DXR is a code search and navigation tool aimed at making sense of large projects. It supports full-text and regex searches as well as structural queries.

Header

Mercurial (107b18856f78)

VCS Links

Line Code
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
/* -*- Mode: C++; tab-width: 8; indent-tabs-mode: nil; c-basic-offset: 2 -*- */
/* vim: set ts=8 sts=2 et sw=2 tw=80: */
/* 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 "ScaledFontDWrite.h"
#include "UnscaledFontDWrite.h"
#include "PathD2D.h"
#include "gfxFont.h"
#include "Logging.h"
#include "mozilla/FontPropertyTypes.h"
#include "mozilla/webrender/WebRenderTypes.h"
#include "HelpersD2D.h"

#include "dwrite_3.h"

// Currently, we build with WINVER=0x601 (Win7), which means newer
// declarations in dwrite_3.h will not be visible. Also, we don't
// yet have the Fall Creators Update SDK available on build machines,
// so even with updated WINVER, some of the interfaces we need would
// not be present.
// To work around this, until the build environment is updated,
// we #include an extra header that contains copies of the relevant
// classes/interfaces we need.
#if !defined(__MINGW32__) && WINVER < 0x0A00
#  include "dw-extra.h"
#endif

using namespace std;

#ifdef USE_SKIA
#  include "PathSkia.h"
#  include "skia/include/core/SkPaint.h"
#  include "skia/include/core/SkPath.h"
#  include "skia/include/ports/SkTypeface_win.h"
#endif

#include <vector>

#ifdef USE_CAIRO_SCALED_FONT
#  include "cairo-win32.h"
#endif

#include "HelpersWinFonts.h"

namespace mozilla {
namespace gfx {

#define GASP_TAG 0x70736167
#define GASP_DOGRAY 0x2

static inline unsigned short readShort(const char* aBuf) {
  return (*aBuf << 8) | *(aBuf + 1);
}

static bool DoGrayscale(IDWriteFontFace* aDWFace, Float ppem) {
  void* tableContext;
  char* tableData;
  UINT32 tableSize;
  BOOL exists;
  aDWFace->TryGetFontTable(GASP_TAG, (const void**)&tableData, &tableSize,
                           &tableContext, &exists);

  if (exists) {
    if (tableSize < 4) {
      aDWFace->ReleaseFontTable(tableContext);
      return true;
    }
    struct gaspRange {
      unsigned short maxPPEM;   // Stored big-endian
      unsigned short behavior;  // Stored big-endian
    };
    unsigned short numRanges = readShort(tableData + 2);
    if (tableSize < (UINT)4 + numRanges * 4) {
      aDWFace->ReleaseFontTable(tableContext);
      return true;
    }
    gaspRange* ranges = (gaspRange*)(tableData + 4);
    for (int i = 0; i < numRanges; i++) {
      if (readShort((char*)&ranges[i].maxPPEM) > ppem) {
        if (!(readShort((char*)&ranges[i].behavior) & GASP_DOGRAY)) {
          aDWFace->ReleaseFontTable(tableContext);
          return false;
        }
        break;
      }
    }
    aDWFace->ReleaseFontTable(tableContext);
  }
  return true;
}

static inline DWRITE_FONT_STRETCH DWriteFontStretchFromStretch(
    FontStretch aStretch) {
  if (aStretch == FontStretch::UltraCondensed()) {
    return DWRITE_FONT_STRETCH_ULTRA_CONDENSED;
  }
  if (aStretch == FontStretch::ExtraCondensed()) {
    return DWRITE_FONT_STRETCH_EXTRA_CONDENSED;
  }
  if (aStretch == FontStretch::Condensed()) {
    return DWRITE_FONT_STRETCH_CONDENSED;
  }
  if (aStretch == FontStretch::SemiCondensed()) {
    return DWRITE_FONT_STRETCH_SEMI_CONDENSED;
  }
  if (aStretch == FontStretch::Normal()) {
    return DWRITE_FONT_STRETCH_NORMAL;
  }
  if (aStretch == FontStretch::SemiExpanded()) {
    return DWRITE_FONT_STRETCH_SEMI_EXPANDED;
  }
  if (aStretch == FontStretch::Expanded()) {
    return DWRITE_FONT_STRETCH_EXPANDED;
  }
  if (aStretch == FontStretch::ExtraExpanded()) {
    return DWRITE_FONT_STRETCH_EXTRA_EXPANDED;
  }
  if (aStretch == FontStretch::UltraExpanded()) {
    return DWRITE_FONT_STRETCH_ULTRA_EXPANDED;
  }
  return DWRITE_FONT_STRETCH_UNDEFINED;
}

