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0fdc24da53
gecko/gfx/thebes/gfxPangoFonts.cpp
Karl Tomlinson 0fdc24da53 b=597147 part 17: switch from pango_itemize to gfxScriptItemizer r=jfkthame 
--HG--
extra : rebase_source : f0b1026020b765d1ffedd1f98d04373b8d8fbc9a
2010-11-11 11:25:59 +13:00

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/* -*- Mode: C++; tab-width: 20; indent-tabs-mode: nil; c-basic-offset: 4 -*-
* ***** BEGIN LICENSE BLOCK *****
* Version: MPL 1.1/GPL 2.0/LGPL 2.1
*
* The contents of this file are subject to the Mozilla Public License Version
* 1.1 (the "License"); you may not use this file except in compliance with
* the License. You may obtain a copy of the License at
* http://www.mozilla.org/MPL/
*
* Software distributed under the License is distributed on an "AS IS" basis,
* WITHOUT WARRANTY OF ANY KIND, either express or implied. See the License
* for the specific language governing rights and limitations under the
* License.
*
* The Original Code is Mozilla Foundation code.
*
* The Initial Developer of the Original Code is Mozilla Foundation.
* Portions created by the Initial Developer are Copyright (C) 2005
* the Initial Developer. All Rights Reserved.
*
* Contributor(s):
* Vladimir Vukicevic <vladimir@mozilla.com>
* Masayuki Nakano <masayuki@d-toybox.com>
* Behdad Esfahbod <behdad@gnome.org>
* Mats Palmgren <mats.palmgren@bredband.net>
* Karl Tomlinson <karlt+@karlt.net>, Mozilla Corporation
*
* based on nsFontMetricsPango.cpp by
* Christopher Blizzard <blizzard@mozilla.org>
*
* Alternatively, the contents of this file may be used under the terms of
* either the GNU General Public License Version 2 or later (the "GPL"), or
* the GNU Lesser General Public License Version 2.1 or later (the "LGPL"),
* in which case the provisions of the GPL or the LGPL are applicable instead
* of those above. If you wish to allow use of your version of this file only
* under the terms of either the GPL or the LGPL, and not to allow others to
* use your version of this file under the terms of the MPL, indicate your
* decision by deleting the provisions above and replace them with the notice
* and other provisions required by the GPL or the LGPL. If you do not delete
* the provisions above, a recipient may use your version of this file under
* the terms of any one of the MPL, the GPL or the LGPL.
*
* ***** END LICENSE BLOCK ***** */
#define PANGO_ENABLE_BACKEND
#define PANGO_ENABLE_ENGINE
#include "prtypes.h"
#include "prlink.h"
#include "gfxTypes.h"
#include "nsTArray.h"
#include "gfxContext.h"
#ifdef MOZ_WIDGET_GTK2
#include "gfxPlatformGtk.h"
#endif
#ifdef MOZ_WIDGET_QT
#include "gfxQtPlatform.h"
#endif
#include "gfxPangoFonts.h"
#include "gfxFT2FontBase.h"
#include "gfxFT2Utils.h"
#include "harfbuzz/hb-unicode.h"
#include "harfbuzz/hb-ot-tag.h"
#include "gfxUnicodeProperties.h"
#include "gfxFontconfigUtils.h"
#include "gfxUserFontSet.h"
#include "gfxAtoms.h"
#include <cairo.h>
#include <cairo-ft.h>
#include <fontconfig/fcfreetype.h>
#include <pango/pango.h>
#include <pango/pango-modules.h>
#include <pango/pangofc-fontmap.h>
#ifdef MOZ_WIDGET_GTK2
#include <gdk/gdk.h>
#endif
#include <math.h>
#define FLOAT_PANGO_SCALE ((gfxFloat)PANGO_SCALE)
#ifndef PANGO_VERSION_CHECK
#define PANGO_VERSION_CHECK(x,y,z) 0
#endif
#ifndef PANGO_GLYPH_UNKNOWN_FLAG
#define PANGO_GLYPH_UNKNOWN_FLAG ((PangoGlyph)0x10000000)
#endif
#ifndef PANGO_GLYPH_EMPTY
#define PANGO_GLYPH_EMPTY ((PangoGlyph)0)
#endif
// For g a PangoGlyph,
#define IS_MISSING_GLYPH(g) ((g) & PANGO_GLYPH_UNKNOWN_FLAG)
#define IS_EMPTY_GLYPH(g) ((g) == PANGO_GLYPH_EMPTY)
class gfxPangoFcFont;
// Same as pango_units_from_double from Pango 1.16 (but not in older versions)
int moz_pango_units_from_double(double d) {
return NS_lround(d * FLOAT_PANGO_SCALE);
}
static PangoLanguage *GuessPangoLanguage(nsIAtom *aLanguage);
static cairo_scaled_font_t *CreateScaledFont(FcPattern *aPattern);
static PRBool CanTakeFastPath(PRUint32 aFlags);
static void SetMissingGlyphs(gfxTextRun *aTextRun, const gchar *aUTF8,
PRUint32 aUTF8Length, PRUint32 *aUTF16Offset);
static PangoFontMap *gPangoFontMap;
static PangoFontMap *GetPangoFontMap();
static PRBool gUseFontMapProperty;
static FT_Library gFTLibrary;
template <class T>
class gfxGObjectRefTraits : public nsPointerRefTraits<T> {
public:
static void Release(T *aPtr) { g_object_unref(aPtr); }
static void AddRef(T *aPtr) { g_object_ref(aPtr); }
};
NS_SPECIALIZE_TEMPLATE
class nsAutoRefTraits<PangoFont> : public gfxGObjectRefTraits<PangoFont> { };
NS_SPECIALIZE_TEMPLATE
class nsAutoRefTraits<PangoCoverage>
: public nsPointerRefTraits<PangoCoverage> {
public:
static void Release(PangoCoverage *aPtr) { pango_coverage_unref(aPtr); }
static void AddRef(PangoCoverage *aPtr) { pango_coverage_ref(aPtr); }
};
// 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 = nsnull;
PRFuncPtr result = PR_FindFunctionSymbolAndLibrary(name, &lib);
if (lib) {
PR_UnloadLibrary(lib);
}
return result;
}
// 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:"
/**
* gfxFcFontEntry:
*
* 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 gfxFcFontEntry 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 gfxFcFontEntry : public gfxFontEntry {
public:
const nsTArray< nsCountedRef<FcPattern> >& GetPatterns()
{
return mPatterns;
}
protected:
gfxFcFontEntry(const gfxProxyFontEntry &aProxyEntry)
// store the family name
: gfxFontEntry(aProxyEntry.mFamily->Name())
{
mItalic = aProxyEntry.mItalic;
mWeight = aProxyEntry.mWeight;
mStretch = aProxyEntry.mStretch;
mIsUserFont = PR_TRUE;
}
// 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);
nsAutoTArray<nsCountedRef<FcPattern>,1> mPatterns;
};
void
gfxFcFontEntry::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);
}
// 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) {
nsCAutoString fullname;
if (gfxFontconfigUtils::GetFullnameFromFamilyAndStyle(aPattern,
&fullname)) {
FcPatternAddString(aPattern, FC_FULLNAME,
gfxFontconfigUtils::ToFcChar8(fullname));
}
}
nsCAutoString 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 gfxFcFontEntry for local fonts from src:local().
*/
class gfxLocalFcFontEntry : public gfxFcFontEntry {
public:
gfxLocalFcFontEntry(const gfxProxyFontEntry &aProxyEntry,
const nsTArray< nsCountedRef<FcPattern> >& aPatterns)
: gfxFcFontEntry(aProxyEntry)
{
if (!mPatterns.SetCapacity(aPatterns.Length()))
return; // OOM
for (PRUint32 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 = PR_TRUE;
}
};
/**
* gfxDownloadedFcFontEntry:
*
* An implementation of gfxFcFontEntry for web fonts from src:url().
*/
class gfxDownloadedFcFontEntry : public gfxFcFontEntry {
public:
// This takes ownership of the face and its underlying data
gfxDownloadedFcFontEntry(const gfxProxyFontEntry &aProxyEntry,
const PRUint8 *aData, FT_Face aFace)
: gfxFcFontEntry(aProxyEntry), mFontData(aData), mFace(aFace)
{
NS_PRECONDITION(aFace != NULL, "aFace is NULL!");
InitPattern();
}
virtual ~gfxDownloadedFcFontEntry();
// Returns a PangoCoverage owned by the FontEntry. The caller must add a
// reference if it wishes to keep the PangoCoverage longer than the
// lifetime of the FontEntry.
PangoCoverage *GetPangoCoverage();
protected:
virtual 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 PRUint8* mFontData;
FT_Face mFace;
// mPangoCoverage is the charset property of the pattern translated to a
// format that Pango understands. A reference is kept here so that it can
// be shared by multiple PangoFonts (of different sizes).
nsAutoRef<PangoCoverage> mPangoCoverage;
};
// 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 nsnull;
if (value.type != FcTypeFTFace) {
NS_NOTREACHED("Wrong type for -moz-font-entry font property");
return nsnull;
}
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 NULL (in fontconfig-2.6.0 at least).
