Merge branch 'main' into marchcat/x-merge

# Conflicts:
#	indra/llcommon/llstring.cpp
#	indra/llcommon/llstring.h

12 files changed, 824 insertions, 294 deletions

diff --git a/indra/llrender/CMakeLists.txt b/indra/llrender/CMakeLists.txt
index a95daed6cd..7f881c8bb3 100644
--- a/indra/llrender/CMakeLists.txt
+++ b/indra/llrender/CMakeLists.txt
@@ -15,6 +15,7 @@ set(llrender_SOURCE_FILES
     llcubemaparray.cpp
     llfontbitmapcache.cpp
     llfontfreetype.cpp
+    llfontfreetypesvg.cpp
     llfontgl.cpp
     llfontregistry.cpp
     llgl.cpp
@@ -43,6 +44,7 @@ set(llrender_HEADER_FILES
     llcubemaparray.h
     llfontgl.h
     llfontfreetype.h
+    llfontfreetypesvg.h
     llfontbitmapcache.h
     llfontregistry.h
     llgl.h
diff --git a/indra/llrender/llfontbitmapcache.cpp b/indra/llrender/llfontbitmapcache.cpp
index c71e24c83a..42b0045cf3 100644
--- a/indra/llrender/llfontbitmapcache.cpp
+++ b/indra/llrender/llfontbitmapcache.cpp
@@ -30,14 +30,7 @@
 #include "llfontbitmapcache.h"
 
 LLFontBitmapCache::LLFontBitmapCache()
-:	mNumComponents(0),
-	mBitmapWidth(0),
-	mBitmapHeight(0),
-	mBitmapNum(-1),
-	mMaxCharWidth(0),
-	mMaxCharHeight(0),
-	mCurrentOffsetX(1),
-	mCurrentOffsetY(1)
+
 {
 }
 
@@ -45,121 +38,149 @@ LLFontBitmapCache::~LLFontBitmapCache()
 {
 }
 
-void LLFontBitmapCache::init(S32 num_components,
-							 S32 max_char_width,
+void LLFontBitmapCache::init(S32 max_char_width,
 							 S32 max_char_height)
 {
 	reset();
 	
-	mNumComponents = num_components;
 	mMaxCharWidth = max_char_width;
 	mMaxCharHeight = max_char_height;
+
+	S32 image_width = mMaxCharWidth * 20;
+	S32 pow_iw = 2;
+	while (pow_iw < image_width)
+	{
+		pow_iw <<= 1;
+	}
+	image_width = pow_iw;
+	image_width = llmin(512, image_width); // Don't make bigger than 512x512, ever.
+
+	mBitmapWidth = image_width;
+	mBitmapHeight = image_width;
 }
 
-LLImageRaw *LLFontBitmapCache::getImageRaw(U32 bitmap_num) const
+LLImageRaw *LLFontBitmapCache::getImageRaw(EFontGlyphType bitmap_type, U32 bitmap_num) const
 {
-	if (bitmap_num >= mImageRawVec.size())
-		return NULL;
+	const U32 bitmap_idx = static_cast<U32>(bitmap_type);
+	if (bitmap_type >= EFontGlyphType::Count || bitmap_num >= mImageRawVec[bitmap_idx].size())
+		return nullptr;
 
-	return mImageRawVec[bitmap_num];
+	return mImageRawVec[bitmap_idx][bitmap_num];
 }
 
-LLImageGL *LLFontBitmapCache::getImageGL(U32 bitmap_num) const
+LLImageGL *LLFontBitmapCache::getImageGL(EFontGlyphType bitmap_type, U32 bitmap_num) const
 {
-	if (bitmap_num >= mImageGLVec.size())
-		return NULL;
+	const U32 bitmap_idx = static_cast<U32>(bitmap_type);
+	if (bitmap_type >= EFontGlyphType::Count || bitmap_num >= mImageGLVec[bitmap_idx].size())
+		return nullptr;
 
-	return mImageGLVec[bitmap_num];
+	return mImageGLVec[bitmap_idx][bitmap_num];
 }
 
 
-BOOL LLFontBitmapCache::nextOpenPos(S32 width, S32 &pos_x, S32 &pos_y, S32& bitmap_num)
+BOOL LLFontBitmapCache::nextOpenPos(S32 width, S32& pos_x, S32& pos_y, EFontGlyphType bitmap_type, U32& bitmap_num)
 {
-	if ((mBitmapNum<0) || (mCurrentOffsetX + width + 1) > mBitmapWidth)
+	if (bitmap_type >= EFontGlyphType::Count)
+	{
+		return FALSE;
+	}
+
+	const U32 bitmap_idx = static_cast<U32>(bitmap_type);
+	if (mImageRawVec[bitmap_idx].empty() || (mCurrentOffsetX[bitmap_idx] + width + 1) > mBitmapWidth)
 	{
-		if ((mBitmapNum<0) || (mCurrentOffsetY + 2*mMaxCharHeight + 2) > mBitmapHeight)
+		if ((mImageRawVec[bitmap_idx].empty()) || (mCurrentOffsetY[bitmap_idx] + 2*mMaxCharHeight + 2) > mBitmapHeight)
 		{
 			// We're out of space in the current image, or no image
 			// has been allocated yet.  Make a new one.
-			
-			mImageRawVec.push_back(new LLImageRaw);
-			mBitmapNum = mImageRawVec.size()-1;
-			LLImageRaw *image_raw = getImageRaw(mBitmapNum);
-
-			// Make corresponding GL image.
-			mImageGLVec.push_back(new LLImageGL(FALSE));
-			LLImageGL *image_gl = getImageGL(mBitmapNum);
-			
-			S32 image_width = mMaxCharWidth * 20;
-			S32 pow_iw = 2;
-			while (pow_iw < image_width)
+            
+            S32 image_width = mMaxCharWidth * 20;
+            S32 pow_iw = 2;
+            while (pow_iw < image_width)
+            {
+                pow_iw *= 2;
+            }
+            image_width = pow_iw;
+            image_width = llmin(512, image_width); // Don't make bigger than 512x512, ever.
+            S32 image_height = image_width;
+            
+            mBitmapWidth = image_width;
+            mBitmapHeight = image_height;
+            
+			S32 num_components = getNumComponents(bitmap_type);
+			mImageRawVec[bitmap_idx].push_back(new LLImageRaw(mBitmapWidth, mBitmapHeight, num_components));
+			bitmap_num = mImageRawVec[bitmap_idx].size() - 1;
+
+			LLImageRaw* image_raw = getImageRaw(bitmap_type, bitmap_num);
+			if (EFontGlyphType::Grayscale == bitmap_type)
 			{
-				pow_iw *= 2;
+				image_raw->clear(255, 0);
 			}
-			image_width = pow_iw;
-			image_width = llmin(512, image_width); // Don't make bigger than 512x512, ever.
-			S32 image_height = image_width;
-
-			image_raw->resize(image_width, image_height, mNumComponents);
-
-			mBitmapWidth = image_width;
-			mBitmapHeight = image_height;
 
-			switch (mNumComponents)
-			{
-				case 1:
-					image_raw->clear();
-				break;
-				case 2:
-					image_raw->clear(255, 0);
-				break;
-			}
+			// Make corresponding GL image.
+			mImageGLVec[bitmap_idx].push_back(new LLImageGL(image_raw, false));
+			LLImageGL* image_gl = getImageGL(bitmap_type, bitmap_num);
 
 			// Start at beginning of the new image.
-			mCurrentOffsetX = 1;
-			mCurrentOffsetY = 1;
+			mCurrentOffsetX[bitmap_idx] = 1;
+			mCurrentOffsetY[bitmap_idx] = 1;
 
-			// Attach corresponding GL texture.
-			image_gl->createGLTexture(0, image_raw);
+			// Attach corresponding GL texture. (*TODO: is this needed?)
 			gGL.getTexUnit(0)->bind(image_gl);
 			image_gl->setFilteringOption(LLTexUnit::TFO_POINT); // was setMipFilterNearest(TRUE, TRUE);
 		}
 		else
 		{
 			// Move to next row in current image.
-			mCurrentOffsetX = 1;
-			mCurrentOffsetY += mMaxCharHeight + 1;
+			mCurrentOffsetX[bitmap_idx] = 1;
+			mCurrentOffsetY[bitmap_idx] += mMaxCharHeight + 1;
 		}
 	}
 
-	pos_x = mCurrentOffsetX;
-	pos_y = mCurrentOffsetY;
-	bitmap_num = mBitmapNum;
+	pos_x = mCurrentOffsetX[bitmap_idx];
+	pos_y = mCurrentOffsetY[bitmap_idx];
+	bitmap_num = getNumBitmaps(bitmap_type) - 1;
 
-	mCurrentOffsetX += width + 1;
+	mCurrentOffsetX[bitmap_idx] += width + 1;
 
 	return TRUE;
 }
 
 void LLFontBitmapCache::destroyGL()
 {
-	for (std::vector<LLPointer<LLImageGL> >::iterator it = mImageGLVec.begin();
-		 it != mImageGLVec.end(); ++it)
+	for (U32 idx = 0, cnt = static_cast<U32>(EFontGlyphType::Count); idx < cnt; idx++)
 	{
-		(*it)->destroyGLTexture();
+		for (LLImageGL* image_gl : mImageGLVec[idx])
+		{
+			image_gl->destroyGLTexture();
+		}
 	}
 }
 
 void LLFontBitmapCache::reset()
 {
-	mImageRawVec.clear();
-
-	mImageGLVec.clear();
+	for (U32 idx = 0, cnt = static_cast<U32>(EFontGlyphType::Count); idx < cnt; idx++)
+	{
+		mImageRawVec[idx].clear();
+		mImageGLVec[idx].clear();
+		mCurrentOffsetX[idx] = 1;
+		mCurrentOffsetY[idx] = 1;
+	}
 	
 	mBitmapWidth = 0;
 	mBitmapHeight = 0;
-	mBitmapNum = -1;
-	mCurrentOffsetX = 1;
-	mCurrentOffsetY = 1;
 }
 
+//static
+U32 LLFontBitmapCache::getNumComponents(EFontGlyphType bitmap_type)
+{
+	switch (bitmap_type)
+	{
+		case EFontGlyphType::Grayscale:
+			return 2;
+		case EFontGlyphType::Color:
+			return 4;
+		default:
+			llassert(false);
+			return 2;
+	}
+}
diff --git a/indra/llrender/llfontbitmapcache.h b/indra/llrender/llfontbitmapcache.h
index 7de3a6b56f..c63281ab70 100644
--- a/indra/llrender/llfontbitmapcache.h
+++ b/indra/llrender/llfontbitmapcache.h
@@ -30,6 +30,14 @@
 #include <vector>
 #include "lltrace.h"
 
+enum class EFontGlyphType : U32
+{
+	Grayscale = 0,
+	Color,
+	Count,
+	Unspecified,
+};
+
 // Maintain a collection of bitmaps containing rendered glyphs.
 // Generalizes the single-bitmap logic from LLFontFreetype and LLFontGL.
 class LLFontBitmapCache
@@ -39,35 +47,35 @@ public:
 	~LLFontBitmapCache();
 
 	// Need to call this once, before caching any glyphs.
- 	void init(S32 num_components,
-			  S32 max_char_width,
+ 	void init(S32 max_char_width,
 			  S32 max_char_height);
 
 	void reset();
 
-	BOOL nextOpenPos(S32 width, S32 &posX, S32 &posY, S32 &bitmapNum);
+	BOOL nextOpenPos(S32 width, S32& posX, S32& posY, EFontGlyphType bitmapType, U32& bitmapNum);
 	
 	void destroyGL();
 	
- 	LLImageRaw *getImageRaw(U32 bitmapNum = 0) const;
- 	LLImageGL *getImageGL(U32 bitmapNum = 0) const;
-	
+ 	LLImageRaw* getImageRaw(EFontGlyphType bitmapType, U32 bitmapNum) const;
+ 	LLImageGL* getImageGL(EFontGlyphType bitmapType, U32 bitmapNum) const;
+
 	S32 getMaxCharWidth() const { return mMaxCharWidth; }
-	S32 getNumComponents() const { return mNumComponents; }
+	U32 getNumBitmaps(EFontGlyphType bitmapType) const { return (bitmapType < EFontGlyphType::Count) ? mImageRawVec[static_cast<U32>(bitmapType)].size() : 0; }
 	S32 getBitmapWidth() const { return mBitmapWidth; }
 	S32 getBitmapHeight() const { return mBitmapHeight; }
 
