Learn how easy it is to sync an existing GitHub or Google Code repo to a SourceForge project! See Demo

Close

[a9f0b0]: gfx / thebes / gfxGDIFont.cpp Maximize Restore History

Download this file

gfxGDIFont.cpp    579 lines (501 with data), 21.0 kB

  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
/* -*- Mode: C++; tab-width: 20; indent-tabs-mode: nil; c-basic-offset: 4 -*-
* This Source Code Form is subject to the terms of the Mozilla Public
* License, v. 2.0. If a copy of the MPL was not distributed with this
* file, You can obtain one at http://mozilla.org/MPL/2.0/. */
#include "gfxGDIFont.h"
#include "gfxGDIShaper.h"
#include "gfxUniscribeShaper.h"
#include "gfxHarfBuzzShaper.h"
#include <algorithm>
#include "gfxGraphiteShaper.h"
#include "gfxWindowsPlatform.h"
#include "gfxContext.h"
#include "mozilla/Preferences.h"
#include "nsUnicodeProperties.h"
#include "cairo-win32.h"
#define ROUND(x) floor((x) + 0.5)
using namespace mozilla;
using namespace mozilla::unicode;
static inline cairo_antialias_t
GetCairoAntialiasOption(gfxFont::AntialiasOption anAntialiasOption)
{
switch (anAntialiasOption) {
default:
case gfxFont::kAntialiasDefault:
return CAIRO_ANTIALIAS_DEFAULT;
case gfxFont::kAntialiasNone:
return CAIRO_ANTIALIAS_NONE;
case gfxFont::kAntialiasGrayscale:
return CAIRO_ANTIALIAS_GRAY;
case gfxFont::kAntialiasSubpixel:
return CAIRO_ANTIALIAS_SUBPIXEL;
}
}
gfxGDIFont::gfxGDIFont(GDIFontEntry *aFontEntry,
const gfxFontStyle *aFontStyle,
bool aNeedsBold,
AntialiasOption anAAOption)
: gfxFont(aFontEntry, aFontStyle, anAAOption),
mFont(NULL),
mFontFace(nullptr),
mMetrics(nullptr),
mSpaceGlyph(0),
mNeedsBold(aNeedsBold)
{
if (FontCanSupportGraphite()) {
mGraphiteShaper = new gfxGraphiteShaper(this);
}
if (FontCanSupportHarfBuzz()) {
mHarfBuzzShaper = new gfxHarfBuzzShaper(this);
}
}
gfxGDIFont::~gfxGDIFont()
{
if (mScaledFont) {
cairo_scaled_font_destroy(mScaledFont);
}
if (mFontFace) {
cairo_font_face_destroy(mFontFace);
}
if (mFont) {
::DeleteObject(mFont);
}
delete mMetrics;
}
void
gfxGDIFont::CreatePlatformShaper()
{
mPlatformShaper = new gfxGDIShaper(this);
}
gfxFont*
gfxGDIFont::CopyWithAntialiasOption(AntialiasOption anAAOption)
{
return new gfxGDIFont(static_cast<GDIFontEntry*>(mFontEntry.get()),
&mStyle, mNeedsBold, anAAOption);
}
static bool
UseUniscribe(gfxShapedText *aShapedText,
const PRUnichar *aText,
uint32_t aLength)
{
uint32_t flags = aShapedText->Flags();
bool useGDI;
bool isXP = (gfxWindowsPlatform::WindowsOSVersion()
< gfxWindowsPlatform::kWindowsVista);
// bug 561304 - Uniscribe bug produces bad positioning at certain
// font sizes on XP, so default to GDI on XP using logic of 3.6
useGDI = isXP &&
(flags &
(gfxTextRunFactory::TEXT_OPTIMIZE_SPEED |
gfxTextRunFactory::TEXT_IS_RTL)
) == gfxTextRunFactory::TEXT_OPTIMIZE_SPEED;
return !useGDI ||
ScriptIsComplex(aText, aLength, SIC_COMPLEX) == S_OK;
}
bool
gfxGDIFont::ShapeText(gfxContext *aContext,
const PRUnichar *aText,
uint32_t aOffset,
uint32_t aLength,
int32_t aScript,
gfxShapedText *aShapedText,
bool aPreferPlatformShaping)
{
if (!mMetrics) {
Initialize();
}
if (!mIsValid) {
NS_WARNING("invalid font! expect incorrect text rendering");
return false;
}
bool ok = false;
// Ensure the cairo font is set up, so there's no risk it'll fall back to
// creating a "toy" font internally (see bug 544617).
