summaryrefslogtreecommitdiff
path: root/src/os/windows/font_win32.cpp
blob: 59d5e0ad85138d8d38022e49d69f38d728a5818c (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
/*
 * This file is part of OpenTTD.
 * OpenTTD is free software; you can redistribute it and/or modify it under the terms of the GNU General Public License as published by the Free Software Foundation, version 2.
 * OpenTTD 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 General Public License for more details. You should have received a copy of the GNU General Public License along with OpenTTD. If not, see <http://www.gnu.org/licenses/>.
 */

/** @file font_win32.cpp Functions related to font handling on Win32. */

#include "../../stdafx.h"
#include "../../debug.h"
#include "font_win32.h"
#include "../../blitter/factory.hpp"
#include "../../core/alloc_func.hpp"
#include "../../core/math_func.hpp"
#include "../../fileio_func.h"
#include "../../fontdetection.h"
#include "../../fontcache.h"
#include "../../string_func.h"
#include "../../strings_func.h"
#include "../../zoom_func.h"

#include "../../table/control_codes.h"

#include <windows.h>
#include <shlobj.h> /* SHGetFolderPath */
#include "os/windows/win32.h"
#undef small // Say what, Windows?

#include "safeguards.h"

#ifdef WITH_FREETYPE

#include <ft2build.h>
#include FT_FREETYPE_H

extern FT_Library _library;

/**
 * Get the short DOS 8.3 format for paths.
 * FreeType doesn't support Unicode filenames and Windows' fopen (as used
 * by FreeType) doesn't support UTF-8 filenames. So we have to convert the
 * filename into something that isn't UTF-8 but represents the Unicode file
 * name. This is the short DOS 8.3 format. This does not contain any
 * characters that fopen doesn't support.
 * @param long_path the path in system encoding.
 * @return the short path in ANSI (ASCII).
 */
static const char *GetShortPath(const wchar_t *long_path)
{
	static char short_path[MAX_PATH];
	wchar_t short_path_w[MAX_PATH];
	GetShortPathName(long_path, short_path_w, lengthof(short_path_w));
	WideCharToMultiByte(CP_ACP, 0, short_path_w, -1, short_path, lengthof(short_path), nullptr, nullptr);
	return short_path;
}

/* Get the font file to be loaded into Freetype by looping the registry
 * location where windows lists all installed fonts. Not very nice, will
 * surely break if the registry path changes, but it works. Much better
 * solution would be to use CreateFont, and extract the font data from it
 * by GetFontData. The problem with this is that the font file needs to be
 * kept in memory then until the font is no longer needed. This could mean
 * an additional memory usage of 30MB (just for fonts!) when using an eastern
 * font for all font sizes */
static const wchar_t *FONT_DIR_NT = L"SOFTWARE\\Microsoft\\Windows NT\\CurrentVersion\\Fonts";
FT_Error GetFontByFaceName(const char *font_name, FT_Face *face)
{
	FT_Error err = FT_Err_Cannot_Open_Resource;
	HKEY hKey;
	LONG ret;
	wchar_t vbuffer[MAX_PATH], dbuffer[256];
	wchar_t *pathbuf;
	const char *font_path;
	uint index;
	size_t path_len;

	ret = RegOpenKeyEx(HKEY_LOCAL_MACHINE, FONT_DIR_NT, 0, KEY_READ, &hKey);

	if (ret != ERROR_SUCCESS) {
		DEBUG(freetype, 0, "Cannot open registry key HKLM\\SOFTWARE\\Microsoft\\Windows NT\\CurrentVersion\\Fonts");
		return err;
	}

	/* Convert font name to file system encoding. */
	wchar_t *font_namep = wcsdup(OTTD2FS(font_name).c_str());

	for (index = 0;; index++) {
		wchar_t *s;
		DWORD vbuflen = lengthof(vbuffer);
		DWORD dbuflen = lengthof(dbuffer);

		ret = RegEnumValue(hKey, index, vbuffer, &vbuflen, nullptr, nullptr, (byte *)dbuffer, &dbuflen);
		if (ret != ERROR_SUCCESS) goto registry_no_font_found;