+protected:
+	static U32 getNumComponents(EFontGlyphType bitmap_type);
+
 private:
-	S32 mNumComponents;
-	S32 mBitmapWidth;
-	S32 mBitmapHeight;
-	S32 mBitmapNum;
-	S32 mMaxCharWidth;
-	S32 mMaxCharHeight;
-	S32 mCurrentOffsetX;
-	S32 mCurrentOffsetY;
-	std::vector<LLPointer<LLImageRaw> >	mImageRawVec;
-	std::vector<LLPointer<LLImageGL> > mImageGLVec;
+	S32 mBitmapWidth = 0;
+	S32 mBitmapHeight = 0;
+	S32 mCurrentOffsetX[static_cast<U32>(EFontGlyphType::Count)] = { 1 };
+	S32 mCurrentOffsetY[static_cast<U32>(EFontGlyphType::Count)] = { 1 };
+	S32 mMaxCharWidth = 0;
+	S32 mMaxCharHeight = 0;
+	std::vector<LLPointer<LLImageRaw>> mImageRawVec[static_cast<U32>(EFontGlyphType::Count)];
+	std::vector<LLPointer<LLImageGL>> mImageGLVec[static_cast<U32>(EFontGlyphType::Count)];
 };
 
 #endif //LL_LLFONTBITMAPCACHE_H
diff --git a/indra/llrender/llfontfreetype.cpp b/indra/llrender/llfontfreetype.cpp
index e964d1586f..d87fb5245c 100644
--- a/indra/llrender/llfontfreetype.cpp
+++ b/indra/llrender/llfontfreetype.cpp
@@ -34,14 +34,17 @@
 #ifdef LL_WINDOWS
 #include <freetype2\freetype\ftsystem.h>
 #endif
+#include "llfontfreetypesvg.h"
 
 // For some reason, this won't work if it's not wrapped in the ifdef
 #ifdef FT_FREETYPE_H
 #include FT_FREETYPE_H
 #endif
 
+#include "lldir.h"
 #include "llerror.h"
 #include "llimage.h"
+#include "llimagepng.h"
 //#include "llimagej2c.h"
 #include "llmath.h"	// Linden math
 #include "llstring.h"
@@ -49,6 +52,8 @@
 #include "llfontbitmapcache.h"
 #include "llgl.h"
 
+#define ENABLE_OT_SVG_SUPPORT
+
 FT_Render_Mode gFontRenderMode = FT_RENDER_MODE_NORMAL;
 
 LLFontManager *gFontManagerp = NULL;
@@ -81,6 +86,16 @@ LLFontManager::LLFontManager()
 		LL_ERRS() << "Freetype initialization failure!" << LL_ENDL;
 		FT_Done_FreeType(gFTLibrary);
 	}
+
+#ifdef ENABLE_OT_SVG_SUPPORT
+	SVG_RendererHooks hooks = {
+		LLFontFreeTypeSvgRenderer::OnInit,
+		LLFontFreeTypeSvgRenderer::OnFree,
+		LLFontFreeTypeSvgRenderer::OnRender,
+		LLFontFreeTypeSvgRenderer::OnPresetGlypthSlot,
+	};
+	FT_Property_Set(gFTLibrary, "ot-svg", "svg-hooks", &hooks);
+#endif
 }
 
 LLFontManager::~LLFontManager()
@@ -89,8 +104,9 @@ LLFontManager::~LLFontManager()
 }
 
 
-LLFontGlyphInfo::LLFontGlyphInfo(U32 index)
+LLFontGlyphInfo::LLFontGlyphInfo(U32 index, EFontGlyphType glyph_type)
 :	mGlyphIndex(index),
+	mGlyphType(glyph_type),
 	mWidth(0),			// In pixels
 	mHeight(0),			// In pixels
 	mXAdvance(0.f),		// In pixels
@@ -99,10 +115,25 @@ LLFontGlyphInfo::LLFontGlyphInfo(U32 index)
 	mYBitmapOffset(0), 	// Offset to the origin in the bitmap
 	mXBearing(0),		// Distance from baseline to left in pixels
 	mYBearing(0),		// Distance from baseline to top in pixels
-	mBitmapNum(0) // Which bitmap in the bitmap cache contains this glyph
+	mBitmapEntry(std::make_pair(EFontGlyphType::Unspecified, -1)) // Which bitmap in the bitmap cache contains this glyph
 {
 }
 
+LLFontGlyphInfo::LLFontGlyphInfo(const LLFontGlyphInfo& fgi)
+	: mGlyphIndex(fgi.mGlyphIndex)
+	, mGlyphType(fgi.mGlyphType)
+	, mWidth(fgi.mWidth)
+	, mHeight(fgi.mHeight)
+	, mXAdvance(fgi.mXAdvance)
+	, mYAdvance(fgi.mYAdvance)
+	, mXBitmapOffset(fgi.mXBitmapOffset)
+	, mYBitmapOffset(fgi.mYBitmapOffset)
+	, mXBearing(fgi.mXBearing)
+	, mYBearing(fgi.mYBearing)
+{
+	mBitmapEntry = fgi.mBitmapEntry;
+}
+
 LLFontFreetype::LLFontFreetype()
 :	mFontBitmapCachep(new LLFontBitmapCache),
 	mAscender(0.f),
@@ -156,7 +187,7 @@ void ft_close_cb(FT_Stream stream) {
 }
 #endif
 
-BOOL LLFontFreetype::loadFace(const std::string& filename, F32 point_size, F32 vert_dpi, F32 horz_dpi, S32 components, BOOL is_fallback, S32 face_n)
+BOOL LLFontFreetype::loadFace(const std::string& filename, F32 point_size, F32 vert_dpi, F32 horz_dpi, bool is_fallback, S32 face_n)
 {
 	// Don't leak face objects.  This is also needed to deal with
 	// changed font file names.
@@ -220,7 +251,7 @@ BOOL LLFontFreetype::loadFace(const std::string& filename, F32 point_size, F32 v
 	S32 max_char_width = ll_round(0.5f + (x_max - x_min));
 	S32 max_char_height = ll_round(0.5f + (y_max - y_min));
 
-	mFontBitmapCachep->init(components, max_char_width, max_char_height);
+	mFontBitmapCachep->init(max_char_width, max_char_height);
 
 	if (!mFTFace->charmap)
 	{
@@ -231,7 +262,7 @@ BOOL LLFontFreetype::loadFace(const std::string& filename, F32 point_size, F32 v
 	if (!mIsFallback)
 	{
 		// Add the default glyph
-		addGlyphFromFont(this, 0, 0);
+		addGlyphFromFont(this, 0, 0, EFontGlyphType::Grayscale);
 	}
 
 	mName = filename;
@@ -323,14 +354,11 @@ void LLFontFreetype::clearFontStreams()
 }
 #endif
 
-void LLFontFreetype::setFallbackFonts(const font_vector_t &font)
-{
-	mFallbackFonts = font;
-}
-
-const LLFontFreetype::font_vector_t &LLFontFreetype::getFallbackFonts() const
+void LLFontFreetype::addFallbackFont(const LLPointer<LLFontFreetype>& fallback_font, const char_functor_t& functor)
 {
-	return mFallbackFonts;
+	// Insert functor fallbacks before generic fallbacks
+	mFallbackFonts.insert((functor) ? std::find_if(mFallbackFonts.begin(), mFallbackFonts.end(), [](const fallback_font_t& fe) { return !fe.second; }) : mFallbackFonts.end(),
+	                      std::make_pair(fallback_font, functor));
 }
 
 F32 LLFontFreetype::getLineHeight() const
@@ -354,7 +382,7 @@ F32 LLFontFreetype::getXAdvance(llwchar wch) const
 		return 0.0;
 
 	// Return existing info only if it is current
-	LLFontGlyphInfo* gi = getGlyphInfo(wch);
+	LLFontGlyphInfo* gi = getGlyphInfo(wch, EFontGlyphType::Unspecified);
 	if (gi)
 	{
 		return gi->mXAdvance;
@@ -386,10 +414,10 @@ F32 LLFontFreetype::getXKerning(llwchar char_left, llwchar char_right) const
 		return 0.0;
 
 	//llassert(!mIsFallback);
-	LLFontGlyphInfo* left_glyph_info = getGlyphInfo(char_left);;
+	LLFontGlyphInfo* left_glyph_info = getGlyphInfo(char_left, EFontGlyphType::Unspecified);;
 	U32 left_glyph = left_glyph_info ? left_glyph_info->mGlyphIndex : 0;
 	// Kern this puppy.
-	LLFontGlyphInfo* right_glyph_info = getGlyphInfo(char_right);
+	LLFontGlyphInfo* right_glyph_info = getGlyphInfo(char_right, EFontGlyphType::Unspecified);
 	U32 right_glyph = right_glyph_info ? right_glyph_info->mGlyphIndex : 0;
 
 	FT_Vector  delta;
@@ -420,60 +448,94 @@ BOOL LLFontFreetype::hasGlyph(llwchar wch) const
 	return(mCharGlyphInfoMap.find(wch) != mCharGlyphInfoMap.end());
 }
 
-LLFontGlyphInfo* LLFontFreetype::addGlyph(llwchar wch) const
+LLFontGlyphInfo* LLFontFreetype::addGlyph(llwchar wch, EFontGlyphType glyph_type) const
 {
 	if (mFTFace == NULL)
 		return FALSE;
 
 	llassert(!mIsFallback);
+	llassert(glyph_type < EFontGlyphType::Count);
 	//LL_DEBUGS() << "Adding new glyph for " << wch << " to font" << LL_ENDL;
 
 	FT_UInt glyph_index;
 
+	// Fallback fonts with a functor have precedence over everything else
+	fallback_font_vector_t::const_iterator it_fallback = mFallbackFonts.cbegin();
+	/* This leads to a bug SL-19831 "Check marks in the menu are less visible."
+	** Also, LLFontRegistry::createFont() says: "Fallback fonts don't render"
+	for (; it_fallback != mFallbackFonts.cend() && it_fallback->second; ++it_fallback)
+	{
+		if (it_fallback->second(wch))
+		{
+			glyph_index = FT_Get_Char_Index(it_fallback->first->mFTFace, wch);
+			if (glyph_index)
+			{
+				return addGlyphFromFont(it_fallback->first, wch, glyph_index, glyph_type);
+			}
+		}
+	}
+	*/
+
 	// Initialize char to glyph map
 	glyph_index = FT_Get_Char_Index(mFTFace, wch);
 	if (glyph_index == 0)
 	{
 		//LL_INFOS() << "Trying to add glyph from fallback font!" << LL_ENDL;
-		font_vector_t::const_iterator iter;
-		for(iter = mFallbackFonts.begin(); iter != mFallbackFonts.end(); iter++)
+		for (; it_fallback != mFallbackFonts.cend(); ++it_fallback)
 		{
-			glyph_index = FT_Get_Char_Index((*iter)->mFTFace, wch);
+			glyph_index = FT_Get_Char_Index(it_fallback->first->mFTFace, wch);
 			if (glyph_index)
 			{
-				return addGlyphFromFont(*iter, wch, glyph_index);
+				return addGlyphFromFont(it_fallback->first, wch, glyph_index, glyph_type);
 			}
 		}
 	}
 	
-	char_glyph_info_map_t::iterator iter = mCharGlyphInfoMap.find(wch);
-	if (iter == mCharGlyphInfoMap.end())
+	std::pair<char_glyph_info_map_t::iterator, char_glyph_info_map_t::iterator> range_it = mCharGlyphInfoMap.equal_range(wch);
+	char_glyph_info_map_t::iterator iter = 
+		std::find_if(range_it.first, range_it.second, [&glyph_type](const char_glyph_info_map_t::value_type& entry) { return entry.second->mGlyphType == glyph_type; });
+	if (iter == range_it.second)
 	{
-		return addGlyphFromFont(this, wch, glyph_index);
+		return addGlyphFromFont(this, wch, glyph_index, glyph_type);
 	}
 	return NULL;
 }
 