// The dummy file passed here is removed below.
//
// When fontconfig scans the system fonts, FcConfigGetBlanks(NULL) is
// passed as the "blanks" argument, which provides that unexpectedly
// blank glyphs are elided. Here, however, we pass NULL 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, NULL);
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, NULL));
// 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 PangoCoverage *NewPangoCoverage(FcPattern *aFont)
{
// This uses g_slice_alloc which will abort on OOM rather than return NULL.
PangoCoverage *coverage = pango_coverage_new();
FcCharSet *charset;
if (FcPatternGetCharSet(aFont, FC_CHARSET, 0, &charset) != FcResultMatch)
return coverage; // empty
FcChar32 base;
FcChar32 map[FC_CHARSET_MAP_SIZE];
FcChar32 next;
for (base = FcCharSetFirstPage(charset, map, &next);
base != FC_CHARSET_DONE;
base = FcCharSetNextPage(charset, map, &next)) {
for (PRUint32 i = 0; i < FC_CHARSET_MAP_SIZE; ++i) {
PRUint32 offset = 0;
FcChar32 bitmap = map[i];
for (; bitmap; bitmap >>= 1) {
if (bitmap & 1) {
pango_coverage_set(coverage, base + offset,
PANGO_COVERAGE_EXACT);
}
++offset;
}
base += 32;
}
}
return coverage;
}
PangoCoverage *
gfxDownloadedFcFontEntry::GetPangoCoverage()
{
NS_ASSERTION(mPatterns.Length() != 0,
"Can't get coverage without a pattern!");
if (!mPangoCoverage) {
mPangoCoverage.own(NewPangoCoverage(mPatterns[0]));
}
return mPangoCoverage;
}
/*
* 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);
static already_AddRefed<gfxFcFont>
GetOrMakeFont(FcPattern *aRenderPattern, gfxPangoFcFont *aPangoFont);
virtual PRBool InitTextRun(gfxContext *aContext,
gfxTextRun *aTextRun,
const PRUnichar *aString,
PRUint32 aRunStart,
PRUint32 aRunLength,
PRInt32 aRunScript);
#if defined(ENABLE_FAST_PATH_8BIT)
nsresult InitGlyphRunFast(gfxTextRun *aTextRun, const PRUnichar *aString,
PRUint32 aStart, PRUint32 aLength);
#endif
PRBool InitGlyphRunWithPango(gfxTextRun *aTextRun,
const PRUnichar *aString,
PRUint32 aRunStart, PRUint32 aRunLength,
PangoScript aScript);
// The PangoFont returned is owned by the gfxFcFont
PangoFont *GetPangoFont() {
if (!mPangoFont) {
MakePangoFont();
}
return mPangoFont;
}
private:
static already_AddRefed<gfxFcFont> GetOrMakeFont(FcPattern *aPattern);
gfxFcFont(cairo_scaled_font_t *aCairoFont,
gfxFontEntry *aFontEntry, const gfxFontStyle *aFontStyle);
void MakePangoFont();
// For memory efficiency, this is a font pattern, not a fully resolved
// pattern. Only needed for constructing mPangoFont.
nsCountedRef<FcPattern> mFontPattern;
PangoFont *mPangoFont;
// key for locating a gfxFcFont corresponding to a cairo_scaled_font
static cairo_user_data_key_t sGfxFontKey;
};
/**
* gfxPangoFcFont:
*
* An implementation of PangoFcFont that wraps a gfxFont so that it can be
* passed to PangoRenderFc shapers.
*
* Many of these will be created for pango_itemize, but most will only be
* tested for coverage of individual characters (and sometimes not even that).
* Therefore the gfxFont is only constructed if and when needed.
*/
#define GFX_TYPE_PANGO_FC_FONT (gfx_pango_fc_font_get_type())
#define GFX_PANGO_FC_FONT(object) (G_TYPE_CHECK_INSTANCE_CAST ((object), GFX_TYPE_PANGO_FC_FONT, gfxPangoFcFont))
#define GFX_IS_PANGO_FC_FONT(object) (G_TYPE_CHECK_INSTANCE_TYPE ((object), GFX_TYPE_PANGO_FC_FONT))
/* static */
GType gfx_pango_fc_font_get_type (void);
#define GFX_PANGO_FC_FONT_CLASS(klass) (G_TYPE_CHECK_CLASS_CAST ((klass), GFX_TYPE_PANGO_FC_FONT, gfxPangoFcFontClass))
#define GFX_IS_PANGO_FC_FONT_CLASS(klass) (G_TYPE_CHECK_CLASS_TYPE ((klass), GFX_TYPE_PANGO_FC_FONT))
#define GFX_PANGO_FC_FONT_GET_CLASS(obj) (G_TYPE_INSTANCE_GET_CLASS ((obj), GFX_TYPE_PANGO_FC_FONT, gfxPangoFcFontClass))
// This struct is POD so that it can be used as a GObject.
struct gfxPangoFcFont {
PangoFcFont parent_instance;
PangoCoverage *mCoverage;
gfxFcFont *mGfxFont;
// The gfxPangoFcFont adds a reference to |aGfxFont| and |aFontPattern|.
// Providing one of fontconfig's font patterns uses much less memory than
// using a fully resolved pattern, because fontconfig's font patterns are
// shared and will exist anyway.
//
// Note that the ownership between this PangoFont and the gfxFcFont is
// shared and the gfxFcFont will sometimes remove its reference added
// here. See PangoFontToggleNotify.
static nsReturnRef<PangoFont>
NewFont(gfxFcFont *aGfxFont, FcPattern *aFontPattern);
// Tell |this| that it no longer needs the gfxFcFont and the caller
// assumes ownership of the gfxFcFont reference added at construction of
// |this|. The method is called just before the gfxFcFont removes the
// last reference to |this|.
void ForgetGfxFont() { mGfxFont = nsnull; }
gfxFcFont *GfxFont()
{
if (!mGfxFont) {
SetGfxFont();
}
return mGfxFont;
}
cairo_scaled_font_t *CairoFont()
{
return GfxFont()->CairoScaledFont();
}
private:
void SetFontMap();
void SetGfxFont();
};
struct gfxPangoFcFontClass {
PangoFcFontClass parent_class;
};
G_DEFINE_TYPE (gfxPangoFcFont, gfx_pango_fc_font, PANGO_TYPE_FC_FONT)
/* static */ nsReturnRef<PangoFont>
gfxPangoFcFont::NewFont(gfxFcFont *aGfxFont, FcPattern *aFontPattern)
{
// The font pattern is needed for pango_fc_font_finalize.
gfxPangoFcFont *font = static_cast<gfxPangoFcFont*>
(g_object_new(GFX_TYPE_PANGO_FC_FONT, "pattern", aFontPattern, NULL));
NS_ADDREF(aGfxFont);
font->mGfxFont = aGfxFont;
font->SetFontMap();
PangoFcFont *fc_font = &font->parent_instance;
cairo_scaled_font_t *scaled_font = aGfxFont->CairoScaledFont();
// Normally the is_hinted field of PangoFcFont is set based on the
// FC_HINTING property on the pattern at construction, but this property
// is not on an unresolved aFontPattern. is_hinted is used by
// pango_fc_font_kern_glyphs, which is sometimes used by
// pango_ot_buffer_output.
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);
fc_font->is_hinted = hint_style != CAIRO_HINT_STYLE_NONE;
// is_transformed does not appear to be used anywhere but looks
// like it should be set.
cairo_matrix_t matrix;
cairo_scaled_font_get_font_matrix(scaled_font, &matrix);
fc_font->is_transformed = (matrix.xy != 0.0 || matrix.yx != 0.0 ||
matrix.xx != matrix.yy);
return nsReturnRef<PangoFont>(PANGO_FONT(font));
}
void
gfxPangoFcFont::SetFontMap()
{
// PangoFcFont::get_coverage wants a PangoFcFontMap. (PangoFcFontMap
// would usually set this after calling PangoFcFontMap::create_font()
// or new_font().)
PangoFontMap *fontmap = GetPangoFontMap();
// In Pango-1.24.4, we can use the "fontmap" property; by setting the
// property, the PangoFcFont base class manages the pointer (as a weak
// reference).