		/* The font names in the registry are of the following 3 forms:
		 * - ADMUI3.fon
		 * - Book Antiqua Bold (TrueType)
		 * - Batang & BatangChe & Gungsuh & GungsuhChe (TrueType)
		 * We will strip the font-type '()' if any and work with the font name
		 * itself, which must match exactly; if...
		 * TTC files, font files which contain more than one font are separated
		 * by '&'. Our best bet will be to do substr match for the fontname
		 * and then let FreeType figure out which index to load */
		s = wcschr(vbuffer, L'(');
		if (s != nullptr) s[-1] = '\0';

		if (wcschr(vbuffer, L'&') == nullptr) {
			if (wcsicmp(vbuffer, font_namep) == 0) break;
		} else {
			if (wcsstr(vbuffer, font_namep) != nullptr) break;
		}
	}

	if (!SUCCEEDED(SHGetFolderPath(nullptr, CSIDL_FONTS, nullptr, SHGFP_TYPE_CURRENT, vbuffer))) {
		DEBUG(freetype, 0, "SHGetFolderPath cannot return fonts directory");
		goto folder_error;
	}

	/* Some fonts are contained in .ttc files, TrueType Collection fonts. These
	 * contain multiple fonts inside this single file. GetFontData however
	 * returns the whole file, so we need to check each font inside to get the
	 * proper font. */
	path_len = wcslen(vbuffer) + wcslen(dbuffer) + 2; // '\' and terminating nul.
	pathbuf = AllocaM(wchar_t, path_len);
	_snwprintf(pathbuf, path_len, L"%s\\%s", vbuffer, dbuffer);

	/* Convert the path into something that FreeType understands. */
	font_path = GetShortPath(pathbuf);

	index = 0;
	do {
		err = FT_New_Face(_library, font_path, index, face);
		if (err != FT_Err_Ok) break;

		if (strncasecmp(font_name, (*face)->family_name, strlen((*face)->family_name)) == 0) break;
		/* Try english name if font name failed */
		if (strncasecmp(font_name + strlen(font_name) + 1, (*face)->family_name, strlen((*face)->family_name)) == 0) break;
		err = FT_Err_Cannot_Open_Resource;

	} while ((FT_Long)++index != (*face)->num_faces);


folder_error:
registry_no_font_found:
	free(font_namep);
	RegCloseKey(hKey);
	return err;
}

/**
 * Fonts can have localised names and when the system locale is the same as
 * one of those localised names Windows will always return that localised name
 * instead of allowing to get the non-localised (English US) name of the font.
 * This will later on give problems as freetype uses the non-localised name of
 * the font and we need to compare based on that name.
 * Windows furthermore DOES NOT have an API to get the non-localised name nor
 * can we override the system locale. This means that we have to actually read
 * the font itself to gather the font name we want.
 * Based on: http://blogs.msdn.com/michkap/archive/2006/02/13/530814.aspx
 * @param logfont the font information to get the english name of.
 * @return the English name (if it could be found).
 */
static const char *GetEnglishFontName(const ENUMLOGFONTEX *logfont)
{
	static char font_name[MAX_PATH];
	const char *ret_font_name = nullptr;
	uint pos = 0;
	HDC dc;
	HGDIOBJ oldfont;
	byte *buf;
	DWORD dw;
	uint16 format, count, stringOffset, platformId, encodingId, languageId, nameId, length, offset;

	HFONT font = CreateFontIndirect(&logfont->elfLogFont);
	if (font == nullptr) goto err1;

	dc = GetDC(nullptr);
	oldfont = SelectObject(dc, font);
	dw = GetFontData(dc, 'eman', 0, nullptr, 0);
	if (dw == GDI_ERROR) goto err2;

	buf = MallocT<byte>(dw);
	dw = GetFontData(dc, 'eman', 0, buf, dw);
	if (dw == GDI_ERROR) goto err3;

	format = buf[pos++] << 8;
	format += buf[pos++];
	assert(format == 0);
	count = buf[pos++] << 8;
	count += buf[pos++];
	stringOffset = buf[pos++] << 8;
	stringOffset += buf[pos++];
	for (uint i = 0; i < count; i++) {
		platformId = buf[pos++] << 8;
		platformId += buf[pos++];
		encodingId = buf[pos++] << 8;
		encodingId += buf[pos++];
		languageId = buf[pos++] << 8;
		languageId += buf[pos++];
		nameId = buf[pos++] << 8;
		nameId += buf[pos++];
		if (nameId != 1) {
			pos += 4; // skip length and offset
			continue;
		}
		length = buf[pos++] << 8;
		length += buf[pos++];
		offset = buf[pos++] << 8;
		offset += buf[pos++];

