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gecko/gfx/thebes/gfxPangoFonts.cpp

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/* -*- 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 "prlink.h"
#include "gfxTypes.h"
#include "nsTArray.h"
#include "gfxContext.h"
#ifdef MOZ_WIDGET_GTK
#include "gfxPlatformGtk.h"
#endif
#ifdef MOZ_WIDGET_QT
#include "gfxQtPlatform.h"
#endif
#include "gfxPangoFonts.h"
#include "gfxFT2FontBase.h"
#include "gfxFT2Utils.h"
#include "harfbuzz/hb.h"
#include "harfbuzz/hb-ot.h"
#include "nsUnicodeProperties.h"
#include "nsUnicodeScriptCodes.h"
#include "gfxFontconfigUtils.h"
#include "gfxUserFontSet.h"
#include "gfxFontConstants.h"
#include <cairo.h>
#include <cairo-ft.h>
#include <fontconfig/fcfreetype.h>
#include <pango/pango.h>
#include FT_TRUETYPE_TABLES_H
#ifdef MOZ_WIDGET_GTK
#include <gdk/gdk.h>
#endif
#include <math.h>
using namespace mozilla;
using namespace mozilla::unicode;
#define PRINTING_FC_PROPERTY "gfx.printing"
static PangoLanguage *GuessPangoLanguage(nsIAtom *aLanguage);
static cairo_scaled_font_t *
CreateScaledFont(FcPattern *aPattern, cairo_font_face_t *aFace);
static FT_Library gFTLibrary;
// FC_FAMILYLANG and FC_FULLNAME were introduced in fontconfig-2.2.97
// and so fontconfig-2.3.0 (2005).
#ifndef FC_FAMILYLANG
#define FC_FAMILYLANG "familylang"
#endif
#ifndef FC_FULLNAME
#define FC_FULLNAME "fullname"
#endif
static PRFuncPtr
FindFunctionSymbol(const char *name)
{
PRLibrary *lib = nullptr;
PRFuncPtr result = PR_FindFunctionSymbolAndLibrary(name, &lib);
if (lib) {
PR_UnloadLibrary(lib);
}
return result;
}
static bool HasChar(FcPattern *aFont, FcChar32 wc)
{
FcCharSet *charset = nullptr;
FcPatternGetCharSet(aFont, FC_CHARSET, 0, &charset);
return charset && FcCharSetHasChar(charset, wc);
}
/**
* gfxFcFontEntry:
*
* An abstract base class of for gfxFontEntry implementations used by
* gfxFcFont and gfxUserFontSet.
*/
class gfxFcFontEntry : public gfxFontEntry {
public:
// For all FontEntrys attached to gfxFcFonts, there will be only one
// pattern in this array. This is always a font pattern, not a fully
// resolved pattern. gfxFcFont only uses this to construct a PangoFont.
//
// FontEntrys for src:local() fonts in gfxUserFontSet may return more than
// one pattern. (See comment in gfxUserFcFontEntry.)
const nsTArray< nsCountedRef<FcPattern> >& GetPatterns()
{
return mPatterns;
}
static gfxFcFontEntry *LookupFontEntry(cairo_font_face_t *aFace)
{
return static_cast<gfxFcFontEntry*>
(cairo_font_face_get_user_data(aFace, &sFontEntryKey));
}
// override the gfxFontEntry impl to read the name from fontconfig
// instead of trying to get the 'name' table, as we don't implement
// GetFontTable() here
virtual nsString RealFaceName();
// This is needed to make gfxFontEntry::HasCharacter(aCh) work.
virtual bool TestCharacterMap(uint32_t aCh)
{
for (uint32_t i = 0; i < mPatterns.Length(); ++i) {
if (HasChar(mPatterns[i], aCh)) {
return true;
}
}
return false;
}
protected:
explicit gfxFcFontEntry(const nsAString& aName)
: gfxFontEntry(aName)
{
}
// One pattern is the common case and some subclasses rely on successful
// addition of the first element to the array.
AutoFallibleTArray<nsCountedRef<FcPattern>,1> mPatterns;
static cairo_user_data_key_t sFontEntryKey;
};
cairo_user_data_key_t gfxFcFontEntry::sFontEntryKey;
nsString
gfxFcFontEntry::RealFaceName()
{
FcChar8 *name;
if (!mPatterns.IsEmpty()) {
if (FcPatternGetString(mPatterns[0],
FC_FULLNAME, 0, &name) == FcResultMatch) {
return NS_ConvertUTF8toUTF16((const char*)name);
}
if (FcPatternGetString(mPatterns[0],
FC_FAMILY, 0, &name) == FcResultMatch) {
NS_ConvertUTF8toUTF16 result((const char*)name);
if (FcPatternGetString(mPatterns[0],
FC_STYLE, 0, &name) == FcResultMatch) {
result.Append(' ');
AppendUTF8toUTF16((const char*)name, result);
}
return result;
}
}
// fall back to gfxFontEntry implementation (only works for sfnt fonts)
return gfxFontEntry::RealFaceName();
}
/**
* gfxSystemFcFontEntry:
*
* An implementation of gfxFcFontEntry used by gfxFcFonts for system fonts,
* including those from regular family-name based font selection as well as
* those from src:local().
*
* All gfxFcFonts using the same cairo_font_face_t share the same FontEntry.
*/
class gfxSystemFcFontEntry : public gfxFcFontEntry {
public:
// For memory efficiency, aFontPattern should be a font pattern,
// not a fully resolved pattern.
gfxSystemFcFontEntry(cairo_font_face_t *aFontFace,
FcPattern *aFontPattern,
const nsAString& aName)
: gfxFcFontEntry(aName), mFontFace(aFontFace),
mFTFace(nullptr), mFTFaceInitialized(false)
{
cairo_font_face_reference(mFontFace);
cairo_font_face_set_user_data(mFontFace, &sFontEntryKey, this, nullptr);
mPatterns.AppendElement();
// mPatterns is an nsAutoTArray with 1 space always available, so the
// AppendElement always succeeds.
mPatterns[0] = aFontPattern;
FcChar8 *name;
if (FcPatternGetString(aFontPattern,
FC_FAMILY, 0, &name) == FcResultMatch) {
mFamilyName = NS_ConvertUTF8toUTF16((const char*)name);
}
}
~gfxSystemFcFontEntry()
{
cairo_font_face_set_user_data(mFontFace,
&sFontEntryKey,
nullptr,
nullptr);
cairo_font_face_destroy(mFontFace);
}
virtual void ForgetHBFace();
virtual void ReleaseGrFace(gr_face* aFace);
protected:
virtual nsresult
CopyFontTable(uint32_t aTableTag, FallibleTArray<uint8_t>& aBuffer) MOZ_OVERRIDE;
void MaybeReleaseFTFace();
private:
cairo_font_face_t *mFontFace;
FT_Face mFTFace;
bool mFTFaceInitialized;
};
nsresult
gfxSystemFcFontEntry::CopyFontTable(uint32_t aTableTag,
FallibleTArray<uint8_t>& aBuffer)
{
if (!mFTFaceInitialized) {
mFTFaceInitialized = true;
FcChar8 *filename;
if (FcPatternGetString(mPatterns[0], FC_FILE, 0, &filename) != FcResultMatch) {
return NS_ERROR_FAILURE;
}
int index;
if (FcPatternGetInteger(mPatterns[0], FC_INDEX, 0, &index) != FcResultMatch) {
index = 0; // default to 0 if not found in pattern
}
if (FT_New_Face(gfxPangoFontGroup::GetFTLibrary(),
(const char*)filename, index, &mFTFace) != 0) {
return NS_ERROR_FAILURE;
}
}
if (!mFTFace) {
return NS_ERROR_NOT_AVAILABLE;
}
FT_ULong length = 0;
if (FT_Load_Sfnt_Table(mFTFace, aTableTag, 0, nullptr, &length) != 0) {
return NS_ERROR_NOT_AVAILABLE;
}
if (!aBuffer.SetLength(length)) {
return NS_ERROR_OUT_OF_MEMORY;
}
if (FT_Load_Sfnt_Table(mFTFace, aTableTag, 0, aBuffer.Elements(), &length) != 0) {
aBuffer.Clear();
return NS_ERROR_FAILURE;
}
return NS_OK;
}
void
gfxSystemFcFontEntry::MaybeReleaseFTFace()
{
// don't release if either HB or Gr face still exists
if (mHBFace || mGrFace) {
return;
}
if (mFTFace) {
FT_Done_Face(mFTFace);
mFTFace = nullptr;
}
mFTFaceInitialized = false;
}
void
gfxSystemFcFontEntry::ForgetHBFace()
{
gfxFontEntry::ForgetHBFace();
MaybeReleaseFTFace();
}
void
gfxSystemFcFontEntry::ReleaseGrFace(gr_face* aFace)
{
gfxFontEntry::ReleaseGrFace(aFace);
MaybeReleaseFTFace();
}
// A namespace for @font-face family names in FcPatterns so that fontconfig
// aliases do not pick up families from @font-face rules and so that
// fontconfig rules can distinguish between web fonts and platform fonts.
// http://lists.freedesktop.org/archives/fontconfig/2008-November/003037.html
#define FONT_FACE_FAMILY_PREFIX "@font-face:"
/**
* gfxUserFcFontEntry:
*
* An abstract class for objects in a gfxUserFontSet that can provide
* FcPattern* handles to fonts.
*
* Separate implementations of this class support local fonts from src:local()
* and web fonts from src:url().