// We must check that this succeeded, otherwise we risk cairo creating the
// wrong kind of font internally as a fallback (bug 744480).
if (!SetupCairoFont(aContext)) {
return false;
}
if (mGraphiteShaper && gfxPlatform::GetPlatform()->UseGraphiteShaping()) {
ok = mGraphiteShaper->ShapeText(aContext, aText,
aOffset, aLength,
aScript, aShapedText);
}
if (!ok && mHarfBuzzShaper) {
if (gfxPlatform::GetPlatform()->UseHarfBuzzForScript(aScript) ||
(gfxWindowsPlatform::WindowsOSVersion() <
gfxWindowsPlatform::kWindowsVista &&
ScriptShapingType(aScript) == SHAPING_INDIC &&
!Preferences::GetBool("gfx.font_rendering.winxp-indic-uniscribe",
false))) {
ok = mHarfBuzzShaper->ShapeText(aContext, aText, aOffset, aLength,
aScript, aShapedText);
}
}
if (!ok) {
GDIFontEntry *fe = static_cast<GDIFontEntry*>(GetFontEntry());
bool preferUniscribe =
(!fe->IsTrueType() || fe->IsSymbolFont()) && !fe->mForceGDI;
if (preferUniscribe || UseUniscribe(aShapedText, aText, aLength)) {
// first try Uniscribe
if (!mUniscribeShaper) {
mUniscribeShaper = new gfxUniscribeShaper(this);
}
ok = mUniscribeShaper->ShapeText(aContext, aText, aOffset, aLength,
aScript, aShapedText);
if (!ok) {
// fallback to GDI shaping
if (!mPlatformShaper) {
CreatePlatformShaper();
}
ok = mPlatformShaper->ShapeText(aContext, aText, aOffset,
aLength, aScript, aShapedText);
}
} else {
// first use GDI
if (!mPlatformShaper) {
CreatePlatformShaper();
}
ok = mPlatformShaper->ShapeText(aContext, aText, aOffset, aLength,
aScript, aShapedText);
if (!ok) {
// try Uniscribe if GDI failed
if (!mUniscribeShaper) {
mUniscribeShaper = new gfxUniscribeShaper(this);
}
// use Uniscribe shaping
ok = mUniscribeShaper->ShapeText(aContext, aText,
aOffset, aLength,
aScript, aShapedText);
}
}
#if DEBUG
if (!ok) {
NS_ConvertUTF16toUTF8 name(GetName());
char msg[256];
sprintf(msg,
"text shaping with both uniscribe and GDI failed for"
" font: %s",
name.get());
NS_WARNING(msg);
}
#endif
}
PostShapingFixup(aContext, aText, aOffset, aLength, aShapedText);
return ok;
}
const gfxFont::Metrics&
gfxGDIFont::GetMetrics()
{
if (!mMetrics) {
Initialize();
}
return *mMetrics;
}
uint32_t
gfxGDIFont::GetSpaceGlyph()
{
if (!mMetrics) {
Initialize();
}
return mSpaceGlyph;
}
bool
gfxGDIFont::SetupCairoFont(gfxContext *aContext)
{
if (!mMetrics) {
Initialize();
}
if (!mScaledFont ||
cairo_scaled_font_status(mScaledFont) != CAIRO_STATUS_SUCCESS) {
// Don't cairo_set_scaled_font as that would propagate the error to
// the cairo_t, precluding any further drawing.
return false;
}
cairo_set_scaled_font(aContext->GetCairo(), mScaledFont);
return true;
}
gfxFont::RunMetrics
gfxGDIFont::Measure(gfxTextRun *aTextRun,
uint32_t aStart, uint32_t aEnd,
BoundingBoxType aBoundingBoxType,
gfxContext *aRefContext,
Spacing *aSpacing)
{
gfxFont::RunMetrics metrics =
gfxFont::Measure(aTextRun, aStart, aEnd,
aBoundingBoxType, aRefContext, aSpacing);
// if aBoundingBoxType is LOOSE_INK_EXTENTS
// and the underlying cairo font may be antialiased,
// we can't trust Windows to have considered all the pixels
// so we need to add "padding" to the bounds.
// (see bugs 475968, 439831, compare also bug 445087)
if (aBoundingBoxType == LOOSE_INK_EXTENTS &&
mAntialiasOption != kAntialiasNone &&
metrics.mBoundingBox.width > 0) {
metrics.mBoundingBox.x -= aTextRun->GetAppUnitsPerDevUnit();
metrics.mBoundingBox.width += aTextRun->GetAppUnitsPerDevUnit() * 3;
}
return metrics;
}
#define OBLIQUE_SKEW_FACTOR 0.3
void
gfxGDIFont::Initialize()
{
NS_ASSERTION(!mMetrics, "re-creating metrics? this will leak");
LOGFONTW logFont;
// Figure out if we want to do synthetic oblique styling.