		/* Don't buffer overflow */
		length = std::min<uint16>(length, MAX_PATH - 1);
		for (uint j = 0; j < length; j++) font_name[j] = buf[stringOffset + offset + j];
		font_name[length] = '\0';

		if ((platformId == 1 && languageId == 0) ||      // Macintosh English
			(platformId == 3 && languageId == 0x0409)) { // Microsoft English (US)
			ret_font_name = font_name;
			break;
		}
	}

err3:
	free(buf);
err2:
	SelectObject(dc, oldfont);
	ReleaseDC(nullptr, dc);
	DeleteObject(font);
err1:
	return ret_font_name == nullptr ? FS2OTTD((const wchar_t *)logfont->elfFullName) : ret_font_name;
}
#endif /* WITH_FREETYPE */

class FontList {
protected:
	wchar_t **fonts;
	uint items;
	uint capacity;

public:
	FontList() : fonts(nullptr), items(0), capacity(0) { };

	~FontList() {
		if (this->fonts == nullptr) return;

		for (uint i = 0; i < this->items; i++) {
			free(this->fonts[i]);
		}

		free(this->fonts);
	}

	bool Add(const wchar_t *font) {
		for (uint i = 0; i < this->items; i++) {
			if (wcscmp(this->fonts[i], font) == 0) return false;
		}

		if (this->items == this->capacity) {
			this->capacity += 10;
			this->fonts = ReallocT(this->fonts, this->capacity);
		}

		this->fonts[this->items++] = wcsdup(font);

		return true;
	}
};

struct EFCParam {
	FreeTypeSettings *settings;
	LOCALESIGNATURE  locale;
	MissingGlyphSearcher *callback;
	FontList fonts;
};

static int CALLBACK EnumFontCallback(const ENUMLOGFONTEX *logfont, const NEWTEXTMETRICEX *metric, DWORD type, LPARAM lParam)
{
	EFCParam *info = (EFCParam *)lParam;

	/* Skip duplicates */
	if (!info->fonts.Add((const wchar_t *)logfont->elfFullName)) return 1;
	/* Only use TrueType fonts */
	if (!(type & TRUETYPE_FONTTYPE)) return 1;
	/* Don't use SYMBOL fonts */
	if (logfont->elfLogFont.lfCharSet == SYMBOL_CHARSET) return 1;
	/* Use monospaced fonts when asked for it. */
	if (info->callback->Monospace() && (logfont->elfLogFont.lfPitchAndFamily & (FF_MODERN | FIXED_PITCH)) != (FF_MODERN | FIXED_PITCH)) return 1;

	/* The font has to have at least one of the supported locales to be usable. */
	if ((metric->ntmFontSig.fsCsb[0] & info->locale.lsCsbSupported[0]) == 0 && (metric->ntmFontSig.fsCsb[1] & info->locale.lsCsbSupported[1]) == 0) {
		/* On win9x metric->ntmFontSig seems to contain garbage. */
		FONTSIGNATURE fs;
		memset(&fs, 0, sizeof(fs));
		HFONT font = CreateFontIndirect(&logfont->elfLogFont);
		if (font != nullptr) {
			HDC dc = GetDC(nullptr);
			HGDIOBJ oldfont = SelectObject(dc, font);
			GetTextCharsetInfo(dc, &fs, 0);
			SelectObject(dc, oldfont);
			ReleaseDC(nullptr, dc);
			DeleteObject(font);
		}
		if ((fs.fsCsb[0] & info->locale.lsCsbSupported[0]) == 0 && (fs.fsCsb[1] & info->locale.lsCsbSupported[1]) == 0) return 1;
	}

	char font_name[MAX_PATH];
	convert_from_fs((const wchar_t *)logfont->elfFullName, font_name, lengthof(font_name));

#ifdef WITH_FREETYPE
	/* Add english name after font name */
	const char *english_name = GetEnglishFontName(logfont);
	strecpy(font_name + strlen(font_name) + 1, english_name, lastof(font_name));