PangoFcFont *fc_font = &parent_instance;
if (gUseFontMapProperty) {
g_object_set(this, "fontmap", fontmap, NULL);
} else {
// In Pango versions up to 1.20.5, the parent class will decrement
// the reference count of the fontmap during shutdown() or
// finalize() of the font. In Pango versions from 1.22.0 this no
// longer happens, so we'll end up leaking the (singleton)
// fontmap.
fc_font->fontmap = fontmap;
g_object_ref(fc_font->fontmap);
}
}
void
gfxPangoFcFont::SetGfxFont() {
PangoFcFont *fc_font = &parent_instance;
// Created with gfxPangoFontMap::new_font()
mGfxFont = gfxFcFont::GetOrMakeFont(fc_font->font_pattern, this).get();
}
static void
gfx_pango_fc_font_init(gfxPangoFcFont *font)
{
}
static void
gfx_pango_fc_font_finalize(GObject *object)
{
gfxPangoFcFont *self = GFX_PANGO_FC_FONT(object);
if (self->mCoverage)
pango_coverage_unref(self->mCoverage);
NS_IF_RELEASE(self->mGfxFont);
G_OBJECT_CLASS(gfx_pango_fc_font_parent_class)->finalize(object);
}
static PangoCoverage *
gfx_pango_fc_font_get_coverage(PangoFont *font, PangoLanguage *lang)
{
gfxPangoFcFont *self = GFX_PANGO_FC_FONT(font);
// The coverage is requested often enough that it is worth holding a
// reference on the font.
if (!self->mCoverage) {
FcPattern *pattern = self->parent_instance.font_pattern;
gfxDownloadedFcFontEntry *downloadedFontEntry =
GetDownloadedFontEntry(pattern);
// The parent class implementation requires the font pattern to have
// a file and caches results against that filename. This is not
// suitable for web fonts.
if (!downloadedFontEntry) {
self->mCoverage =
PANGO_FONT_CLASS(gfx_pango_fc_font_parent_class)->
get_coverage(font, lang);
} else {
self->mCoverage =
pango_coverage_ref(downloadedFontEntry->GetPangoCoverage());
}
}
return pango_coverage_ref(self->mCoverage);
}
static PRInt32
GetDPI()
{
#if defined(MOZ_WIDGET_GTK2)
return gfxPlatformGtk::GetDPI();
#elif defined(MOZ_WIDGET_QT)
return gfxQtPlatform::GetDPI();
#else
return 96;
#endif
}
static PangoFontDescription *
gfx_pango_fc_font_describe(PangoFont *font)
{
gfxPangoFcFont *self = GFX_PANGO_FC_FONT(font);
PangoFcFont *fcFont = &self->parent_instance;
PangoFontDescription *result =
pango_font_description_copy(fcFont->description);
gfxFcFont *gfxFont = self->GfxFont();
if (gfxFont) {
double pixelsize = gfxFont->GetStyle()->size;
double dpi = GetDPI();
gint size = moz_pango_units_from_double(pixelsize * dpi / 72.0);
pango_font_description_set_size(result, size);
}
return result;
}
static PangoFontDescription *
gfx_pango_fc_font_describe_absolute(PangoFont *font)
{
gfxPangoFcFont *self = GFX_PANGO_FC_FONT(font);
PangoFcFont *fcFont = &self->parent_instance;
PangoFontDescription *result =
pango_font_description_copy(fcFont->description);
gfxFcFont *gfxFont = self->GfxFont();
if (gfxFont) {
double size = gfxFont->GetStyle()->size * PANGO_SCALE;
pango_font_description_set_absolute_size(result, size);
}
return result;
}
static void
gfx_pango_fc_font_get_glyph_extents(PangoFont *font, PangoGlyph glyph,
PangoRectangle *ink_rect,
PangoRectangle *logical_rect)
{
gfxPangoFcFont *self = GFX_PANGO_FC_FONT(font);
gfxFcFont *gfxFont = self->GfxFont();
if (IS_MISSING_GLYPH(glyph)) {
const gfxFont::Metrics& metrics = gfxFont->GetMetrics();
PangoRectangle rect;
rect.x = 0;
rect.y = moz_pango_units_from_double(-metrics.maxAscent);
rect.width = moz_pango_units_from_double(metrics.aveCharWidth);
rect.height = moz_pango_units_from_double(metrics.maxHeight);
if (ink_rect) {
*ink_rect = rect;
}
if (logical_rect) {
*logical_rect = rect;
}
return;
}
if (logical_rect) {
// logical_rect.width is possibly used by pango_ot_buffer_output (used
// by many shapers) and used by fallback_engine_shape (possibly used
// by pango_shape and pango_itemize when no glyphs are found). I
// doubt the other fields will be used but we won't have any way to
// detecting if they are so we'd better set them.
const gfxFont::Metrics& metrics = gfxFont->GetMetrics();
logical_rect->y = moz_pango_units_from_double(-metrics.maxAscent);
logical_rect->height = moz_pango_units_from_double(metrics.maxHeight);
}
cairo_text_extents_t extents;
if (IS_EMPTY_GLYPH(glyph)) {
new (&extents) cairo_text_extents_t(); // zero
} else {
gfxFont->GetGlyphExtents(glyph, &extents);
}
if (ink_rect) {
ink_rect->x = moz_pango_units_from_double(extents.x_bearing);
ink_rect->y = moz_pango_units_from_double(extents.y_bearing);
ink_rect->width = moz_pango_units_from_double(extents.width);
ink_rect->height = moz_pango_units_from_double(extents.height);
}
if (logical_rect) {
logical_rect->x = 0;
logical_rect->width = moz_pango_units_from_double(extents.x_advance);
}
}
static PangoFontMetrics *
gfx_pango_fc_font_get_metrics(PangoFont *font, PangoLanguage *language)
{
gfxPangoFcFont *self = GFX_PANGO_FC_FONT(font);
// This uses g_slice_alloc which will abort on OOM rather than return NULL.
PangoFontMetrics *result = pango_font_metrics_new();
gfxFcFont *gfxFont = self->GfxFont();
if (gfxFont) {
const gfxFont::Metrics& metrics = gfxFont->GetMetrics();
result->ascent = moz_pango_units_from_double(metrics.maxAscent);
result->descent = moz_pango_units_from_double(metrics.maxDescent);
result->approximate_char_width =
moz_pango_units_from_double(metrics.aveCharWidth);
result->approximate_digit_width =
moz_pango_units_from_double(metrics.zeroOrAveCharWidth);
result->underline_position =
moz_pango_units_from_double(metrics.underlineOffset);
result->underline_thickness =
moz_pango_units_from_double(metrics.underlineSize);
result->strikethrough_position =
moz_pango_units_from_double(metrics.strikeoutOffset);
result->strikethrough_thickness =
moz_pango_units_from_double(metrics.strikeoutSize);
}
return result;
}
static FT_Face
gfx_pango_fc_font_lock_face(PangoFcFont *font)
{
gfxPangoFcFont *self = GFX_PANGO_FC_FONT(font);
return cairo_ft_scaled_font_lock_face(self->CairoFont());
}
static void
gfx_pango_fc_font_unlock_face(PangoFcFont *font)
{
gfxPangoFcFont *self = GFX_PANGO_FC_FONT(font);
cairo_ft_scaled_font_unlock_face(self->CairoFont());
}
static guint
gfx_pango_fc_font_get_glyph(PangoFcFont *font, gunichar wc)
{
gfxPangoFcFont *self = GFX_PANGO_FC_FONT(font);
gfxFcFont *gfxFont = self->GfxFont();
return gfxFont->GetGlyph(wc);
}
typedef int (*PangoVersionFunction)();
static void
gfx_pango_fc_font_class_init (gfxPangoFcFontClass *klass)
{
GObjectClass *object_class = G_OBJECT_CLASS (klass);
PangoFontClass *font_class = PANGO_FONT_CLASS (klass);
PangoFcFontClass *fc_font_class = PANGO_FC_FONT_CLASS (klass);
object_class->finalize = gfx_pango_fc_font_finalize;
font_class->get_coverage = gfx_pango_fc_font_get_coverage;
// describe is called on errors in pango_shape.
font_class->describe = gfx_pango_fc_font_describe;
font_class->get_glyph_extents = gfx_pango_fc_font_get_glyph_extents;
// get_metrics and describe_absolute are not likely to be used but
// implemented because the class makes them available.
font_class->get_metrics = gfx_pango_fc_font_get_metrics;
font_class->describe_absolute = gfx_pango_fc_font_describe_absolute;
// font_class->find_shaper,get_font_map are inherited from PangoFcFontClass
// fc_font_class->has_char is inherited
fc_font_class->lock_face = gfx_pango_fc_font_lock_face;
fc_font_class->unlock_face = gfx_pango_fc_font_unlock_face;
fc_font_class->get_glyph = gfx_pango_fc_font_get_glyph;
// The "fontmap" property on PangoFcFont was introduced for Pango-1.24.0
// but versions prior to Pango-1.24.4 leaked weak pointers for every font,
// which would causes crashes when shutting down the FontMap. For the
// early Pango-1.24.x versions we're better off setting the fontmap member
// ourselves, which will not create weak pointers to leak, and instead
// we'll leak the FontMap on shutdown. pango_version() and
// PANGO_VERSION_ENCODE require Pango-1.16.
PangoVersionFunction pango_version =
reinterpret_cast<PangoVersionFunction>
(FindFunctionSymbol("pango_version"));
gUseFontMapProperty = pango_version && (*pango_version)() >= 12404;
}
/**
* gfxFcFontSet:
*
* Translation from a desired FcPattern to a sorted set of font references
* (fontconfig cache data) and (when needed) fonts.