*/
// There is a one-to-one correspondence between gfxUserFcFontEntry objects and
// @font-face rules, but sometimes a one-to-many correspondence between font
// entries and font patterns.
//
// http://www.w3.org/TR/2002/WD-css3-webfonts-20020802#font-descriptions
// provided a font-size descriptor to specify the sizes supported by the face,
// but the "Editor's Draft 27 June 2008"
// http://dev.w3.org/csswg/css3-fonts/#font-resources does not provide such a
// descriptor, and Mozilla does not recognize such a descriptor.
//
// Font face names used in src:local() also do not usually specify a size.
//
// PCF format fonts have each size in a different file, and each of these
// files is referenced by its own pattern, but really these are each
// different sizes of one face with one name.
//
// Multiple patterns in an entry also effectively deals with a set of
// PostScript Type 1 font files that all have the same face name but are in
// several files because of the limit on the number of glyphs in a Type 1 font
// file. (e.g. Computer Modern.)
class gfxUserFcFontEntry : public gfxFcFontEntry {
protected:
explicit gfxUserFcFontEntry(const nsAString& aFontName,
uint16_t aWeight,
int16_t aStretch,
bool aItalic)
: gfxFcFontEntry(aFontName)
{
mItalic = aItalic;
mWeight = aWeight;
mStretch = aStretch;
}
// Helper function to change a pattern so that it matches the CSS style
// descriptors and so gets properly sorted in font selection. This also
// avoids synthetic style effects being added by the renderer when the
// style of the font itself does not match the descriptor provided by the
// author.
void AdjustPatternToCSS(FcPattern *aPattern);
};
void
gfxUserFcFontEntry::AdjustPatternToCSS(FcPattern *aPattern)
{
int fontWeight = -1;
FcPatternGetInteger(aPattern, FC_WEIGHT, 0, &fontWeight);
int cssWeight = gfxFontconfigUtils::FcWeightForBaseWeight(mWeight / 100);
if (cssWeight != fontWeight) {
FcPatternDel(aPattern, FC_WEIGHT);
FcPatternAddInteger(aPattern, FC_WEIGHT, cssWeight);
}
int fontSlant;
FcResult res = FcPatternGetInteger(aPattern, FC_SLANT, 0, &fontSlant);
// gfxFontEntry doesn't understand the difference between oblique
// and italic.
if (res != FcResultMatch ||
IsItalic() != (fontSlant != FC_SLANT_ROMAN)) {
FcPatternDel(aPattern, FC_SLANT);
FcPatternAddInteger(aPattern, FC_SLANT,
IsItalic() ? FC_SLANT_OBLIQUE : FC_SLANT_ROMAN);
}
int fontWidth = -1;
FcPatternGetInteger(aPattern, FC_WIDTH, 0, &fontWidth);
int cssWidth = gfxFontconfigUtils::FcWidthForThebesStretch(mStretch);
if (cssWidth != fontWidth) {
FcPatternDel(aPattern, FC_WIDTH);
FcPatternAddInteger(aPattern, FC_WIDTH, cssWidth);
}
// Ensure that there is a fullname property (if there is a family
// property) so that fontconfig rules can identify the real name of the
// font, because the family property will be replaced.
FcChar8 *unused;
if (FcPatternGetString(aPattern,
FC_FULLNAME, 0, &unused) == FcResultNoMatch) {
nsAutoCString fullname;
if (gfxFontconfigUtils::GetFullnameFromFamilyAndStyle(aPattern,
&fullname)) {
FcPatternAddString(aPattern, FC_FULLNAME,
gfxFontconfigUtils::ToFcChar8(fullname));
}
}
nsAutoCString family;
family.Append(FONT_FACE_FAMILY_PREFIX);
AppendUTF16toUTF8(Name(), family);
FcPatternDel(aPattern, FC_FAMILY);
FcPatternDel(aPattern, FC_FAMILYLANG);
FcPatternAddString(aPattern, FC_FAMILY,
gfxFontconfigUtils::ToFcChar8(family));
}
/**
* gfxLocalFcFontEntry:
*
* An implementation of gfxUserFcFontEntry for local fonts from src:local().
*
* This class is used only in gfxUserFontSet and for providing FcPattern*
* handles to system fonts for font selection. gfxFcFonts created from these
* patterns will use gfxSystemFcFontEntrys, which may be shared with
* gfxFcFonts from regular family-name based font selection.
*/
class gfxLocalFcFontEntry : public gfxUserFcFontEntry {
public:
gfxLocalFcFontEntry(const nsAString& aFontName,
uint16_t aWeight,
int16_t aStretch,
bool aItalic,
const nsTArray< nsCountedRef<FcPattern> >& aPatterns)
: gfxUserFcFontEntry(aFontName, aWeight, aStretch, aItalic)
{
if (!mPatterns.SetCapacity(aPatterns.Length()))
return; // OOM
for (uint32_t i = 0; i < aPatterns.Length(); ++i) {
FcPattern *pattern = FcPatternDuplicate(aPatterns.ElementAt(i));
if (!pattern)
return; // OOM
AdjustPatternToCSS(pattern);
mPatterns.AppendElement();
mPatterns[i].own(pattern);
}
mIsLocalUserFont = true;
}
};
/**
* gfxDownloadedFcFontEntry:
*
* An implementation of gfxFcFontEntry for web fonts from src:url().
*
* When a cairo_font_face_t is created for these fonts, the cairo_font_face_t
* keeps a reference to the FontEntry to keep the font data alive.
*/
class gfxDownloadedFcFontEntry : public gfxUserFcFontEntry {
public:
// This takes ownership of the face and its underlying data
gfxDownloadedFcFontEntry(const nsAString& aFontName,
uint16_t aWeight,
int16_t aStretch,
bool aItalic,
const uint8_t *aData, FT_Face aFace)
: gfxUserFcFontEntry(aFontName, aWeight, aStretch, aItalic),
mFontData(aData), mFace(aFace)
{
NS_PRECONDITION(aFace != nullptr, "aFace is NULL!");
mIsDataUserFont = true;
InitPattern();
}
virtual ~gfxDownloadedFcFontEntry();
// Returns true on success
bool SetCairoFace(cairo_font_face_t *aFace);
virtual hb_blob_t* GetFontTable(uint32_t aTableTag) MOZ_OVERRIDE;
protected:
void InitPattern();
// mFontData holds the data used to instantiate the FT_Face;
// this has to persist until we are finished with the face,
// then be released with NS_Free().
const uint8_t* mFontData;
FT_Face mFace;
};
// A property for recording gfxDownloadedFcFontEntrys on FcPatterns.
static const char *kFontEntryFcProp = "-moz-font-entry";
static FcBool AddDownloadedFontEntry(FcPattern *aPattern,
gfxDownloadedFcFontEntry *aFontEntry)
{
FcValue value;
value.type = FcTypeFTFace; // void* field of union
value.u.f = aFontEntry;
return FcPatternAdd(aPattern, kFontEntryFcProp, value, FcFalse);
}
static FcBool DelDownloadedFontEntry(FcPattern *aPattern)
{
return FcPatternDel(aPattern, kFontEntryFcProp);
}
static gfxDownloadedFcFontEntry *GetDownloadedFontEntry(FcPattern *aPattern)
{
FcValue value;
if (FcPatternGet(aPattern, kFontEntryFcProp, 0, &value) != FcResultMatch)
return nullptr;
if (value.type != FcTypeFTFace) {
NS_NOTREACHED("Wrong type for -moz-font-entry font property");
return nullptr;
}
return static_cast<gfxDownloadedFcFontEntry*>(value.u.f);
}
gfxDownloadedFcFontEntry::~gfxDownloadedFcFontEntry()
{
if (mPatterns.Length() != 0) {
// Remove back reference to this font entry and the face in case
// anyone holds a reference to the pattern.
NS_ASSERTION(mPatterns.Length() == 1,
"More than one pattern in gfxDownloadedFcFontEntry!");
DelDownloadedFontEntry(mPatterns[0]);
FcPatternDel(mPatterns[0], FC_FT_FACE);
}
FT_Done_Face(mFace);
NS_Free((void*)mFontData);
}
typedef FcPattern* (*QueryFaceFunction)(const FT_Face face,
const FcChar8 *file, int id,
FcBlanks *blanks);
void
gfxDownloadedFcFontEntry::InitPattern()
{
static QueryFaceFunction sQueryFacePtr =
reinterpret_cast<QueryFaceFunction>
(FindFunctionSymbol("FcFreeTypeQueryFace"));
FcPattern *pattern;
// FcFreeTypeQueryFace is the same function used to construct patterns for
// system fonts and so is the preferred function to use for this purpose.
// This will set up the langset property, which helps with sorting, and
// the foundry, fullname, and fontversion properties, which properly
// identify the font to fontconfig rules. However, FcFreeTypeQueryFace is
// available only from fontconfig-2.4.2 (December 2006). (CentOS 5.0 has
// fontconfig-2.4.1.)
if (sQueryFacePtr) {
// The "file" argument cannot be nullptr (in fontconfig-2.6.0 at
// least). The dummy file passed here is removed below.
//
// When fontconfig scans the system fonts, FcConfigGetBlanks(nullptr)
// is passed as the "blanks" argument, which provides that unexpectedly
// blank glyphs are elided. Here, however, we pass nullptr for
// "blanks", effectively assuming that, if the font has a blank glyph,
// then the author intends any associated character to be rendered
// blank.
pattern =
(*sQueryFacePtr)(mFace,
gfxFontconfigUtils::ToFcChar8(""),
0,
nullptr);
if (!pattern)
// Either OOM, or fontconfig chose to skip this font because it
// has "no encoded characters", which I think means "BDF and PCF
// fonts which are not in Unicode (or the effectively equivalent
// ISO Latin-1) encoding".
return;
// These properties don't make sense for this face without a file.
