gfx/thebes/gfxDWriteFonts.cpp@97036ab72558
gfx/thebes/gfxDWriteFonts.cpp
Tue, 06 Jan 2015 21:39:09 +0100
- author
- Michael Schloh von Bennewitz <michael@schloh.com>
- date
- Tue, 06 Jan 2015 21:39:09 +0100
- branch
- TOR_BUG_9701
- changeset 8
- 97036ab72558
- permissions
- -rw-r--r--
Conditionally force memory storage according to privacy.thirdparty.isolate;
This solves Tor bug #9701, complying with disk avoidance documented in
https://www.torproject.org/projects/torbrowser/design/#disk-avoidance.
1 /* -*- Mode: C++; tab-width: 20; indent-tabs-mode: nil; c-basic-offset: 4 -*-
2 * This Source Code Form is subject to the terms of the Mozilla Public
3 * License, v. 2.0. If a copy of the MPL was not distributed with this
4 * file, You can obtain one at http://mozilla.org/MPL/2.0/. */
6 #include "gfxDWriteFonts.h"
8 #include "mozilla/MemoryReporting.h"
10 #include "gfxDWriteShaper.h"
11 #include "gfxHarfBuzzShaper.h"
12 #include <algorithm>
13 #include "gfxGraphiteShaper.h"
14 #include "gfxDWriteFontList.h"
15 #include "gfxContext.h"
16 #include <dwrite.h>
18 #include "gfxDWriteTextAnalysis.h"
20 #include "harfbuzz/hb.h"
22 // Chosen this as to resemble DWrite's own oblique face style.
23 #define OBLIQUE_SKEW_FACTOR 0.3
25 using namespace mozilla;
26 using namespace mozilla::gfx;
28 // This is also in gfxGDIFont.cpp. Would be nice to put it somewhere common,
29 // but we can't declare it in the gfxFont.h or gfxFontUtils.h headers
30 // because those are exported, and the cairo headers aren't.
31 static inline cairo_antialias_t
32 GetCairoAntialiasOption(gfxFont::AntialiasOption anAntialiasOption)
33 {
34 switch (anAntialiasOption) {
35 default:
36 case gfxFont::kAntialiasDefault:
37 return CAIRO_ANTIALIAS_DEFAULT;
38 case gfxFont::kAntialiasNone:
39 return CAIRO_ANTIALIAS_NONE;
40 case gfxFont::kAntialiasGrayscale:
41 return CAIRO_ANTIALIAS_GRAY;
42 case gfxFont::kAntialiasSubpixel:
43 return CAIRO_ANTIALIAS_SUBPIXEL;
44 }
45 }
47 // Code to determine whether Windows is set to use ClearType font smoothing;
48 // based on private functions in cairo-win32-font.c
50 #ifndef SPI_GETFONTSMOOTHINGTYPE
51 #define SPI_GETFONTSMOOTHINGTYPE 0x200a
52 #endif
53 #ifndef FE_FONTSMOOTHINGCLEARTYPE
54 #define FE_FONTSMOOTHINGCLEARTYPE 2
55 #endif
57 static bool
58 UsingClearType()
59 {
60 BOOL fontSmoothing;
61 if (!SystemParametersInfo(SPI_GETFONTSMOOTHING, 0, &fontSmoothing, 0) ||
62 !fontSmoothing)
63 {
64 return false;
65 }
67 UINT type;
68 if (SystemParametersInfo(SPI_GETFONTSMOOTHINGTYPE, 0, &type, 0) &&
69 type == FE_FONTSMOOTHINGCLEARTYPE)
70 {
71 return true;
72 }
73 return false;
74 }
76 ////////////////////////////////////////////////////////////////////////////////
77 // gfxDWriteFont
78 gfxDWriteFont::gfxDWriteFont(gfxFontEntry *aFontEntry,
79 const gfxFontStyle *aFontStyle,
80 bool aNeedsBold,
81 AntialiasOption anAAOption)
82 : gfxFont(aFontEntry, aFontStyle, anAAOption)
83 , mCairoFontFace(nullptr)
84 , mMetrics(nullptr)
85 , mNeedsOblique(false)
86 , mNeedsBold(aNeedsBold)
87 , mUseSubpixelPositions(false)
88 , mAllowManualShowGlyphs(true)
89 {
90 gfxDWriteFontEntry *fe =
91 static_cast<gfxDWriteFontEntry*>(aFontEntry);
92 nsresult rv;
93 DWRITE_FONT_SIMULATIONS sims = DWRITE_FONT_SIMULATIONS_NONE;
94 if ((GetStyle()->style & (NS_FONT_STYLE_ITALIC | NS_FONT_STYLE_OBLIQUE)) &&
95 !fe->IsItalic()) {
96 // For this we always use the font_matrix for uniformity. Not the
97 // DWrite simulation.