-LLFontGlyphInfo* LLFontFreetype::addGlyphFromFont(const LLFontFreetype *fontp, llwchar wch, U32 glyph_index) const
+LLFontGlyphInfo* LLFontFreetype::addGlyphFromFont(const LLFontFreetype *fontp, llwchar wch, U32 glyph_index, EFontGlyphType requested_glyph_type) const
 {
     LL_PROFILE_ZONE_SCOPED;
 	if (mFTFace == NULL)
 		return NULL;
 
 	llassert(!mIsFallback);
-	fontp->renderGlyph(glyph_index);
+	fontp->renderGlyph(requested_glyph_type, glyph_index);
+
+	EFontGlyphType bitmap_glyph_type = EFontGlyphType::Unspecified;
+	switch (fontp->mFTFace->glyph->bitmap.pixel_mode)
+	{
+		case FT_PIXEL_MODE_MONO:
+		case FT_PIXEL_MODE_GRAY:
+			bitmap_glyph_type = EFontGlyphType::Grayscale;
+			break;
+		case FT_PIXEL_MODE_BGRA:
+			bitmap_glyph_type = EFontGlyphType::Color;
+			break;
+		default:
+			llassert_always(true);
+			break;
+	}
 	S32 width = fontp->mFTFace->glyph->bitmap.width;
 	S32 height = fontp->mFTFace->glyph->bitmap.rows;
 
 	S32 pos_x, pos_y;
-	S32 bitmap_num;
-	mFontBitmapCachep->nextOpenPos(width, pos_x, pos_y, bitmap_num);
+	U32 bitmap_num;
+	mFontBitmapCachep->nextOpenPos(width, pos_x, pos_y, bitmap_glyph_type, bitmap_num);
 	mAddGlyphCount++;
 
-	LLFontGlyphInfo* gi = new LLFontGlyphInfo(glyph_index);
+	LLFontGlyphInfo* gi = new LLFontGlyphInfo(glyph_index, requested_glyph_type);
 	gi->mXBitmapOffset = pos_x;
 	gi->mYBitmapOffset = pos_y;
-	gi->mBitmapNum = bitmap_num;
+	gi->mBitmapEntry = std::make_pair(bitmap_glyph_type, bitmap_num);
 	gi->mWidth = width;
 	gi->mHeight = height;
 	gi->mXBearing = fontp->mFTFace->glyph->bitmap_left;
@@ -484,8 +546,12 @@ LLFontGlyphInfo* LLFontFreetype::addGlyphFromFont(const LLFontFreetype *fontp, l
 
 	insertGlyphInfo(wch, gi);
 
-	llassert(fontp->mFTFace->glyph->bitmap.pixel_mode == FT_PIXEL_MODE_MONO
-	    || fontp->mFTFace->glyph->bitmap.pixel_mode == FT_PIXEL_MODE_GRAY);
+	if (requested_glyph_type != bitmap_glyph_type)
+	{
+		LLFontGlyphInfo* gi_temp = new LLFontGlyphInfo(*gi);
+		gi_temp->mGlyphType = bitmap_glyph_type;
+		insertGlyphInfo(wch, gi_temp);
+	}
 
 	if (fontp->mFTFace->glyph->bitmap.pixel_mode == FT_PIXEL_MODE_MONO
 	    || fontp->mFTFace->glyph->bitmap.pixel_mode == FT_PIXEL_MODE_GRAY)
@@ -520,78 +586,95 @@ LLFontGlyphInfo* LLFontFreetype::addGlyphFromFont(const LLFontFreetype *fontp, l
 			buffer_row_stride = width;
 		}
 
-		switch (mFontBitmapCachep->getNumComponents())
-		{
-		case 1:
-			mFontBitmapCachep->getImageRaw(bitmap_num)->setSubImage(pos_x,
-																	pos_y,
-																	width,
-																	height,
-																	buffer_data,
-																	buffer_row_stride,
-																	TRUE);
-			break;
-		case 2:
-			setSubImageLuminanceAlpha(pos_x,	
-									  pos_y,
-									  bitmap_num,
-									  width,
-									  height,
-									  buffer_data,
-									  buffer_row_stride);
-			break;
-		default:
-			break;
-		}
+		setSubImageLuminanceAlpha(pos_x,
+									pos_y,
+									bitmap_num,
+									width,
+									height,
+									buffer_data,
+									buffer_row_stride);
 
 		if (tmp_graydata)
 			delete[] tmp_graydata;
+	}
+	else if (fontp->mFTFace->glyph->bitmap.pixel_mode == FT_PIXEL_MODE_BGRA)
+	{
+		setSubImageBGRA(pos_x,
+		                pos_y,
+		                bitmap_num,
+		                fontp->mFTFace->glyph->bitmap.width,
+		                fontp->mFTFace->glyph->bitmap.rows,
+		                fontp->mFTFace->glyph->bitmap.buffer,
+		                llabs(fontp->mFTFace->glyph->bitmap.pitch));
 	} else {
-		// we don't know how to handle this pixel format from FreeType;
-		// omit it from the font-image.
+		llassert(false);
 	}
 	
-	LLImageGL *image_gl = mFontBitmapCachep->getImageGL(bitmap_num);
-	LLImageRaw *image_raw = mFontBitmapCachep->getImageRaw(bitmap_num);
+	LLImageGL *image_gl = mFontBitmapCachep->getImageGL(bitmap_glyph_type, bitmap_num);
+	LLImageRaw *image_raw = mFontBitmapCachep->getImageRaw(bitmap_glyph_type, bitmap_num);
 	image_gl->setSubImage(image_raw, 0, 0, image_gl->getWidth(), image_gl->getHeight());
 
 	return gi;
 }
 
-LLFontGlyphInfo* LLFontFreetype::getGlyphInfo(llwchar wch) const
+LLFontGlyphInfo* LLFontFreetype::getGlyphInfo(llwchar wch, EFontGlyphType glyph_type) const
 {
-	char_glyph_info_map_t::iterator iter = mCharGlyphInfoMap.find(wch);
-	if (iter != mCharGlyphInfoMap.end())
+	std::pair<char_glyph_info_map_t::iterator, char_glyph_info_map_t::iterator> range_it = mCharGlyphInfoMap.equal_range(wch);
+
+	char_glyph_info_map_t::iterator iter = (EFontGlyphType::Unspecified != glyph_type)
+		? std::find_if(range_it.first, range_it.second, [&glyph_type](const char_glyph_info_map_t::value_type& entry) { return entry.second->mGlyphType == glyph_type; })
+		: range_it.first;
+	if (iter != range_it.second)
 	{
 		return iter->second;
 	}
 	else
 	{
 		// this glyph doesn't yet exist, so render it and return the result
-		return addGlyph(wch);
+		return addGlyph(wch, (EFontGlyphType::Unspecified != glyph_type) ? glyph_type : EFontGlyphType::Grayscale);
 	}
 }
 
 void LLFontFreetype::insertGlyphInfo(llwchar wch, LLFontGlyphInfo* gi) const
 {
-	char_glyph_info_map_t::iterator iter = mCharGlyphInfoMap.find(wch);
-	if (iter != mCharGlyphInfoMap.end())
+	llassert(gi->mGlyphType < EFontGlyphType::Count);
+	std::pair<char_glyph_info_map_t::iterator, char_glyph_info_map_t::iterator> range_it = mCharGlyphInfoMap.equal_range(wch);
+
+	char_glyph_info_map_t::iterator iter =
+		std::find_if(range_it.first, range_it.second, [&gi](const char_glyph_info_map_t::value_type& entry) { return entry.second->mGlyphType == gi->mGlyphType; });
+	if (iter != range_it.second)
 	{
 		delete iter->second;
 		iter->second = gi;
 	}
 	else
 	{
-		mCharGlyphInfoMap[wch] = gi;
+		mCharGlyphInfoMap.insert(std::make_pair(wch, gi));
 	}
 }
 
-void LLFontFreetype::renderGlyph(U32 glyph_index) const
+void LLFontFreetype::renderGlyph(EFontGlyphType bitmap_type, U32 glyph_index) const
 {
 	if (mFTFace == NULL)
 		return;
 
-	llassert_always(! FT_Load_Glyph(mFTFace, glyph_index, FT_LOAD_FORCE_AUTOHINT) );
+	FT_Int32 load_flags = FT_LOAD_FORCE_AUTOHINT;
+	if (EFontGlyphType::Color == bitmap_type)
+	{
+		// We may not actually get a color render so our caller should always examine mFTFace->glyph->bitmap.pixel_mode
+		load_flags |= FT_LOAD_COLOR;
+	}
+
+	FT_Error error = FT_Load_Glyph(mFTFace, glyph_index, load_flags);
+	if (FT_Err_Ok != error)
+	{
+		std::string message = llformat(
+			"Error %d (%s) loading glyph %u: bitmap_type=%u, load_flags=%d",
+			error, FT_Error_String(error), glyph_index, bitmap_type, load_flags);
+		LL_WARNS_ONCE() << message << LL_ENDL;
+		error = FT_Load_Glyph(mFTFace, glyph_index, load_flags ^ FT_LOAD_COLOR);
+		llassert_always_msg(FT_Err_Ok == error, message.c_str());
+	}
 
 	llassert_always(! FT_Render_Glyph(mFTFace->glyph, gFontRenderMode) );
 
@@ -601,7 +684,7 @@ void LLFontFreetype::renderGlyph(U32 glyph_index) const
 void LLFontFreetype::reset(F32 vert_dpi, F32 horz_dpi)
 {
 	resetBitmapCache(); 
-	loadFace(mName, mPointSize, vert_dpi ,horz_dpi, mFontBitmapCachep->getNumComponents(), mIsFallback);
+	loadFace(mName, mPointSize, vert_dpi ,horz_dpi, mIsFallback, 0);
 	if (!mIsFallback)
 	{
 		// This is the head of the list - need to rebuild ourself and all fallbacks.
@@ -611,11 +694,9 @@ void LLFontFreetype::reset(F32 vert_dpi, F32 horz_dpi)
 		}
 		else
 		{
-			for(font_vector_t::iterator it = mFallbackFonts.begin();
-				it != mFallbackFonts.end();
-				++it)
+			for (fallback_font_vector_t::iterator it = mFallbackFonts.begin(); it != mFallbackFonts.end(); ++it)
 			{
-				(*it)->reset(vert_dpi, horz_dpi);
+				it->first->reset(vert_dpi, horz_dpi);
 			}
 		}
 	}
@@ -637,7 +718,7 @@ void LLFontFreetype::resetBitmapCache()
 	if(!mIsFallback)
 	{
 		// Add the empty glyph
-		addGlyphFromFont(this, 0, 0);
+		addGlyphFromFont(this, 0, 0, EFontGlyphType::Grayscale);
 	}
 }
 
@@ -651,6 +732,34 @@ const std::string &LLFontFreetype::getName() const
 	return mName;
 }
 
+static void dumpFontBitmap(const LLImageRaw* image_raw, const std::string& file_name)
+{
+	LLPointer<LLImagePNG> tmpImage = new LLImagePNG();
+	if ( (tmpImage->encode(image_raw, 0.0f)) && (tmpImage->save(gDirUtilp->getExpandedFilename(LL_PATH_LOGS, file_name))) )
+	{
+		LL_INFOS("Font") << "Successfully saved " << file_name << LL_ENDL;
+	}
+	else
+	{
+		LL_WARNS("Font") << "Failed to save " << file_name << LL_ENDL;
+	}
+}
+
+void LLFontFreetype::dumpFontBitmaps() const
+{
+	// Dump all the regular bitmaps (if any)
+	for (int idx = 0, cnt = mFontBitmapCachep->getNumBitmaps(EFontGlyphType::Grayscale); idx < cnt; idx++)
+	{
+		dumpFontBitmap(mFontBitmapCachep->getImageRaw(EFontGlyphType::Grayscale, idx), llformat("%s_%d_%d_%d.png", mFTFace->family_name, (int)(mPointSize * 10), mStyle, idx));
+	}
+
+	// Dump all the color bitmaps (if any)
+	for (int idx = 0, cnt = mFontBitmapCachep->getNumBitmaps(EFontGlyphType::Color); idx < cnt; idx++)
+	{
+		dumpFontBitmap(mFontBitmapCachep->getImageRaw(EFontGlyphType::Color, idx), llformat("%s_%d_%d_%d_clr.png", mFTFace->family_name, (int)(mPointSize * 10), mStyle, idx));
+	}
+}
+
 const LLFontBitmapCache* LLFontFreetype::getFontBitmapCache() const
 {
 	return mFontBitmapCachep;
@@ -666,17 +775,46 @@ U8 LLFontFreetype::getStyle() const
 	return mStyle;
 }
 
