summaryrefslogtreecommitdiff
path: root/indra/llrender/llfontregistry.cpp
blob: d2c7e466e6b4f13fcc62e7c03c6f6bfa0a0db65b (plain)
1
2
3
4
5
6
7
8
9
10
11
12
13
14
15
16
17
18
19
20
21
22
23
24
25
26
27
28
29
30
31
32
33
34
35
36
37
38
39
40
41
42
43
44
45
46
47
48
49
50
51
52
53
54
55
56
57
58
59
60
61
62
63
64
65
66
67
68
69
70
71
72
73
74
75
76
77
78
79
80
81
82
83
84
85
86
87
88
89
90
91
92
93
94
95
96
97
98
99
100
101
102
103
104
105
106
107
108
109
110
111
112
113
114
115
116
117
118
119
120
121
122
123
124
125
126
127
128
129
130
131
132
133
134
135
136
137
138
139
140
141
142
143
144
145
146
147
148
149
150
151
152
153
154
155
156
157
158
159
160
161
162
163
164
165
166
167
168
169
170
171
172
173
174
175
176
177
178
179
180
181
182
183
184
185
186
187
188
189
190
191
192
193
194
195
196
197
198
199
200
201
202
203
204
205
206
207
208
209
210
211
212
213
214
215
216
217
218
219
220
221
222
223
224
225
226
227
228
229
230
231
232
233
234
235
236
237
238
239
240
241
242
243
244
245
246
247
248
249
250
251
252
253
254
255
256
257
258
259
260
261
262
263
264
265
266
267
268
269
270
271
272
273
274
275
276
277
278
279
280
281
282
283
284
285
286
287
288
289
290
291
292
293
294
295
296
297
298
299
300
301
302
303
304
305
306
307
308
309
310
311
312
313
314
315
316
317
318
319
320
321
322
323
324
325
326
327
328
329
330
331
332
333
334
335
336
337
338
339
340
341
342
343
344
345
346
347
348
349
350
351
352
353
354
355
356
357
358
359
360
361
362
363
364
365
366
367
368
369
370
371
372
373
374
375
376
377
378
379
380
381
382
383
384
385
386
387
388
389
390
391
392
393
394
395
396
397
398
399
400
401
402
403
404
405
406
407
408
409
410
411
412
413
414
415
416
417
418
419
420
421
422
423
424
425
426
427
428
429
430
431
432
433
434
435
436
437
438
439
440
441
442
443
444
445
446
447
448
449
450
451
452
453
454
455
456
457
458
459
460
461
462
463
464
465
466
467
468
469
470
471
472
473
474
475
476
477
478
479
480
481
482
483
484
485
486
487
488
489
490
491
492
493
494
495
496
497
498
499
500
501
502
503
504
505
506
507
508
509
510
511
512
513
514
515
516
517
518
519
520
521
522
523
524
525
526
527
528
529
530
531
532
533
534
535
536
537
538
539
540
541
542
543
544
545
546
547
548
549
550
551
552
553
554
555
556
557
558
559
560
561
562
563
564
565
566
567
568
569
570
571
572
573
574
575
576
577
578
579
580
581
582
583
584
585
586
587
588
589
590
591
592
593
594
595
596
597
598
599
600
601
602
603
604
605
606
607
608
609
610
611
612
613
614
615
616
617
618
619
620
621
622
623
624
625
626
627
628
629
630
631
632
633
634
635
636
637
638
639
640
641
642
643
644
645
646
647
648
649
650
651
652
653
654
655
656
657
658
659
660
661
662
663
664
665
666
667
668
669
670
671
672
673
674
675
676
677
678
679
680
681
682
683
684
685
686
687
688
689
690
691
692
693
694
695
696
697
698
699
700
701
702
703
704
705
706
707
708
709
710
711
712
713
714
715
716
717
718
719
720
721
722
723
724
725
726
727
728
729
730
731
732
733
734
735
736
737
738
739
740
741
742
743
744
745
746
747
748
749
750
751
752
753
754
755
756
757
758
759
760
761
762
/** 
 * @file llfontregistry.cpp
 * @author Brad Payne
 * @brief Storage for fonts.
 *
 * $LicenseInfo:firstyear=2008&license=viewerlgpl$
 * 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 "llgl.h"
#include "llfontfreetype.h"
#include "llfontgl.h"
#include "llfontregistry.h"
#include <boost/tokenizer.hpp>
#include "llcontrol.h"
#include "lldir.h"
#include "llwindow.h"
#include "llxmlnode.h"

extern LLControlGroup gSavedSettings;

using std::string;
using std::map;

bool font_desc_init_from_xml(LLXMLNodePtr node, LLFontDescriptor& desc);
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)
{
}