98 mNeedsOblique = true;
99 }
100 if (aNeedsBold) {
101 sims |= DWRITE_FONT_SIMULATIONS_BOLD;
102 }
104 rv = fe->CreateFontFace(getter_AddRefs(mFontFace), sims);
106 if (NS_FAILED(rv)) {
107 mIsValid = false;
108 return;
109 }
111 ComputeMetrics(anAAOption);
113 if (FontCanSupportGraphite()) {
114 mGraphiteShaper = new gfxGraphiteShaper(this);
115 }
117 if (FontCanSupportHarfBuzz()) {
118 mHarfBuzzShaper = new gfxHarfBuzzShaper(this);
119 }
120 }
122 gfxDWriteFont::~gfxDWriteFont()
123 {
124 if (mCairoFontFace) {
125 cairo_font_face_destroy(mCairoFontFace);
126 }
127 if (mScaledFont) {
128 cairo_scaled_font_destroy(mScaledFont);
129 }
130 delete mMetrics;
131 }
133 gfxFont*
134 gfxDWriteFont::CopyWithAntialiasOption(AntialiasOption anAAOption)
135 {
136 return new gfxDWriteFont(static_cast<gfxDWriteFontEntry*>(mFontEntry.get()),
137 &mStyle, mNeedsBold, anAAOption);
138 }
140 void
141 gfxDWriteFont::CreatePlatformShaper()
142 {
143 mPlatformShaper = new gfxDWriteShaper(this);
144 }
146 const gfxFont::Metrics&
147 gfxDWriteFont::GetMetrics()
148 {
149 return *mMetrics;
150 }
152 bool
153 gfxDWriteFont::GetFakeMetricsForArialBlack(DWRITE_FONT_METRICS *aFontMetrics)
154 {
155 gfxFontStyle style(mStyle);
156 style.weight = 700;
157 bool needsBold;
159 gfxFontEntry* fe =
160 gfxPlatformFontList::PlatformFontList()->
161 FindFontForFamily(NS_LITERAL_STRING("Arial"), &style, needsBold);
162 if (!fe || fe == mFontEntry) {
163 return false;
164 }
166 nsRefPtr<gfxFont> font = fe->FindOrMakeFont(&style, needsBold);
167 gfxDWriteFont *dwFont = static_cast<gfxDWriteFont*>(font.get());
168 dwFont->mFontFace->GetMetrics(aFontMetrics);
170 return true;
171 }
173 void
174 gfxDWriteFont::ComputeMetrics(AntialiasOption anAAOption)
175 {
176 DWRITE_FONT_METRICS fontMetrics;
177 if (!(mFontEntry->Weight() == 900 &&
178 !mFontEntry->IsUserFont() &&
179 mFontEntry->Name().EqualsLiteral("Arial Black") &&
180 GetFakeMetricsForArialBlack(&fontMetrics)))
181 {
182 mFontFace->GetMetrics(&fontMetrics);
183 }
185 if (mStyle.sizeAdjust != 0.0) {
186 gfxFloat aspect = (gfxFloat)fontMetrics.xHeight /
187 fontMetrics.designUnitsPerEm;
188 mAdjustedSize = mStyle.GetAdjustedSize(aspect);
189 } else {
190 mAdjustedSize = mStyle.size;
191 }
193 // Note that GetMeasuringMode depends on mAdjustedSize
194 if ((anAAOption == gfxFont::kAntialiasDefault &&
195 UsingClearType() &&
196 GetMeasuringMode() == DWRITE_MEASURING_MODE_NATURAL) ||
197 anAAOption == gfxFont::kAntialiasSubpixel)
198 {
199 mUseSubpixelPositions = true;
200 // note that this may be reset to FALSE if we determine that a bitmap
201 // strike is going to be used
202 }
204 gfxDWriteFontEntry *fe =
205 static_cast<gfxDWriteFontEntry*>(mFontEntry.get());
206 if (fe->IsCJKFont() && HasBitmapStrikeForSize(NS_lround(mAdjustedSize))) {
207 mAdjustedSize = NS_lround(mAdjustedSize);
208 mUseSubpixelPositions = false;
209 // if we have bitmaps, we need to tell Cairo NOT to use subpixel AA,
210 // to avoid the manual-subpixel codepath in cairo-d2d-surface.cpp
211 // which fails to render bitmap glyphs (see bug 626299).