ScaledFontDWrite::ScaledFontDWrite(IDWriteFontFace* aFontFace,
                                   const RefPtr<UnscaledFont>& aUnscaledFont,
                                   Float aSize, bool aUseEmbeddedBitmap,
                                   bool aForceGDIMode,
                                   IDWriteRenderingParams* aParams,
                                   Float aGamma, Float aContrast,
                                   const gfxFontStyle* aStyle)
    : ScaledFontBase(aUnscaledFont, aSize),
      mFontFace(aFontFace),
      mUseEmbeddedBitmap(aUseEmbeddedBitmap),
      mForceGDIMode(aForceGDIMode),
      mParams(aParams),
      mGamma(aGamma),
      mContrast(aContrast) {
  if (aStyle) {
    mStyle = SkFontStyle(aStyle->weight.ToIntRounded(),
                         DWriteFontStretchFromStretch(aStyle->stretch),
                         // FIXME(jwatt): also use kOblique_Slant
                         aStyle->style == FontSlantStyle::Normal()
                             ? SkFontStyle::kUpright_Slant
                             : SkFontStyle::kItalic_Slant);
  }
}

already_AddRefed<Path> ScaledFontDWrite::GetPathForGlyphs(
    const GlyphBuffer& aBuffer, const DrawTarget* aTarget) {
  if (aTarget->GetBackendType() != BackendType::DIRECT2D &&
      aTarget->GetBackendType() != BackendType::DIRECT2D1_1) {
    return ScaledFontBase::GetPathForGlyphs(aBuffer, aTarget);
  }

  RefPtr<PathBuilder> pathBuilder = aTarget->CreatePathBuilder();

  PathBuilderD2D* pathBuilderD2D =
      static_cast<PathBuilderD2D*>(pathBuilder.get());

  CopyGlyphsToSink(aBuffer, pathBuilderD2D->GetSink());

  return pathBuilder->Finish();
}

#ifdef USE_SKIA
SkTypeface* ScaledFontDWrite::CreateSkTypeface() {
  RefPtr<IDWriteFactory> factory = Factory::GetDWriteFactory();
  if (!factory) {
    return nullptr;
  }

  Float gamma = mGamma;
  // Skia doesn't support a gamma value outside of 0-4, so default to 2.2
  if (gamma < 0.0f || gamma > 4.0f) {
    gamma = 2.2f;
  }

  Float contrast = mContrast;
  // Skia doesn't support a contrast value outside of 0-1, so default to 1.0
  if (contrast < 0.0f || contrast > 1.0f) {
    contrast = 1.0f;
  }

  return SkCreateTypefaceFromDWriteFont(factory, mFontFace, mStyle,
                                        mForceGDIMode, gamma, contrast);
}
#endif

void ScaledFontDWrite::CopyGlyphsToBuilder(const GlyphBuffer& aBuffer,
                                           PathBuilder* aBuilder,
                                           const Matrix* aTransformHint) {
  BackendType backendType = aBuilder->GetBackendType();
  if (backendType == BackendType::CAPTURE) {
    StreamingGeometrySink sink(aBuilder);
    CopyGlyphsToSink(aBuffer, &sink);
    return;
  }

  if (backendType != BackendType::DIRECT2D &&
      backendType != BackendType::DIRECT2D1_1) {
    ScaledFontBase::CopyGlyphsToBuilder(aBuffer, aBuilder, aTransformHint);
    return;
  }

  PathBuilderD2D* pathBuilderD2D = static_cast<PathBuilderD2D*>(aBuilder);

  if (pathBuilderD2D->IsFigureActive()) {
    gfxCriticalNote
        << "Attempting to copy glyphs to PathBuilderD2D with active figure.";
  }