LLFontDescriptor::LLFontDescriptor(const std::string& name,
								   const std::string& size, 
								   const U8 style,
								   const font_file_info_vec_t& font_files):
	mName(name),
	mSize(size),
	mStyle(style),
	mFontFiles(font_files)
{
}

LLFontDescriptor::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_files) :
	LLFontDescriptor(name, size, style, font_list)
{
	mFontCollectionFiles = font_collection_files;
}

LLFontDescriptor::LLFontDescriptor(const std::string& name,
								   const std::string& size, 
								   const U8 style):
	mName(name),
	mSize(size),
	mStyle(style)
{
}

bool LLFontDescriptor::operator<(const LLFontDescriptor& b) const
{
	if (mName < b.mName)
		return true;
	else if (mName > b.mName)
		return false;
	
	if (mStyle < b.mStyle)
		return true;
	else if (mStyle > b.mStyle)
		return false;

	if (mSize < b.mSize)
		return true;
	else 
		return false;
}

static const std::string s_template_string("TEMPLATE");

bool LLFontDescriptor::isTemplate() const
{
	return getSize() == s_template_string;
}

// Look for substring match and remove substring if matched.
bool removeSubString(std::string& str, const std::string& substr)
{
	size_t pos = str.find(substr);
	if (pos != string::npos)
	{
		str.erase(pos, substr.size());
		return true;
	}
	return false;
}

// Check for substring match without modifying the source string.
bool findSubString(std::string& str, const std::string& substr)
{
	size_t pos = str.find(substr);
	if (pos != string::npos)
	{
		return true;
	}
	return false;
}


// Normal form is
// - raw name
// - bold, italic style info reflected in both style and font name.
// - other style info removed.
// - size info moved to mSize, defaults to Medium
// For example,
// - "SansSerifHuge" would normalize to { "SansSerif", "Huge", 0 }
// - "SansSerifBold" would normalize to { "SansSerifBold", "Medium", BOLD }
LLFontDescriptor LLFontDescriptor::normalize() const
{
	std::string new_name(mName);
	std::string new_size(mSize);
	U8 new_style(mStyle);

	// Only care about style to extent it can be picked up by font.
	new_style &= (LLFontGL::BOLD | LLFontGL::ITALIC);

	// All these transformations are to support old-style font specifications.
	if (removeSubString(new_name,"Small"))
		new_size = "Small";
	if (removeSubString(new_name,"Big"))
		new_size = "Large";
	if (removeSubString(new_name,"Medium"))
		new_size = "Medium";
	if (removeSubString(new_name,"Large"))
		new_size = "Large";
	if (removeSubString(new_name,"Huge"))
		new_size = "Huge";

	// HACK - Monospace is the only one we don't remove, so
	// name "Monospace" doesn't get taken down to ""
	// For other fonts, there's no ambiguity between font name and size specifier.
	if (new_size != s_template_string && new_size.empty() && findSubString(new_name,"Monospace"))
		new_size = "Monospace";
	if (new_size.empty())
		new_size = "Medium";

	if (removeSubString(new_name,"Bold"))
		new_style |= LLFontGL::BOLD;

	if (removeSubString(new_name,"Italic"))
		new_style |= LLFontGL::ITALIC;

	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)
:	mCreateGLTextures(create_gl_textures)
{
	// This is potentially a slow directory traversal, so we want to
	// cache the result.
	mUltimateFallbackList = LLWindow::getDynamicFallbackFontList();
}

LLFontRegistry::~LLFontRegistry()
{
	clear();
}

bool LLFontRegistry::parseFontInfo(const std::string& xml_filename)
{
	bool success = false;  // Succeed if we find and read at least one XUI file
	const string_vec_t xml_paths = gDirUtilp->findSkinnedFilenames(LLDir::XUI, xml_filename);
	if (xml_paths.empty())
	{
		// We didn't even find one single XUI file
		return false;
	}

	for (string_vec_t::const_iterator path_it = xml_paths.begin();
		 path_it != xml_paths.end();
		 ++path_it)
	{
		LLXMLNodePtr root;
		bool parsed_file = LLXMLNode::parseFile(*path_it, root, NULL);

		if (!parsed_file)
			continue;

		if ( root.isNull() || ! root->hasName( "fonts" ) )
		{
			LL_WARNS() << "Bad font info file: " << *path_it << LL_ENDL;
			continue;
		}

		std::string root_name;
		root->getAttributeString("name",root_name);
		if (root->hasName("fonts"))
		{
			// Expect a collection of children consisting of "font" or "font_size" entries
			bool init_succ = init_from_xml(this, root);
			success = success || init_succ;
		}
	}