212 // This option will be passed to the cairo_dwrite_scaled_font_t
213 // after creation.
214 mAllowManualShowGlyphs = false;
215 }
217 mMetrics = new gfxFont::Metrics;
218 ::memset(mMetrics, 0, sizeof(*mMetrics));
220 mFUnitsConvFactor = float(mAdjustedSize / fontMetrics.designUnitsPerEm);
222 mMetrics->xHeight = fontMetrics.xHeight * mFUnitsConvFactor;
224 mMetrics->maxAscent = ceil(fontMetrics.ascent * mFUnitsConvFactor);
225 mMetrics->maxDescent = ceil(fontMetrics.descent * mFUnitsConvFactor);
226 mMetrics->maxHeight = mMetrics->maxAscent + mMetrics->maxDescent;
228 mMetrics->emHeight = mAdjustedSize;
229 mMetrics->emAscent = mMetrics->emHeight *
230 mMetrics->maxAscent / mMetrics->maxHeight;
231 mMetrics->emDescent = mMetrics->emHeight - mMetrics->emAscent;
233 mMetrics->maxAdvance = mAdjustedSize;
235 // try to get the true maxAdvance value from 'hhea'
236 gfxFontEntry::AutoTable hheaTable(GetFontEntry(),
237 TRUETYPE_TAG('h','h','e','a'));
238 if (hheaTable) {
239 uint32_t len;
240 const HheaTable* hhea =
241 reinterpret_cast<const HheaTable*>(hb_blob_get_data(hheaTable, &len));
242 if (len >= sizeof(HheaTable)) {
243 mMetrics->maxAdvance =
244 uint16_t(hhea->advanceWidthMax) * mFUnitsConvFactor;
245 }
246 }
248 mMetrics->internalLeading = std::max(mMetrics->maxHeight - mMetrics->emHeight, 0.0);
249 mMetrics->externalLeading = ceil(fontMetrics.lineGap * mFUnitsConvFactor);
251 UINT16 glyph = (uint16_t)GetSpaceGlyph();
252 mMetrics->spaceWidth = MeasureGlyphWidth(glyph);
254 // try to get aveCharWidth from the OS/2 table, fall back to measuring 'x'
255 // if the table is not available or if using hinted/pixel-snapped widths
256 if (mUseSubpixelPositions) {
257 mMetrics->aveCharWidth = 0;
258 gfxFontEntry::AutoTable os2Table(GetFontEntry(),
259 TRUETYPE_TAG('O','S','/','2'));
260 if (os2Table) {
261 uint32_t len;
262 const OS2Table* os2 =
263 reinterpret_cast<const OS2Table*>(hb_blob_get_data(os2Table, &len));
264 if (len >= 4) {
265 // Not checking against sizeof(mozilla::OS2Table) here because older
266 // versions of the table have different sizes; we only need the first
267 // two 16-bit fields here.
268 mMetrics->aveCharWidth =
269 int16_t(os2->xAvgCharWidth) * mFUnitsConvFactor;
270 }
271 }
272 }
274 UINT32 ucs;
275 if (mMetrics->aveCharWidth < 1) {
276 ucs = L'x';
277 if (SUCCEEDED(mFontFace->GetGlyphIndicesA(&ucs, 1, &glyph))) {
278 mMetrics->aveCharWidth = MeasureGlyphWidth(glyph);
279 }
280 if (mMetrics->aveCharWidth < 1) {
281 // Let's just assume the X is square.