*/
class gfxFcFontSet {
public:
NS_INLINE_DECL_REFCOUNTING(gfxFcFontSet)
explicit gfxFcFontSet(FcPattern *aPattern,
gfxUserFontSet *aUserFontSet)
: mSortPattern(aPattern), mUserFontSet(aUserFontSet),
mFcFontSet(SortPreferredFonts()), mFcFontsTrimmed(0),
mHaveFallbackFonts(PR_FALSE)
{
}
// A reference is held by the FontSet.
// The caller may add a ref to keep the font alive longer than the FontSet.
gfxFcFont *GetFontAt(PRUint32 i)
{
if (i >= mFonts.Length() || !mFonts[i].mFont) {
// GetFontPatternAt sets up mFonts
FcPattern *fontPattern = GetFontPatternAt(i);
if (!fontPattern)
return NULL;
mFonts[i].mFont =
gfxFcFont::GetOrMakeFont(mSortPattern, fontPattern);
}
return mFonts[i].mFont;
}
FcPattern *GetFontPatternAt(PRUint32 i);
private:
nsReturnRef<FcFontSet> SortPreferredFonts();
nsReturnRef<FcFontSet> SortFallbackFonts();
struct FontEntry {
explicit FontEntry(FcPattern *aPattern) : mPattern(aPattern) {}
nsCountedRef<FcPattern> mPattern;
nsRefPtr<gfxFcFont> mFont;
nsCountedRef<PangoFont> mPangoFont;
};
struct LangSupportEntry {
LangSupportEntry(FcChar8 *aLang, FcLangResult aSupport) :
mLang(aLang), mBestSupport(aSupport) {}
FcChar8 *mLang;
FcLangResult mBestSupport;
};
public:
// public for nsTArray
class LangComparator {
public:
PRBool 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 NULL).
PRPackedBool mHaveFallbackFonts;
};
// 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, PRUint8 aStyle, PRUint16 aWeight)
{
// 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.
PRBool needsBold;
gfxFontStyle style;
style.style = aStyle;
style.weight = aWeight;
gfxFcFontEntry *fontEntry = static_cast<gfxFcFontEntry*>
(mUserFontSet->FindFontEntry(utf16Family, style, needsBold));
// Accept synthetic oblique for italic and oblique.
if (!fontEntry && aStyle != FONT_STYLE_NORMAL) {
style.style = FONT_STYLE_NORMAL;
fontEntry = static_cast<gfxFcFontEntry*>
(mUserFontSet->FindFontEntry(utf16Family, style, needsBold));
}
if (!fontEntry)
return NULL;
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 always prefers a matching family to a matching slant, but CSS
// mostly prioritizes slant. The logic here is from CSS 2.1.
static PRBool
SlantIsAcceptable(FcPattern *aFont, int aRequestedSlant)
{
// CSS accepts (possibly synthetic) oblique for italic.
if (aRequestedSlant == FC_SLANT_ITALIC)
return PR_TRUE;
int slant;
FcResult result = FcPatternGetInteger(aFont, FC_SLANT, 0, &slant);
// Not having a value would be strange.
// fontconfig sort and match functions would consider no value a match.
if (result != FcResultMatch)
return PR_TRUE;
switch (aRequestedSlant) {
case FC_SLANT_ROMAN:
// CSS requires an exact match
return slant == aRequestedSlant;
case FC_SLANT_OBLIQUE:
// Accept synthetic oblique from Roman,
// but CSS doesn't accept italic.
return slant != FC_SLANT_ITALIC;
}
return PR_TRUE;
}
// fontconfig prefers a matching family or lang to pixelsize of bitmap
// fonts. CSS suggests a tolerance of 20% on pixelsize.
static PRBool
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 PR_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()
{
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;
existingFamilies.Init(50);
FcChar8 *family;
for (int v = 0;
FcPatternGetString(mSortPattern,
FC_FAMILY, v, &family) == FcResultMatch; ++v) {
const nsTArray< nsCountedRef<FcPattern> > *familyFonts = nsnull;
// Is this an @font-face family?
PRBool isUserFont = PR_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 = PR_TRUE;
// Trim off the prefix
nsDependentCSubstring cssFamily(cFamily, userPrefix.Length());
PRUint8 thebesStyle =
gfxFontconfigUtils::FcSlantToThebesStyle(requestedSlant);
PRUint16 thebesWeight =
gfxFontconfigUtils::GetThebesWeight(mSortPattern);
familyFonts = FindFontPatterns(mUserFontSet, cssFamily,
thebesStyle, thebesWeight);
}
}
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 (PRUint32 f = 0; f < familyFonts->Length(); ++f) {
FcPattern *font = familyFonts->ElementAt(f);
// User fonts are already filtered by slant (but not size) in
// mUserFontSet->FindFontEntry().
if (!isUserFont && !SlantIsAcceptable(font, requestedSlant))
continue;
if (requestedSize != -1.0 && !SizeIsAcceptable(font, requestedSize))
continue;
for (PRUint32 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)) {
FcPatternReference(font);
}
}
}
FcPattern *truncateMarker = NULL;
for (PRUint32 r = 0; r < requiredLangs.Length(); ++r) {
const nsTArray< nsCountedRef<FcPattern> >& langFonts =
utils->GetFontsForLang(requiredLangs[r].mLang);
PRBool haveLangFont = PR_FALSE;
for (PRUint32 f = 0; f < langFonts.Length(); ++f) {
FcPattern *font = langFonts[f];
if (!SlantIsAcceptable(font, requestedSlant))
continue;
if (requestedSize != -1.0 && !SizeIsAcceptable(font, requestedSize))
continue;
haveLangFont = PR_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 NULL
// Solaris's FcFontSetSort needs an FcConfig (bug 474758)
fontSet.own(FcFontSetSort(FcConfigGetCurrent(), sets, 1, mSortPattern,
FcFalse, NULL, &result));
#else
fontSet.own(FcFontSetSort(NULL, sets, 1, mSortPattern,
FcFalse, NULL, &result));
#endif
if (truncateMarker != NULL && 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(NULL, mSortPattern,
FcFalse, NULL, &result));
}
// GetFontAt relies on this setting up all patterns up to |i|.
FcPattern *
gfxFcFontSet::GetFontPatternAt(PRUint32 i)
{
while (i >= mFonts.Length()) {
while (!mFcFontSet) {
if (mHaveFallbackFonts)
return nsnull;
mFcFontSet = SortFallbackFonts();
mHaveFallbackFonts = PR_TRUE;
mFcFontsTrimmed = 0;
// Loop to test that mFcFontSet is non-NULL.
}
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 = NULL;
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;
}
static PRBool HasChar(FcPattern *aFont, FcChar32 wc)
{
FcCharSet *charset = NULL;
FcPatternGetCharSet(aFont, FC_CHARSET, 0, &charset);
return charset && FcCharSetHasChar(charset, wc);
}
/**
* gfxPangoFontMap: An implementation of a PangoFontMap.
*
* This is a PangoFcFontMap for gfxPangoFcFont.
*/
#define GFX_TYPE_PANGO_FONT_MAP (gfx_pango_font_map_get_type())
#define GFX_PANGO_FONT_MAP(object) (G_TYPE_CHECK_INSTANCE_CAST ((object), GFX_TYPE_PANGO_FONT_MAP, gfxPangoFontMap))
#define GFX_IS_PANGO_FONT_MAP(object) (G_TYPE_CHECK_INSTANCE_TYPE ((object), GFX_TYPE_PANGO_FONT_MAP))
GType gfx_pango_font_map_get_type (void);
#define GFX_PANGO_FONT_MAP_CLASS(klass) (G_TYPE_CHECK_CLASS_CAST ((klass), GFX_TYPE_PANGO_FONT_MAP, gfxPangoFontMapClass))
#define GFX_IS_PANGO_FONT_MAP_CLASS(klass) (G_TYPE_CHECK_CLASS_TYPE ((klass), GFX_TYPE_PANGO_FONT_MAP))
#define GFX_PANGO_FONT_MAP_GET_CLASS(obj) (G_TYPE_INSTANCE_GET_CLASS ((obj), GFX_TYPE_PANGO_FONT_MAP, gfxPangoFontMapClass))
// Do not instantiate this class directly, but use NewFontMap.
// This struct is POD so that it can be used as a GObject.
struct gfxPangoFontMap {
PangoFcFontMap parent_instance;
static PangoFontMap *
NewFontMap()
{
gfxPangoFontMap *fontmap = static_cast<gfxPangoFontMap *>
(g_object_new(GFX_TYPE_PANGO_FONT_MAP, NULL));
return PANGO_FONT_MAP(fontmap);
}
};
struct gfxPangoFontMapClass {
PangoFcFontMapClass parent_class;
};
G_DEFINE_TYPE (gfxPangoFontMap, gfx_pango_font_map, PANGO_TYPE_FC_FONT_MAP)
static void
gfx_pango_font_map_init(gfxPangoFontMap *fontset)
{
}
static double
gfx_pango_font_map_get_resolution(PangoFcFontMap *fcfontmap,
PangoContext *context)
{
// This merely enables the FC_SIZE field of the pattern to be accurate.
return GetDPI();
}
#ifdef MOZ_WIDGET_GTK2
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, PRBool aIsPrinterFont)
{
FcConfigSubstitute(NULL, 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);
} else {
#ifdef MOZ_GFX_OPTIMIZE_MOBILE
cairo_font_options_t *options = cairo_font_options_create();
cairo_font_options_set_hint_style(options, CAIRO_HINT_STYLE_NONE);
cairo_ft_font_options_substitute(options, aPattern);
cairo_font_options_destroy(options);
#endif
#ifdef MOZ_WIDGET_GTK2
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);
}
static void
gfx_pango_font_map_default_substitute(PangoFcFontMap *fontmap,
FcPattern *pattern)
{
// The context is not available here but most of our rendering is for the
// screen so aIsPrinterFont is set to FALSE.