FcPatternDel(pattern, FC_FILE);
FcPatternDel(pattern, FC_INDEX);
} else {
// Do the minimum necessary to construct a pattern for sorting.
// FC_CHARSET is vital to determine which characters are supported.
nsAutoRef<FcCharSet> charset(FcFreeTypeCharSet(mFace, nullptr));
// If there are no characters then assume we don't know how to read
// this font.
if (!charset || FcCharSetCount(charset) == 0)
return;
pattern = FcPatternCreate();
FcPatternAddCharSet(pattern, FC_CHARSET, charset);
// FC_PIXEL_SIZE can be important for font selection of fixed-size
// fonts.
if (!(mFace->face_flags & FT_FACE_FLAG_SCALABLE)) {
for (FT_Int i = 0; i < mFace->num_fixed_sizes; ++i) {
#if HAVE_FT_BITMAP_SIZE_Y_PPEM
double size = FLOAT_FROM_26_6(mFace->available_sizes[i].y_ppem);
#else
double size = mFace->available_sizes[i].height;
#endif
FcPatternAddDouble (pattern, FC_PIXEL_SIZE, size);
}
// Not sure whether this is important;
// imitating FcFreeTypeQueryFace:
FcPatternAddBool (pattern, FC_ANTIALIAS, FcFalse);
}
// Setting up the FC_LANGSET property is very difficult with the APIs
// available prior to FcFreeTypeQueryFace. Having no FC_LANGSET
// property seems better than having a property with an empty LangSet.
// With no FC_LANGSET property, fontconfig sort functions will
// consider this face to have the same priority as (otherwise equal)
// faces that have support for the primary requested language, but
// will not consider any language to have been satisfied (and so will
// continue to look for a face with language support in fallback
// fonts).
}
AdjustPatternToCSS(pattern);
FcPatternAddFTFace(pattern, FC_FT_FACE, mFace);
AddDownloadedFontEntry(pattern, this);
// There is never more than one pattern
mPatterns.AppendElement();
mPatterns[0].own(pattern);
}
static void ReleaseDownloadedFontEntry(void *data)
{
gfxDownloadedFcFontEntry *downloadedFontEntry =
static_cast<gfxDownloadedFcFontEntry*>(data);
NS_RELEASE(downloadedFontEntry);
}
bool gfxDownloadedFcFontEntry::SetCairoFace(cairo_font_face_t *aFace)
{
if (CAIRO_STATUS_SUCCESS !=
cairo_font_face_set_user_data(aFace, &sFontEntryKey, this,
ReleaseDownloadedFontEntry))
return false;
// Hold a reference to this font entry to keep the font face data.
NS_ADDREF(this);
return true;
}
hb_blob_t *
gfxDownloadedFcFontEntry::GetFontTable(uint32_t aTableTag)
{
// The entry already owns the (sanitized) sfnt data in mFontData,
// so we can just return a blob that "wraps" the appropriate chunk of it.
// The blob should not attempt to free its data, as the entire sfnt data
// will be freed when the font entry is deleted.
return GetTableFromFontData(mFontData, aTableTag);
}
/*
* gfxFcFont
*
* This is a gfxFont implementation using a CAIRO_FONT_TYPE_FT
* cairo_scaled_font created from an FcPattern.
*/
class gfxFcFont : public gfxFT2FontBase {
public:
virtual ~gfxFcFont();
static already_AddRefed<gfxFcFont>
GetOrMakeFont(FcPattern *aRequestedPattern, FcPattern *aFontPattern,
const gfxFontStyle *aFontStyle);
#ifdef USE_SKIA
virtual mozilla::TemporaryRef<mozilla::gfx::GlyphRenderingOptions>
GetGlyphRenderingOptions(const TextRunDrawParams* aRunParams = nullptr) MOZ_OVERRIDE;
#endif
// return a cloned font resized and offset to simulate sub/superscript glyphs
virtual already_AddRefed<gfxFont>
GetSubSuperscriptFont(int32_t aAppUnitsPerDevPixel);
protected:
virtual already_AddRefed<gfxFont> MakeScaledFont(gfxFontStyle *aFontStyle,
gfxFloat aFontScale);
virtual already_AddRefed<gfxFont> GetSmallCapsFont();
private:
gfxFcFont(cairo_scaled_font_t *aCairoFont, gfxFcFontEntry *aFontEntry,
const gfxFontStyle *aFontStyle);
// key for locating a gfxFcFont corresponding to a cairo_scaled_font
static cairo_user_data_key_t sGfxFontKey;
};
/**
* gfxFcFontSet:
*
* Translation from a desired FcPattern to a sorted set of font references
* (fontconfig cache data) and (when needed) fonts.
*/
class gfxFcFontSet MOZ_FINAL {
public:
NS_INLINE_DECL_REFCOUNTING(gfxFcFontSet)
explicit gfxFcFontSet(FcPattern *aPattern,
gfxUserFontSet *aUserFontSet)
: mSortPattern(aPattern), mUserFontSet(aUserFontSet),
mFcFontsTrimmed(0),
mHaveFallbackFonts(false)
{
bool waitForUserFont;
mFcFontSet = SortPreferredFonts(waitForUserFont);
mWaitingForUserFont = waitForUserFont;
}
// A reference is held by the FontSet.
// The caller may add a ref to keep the font alive longer than the FontSet.
gfxFcFont *GetFontAt(uint32_t i, const gfxFontStyle *aFontStyle)
{
if (i >= mFonts.Length() || !mFonts[i].mFont) {
// GetFontPatternAt sets up mFonts
FcPattern *fontPattern = GetFontPatternAt(i);
if (!fontPattern)
return nullptr;
mFonts[i].mFont =
gfxFcFont::GetOrMakeFont(mSortPattern, fontPattern,
aFontStyle);
}
return mFonts[i].mFont;
}
FcPattern *GetFontPatternAt(uint32_t i);
bool WaitingForUserFont() const {
return mWaitingForUserFont;
}
private:
// Private destructor, to discourage deletion outside of Release():
~gfxFcFontSet()
{
}
nsReturnRef<FcFontSet> SortPreferredFonts(bool& aWaitForUserFont);
nsReturnRef<FcFontSet> SortFallbackFonts();
struct FontEntry {
explicit FontEntry(FcPattern *aPattern) : mPattern(aPattern) {}
nsCountedRef<FcPattern> mPattern;
nsRefPtr<gfxFcFont> mFont;
};
struct LangSupportEntry {
LangSupportEntry(FcChar8 *aLang, FcLangResult aSupport) :
mLang(aLang), mBestSupport(aSupport) {}
FcChar8 *mLang;
FcLangResult mBestSupport;
};
public:
// public for nsTArray
class LangComparator {
public:
bool Equals(const LangSupportEntry& a, const FcChar8 *b) const
{
return FcStrCmpIgnoreCase(a.mLang, b) == 0;
}
};
private:
// The requested pattern
nsCountedRef<FcPattern> mSortPattern;
// Fonts from @font-face rules
nsRefPtr<gfxUserFontSet> mUserFontSet;
// A (trimmed) list of font patterns and fonts that is built up as
// required.
nsTArray<FontEntry> mFonts;
// Holds a list of font patterns that will be trimmed. This is first set
// to a list of preferred fonts. Then, if/when all the preferred fonts
// have been trimmed and added to mFonts, this is set to a list of
// fallback fonts.
nsAutoRef<FcFontSet> mFcFontSet;
// The set of characters supported by the fonts in mFonts.
nsAutoRef<FcCharSet> mCharSet;
// The index of the next font in mFcFontSet that has not yet been
// considered for mFonts.
int mFcFontsTrimmed;
// True iff fallback fonts are either stored in mFcFontSet or have been
// trimmed and added to mFonts (so that mFcFontSet is nullptr).
bool mHaveFallbackFonts;
// True iff there was a user font set with pending downloads,
// so the set may be updated when downloads complete
bool mWaitingForUserFont;
};
// Find the FcPattern for an @font-face font suitable for CSS family |aFamily|
// and style |aStyle| properties.
static const nsTArray< nsCountedRef<FcPattern> >*
FindFontPatterns(gfxUserFontSet *mUserFontSet,
const nsACString &aFamily, uint8_t aStyle,
uint16_t aWeight, int16_t aStretch,
bool& aWaitForUserFont)
{
// Convert to UTF16
NS_ConvertUTF8toUTF16 utf16Family(aFamily);
// needsBold is not used here. Instead synthetic bold is enabled through
// FcFontRenderPrepare when the weight in the requested pattern is
// compared against the weight in the font pattern.
bool needsBold;
gfxFontStyle style;
style.style = aStyle;
style.weight = aWeight;
style.stretch = aStretch;
gfxUserFcFontEntry *fontEntry = nullptr;
gfxFontFamily *family = mUserFontSet->LookupFamily(utf16Family);
if (family) {
gfxUserFontEntry* userFontEntry =
mUserFontSet->FindUserFontEntryAndLoad(family, style, needsBold,
aWaitForUserFont);
if (userFontEntry) {
fontEntry = static_cast<gfxUserFcFontEntry*>
(userFontEntry->GetPlatformFontEntry());
}
// Accept synthetic oblique for italic and oblique.