  CopyGlyphsToSink(aBuffer, pathBuilderD2D->GetSink());
}

void ScaledFontDWrite::GetGlyphDesignMetrics(const uint16_t* aGlyphs,
                                             uint32_t aNumGlyphs,
                                             GlyphMetrics* aGlyphMetrics) {
  DWRITE_FONT_METRICS fontMetrics;
  mFontFace->GetMetrics(&fontMetrics);

  vector<DWRITE_GLYPH_METRICS> metrics(aNumGlyphs);
  mFontFace->GetDesignGlyphMetrics(aGlyphs, aNumGlyphs, &metrics.front());

  Float scaleFactor = mSize / fontMetrics.designUnitsPerEm;

  for (uint32_t i = 0; i < aNumGlyphs; i++) {
    aGlyphMetrics[i].mXBearing = metrics[i].leftSideBearing * scaleFactor;
    aGlyphMetrics[i].mXAdvance = metrics[i].advanceWidth * scaleFactor;
    aGlyphMetrics[i].mYBearing =
        (metrics[i].topSideBearing - metrics[i].verticalOriginY) * scaleFactor;
    aGlyphMetrics[i].mYAdvance = metrics[i].advanceHeight * scaleFactor;
    aGlyphMetrics[i].mWidth =
        (metrics[i].advanceWidth - metrics[i].leftSideBearing -
         metrics[i].rightSideBearing) *
        scaleFactor;
    aGlyphMetrics[i].mHeight =
        (metrics[i].advanceHeight - metrics[i].topSideBearing -
         metrics[i].bottomSideBearing) *
        scaleFactor;
  }
}

void ScaledFontDWrite::CopyGlyphsToSink(const GlyphBuffer& aBuffer,
                                        ID2D1SimplifiedGeometrySink* aSink) {
  std::vector<UINT16> indices;
  std::vector<FLOAT> advances;
  std::vector<DWRITE_GLYPH_OFFSET> offsets;
  indices.resize(aBuffer.mNumGlyphs);
  advances.resize(aBuffer.mNumGlyphs);
  offsets.resize(aBuffer.mNumGlyphs);

  memset(&advances.front(), 0, sizeof(FLOAT) * aBuffer.mNumGlyphs);
  for (unsigned int i = 0; i < aBuffer.mNumGlyphs; i++) {
    indices[i] = aBuffer.mGlyphs[i].mIndex;
    offsets[i].advanceOffset = aBuffer.mGlyphs[i].mPosition.x;
    offsets[i].ascenderOffset = -aBuffer.mGlyphs[i].mPosition.y;
  }

  HRESULT hr = mFontFace->GetGlyphRunOutline(
      mSize, &indices.front(), &advances.front(), &offsets.front(),
      aBuffer.mNumGlyphs, FALSE, FALSE, aSink);
  if (FAILED(hr)) {
    gfxCriticalNote << "Failed to copy glyphs to geometry sink. Code: "
                    << hexa(hr);
  }
}

bool UnscaledFontDWrite::GetFontFileData(FontFileDataOutput aDataCallback,
                                         void* aBaton) {
  UINT32 fileCount = 0;
  HRESULT hr = mFontFace->GetFiles(&fileCount, nullptr);

  if (FAILED(hr) || fileCount > 1) {
    MOZ_ASSERT(false);
    return false;
  }

  if (!aDataCallback) {
    return true;
  }

  RefPtr<IDWriteFontFile> file;
  hr = mFontFace->GetFiles(&fileCount, getter_AddRefs(file));
  if (FAILED(hr)) {
    return false;
  }

  const void* referenceKey;
  UINT32 refKeySize;
  // XXX - This can currently crash for webfonts, as when we get the reference
  // key out of the file, that can be an invalid reference key for the loader
  // we use it with. The fix to this is not obvious but it will probably
  // have to happen inside thebes.
  hr = file->GetReferenceKey(&referenceKey, &refKeySize);
  if (FAILED(hr)) {
    return false;
  }

  RefPtr<IDWriteFontFileLoader> loader;
  hr = file->GetLoader(getter_AddRefs(loader));
  if (FAILED(hr)) {
    return false;
  }

  RefPtr<IDWriteFontFileStream> stream;
  hr = loader->CreateStreamFromKey(referenceKey, refKeySize, getter_AddRefs(stream));
  if (FAILED(hr)) {
    return false;
  }