+bool LLFontFreetype::setSubImageBGRA(U32 x, U32 y, U32 bitmap_num, U16 width, U16 height, const U8* data, U32 stride) const
+{
+	LLImageRaw* image_raw = mFontBitmapCachep->getImageRaw(EFontGlyphType::Color, bitmap_num);
+	llassert(!mIsFallback);
+	llassert(image_raw && (image_raw->getComponents() == 4));
+
+	// NOTE: inspired by LLImageRaw::setSubImage()
+	U32* image_data = (U32*)image_raw->getData();
+	if (!image_data)
+	{
+		return false;
+	}
+
+	for (U32 idxRow = 0; idxRow < height; idxRow++)
+	{
+		const U32 nSrcRow = height - 1 - idxRow;
+		const U32 nSrcOffset = nSrcRow * width * image_raw->getComponents();
+		const U32 nDstOffset = (y + idxRow) * image_raw->getWidth() + x;
+
+		for (U32 idxCol = 0; idxCol < width; idxCol++)
+		{
+			U32 nTemp = nSrcOffset + idxCol * 4;
+			image_data[nDstOffset + idxCol] = data[nTemp + 3] << 24 | data[nTemp] << 16 | data[nTemp + 1] << 8 | data[nTemp + 2];
+		}
+	}
+
+	return true;
+}
+
 void LLFontFreetype::setSubImageLuminanceAlpha(U32 x, U32 y, U32 bitmap_num, U32 width, U32 height, U8 *data, S32 stride) const
 {
-	LLImageRaw *image_raw = mFontBitmapCachep->getImageRaw(bitmap_num);
+	LLImageRaw *image_raw = mFontBitmapCachep->getImageRaw(EFontGlyphType::Grayscale, bitmap_num);
 
 	llassert(!mIsFallback);
 	llassert(image_raw && (image_raw->getComponents() == 2));
-
 	
 	U8 *target = image_raw->getData();
+    llassert(target);
 
-	if (!data)
+	if (!data || !target)
 	{
 		return;
 	}
diff --git a/indra/llrender/llfontfreetype.h b/indra/llrender/llfontfreetype.h
index f61f169987..b036d337ba 100644
--- a/indra/llrender/llfontfreetype.h
+++ b/indra/llrender/llfontfreetype.h
@@ -56,9 +56,11 @@ private:
 
 struct LLFontGlyphInfo
 {
-	LLFontGlyphInfo(U32 index);
+	LLFontGlyphInfo(U32 index, EFontGlyphType glyph_type);
+	LLFontGlyphInfo(const LLFontGlyphInfo& fgi);
 
 	U32 mGlyphIndex;
+	EFontGlyphType mGlyphType;
 
 	// Metrics
 	S32 mWidth;			// In pixels
@@ -71,7 +73,7 @@ struct LLFontGlyphInfo
 	S32 mYBitmapOffset; // Offset to the origin in the bitmap
 	S32 mXBearing;	// Distance from baseline to left in pixels
 	S32 mYBearing;	// Distance from baseline to top in pixels
-	S32 mBitmapNum; // Which bitmap in the bitmap cache contains this glyph
+	std::pair<EFontGlyphType, S32> mBitmapEntry; // Which bitmap in the bitmap cache contains this glyph
 };
 
 extern LLFontManager *gFontManagerp;
@@ -84,7 +86,7 @@ public:
 
 	// is_fallback should be true for fallback fonts that aren't used
 	// to render directly (Unicode backup, primarily)
-	BOOL loadFace(const std::string& filename, F32 point_size, F32 vert_dpi, F32 horz_dpi, S32 components, BOOL is_fallback, S32 face_n = 0);
+	BOOL loadFace(const std::string& filename, F32 point_size, F32 vert_dpi, F32 horz_dpi, bool is_fallback, S32 face_n);
 
 	S32 getNumFaces(const std::string& filename);
 
@@ -93,10 +95,8 @@ public:
 	void clearFontStreams();
 #endif
 
-	typedef std::vector<LLPointer<LLFontFreetype> > font_vector_t;
-
-	void setFallbackFonts(const font_vector_t &font);
-	const font_vector_t &getFallbackFonts() const;
+	typedef std::function<bool(llwchar)> char_functor_t;
+	void addFallbackFont(const LLPointer<LLFontFreetype>& fallback_font, const char_functor_t& functor = nullptr);
 
 	// Global font metrics - in units of pixels
 	F32 getLineHeight() const;
@@ -135,7 +135,7 @@ public:
 	F32 getXKerning(llwchar char_left, llwchar char_right) const; // Get the kerning between the two characters
 	F32 getXKerning(const LLFontGlyphInfo* left_glyph_info, const LLFontGlyphInfo* right_glyph_info) const; // Get the kerning between the two characters
 
-	LLFontGlyphInfo* getGlyphInfo(llwchar wch) const;
+	LLFontGlyphInfo* getGlyphInfo(llwchar wch, EFontGlyphType glyph_type) const;
 
 	void reset(F32 vert_dpi, F32 horz_dpi);
 
@@ -143,6 +143,7 @@ public:
 
 	const std::string& getName() const;
 
+	void       dumpFontBitmaps() const;
 	const LLFontBitmapCache* getFontBitmapCache() const;
 
 	void setStyle(U8 style);
@@ -151,10 +152,11 @@ public:
 private:
 	void resetBitmapCache();
 	void setSubImageLuminanceAlpha(U32 x, U32 y, U32 bitmap_num, U32 width, U32 height, U8 *data, S32 stride = 0) const;
+	bool setSubImageBGRA(U32 x, U32 y, U32 bitmap_num, U16 width, U16 height, const U8* data, U32 stride) const;
 	BOOL hasGlyph(llwchar wch) const;		// Has a glyph for this character
-	LLFontGlyphInfo* addGlyph(llwchar wch) const;		// Add a new character to the font if necessary
-	LLFontGlyphInfo* addGlyphFromFont(const LLFontFreetype *fontp, llwchar wch, U32 glyph_index) const;	// Add a glyph from this font to the other (returns the glyph_index, 0 if not found)
-	void renderGlyph(U32 glyph_index) const;
+	LLFontGlyphInfo* addGlyph(llwchar wch, EFontGlyphType glyph_type) const;		// Add a new character to the font if necessary
+	LLFontGlyphInfo* addGlyphFromFont(const LLFontFreetype *fontp, llwchar wch, U32 glyph_index, EFontGlyphType bitmap_type) const;	// Add a glyph from this font to the other (returns the glyph_index, 0 if not found)
+	void renderGlyph(EFontGlyphType bitmap_type, U32 glyph_index) const;
 	void insertGlyphInfo(llwchar wch, LLFontGlyphInfo* gi) const;
 
 	std::string mName;
@@ -174,9 +176,12 @@ private:
 #endif
 
 	BOOL mIsFallback;
-	font_vector_t mFallbackFonts; // A list of fallback fonts to look for glyphs in (for Unicode chars)
+	typedef std::pair<LLPointer<LLFontFreetype>, char_functor_t> fallback_font_t;
+	typedef std::vector<fallback_font_t> fallback_font_vector_t;
+	fallback_font_vector_t mFallbackFonts; // A list of fallback fonts to look for glyphs in (for Unicode chars)
 
-	typedef boost::unordered_map<llwchar, LLFontGlyphInfo*> char_glyph_info_map_t;
+	// *NOTE: the same glyph can be present with multiple representations (but the pointer is always unique)
+	typedef boost::unordered_multimap<llwchar, LLFontGlyphInfo*> char_glyph_info_map_t;
 	mutable char_glyph_info_map_t mCharGlyphInfoMap; // Information about glyph location in bitmap
 