	//if (success)
	//	dump();

	return success;
}

std::string currentOsName()
{
#if LL_WINDOWS
	return "Windows";
#elif LL_DARWIN
	return "Mac";
#elif LL_LINUX
	return "Linux";
#else
	return "";
#endif
}

bool font_desc_init_from_xml(LLXMLNodePtr node, LLFontDescriptor& desc)
{
	if (node->hasName("font"))
	{
		std::string attr_name;
		if (node->getAttributeString("name",attr_name))
		{
			desc.setName(attr_name);
		}

		std::string attr_style;
		if (node->getAttributeString("font_style",attr_style))
		{
			desc.setStyle(LLFontGL::getStyleFromString(attr_style));
		}

		desc.setSize(s_template_string);
	}

	LLXMLNodePtr child;	
	for (child = node->getFirstChild(); child.notNull(); child = child->getNextSibling())
	{
		std::string child_name;
		child->getAttributeString("name",child_name);
		if (child->hasName("file"))
		{
			std::string font_file_name = child->getTextContents();
			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.addFontCollectionFile(font_file_name, char_functor);
				}
			}

			desc.addFontFile(font_file_name, char_functor);
		}
		else if (child->hasName("os"))
		{
			if (child_name == currentOsName())
			{
				font_desc_init_from_xml(child, desc);
			}
		}
	}
	return true;
}

bool init_from_xml(LLFontRegistry* registry, LLXMLNodePtr node)
{
	LLXMLNodePtr child;
	
	for (child = node->getFirstChild(); child.notNull(); child = child->getNextSibling())
	{
		std::string child_name;
		child->getAttributeString("name",child_name);
		if (child->hasName("font"))
		{
			LLFontDescriptor desc;
			bool font_succ = font_desc_init_from_xml(child, desc);
			LLFontDescriptor norm_desc = desc.normalize();
			if (font_succ)
			{
				// if this is the first time we've seen this font name,
				// create a new template map entry for it.
				const LLFontDescriptor *match_desc = registry->getMatchingFontDesc(desc);
				if (match_desc == NULL)
				{
					// Create a new entry (with no corresponding font).
					registry->mFontMap[norm_desc] = NULL;
				}
				// otherwise, find the existing entry and combine data. 
				else
				{
					// Prepend files from desc.
					// 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.
					font_file_info_vec_t font_files = match_desc->getFontFiles();
					font_files.insert(font_files.begin(),
									  desc.getFontFiles().begin(),
									  desc.getFontFiles().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.setFontFiles(font_files);
					new_desc.setFontCollectionFiles(font_collection_files);
					registry->mFontMap.erase(*match_desc);
					registry->mFontMap[new_desc] = NULL;
				}
			}
		}
		else if (child->hasName("font_size"))
		{
			std::string size_name;
			F32 size_value;
			if (child->getAttributeString("name",size_name) &&
				child->getAttributeF32("size",size_value))
			{
				registry->mFontSizes[size_name] = size_value;
			}

		}
	}
	return true;
}

bool LLFontRegistry::nameToSize(const std::string& size_name, F32& size)
{
	font_size_map_t::iterator it = mFontSizes.find(size_name);
	if (it != mFontSizes.end())
	{
		size = it->second;
		return true;
	}
	return false;
}


LLFontGL *LLFontRegistry::createFont(const LLFontDescriptor& desc)
{
	// Name should hold a font name recognized as a setting; the value
	// of the setting should be a list of font files.
	// Size should be a recognized string value
	// Style should be a set of flags including any implied by the font name.