282 mMetrics->aveCharWidth = fontMetrics.xHeight * mFUnitsConvFactor;
283 }
284 }
286 ucs = L'0';
287 if (SUCCEEDED(mFontFace->GetGlyphIndicesA(&ucs, 1, &glyph))) {
288 mMetrics->zeroOrAveCharWidth = MeasureGlyphWidth(glyph);
289 }
290 if (mMetrics->zeroOrAveCharWidth < 1) {
291 mMetrics->zeroOrAveCharWidth = mMetrics->aveCharWidth;
292 }
294 mMetrics->underlineOffset =
295 fontMetrics.underlinePosition * mFUnitsConvFactor;
296 mMetrics->underlineSize =
297 fontMetrics.underlineThickness * mFUnitsConvFactor;
298 mMetrics->strikeoutOffset =
299 fontMetrics.strikethroughPosition * mFUnitsConvFactor;
300 mMetrics->strikeoutSize =
301 fontMetrics.strikethroughThickness * mFUnitsConvFactor;
302 mMetrics->superscriptOffset = 0;
303 mMetrics->subscriptOffset = 0;
305 SanitizeMetrics(mMetrics, GetFontEntry()->mIsBadUnderlineFont);
307 #if 0
308 printf("Font: %p (%s) size: %f\n", this,
309 NS_ConvertUTF16toUTF8(GetName()).get(), mStyle.size);
310 printf(" emHeight: %f emAscent: %f emDescent: %f\n", mMetrics->emHeight, mMetrics->emAscent, mMetrics->emDescent);
311 printf(" maxAscent: %f maxDescent: %f maxAdvance: %f\n", mMetrics->maxAscent, mMetrics->maxDescent, mMetrics->maxAdvance);
312 printf(" internalLeading: %f externalLeading: %f\n", mMetrics->internalLeading, mMetrics->externalLeading);
313 printf(" spaceWidth: %f aveCharWidth: %f zeroOrAve: %f xHeight: %f\n",
314 mMetrics->spaceWidth, mMetrics->aveCharWidth, mMetrics->zeroOrAveCharWidth, mMetrics->xHeight);
315 printf(" uOff: %f uSize: %f stOff: %f stSize: %f supOff: %f subOff: %f\n",
316 mMetrics->underlineOffset, mMetrics->underlineSize, mMetrics->strikeoutOffset, mMetrics->strikeoutSize,
317 mMetrics->superscriptOffset, mMetrics->subscriptOffset);
318 #endif
319 }
321 using namespace mozilla; // for AutoSwap_* types
323 struct EBLCHeader {
324 AutoSwap_PRUint32 version;
325 AutoSwap_PRUint32 numSizes;
326 };
328 struct SbitLineMetrics {
329 int8_t ascender;
330 int8_t descender;
331 uint8_t widthMax;
332 int8_t caretSlopeNumerator;
333 int8_t caretSlopeDenominator;
334 int8_t caretOffset;
335 int8_t minOriginSB;
336 int8_t minAdvanceSB;
337 int8_t maxBeforeBL;
338 int8_t minAfterBL;
339 int8_t pad1;
340 int8_t pad2;
341 };
343 struct BitmapSizeTable {
344 AutoSwap_PRUint32 indexSubTableArrayOffset;
345 AutoSwap_PRUint32 indexTablesSize;
346 AutoSwap_PRUint32 numberOfIndexSubTables;
347 AutoSwap_PRUint32 colorRef;
348 SbitLineMetrics hori;
349 SbitLineMetrics vert;
350 AutoSwap_PRUint16 startGlyphIndex;
351 AutoSwap_PRUint16 endGlyphIndex;
352 uint8_t ppemX;
353 uint8_t ppemY;
354 uint8_t bitDepth;
355 uint8_t flags;
356 };
358 typedef EBLCHeader EBSCHeader;
360 struct BitmapScaleTable {
361 SbitLineMetrics hori;
362 SbitLineMetrics vert;
363 uint8_t ppemX;
364 uint8_t ppemY;
365 uint8_t substitutePpemX;
366 uint8_t substitutePpemY;
367 };
369 bool
370 gfxDWriteFont::HasBitmapStrikeForSize(uint32_t aSize)
371 {
372 uint8_t *tableData;
373 uint32_t len;
374 void *tableContext;
375 BOOL exists;
376 HRESULT hr =
377 mFontFace->TryGetFontTable(DWRITE_MAKE_OPENTYPE_TAG('E', 'B', 'L', 'C'),