 	mutable LLFontBitmapCache* mFontBitmapCachep;
diff --git a/indra/llrender/llfontfreetypesvg.cpp b/indra/llrender/llfontfreetypesvg.cpp
new file mode 100644
index 0000000000..19d327a4c9
--- /dev/null
+++ b/indra/llrender/llfontfreetypesvg.cpp
@@ -0,0 +1,205 @@
+/**
+ * @file llfontfreetypesvg.cpp
+ * @brief Freetype font library SVG glyph rendering
+ *
+ * $LicenseInfo:firstyear=2002&license=viewerlgpl$
+ * Second Life Viewer Source Code
+ * Copyright (C) 2010, Linden Research, Inc.
+ *
+ * This library is free software; you can redistribute it and/or
+ * modify it under the terms of the GNU Lesser General Public
+ * License as published by the Free Software Foundation;
+ * version 2.1 of the License only.
+ *
+ * This library is distributed in the hope that it will be useful,
+ * but WITHOUT ANY WARRANTY; without even the implied warranty of
+ * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the GNU
+ * Lesser General Public License for more details.
+ *
+ * You should have received a copy of the GNU Lesser General Public
+ * License along with this library; if not, write to the Free Software
+ * Foundation, Inc., 51 Franklin Street, Fifth Floor, Boston, MA  02110-1301  USA
+ *
+ * Linden Research, Inc., 945 Battery Street, San Francisco, CA  94111  USA
+ * $/LicenseInfo$
+ */
+
+#include "linden_common.h"
+
+#include "llfontfreetypesvg.h"
+
+#if LL_WINDOWS
+#pragma warning (push)
+#pragma warning (disable : 4702)
+#endif
+
+#define NANOSVG_IMPLEMENTATION
+#include <nanosvg/nanosvg.h>
+#define NANOSVGRAST_IMPLEMENTATION
+#include <nanosvg/nanosvgrast.h>
+
+#if LL_WINDOWS
+#pragma warning (pop)
+#endif
+
+struct LLSvgRenderData
+{
+	FT_UInt    GlyphIndex = 0;
+	FT_Error   Error = FT_Err_Ok; // FreeType currently (@2.12.1) ignores the error value returned by the preset glyph slot callback so we return it at render time
+	// (See https://github.com/freetype/freetype/blob/5faa1df8b93ebecf0f8fd5fe8fda7b9082eddced/src/base/ftobjs.c#L1170)
+	NSVGimage* pNSvgImage = nullptr;
+	float      Scale = 0.f;
+};
+
+// static
+FT_Error LLFontFreeTypeSvgRenderer::OnInit(FT_Pointer* state)
+{
+	// The SVG driver hook state is shared across all callback invocations; since our state is lightweight
+	// we store it in the glyph instead.
+	*state = nullptr;
+
+	return FT_Err_Ok;
+}
+
+// static
+void LLFontFreeTypeSvgRenderer::OnFree(FT_Pointer* state)
+{
+}
+
+// static
+void LLFontFreeTypeSvgRenderer::OnDataFinalizer(void* objectp)
+{
+	FT_GlyphSlot glyph_slot = static_cast<FT_GlyphSlot>(objectp);
+
+	LLSvgRenderData* pData = static_cast<LLSvgRenderData*>(glyph_slot->generic.data);
+	glyph_slot->generic.data = nullptr;
+	glyph_slot->generic.finalizer = nullptr;
+	delete(pData);
+}
+
+//static
+FT_Error LLFontFreeTypeSvgRenderer::OnPresetGlypthSlot(FT_GlyphSlot glyph_slot, FT_Bool cache, FT_Pointer*)
+{
+	FT_SVG_Document document = static_cast<FT_SVG_Document>(glyph_slot->other);
+
+	llassert(!glyph_slot->generic.data || !cache || glyph_slot->glyph_index == ((LLSvgRenderData*)glyph_slot->generic.data)->GlyphIndex);
+	if (!glyph_slot->generic.data)
+	{
+		glyph_slot->generic.data = new LLSvgRenderData();
+		glyph_slot->generic.finalizer = LLFontFreeTypeSvgRenderer::OnDataFinalizer;
+	}
+	LLSvgRenderData* datap = static_cast<LLSvgRenderData*>(glyph_slot->generic.data);
+	if (!cache)
+	{
+		datap->GlyphIndex = glyph_slot->glyph_index;
+		datap->Error = FT_Err_Ok;
+	}
+
+	// NOTE: nsvgParse modifies the input string so we need a temporary copy
+	llassert(!datap->pNSvgImage || cache);
+	if (!datap->pNSvgImage)
+	{
+		char* document_buffer = new char[document->svg_document_length + 1];
+		memcpy(document_buffer, document->svg_document, document->svg_document_length);
+		document_buffer[document->svg_document_length] = '\0';
+
+		datap->pNSvgImage = nsvgParse(document_buffer, "px", 0.);
+
+		delete[] document_buffer;
+	}
+
+	if (!datap->pNSvgImage)
+	{
+		datap->Error = FT_Err_Invalid_SVG_Document;
+		return FT_Err_Invalid_SVG_Document;
+	}
+
+	// We don't (currently) support transformations so test for an identity rotation matrix + zero translation
+	if (document->transform.xx != 1 << 16 || document->transform.yx != 0 ||
+		document->transform.xy != 0 || document->transform.yy != 1 << 16 ||
+		document->delta.x > 0 || document->delta.y > 0)
+	{
+		datap->Error = FT_Err_Unimplemented_Feature;
+		return FT_Err_Unimplemented_Feature;
+	}
+
+	float svg_width = datap->pNSvgImage->width;
+	float svg_height = datap->pNSvgImage->height;
+	if (svg_width == 0.f || svg_height == 0.f)
+	{
+		svg_width = document->units_per_EM;
+		svg_height = document->units_per_EM;
+	}
+
+	float svg_x_scale = (float)document->metrics.x_ppem / floorf(svg_width);
+	float svg_y_scale = (float)document->metrics.y_ppem / floorf(svg_height);
+	float svg_scale = llmin(svg_x_scale, svg_y_scale);
+	datap->Scale = svg_scale;
+
+	glyph_slot->bitmap.width = floorf(svg_width) * svg_scale;
+	glyph_slot->bitmap.rows = floorf(svg_height) * svg_scale;
+	glyph_slot->bitmap_left = (document->metrics.x_ppem - glyph_slot->bitmap.width) / 2;
+	glyph_slot->bitmap_top = glyph_slot->face->size->metrics.ascender / 64.f;
+	glyph_slot->bitmap.pitch = glyph_slot->bitmap.width * 4;
+	glyph_slot->bitmap.pixel_mode = FT_PIXEL_MODE_BGRA;
+
+	/* Copied as-is from fcft (MIT license) */
+
+	// Compute all the bearings and set them correctly. The outline is scaled already, we just need to use the bounding box.
+	float horiBearingX = 0.;
+	float horiBearingY = -glyph_slot->bitmap_top;
+
+	// XXX parentheses correct?
+	float vertBearingX = glyph_slot->metrics.horiBearingX / 64.0f - glyph_slot->metrics.horiAdvance / 64.0f / 2;
+	float vertBearingY = (glyph_slot->metrics.vertAdvance / 64.0f - glyph_slot->metrics.height / 64.0f) / 2;
+
+	// Do conversion in two steps to avoid 'bad function cast' warning
+	glyph_slot->metrics.width = glyph_slot->bitmap.width * 64;
+	glyph_slot->metrics.height = glyph_slot->bitmap.rows * 64;
+	glyph_slot->metrics.horiBearingX = horiBearingX * 64;
+	glyph_slot->metrics.horiBearingY = horiBearingY * 64;
+	glyph_slot->metrics.vertBearingX = vertBearingX * 64;
+	glyph_slot->metrics.vertBearingY = vertBearingY * 64;
+	if (glyph_slot->metrics.vertAdvance == 0)
+	{
+		glyph_slot->metrics.vertAdvance = glyph_slot->bitmap.rows * 1.2f * 64;
+	}
+
+	return FT_Err_Ok;
+}
+
+// static
+FT_Error LLFontFreeTypeSvgRenderer::OnRender(FT_GlyphSlot glyph_slot, FT_Pointer*)
+{
+	LLSvgRenderData* datap = static_cast<LLSvgRenderData*>(glyph_slot->generic.data);
+	llassert(FT_Err_Ok == datap->Error);
+	if (FT_Err_Ok != datap->Error)
+	{
+		return datap->Error;
+	}
+
+	// Render to glyph bitmap
+	NSVGrasterizer* nsvgRasterizer = nsvgCreateRasterizer();
+	nsvgRasterize(nsvgRasterizer, datap->pNSvgImage, 0, 0, datap->Scale, glyph_slot->bitmap.buffer, glyph_slot->bitmap.width, glyph_slot->bitmap.rows, glyph_slot->bitmap.pitch);
+	nsvgDeleteRasterizer(nsvgRasterizer);
+	nsvgDelete(datap->pNSvgImage);
+	datap->pNSvgImage = nullptr;
+
+	// Convert from RGBA to BGRA
+	U32* pixel_buffer = (U32*)glyph_slot->bitmap.buffer; U8* byte_buffer = glyph_slot->bitmap.buffer;
+	for (size_t y = 0, h = glyph_slot->bitmap.rows; y < h; y++)
+	{
+		for (size_t x = 0, w = glyph_slot->bitmap.pitch / 4; x < w; x++)
+		{
+			size_t pixel_idx = y * w + x;
+			size_t byte_idx = pixel_idx * 4;
+			U8 alpha = byte_buffer[byte_idx + 3];
+			// Store as ARGB (*TODO - do we still have to care about endianness?)
+			pixel_buffer[y * w + x] = alpha << 24 | (byte_buffer[byte_idx] * alpha / 0xFF) << 16 | (byte_buffer[byte_idx + 1] * alpha / 0xFF) << 8 | (byte_buffer[byte_idx + 2] * alpha / 0xFF);
+		}
+	}
+
+	glyph_slot->format = FT_GLYPH_FORMAT_BITMAP;
+	glyph_slot->bitmap.pixel_mode = FT_PIXEL_MODE_BGRA;
+	return FT_Err_Ok;
+}
diff --git a/indra/llrender/llfontfreetypesvg.h b/indra/llrender/llfontfreetypesvg.h
new file mode 100644
index 0000000000..b5f541991a
--- /dev/null
+++ b/indra/llrender/llfontfreetypesvg.h
@@ -0,0 +1,54 @@
+/**
+ * @file llfontfreetypesvg.h
+ * @brief Freetype font library SVG glyph rendering
+ *
+ * $LicenseInfo:firstyear=2002&license=viewerlgpl$
+ * Second Life Viewer Source Code
+ * Copyright (C) 2010, Linden Research, Inc.
+ *
+ * This library is free software; you can redistribute it and/or
+ * modify it under the terms of the GNU Lesser General Public
+ * License as published by the Free Software Foundation;
+ * version 2.1 of the License only.
+ *
+ * This library is distributed in the hope that it will be useful,
+ * but WITHOUT ANY WARRANTY; without even the implied warranty of
+ * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the GNU
+ * Lesser General Public License for more details.
+ *
+ * You should have received a copy of the GNU Lesser General Public
+ * License along with this library; if not, write to the Free Software
+ * Foundation, Inc., 51 Franklin Street, Fifth Floor, Boston, MA  02110-1301  USA
+ *
+ * Linden Research, Inc., 945 Battery Street, San Francisco, CA  94111  USA
+ * $/LicenseInfo$
+ */
+
+#pragma once
+
+#include <ft2build.h>
+#include FT_TYPES_H
+#include FT_MODULE_H
+#include FT_OTSVG_H
+
+ // See https://freetype.org/freetype2/docs/reference/ft2-svg_fonts.html
+class LLFontFreeTypeSvgRenderer
+{
+public:
+	// Called when the very first OT-SVG glyph is rendered (across the entire lifetime of our FT_Library object)
+	static FT_Error OnInit(FT_Pointer* state);
+
+	// Called when the ot-svg module is being freed (but only called if the init hook was called previously)
+	static void     OnFree(FT_Pointer* state);
+
+	// Called to preset the glyph slot, twice per glyph:
+	//   - when FT_Load_Glyph needs to preset the glyph slot (with cache == false)
+	//   - right before the svg module calls the render callback hook. (with cache == true)
+	static FT_Error OnPresetGlypthSlot(FT_GlyphSlot glyph_slot, FT_Bool cache, FT_Pointer* state);
+
+	// Called to render an OT-SVG glyph (right after the preset hook OnPresetGlypthSlot was called with cache set to TRUE)
+	static FT_Error OnRender(FT_GlyphSlot glyph_slot, FT_Pointer* state);
+
+	// Called to deallocate our per glyph slot data
+	static void OnDataFinalizer(void* objectp);
+};
diff --git a/indra/llrender/llfontgl.cpp b/indra/llrender/llfontgl.cpp
index 15fddbc99f..53661b6a63 100644
--- a/indra/llrender/llfontgl.cpp
+++ b/indra/llrender/llfontgl.cpp
@@ -89,14 +89,14 @@ void LLFontGL::destroyGL()
 	mFontFreetype->destroyGL();
 }
 
-BOOL LLFontGL::loadFace(const std::string& filename, F32 point_size, F32 vert_dpi, F32 horz_dpi, S32 components, BOOL is_fallback, S32 face_n)
+BOOL LLFontGL::loadFace(const std::string& filename, F32 point_size, const F32 vert_dpi, const F32 horz_dpi, bool is_fallback, S32 face_n)
 {
 	if(mFontFreetype == reinterpret_cast<LLFontFreetype*>(NULL))
 	{
 		mFontFreetype = new LLFontFreetype;
 	}
 
-	return mFontFreetype->loadFace(filename, point_size, vert_dpi, horz_dpi, components, is_fallback, face_n);
+	return mFontFreetype->loadFace(filename, point_size, vert_dpi, horz_dpi, is_fallback, face_n);
 }
 
 S32 LLFontGL::getNumFaces(const std::string& filename)
@@ -110,14 +110,14 @@ S32 LLFontGL::getNumFaces(const std::string& filename)
 }
 
 S32 LLFontGL::render(const LLWString &wstr, S32 begin_offset, const LLRect& rect, const LLColor4 &color, HAlign halign, VAlign valign, U8 style,
-    ShadowType shadow, S32 max_chars, F32* right_x, BOOL use_ellipses) const
+    ShadowType shadow, S32 max_chars, F32* right_x, BOOL use_ellipses, BOOL use_color) const
 {
     LLRectf rect_float(rect.mLeft, rect.mTop, rect.mRight, rect.mBottom);
-    return render(wstr, begin_offset, rect_float, color, halign, valign, style, shadow, max_chars, right_x, use_ellipses);
+    return render(wstr, begin_offset, rect_float, color, halign, valign, style, shadow, max_chars, right_x, use_ellipses, use_color);
 }
 
 S32 LLFontGL::render(const LLWString &wstr, S32 begin_offset, const LLRectf& rect, const LLColor4 &color, HAlign halign, VAlign valign, U8 style, 
-					 ShadowType shadow, S32 max_chars, F32* right_x, BOOL use_ellipses) const
+					 ShadowType shadow, S32 max_chars, F32* right_x, BOOL use_ellipses, BOOL use_color) const
 {
 	F32 x = rect.mLeft;
 	F32 y = 0.f;
@@ -138,12 +138,12 @@ S32 LLFontGL::render(const LLWString &wstr, S32 begin_offset, const LLRectf& rec
 		y = rect.mBottom;
 		break;
 	}
-	return render(wstr, begin_offset, x, y, color, halign, valign, style, shadow, max_chars, rect.getWidth(), right_x, use_ellipses);
+	return render(wstr, begin_offset, x, y, color, halign, valign, style, shadow, max_chars, rect.getWidth(), right_x, use_ellipses, use_color);
 }
 