GDIFontEntry* fe = static_cast<GDIFontEntry*>(GetFontEntry());
bool wantFakeItalic =
(mStyle.style & (NS_FONT_STYLE_ITALIC | NS_FONT_STYLE_OBLIQUE)) &&
!fe->IsItalic();
// If the font's family has an actual italic face (but font matching
// didn't choose it), we have to use a cairo transform instead of asking
// GDI to italicize, because that would use a different face and result
// in a possible glyph ID mismatch between shaping and rendering.
//
// We use the mFamilyHasItalicFace flag in the entry in case of user fonts,
// where the *CSS* family may not know about italic faces that are present
// in the *GDI* family, and which GDI would use if we asked it to perform
// the "italicization".
bool useCairoFakeItalic = wantFakeItalic && fe->mFamilyHasItalicFace;
if (mAdjustedSize == 0.0) {
mAdjustedSize = mStyle.size;
if (mStyle.sizeAdjust != 0.0 && mAdjustedSize > 0.0) {
// to implement font-size-adjust, we first create the "unadjusted" font
FillLogFont(logFont, mAdjustedSize,
wantFakeItalic && !useCairoFakeItalic);
mFont = ::CreateFontIndirectW(&logFont);
// initialize its metrics so we can calculate size adjustment
Initialize();
// calculate the properly adjusted size, and then proceed
// to recreate mFont and recalculate metrics
gfxFloat aspect = mMetrics->xHeight / mMetrics->emHeight;
mAdjustedSize = mStyle.GetAdjustedSize(aspect);
// delete the temporary font and metrics
::DeleteObject(mFont);
mFont = nullptr;
delete mMetrics;
mMetrics = nullptr;
}
}
// (bug 724231) for local user fonts, we don't use GDI's synthetic bold,
// as it could lead to a different, incompatible face being used
// but instead do our own multi-striking
if (mNeedsBold && GetFontEntry()->IsLocalUserFont()) {
mApplySyntheticBold = true;
}
// this may end up being zero
mAdjustedSize = ROUND(mAdjustedSize);
FillLogFont(logFont, mAdjustedSize, wantFakeItalic && !useCairoFakeItalic);
mFont = ::CreateFontIndirectW(&logFont);
mMetrics = new gfxFont::Metrics;
::memset(mMetrics, 0, sizeof(*mMetrics));
AutoDC dc;
SetGraphicsMode(dc.GetDC(), GM_ADVANCED);
AutoSelectFont selectFont(dc.GetDC(), mFont);
// Get font metrics if size > 0
if (mAdjustedSize > 0.0) {
OUTLINETEXTMETRIC oMetrics;
TEXTMETRIC& metrics = oMetrics.otmTextMetrics;
if (0 < GetOutlineTextMetrics(dc.GetDC(), sizeof(oMetrics), &oMetrics)) {
mMetrics->superscriptOffset = (double)oMetrics.otmptSuperscriptOffset.y;
// Some fonts have wrong sign on their subscript offset, bug 410917.
mMetrics->subscriptOffset = fabs((double)oMetrics.otmptSubscriptOffset.y);
mMetrics->strikeoutSize = (double)oMetrics.otmsStrikeoutSize;
mMetrics->strikeoutOffset = (double)oMetrics.otmsStrikeoutPosition;
mMetrics->underlineSize = (double)oMetrics.otmsUnderscoreSize;
mMetrics->underlineOffset = (double)oMetrics.otmsUnderscorePosition;
const MAT2 kIdentityMatrix = { {0, 1}, {0, 0}, {0, 0}, {0, 1} };
GLYPHMETRICS gm;
DWORD len = GetGlyphOutlineW(dc.GetDC(), PRUnichar('x'), GGO_METRICS, &gm, 0, nullptr, &kIdentityMatrix);
if (len == GDI_ERROR || gm.gmptGlyphOrigin.y <= 0) {
// 56% of ascent, best guess for true type
mMetrics->xHeight =
ROUND((double)metrics.tmAscent * DEFAULT_XHEIGHT_FACTOR);
} else {
mMetrics->xHeight = gm.gmptGlyphOrigin.y;
}
mMetrics->emHeight = metrics.tmHeight - metrics.tmInternalLeading;
gfxFloat typEmHeight = (double)oMetrics.otmAscent - (double)oMetrics.otmDescent;
mMetrics->emAscent = ROUND(mMetrics->emHeight * (double)oMetrics.otmAscent / typEmHeight);
mMetrics->emDescent = mMetrics->emHeight - mMetrics->emAscent;
if (oMetrics.otmEMSquare > 0) {
mFUnitsConvFactor = float(mAdjustedSize / oMetrics.otmEMSquare);
}
} else {
// Make a best-effort guess at extended metrics
// this is based on general typographic guidelines
// GetTextMetrics can fail if the font file has been removed
// or corrupted recently.