378 (const void**)&tableData, &len,
379 &tableContext, &exists);
380 if (FAILED(hr)) {
381 return false;
382 }
384 bool hasStrike = false;
385 // not really a loop, but this lets us use 'break' to skip out of the block
386 // as soon as we know the answer, and skips it altogether if the table is
387 // not present
388 while (exists) {
389 if (len < sizeof(EBLCHeader)) {
390 break;
391 }
392 const EBLCHeader *hdr = reinterpret_cast<const EBLCHeader*>(tableData);
393 if (hdr->version != 0x00020000) {
394 break;
395 }
396 uint32_t numSizes = hdr->numSizes;
397 if (numSizes > 0xffff) { // sanity-check, prevent overflow below
398 break;
399 }
400 if (len < sizeof(EBLCHeader) + numSizes * sizeof(BitmapSizeTable)) {
401 break;
402 }
403 const BitmapSizeTable *sizeTable =
404 reinterpret_cast<const BitmapSizeTable*>(hdr + 1);
405 for (uint32_t i = 0; i < numSizes; ++i, ++sizeTable) {
406 if (sizeTable->ppemX == aSize && sizeTable->ppemY == aSize) {
407 // we ignore a strike that contains fewer than 4 glyphs,
408 // as that probably indicates a font such as Courier New
409 // that provides bitmaps ONLY for the "shading" characters
410 // U+2591..2593
411 hasStrike = (uint16_t(sizeTable->endGlyphIndex) >=
412 uint16_t(sizeTable->startGlyphIndex) + 3);
413 break;
414 }
415 }
416 // if we reach here, we didn't find a strike; unconditionally break
417 // out of the while-loop block
418 break;
419 }
420 mFontFace->ReleaseFontTable(tableContext);
422 if (hasStrike) {
423 return true;
424 }
426 // if we didn't find a real strike, check if the font calls for scaling
427 // another bitmap to this size
428 hr = mFontFace->TryGetFontTable(DWRITE_MAKE_OPENTYPE_TAG('E', 'B', 'S', 'C'),
429 (const void**)&tableData, &len,
430 &tableContext, &exists);
431 if (FAILED(hr)) {
432 return false;
433 }
435 while (exists) {
436 if (len < sizeof(EBSCHeader)) {
437 break;
438 }
439 const EBSCHeader *hdr = reinterpret_cast<const EBSCHeader*>(tableData);
440 if (hdr->version != 0x00020000) {
441 break;
442 }
443 uint32_t numSizes = hdr->numSizes;
444 if (numSizes > 0xffff) {
445 break;
446 }
447 if (len < sizeof(EBSCHeader) + numSizes * sizeof(BitmapScaleTable)) {
448 break;
449 }
450 const BitmapScaleTable *scaleTable =
451 reinterpret_cast<const BitmapScaleTable*>(hdr + 1);
452 for (uint32_t i = 0; i < numSizes; ++i, ++scaleTable) {
453 if (scaleTable->ppemX == aSize && scaleTable->ppemY == aSize) {
454 hasStrike = true;
455 break;
456 }
457 }
458 break;
459 }
460 mFontFace->ReleaseFontTable(tableContext);
462 return hasStrike;
463 }
465 uint32_t
466 gfxDWriteFont::GetSpaceGlyph()
467 {
468 UINT32 ucs = L' ';
469 UINT16 glyph;
470 HRESULT hr;
471 hr = mFontFace->GetGlyphIndicesA(&ucs, 1, &glyph);
472 if (FAILED(hr)) {
473 return 0;
474 }
475 return glyph;
476 }
478 bool
479 gfxDWriteFont::SetupCairoFont(gfxContext *aContext)
480 {
481 cairo_scaled_font_t *scaledFont = GetCairoScaledFont();
482 if (cairo_scaled_font_status(scaledFont) != CAIRO_STATUS_SUCCESS) {
483 // Don't cairo_set_scaled_font as that would propagate the error to
484 // the cairo_t, precluding any further drawing.