	/* Check whether we can actually load the font. */
	bool ft_init = _library != nullptr;
	bool found = false;
	FT_Face face;
	/* Init FreeType if needed. */
	if ((ft_init || FT_Init_FreeType(&_library) == FT_Err_Ok) && GetFontByFaceName(font_name, &face) == FT_Err_Ok) {
		FT_Done_Face(face);
		found = true;
	}
	if (!ft_init) {
		/* Uninit FreeType if we did the init. */
		FT_Done_FreeType(_library);
		_library = nullptr;
	}

	if (!found) return 1;
#else
	const char *english_name = font_name;
#endif /* WITH_FREETYPE */

	info->callback->SetFontNames(info->settings, font_name, &logfont->elfLogFont);
	if (info->callback->FindMissingGlyphs()) return 1;
	DEBUG(freetype, 1, "Fallback font: %s (%s)", font_name, english_name);
	return 0; // stop enumerating
}

bool SetFallbackFont(FreeTypeSettings *settings, const char *language_isocode, int winlangid, MissingGlyphSearcher *callback)
{
	DEBUG(freetype, 1, "Trying fallback fonts");
	EFCParam langInfo;
	if (GetLocaleInfo(MAKELCID(winlangid, SORT_DEFAULT), LOCALE_FONTSIGNATURE, (LPTSTR)&langInfo.locale, sizeof(langInfo.locale) / sizeof(wchar_t)) == 0) {
		/* Invalid langid or some other mysterious error, can't determine fallback font. */
		DEBUG(freetype, 1, "Can't get locale info for fallback font (langid=0x%x)", winlangid);
		return false;
	}
	langInfo.settings = settings;
	langInfo.callback = callback;

	LOGFONT font;
	/* Enumerate all fonts. */
	font.lfCharSet = DEFAULT_CHARSET;
	font.lfFaceName[0] = '\0';
	font.lfPitchAndFamily = 0;

	HDC dc = GetDC(nullptr);
	int ret = EnumFontFamiliesEx(dc, &font, (FONTENUMPROC)&EnumFontCallback, (LPARAM)&langInfo, 0);
	ReleaseDC(nullptr, dc);
	return ret == 0;
}


#ifndef ANTIALIASED_QUALITY
#define ANTIALIASED_QUALITY     4
#endif

/**
 * Create a new Win32FontCache.
 * @param fs      The font size that is going to be cached.
 * @param logfont The font that has to be loaded.
 * @param pixels  The number of pixels this font should be high.
 */
Win32FontCache::Win32FontCache(FontSize fs, const LOGFONT &logfont, int pixels) : TrueTypeFontCache(fs, pixels), logfont(logfont)
{
	this->dc = CreateCompatibleDC(nullptr);
	this->SetFontSize(fs, pixels);
	this->fontname = FS2OTTD(this->logfont.lfFaceName);
}

Win32FontCache::~Win32FontCache()
{
	this->ClearFontCache();
	DeleteDC(this->dc);
	DeleteObject(this->font);
}

void Win32FontCache::SetFontSize(FontSize fs, int pixels)
{
	if (pixels == 0) {
		/* Try to determine a good height based on the minimal height recommended by the font. */
		int scaled_height = ScaleFontTrad(this->GetDefaultFontHeight(this->fs));
		pixels = scaled_height;

		HFONT temp = CreateFontIndirect(&this->logfont);
		if (temp != nullptr) {
			HGDIOBJ old = SelectObject(this->dc, temp);

			UINT size = GetOutlineTextMetrics(this->dc, 0, nullptr);
			LPOUTLINETEXTMETRIC otm = (LPOUTLINETEXTMETRIC)AllocaM(BYTE, size);
			GetOutlineTextMetrics(this->dc, size, otm);

			/* Font height is minimum height plus the difference between the default
			 * height for this font size and the small size. */
			int diff = scaled_height - ScaleFontTrad(this->GetDefaultFontHeight(FS_SMALL));
			pixels = Clamp(std::min(otm->otmusMinimumPPEM, MAX_FONT_MIN_REC_SIZE) + diff, scaled_height, MAX_FONT_SIZE);