  UINT64 fileSize64;
  hr = stream->GetFileSize(&fileSize64);
  if (FAILED(hr) || fileSize64 > UINT32_MAX) {
    MOZ_ASSERT(false);
    return false;
  }

  uint32_t fileSize = static_cast<uint32_t>(fileSize64);
  const void* fragmentStart;
  void* context;
  hr = stream->ReadFileFragment(&fragmentStart, 0, fileSize, &context);
  if (FAILED(hr)) {
    return false;
  }

  aDataCallback((uint8_t*)fragmentStart, fileSize, mFontFace->GetIndex(),
                aBaton);

  stream->ReleaseFileFragment(context);

  return true;
}

static bool GetFontFileName(RefPtr<IDWriteFontFace> aFontFace,
                            std::vector<WCHAR>& aFileName) {
  UINT32 numFiles;
  HRESULT hr = aFontFace->GetFiles(&numFiles, nullptr);
  if (FAILED(hr)) {
    gfxDebug() << "Failed getting file count for WR font";
    return false;
  } else if (numFiles != 1) {
    gfxDebug() << "Invalid file count " << numFiles << " for WR font";
    return false;
  }

  RefPtr<IDWriteFontFile> file;
  hr = aFontFace->GetFiles(&numFiles, getter_AddRefs(file));
  if (FAILED(hr)) {
    gfxDebug() << "Failed getting file for WR font";
    return false;
  }

  const void* key;
  UINT32 keySize;
  hr = file->GetReferenceKey(&key, &keySize);
  if (FAILED(hr)) {
    gfxDebug() << "Failed getting file ref key for WR font";
    return false;
  }
  RefPtr<IDWriteFontFileLoader> loader;
  hr = file->GetLoader(getter_AddRefs(loader));
  if (FAILED(hr)) {
    gfxDebug() << "Failed getting file loader for WR font";
    return false;
  }
  RefPtr<IDWriteLocalFontFileLoader> localLoader;
  loader->QueryInterface(__uuidof(IDWriteLocalFontFileLoader),
                         (void**)getter_AddRefs(localLoader));
  if (!localLoader) {
    gfxDebug() << "Failed querying loader interface for WR font";
    return false;
  }
  UINT32 pathLen;
  hr = localLoader->GetFilePathLengthFromKey(key, keySize, &pathLen);
  if (FAILED(hr)) {
    gfxDebug() << "Failed getting path length for WR font";
    return false;
  }
  aFileName.resize(pathLen + 1);
  hr = localLoader->GetFilePathFromKey(key, keySize, aFileName.data(),
                                       pathLen + 1);
  if (FAILED(hr) || aFileName.back() != 0) {
    gfxDebug() << "Failed getting path for WR font";
    return false;
  }
  DWORD attribs = GetFileAttributesW(aFileName.data());
  if (attribs == INVALID_FILE_ATTRIBUTES) {
    gfxDebug() << "Invalid file \"" << aFileName.data() << "\" for WR font";
    return false;
  }
  aFileName.pop_back();
  return true;
}

bool UnscaledFontDWrite::GetWRFontDescriptor(WRFontDescriptorOutput aCb,
                                             void* aBaton) {
  if (!mFont) {
    return false;
  }

  std::vector<WCHAR> fileName;
  if (!GetFontFileName(mFontFace, fileName)) {
    return false;
  }
  uint32_t index = mFontFace->GetIndex();

  aCb(reinterpret_cast<const uint8_t*>(fileName.data()),
      fileName.size() * sizeof(WCHAR), index, aBaton);
  return true;
}

ScaledFontDWrite::InstanceData::InstanceData(
    const wr::FontInstanceOptions* aOptions,
    const wr::FontInstancePlatformOptions* aPlatformOptions)
    : mUseEmbeddedBitmap(false),
      mForceGDIMode(false),
      mGamma(2.2f),
      mContrast(1.0f) {
  if (aOptions) {
    if (aOptions->flags & wr::FontInstanceFlags_EMBEDDED_BITMAPS) {
      mUseEmbeddedBitmap = true;
    }
    if (aOptions->flags & wr::FontInstanceFlags_FORCE_GDI) {
      mForceGDIMode = true;
    }
  }
  if (aPlatformOptions) {
    mGamma = aPlatformOptions->gamma / 100.0f;
    mContrast = aPlatformOptions->contrast / 100.0f;
  }
}