485 return false;
486 }
487 cairo_set_scaled_font(aContext->GetCairo(), scaledFont);
488 return true;
489 }
491 bool
492 gfxDWriteFont::IsValid()
493 {
494 return mFontFace != nullptr;
495 }
497 IDWriteFontFace*
498 gfxDWriteFont::GetFontFace()
499 {
500 return mFontFace.get();
501 }
503 cairo_font_face_t *
504 gfxDWriteFont::CairoFontFace()
505 {
506 if (!mCairoFontFace) {
507 #ifdef CAIRO_HAS_DWRITE_FONT
508 mCairoFontFace =
509 cairo_dwrite_font_face_create_for_dwrite_fontface(
510 ((gfxDWriteFontEntry*)mFontEntry.get())->mFont, mFontFace);
511 #endif
512 }
513 return mCairoFontFace;
514 }
517 cairo_scaled_font_t *
518 gfxDWriteFont::GetCairoScaledFont()
519 {
520 if (!mScaledFont) {
521 cairo_matrix_t sizeMatrix;
522 cairo_matrix_t identityMatrix;
524 cairo_matrix_init_scale(&sizeMatrix, mAdjustedSize, mAdjustedSize);
525 cairo_matrix_init_identity(&identityMatrix);
527 cairo_font_options_t *fontOptions = cairo_font_options_create();
528 if (mNeedsOblique) {
529 double skewfactor = OBLIQUE_SKEW_FACTOR;
531 cairo_matrix_t style;
532 cairo_matrix_init(&style,
533 1, //xx
534 0, //yx
535 -1 * skewfactor, //xy
536 1, //yy
537 0, //x0
538 0); //y0
539 cairo_matrix_multiply(&sizeMatrix, &sizeMatrix, &style);
540 }
542 if (mAntialiasOption != kAntialiasDefault) {
543 cairo_font_options_set_antialias(fontOptions,
544 GetCairoAntialiasOption(mAntialiasOption));
545 }
547 mScaledFont = cairo_scaled_font_create(CairoFontFace(),
548 &sizeMatrix,
549 &identityMatrix,
550 fontOptions);
551 cairo_font_options_destroy(fontOptions);
553 cairo_dwrite_scaled_font_allow_manual_show_glyphs(mScaledFont,
554 mAllowManualShowGlyphs);
556 gfxDWriteFontEntry *fe =
557 static_cast<gfxDWriteFontEntry*>(mFontEntry.get());
558 cairo_dwrite_scaled_font_set_force_GDI_classic(mScaledFont,
559 GetForceGDIClassic());
560 }
562 NS_ASSERTION(mAdjustedSize == 0.0 ||
563 cairo_scaled_font_status(mScaledFont)
564 == CAIRO_STATUS_SUCCESS,
565 "Failed to make scaled font");
567 return mScaledFont;
568 }
570 gfxFont::RunMetrics
571 gfxDWriteFont::Measure(gfxTextRun *aTextRun,
572 uint32_t aStart, uint32_t aEnd,
573 BoundingBoxType aBoundingBoxType,
574 gfxContext *aRefContext,
575 Spacing *aSpacing)
576 {
577 gfxFont::RunMetrics metrics =
578 gfxFont::Measure(aTextRun, aStart, aEnd,
579 aBoundingBoxType, aRefContext, aSpacing);
581 // if aBoundingBoxType is LOOSE_INK_EXTENTS
582 // and the underlying cairo font may be antialiased,
583 // we can't trust Windows to have considered all the pixels
584 // so we need to add "padding" to the bounds.
585 // (see bugs 475968, 439831, compare also bug 445087)
586 if (aBoundingBoxType == LOOSE_INK_EXTENTS &&
587 mAntialiasOption != kAntialiasNone &&
588 GetMeasuringMode() == DWRITE_MEASURING_MODE_GDI_CLASSIC &&
589 metrics.mBoundingBox.width > 0) {
590 metrics.mBoundingBox.x -= aTextRun->GetAppUnitsPerDevUnit();
591 metrics.mBoundingBox.width += aTextRun->GetAppUnitsPerDevUnit() * 3;
592 }
594 return metrics;
595 }
597 bool
598 gfxDWriteFont::ProvidesGlyphWidths()
599 {
600 return !mUseSubpixelPositions ||
601 (mFontFace->GetSimulations() & DWRITE_FONT_SIMULATIONS_BOLD);
602 }
604 int32_t
605 gfxDWriteFont::GetGlyphWidth(gfxContext *aCtx, uint16_t aGID)
606 {
607 if (!mGlyphWidths) {
608 mGlyphWidths = new nsDataHashtable<nsUint32HashKey,int32_t>(200);
609 }
611 int32_t width = -1;
612 if (mGlyphWidths->Get(aGID, &width)) {
613 return width;
614 }
616 width = NS_lround(MeasureGlyphWidth(aGID) * 65536.0);
617 mGlyphWidths->Put(aGID, width);
618 return width;
619 }
621 TemporaryRef<GlyphRenderingOptions>
622 gfxDWriteFont::GetGlyphRenderingOptions()
623 {
624 if (UsingClearType()) {
625 return Factory::CreateDWriteGlyphRenderingOptions(
626 gfxWindowsPlatform::GetPlatform()->GetRenderingParams(GetForceGDIClassic() ?