PrepareSortPattern(pattern, 18.0, 1.0, FALSE);
}
static PangoFcFont *
gfx_pango_font_map_new_font(PangoFcFontMap *fontmap,
FcPattern *pattern)
{
return PANGO_FC_FONT(g_object_new(GFX_TYPE_PANGO_FC_FONT,
"pattern", pattern, NULL));
}
static void
gfx_pango_font_map_class_init(gfxPangoFontMapClass *klass)
{
// inherit GObjectClass::finalize from parent as this class adds no data.
// inherit PangoFontMap::load_font (which is not likely to be used)
// from PangoFcFontMap
// inherit PangoFontMap::list_families (which is not likely to be used)
// from PangoFcFontMap
// inherit PangoFontMap::load_fontset (which is not likely to be used)
// from PangoFcFontMap
// inherit PangoFontMap::shape_engine_type from PangoFcFontMap
PangoFcFontMapClass *fcfontmap_class = PANGO_FC_FONT_MAP_CLASS (klass);
fcfontmap_class->get_resolution = gfx_pango_font_map_get_resolution;
// context_key_* virtual functions are only necessary if we want to
// dynamically respond to changes in the screen cairo_font_options_t.
// The APIs for context_substitute/fontset_key_substitute and create_font
// changed between Pango 1.22 and 1.24 so default_substitute and
// new_font are provided instead.
// default_substitute and new_font are not likely to be used but
// implemented because the class makes them available and an
// implementation should provide either create_font or new_font.
fcfontmap_class->default_substitute = gfx_pango_font_map_default_substitute;
fcfontmap_class->new_font = gfx_pango_font_map_new_font;
}
/**
** gfxPangoFontGroup
**/
struct FamilyCallbackData {
FamilyCallbackData(nsTArray<nsString> *aFcFamilyList,
gfxUserFontSet *aUserFontSet)
: mFcFamilyList(aFcFamilyList), mUserFontSet(aUserFontSet)
{
}
nsTArray<nsString> *mFcFamilyList;
const gfxUserFontSet *mUserFontSet;
};
static int
FFRECountHyphens (const nsAString &aFFREName)
{
int h = 0;
PRInt32 hyphen = 0;
while ((hyphen = aFFREName.FindChar('-', hyphen)) >= 0) {
++h;
++hyphen;
}
return h;
}
static PRBool
FamilyCallback (const nsAString& fontName, const nsACString& genericName,
void *closure)
{
FamilyCallbackData *data = static_cast<FamilyCallbackData*>(closure);
nsTArray<nsString> *list = data->mFcFamilyList;
// We ignore prefs that have three hypens since they are X style prefs.
if (genericName.Length() && FFRECountHyphens(fontName) >= 3)
return PR_TRUE;
if (!list->Contains(fontName)) {
// The family properties of FcPatterns for @font-face fonts have a
// namespace to identify them among system fonts. (see
// FONT_FACE_FAMILY_PREFIX.) The CSS family name can match either the
// @font-face family or the system font family so both names are added
// here.
//
// http://www.w3.org/TR/2002/WD-css3-webfonts-20020802 required
// looking for locally-installed fonts matching requested properties
// before checking the src descriptor in @font-face rules.
// http://www.w3.org/TR/2008/REC-CSS2-20080411/fonts.html#algorithm
// also only checks src descriptors if there is no local font matching
// the requested properties.
//
// Similarly "Editor's Draft 27 June 2008"
// http://dev.w3.org/csswg/css3-fonts/#font-matching says "The user
// agent attempts to find the family name among fonts available on the
// system and then among fonts defined via @font-face rules."
// However, this is contradicted by "if [the name from the font-family
// descriptor] is the same as a font family available in a given
// user's environment, it effectively hides the underlying font for
// documents that use the stylesheet."
//
// Windows and Mac code currently prioritizes fonts from @font-face
// rules. The order of families here reflects the priorities on those
// platforms.
const gfxUserFontSet *userFontSet = data->mUserFontSet;
if (genericName.Length() == 0 &&
userFontSet && userFontSet->HasFamily(fontName)) {
nsAutoString userFontName =
NS_LITERAL_STRING(FONT_FACE_FAMILY_PREFIX) + fontName;
list->AppendElement(userFontName);
}
list->AppendElement(fontName);
}
return PR_TRUE;
}
gfxPangoFontGroup::gfxPangoFontGroup (const nsAString& families,
const gfxFontStyle *aStyle,
gfxUserFontSet *aUserFontSet)
: gfxFontGroup(families, 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));
}
mFonts.AppendElements(1);
}
gfxPangoFontGroup::~gfxPangoFontGroup()
{
}
gfxFontGroup *
gfxPangoFontGroup::Copy(const gfxFontStyle *aStyle)
{
return new gfxPangoFontGroup(mFamilies, aStyle, mUserFontSet);
}
// An array of family names suitable for fontconfig
void
gfxPangoFontGroup::GetFcFamilies(nsTArray<nsString> *aFcFamilyList,
nsIAtom *aLanguage)
{
FamilyCallbackData data(aFcFamilyList, mUserFontSet);
// Leave non-existing fonts in the list so that fontconfig can get the
// best match.
ForEachFontInternal(mFamilies, aLanguage, PR_TRUE, PR_FALSE,
FamilyCallback, &data);
}
gfxFcFont *
gfxPangoFontGroup::GetBaseFont()
{
if (!mFonts[0]) {
mFonts[0] = GetBaseFontSet()->GetFontAt(0);
}
return static_cast<gfxFcFont*>(mFonts[0].get());
}
gfxFont *
gfxPangoFontGroup::GetFontAt(PRInt32 i) {
// If it turns out to be hard for all clients that cache font
// groups to call UpdateFontList at appropriate times, we could
// instead consider just calling UpdateFontList from someplace
// more central (such as here).
NS_ASSERTION(!mUserFontSet || mCurrGeneration == GetGeneration(),
"Whoever was caching this font group should have "
"called UpdateFontList on it");
NS_PRECONDITION(i == 0, "Only have one font");
return GetBaseFont();
}
void
gfxPangoFontGroup::UpdateFontList()
{
if (!mUserFontSet)
return;
PRUint64 newGeneration = mUserFontSet->GetGeneration();
if (newGeneration == mCurrGeneration)
return;
mFonts[0] = NULL;
mFontSets.Clear();
mUnderlineOffset = UNDERLINE_OFFSET_NOT_SET;
mCurrGeneration = newGeneration;
}
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;
GetFcFamilies(&fcFamilyList,
langGroup ? langGroup.get() : mStyle.language.get());
// 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);
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 (PRUint32 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(PRUint32 aCh, PRUint32 aPrevCh,
PRInt32 aRunScript,
gfxFont *aPrevMatchedFont)
{
if (aPrevMatchedFont) {
PRUint8 category = gfxUnicodeProperties::GetGeneralCategory(aCh);
// If this character is a format character (including join-causers)
// or a variation selector, use the same font as the previous
// character, regardless of whether it supports the character.
// Otherwise the text run will be divided.
if ((category == HB_CATEGORY_CONTROL ||
category == HB_CATEGORY_FORMAT ||
gfxFontUtils::IsVarSelector(aCh))) {
return nsRefPtr<gfxFont>(aPrevMatchedFont).forget();
}
// If the previous character is a space or a join-causer and the
// previous font supports this character, then use the same font.
//
// The fonts selected for spaces are usually ignored. Sticking with
// the same font avoids breaking the shaping run.
if (aCh == ' ' ||
(gfxFontUtils::IsJoinCauser(aPrevCh) &&
static_cast<gfxFcFont*>(aPrevMatchedFont)->GetGlyph(aCh))) {
return nsRefPtr<gfxFont>(aPrevMatchedFont).forget();
}
}
// 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();
PRUint32 nextFont = 0;
FcPattern *basePattern = NULL;
if (!mStyle.systemFont && mPangoLanguage) {
basePattern = fontSet->GetFontPatternAt(0);
if (HasChar(basePattern, aCh)) {
return nsRefPtr<gfxFont>(GetBaseFont()).forget();
}
nextFont = 1;
}
// Pango, GLib, and HarfBuzz all happen to use the same script codes.