// xxx - this isn't really ideal behavior, for docs that only use a
// single italic face it will also pull down the normal face
// and probably never use it
if (!fontEntry && aStyle != NS_FONT_STYLE_NORMAL) {
style.style = NS_FONT_STYLE_NORMAL;
userFontEntry =
mUserFontSet->FindUserFontEntryAndLoad(family, style,
needsBold,
aWaitForUserFont);
if (userFontEntry) {
fontEntry = static_cast<gfxUserFcFontEntry*>
(userFontEntry->GetPlatformFontEntry());
}
}
}
if (!fontEntry) {
return nullptr;
}
return &fontEntry->GetPatterns();
}
typedef FcBool (*FcPatternRemoveFunction)(FcPattern *p, const char *object,
int id);
// FcPatternRemove is available in fontconfig-2.3.0 (2005)
static FcBool
moz_FcPatternRemove(FcPattern *p, const char *object, int id)
{
static FcPatternRemoveFunction sFcPatternRemovePtr =
reinterpret_cast<FcPatternRemoveFunction>
(FindFunctionSymbol("FcPatternRemove"));
if (!sFcPatternRemovePtr)
return FcFalse;
return (*sFcPatternRemovePtr)(p, object, id);
}
// fontconfig prefers a matching family or lang to pixelsize of bitmap
// fonts. CSS suggests a tolerance of 20% on pixelsize.
static bool
SizeIsAcceptable(FcPattern *aFont, double aRequestedSize)
{
double size;
int v = 0;
while (FcPatternGetDouble(aFont,
FC_PIXEL_SIZE, v, &size) == FcResultMatch) {
++v;
if (5.0 * fabs(size - aRequestedSize) < aRequestedSize)
return true;
}
// No size means scalable
return v == 0;
}
// Sorting only the preferred fonts first usually saves having to sort through
// every font on the system.
nsReturnRef<FcFontSet>
gfxFcFontSet::SortPreferredFonts(bool &aWaitForUserFont)
{
aWaitForUserFont = false;
gfxFontconfigUtils *utils = gfxFontconfigUtils::GetFontconfigUtils();
if (!utils)
return nsReturnRef<FcFontSet>();
// The list of families in mSortPattern has values with both weak and
// strong bindings. Values with strong bindings should be preferred.
// Values with weak bindings are default fonts that should be considered
// only when the font provides the best support for a requested language
// or after other fonts have satisfied all the requested languages.
//
// There are no direct fontconfig APIs to get the binding type. The
// binding only takes effect in the sort and match functions.
// |requiredLangs| is a list of requested languages that have not yet been
// satisfied. gfxFontconfigUtils only sets one FC_LANG property value,
// but FcConfigSubstitute may add more values (e.g. prepending "en" to
// "ja" will use western fonts to render Latin/Arabic numerals in Japanese
// text.)
nsAutoTArray<LangSupportEntry,10> requiredLangs;
for (int v = 0; ; ++v) {
FcChar8 *lang;
FcResult result = FcPatternGetString(mSortPattern, FC_LANG, v, &lang);
if (result != FcResultMatch) {
// No need to check FcPatternGetLangSet() because
// gfxFontconfigUtils sets only a string value for FC_LANG and
// FcConfigSubstitute cannot add LangSets.
NS_ASSERTION(result != FcResultTypeMismatch,
"Expected a string for FC_LANG");
break;
}
if (!requiredLangs.Contains(lang, LangComparator())) {
FcLangResult bestLangSupport = utils->GetBestLangSupport(lang);
if (bestLangSupport != FcLangDifferentLang) {
requiredLangs.
AppendElement(LangSupportEntry(lang, bestLangSupport));
}
}
}
nsAutoRef<FcFontSet> fontSet(FcFontSetCreate());
if (!fontSet)
return fontSet.out();
// FcDefaultSubstitute() ensures a slant on mSortPattern, but, if that ever
// doesn't happen, Roman will be used.
int requestedSlant = FC_SLANT_ROMAN;
FcPatternGetInteger(mSortPattern, FC_SLANT, 0, &requestedSlant);
double requestedSize = -1.0;
FcPatternGetDouble(mSortPattern, FC_PIXEL_SIZE, 0, &requestedSize);
nsTHashtable<gfxFontconfigUtils::DepFcStrEntry> existingFamilies(32);
FcChar8 *family;
for (int v = 0;
FcPatternGetString(mSortPattern,
FC_FAMILY, v, &family) == FcResultMatch; ++v) {
const nsTArray< nsCountedRef<FcPattern> > *familyFonts = nullptr;
// Is this an @font-face family?
bool isUserFont = false;
if (mUserFontSet) {
// Have some @font-face definitions
nsDependentCString cFamily(gfxFontconfigUtils::ToCString(family));
NS_NAMED_LITERAL_CSTRING(userPrefix, FONT_FACE_FAMILY_PREFIX);
if (StringBeginsWith(cFamily, userPrefix)) {
isUserFont = true;
// Trim off the prefix
nsDependentCSubstring cssFamily(cFamily, userPrefix.Length());
uint8_t thebesStyle =
gfxFontconfigUtils::FcSlantToThebesStyle(requestedSlant);
uint16_t thebesWeight =
gfxFontconfigUtils::GetThebesWeight(mSortPattern);
int16_t thebesStretch =
gfxFontconfigUtils::GetThebesStretch(mSortPattern);
bool waitForUserFont;
familyFonts = FindFontPatterns(mUserFontSet, cssFamily,
thebesStyle,
thebesWeight, thebesStretch,
waitForUserFont);
if (waitForUserFont) {
aWaitForUserFont = true;
}
}
}
if (!isUserFont) {
familyFonts = &utils->GetFontsForFamily(family);
}
if (!familyFonts || familyFonts->Length() == 0) {
// There are no fonts matching this family, so there is no point
// in searching for this family in the FontSort.
//
// Perhaps the original pattern should be retained for
// FcFontRenderPrepare. However, the only a useful config
// substitution test against missing families that i can imagine
// would only be interested in the preferred family
// (qual="first"), so always keep the first family and use the
// same pattern for Sort and RenderPrepare.
if (v != 0 && moz_FcPatternRemove(mSortPattern, FC_FAMILY, v)) {
--v;
}
continue;
}
// Aliases seem to often end up occurring more than once, but
// duplicate families can't be removed from the sort pattern without
// knowing whether duplicates have the same binding.
gfxFontconfigUtils::DepFcStrEntry *entry =
existingFamilies.PutEntry(family);
if (entry) {
if (entry->mKey) // old entry
continue;
entry->mKey = family; // initialize new entry
}
for (uint32_t f = 0; f < familyFonts->Length(); ++f) {
FcPattern *font = familyFonts->ElementAt(f);
// Fix up the family name of user-font patterns, as the same
// font entry may be used (via the UserFontCache) for multiple
// CSS family names
if (isUserFont) {
font = FcPatternDuplicate(font);
FcPatternDel(font, FC_FAMILY);
FcPatternAddString(font, FC_FAMILY, family);
}
// User fonts are already filtered by slant (but not size) in
// mUserFontSet->FindUserFontEntry().
if (requestedSize != -1.0 && !SizeIsAcceptable(font, requestedSize))
continue;
for (uint32_t r = 0; r < requiredLangs.Length(); ++r) {
const LangSupportEntry& entry = requiredLangs[r];
FcLangResult support =
gfxFontconfigUtils::GetLangSupport(font, entry.mLang);
if (support <= entry.mBestSupport) { // lower is better
requiredLangs.RemoveElementAt(r);
--r;
}
}
// FcFontSetDestroy will remove a reference but FcFontSetAdd
// does _not_ take a reference!
if (FcFontSetAdd(fontSet, font)) {
// We don't add a reference here for user fonts, because we're
// using a local clone of the pattern (see above) in order to
// override the family name
if (!isUserFont) {
FcPatternReference(font);
}
}
}
}
FcPattern *truncateMarker = nullptr;
for (uint32_t r = 0; r < requiredLangs.Length(); ++r) {
const nsTArray< nsCountedRef<FcPattern> >& langFonts =
utils->GetFontsForLang(requiredLangs[r].mLang);
bool haveLangFont = false;
for (uint32_t f = 0; f < langFonts.Length(); ++f) {
FcPattern *font = langFonts[f];
if (requestedSize != -1.0 && !SizeIsAcceptable(font, requestedSize))
continue;
haveLangFont = true;
if (FcFontSetAdd(fontSet, font)) {
FcPatternReference(font);
}
}
if (!haveLangFont && langFonts.Length() > 0) {
// There is a font that supports this language but it didn't pass
// the slant and size criteria. Weak default font families should
// not be considered until the language has been satisfied.
//
// Insert a font that supports the language so that it will mark
// the position of fonts from weak families in the sorted set and
// they can be removed. The language and weak families will be
// considered in the fallback fonts, which use fontconfig's
// algorithm.
//
// Of the fonts that don't meet slant and size criteria, strong
// default font families should be considered before (other) fonts
// for this language, so this marker font will be removed (as well
// as the fonts from weak families), and strong families will be
// reconsidered in the fallback fonts.