// Helper for ScaledFontDWrite::GetFontInstanceData: if the font has variation
// axes, get their current values into the aOutput vector.
static void GetVariationsFromFontFace(IDWriteFontFace* aFace,
                                      std::vector<FontVariation>* aOutput) {
  RefPtr<IDWriteFontFace5> ff5;
  aFace->QueryInterface(__uuidof(IDWriteFontFace5),
                        (void**)getter_AddRefs(ff5));
  if (!ff5 || !ff5->HasVariations()) {
    return;
  }

  uint32_t count = ff5->GetFontAxisValueCount();
  if (!count) {
    return;
  }

  RefPtr<IDWriteFontResource> res;
  if (FAILED(ff5->GetFontResource(getter_AddRefs(res)))) {
    return;
  }

  std::vector<DWRITE_FONT_AXIS_VALUE> values(count);
  if (FAILED(ff5->GetFontAxisValues(values.data(), count))) {
    return;
  }

  aOutput->reserve(count);
  for (uint32_t i = 0; i < count; i++) {
    DWRITE_FONT_AXIS_ATTRIBUTES attr = res->GetFontAxisAttributes(i);
    if (attr & DWRITE_FONT_AXIS_ATTRIBUTES_VARIABLE) {
      float v = values[i].value;
      uint32_t t = TRUETYPE_TAG(
          uint8_t(values[i].axisTag), uint8_t(values[i].axisTag >> 8),
          uint8_t(values[i].axisTag >> 16), uint8_t(values[i].axisTag >> 24));
      aOutput->push_back(FontVariation{uint32_t(t), float(v)});
    }
  }
}

bool ScaledFontDWrite::GetFontInstanceData(FontInstanceDataOutput aCb,
                                           void* aBaton) {
  InstanceData instance(this);

  // If the font has variations, get the list of axis values.
  std::vector<FontVariation> variations;
  GetVariationsFromFontFace(mFontFace, &variations);

  aCb(reinterpret_cast<uint8_t*>(&instance), sizeof(instance),
      variations.data(), variations.size(), aBaton);

  return true;
}

bool ScaledFontDWrite::GetWRFontInstanceOptions(
    Maybe<wr::FontInstanceOptions>* aOutOptions,
    Maybe<wr::FontInstancePlatformOptions>* aOutPlatformOptions,
    std::vector<FontVariation>* aOutVariations) {
  wr::FontInstanceOptions options;
  bool useSubpixel = !mParams || mParams->GetClearTypeLevel() != 0.0f;
  options.render_mode = wr::ToFontRenderMode(GetDefaultAAMode(), useSubpixel);
  options.flags = wr::FontInstanceFlags{0};
  if (mFontFace->GetSimulations() & DWRITE_FONT_SIMULATIONS_BOLD) {
    options.flags |= wr::FontInstanceFlags_SYNTHETIC_BOLD;
  }
  if (UseEmbeddedBitmaps()) {
    options.flags |= wr::FontInstanceFlags_EMBEDDED_BITMAPS;
  }
  if (ForceGDIMode()) {
    options.flags |= wr::FontInstanceFlags_FORCE_GDI;
  } else {
    options.flags |= wr::FontInstanceFlags_SUBPIXEL_POSITION;
  }
  if (Factory::GetBGRSubpixelOrder()) {
    options.flags |= wr::FontInstanceFlags_SUBPIXEL_BGR;
  }
  options.bg_color = wr::ToColorU(Color());
  options.synthetic_italics =
      wr::DegreesToSyntheticItalics(GetSyntheticObliqueAngle());

  wr::FontInstancePlatformOptions platformOptions;
  platformOptions.gamma = uint16_t(std::round(mGamma * 100.0f));
  platformOptions.contrast =
      uint16_t(std::round(std::min(mContrast, 1.0f) * 100.0f));

  *aOutOptions = Some(options);
  *aOutPlatformOptions = Some(platformOptions);

  GetVariationsFromFontFace(mFontFace, aOutVariations);

  return true;
}

// Helper for UnscaledFontDWrite::CreateScaledFont: create a clone of the
// given IDWriteFontFace, with specified variation-axis values applied.
// Returns nullptr in case of failure.
static already_AddRefed<IDWriteFontFace5> CreateFaceWithVariations(
    IDWriteFontFace* aFace, const FontVariation* aVariations,
    uint32_t aNumVariations) {
  auto makeDWriteAxisTag = [](uint32_t aTag) {
    return DWRITE_MAKE_FONT_AXIS_TAG((aTag >> 24) & 0xff, (aTag >> 16) & 0xff,
                                     (aTag >> 8) & 0xff, aTag & 0xff);
  };