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 (PRUint32 i = nextFont;
FcPattern *pattern = fontSet->GetFontPatternAt(i);
++i) {
if (pattern == basePattern) {
continue; // already checked basePattern
}
if (HasChar(pattern, aCh)) {
return nsRefPtr<gfxFont>(fontSet->GetFontAt(i)).forget();
}
}
return nsnull;
}
/**
** gfxFcFont
**/
cairo_user_data_key_t gfxFcFont::sGfxFontKey;
gfxFcFont::gfxFcFont(cairo_scaled_font_t *aCairoFont,
gfxFontEntry *aFontEntry,
const gfxFontStyle *aFontStyle)
: gfxFT2FontBase(aCairoFont, aFontEntry, aFontStyle),
mPangoFont()
{
cairo_scaled_font_set_user_data(mScaledFont, &sGfxFontKey, this, NULL);
}
// The gfxFcFont keeps (only) a toggle_ref on mPangoFont.
// While mPangoFont has other references, a reference (from mPangoFont) to the
// gfxFcFont is held. While mPangoFont has no other references, the reference
// to the gfxFcFont is removed.
static void
PangoFontToggleNotify(gpointer data, GObject* object, gboolean is_last_ref)
{
gfxFcFont *font = static_cast<gfxFcFont*>(data);
if (is_last_ref) { // gfxFcFont has last ref to PangoFont
NS_RELEASE(font);
} else {
NS_ADDREF(font);
}
}
void
gfxFcFont::MakePangoFont()
{
// Switch from a normal reference to a toggle_ref.
nsAutoRef<PangoFont> pangoFont(gfxPangoFcFont::NewFont(this, mFontPattern));
mPangoFont = pangoFont;
g_object_add_toggle_ref(G_OBJECT(mPangoFont), PangoFontToggleNotify, this);
}
gfxFcFont::~gfxFcFont()
{
cairo_scaled_font_set_user_data(mScaledFont, &sGfxFontKey, NULL, NULL);
if (mPangoFont) {
GFX_PANGO_FC_FONT(mPangoFont)->ForgetGfxFont();
g_object_remove_toggle_ref(G_OBJECT(mPangoFont),
PangoFontToggleNotify, this);
}
}
PRBool
gfxFcFont::InitTextRun(gfxContext *aContext,
gfxTextRun *aTextRun,
const PRUnichar *aString,
PRUint32 aRunStart,
PRUint32 aRunLength,
PRInt32 aRunScript)
{
PRBool useFastPath = PR_FALSE;
#if defined(ENABLE_FAST_PATH_8BIT)
if (CanTakeFastPath(aTextRun->GetFlags())) {
PRUint32 allBits = 0;
for (PRUint32 i = aRunStart; i < aRunStart + aRunLength; ++i) {
allBits |= aString[i];
}
useFastPath = (allBits & 0xFF00) == 0;
}
if (useFastPath &&
NS_SUCCEEDED(InitGlyphRunFast(aTextRun, aString,
aRunStart, aRunLength))) {
return PR_TRUE;
}
#endif
const PangoScript script = static_cast<PangoScript>(aRunScript);
PRBool ok = InitGlyphRunWithPango(aTextRun,
aString, aRunStart, aRunLength, script);
NS_WARN_IF_FALSE(ok, "shaper failed, expect scrambled or missing text");
return ok;
}
/* static */ void
gfxPangoFontGroup::Shutdown()
{
if (gPangoFontMap) {
if (PANGO_IS_FC_FONT_MAP (gPangoFontMap)) {
// This clears circular references from the fontmap to itself
// through its fonts. (This is actually unnecessary with Pango
// versions >= 1.22.)
pango_fc_font_map_shutdown(PANGO_FC_FONT_MAP(gPangoFontMap));
}
g_object_unref(gPangoFontMap);
gPangoFontMap = NULL;
}
// Resetting gFTLibrary in case this is wanted again after a
// cairo_debug_reset_static_data.
gFTLibrary = NULL;
}
/* static */ gfxFontEntry *
gfxPangoFontGroup::NewFontEntry(const gfxProxyFontEntry &aProxyEntry,
const nsAString& aFullname)
{
gfxFontconfigUtils *utils = gfxFontconfigUtils::GetFontconfigUtils();
if (!utils)
return nsnull;
// 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 nsnull;
NS_ConvertUTF16toUTF8 fullname(aFullname);
FcPatternAddString(pattern, FC_FULLNAME,
gfxFontconfigUtils::ToFcChar8(fullname));
FcConfigSubstitute(NULL, 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(aProxyEntry, fonts);
}
return nsnull;
}
/* 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(NS_LITERAL_STRING("sans-serif"),
&style, nsnull);
gfxFcFont *font = fontGroup->GetBaseFont();
if (!font)
return NULL;
gfxFT2LockedFace face(font);
if (!face.get())
return NULL;
gFTLibrary = face.get()->glyph->library;
}
return gFTLibrary;
}
/* static */ gfxFontEntry *
gfxPangoFontGroup::NewFontEntry(const gfxProxyFontEntry &aProxyEntry,
const PRUint8 *aFontData, PRUint32 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 NULL 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 nsnull;
}
return new gfxDownloadedFcFontEntry(aProxyEntry, 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)
{
nsAutoRef<FcPattern> renderPattern
(FcFontRenderPrepare(NULL, aRequestedPattern, aFontPattern));
nsRefPtr<gfxFcFont> font = GetOrMakeFont(renderPattern);
if (!font->mFontPattern) {
font->mFontPattern = aFontPattern;
}
return font.forget();
}
/* static */
already_AddRefed<gfxFcFont>
gfxFcFont::GetOrMakeFont(FcPattern *aRenderPattern, gfxPangoFcFont *aPangoFont)
{
nsRefPtr<gfxFcFont> font = GetOrMakeFont(aRenderPattern);
if (!font->mPangoFont) {
font->mPangoFont = PANGO_FONT(aPangoFont);
g_object_add_toggle_ref(G_OBJECT(aPangoFont),
PangoFontToggleNotify, font);
}
return font.forget();
}
/* static */
already_AddRefed<gfxFcFont>
gfxFcFont::GetOrMakeFont(FcPattern *aPattern)
{
cairo_scaled_font_t *cairoFont = CreateScaledFont(aPattern);
nsRefPtr<gfxFcFont> font = static_cast<gfxFcFont*>
(cairo_scaled_font_get_user_data(cairoFont, &sGfxFontKey));
if (!font) {
gfxFloat size = GetPixelSize(aPattern);
// Shouldn't actually need to take too much care about the correct
// name or style, as size is the only thing expected to be important.
PRUint8 style = gfxFontconfigUtils::GetThebesStyle(aPattern);
PRUint16 weight = gfxFontconfigUtils::GetThebesWeight(aPattern);
// The LangSet in the FcPattern does not have an order so there is no
// one particular language to choose and converting the set to a
// string through FcNameUnparse() is more trouble than it's worth.
nsIAtom *language = gfxAtoms::en; // TODO: get the correct language?
// FIXME: Pass a real stretch based on aPattern!
gfxFontStyle fontStyle(style, weight, NS_FONT_STRETCH_NORMAL,
size, language, 0.0,
PR_TRUE, PR_FALSE, PR_FALSE,
NS_LITERAL_STRING(""),
NS_LITERAL_STRING("")); // TODO: no opentype feature support here yet
nsRefPtr<gfxFontEntry> fe;
FcChar8 *fc_file;
if (FcPatternGetString(aPattern,
FC_FILE, 0, &fc_file) == FcResultMatch) {
int index;
if (FcPatternGetInteger(aPattern,
FC_INDEX, 0, &index) != FcResultMatch) {
// cairo won't know what to do with this pattern.
NS_NOTREACHED("No index in pattern for font face from file");
index = 0;
}
// Get a unique name for the font face data from the file and id.
nsAutoString name;
AppendUTF8toUTF16(gfxFontconfigUtils::ToCString(fc_file), name);
if (index != 0) {
name.AppendLiteral("/");
name.AppendInt(index);
}
fe = new gfxFontEntry(name);
} else {
fe = GetDownloadedFontEntry(aPattern);
if (!fe) {
// cairo won't know which font to open without a file.
// (We don't create fonts from an FT_Face.)
NS_NOTREACHED("Fonts without a file is not a web font!?");
fe = new gfxFontEntry(nsString());
}
}
// 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 aPattern, 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.
font = new gfxFcFont(cairoFont, fe, &fontStyle);
}
cairo_scaled_font_destroy(cairoFont);
return font.forget();
}
static PangoFontMap *
GetPangoFontMap()
{
if (!gPangoFontMap) {
gPangoFontMap = gfxPangoFontMap::NewFontMap();
}
return gPangoFontMap;
}
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);
if (font) {
const gfxFont::Metrics& metrics = font->GetMetrics();
// 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.
*
**/
#if defined(ENABLE_FAST_PATH_8BIT)
static PRBool
CanTakeFastPath(PRUint32 aFlags)
{
// Can take fast path only if OPTIMIZE_SPEED is set and IS_RTL isn't.
// We need to always use Pango for RTL text, in case glyph mirroring is
// required.