 
 S32 LLFontGL::render(const LLWString &wstr, S32 begin_offset, F32 x, F32 y, const LLColor4 &color, HAlign halign, VAlign valign, U8 style, 
-					 ShadowType shadow, S32 max_chars, S32 max_pixels, F32* right_x, BOOL use_ellipses) const
+					 ShadowType shadow, S32 max_chars, S32 max_pixels, F32* right_x, BOOL use_ellipses, BOOL use_color) const
 {
     LL_PROFILE_ZONE_SCOPED_CATEGORY_UI;
 
@@ -193,7 +193,7 @@ S32 LLFontGL::render(const LLWString &wstr, S32 begin_offset, F32 x, F32 y, cons
 
 	if (-1 == max_chars)
 	{
-		length = (S32)wstr.length() - begin_offset;
+		max_chars = length = (S32)wstr.length() - begin_offset;
 	}
 	else
 	{
@@ -254,7 +254,6 @@ S32 LLFontGL::render(const LLWString &wstr, S32 begin_offset, F32 x, F32 y, cons
 
 	const S32 LAST_CHARACTER = LLFontFreetype::LAST_CHAR_FULL;
 
-
 	BOOL draw_ellipses = FALSE;
 	if (use_ellipses)
 	{
@@ -278,7 +277,7 @@ S32 LLFontGL::render(const LLWString &wstr, S32 begin_offset, F32 x, F32 y, cons
 
 	LLColor4U text_color(color);
 
-	S32 bitmap_num = -1;
+	std::pair<EFontGlyphType, S32> bitmap_entry = std::make_pair(EFontGlyphType::Grayscale, -1);
 	S32 glyph_count = 0;
 	for (i = begin_offset; i < begin_offset + length; i++)
 	{
@@ -288,7 +287,7 @@ S32 LLFontGL::render(const LLWString &wstr, S32 begin_offset, F32 x, F32 y, cons
 		next_glyph = NULL;
 		if(!fgi)
 		{
-			fgi = mFontFreetype->getGlyphInfo(wch);
+			fgi = mFontFreetype->getGlyphInfo(wch, (!use_color) ? EFontGlyphType::Grayscale : EFontGlyphType::Color);
 		}
 		if (!fgi)
 		{
@@ -296,8 +295,8 @@ S32 LLFontGL::render(const LLWString &wstr, S32 begin_offset, F32 x, F32 y, cons
 			break;
 		}
 		// Per-glyph bitmap texture.
-		S32 next_bitmap_num = fgi->mBitmapNum;
-		if (next_bitmap_num != bitmap_num)
+		std::pair<EFontGlyphType, S32> next_bitmap_entry = fgi->mBitmapEntry;
+		if (next_bitmap_entry != bitmap_entry)
 		{
 			// Actually draw the queued glyphs before switching their texture;
 			// otherwise the queued glyphs will be taken from wrong textures.
@@ -311,8 +310,8 @@ S32 LLFontGL::render(const LLWString &wstr, S32 begin_offset, F32 x, F32 y, cons
 				glyph_count = 0;
 			}
 
-			bitmap_num = next_bitmap_num;
-			LLImageGL *font_image = font_bitmap_cache->getImageGL(bitmap_num);
+			bitmap_entry = next_bitmap_entry;
+			LLImageGL* font_image = font_bitmap_cache->getImageGL(bitmap_entry.first, bitmap_entry.second);
 			gGL.getTexUnit(0)->bind(font_image);
 		}
 	
@@ -345,7 +344,7 @@ S32 LLFontGL::render(const LLWString &wstr, S32 begin_offset, F32 x, F32 y, cons
 			glyph_count = 0;
 		}
 
-		drawGlyph(glyph_count, vertices, uvs, colors, screen_rect, uv_rect, text_color, style_to_add, shadow, drop_shadow_strength);
+		drawGlyph(glyph_count, vertices, uvs, colors, screen_rect, uv_rect, (bitmap_entry.first == EFontGlyphType::Grayscale) ? text_color : LLColor4U::white, style_to_add, shadow, drop_shadow_strength);
 
 		chars_drawn++;
 		cur_x += fgi->mXAdvance;
@@ -355,7 +354,7 @@ S32 LLFontGL::render(const LLWString &wstr, S32 begin_offset, F32 x, F32 y, cons
 		if (next_char && (next_char < LAST_CHARACTER))
 		{
 			// Kern this puppy.
-			next_glyph = mFontFreetype->getGlyphInfo(next_char);
+			next_glyph = mFontFreetype->getGlyphInfo(next_char, (!use_color) ? EFontGlyphType::Grayscale : EFontGlyphType::Color);
 			cur_x += mFontFreetype->getXKerning(fgi, next_glyph);
 		}
 
@@ -409,7 +408,8 @@ S32 LLFontGL::render(const LLWString &wstr, S32 begin_offset, F32 x, F32 y, cons
 				shadow,
 				S32_MAX, max_pixels,
 				right_x,
-				FALSE); 
+				FALSE,
+				use_color); 
 		gGL.popUIMatrix();
 	}
 
@@ -420,22 +420,22 @@ S32 LLFontGL::render(const LLWString &wstr, S32 begin_offset, F32 x, F32 y, cons
 
 S32 LLFontGL::render(const LLWString &text, S32 begin_offset, F32 x, F32 y, const LLColor4 &color) const
 {
-	return render(text, begin_offset, x, y, color, LEFT, BASELINE, NORMAL, NO_SHADOW, S32_MAX, S32_MAX, NULL, FALSE);
+	return render(text, begin_offset, x, y, color, LEFT, BASELINE, NORMAL, NO_SHADOW);
 }
 
-S32 LLFontGL::renderUTF8(const std::string &text, S32 begin_offset, F32 x, F32 y, const LLColor4 &color, HAlign halign,  VAlign valign, U8 style, ShadowType shadow, S32 max_chars, S32 max_pixels,  F32* right_x, BOOL use_ellipses) const
+S32 LLFontGL::renderUTF8(const std::string &text, S32 begin_offset, F32 x, F32 y, const LLColor4 &color, HAlign halign, VAlign valign, U8 style, ShadowType shadow, S32 max_chars, S32 max_pixels, F32* right_x, BOOL use_ellipses, BOOL use_color) const
 {
-	return render(utf8str_to_wstring(text), begin_offset, x, y, color, halign, valign, style, shadow, max_chars, max_pixels, right_x, use_ellipses);
+	return render(utf8str_to_wstring(text), begin_offset, x, y, color, halign, valign, style, shadow, max_chars, max_pixels, right_x, use_ellipses, use_color);
 }
 
 S32 LLFontGL::renderUTF8(const std::string &text, S32 begin_offset, S32 x, S32 y, const LLColor4 &color) const
 {
-	return renderUTF8(text, begin_offset, (F32)x, (F32)y, color, LEFT, BASELINE, NORMAL, NO_SHADOW, S32_MAX, S32_MAX, NULL, FALSE);
+	return renderUTF8(text, begin_offset, (F32)x, (F32)y, color, LEFT, BASELINE, NORMAL, NO_SHADOW);
 }
 
 S32 LLFontGL::renderUTF8(const std::string &text, S32 begin_offset, S32 x, S32 y, const LLColor4 &color, HAlign halign, VAlign valign, U8 style, ShadowType shadow) const
 {
-	return renderUTF8(text, begin_offset, (F32)x, (F32)y, color, halign, valign, style, shadow, S32_MAX, S32_MAX, NULL, FALSE);
+	return renderUTF8(text, begin_offset, (F32)x, (F32)y, color, halign, valign, style, shadow);
 }
 
 // font metrics - override for LLFontFreetype that returns units of virtual pixels
@@ -488,7 +488,7 @@ F32 LLFontGL::getWidthF32(const llwchar* wchars) const
 	return getWidthF32(wchars, 0, S32_MAX);
 }
 
-F32 LLFontGL::getWidthF32(const std::string& utf8text, S32 begin_offset, S32 max_chars ) const
+F32 LLFontGL::getWidthF32(const std::string& utf8text, S32 begin_offset, S32 max_chars) const
 {
 	LLWString wtext = utf8str_to_wstring(utf8text);
 	return getWidthF32(wtext.c_str(), begin_offset, max_chars);
@@ -512,7 +512,7 @@ F32 LLFontGL::getWidthF32(const llwchar* wchars, S32 begin_offset, S32 max_chars
 		next_glyph = NULL;
 		if(!fgi)
 		{
-			fgi = mFontFreetype->getGlyphInfo(wch);
+			fgi = mFontFreetype->getGlyphInfo(wch, EFontGlyphType::Unspecified);
 		}
 
 		F32 advance = mFontFreetype->getXAdvance(fgi);
@@ -535,7 +535,7 @@ F32 LLFontGL::getWidthF32(const llwchar* wchars, S32 begin_offset, S32 max_chars
 			&& (next_char < LAST_CHARACTER))
 		{
 			// Kern this puppy.
-			next_glyph = mFontFreetype->getGlyphInfo(next_char);
+			next_glyph = mFontFreetype->getGlyphInfo(next_char, EFontGlyphType::Unspecified);
 			cur_x += mFontFreetype->getXKerning(fgi, next_glyph);
 		}
 		// Round after kerning.
@@ -556,7 +556,7 @@ void LLFontGL::generateASCIIglyphs()
     LL_PROFILE_ZONE_SCOPED_CATEGORY_UI
     for (U32 i = 32; (i < 127); i++)
     {
-        mFontFreetype->getGlyphInfo(i);
+        mFontFreetype->getGlyphInfo(i, EFontGlyphType::Grayscale);
     }
 }
 
@@ -630,7 +630,7 @@ S32 LLFontGL::maxDrawableChars(const llwchar* wchars, F32 max_pixels, S32 max_ch
 		next_glyph = NULL;
 		if(!fgi)
 		{
-			fgi = mFontFreetype->getGlyphInfo(wch);
+			fgi = mFontFreetype->getGlyphInfo(wch, EFontGlyphType::Unspecified);
 
 			if (NULL == fgi)
 			{
@@ -655,7 +655,7 @@ S32 LLFontGL::maxDrawableChars(const llwchar* wchars, F32 max_pixels, S32 max_ch
 		if (((i+1) < max_chars) && wchars[i+1])
 		{
 			// Kern this puppy.
-			next_glyph = mFontFreetype->getGlyphInfo(wchars[i+1]);
+			next_glyph = mFontFreetype->getGlyphInfo(wchars[i+1], EFontGlyphType::Unspecified);
 			cur_x += mFontFreetype->getXKerning(fgi, next_glyph);
 		}
 
@@ -702,7 +702,7 @@ S32	LLFontGL::firstDrawableChar(const llwchar* wchars, F32 max_pixels, S32 text_
 	{
 		llwchar wch = wchars[i];
 
-		const LLFontGlyphInfo* fgi= mFontFreetype->getGlyphInfo(wch);
+		const LLFontGlyphInfo* fgi= mFontFreetype->getGlyphInfo(wch, EFontGlyphType::Unspecified);
 
 		// last character uses character width, since the whole character needs to be visible
 		// other characters just use advance
@@ -777,7 +777,7 @@ S32 LLFontGL::charFromPixelOffset(const llwchar* wchars, S32 begin_offset, F32 t
 		next_glyph = NULL;
 		if(!glyph)
 		{
-			glyph = mFontFreetype->getGlyphInfo(wch);
+			glyph = mFontFreetype->getGlyphInfo(wch, EFontGlyphType::Unspecified);
 		}
 		
 		F32 char_width = mFontFreetype->getXAdvance(glyph);
@@ -807,7 +807,7 @@ S32 LLFontGL::charFromPixelOffset(const llwchar* wchars, S32 begin_offset, F32 t
 			&& (wchars[(pos + 1)]))
 		{
 			// Kern this puppy.
-			next_glyph = mFontFreetype->getGlyphInfo(wchars[pos + 1]);
+			next_glyph = mFontFreetype->getGlyphInfo(wchars[pos + 1], EFontGlyphType::Unspecified);
 			cur_x += mFontFreetype->getXKerning(glyph, next_glyph);
 		}
 
@@ -847,6 +847,26 @@ void LLFontGL::initClass(F32 screen_dpi, F32 x_scale, F32 y_scale, const std::st
 	LLFontGL::loadDefaultFonts();
 }
 