627 gfxWindowsPlatform::TEXT_RENDERING_GDI_CLASSIC : gfxWindowsPlatform::TEXT_RENDERING_NORMAL));
628 } else {
629 return Factory::CreateDWriteGlyphRenderingOptions(gfxWindowsPlatform::GetPlatform()->
630 GetRenderingParams(gfxWindowsPlatform::TEXT_RENDERING_NO_CLEARTYPE));
631 }
632 }
634 bool
635 gfxDWriteFont::GetForceGDIClassic()
636 {
637 return static_cast<gfxDWriteFontEntry*>(mFontEntry.get())->GetForceGDIClassic() &&
638 cairo_dwrite_get_cleartype_rendering_mode() < 0 &&
639 GetAdjustedSize() <=
640 gfxDWriteFontList::PlatformFontList()->GetForceGDIClassicMaxFontSize();
641 }
643 DWRITE_MEASURING_MODE
644 gfxDWriteFont::GetMeasuringMode()
645 {
646 return GetForceGDIClassic()
647 ? DWRITE_MEASURING_MODE_GDI_CLASSIC
648 : gfxWindowsPlatform::GetPlatform()->DWriteMeasuringMode();
649 }
651 gfxFloat
652 gfxDWriteFont::MeasureGlyphWidth(uint16_t aGlyph)
653 {
654 DWRITE_GLYPH_METRICS metrics;
655 HRESULT hr;
656 if (mUseSubpixelPositions) {
657 hr = mFontFace->GetDesignGlyphMetrics(&aGlyph, 1, &metrics, FALSE);
658 if (SUCCEEDED(hr)) {
659 return metrics.advanceWidth * mFUnitsConvFactor;
660 }
661 } else {
662 hr = mFontFace->GetGdiCompatibleGlyphMetrics(
663 FLOAT(mAdjustedSize), 1.0f, nullptr,
664 GetMeasuringMode() == DWRITE_MEASURING_MODE_GDI_NATURAL,
665 &aGlyph, 1, &metrics, FALSE);
666 if (SUCCEEDED(hr)) {
667 return NS_lround(metrics.advanceWidth * mFUnitsConvFactor);
668 }
669 }
670 return 0;
671 }
673 void
674 gfxDWriteFont::AddSizeOfExcludingThis(MallocSizeOf aMallocSizeOf,
675 FontCacheSizes* aSizes) const
676 {
677 gfxFont::AddSizeOfExcludingThis(aMallocSizeOf, aSizes);
678 aSizes->mFontInstances += aMallocSizeOf(mMetrics);
679 if (mGlyphWidths) {
680 aSizes->mFontInstances +=
681 mGlyphWidths->SizeOfExcludingThis(nullptr, aMallocSizeOf);
682 }
683 }
685 void
686 gfxDWriteFont::AddSizeOfIncludingThis(MallocSizeOf aMallocSizeOf,
687 FontCacheSizes* aSizes) const
688 {
689 aSizes->mFontInstances += aMallocSizeOf(this);
690 AddSizeOfExcludingThis(aMallocSizeOf, aSizes);
691 }
693 TemporaryRef<ScaledFont>
694 gfxDWriteFont::GetScaledFont(mozilla::gfx::DrawTarget *aTarget)
695 {
696 bool wantCairo = aTarget->GetType() == BackendType::CAIRO;
697 if (mAzureScaledFont && mAzureScaledFontIsCairo == wantCairo) {
698 return mAzureScaledFont;
699 }
701 NativeFont nativeFont;
702 nativeFont.mType = NativeFontType::DWRITE_FONT_FACE;
703 nativeFont.mFont = GetFontFace();
705 if (wantCairo) {
706 mAzureScaledFont = Factory::CreateScaledFontWithCairo(nativeFont,
707 GetAdjustedSize(),
708 GetCairoScaledFont());
709 } else {
710 mAzureScaledFont = Factory::CreateScaledFontForNativeFont(nativeFont,
711 GetAdjustedSize());
712 }
714 mAzureScaledFontIsCairo = wantCairo;
716 return mAzureScaledFont;
717 }