	// First decipher the requested size.
	LLFontDescriptor norm_desc = desc.normalize();
	F32 point_size;
	bool found_size = nameToSize(norm_desc.getSize(),point_size);
	if (!found_size)
	{
		LL_WARNS() << "createFont unrecognized size " << norm_desc.getSize() << LL_ENDL;
		return NULL;
	}
	LL_INFOS() << "createFont " << norm_desc.getName() << " size " << norm_desc.getSize() << " style " << ((S32) norm_desc.getStyle()) << LL_ENDL;
	F32 fallback_scale = 1.0;

	// Find corresponding font template (based on same descriptor with no size specified)
	LLFontDescriptor template_desc(norm_desc);
	template_desc.setSize(s_template_string);
	const LLFontDescriptor *match_desc = getClosestFontTemplate(template_desc);
	if (!match_desc)
	{
		LL_WARNS() << "createFont failed, no template found for "
				<< norm_desc.getName() << " style [" << ((S32)norm_desc.getStyle()) << "]" << LL_ENDL;
		return NULL;
	}

	// See whether this best-match font has already been instantiated in the requested size.
	LLFontDescriptor nearest_exact_desc = *match_desc;
	nearest_exact_desc.setSize(norm_desc.getSize());
	font_reg_map_t::iterator it = mFontMap.find(nearest_exact_desc);
	// If we fail to find a font in the fonts directory, it->second might be NULL.
	// We shouldn't construcnt a font with a NULL mFontFreetype.
	// This may not be the best solution, but it at least prevents a crash.
	if (it != mFontMap.end() && it->second != NULL)
	{
		LL_INFOS() << "-- matching font exists: " << nearest_exact_desc.getName() << " size " << nearest_exact_desc.getSize() << " style " << ((S32) nearest_exact_desc.getStyle()) << LL_ENDL;
		
		// copying underlying Freetype font, and storing in LLFontGL with requested font descriptor
		LLFontGL *font = new LLFontGL;
		font->mFontDescriptor = desc;
		font->mFontFreetype = it->second->mFontFreetype;
		mFontMap[desc] = font;

		return font;
	}

	// Build list of font names to look for.
	// Files specified for this font come first, followed by those from the default descriptor.
	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)
	{
		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.
	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 (font_files.empty())
	{
		LL_WARNS() << "createFont failed, no file names specified" << LL_ENDL;
		return NULL;
	}

	LLFontGL *result = NULL;

	// 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;
	
	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(font_file_info_vec_t::iterator font_file_it = font_files.begin();
		font_file_it != font_files.end();
		++font_file_it)
	{
		LLFontGL *fontp = NULL;

		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_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_path) : 1;
			for (S32 i = 0; i < num_faces; i++)
			{
				if (fontp == NULL)
				{
					fontp = new LLFontGL;
				}
				if (fontp->loadFace(font_path, point_size_scale,
								 LLFontGL::sVertDPI, LLFontGL::sHorizDPI, is_fallback, i))
				{
					is_font_loaded = true;
					if (is_first_found)
					{
						result = fontp;
						is_first_found = false;
					}
					else
					{
						result->mFontFreetype->addFallbackFont(fontp->mFontFreetype, font_file_it->CharFunctor);

						delete fontp;
						fontp = NULL;
					}
				}
				else
				{
					delete fontp;
					fontp = NULL;
				}
			}
			if (is_font_loaded) break;
		}
		if(!is_font_loaded)
		{
			LL_INFOS_ONCE("LLFontRegistry") << "Couldn't load font " << font_file_it->FileName <<  LL_ENDL;
			delete fontp;
			fontp = NULL;
		}
	}

	if (result)
	{
		result->mFontDescriptor = desc;
	}
	else
	{
		LL_WARNS() << "createFont failed in some way" << LL_ENDL;
	}

	mFontMap[desc] = result;
	return result;
}

void LLFontRegistry::reset()
{
	for (font_reg_map_t::iterator it = mFontMap.begin();
		 it != mFontMap.end();
		 ++it)
	{
		// Reset the corresponding font but preserve the entry.
		if (it->second)
			it->second->reset();
	}
}

void LLFontRegistry::clear()
{
	for (font_reg_map_t::iterator it = mFontMap.begin();
		 it != mFontMap.end();
		 ++it)
	{
		LLFontGL *fontp = it->second;
		delete fontp;
	}
	mFontMap.clear();
}

void LLFontRegistry::destroyGL()
{
	for (font_reg_map_t::iterator it = mFontMap.begin();
		 it != mFontMap.end();
		 ++it)
	{
		// Reset the corresponding font but preserve the entry.
		if (it->second)
			it->second->destroyGL();
	}
}

