&, Utf8CodePointIterator&)>, IntRect const&, StringView, Font const&, TextAlignment = TextAlignment::TopLeft, TextElision = TextElision::None, TextWrapping = TextWrapping::DontWrap);
void draw_text(Function<void(IntRect const&, Utf8CodePointIterator&)>, IntRect const&, Utf8View const&, Font const&, TextAlignment = TextAlignment::TopLeft, TextElision = TextElision::None, TextWrapping = TextWrapping::DontWrap);
void draw_text(Function<void(IntRect const&, Utf8CodePointIterator&)>, IntRect const&, Utf32View const&, Font const&, TextAlignment = TextAlignment::TopLeft, TextElision = TextElision::None, TextWrapping = TextWrapping::DontWrap);
void draw_ui_text(Gfx::IntRect const&, StringView, Gfx::Font const&, TextAlignment, Gfx::Color);
void draw_glyph(IntPoint const&, u32, Color);
void draw_glyph(IntPoint const&, u32, Font const&, Color);
void draw_emoji(IntPoint const&, Gfx::Bitmap const&, Font const&);
void draw_glyph_or_emoji(IntPoint const&, u32 code_point, Font const&, Color);
void draw_glyph_or_emoji(IntPoint const&, u32, Font const&, Color);
void draw_glyph_or_emoji(IntPoint const&, Utf8CodePointIterator&, Font const&, Color);
void draw_circle_arc_intersecting(IntRect const&, IntPoint const&, int radius, Color, int thickness);
enum class CornerOrientation {