From 063fe5953ada75177c1668f8b805cd9b79724581 Mon Sep 17 00:00:00 2001
From: Kitty Barnett <develop@catznip.com>
Date: Wed, 2 Nov 2022 14:25:27 +0100
Subject: Create a separate segment for emoji characters so that we can display
 them in a slightly larger font size than the surrounding text

---
 indra/llui/lltextbase.cpp | 49 ++++++++++++++++++++++++++++++++++++++++++++---
 indra/llui/lltextbase.h   | 12 ++++++++++++
 2 files changed, 58 insertions(+), 3 deletions(-)

diff --git a/indra/llui/lltextbase.cpp b/indra/llui/lltextbase.cpp
index 0447e7070c..2a6e6901e4 100644
--- a/indra/llui/lltextbase.cpp
+++ b/indra/llui/lltextbase.cpp
@@ -2302,6 +2302,36 @@ void LLTextBase::appendWidget(const LLInlineViewSegment::Params& params, const s
 	insertStringNoUndo(getLength(), widget_wide_text, &segments);
 }
 
+void LLTextBase::createTextWithEmojiSegment(const LLWString& text, S32 segment_start, LLStyleConstSP style, segment_vec_t& segments)
+{
+	LLStyleSP emoji_style;
+
+	S32 text_start = 0, text_kitty = 0, text_len = text.size();
+	for (; text_kitty < text_len; text_kitty++)
+	{
+		if (LLStringOps::isEmoji(text[text_kitty]))
+		{
+			if (text_kitty > text_start)
+			{
+				segments.push_back(new LLNormalTextSegment(style, segment_start + text_start, segment_start + text_kitty, *this));
+			}
+
+			if (!emoji_style)
+			{
+				emoji_style = new LLStyle(*style);
+				emoji_style->setFont(LLFontGL::getFontEmoji());
+			}
+			segments.push_back(new LLEmojiTextSegment(emoji_style, segment_start + text_kitty, segment_start + text_kitty + 1, *this));
+			text_start = text_kitty + 1;
+		}
+	}
+
+	if (text_start < text_len)
+	{
+		segments.push_back(new LLNormalTextSegment(style, segment_start + text_start, segment_start + text_len, *this));
+	}
+}
+
 void LLTextBase::appendAndHighlightTextImpl(const std::string &new_text, S32 highlight_part, const LLStyle::Params& style_params, bool underline_on_hover_only)
 {
 	// Save old state
@@ -2334,6 +2364,7 @@ void LLTextBase::appendAndHighlightTextImpl(const std::string &new_text, S32 hig
 			S32 cur_length = getLength();
 			LLStyleConstSP sp(new LLStyle(highlight_params));
 			LLTextSegmentPtr segmentp;
+			segment_vec_t segments;
 			if (underline_on_hover_only || mSkipLinkUnderline)
 			{
 				highlight_params.font.style("NORMAL");
@@ -2342,9 +2373,8 @@ void LLTextBase::appendAndHighlightTextImpl(const std::string &new_text, S32 hig
 			}
 			else
 			{
-				segmentp = new LLNormalTextSegment(sp, cur_length, cur_length + wide_text.size(), *this);
+				createTextWithEmojiSegment(wide_text, cur_length, sp, segments);
 			}
-			segment_vec_t segments;
 			segments.push_back(segmentp);
 			insertStringNoUndo(cur_length, wide_text, &segments);
 		}
@@ -2367,7 +2397,7 @@ void LLTextBase::appendAndHighlightTextImpl(const std::string &new_text, S32 hig
 		}
 		else
 		{
-		segments.push_back(new LLNormalTextSegment(sp, segment_start, segment_end, *this ));
+			createTextWithEmojiSegment(wide_text, segment_start, sp, segments);
 		}
 
 		insertStringNoUndo(getLength(), wide_text, &segments);
@@ -3514,6 +3544,19 @@ const S32 LLLabelTextSegment::getLength() const
 	return mEditor.getWlabel().length();
 }
 
+//
+// LLEmojiTextSegment
+//
+LLEmojiTextSegment::LLEmojiTextSegment(LLStyleConstSP style, S32 start, S32 end, LLTextBase& editor)
+	: LLNormalTextSegment(style, start, end, editor)
+{
+}
+
+LLEmojiTextSegment::LLEmojiTextSegment(const LLColor4& color, S32 start, S32 end, LLTextBase& editor, BOOL is_visible)
+	: LLNormalTextSegment(color, start, end, editor, is_visible)
+{
+}
+
 //
 // LLOnHoverChangeableTextSegment
 //
diff --git a/indra/llui/lltextbase.h b/indra/llui/lltextbase.h
index 590e7c9dbb..fc999c4cca 100644
--- a/indra/llui/lltextbase.h
+++ b/indra/llui/lltextbase.h
@@ -178,6 +178,17 @@ protected:
 	/*virtual*/	const S32			getLength()	const;
 };
 
+// Text segment that represents a single emoji character that has a different style (=font size) than the rest of
+// the document it belongs to
+class LLEmojiTextSegment : public LLNormalTextSegment
+{
+public:
+	LLEmojiTextSegment(LLStyleConstSP style, S32 start, S32 end, LLTextBase& editor);
+	LLEmojiTextSegment(const LLColor4& color, S32 start, S32 end, LLTextBase& editor, BOOL is_visible = TRUE);
+
+	bool canEdit() const override { return false; }
+};
+
 // Text segment that changes it's style depending of mouse pointer position ( is it inside or outside segment)
 class LLOnHoverChangeableTextSegment : public LLNormalTextSegment
 {
@@ -629,6 +640,7 @@ protected:
 	
 	void							appendTextImpl(const std::string &new_text, const LLStyle::Params& input_params = LLStyle::Params());
 	void							appendAndHighlightTextImpl(const std::string &new_text, S32 highlight_part, const LLStyle::Params& style_params, bool underline_on_hover_only = false);
+	void							createTextWithEmojiSegment(const LLWString& wide_text, S32 segment_start, LLStyleConstSP style, segment_vec_t& segments);
 	S32 normalizeUri(std::string& uri);
 	
 protected:
-- 
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