FcPattern *font = langFonts[0];
if (FcFontSetAdd(fontSet, font)) {
FcPatternReference(font);
truncateMarker = font;
}
break;
}
}
FcFontSet *sets[1] = { fontSet };
FcResult result;
#ifdef SOLARIS
// Get around a crash of FcFontSetSort when FcConfig is nullptr
// Solaris's FcFontSetSort needs an FcConfig (bug 474758)
fontSet.own(FcFontSetSort(FcConfigGetCurrent(), sets, 1, mSortPattern,
FcFalse, nullptr, &result));
#else
fontSet.own(FcFontSetSort(nullptr, sets, 1, mSortPattern,
FcFalse, nullptr, &result));
#endif
if (truncateMarker != nullptr && fontSet) {
nsAutoRef<FcFontSet> truncatedSet(FcFontSetCreate());
for (int f = 0; f < fontSet->nfont; ++f) {
FcPattern *font = fontSet->fonts[f];
if (font == truncateMarker)
break;
if (FcFontSetAdd(truncatedSet, font)) {
FcPatternReference(font);
}
}
fontSet.steal(truncatedSet);
}
return fontSet.out();
}
nsReturnRef<FcFontSet>
gfxFcFontSet::SortFallbackFonts()
{
// Setting trim to FcTrue would provide a much smaller (~ 1/10) FcFontSet,
// but would take much longer due to comparing all the character sets.
//
// The references to fonts in this FcFontSet are almost free
// as they are pointers into mmaped cache files.
//
// GetFontPatternAt() will trim lazily if and as needed, which will also
// remove duplicates of preferred fonts.
FcResult result;
return nsReturnRef<FcFontSet>(FcFontSort(nullptr, mSortPattern,
FcFalse, nullptr, &result));
}
// GetFontAt relies on this setting up all patterns up to |i|.
FcPattern *
gfxFcFontSet::GetFontPatternAt(uint32_t i)
{
while (i >= mFonts.Length()) {
while (!mFcFontSet) {
if (mHaveFallbackFonts)
return nullptr;
mFcFontSet = SortFallbackFonts();
mHaveFallbackFonts = true;
mFcFontsTrimmed = 0;
// Loop to test that mFcFontSet is non-nullptr.
}
while (mFcFontsTrimmed < mFcFontSet->nfont) {
FcPattern *font = mFcFontSet->fonts[mFcFontsTrimmed];
++mFcFontsTrimmed;
if (mFonts.Length() != 0) {
// See if the next font provides support for any extra
// characters. Most often the next font is not going to
// support more characters so check for a SubSet first before
// allocating a new CharSet with Union.
FcCharSet *supportedChars = mCharSet;
if (!supportedChars) {
FcPatternGetCharSet(mFonts[mFonts.Length() - 1].mPattern,
FC_CHARSET, 0, &supportedChars);
}
if (supportedChars) {
FcCharSet *newChars = nullptr;
FcPatternGetCharSet(font, FC_CHARSET, 0, &newChars);
if (newChars) {
if (FcCharSetIsSubset(newChars, supportedChars))
continue;
mCharSet.own(FcCharSetUnion(supportedChars, newChars));
} else if (!mCharSet) {
mCharSet.own(FcCharSetCopy(supportedChars));
}
}
}
mFonts.AppendElement(font);
if (mFonts.Length() >= i)
break;
}
if (mFcFontsTrimmed == mFcFontSet->nfont) {
// finished with this font set
mFcFontSet.reset();
}
}
return mFonts[i].mPattern;
}
#ifdef MOZ_WIDGET_GTK
static void ApplyGdkScreenFontOptions(FcPattern *aPattern);
#endif
// Apply user settings and defaults to pattern in preparation for matching.
static void
PrepareSortPattern(FcPattern *aPattern, double aFallbackSize,
double aSizeAdjustFactor, bool aIsPrinterFont)
{
FcConfigSubstitute(nullptr, aPattern, FcMatchPattern);
// This gets cairo_font_options_t for the Screen. We should have
// different font options for printing (no hinting) but we are not told
// what we are measuring for.
//
// If cairo adds support for lcd_filter, gdk will not provide the default
// setting for that option. We could get the default setting by creating
// an xlib surface once, recording its font_options, and then merging the
// gdk options.
//
// Using an xlib surface would also be an option to get Screen font
// options for non-GTK X11 toolkits, but less efficient than using GDK to
// pick up dynamic changes.
if(aIsPrinterFont) {
cairo_font_options_t *options = cairo_font_options_create();
cairo_font_options_set_hint_style (options, CAIRO_HINT_STYLE_NONE);
cairo_font_options_set_antialias (options, CAIRO_ANTIALIAS_GRAY);
cairo_ft_font_options_substitute(options, aPattern);
cairo_font_options_destroy(options);
FcPatternAddBool(aPattern, PRINTING_FC_PROPERTY, FcTrue);
} else {
#ifdef MOZ_WIDGET_GTK
ApplyGdkScreenFontOptions(aPattern);
#endif
}
// Protect against any fontconfig settings that may have incorrectly
// modified the pixelsize, and consider aSizeAdjustFactor.
double size = aFallbackSize;
if (FcPatternGetDouble(aPattern, FC_PIXEL_SIZE, 0, &size) != FcResultMatch
|| aSizeAdjustFactor != 1.0) {
FcPatternDel(aPattern, FC_PIXEL_SIZE);
FcPatternAddDouble(aPattern, FC_PIXEL_SIZE, size * aSizeAdjustFactor);
}
FcDefaultSubstitute(aPattern);
}
/**
** gfxPangoFontGroup
**/
gfxPangoFontGroup::gfxPangoFontGroup(const FontFamilyList& aFontFamilyList,
const gfxFontStyle *aStyle,
gfxUserFontSet *aUserFontSet)
: gfxFontGroup(aFontFamilyList, aStyle, aUserFontSet),
mPangoLanguage(GuessPangoLanguage(aStyle->language))
{
// This language is passed to the font for shaping.
// Shaping doesn't know about lang groups so make it a real language.
if (mPangoLanguage) {
mStyle.language = do_GetAtom(pango_language_to_string(mPangoLanguage));
}
// dummy entry, will be replaced when actually needed
mFonts.AppendElement(FamilyFace());
}
gfxPangoFontGroup::~gfxPangoFontGroup()
{
}
gfxFontGroup *
gfxPangoFontGroup::Copy(const gfxFontStyle *aStyle)
{
return new gfxPangoFontGroup(mFamilyList, aStyle, mUserFontSet);
}
void
gfxPangoFontGroup::FindPlatformFont(const nsAString& fontName,
bool aUseFontSet,
void *aClosure)
{
nsTArray<nsString> *list = static_cast<nsTArray<nsString>*>(aClosure);
if (!list->Contains(fontName)) {
// names present in the user fontset are not matched against system fonts
if (aUseFontSet && mUserFontSet && mUserFontSet->HasFamily(fontName)) {
nsAutoString userFontName =
NS_LITERAL_STRING(FONT_FACE_FAMILY_PREFIX) + fontName;
list->AppendElement(userFontName);
} else {
list->AppendElement(fontName);
}
}
}
gfxFcFont *
gfxPangoFontGroup::GetBaseFont()
{
if (mFonts[0].Font() == nullptr) {
gfxFont* font = GetBaseFontSet()->GetFontAt(0, GetStyle());
mFonts[0] = FamilyFace(nullptr, font);
}
return static_cast<gfxFcFont*>(mFonts[0].Font());
}
gfxFont*
gfxPangoFontGroup::GetFirstValidFont(uint32_t aCh)
{
return GetFontAt(0);
}
gfxFont *
gfxPangoFontGroup::GetFontAt(int32_t i, uint32_t aCh)
{
// If it turns out to be hard for all clients that cache font
// groups to call UpdateUserFonts at appropriate times, we could
// instead consider just calling UpdateUserFonts from someplace
// more central (such as here).
NS_ASSERTION(!mUserFontSet || mCurrGeneration == GetGeneration(),
"Whoever was caching this font group should have "
"called UpdateUserFonts on it");
NS_PRECONDITION(i == 0, "Only have one font");
return GetBaseFont();
}
void
gfxPangoFontGroup::UpdateUserFonts()
{
uint64_t newGeneration = GetGeneration();
if (newGeneration == mCurrGeneration)
return;
mFonts[0] = FamilyFace();
mFontSets.Clear();
mCachedEllipsisTextRun = nullptr;
mUnderlineOffset = UNDERLINE_OFFSET_NOT_SET;
mCurrGeneration = newGeneration;
mSkipDrawing = false;
}
already_AddRefed<gfxFcFontSet>
gfxPangoFontGroup::MakeFontSet(PangoLanguage *aLang, gfxFloat aSizeAdjustFactor,
nsAutoRef<FcPattern> *aMatchPattern)
{
const char *lang = pango_language_to_string(aLang);
nsRefPtr <nsIAtom> langGroup;
if (aLang != mPangoLanguage) {
// Set up langGroup for Mozilla's font prefs.
langGroup = do_GetAtom(lang);
}
nsAutoTArray<nsString, 20> fcFamilyList;
EnumerateFontList(langGroup ? langGroup.get() : mStyle.language.get(),
&fcFamilyList);
// To consider: A fontset cache here could be helpful.