BOOL result = GetTextMetrics(dc.GetDC(), &metrics);
if (!result) {
NS_WARNING("Missing or corrupt font data, fasten your seatbelt");
mIsValid = false;
memset(mMetrics, 0, sizeof(*mMetrics));
return;
}
mMetrics->xHeight =
ROUND((float)metrics.tmAscent * DEFAULT_XHEIGHT_FACTOR);
mMetrics->superscriptOffset = mMetrics->xHeight;
mMetrics->subscriptOffset = mMetrics->xHeight;
mMetrics->strikeoutSize = 1;
mMetrics->strikeoutOffset = ROUND(mMetrics->xHeight * 0.5f); // 50% of xHeight
mMetrics->underlineSize = 1;
mMetrics->underlineOffset = -ROUND((float)metrics.tmDescent * 0.30f); // 30% of descent
mMetrics->emHeight = metrics.tmHeight - metrics.tmInternalLeading;
mMetrics->emAscent = metrics.tmAscent - metrics.tmInternalLeading;
mMetrics->emDescent = metrics.tmDescent;
}
mMetrics->internalLeading = metrics.tmInternalLeading;
mMetrics->externalLeading = metrics.tmExternalLeading;
mMetrics->maxHeight = metrics.tmHeight;
mMetrics->maxAscent = metrics.tmAscent;
mMetrics->maxDescent = metrics.tmDescent;
mMetrics->maxAdvance = metrics.tmMaxCharWidth;
mMetrics->aveCharWidth = std::max<gfxFloat>(1, metrics.tmAveCharWidth);
// The font is monospace when TMPF_FIXED_PITCH is *not* set!
// See http://msdn2.microsoft.com/en-us/library/ms534202(VS.85).aspx
if (!(metrics.tmPitchAndFamily & TMPF_FIXED_PITCH)) {
mMetrics->maxAdvance = mMetrics->aveCharWidth;
}
// Cache the width of a single space.
SIZE size;
GetTextExtentPoint32W(dc.GetDC(), L" ", 1, &size);
mMetrics->spaceWidth = ROUND(size.cx);
// Cache the width of digit zero.
// XXX MSDN (http://msdn.microsoft.com/en-us/library/ms534223.aspx)
// does not say what the failure modes for GetTextExtentPoint32 are -
// is it safe to assume it will fail iff the font has no '0'?
if (GetTextExtentPoint32W(dc.GetDC(), L"0", 1, &size)) {
mMetrics->zeroOrAveCharWidth = ROUND(size.cx);
} else {
mMetrics->zeroOrAveCharWidth = mMetrics->aveCharWidth;
}
WORD glyph;
DWORD ret = GetGlyphIndicesW(dc.GetDC(), L" ", 1, &glyph,
GGI_MARK_NONEXISTING_GLYPHS);
if (ret != GDI_ERROR && glyph != 0xFFFF) {
mSpaceGlyph = glyph;
}
SanitizeMetrics(mMetrics, GetFontEntry()->mIsBadUnderlineFont);
}
if (IsSyntheticBold()) {
mMetrics->aveCharWidth += GetSyntheticBoldOffset();
mMetrics->maxAdvance += GetSyntheticBoldOffset();
}
mFontFace = cairo_win32_font_face_create_for_logfontw_hfont(&logFont,
mFont);
cairo_matrix_t sizeMatrix, ctm;
cairo_matrix_init_identity(&ctm);
cairo_matrix_init_scale(&sizeMatrix, mAdjustedSize, mAdjustedSize);
if (useCairoFakeItalic) {
// Skew the matrix to do fake italic if it wasn't already applied
// via the LOGFONT
double skewfactor = OBLIQUE_SKEW_FACTOR;
cairo_matrix_t style;
cairo_matrix_init(&style,
1, //xx
0, //yx
-1 * skewfactor, //xy
1, //yy
0, //x0
0); //y0
cairo_matrix_multiply(&sizeMatrix, &sizeMatrix, &style);
}
cairo_font_options_t *fontOptions = cairo_font_options_create();
if (mAntialiasOption != kAntialiasDefault) {
cairo_font_options_set_antialias(fontOptions,
GetCairoAntialiasOption(mAntialiasOption));
}
mScaledFont = cairo_scaled_font_create(mFontFace, &sizeMatrix,