PRBool speed = aFlags & gfxTextRunFactory::TEXT_OPTIMIZE_SPEED;
PRBool isRTL = aFlags & gfxTextRunFactory::TEXT_IS_RTL;
return speed && !isRTL;
}
#endif
static void ReleaseDownloadedFontEntry(void *data)
{
gfxDownloadedFcFontEntry *downloadedFontEntry =
static_cast<gfxDownloadedFcFontEntry*>(data);
NS_RELEASE(downloadedFontEntry);
}
// This will fetch an existing scaled_font if one exists.
static cairo_scaled_font_t *
CreateScaledFont(FcPattern *aPattern)
{
cairo_font_face_t *face = cairo_ft_font_face_create_for_pattern(aPattern);
// If the face is created from a web font entry, hold a reference to the
// font entry to keep the font face data.
gfxDownloadedFcFontEntry *downloadedFontEntry =
GetDownloadedFontEntry(aPattern);
if (downloadedFontEntry &&
cairo_font_face_status(face) == CAIRO_STATUS_SUCCESS) {
static cairo_user_data_key_t sFontEntryKey;
// Check whether this is a new cairo face
void *currentEntry =
cairo_font_face_get_user_data(face, &sFontEntryKey);
if (!currentEntry) {
NS_ADDREF(downloadedFontEntry);
cairo_font_face_set_user_data(face, &sFontEntryKey,
downloadedFontEntry,
ReleaseDownloadedFontEntry);
} else {
NS_ASSERTION(currentEntry == downloadedFontEntry,
"Unexpected cairo font face!");
}
}
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);
// 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.
#ifdef MOZ_GFX_OPTIMIZE_MOBILE
cairo_font_options_set_hint_metrics(fontOptions, CAIRO_HINT_METRICS_OFF);
#else
cairo_font_options_set_hint_metrics(fontOptions, CAIRO_HINT_METRICS_ON);
#endif
// 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;
#ifndef MOZ_GFX_OPTIMIZE_MOBILE
if (FcPatternGetBool(aPattern, FC_HINTING, 0, &hinting) != FcResultMatch) {
hinting = FcTrue;
}
#endif
cairo_hint_style_t hint_style;
if (!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(face, &fontMatrix, &identityMatrix,
fontOptions);
cairo_font_options_destroy(fontOptions);
cairo_font_face_destroy(face);
NS_ASSERTION(cairo_scaled_font_status(scaledFont) == CAIRO_STATUS_SUCCESS,
"Failed to create scaled font");
return scaledFont;
}
static void
SetupClusterBoundaries(gfxTextRun* aTextRun, const gchar *aUTF8, PRUint32 aUTF8Length,
PRUint32 aUTF16Offset, PangoAnalysis *aAnalysis)
{
if (aTextRun->GetFlags() & gfxTextRunFactory::TEXT_IS_8BIT) {
// 8-bit text doesn't have clusters.
// XXX is this true in all languages???
// behdad: don't think so. Czech for example IIRC has a
// 'ch' grapheme.
return;
}
// Pango says "the array of PangoLogAttr passed in must have at least N+1
// elements, if there are N characters in the text being broken".
// Could use g_utf8_strlen(aUTF8, aUTF8Length) + 1 but the memory savings
// may not be worth the call.
nsAutoTArray<PangoLogAttr,2000> buffer;
if (!buffer.AppendElements(aUTF8Length + 1))
return;
pango_break(aUTF8, aUTF8Length, aAnalysis,
buffer.Elements(), buffer.Length());
const gchar *p = aUTF8;
const gchar *end = aUTF8 + aUTF8Length;
const PangoLogAttr *attr = buffer.Elements();
gfxTextRun::CompressedGlyph g;
while (p < end) {
if (!attr->is_cursor_position) {
aTextRun->SetGlyphs(aUTF16Offset, g.SetComplex(PR_FALSE, PR_TRUE, 0), nsnull);
}
++aUTF16Offset;
gunichar ch = g_utf8_get_char(p);
NS_ASSERTION(ch != 0, "Shouldn't have NUL in pango_break");
NS_ASSERTION(!IS_SURROGATE(ch), "Shouldn't have surrogates in UTF8");
if (ch >= 0x10000) {
// set glyph info for the UTF-16 low surrogate
aTextRun->SetGlyphs(aUTF16Offset, g.SetComplex(PR_FALSE, PR_FALSE, 0), nsnull);
++aUTF16Offset;
}
// We produced this utf8 so we don't need to worry about malformed stuff
p = g_utf8_next_char(p);
++attr;
}
}
static PRInt32
ConvertPangoToAppUnits(PRInt32 aCoordinate, PRUint32 aAppUnitsPerDevUnit)
{
PRInt64 v = (PRInt64(aCoordinate)*aAppUnitsPerDevUnit + PANGO_SCALE/2)/PANGO_SCALE;
return PRInt32(v);
}
/**
* Given a run of Pango glyphs that should be treated as a single
* cluster/ligature, store them in the textrun at the appropriate character
* and set the other characters involved to be ligature/cluster continuations
* as appropriate.
*/
static nsresult
SetGlyphsForCharacterGroup(const PangoGlyphInfo *aGlyphs, PRUint32 aGlyphCount,
gfxTextRun *aTextRun,
const gchar *aUTF8, PRUint32 aUTF8Length,
PRUint32 *aUTF16Offset,
PangoGlyphUnit aOverrideSpaceWidth)
{
PRUint32 utf16Offset = *aUTF16Offset;
PRUint32 textRunLength = aTextRun->GetLength();
const PRUint32 appUnitsPerDevUnit = aTextRun->GetAppUnitsPerDevUnit();
const gfxTextRun::CompressedGlyph *charGlyphs = aTextRun->GetCharacterGlyphs();
// Override the width of a space, but only for spaces that aren't
// clustered with something else (like a freestanding diacritical mark)
PangoGlyphUnit width = aGlyphs[0].geometry.width;
if (aOverrideSpaceWidth && aUTF8[0] == ' ' &&
(utf16Offset + 1 == textRunLength ||
charGlyphs[utf16Offset].IsClusterStart())) {
width = aOverrideSpaceWidth;
}
PRInt32 advance = ConvertPangoToAppUnits(width, appUnitsPerDevUnit);
gfxTextRun::CompressedGlyph g;
PRBool atClusterStart = aTextRun->IsClusterStart(utf16Offset);
// See if we fit in the compressed area.
if (aGlyphCount == 1 && advance >= 0 && atClusterStart &&
aGlyphs[0].geometry.x_offset == 0 &&
aGlyphs[0].geometry.y_offset == 0 &&
!IS_EMPTY_GLYPH(aGlyphs[0].glyph) &&
gfxTextRun::CompressedGlyph::IsSimpleAdvance(advance) &&
gfxTextRun::CompressedGlyph::IsSimpleGlyphID(aGlyphs[0].glyph)) {
aTextRun->SetSimpleGlyph(utf16Offset,
g.SetSimpleGlyph(advance, aGlyphs[0].glyph));
} else {
nsAutoTArray<gfxTextRun::DetailedGlyph,10> detailedGlyphs;
if (!detailedGlyphs.AppendElements(aGlyphCount))
return NS_ERROR_OUT_OF_MEMORY;
PRInt32 direction = aTextRun->IsRightToLeft() ? -1 : 1;
PRUint32 pangoIndex = direction > 0 ? 0 : aGlyphCount - 1;
PRUint32 detailedIndex = 0;
for (PRUint32 i = 0; i < aGlyphCount; ++i) {
const PangoGlyphInfo &glyph = aGlyphs[pangoIndex];
pangoIndex += direction;
// The zero width characters return empty glyph ID at
// shaping; we should skip these.
if (IS_EMPTY_GLYPH(glyph.glyph))
continue;
gfxTextRun::DetailedGlyph *details = &detailedGlyphs[detailedIndex];
++detailedIndex;
details->mGlyphID = glyph.glyph;
NS_ASSERTION(details->mGlyphID == glyph.glyph,
"Seriously weird glyph ID detected!");
details->mAdvance =
ConvertPangoToAppUnits(glyph.geometry.width,
appUnitsPerDevUnit);
details->mXOffset =
float(glyph.geometry.x_offset)*appUnitsPerDevUnit/PANGO_SCALE;
details->mYOffset =
float(glyph.geometry.y_offset)*appUnitsPerDevUnit/PANGO_SCALE;
}
g.SetComplex(atClusterStart, PR_TRUE, detailedIndex);
aTextRun->SetGlyphs(utf16Offset, g, detailedGlyphs.Elements());
}
// Check for ligatures and set *aUTF16Offset.
const gchar *p = aUTF8;
const gchar *end = aUTF8 + aUTF8Length;
while (1) {
// Skip the CompressedGlyph that we have added, but check if the
// character was supposed to be ignored. If it's supposed to be ignored,
// overwrite the textrun entry with an invisible missing-glyph.
gunichar ch = g_utf8_get_char(p);
NS_ASSERTION(!IS_SURROGATE(ch), "surrogates should not appear in UTF8");
if (ch >= 0x10000) {
// Skip surrogate
++utf16Offset;
}
NS_ASSERTION(!gfxFontGroup::IsInvalidChar(PRUnichar(ch)),
"Invalid character detected");
++utf16Offset;
// We produced this UTF8 so we don't need to worry about malformed stuff
p = g_utf8_next_char(p);
if (p >= end)
break;
if (utf16Offset >= textRunLength) {
NS_ERROR("Someone has added too many glyphs!");
return NS_ERROR_FAILURE;
}
g.SetComplex(aTextRun->IsClusterStart(utf16Offset), PR_FALSE, 0);
aTextRun->SetGlyphs(utf16Offset, g, nsnull);
}
*aUTF16Offset = utf16Offset;
return NS_OK;
}
static nsresult
SetGlyphs(gfxTextRun *aTextRun, const gchar *aUTF8, PRUint32 aUTF8Length,
PRUint32 *aUTF16Offset, PangoGlyphString *aGlyphs,
PangoGlyphUnit aOverrideSpaceWidth)
{
gint numGlyphs = aGlyphs->num_glyphs;
PangoGlyphInfo *glyphs = aGlyphs->glyphs;
const gint *logClusters = aGlyphs->log_clusters;
// We cannot make any assumptions about the order of glyph clusters
// provided by pango_shape (see 375864), so we work through the UTF8 text
// and process the glyph clusters in logical order.