// Get a pattern suitable for matching.
nsAutoRef<FcPattern> pattern
(gfxFontconfigUtils::NewPattern(fcFamilyList, mStyle, lang));
PrepareSortPattern(pattern, mStyle.size, aSizeAdjustFactor, mStyle.printerFont);
nsRefPtr<gfxFcFontSet> fontset =
new gfxFcFontSet(pattern, mUserFontSet);
mSkipDrawing = fontset->WaitingForUserFont();
if (aMatchPattern)
aMatchPattern->steal(pattern);
return fontset.forget();
}
gfxPangoFontGroup::
FontSetByLangEntry::FontSetByLangEntry(PangoLanguage *aLang,
gfxFcFontSet *aFontSet)
: mLang(aLang), mFontSet(aFontSet)
{
}
gfxFcFontSet *
gfxPangoFontGroup::GetFontSet(PangoLanguage *aLang)
{
GetBaseFontSet(); // sets mSizeAdjustFactor and mFontSets[0]
if (!aLang)
return mFontSets[0].mFontSet;
for (uint32_t i = 0; i < mFontSets.Length(); ++i) {
if (mFontSets[i].mLang == aLang)
return mFontSets[i].mFontSet;
}
nsRefPtr<gfxFcFontSet> fontSet =
MakeFontSet(aLang, mSizeAdjustFactor);
mFontSets.AppendElement(FontSetByLangEntry(aLang, fontSet));
return fontSet;
}
already_AddRefed<gfxFont>
gfxPangoFontGroup::FindFontForChar(uint32_t aCh, uint32_t aPrevCh,
uint32_t aNextCh, int32_t aRunScript,
gfxFont *aPrevMatchedFont,
uint8_t *aMatchType)
{
if (aPrevMatchedFont) {
// Don't switch fonts for control characters, regardless of
// whether they are present in the current font, as they won't
// actually be rendered (see bug 716229)
uint8_t category = GetGeneralCategory(aCh);
if (category == HB_UNICODE_GENERAL_CATEGORY_CONTROL) {
return nsRefPtr<gfxFont>(aPrevMatchedFont).forget();
}
// if this character is a join-control or the previous is a join-causer,
// use the same font as the previous range if we can
if (gfxFontUtils::IsJoinControl(aCh) ||
gfxFontUtils::IsJoinCauser(aPrevCh)) {
if (aPrevMatchedFont->HasCharacter(aCh)) {
return nsRefPtr<gfxFont>(aPrevMatchedFont).forget();
}
}
}
// if this character is a variation selector,
// use the previous font regardless of whether it supports VS or not.
// otherwise the text run will be divided.
if (gfxFontUtils::IsVarSelector(aCh)) {
if (aPrevMatchedFont) {
return nsRefPtr<gfxFont>(aPrevMatchedFont).forget();
}
// VS alone. it's meaningless to search different fonts
return nullptr;
}
// The real fonts that fontconfig provides for generic/fallback families
// depend on the language used, so a different FontSet is used for each
// language (except for the variation below).
//
// With most fontconfig configurations any real family names prior to a
// fontconfig generic with corresponding fonts installed will still lead
// to the same leading fonts in each FontSet.
//
// There is an inefficiency here therefore because the same base FontSet
// could often be used if these real families support the character.
// However, with fontconfig aliases, it is difficult to distinguish
// where exactly alias fonts end and generic/fallback fonts begin.
//
// The variation from pure language-based matching used here is that the
// same primary/base font is always used irrespective of the language.
// This provides that SCRIPT_COMMON characters are consistently rendered
// with the same font (bug 339513 and bug 416725). This is particularly
// important with the word cache as script can't be reliably determined
// from surrounding words. It also often avoids the unnecessary extra
// FontSet efficiency mentioned above.
//
// However, in two situations, the base font is not checked before the
// language-specific FontSet.
//
// 1. When we don't have a language to make a good choice for
// the base font.
//
// 2. For system fonts, use the default Pango behavior to give
// consistency with other apps. This is relevant when un-localized
// builds are run in non-Latin locales. This special-case probably
// wouldn't be necessary but for bug 91190.
gfxFcFontSet *fontSet = GetBaseFontSet();
uint32_t nextFont = 0;
FcPattern *basePattern = nullptr;
if (!mStyle.systemFont && mPangoLanguage) {
basePattern = fontSet->GetFontPatternAt(0);
if (HasChar(basePattern, aCh)) {
*aMatchType = gfxTextRange::kFontGroup;
return nsRefPtr<gfxFont>(GetBaseFont()).forget();
}
nextFont = 1;
}
// Pango, GLib, and Thebes (but not harfbuzz!) all happen to use the same
// script codes, so we can just cast the value here.
const PangoScript script = static_cast<PangoScript>(aRunScript);
// Might be nice to call pango_language_includes_script only once for the
// run rather than for each character.
PangoLanguage *scriptLang;
if ((!basePattern ||
!pango_language_includes_script(mPangoLanguage, script)) &&
(scriptLang = pango_script_get_sample_language(script))) {
fontSet = GetFontSet(scriptLang);
nextFont = 0;
}
for (uint32_t i = nextFont;
FcPattern *pattern = fontSet->GetFontPatternAt(i);
++i) {
if (pattern == basePattern) {
continue; // already checked basePattern
}
if (HasChar(pattern, aCh)) {
*aMatchType = gfxTextRange::kFontGroup;
return nsRefPtr<gfxFont>(fontSet->GetFontAt(i, GetStyle())).forget();
}
}
return nullptr;
}
// Sanity-check: spot-check a few constants to confirm that Thebes and
// Pango script codes really do match
#define CHECK_SCRIPT_CODE(script) \
PR_STATIC_ASSERT(int32_t(MOZ_SCRIPT_##script) == \
int32_t(PANGO_SCRIPT_##script))
CHECK_SCRIPT_CODE(COMMON);
CHECK_SCRIPT_CODE(INHERITED);
CHECK_SCRIPT_CODE(ARABIC);
CHECK_SCRIPT_CODE(LATIN);
CHECK_SCRIPT_CODE(UNKNOWN);
CHECK_SCRIPT_CODE(NKO);
/**
** gfxFcFont
**/
cairo_user_data_key_t gfxFcFont::sGfxFontKey;
gfxFcFont::gfxFcFont(cairo_scaled_font_t *aCairoFont,
gfxFcFontEntry *aFontEntry,
const gfxFontStyle *aFontStyle)
: gfxFT2FontBase(aCairoFont, aFontEntry, aFontStyle)
{
cairo_scaled_font_set_user_data(mScaledFont, &sGfxFontKey, this, nullptr);
}
gfxFcFont::~gfxFcFont()
{
cairo_scaled_font_set_user_data(mScaledFont,
&sGfxFontKey,
nullptr,
nullptr);
}
already_AddRefed<gfxFont>
gfxFcFont::GetSubSuperscriptFont(int32_t aAppUnitsPerDevPixel)
{
gfxFontStyle style(*GetStyle());
style.AdjustForSubSuperscript(aAppUnitsPerDevPixel);
return MakeScaledFont(&style, style.size / GetStyle()->size);
}
already_AddRefed<gfxFont>
gfxFcFont::MakeScaledFont(gfxFontStyle *aFontStyle, gfxFloat aScaleFactor)
{
gfxFcFontEntry* fe = static_cast<gfxFcFontEntry*>(GetFontEntry());
nsRefPtr<gfxFont> font = gfxFontCache::GetCache()->Lookup(fe, aFontStyle);
if (font) {
return font.forget();
}
cairo_matrix_t fontMatrix;
cairo_scaled_font_get_font_matrix(mScaledFont, &fontMatrix);
cairo_matrix_scale(&fontMatrix, aScaleFactor, aScaleFactor);
cairo_matrix_t ctm;
cairo_scaled_font_get_ctm(mScaledFont, &ctm);
cairo_font_options_t *options = cairo_font_options_create();
cairo_scaled_font_get_font_options(mScaledFont, options);
cairo_scaled_font_t *newFont =
cairo_scaled_font_create(cairo_scaled_font_get_font_face(mScaledFont),
&fontMatrix, &ctm, options);
cairo_font_options_destroy(options);
font = new gfxFcFont(newFont, fe, aFontStyle);
gfxFontCache::GetCache()->AddNew(font);
cairo_scaled_font_destroy(newFont);
return font.forget();
}
already_AddRefed<gfxFont>
gfxFcFont::GetSmallCapsFont()
{
gfxFontStyle style(*GetStyle());
style.size *= SMALL_CAPS_SCALE_FACTOR;
style.variantCaps = NS_FONT_VARIANT_CAPS_NORMAL;
return MakeScaledFont(&style, SMALL_CAPS_SCALE_FACTOR);
}
/* static */ void
gfxPangoFontGroup::Shutdown()
{
// Resetting gFTLibrary in case this is wanted again after a
// cairo_debug_reset_static_data.
gFTLibrary = nullptr;
}
/* static */ gfxFontEntry *
gfxPangoFontGroup::NewFontEntry(const nsAString& aFontName,
uint16_t aWeight,
int16_t aStretch,
bool aItalic)
{
gfxFontconfigUtils *utils = gfxFontconfigUtils::GetFontconfigUtils();
if (!utils)
return nullptr;
// The font face name from @font-face { src: local() } is not well
// defined.
//
// On MS Windows, this name gets compared with
// ENUMLOGFONTEXW::elfFullName, which for OpenType fonts seems to be the
// full font name from the name table. For CFF OpenType fonts this is the
// same as the PostScript name, but for TrueType fonts it is usually
// different.
//
// On Mac, the font face name is compared with the PostScript name, even
// for TrueType fonts.