LLFontGL *LLFontRegistry::getFont(const LLFontDescriptor& desc)
{
	font_reg_map_t::iterator it = mFontMap.find(desc);
	if (it != mFontMap.end())
		return it->second;
	else
	{
		LLFontGL *fontp = createFont(desc);
		if (!fontp)
		{
			LL_WARNS() << "getFont failed, name " << desc.getName()
					<<" style=[" << ((S32) desc.getStyle()) << "]"
					<< " size=[" << desc.getSize() << "]" << LL_ENDL;
		}
		else
		{
			//generate glyphs for ASCII chars to avoid stalls later
			fontp->generateASCIIglyphs();
		}
		return fontp;
	}
}

const LLFontDescriptor *LLFontRegistry::getMatchingFontDesc(const LLFontDescriptor& desc)
{
	LLFontDescriptor norm_desc = desc.normalize();

	font_reg_map_t::iterator it = mFontMap.find(norm_desc);
	if (it != mFontMap.end())
		return &(it->first);
	else
		return NULL;
}

static U32 bitCount(U8 c)
{
	U32 count = 0;
	if (c & 1) 
		count++;
	if (c & 2)
		count++;
	if (c & 4)
		count++;
	if (c & 8)
		count++;
	if (c & 16)
		count++;
	if (c & 32)
		count++;
	if (c & 64)
		count++;
	if (c & 128)
		count++;
	return count;
}

// Find nearest match for the requested descriptor.
const LLFontDescriptor *LLFontRegistry::getClosestFontTemplate(const LLFontDescriptor& desc)
{
	const LLFontDescriptor *exact_match_desc = getMatchingFontDesc(desc);
	if (exact_match_desc)
	{
		return exact_match_desc;
	}

	LLFontDescriptor norm_desc = desc.normalize();

	const LLFontDescriptor *best_match_desc = NULL;
	for (font_reg_map_t::iterator it = mFontMap.begin();
		 it != mFontMap.end();
		 ++it)
	{
		const LLFontDescriptor* curr_desc = &(it->first);

		// Ignore if not a template.
		if (!curr_desc->isTemplate())
			continue;

		// Ignore if font name is wrong.
		if (curr_desc->getName() != norm_desc.getName())
			continue;

		// Reject font if it matches any bits we don't want
		if (curr_desc->getStyle() & ~norm_desc.getStyle())
		{
			continue;
		}

		// Take if it's the first plausible candidate we've found.
		if (!best_match_desc)
		{
			best_match_desc = curr_desc;
			continue;
		}

		// Take if it matches more bits than anything before.
		U8 best_style_match_bits =
			norm_desc.getStyle() & best_match_desc->getStyle();
		U8 curr_style_match_bits =
			norm_desc.getStyle() & curr_desc->getStyle();
		if (bitCount(curr_style_match_bits) > bitCount(best_style_match_bits))
		{
			best_match_desc = curr_desc;
			continue;
		}

		// Tie-breaker: take if it matches bold.
		if (curr_style_match_bits & LLFontGL::BOLD)  // Bold is requested and this descriptor matches it.
		{
			best_match_desc = curr_desc;
			continue;
		}
	}

	// Nothing matched.
	return best_match_desc;
}

void LLFontRegistry::dump()
{
	LL_INFOS() << "LLFontRegistry dump: " << LL_ENDL;
	for (font_size_map_t::iterator size_it = mFontSizes.begin();
		 size_it != mFontSizes.end();
		 ++size_it)
	{
		LL_INFOS() << "Size: " << size_it->first << " => " << size_it->second << LL_ENDL;
	}
	for (font_reg_map_t::iterator font_it = mFontMap.begin();
		 font_it != mFontMap.end();
		 ++font_it)
	{
		const LLFontDescriptor& desc = font_it->first;
		LL_INFOS() << "Font: name=" << desc.getName()
				<< " style=[" << ((S32)desc.getStyle()) << "]"
				<< " size=[" << desc.getSize() << "]"
				<< " fileNames="
				<< LL_ENDL;
		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->FileName << LL_ENDL;
		}
	}
}

void LLFontRegistry::dumpTextures()
{
	for (const auto& fontEntry : mFontMap)
	{
		if (fontEntry.second)
		{
			fontEntry.second->dumpTextures();
		}
	}
}

const string_vec_t& LLFontRegistry::getUltimateFallbackList() const 
{ 
	return mUltimateFallbackList;
}