			SelectObject(dc, old);
			DeleteObject(temp);
		}
	} else {
		pixels = ScaleFontTrad(pixels);
	}
	this->used_size = pixels;

	/* Create GDI font handle. */
	this->logfont.lfHeight = -pixels;
	this->logfont.lfWidth = 0;
	this->logfont.lfOutPrecision = ANTIALIASED_QUALITY;

	if (this->font != nullptr) {
		SelectObject(dc, this->old_font);
		DeleteObject(this->font);
	}
	this->font = CreateFontIndirect(&this->logfont);
	this->old_font = SelectObject(this->dc, this->font);

	/* Query the font metrics we needed. */
	UINT otmSize = GetOutlineTextMetrics(this->dc, 0, nullptr);
	POUTLINETEXTMETRIC otm = (POUTLINETEXTMETRIC)AllocaM(BYTE, otmSize);
	GetOutlineTextMetrics(this->dc, otmSize, otm);

	this->units_per_em = otm->otmEMSquare;
	this->ascender = otm->otmTextMetrics.tmAscent;
	this->descender = otm->otmTextMetrics.tmDescent;
	this->height = this->ascender + this->descender;
	this->glyph_size.cx = otm->otmTextMetrics.tmMaxCharWidth;
	this->glyph_size.cy = otm->otmTextMetrics.tmHeight;

	DEBUG(freetype, 2, "Loaded font '%s' with size %d", FS2OTTD((LPWSTR)((BYTE *)otm + (ptrdiff_t)otm->otmpFullName)).c_str(), pixels);
}

/**
 * Reset cached glyphs.
 */
void Win32FontCache::ClearFontCache()
{
	/* GUI scaling might have changed, determine font size anew if it was automatically selected. */
	if (this->font != nullptr) this->SetFontSize(this->fs, this->req_size);

	this->TrueTypeFontCache::ClearFontCache();
}

/* virtual */ const Sprite *Win32FontCache::InternalGetGlyph(GlyphID key, bool aa)
{
	GLYPHMETRICS gm;
	MAT2 mat = { {0, 1}, {0, 0}, {0, 0}, {0, 1} };

	/* Make a guess for the needed memory size. */
	DWORD size = this->glyph_size.cy * Align(aa ? this->glyph_size.cx : std::max(this->glyph_size.cx / 8l, 1l), 4); // Bitmap data is DWORD-aligned rows.
	byte *bmp = AllocaM(byte, size);
	size = GetGlyphOutline(this->dc, key, GGO_GLYPH_INDEX | (aa ? GGO_GRAY8_BITMAP : GGO_BITMAP), &gm, size, bmp, &mat);

	if (size == GDI_ERROR) {
		/* No dice with the guess. First query size of needed glyph memory, then allocate the
		 * memory and query again. This dance is necessary as some glyphs will only render with
		 * the exact matching size; e.g. the space glyph has no pixels and must be requested
		 * with size == 0, anything else fails. Unfortunately, a failed call doesn't return any
		 * info about the size and thus the triple GetGlyphOutline()-call. */
		size = GetGlyphOutline(this->dc, key, GGO_GLYPH_INDEX | (aa ? GGO_GRAY8_BITMAP : GGO_BITMAP), &gm, 0, nullptr, &mat);
		if (size == GDI_ERROR) usererror("Unable to render font glyph");
		bmp = AllocaM(byte, size);
		GetGlyphOutline(this->dc, key, GGO_GLYPH_INDEX | (aa ? GGO_GRAY8_BITMAP : GGO_BITMAP), &gm, size, bmp, &mat);
	}

	/* Add 1 pixel for the shadow on the medium font. Our sprite must be at least 1x1 pixel. */
	uint width = std::max(1U, (uint)gm.gmBlackBoxX + (this->fs == FS_NORMAL));
	uint height = std::max(1U, (uint)gm.gmBlackBoxY + (this->fs == FS_NORMAL));

	/* Limit glyph size to prevent overflows later on. */
	if (width > MAX_GLYPH_DIM || height > MAX_GLYPH_DIM) usererror("Font glyph is too large");