//
// Fontconfig only records the full font names, so the behavior here
// follows that on MS Windows. However, to provide the possibility
// of aliases to compensate for variations, the font face name is passed
// through FcConfigSubstitute.
nsAutoRef<FcPattern> pattern(FcPatternCreate());
if (!pattern)
return nullptr;
NS_ConvertUTF16toUTF8 fullname(aFontName);
FcPatternAddString(pattern, FC_FULLNAME,
gfxFontconfigUtils::ToFcChar8(fullname));
FcConfigSubstitute(nullptr, pattern, FcMatchPattern);
FcChar8 *name;
for (int v = 0;
FcPatternGetString(pattern, FC_FULLNAME, v, &name) == FcResultMatch;
++v) {
const nsTArray< nsCountedRef<FcPattern> >& fonts =
utils->GetFontsForFullname(name);
if (fonts.Length() != 0)
return new gfxLocalFcFontEntry(aFontName,
aWeight,
aStretch,
aItalic,
fonts);
}
return nullptr;
}
/* static */ FT_Library
gfxPangoFontGroup::GetFTLibrary()
{
if (!gFTLibrary) {
// Use cairo's FT_Library so that cairo takes care of shutdown of the
// FT_Library after it has destroyed its font_faces, and FT_Done_Face
// has been called on each FT_Face, at least until this bug is fixed:
// https://bugs.freedesktop.org/show_bug.cgi?id=18857
//
// Cairo's FT_Library can be obtained from any cairo_scaled_font. The
// font properties requested here are chosen to get an FT_Face that is
// likely to be also used elsewhere.
gfxFontStyle style;
nsRefPtr<gfxPangoFontGroup> fontGroup =
new gfxPangoFontGroup(FontFamilyList(eFamily_sans_serif),
&style, nullptr);
gfxFcFont *font = fontGroup->GetBaseFont();
if (!font)
return nullptr;
gfxFT2LockedFace face(font);
if (!face.get())
return nullptr;
gFTLibrary = face.get()->glyph->library;
}
return gFTLibrary;
}
/* static */ gfxFontEntry *
gfxPangoFontGroup::NewFontEntry(const nsAString& aFontName,
uint16_t aWeight,
int16_t aStretch,
bool aItalic,
const uint8_t* aFontData,
uint32_t aLength)
{
// Ownership of aFontData is passed in here, and transferred to the
// new fontEntry, which will release it when no longer needed.
// Using face_index = 0 for the first face in the font, as we have no
// other information. FT_New_Memory_Face checks for a nullptr FT_Library.
FT_Face face;
FT_Error error =
FT_New_Memory_Face(GetFTLibrary(), aFontData, aLength, 0, &face);
if (error != 0) {
NS_Free((void*)aFontData);
return nullptr;
}
return new gfxDownloadedFcFontEntry(aFontName, aWeight,
aStretch, aItalic,
aFontData, face);
}
static double
GetPixelSize(FcPattern *aPattern)
{
double size;
if (FcPatternGetDouble(aPattern,
FC_PIXEL_SIZE, 0, &size) == FcResultMatch)
return size;
NS_NOTREACHED("No size on pattern");
return 0.0;
}
/**
* The following gfxFcFonts are accessed from the cairo_scaled_font or created
* from the FcPattern, not from the gfxFontCache hash table. The gfxFontCache
* hash table is keyed by desired family and style, whereas here we only know
* actual family and style. There may be more than one of these fonts with
* the same family and style, but different PangoFont and actual font face.
*
* The point of this is to record the exact font face for gfxTextRun glyph
* indices. The style of this font does not necessarily represent the exact
* gfxFontStyle used to build the text run. Notably, the language is not
* recorded.
*/
/* static */
already_AddRefed<gfxFcFont>
gfxFcFont::GetOrMakeFont(FcPattern *aRequestedPattern, FcPattern *aFontPattern,
const gfxFontStyle *aFontStyle)
{
nsAutoRef<FcPattern> renderPattern
(FcFontRenderPrepare(nullptr, aRequestedPattern, aFontPattern));
// If synthetic bold/italic is not allowed by the style, adjust the
// resulting pattern to match the actual properties of the font.
if (!aFontStyle->allowSyntheticWeight) {
int weight;
if (FcPatternGetInteger(aFontPattern, FC_WEIGHT, 0,
&weight) == FcResultMatch) {
FcPatternDel(renderPattern, FC_WEIGHT);
FcPatternAddInteger(renderPattern, FC_WEIGHT, weight);
}
}
if (!aFontStyle->allowSyntheticStyle) {
int slant;
if (FcPatternGetInteger(aFontPattern, FC_SLANT, 0,
&slant) == FcResultMatch) {
FcPatternDel(renderPattern, FC_SLANT);
FcPatternAddInteger(renderPattern, FC_SLANT, slant);
}
}
cairo_font_face_t *face =
cairo_ft_font_face_create_for_pattern(renderPattern);
// Reuse an existing font entry if available.
nsRefPtr<gfxFcFontEntry> fe = gfxFcFontEntry::LookupFontEntry(face);
if (!fe) {
gfxDownloadedFcFontEntry *downloadedFontEntry =
GetDownloadedFontEntry(aFontPattern);
if (downloadedFontEntry) {
// Web font
fe = downloadedFontEntry;
if (cairo_font_face_status(face) == CAIRO_STATUS_SUCCESS) {
// cairo_font_face_t is using the web font data.
// Hold a reference to the font entry to keep the font face
// data.
if (!downloadedFontEntry->SetCairoFace(face)) {
// OOM. Let cairo pick a fallback font
cairo_font_face_destroy(face);
face = cairo_ft_font_face_create_for_pattern(aRequestedPattern);
fe = gfxFcFontEntry::LookupFontEntry(face);
}
}
}
if (!fe) {
// Get a unique name for the font face from the file and id.
nsAutoString name;
FcChar8 *fc_file;
if (FcPatternGetString(renderPattern,
FC_FILE, 0, &fc_file) == FcResultMatch) {
int index;
if (FcPatternGetInteger(renderPattern,
FC_INDEX, 0, &index) != FcResultMatch) {
// cairo defaults to 0.
index = 0;
}
AppendUTF8toUTF16(gfxFontconfigUtils::ToCString(fc_file), name);
if (index != 0) {
name.Append('/');
name.AppendInt(index);
}
}
fe = new gfxSystemFcFontEntry(face, aFontPattern, name);
}
}
gfxFontStyle style(*aFontStyle);
style.size = GetPixelSize(renderPattern);
style.style = gfxFontconfigUtils::GetThebesStyle(renderPattern);
style.weight = gfxFontconfigUtils::GetThebesWeight(renderPattern);
nsRefPtr<gfxFont> font = gfxFontCache::GetCache()->Lookup(fe, &style);
if (!font) {
// Note that a file/index pair (or FT_Face) and the gfxFontStyle are
// not necessarily enough to provide a key that will describe a unique
// font. cairoFont contains information from renderPattern, which is a
// fully resolved pattern from FcFontRenderPrepare.
// FcFontRenderPrepare takes the requested pattern and the face
// pattern as input and can modify elements of the resulting pattern
// that affect rendering but are not included in the gfxFontStyle.
cairo_scaled_font_t *cairoFont = CreateScaledFont(renderPattern, face);
font = new gfxFcFont(cairoFont, fe, &style);
gfxFontCache::GetCache()->AddNew(font);
cairo_scaled_font_destroy(cairoFont);
}
cairo_font_face_destroy(face);
nsRefPtr<gfxFcFont> retval(static_cast<gfxFcFont*>(font.get()));
return retval.forget();
}
gfxFcFontSet *
gfxPangoFontGroup::GetBaseFontSet()
{
if (mFontSets.Length() > 0)
return mFontSets[0].mFontSet;
mSizeAdjustFactor = 1.0; // will be adjusted below if necessary
nsAutoRef<FcPattern> pattern;
nsRefPtr<gfxFcFontSet> fontSet =
MakeFontSet(mPangoLanguage, mSizeAdjustFactor, &pattern);
double size = GetPixelSize(pattern);
if (size != 0.0 && mStyle.sizeAdjust != 0.0) {
gfxFcFont *font = fontSet->GetFontAt(0, GetStyle());
if (font) {
const gfxFont::Metrics& metrics =
font->GetMetrics(gfxFont::eHorizontal); // XXX vertical?
// The factor of 0.1 ensures that xHeight is sane so fonts don't
// become huge. Strictly ">" ensures that xHeight and emHeight are
// not both zero.
if (metrics.xHeight > 0.1 * metrics.emHeight) {
mSizeAdjustFactor =
mStyle.sizeAdjust * metrics.emHeight / metrics.xHeight;
size *= mSizeAdjustFactor;
FcPatternDel(pattern, FC_PIXEL_SIZE);
FcPatternAddDouble(pattern, FC_PIXEL_SIZE, size);
fontSet = new gfxFcFontSet(pattern, mUserFontSet);
}
}
}
PangoLanguage *pangoLang = mPangoLanguage;
FcChar8 *fcLang;
if (!pangoLang &&
FcPatternGetString(pattern, FC_LANG, 0, &fcLang) == FcResultMatch) {
pangoLang =
pango_language_from_string(gfxFontconfigUtils::ToCString(fcLang));
}
mFontSets.AppendElement(FontSetByLangEntry(pangoLang, fontSet));
return fontSet;
}
/**
** gfxTextRun
*
* A serious problem:
*
* -- We draw with a font that's hinted for the CTM, but we measure with a font
* hinted to the identity matrix, so our "bounding metrics" may not be accurate.
*
**/
// This will fetch an existing scaled_font if one exists.
static cairo_scaled_font_t *
CreateScaledFont(FcPattern *aPattern, cairo_font_face_t *aFace)
{
double size = GetPixelSize(aPattern);
cairo_matrix_t fontMatrix;
FcMatrix *fcMatrix;
if (FcPatternGetMatrix(aPattern, FC_MATRIX, 0, &fcMatrix) == FcResultMatch)
cairo_matrix_init(&fontMatrix, fcMatrix->xx, -fcMatrix->yx, -fcMatrix->xy, fcMatrix->yy, 0, 0);
else
cairo_matrix_init_identity(&fontMatrix);
cairo_matrix_scale(&fontMatrix, size, size);
FcBool printing;
if (FcPatternGetBool(aPattern, PRINTING_FC_PROPERTY, 0, &printing) != FcResultMatch) {
printing = FcFalse;
}
// The cairo_scaled_font is created with a unit ctm so that metrics and
// positions are in user space, but this means that hinting effects will
// not be estimated accurately for non-unit transformations.
cairo_matrix_t identityMatrix;
cairo_matrix_init_identity(&identityMatrix);
// Font options are set explicitly here to improve cairo's caching
// behavior and to record the relevant parts of the pattern for
// SetupCairoFont (so that the pattern can be released).