&ctm, fontOptions);
cairo_font_options_destroy(fontOptions);
if (!mScaledFont ||
cairo_scaled_font_status(mScaledFont) != CAIRO_STATUS_SUCCESS) {
#ifdef DEBUG
char warnBuf[1024];
sprintf(warnBuf, "Failed to create scaled font: %s status: %d",
NS_ConvertUTF16toUTF8(mFontEntry->Name()).get(),
mScaledFont ? cairo_scaled_font_status(mScaledFont) : 0);
NS_WARNING(warnBuf);
#endif
mIsValid = false;
} else {
mIsValid = true;
}
#if 0
printf("Font: %p (%s) size: %f adjusted size: %f valid: %s\n", this,
NS_ConvertUTF16toUTF8(GetName()).get(), mStyle.size, mAdjustedSize, (mIsValid ? "yes" : "no"));
printf(" emHeight: %f emAscent: %f emDescent: %f\n", mMetrics->emHeight, mMetrics->emAscent, mMetrics->emDescent);
printf(" maxAscent: %f maxDescent: %f maxAdvance: %f\n", mMetrics->maxAscent, mMetrics->maxDescent, mMetrics->maxAdvance);
printf(" internalLeading: %f externalLeading: %f\n", mMetrics->internalLeading, mMetrics->externalLeading);
printf(" spaceWidth: %f aveCharWidth: %f xHeight: %f\n", mMetrics->spaceWidth, mMetrics->aveCharWidth, mMetrics->xHeight);
printf(" uOff: %f uSize: %f stOff: %f stSize: %f supOff: %f subOff: %f\n",
mMetrics->underlineOffset, mMetrics->underlineSize, mMetrics->strikeoutOffset, mMetrics->strikeoutSize,
mMetrics->superscriptOffset, mMetrics->subscriptOffset);
#endif
}
void
gfxGDIFont::FillLogFont(LOGFONTW& aLogFont, gfxFloat aSize,
bool aUseGDIFakeItalic)
{
GDIFontEntry *fe = static_cast<GDIFontEntry*>(GetFontEntry());
uint16_t weight;
if (fe->IsUserFont()) {
if (fe->IsLocalUserFont()) {
// for local user fonts, don't change the original weight
// in the entry's logfont, because that could alter the
// choice of actual face used (bug 724231)
weight = 0;
} else {
// avoid GDI synthetic bold which occurs when weight
// specified is >= font data weight + 200
weight = mNeedsBold ? 700 : 200;
}
} else {
weight = mNeedsBold ? 700 : fe->Weight();
}
fe->FillLogFont(&aLogFont, weight, aSize,
(mAntialiasOption == kAntialiasSubpixel) ? true : false);
// If GDI synthetic italic is wanted, force the lfItalic field to true
if (aUseGDIFakeItalic) {
aLogFont.lfItalic = 1;
}
}
int32_t
gfxGDIFont::GetGlyphWidth(gfxContext *aCtx, uint16_t aGID)
{
if (!mGlyphWidths.IsInitialized()) {
mGlyphWidths.Init(200);
}
int32_t width;
if (mGlyphWidths.Get(aGID, &width)) {
return width;
}
DCFromContext dc(aCtx);
AutoSelectFont fs(dc, GetHFONT());
int devWidth;
if (GetCharWidthI(dc, aGID, 1, NULL, &devWidth)) {
// ensure width is positive, 16.16 fixed-point value
width = (devWidth & 0x7fff) << 16;
mGlyphWidths.Put(aGID, width);
return width;
}
return -1;
}
void
gfxGDIFont::SizeOfExcludingThis(nsMallocSizeOfFun aMallocSizeOf,
FontCacheSizes* aSizes) const
{
gfxFont::SizeOfExcludingThis(aMallocSizeOf, aSizes);
aSizes->mFontInstances += aMallocSizeOf(mMetrics) +
mGlyphWidths.SizeOfExcludingThis(nullptr, aMallocSizeOf);
}
void
gfxGDIFont::SizeOfIncludingThis(nsMallocSizeOfFun aMallocSizeOf,
FontCacheSizes* aSizes) const
{
aSizes->mFontInstances += aMallocSizeOf(this);
SizeOfExcludingThis(aMallocSizeOf, aSizes);
}