+void LLFontGL::dumpTextures()
+{
+	if (mFontFreetype.notNull())
+	{
+		mFontFreetype->dumpFontBitmaps();
+	}
+}
+
+// static
+void LLFontGL::dumpFonts()
+{
+	sFontRegistry->dump();
+}
+
+// static
+void LLFontGL::dumpFontTextures()
+{
+	sFontRegistry->dumpTextures();
+}
+
 // Force standard fonts to get generated up front.
 // This is primarily for error detection purposes.
 // Don't do this during initClass because it can be slow and we want to get
@@ -1010,6 +1030,20 @@ LLFontGL::VAlign LLFontGL::vAlignFromName(const std::string& name)
 }
 
 //static
+LLFontGL* LLFontGL::getFontEmoji()
+{
+	static LLFontGL* fontp = getFont(LLFontDescriptor("Emoji", "Large", 0));
+	return fontp;;
+}
+
+//static
+LLFontGL* LLFontGL::getFontEmojiHuge()
+{
+	static LLFontGL* fontp = getFont(LLFontDescriptor("Emoji", "Huge", 0));
+	return fontp;;
+}
+
+//static
 LLFontGL* LLFontGL::getFontMonospace()
 {
 	static LLFontGL* fontp = getFont(LLFontDescriptor("Monospace","Monospace",0));
diff --git a/indra/llrender/llfontgl.h b/indra/llrender/llfontgl.h
index 9bbf9ce0c4..f6ec416c8b 100644
--- a/indra/llrender/llfontgl.h
+++ b/indra/llrender/llfontgl.h
@@ -87,7 +87,7 @@ public:
 
 	void destroyGL();
 
-	BOOL loadFace(const std::string& filename, F32 point_size, const F32 vert_dpi, const F32 horz_dpi, const S32 components, BOOL is_fallback, S32 face_n = 0);
+	BOOL loadFace(const std::string& filename, F32 point_size, const F32 vert_dpi, const F32 horz_dpi, bool is_fallback, S32 face_n);
 
 	S32 getNumFaces(const std::string& filename);
 
@@ -98,7 +98,8 @@ public:
 				U8 style = NORMAL, ShadowType shadow = NO_SHADOW, 
 				S32 max_chars = S32_MAX,
 				F32* right_x=NULL, 
-				BOOL use_ellipses = FALSE) const;
+				BOOL use_ellipses = FALSE,
+				BOOL use_color = TRUE) const;
 
 	S32 render(const LLWString &text, S32 begin_offset, 
 				const LLRectf& rect, 
@@ -107,7 +108,8 @@ public:
 				U8 style = NORMAL, ShadowType shadow = NO_SHADOW, 
 				S32 max_chars = S32_MAX,
 				F32* right_x=NULL, 
-				BOOL use_ellipses = FALSE) const;
+				BOOL use_ellipses = FALSE,
+				BOOL use_color = TRUE) const;
 
 	S32 render(const LLWString &text, S32 begin_offset, 
 				F32 x, F32 y, 
@@ -116,12 +118,13 @@ public:
 				U8 style = NORMAL, ShadowType shadow = NO_SHADOW, 
 				S32 max_chars = S32_MAX, S32 max_pixels = S32_MAX, 
 				F32* right_x=NULL, 
-				BOOL use_ellipses = FALSE) const;
+				BOOL use_ellipses = FALSE,
+				BOOL use_color = TRUE) const;
 
 	S32 render(const LLWString &text, S32 begin_offset, F32 x, F32 y, const LLColor4 &color) const;
 
 	// renderUTF8 does a conversion, so is slower!
-	S32 renderUTF8(const std::string &text, S32 begin_offset, F32 x, F32 y, const LLColor4 &color, HAlign halign,  VAlign valign, U8 style, ShadowType shadow, S32 max_chars, S32 max_pixels,  F32* right_x, BOOL use_ellipses) const;
+	S32 renderUTF8(const std::string &text, S32 begin_offset, F32 x, F32 y, const LLColor4 &color, HAlign halign,  VAlign valign, U8 style, ShadowType shadow, S32 max_chars = S32_MAX, S32 max_pixels = S32_MAX,  F32* right_x = NULL, BOOL use_ellipses = FALSE, BOOL use_color = TRUE) const;
 	S32 renderUTF8(const std::string &text, S32 begin_offset, S32 x, S32 y, const LLColor4 &color) const;
 	S32 renderUTF8(const std::string &text, S32 begin_offset, S32 x, S32 y, const LLColor4 &color, HAlign halign, VAlign valign, U8 style = NORMAL, ShadowType shadow = NO_SHADOW) const;
 
@@ -132,12 +135,12 @@ public:
 
 	S32 getWidth(const std::string& utf8text) const;
 	S32 getWidth(const llwchar* wchars) const;
-	S32 getWidth(const std::string& utf8text, S32 offset, S32 max_chars ) const;
+	S32 getWidth(const std::string& utf8text, S32 offset, S32 max_chars) const;
 	S32 getWidth(const llwchar* wchars, S32 offset, S32 max_chars) const;
 
 	F32 getWidthF32(const std::string& utf8text) const;
 	F32 getWidthF32(const llwchar* wchars) const;
-	F32 getWidthF32(const std::string& text, S32 offset, S32 max_chars ) const;
+	F32 getWidthF32(const std::string& text, S32 offset, S32 max_chars) const;
 	F32 getWidthF32(const llwchar* wchars, S32 offset, S32 max_chars, bool no_padding = false) const;
 
 	// The following are called often, frequently with large buffers, so do not use a string interface
@@ -165,6 +168,10 @@ public:
 
 	static void initClass(F32 screen_dpi, F32 x_scale, F32 y_scale, const std::string& app_dir, bool create_gl_textures = true);
 
+	       void dumpTextures();
+	static void dumpFonts();
+	static void dumpFontTextures();
+
 	// Load sans-serif, sans-serif-small, etc.
 	// Slow, requires multiple seconds to load fonts.
 	static bool loadDefaultFonts();
@@ -187,6 +194,8 @@ public:
 
 	static void setFontDisplay(BOOL flag) { sDisplayFont = flag; }
 		
+	static LLFontGL* getFontEmoji();
+	static LLFontGL* getFontEmojiHuge();
 	static LLFontGL* getFontMonospace();
 	static LLFontGL* getFontSansSerifSmall();
     static LLFontGL* getFontSansSerifSmallBold();
diff --git a/indra/llrender/llfontregistry.cpp b/indra/llrender/llfontregistry.cpp
index 9750bd4fa1..d2c7e466e6 100644
--- a/indra/llrender/llfontregistry.cpp
+++ b/indra/llrender/llfontregistry.cpp
@@ -47,6 +47,10 @@ bool init_from_xml(LLFontRegistry* registry, LLXMLNodePtr node);
 const std::string MACOSX_FONT_PATH_LIBRARY = "/Library/Fonts/";
 const std::string MACOSX_FONT_SUPPLEMENTAL = "Supplemental/";
 
+LLFontDescriptor::char_functor_map_t LLFontDescriptor::mCharFunctors({
+	{ "is_emoji", LLStringOps::isEmoji }
+});
+
 LLFontDescriptor::LLFontDescriptor():
 	mStyle(0)
 {
@@ -55,22 +59,22 @@ LLFontDescriptor::LLFontDescriptor():
 LLFontDescriptor::LLFontDescriptor(const std::string& name,
 								   const std::string& size, 
 								   const U8 style,
-								   const string_vec_t& file_names):
+								   const font_file_info_vec_t& font_files):
 	mName(name),
 	mSize(size),
 	mStyle(style),
-	mFileNames(file_names)
+	mFontFiles(font_files)
 {
 }
 
 LLFontDescriptor::LLFontDescriptor(const std::string& name,
 	const std::string& size,
 	const U8 style,
-	const string_vec_t& file_names,
-	const string_vec_t& ft_collection_listections) :
-	LLFontDescriptor(name, size, style, file_names)
+	const font_file_info_vec_t& font_list,
+	const font_file_info_vec_t& font_collection_files) :
+	LLFontDescriptor(name, size, style, font_list)
 {
-	mFontCollectionsList = ft_collection_listections;
+	mFontCollectionFiles = font_collection_files;
 }
 
 LLFontDescriptor::LLFontDescriptor(const std::string& name,
@@ -82,7 +86,6 @@ LLFontDescriptor::LLFontDescriptor(const std::string& name,
 {
 }
 
-
 bool LLFontDescriptor::operator<(const LLFontDescriptor& b) const
 {
 	if (mName < b.mName)
@@ -175,7 +178,19 @@ LLFontDescriptor LLFontDescriptor::normalize() const
 	if (removeSubString(new_name,"Italic"))
 		new_style |= LLFontGL::ITALIC;
 
-	return LLFontDescriptor(new_name,new_size,new_style,getFileNames(),getFontCollectionsList());
+	return LLFontDescriptor(new_name,new_size,new_style, getFontFiles(), getFontCollectionFiles());
+}
+
+void LLFontDescriptor::addFontFile(const std::string& file_name, const std::string& char_functor)
+{
+	char_functor_map_t::const_iterator it = mCharFunctors.find(char_functor);
+	mFontFiles.push_back(LLFontFileInfo(file_name, (mCharFunctors.end() != it) ? it->second : nullptr));
+}
+
+void LLFontDescriptor::addFontCollectionFile(const std::string& file_name, const std::string& char_functor)
+{
+	char_functor_map_t::const_iterator it = mCharFunctors.find(char_functor);
+	mFontCollectionFiles.push_back(LLFontFileInfo(file_name, (mCharFunctors.end() != it) ? it->second : nullptr));
 }
 
 LLFontRegistry::LLFontRegistry(bool create_gl_textures)
@@ -273,17 +288,24 @@ bool font_desc_init_from_xml(LLXMLNodePtr node, LLFontDescriptor& desc)
 		if (child->hasName("file"))
 		{
 			std::string font_file_name = child->getTextContents();
-			desc.getFileNames().push_back(font_file_name);
-			
+			std::string char_functor;
+
+			if (child->hasAttribute("functor"))
+			{
+				child->getAttributeString("functor", char_functor);
+			}
+
 			if (child->hasAttribute("load_collection"))
 			{
 				BOOL col = FALSE;
 				child->getAttributeBOOL("load_collection", col);
 				if (col)
 				{
-					desc.getFontCollectionsList().push_back(font_file_name);
+					desc.addFontCollectionFile(font_file_name, char_functor);
 				}
 			}
+
+			desc.addFontFile(font_file_name, char_functor);
 		}
 		else if (child->hasName("os"))
 		{
@@ -326,19 +348,19 @@ bool init_from_xml(LLFontRegistry* registry, LLXMLNodePtr node)
 					// A little roundabout because the map key is const,
 					// so we have to fetch it, make a new map key, and
 					// replace the old entry.
-					string_vec_t match_file_names = match_desc->getFileNames();
-					match_file_names.insert(match_file_names.begin(),
-											desc.getFileNames().begin(),
-											desc.getFileNames().end());
+					font_file_info_vec_t font_files = match_desc->getFontFiles();
+					font_files.insert(font_files.begin(),
+									  desc.getFontFiles().begin(),
+									  desc.getFontFiles().end());
 
-					string_vec_t collections_list = match_desc->getFontCollectionsList();
-					collections_list.insert(collections_list.begin(),
-						desc.getFontCollectionsList().begin(),
-						desc.getFontCollectionsList().end());
+					font_file_info_vec_t font_collection_files = match_desc->getFontCollectionFiles();
+					font_collection_files.insert(font_collection_files.begin(),
+						desc.getFontCollectionFiles().begin(),
+						desc.getFontCollectionFiles().end());
 
 					LLFontDescriptor new_desc = *match_desc;
-					new_desc.getFileNames() = match_file_names;
-					new_desc.getFontCollectionsList() = collections_list;
+					new_desc.setFontFiles(font_files);
+					new_desc.setFontCollectionFiles(font_collection_files);
 					registry->mFontMap.erase(*match_desc);
 					registry->mFontMap[new_desc] = NULL;
 				}
@@ -423,82 +445,80 @@ LLFontGL *LLFontRegistry::createFont(const LLFontDescriptor& desc)
 