//
// Most font_options have already been set as defaults on the FcPattern
// with cairo_ft_font_options_substitute(), then user and system
// fontconfig configurations were applied. The resulting font_options
// have been recorded on the face during
// cairo_ft_font_face_create_for_pattern().
//
// None of the settings here cause this scaled_font to behave any
// differently from how it would behave if it were created from the same
// face with default font_options.
//
// We set options explicitly so that the same scaled_font will be found in
// the cairo_scaled_font_map when cairo loads glyphs from a context with
// the same font_face, font_matrix, ctm, and surface font_options.
//
// Unfortunately, _cairo_scaled_font_keys_equal doesn't know about the
// font_options on the cairo_ft_font_face, and doesn't consider default
// option values to not match any explicit values.
//
// Even after cairo_set_scaled_font is used to set font_options for the
// cairo context, when cairo looks for a scaled_font for the context, it
// will look for a font with some option values from the target surface if
// any values are left default on the context font_options. If this
// scaled_font is created with default font_options, cairo will not find
// it.
cairo_font_options_t *fontOptions = cairo_font_options_create();
// The one option not recorded in the pattern is hint_metrics, which will
// affect glyph metrics. The default behaves as CAIRO_HINT_METRICS_ON.
// We should be considering the font_options of the surface on which this
// font will be used, but currently we don't have different gfxFonts for
// different surface font_options, so we'll create a font suitable for the
// Screen. Image and xlib surfaces default to CAIRO_HINT_METRICS_ON.
if (printing) {
cairo_font_options_set_hint_metrics(fontOptions, CAIRO_HINT_METRICS_OFF);
} else {
cairo_font_options_set_hint_metrics(fontOptions, CAIRO_HINT_METRICS_ON);
}
// The remaining options have been recorded on the pattern and the face.
// _cairo_ft_options_merge has some logic to decide which options from the
// scaled_font or from the cairo_ft_font_face take priority in the way the
// font behaves.
//
// In the majority of cases, _cairo_ft_options_merge uses the options from
// the cairo_ft_font_face, so sometimes it is not so important which
// values are set here so long as they are not defaults, but we'll set
// them to the exact values that we expect from the font, to be consistent
// and to protect against changes in cairo.
//
// In some cases, _cairo_ft_options_merge uses some options from the
// scaled_font's font_options rather than options on the
// cairo_ft_font_face (from fontconfig).
// https://bugs.freedesktop.org/show_bug.cgi?id=11838
//
// Surface font options were set on the pattern in
// cairo_ft_font_options_substitute. If fontconfig has changed the
// hint_style then that is what the user (or distribution) wants, so we
// use the setting from the FcPattern.
//
// Fallback values here mirror treatment of defaults in cairo-ft-font.c.
FcBool hinting = FcFalse;
if (FcPatternGetBool(aPattern, FC_HINTING, 0, &hinting) != FcResultMatch) {
hinting = FcTrue;
}
cairo_hint_style_t hint_style;
if (printing || !hinting) {
hint_style = CAIRO_HINT_STYLE_NONE;
} else {
#ifdef FC_HINT_STYLE // FC_HINT_STYLE is available from fontconfig 2.2.91.
int fc_hintstyle;
if (FcPatternGetInteger(aPattern, FC_HINT_STYLE,
0, &fc_hintstyle ) != FcResultMatch) {
fc_hintstyle = FC_HINT_FULL;
}
switch (fc_hintstyle) {
case FC_HINT_NONE:
hint_style = CAIRO_HINT_STYLE_NONE;
break;
case FC_HINT_SLIGHT:
hint_style = CAIRO_HINT_STYLE_SLIGHT;
break;
case FC_HINT_MEDIUM:
default: // This fallback mirrors _get_pattern_ft_options in cairo.
hint_style = CAIRO_HINT_STYLE_MEDIUM;
break;
case FC_HINT_FULL:
hint_style = CAIRO_HINT_STYLE_FULL;
break;
}
#else // no FC_HINT_STYLE
hint_style = CAIRO_HINT_STYLE_FULL;
#endif
}
cairo_font_options_set_hint_style(fontOptions, hint_style);
int rgba;
if (FcPatternGetInteger(aPattern,
FC_RGBA, 0, &rgba) != FcResultMatch) {
rgba = FC_RGBA_UNKNOWN;
}
cairo_subpixel_order_t subpixel_order = CAIRO_SUBPIXEL_ORDER_DEFAULT;
switch (rgba) {
case FC_RGBA_UNKNOWN:
case FC_RGBA_NONE:
default:
// There is no CAIRO_SUBPIXEL_ORDER_NONE. Subpixel antialiasing
// is disabled through cairo_antialias_t.
rgba = FC_RGBA_NONE;
// subpixel_order won't be used by the font as we won't use
// CAIRO_ANTIALIAS_SUBPIXEL, but don't leave it at default for
// caching reasons described above. Fall through:
case FC_RGBA_RGB:
subpixel_order = CAIRO_SUBPIXEL_ORDER_RGB;
break;
case FC_RGBA_BGR:
subpixel_order = CAIRO_SUBPIXEL_ORDER_BGR;
break;
case FC_RGBA_VRGB:
subpixel_order = CAIRO_SUBPIXEL_ORDER_VRGB;
break;
case FC_RGBA_VBGR:
subpixel_order = CAIRO_SUBPIXEL_ORDER_VBGR;
break;
}
cairo_font_options_set_subpixel_order(fontOptions, subpixel_order);
FcBool fc_antialias;
if (FcPatternGetBool(aPattern,
FC_ANTIALIAS, 0, &fc_antialias) != FcResultMatch) {
fc_antialias = FcTrue;
}
cairo_antialias_t antialias;
if (!fc_antialias) {
antialias = CAIRO_ANTIALIAS_NONE;
} else if (rgba == FC_RGBA_NONE) {
antialias = CAIRO_ANTIALIAS_GRAY;
} else {
antialias = CAIRO_ANTIALIAS_SUBPIXEL;
}
cairo_font_options_set_antialias(fontOptions, antialias);
cairo_scaled_font_t *scaledFont =
cairo_scaled_font_create(aFace, &fontMatrix, &identityMatrix,
fontOptions);
cairo_font_options_destroy(fontOptions);
NS_ASSERTION(cairo_scaled_font_status(scaledFont) == CAIRO_STATUS_SUCCESS,
"Failed to create scaled font");
return scaledFont;
}
/* static */
PangoLanguage *
GuessPangoLanguage(nsIAtom *aLanguage)
{
if (!aLanguage)
return nullptr;
// Pango and fontconfig won't understand mozilla's internal langGroups, so
// find a real language.
nsAutoCString lang;
gfxFontconfigUtils::GetSampleLangForGroup(aLanguage, &lang);
if (lang.IsEmpty())
return nullptr;
return pango_language_from_string(lang.get());
}
#ifdef MOZ_WIDGET_GTK
/***************************************************************************
*
* This function must be last in the file because it uses the system cairo
* library. Above this point the cairo library used is the tree cairo if
* MOZ_TREE_CAIRO.
*/
#if MOZ_TREE_CAIRO
// Tree cairo symbols have different names. Disable their activation through
// preprocessor macros.
#undef cairo_ft_font_options_substitute
// The system cairo functions are not declared because the include paths cause
// the gdk headers to pick up the tree cairo.h.
extern "C" {
NS_VISIBILITY_DEFAULT void
cairo_ft_font_options_substitute (const cairo_font_options_t *options,
FcPattern *pattern);
}
#endif
static void
ApplyGdkScreenFontOptions(FcPattern *aPattern)
{
const cairo_font_options_t *options =
gdk_screen_get_font_options(gdk_screen_get_default());
cairo_ft_font_options_substitute(options, aPattern);
}
#endif // MOZ_WIDGET_GTK2
#ifdef USE_SKIA
mozilla::TemporaryRef<mozilla::gfx::GlyphRenderingOptions>
gfxFcFont::GetGlyphRenderingOptions(const TextRunDrawParams* aRunParams)
{
cairo_scaled_font_t *scaled_font = CairoScaledFont();
cairo_font_options_t *options = cairo_font_options_create();
cairo_scaled_font_get_font_options(scaled_font, options);
cairo_hint_style_t hint_style = cairo_font_options_get_hint_style(options);
cairo_font_options_destroy(options);
mozilla::gfx::FontHinting hinting;
switch (hint_style) {
case CAIRO_HINT_STYLE_NONE:
hinting = mozilla::gfx::FontHinting::NONE;
break;
case CAIRO_HINT_STYLE_SLIGHT:
hinting = mozilla::gfx::FontHinting::LIGHT;
break;
case CAIRO_HINT_STYLE_FULL:
hinting = mozilla::gfx::FontHinting::FULL;
break;
default:
hinting = mozilla::gfx::FontHinting::NORMAL;
break;
}
// We don't want to force the use of the autohinter over the font's built in hints
return mozilla::gfx::Factory::CreateCairoGlyphRenderingOptions(hinting, false);
}
#endif
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