	/* GDI has rendered the glyph, now we allocate a sprite and copy the image into it. */
	SpriteLoader::Sprite sprite;
	sprite.AllocateData(ZOOM_LVL_NORMAL, width * height);
	sprite.type = ST_FONT;
	sprite.colours = (aa ? SCC_PAL | SCC_ALPHA : SCC_PAL);
	sprite.width = width;
	sprite.height = height;
	sprite.x_offs = gm.gmptGlyphOrigin.x;
	sprite.y_offs = this->ascender - gm.gmptGlyphOrigin.y;

	if (size > 0) {
		/* All pixel data returned by GDI is in the form of DWORD-aligned rows.
		 * For a non anti-aliased glyph, the returned bitmap has one bit per pixel.
		 * For anti-aliased rendering, GDI uses the strange value range of 0 to 64,
		 * inclusively. To map this to 0 to 255, we shift left by two and then
		 * subtract one. */
		uint pitch = Align(aa ? gm.gmBlackBoxX : std::max(gm.gmBlackBoxX / 8u, 1u), 4);

		/* Draw shadow for medium size. */
		if (this->fs == FS_NORMAL && !aa) {
			for (uint y = 0; y < gm.gmBlackBoxY; y++) {
				for (uint x = 0; x < gm.gmBlackBoxX; x++) {
					if (aa ? (bmp[x + y * pitch] > 0) : HasBit(bmp[(x / 8) + y * pitch], 7 - (x % 8))) {
						sprite.data[1 + x + (1 + y) * sprite.width].m = SHADOW_COLOUR;
						sprite.data[1 + x + (1 + y) * sprite.width].a = aa ? (bmp[x + y * pitch] << 2) - 1 : 0xFF;
					}
				}
			}
		}

		for (uint y = 0; y < gm.gmBlackBoxY; y++) {
			for (uint x = 0; x < gm.gmBlackBoxX; x++) {
				if (aa ? (bmp[x + y * pitch] > 0) : HasBit(bmp[(x / 8) + y * pitch], 7 - (x % 8))) {
					sprite.data[x + y * sprite.width].m = FACE_COLOUR;
					sprite.data[x + y * sprite.width].a = aa ? (bmp[x + y * pitch] << 2) - 1 : 0xFF;
				}
			}
		}
	}

	GlyphEntry new_glyph;
	new_glyph.sprite = BlitterFactory::GetCurrentBlitter()->Encode(&sprite, SimpleSpriteAlloc);
	new_glyph.width = gm.gmCellIncX;

	this->SetGlyphPtr(key, &new_glyph);

	return new_glyph.sprite;
}

/* virtual */ GlyphID Win32FontCache::MapCharToGlyph(WChar key)
{
	assert(IsPrintable(key));

	if (key >= SCC_SPRITE_START && key <= SCC_SPRITE_END) {
		return this->parent->MapCharToGlyph(key);
	}

	/* Convert characters outside of the BMP into surrogate pairs. */
	WCHAR chars[2];
	if (key >= 0x010000U) {
		chars[0] = (wchar_t)(((key - 0x010000U) >> 10) + 0xD800);
		chars[1] = (wchar_t)(((key - 0x010000U) & 0x3FF) + 0xDC00);
	} else {
		chars[0] = (wchar_t)(key & 0xFFFF);
	}

	WORD glyphs[2] = { 0, 0 };
	GetGlyphIndicesW(this->dc, chars, key >= 0x010000U ? 2 : 1, glyphs, GGI_MARK_NONEXISTING_GLYPHS);

	return glyphs[0] != 0xFFFF ? glyphs[0] : 0;
}

/* virtual */ const void *Win32FontCache::InternalGetFontTable(uint32 tag, size_t &length)
{
	DWORD len = GetFontData(this->dc, tag, 0, nullptr, 0);

	void *result = nullptr;
	if (len != GDI_ERROR && len > 0) {
		result = MallocT<BYTE>(len);
		GetFontData(this->dc, tag, 0, result, len);
	}

	length = len;
	return result;
}


/**
 * Loads the GDI font.
 * If a GDI font description is present, e.g. from the automatic font
 * fallback search, use it. Otherwise, try to resolve it by font name.
 * @param fs The font size to load.
 */
void LoadWin32Font(FontSize fs)
{
	static const char *SIZE_TO_NAME[] = { "medium", "small", "large", "mono" };