 	// Build list of font names to look for.
 	// Files specified for this font come first, followed by those from the default descriptor.
-	string_vec_t file_names = match_desc->getFileNames();
-	string_vec_t ft_collection_list = match_desc->getFontCollectionsList();
-	string_vec_t default_file_names;
+	font_file_info_vec_t font_files = match_desc->getFontFiles();
+	font_file_info_vec_t font_collection_files = match_desc->getFontCollectionFiles();
 	LLFontDescriptor default_desc("default",s_template_string,0);
 	const LLFontDescriptor *match_default_desc = getMatchingFontDesc(default_desc);
 	if (match_default_desc)
 	{
-		file_names.insert(file_names.end(),
-						  match_default_desc->getFileNames().begin(),
-						  match_default_desc->getFileNames().end());
-		ft_collection_list.insert(ft_collection_list.end(),
-			match_default_desc->getFontCollectionsList().begin(),
-			match_default_desc->getFontCollectionsList().end());
+		font_files.insert(font_files.end(),
+						  match_default_desc->getFontFiles().begin(),
+						  match_default_desc->getFontFiles().end());
+		font_collection_files.insert(font_collection_files.end(),
+			match_default_desc->getFontCollectionFiles().begin(),
+			match_default_desc->getFontCollectionFiles().end());
 	}
 
 	// Add ultimate fallback list - generated dynamically on linux,
 	// null elsewhere.
-	file_names.insert(file_names.end(),
-					  getUltimateFallbackList().begin(),
-					  getUltimateFallbackList().end());
+	std::transform(getUltimateFallbackList().begin(), getUltimateFallbackList().end(), std::back_inserter(font_files),
+	               [](const std::string& file_name) { return LLFontFileInfo(file_name); });
 
 	// Load fonts based on names.
-	if (file_names.empty())
+	if (font_files.empty())
 	{
 		LL_WARNS() << "createFont failed, no file names specified" << LL_ENDL;
 		return NULL;
 	}
 
-	LLFontFreetype::font_vector_t fontlist;
 	LLFontGL *result = NULL;
 
-	// Snarf all fonts we can into fontlist.  First will get pulled
-	// off the list and become the "head" font, set to non-fallback.
+	// The first font will get pulled will be the "head" font, set to non-fallback.
 	// Rest will consitute the fallback list.
 	BOOL is_first_found = TRUE;
 	
-	std::string local_path = LLFontGL::getFontPathLocal();
-	std::string sys_path = LLFontGL::getFontPathSystem();
-	
+	string_vec_t font_search_paths;
+	font_search_paths.push_back(LLFontGL::getFontPathLocal());
+	font_search_paths.push_back(LLFontGL::getFontPathSystem());
+#if LL_DARWIN
+	font_search_paths.push_back(MACOSX_FONT_PATH_LIBRARY);
+	font_search_paths.push_back(MACOSX_FONT_PATH_LIBRARY + MACOSX_FONT_SUPPLEMENTAL);
+	font_search_paths.push_back(LLFontGL::getFontPathSystem() + MACOSX_FONT_SUPPLEMENTAL);
+#endif
+
 	// The fontname string may contain multiple font file names separated by semicolons.
 	// Break it apart and try loading each one, in order.
-	for(string_vec_t::iterator file_name_it = file_names.begin();
-		file_name_it != file_names.end(); 
-		++file_name_it)
+	for(font_file_info_vec_t::iterator font_file_it = font_files.begin();
+		font_file_it != font_files.end();
+		++font_file_it)
 	{
 		LLFontGL *fontp = NULL;
-		string_vec_t font_paths;
-		font_paths.push_back(local_path + *file_name_it);
-		font_paths.push_back(sys_path + *file_name_it);
-#if LL_DARWIN
-		font_paths.push_back(MACOSX_FONT_PATH_LIBRARY + *file_name_it);
-		font_paths.push_back(MACOSX_FONT_PATH_LIBRARY + MACOSX_FONT_SUPPLEMENTAL + *file_name_it);
-		font_paths.push_back(sys_path +  MACOSX_FONT_SUPPLEMENTAL + *file_name_it);
-#endif
-		
-		bool is_ft_collection = (std::find(ft_collection_list.begin(), ft_collection_list.end(), *file_name_it) != ft_collection_list.end());
+
+		bool is_ft_collection = (std::find_if(font_collection_files.begin(), font_collection_files.end(),
+		                                      [&font_file_it](const LLFontFileInfo& ffi) { return font_file_it->FileName == ffi.FileName; }) != font_collection_files.end());
+
 		// *HACK: Fallback fonts don't render, so we can use that to suppress
 		// creation of OpenGL textures for test apps. JC
 		BOOL is_fallback = !is_first_found || !mCreateGLTextures;
 		F32 extra_scale = (is_fallback)?fallback_scale:1.0;
 		F32 point_size_scale = extra_scale * point_size;
 		bool is_font_loaded = false;
-		for(string_vec_t::iterator font_paths_it = font_paths.begin();
-			font_paths_it != font_paths.end();
-			++font_paths_it)
+		for(string_vec_t::iterator font_search_path_it = font_search_paths.begin();
+			font_search_path_it != font_search_paths.end();
+			++font_search_path_it)
 		{
+			const std::string font_path = *font_search_path_it + font_file_it->FileName;
+
 			fontp = new LLFontGL;
-			S32 num_faces = is_ft_collection ? fontp->getNumFaces(*font_paths_it) : 1;
+			S32 num_faces = is_ft_collection ? fontp->getNumFaces(font_path) : 1;
 			for (S32 i = 0; i < num_faces; i++)
 			{
 				if (fontp == NULL)
 				{
 					fontp = new LLFontGL;
 				}
-				if (fontp->loadFace(*font_paths_it, point_size_scale,
-								 LLFontGL::sVertDPI, LLFontGL::sHorizDPI, 2, is_fallback, i))
+				if (fontp->loadFace(font_path, point_size_scale,
+								 LLFontGL::sVertDPI, LLFontGL::sHorizDPI, is_fallback, i))
 				{
 					is_font_loaded = true;
 					if (is_first_found)
@@ -508,7 +528,8 @@ LLFontGL *LLFontRegistry::createFont(const LLFontDescriptor& desc)
 					}
 					else
 					{
-						fontlist.push_back(fontp->mFontFreetype);
+						result->mFontFreetype->addFallbackFont(fontp->mFontFreetype, font_file_it->CharFunctor);
+
 						delete fontp;
 						fontp = NULL;
 					}
@@ -523,17 +544,12 @@ LLFontGL *LLFontRegistry::createFont(const LLFontDescriptor& desc)
 		}
 		if(!is_font_loaded)
 		{
-			LL_INFOS_ONCE("LLFontRegistry") << "Couldn't load font " << *file_name_it <<  LL_ENDL;
+			LL_INFOS_ONCE("LLFontRegistry") << "Couldn't load font " << font_file_it->FileName <<  LL_ENDL;
 			delete fontp;
 			fontp = NULL;
 		}
 	}
 
-	if (result && !fontlist.empty())
-	{
-		result->mFontFreetype->setFallbackFonts(fontlist);
-	}
-
 	if (result)
 	{
 		result->mFontDescriptor = desc;
@@ -720,11 +736,22 @@ void LLFontRegistry::dump()
 				<< " size=[" << desc.getSize() << "]"
 				<< " fileNames="
 				<< LL_ENDL;
-		for (string_vec_t::const_iterator file_it=desc.getFileNames().begin();
-			 file_it != desc.getFileNames().end();
+		for (font_file_info_vec_t::const_iterator file_it=desc.getFontFiles().begin();
+			 file_it != desc.getFontFiles().end();
 			 ++file_it)
 		{
-			LL_INFOS() << "  file: " << *file_it <<LL_ENDL;
+			LL_INFOS() << "  file: " << file_it->FileName << LL_ENDL;
+		}
+	}
+}
+
+void LLFontRegistry::dumpTextures()
+{
+	for (const auto& fontEntry : mFontMap)
+	{
+		if (fontEntry.second)
+		{
+			fontEntry.second->dumpTextures();
 		}
 	}
 }
diff --git a/indra/llrender/llfontregistry.h b/indra/llrender/llfontregistry.h
index e30c81c630..b0ef72c5de 100644
--- a/indra/llrender/llfontregistry.h
+++ b/indra/llrender/llfontregistry.h
@@ -34,13 +34,32 @@ class LLFontGL;
 
 typedef std::vector<std::string> string_vec_t;
 
+struct LLFontFileInfo
+{
+	LLFontFileInfo(const std::string& file_name, const std::function<bool(llwchar)>& char_functor = nullptr)
+		: FileName(file_name)
+		, CharFunctor(char_functor)
+	{
+	}
+
+	LLFontFileInfo(const LLFontFileInfo& ffi)
+		: FileName(ffi.FileName)
+		, CharFunctor(ffi.CharFunctor)
+	{
+	}
+
+	std::string FileName;
+	std::function<bool(llwchar)> CharFunctor;
+};
+typedef std::vector<LLFontFileInfo> font_file_info_vec_t;
+
 class LLFontDescriptor
 {
 public:
 	LLFontDescriptor();
 	LLFontDescriptor(const std::string& name, const std::string& size, const U8 style);
-	LLFontDescriptor(const std::string& name, const std::string& size, const U8 style, const string_vec_t& file_names);
-	LLFontDescriptor(const std::string& name, const std::string& size, const U8 style, const string_vec_t& file_names, const string_vec_t& font_collections);
+	LLFontDescriptor(const std::string& name, const std::string& size, const U8 style, const font_file_info_vec_t& font_list);
+	LLFontDescriptor(const std::string& name, const std::string& size, const U8 style, const font_file_info_vec_t& font_list, const font_file_info_vec_t& font_collection_list);
 	LLFontDescriptor normalize() const;
 
 	bool operator<(const LLFontDescriptor& b) const;
@@ -51,19 +70,26 @@ public:
 	void setName(const std::string& name) { mName = name; }
 	const std::string& getSize() const { return mSize; }
 	void setSize(const std::string& size) { mSize = size; }
-	const std::vector<std::string>& getFileNames() const { return mFileNames; }
-	std::vector<std::string>& getFileNames() { return mFileNames; }
-	const std::vector<std::string>& getFontCollectionsList() const { return mFontCollectionsList; }
-	std::vector<std::string>& getFontCollectionsList() { return mFontCollectionsList; }
+
+	void addFontFile(const std::string& file_name, const std::string& char_functor = LLStringUtil::null);
+	const font_file_info_vec_t & getFontFiles() const { return mFontFiles; }
+	void setFontFiles(const font_file_info_vec_t& font_files) { mFontFiles = font_files; }
+	void addFontCollectionFile(const std::string& file_name, const std::string& char_functor = LLStringUtil::null);
+	const font_file_info_vec_t& getFontCollectionFiles() const { return mFontCollectionFiles; }
+	void setFontCollectionFiles(const font_file_info_vec_t& font_collection_files) { mFontCollectionFiles = font_collection_files; }
+
 	const U8 getStyle() const { return mStyle; }
 	void setStyle(U8 style) { mStyle = style; }
 
 private:
 	std::string mName;
 	std::string mSize;
-	string_vec_t mFileNames;
-	string_vec_t mFontCollectionsList;
+	font_file_info_vec_t mFontFiles;
+	font_file_info_vec_t mFontCollectionFiles;
 	U8 mStyle;
+
+	typedef std::map<std::string, std::function<bool(llwchar)>> char_functor_map_t;
+	static char_functor_map_t mCharFunctors;
 };
 
 class LLFontRegistry
@@ -94,6 +120,7 @@ public:
 	bool nameToSize(const std::string& size_name, F32& size);
 
 	void dump();
+	void dumpTextures();
 	
 	const string_vec_t& getUltimateFallbackList() const;
 
diff --git a/indra/llrender/llgl.cpp b/indra/llrender/llgl.cpp
index 4c7c8e6f5c..9d3abf32bb 100644
--- a/indra/llrender/llgl.cpp
+++ b/indra/llrender/llgl.cpp
@@ -2890,7 +2890,7 @@ void LLGLSyncFence::wait()
 	if (mSync)
 	{
 		while (glClientWaitSync(mSync, 0, FENCE_WAIT_TIME_NANOSECONDS) == GL_TIMEOUT_EXPIRED)
-		{
+		{ //track the number of times we've waited here
 		}
 	}
 }