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 (d1c688190228)

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
/* -*- 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 "gfxFT2FontBase.h"
#include "gfxFT2Utils.h"
#include "mozilla/Likely.h"

#ifdef HAVE_FONTCONFIG_FCFREETYPE_H
#include <fontconfig/fcfreetype.h>
#endif

#include "prlink.h"

uint32_t gfxFT2LockedFace::GetGlyph(uint32_t aCharCode) {
  if (MOZ_UNLIKELY(!mFace)) return 0;

#ifdef HAVE_FONTCONFIG_FCFREETYPE_H
  // FcFreeTypeCharIndex will search starting from the most recently
  // selected charmap.  This can cause non-determistic behavior when more
  // than one charmap supports a character but with different glyphs, as
  // with older versions of MS Gothic, for example.  Always prefer a Unicode
  // charmap, if there is one.  (FcFreeTypeCharIndex usually does the
  // appropriate Unicode conversion, but some fonts have non-Roman glyphs
  // for FT_ENCODING_APPLE_ROMAN characters.)
  if (!mFace->charmap || mFace->charmap->encoding != FT_ENCODING_UNICODE) {
    FT_Select_Charmap(mFace, FT_ENCODING_UNICODE);
  }

  return FcFreeTypeCharIndex(mFace, aCharCode);
#else
  return FT_Get_Char_Index(mFace, aCharCode);
#endif
}

typedef FT_UInt (*GetCharVariantFunction)(FT_Face face, FT_ULong charcode,
                                          FT_ULong variantSelector);

uint32_t gfxFT2LockedFace::GetUVSGlyph(uint32_t aCharCode,
                                       uint32_t aVariantSelector) {
  NS_PRECONDITION(aVariantSelector, "aVariantSelector should not be NULL");

  if (MOZ_UNLIKELY(!mFace)) return 0;

  // This function is available from FreeType 2.3.6 (June 2008).
  static CharVariantFunction sGetCharVariantPtr = FindCharVariantFunction();
  if (!sGetCharVariantPtr) return 0;

#ifdef HAVE_FONTCONFIG_FCFREETYPE_H
  // FcFreeTypeCharIndex may have changed the selected charmap.
  // FT_Face_GetCharVariantIndex needs a unicode charmap.
  if (!mFace->charmap || mFace->charmap->encoding != FT_ENCODING_UNICODE) {
    FT_Select_Charmap(mFace, FT_ENCODING_UNICODE);
  }
#endif

  return (*sGetCharVariantPtr)(mFace, aCharCode, aVariantSelector);
}

gfxFT2LockedFace::CharVariantFunction
gfxFT2LockedFace::FindCharVariantFunction() {
  // This function is available from FreeType 2.3.6 (June 2008).
  PRLibrary *lib = nullptr;
  CharVariantFunction function = reinterpret_cast<CharVariantFunction>(
      PR_FindFunctionSymbolAndLibrary("FT_Face_GetCharVariantIndex", &lib));
  if (!lib) {
    return nullptr;
  }

  FT_Int major;
  FT_Int minor;
  FT_Int patch;
  FT_Library_Version(mFace->glyph->library, &major, &minor, &patch);

  // Versions 2.4.0 to 2.4.3 crash if configured with
  // FT_CONFIG_OPTION_OLD_INTERNALS.  Presence of the symbol FT_Alloc
  // indicates FT_CONFIG_OPTION_OLD_INTERNALS.
  if (major == 2 && minor == 4 && patch < 4 &&
      PR_FindFunctionSymbol(lib, "FT_Alloc")) {
    function = nullptr;
  }

  // Decrement the reference count incremented in
  // PR_FindFunctionSymbolAndLibrary.
  PR_UnloadLibrary(lib);

  return function;
}