  RefPtr<IDWriteFontFace5> ff5;
  aFace->QueryInterface(__uuidof(IDWriteFontFace5),
                        (void**)getter_AddRefs(ff5));
  if (!ff5) {
    return nullptr;
  }

  DWRITE_FONT_SIMULATIONS sims = aFace->GetSimulations();
  RefPtr<IDWriteFontResource> res;
  if (FAILED(ff5->GetFontResource(getter_AddRefs(res)))) {
    return nullptr;
  }

  std::vector<DWRITE_FONT_AXIS_VALUE> fontAxisValues;
  fontAxisValues.reserve(aNumVariations);
  for (uint32_t i = 0; i < aNumVariations; i++) {
    DWRITE_FONT_AXIS_VALUE axisValue = {makeDWriteAxisTag(aVariations[i].mTag),
                                        aVariations[i].mValue};
    fontAxisValues.push_back(axisValue);
  }

  RefPtr<IDWriteFontFace5> newFace;
  if (FAILED(res->CreateFontFace(sims, fontAxisValues.data(),
                                 fontAxisValues.size(),
                                 getter_AddRefs(newFace)))) {
    return nullptr;
  }

  return newFace.forget();
}

already_AddRefed<ScaledFont> UnscaledFontDWrite::CreateScaledFont(
    Float aGlyphSize, const uint8_t* aInstanceData,
    uint32_t aInstanceDataLength, const FontVariation* aVariations,
    uint32_t aNumVariations) {
  if (aInstanceDataLength < sizeof(ScaledFontDWrite::InstanceData)) {
    gfxWarning() << "DWrite scaled font instance data is truncated.";
    return nullptr;
  }
  const ScaledFontDWrite::InstanceData& instanceData =
      *reinterpret_cast<const ScaledFontDWrite::InstanceData*>(aInstanceData);

  IDWriteFontFace* face = mFontFace;

  // If variations are required, we create a separate IDWriteFontFace5 with
  // the requested settings applied.
  RefPtr<IDWriteFontFace5> ff5;
  if (aNumVariations) {
    ff5 = CreateFaceWithVariations(mFontFace, aVariations, aNumVariations);
    if (ff5) {
      face = ff5;
    } else {
      gfxWarning() << "Failed to create IDWriteFontFace5 with variations.";
    }
  }

  RefPtr<ScaledFontBase> scaledFont = new ScaledFontDWrite(
      face, this, aGlyphSize, instanceData.mUseEmbeddedBitmap,
      instanceData.mForceGDIMode, nullptr, instanceData.mGamma,
      instanceData.mContrast);

  if (mNeedsCairo && !scaledFont->PopulateCairoScaledFont()) {
    gfxWarning() << "Unable to create cairo scaled font DWrite font.";
    return nullptr;
  }

  return scaledFont.forget();
}

already_AddRefed<ScaledFont> UnscaledFontDWrite::CreateScaledFontFromWRFont(
    Float aGlyphSize, const wr::FontInstanceOptions* aOptions,
    const wr::FontInstancePlatformOptions* aPlatformOptions,
    const FontVariation* aVariations, uint32_t aNumVariations) {
  ScaledFontDWrite::InstanceData instanceData(aOptions, aPlatformOptions);
  return CreateScaledFont(aGlyphSize, reinterpret_cast<uint8_t*>(&instanceData),
                          sizeof(instanceData), aVariations, aNumVariations);
}

AntialiasMode ScaledFontDWrite::GetDefaultAAMode() {
  AntialiasMode defaultMode = GetSystemDefaultAAMode();

  if (defaultMode == AntialiasMode::GRAY) {
    if (!DoGrayscale(mFontFace, mSize)) {
      defaultMode = AntialiasMode::NONE;
    }
  }
  return defaultMode;
}

#ifdef USE_CAIRO_SCALED_FONT
cairo_font_face_t* ScaledFontDWrite::GetCairoFontFace() {
  if (!mFontFace) {
    return nullptr;
  }

  return cairo_dwrite_font_face_create_for_dwrite_fontface(nullptr, mFontFace);
}
#endif

}  // namespace gfx
}  // namespace mozilla