	FreeTypeSubSetting *settings = nullptr;
	switch (fs) {
		case FS_SMALL:  settings = &_freetype.small;  break;
		case FS_NORMAL: settings = &_freetype.medium; break;
		case FS_LARGE:  settings = &_freetype.large;  break;
		case FS_MONO:   settings = &_freetype.mono;   break;
		default: NOT_REACHED();
	}

	if (StrEmpty(settings->font)) return;

	LOGFONT logfont;
	MemSetT(&logfont, 0);
	logfont.lfPitchAndFamily = fs == FS_MONO ? FIXED_PITCH : VARIABLE_PITCH;
	logfont.lfCharSet = DEFAULT_CHARSET;
	logfont.lfOutPrecision = OUT_OUTLINE_PRECIS;
	logfont.lfClipPrecision = CLIP_DEFAULT_PRECIS;

	if (settings->os_handle != nullptr) {
		logfont = *(const LOGFONT *)settings->os_handle;
	} else if (strchr(settings->font, '.') != nullptr) {
		/* Might be a font file name, try load it. */

		wchar_t fontPath[MAX_PATH] = {};

		/* See if this is an absolute path. */
		if (FileExists(settings->font)) {
			convert_to_fs(settings->font, fontPath, lengthof(fontPath));
		} else {
			/* Scan the search-paths to see if it can be found. */
			std::string full_font = FioFindFullPath(BASE_DIR, settings->font);
			if (!full_font.empty()) {
				convert_to_fs(full_font.c_str(), fontPath, lengthof(fontPath));
			}
		}

		if (fontPath[0] != 0) {
			if (AddFontResourceEx(fontPath, FR_PRIVATE, 0) != 0) {
				/* Try a nice little undocumented function first for getting the internal font name.
				 * Some documentation is found at: http://www.undocprint.org/winspool/getfontresourceinfo */
				typedef BOOL(WINAPI *PFNGETFONTRESOURCEINFO)(LPCTSTR, LPDWORD, LPVOID, DWORD);
				static PFNGETFONTRESOURCEINFO GetFontResourceInfo = (PFNGETFONTRESOURCEINFO)GetProcAddress(GetModuleHandle(L"Gdi32"), "GetFontResourceInfoW");

				if (GetFontResourceInfo != nullptr) {
					/* Try to query an array of LOGFONTs that describe the file. */
					DWORD len = 0;
					if (GetFontResourceInfo(fontPath, &len, nullptr, 2) && len >= sizeof(LOGFONT)) {
						LOGFONT *buf = (LOGFONT *)AllocaM(byte, len);
						if (GetFontResourceInfo(fontPath, &len, buf, 2)) {
							logfont = *buf; // Just use first entry.
						}
					}
				}

				/* No dice yet. Use the file name as the font face name, hoping it matches. */
				if (logfont.lfFaceName[0] == 0) {
					wchar_t fname[_MAX_FNAME];
					_wsplitpath(fontPath, nullptr, nullptr, fname, nullptr);

					wcsncpy_s(logfont.lfFaceName, lengthof(logfont.lfFaceName), fname, _TRUNCATE);
					logfont.lfWeight = strcasestr(settings->font, " bold") != nullptr || strcasestr(settings->font, "-bold") != nullptr ? FW_BOLD : FW_NORMAL; // Poor man's way to allow selecting bold fonts.
				}
			} else {
				ShowInfoF("Unable to load file '%s' for %s font, using default windows font selection instead", settings->font, SIZE_TO_NAME[fs]);
			}
		}
	}

	if (logfont.lfFaceName[0] == 0) {
		logfont.lfWeight = strcasestr(settings->font, " bold") != nullptr ? FW_BOLD : FW_NORMAL; // Poor man's way to allow selecting bold fonts.
		convert_to_fs(settings->font, logfont.lfFaceName, lengthof(logfont.lfFaceName));
	}

	HFONT font = CreateFontIndirect(&logfont);
	if (font == nullptr) {
		ShowInfoF("Unable to use '%s' for %s font, Win32 reported error 0x%lX, using sprite font instead", settings->font, SIZE_TO_NAME[fs], GetLastError());
		return;
	}
	DeleteObject(font);

	new Win32FontCache(fs, logfont, settings->size);
}