From 5a6ddb2ea666e895890d3cb690cce5101cf12652 Mon Sep 17 00:00:00 2001
From: Kitty Barnett <develop@catznip.com>
Date: Thu, 7 Nov 2019 17:15:21 +0100
Subject: Fallback fonts can have first crack at adding an unknown character +
 set Twemoji as the viewer's fallback for all emoji blocks

---
 indra/llcommon/CMakeLists.txt |  2 ++
 indra/llcommon/llstring.cpp   | 26 ++++++++++++++++++++++++++
 indra/llcommon/llstring.h     |  2 ++
 3 files changed, 30 insertions(+)

(limited to 'indra/llcommon')

diff --git a/indra/llcommon/CMakeLists.txt b/indra/llcommon/CMakeLists.txt
index af41b9e460..ba87d93fec 100644
--- a/indra/llcommon/CMakeLists.txt
+++ b/indra/llcommon/CMakeLists.txt
@@ -4,6 +4,7 @@
 project(llcommon)
 
 include(00-Common)
+include(ICU4C)
 include(LLCommon)
 include(Linking)
 include(Boost)
@@ -288,6 +289,7 @@ target_link_libraries(
     ${APRUTIL_LIBRARIES}
     ${APR_LIBRARIES}
     ${EXPAT_LIBRARIES}
+    ${ICU4C_LIBRARY}
     ${JSONCPP_LIBRARIES}
     ${ZLIB_LIBRARIES}
     ${WINDOWS_LIBRARIES}
diff --git a/indra/llcommon/llstring.cpp b/indra/llcommon/llstring.cpp
index 0174c411b4..b272728200 100644
--- a/indra/llcommon/llstring.cpp
+++ b/indra/llcommon/llstring.cpp
@@ -30,6 +30,7 @@
 #include "llerror.h"
 #include "llfasttimer.h"
 #include "llsd.h"
+#include <unicode/uchar.h>
 #include <vector>
 
 #if LL_WINDOWS
@@ -888,6 +889,31 @@ std::string LLStringOps::sDayFormat;
 std::string LLStringOps::sAM;
 std::string LLStringOps::sPM;
 
+// static
+bool LLStringOps::isEmoji(llwchar wch)
+{
+	switch (ublock_getCode(wch))
+	{
+		case UBLOCK_MISCELLANEOUS_SYMBOLS:
+		case UBLOCK_DINGBATS:
+		case UBLOCK_MISCELLANEOUS_SYMBOLS_AND_PICTOGRAPHS:
+		case UBLOCK_EMOTICONS:
+		case UBLOCK_TRANSPORT_AND_MAP_SYMBOLS:
+#if U_ICU_VERSION_MAJOR_NUM > 56
+		// Boost uses ICU so we can't update it independently
+		case UBLOCK_SUPPLEMENTAL_SYMBOLS_AND_PICTOGRAPHS:
+#endif // U_ICU_VERSION_MAJOR_NUM > 56
+			return true;
+		default:
+#if U_ICU_VERSION_MAJOR_NUM > 56
+			return false;
+#else
+			// See https://en.wikipedia.org/wiki/Supplemental_Symbols_and_Pictographs
+			return wch >= 0x1F900 && wch <= 0x1F9FF;
+#endif // U_ICU_VERSION_MAJOR_NUM > 56
+	}
+}
+
 
 S32	LLStringOps::collate(const llwchar* a, const llwchar* b)
 { 
diff --git a/indra/llcommon/llstring.h b/indra/llcommon/llstring.h
index b619a9e48c..d31d0cafc7 100644
--- a/indra/llcommon/llstring.h
+++ b/indra/llcommon/llstring.h
@@ -193,6 +193,8 @@ public:
 	static bool isAlnum(char a) { return isalnum((unsigned char)a) != 0; }
 	static bool isAlnum(llwchar a) { return iswalnum(a) != 0; }
 
+	static bool isEmoji(llwchar wch);
+
 	static S32	collate(const char* a, const char* b) { return strcoll(a, b); }
 	static S32	collate(const llwchar* a, const llwchar* b);
 
-- 
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