// logGlyphs is like an inverse of logClusters. For each UTF8 byte:
// >= 0 indicates that the byte is first in a cluster and
// gives the position of the starting glyph for the cluster.
// -1 indicates that the byte does not start a cluster.
nsAutoTArray<gint,2000> logGlyphs;
if (!logGlyphs.AppendElements(aUTF8Length + 1))
return NS_ERROR_OUT_OF_MEMORY;
PRUint32 utf8Index = 0;
for(; utf8Index < aUTF8Length; ++utf8Index)
logGlyphs[utf8Index] = -1;
logGlyphs[aUTF8Length] = numGlyphs;
gint lastCluster = -1; // != utf8Index
for (gint glyphIndex = 0; glyphIndex < numGlyphs; ++glyphIndex) {
gint thisCluster = logClusters[glyphIndex];
if (thisCluster != lastCluster) {
lastCluster = thisCluster;
NS_ASSERTION(0 <= thisCluster && thisCluster < gint(aUTF8Length),
"garbage from pango_shape - this is bad");
logGlyphs[thisCluster] = glyphIndex;
}
}
PRUint32 utf16Offset = *aUTF16Offset;
PRUint32 textRunLength = aTextRun->GetLength();
utf8Index = 0;
// The next glyph cluster in logical order.
gint nextGlyphClusterStart = logGlyphs[utf8Index];
NS_ASSERTION(nextGlyphClusterStart >= 0, "No glyphs! - NUL in string?");
while (utf8Index < aUTF8Length) {
if (utf16Offset >= textRunLength) {
NS_ERROR("Someone has added too many glyphs!");
return NS_ERROR_FAILURE;
}
gint glyphClusterStart = nextGlyphClusterStart;
// Find the utf8 text associated with this glyph cluster.
PRUint32 clusterUTF8Start = utf8Index;
// Check we are consistent with pango_break data.
NS_ASSERTION(aTextRun->GetCharacterGlyphs()->IsClusterStart(),
"Glyph cluster not aligned on character cluster.");
do {
++utf8Index;
nextGlyphClusterStart = logGlyphs[utf8Index];
} while (nextGlyphClusterStart < 0);
const gchar *clusterUTF8 = &aUTF8[clusterUTF8Start];
PRUint32 clusterUTF8Length = utf8Index - clusterUTF8Start;
PRBool haveMissingGlyph = PR_FALSE;
gint glyphIndex = glyphClusterStart;
// It's now unncecessary to do NUL handling here.
do {
if (IS_MISSING_GLYPH(glyphs[glyphIndex].glyph)) {
// Does pango ever provide more than one glyph in the
// cluster if there is a missing glyph?
// behdad: yes
haveMissingGlyph = PR_TRUE;
}
glyphIndex++;
} while (glyphIndex < numGlyphs &&
logClusters[glyphIndex] == gint(clusterUTF8Start));
nsresult rv;
if (haveMissingGlyph) {
SetMissingGlyphs(aTextRun, clusterUTF8, clusterUTF8Length,
&utf16Offset);
} else {
rv = SetGlyphsForCharacterGroup(&glyphs[glyphClusterStart],
glyphIndex - glyphClusterStart,
aTextRun,
clusterUTF8, clusterUTF8Length,
&utf16Offset, aOverrideSpaceWidth);
NS_ENSURE_SUCCESS(rv,rv);
}
}
*aUTF16Offset = utf16Offset;
return NS_OK;
}
static void
SetMissingGlyphs(gfxTextRun *aTextRun, const gchar *aUTF8,
PRUint32 aUTF8Length, PRUint32 *aUTF16Offset)
{
PRUint32 utf16Offset = *aUTF16Offset;
PRUint32 textRunLength = aTextRun->GetLength();
for (PRUint32 index = 0; index < aUTF8Length;) {
if (utf16Offset >= textRunLength) {
NS_ERROR("Someone has added too many glyphs!");
break;
}
gunichar ch = g_utf8_get_char(aUTF8 + index);
aTextRun->SetMissingGlyph(utf16Offset, ch);
++utf16Offset;
NS_ASSERTION(!IS_SURROGATE(ch), "surrogates should not appear in UTF8");
if (ch >= 0x10000)
++utf16Offset;
// We produced this UTF8 so we don't need to worry about malformed stuff
index = g_utf8_next_char(aUTF8 + index) - aUTF8;
}
*aUTF16Offset = utf16Offset;
}
static void
InitGlyphRunWithPangoAnalysis(gfxTextRun *aTextRun,
const gchar *aUTF8, PRUint32 aUTF8Length,
PRUint32 *aUTF16Offset,
PangoAnalysis *aAnalysis,
PangoGlyphUnit aOverrideSpaceWidth)
{
PRUint32 utf16Offset = *aUTF16Offset;
PangoGlyphString *glyphString = pango_glyph_string_new();
const gchar *p = aUTF8;
const gchar *end = p + aUTF8Length;
while (p < end) {
if (*p == 0) {
aTextRun->SetMissingGlyph(utf16Offset, 0);
++p;
++utf16Offset;
continue;
}
// It's necessary to loop over pango_shape as it treats
// NULs as string terminators
const gchar *text = p;
do {
++p;
} while(p < end && *p != 0);
gint len = p - text;
pango_shape(text, len, aAnalysis, glyphString);
SetupClusterBoundaries(aTextRun, text, len, utf16Offset, aAnalysis);
SetGlyphs(aTextRun, text, len, &utf16Offset, glyphString,
aOverrideSpaceWidth);
}
pango_glyph_string_free(glyphString);
*aUTF16Offset = utf16Offset;
}
// PangoAnalysis is part of Pango's ABI but over time extra fields have been
// inserted into padding. This union is used so that the code here can be
// compiled against older Pango versions but run against newer versions.
typedef union {
PangoAnalysis pango;
// This struct matches PangoAnalysis from Pango version
// 1.16.5 to 1.28.1 (at least).
struct {
PangoEngineShape *shape_engine;
PangoEngineLang *lang_engine;
PangoFont *font;
guint8 level;
guint8 gravity; /* PangoGravity */
guint8 flags;
guint8 script; /* PangoScript */
PangoLanguage *language;
GSList *extra_attrs;
} local;
} PangoAnalysisUnion;
PRBool
gfxFcFont::InitGlyphRunWithPango(gfxTextRun *aTextRun,
const PRUnichar *aString,
PRUint32 aRunStart, PRUint32 aRunLength,
PangoScript aScript)
{
NS_ConvertUTF16toUTF8 utf8(aString + aRunStart, aRunLength);
PangoFont *font = GetPangoFont();
gfxPangoFontGroup *fontGroup =
static_cast<gfxPangoFontGroup*>(aTextRun->GetFontGroup());
hb_language_t languageOverride = NULL;
if (fontGroup->GetStyle()->languageOverride) {
languageOverride =
hb_ot_tag_to_language(fontGroup->GetStyle()->languageOverride);
} else if (GetFontEntry()->mLanguageOverride) {
languageOverride =
hb_ot_tag_to_language(GetFontEntry()->mLanguageOverride);
}
PangoLanguage *language;
if (languageOverride) {
language =
pango_language_from_string(hb_language_to_string(languageOverride));
} else {
language = fontGroup->GetPangoLanguage();
// The language that we have here is often not as good an indicator for
// the run as the script. This is not so important for the PangoMaps
// here as all the default Pango shape and lang engines are selected
// by script only (not language) anyway, but may be important in the
// PangoAnalysis as the shaper sometimes accesses language-specific
// tables.
const PangoScript script = static_cast<PangoScript>(aScript);
PangoLanguage *scriptLang;
if ((!language ||
!pango_language_includes_script(language, script)) &&
(scriptLang = pango_script_get_sample_language(script))) {
language = scriptLang;
}
}
static GQuark engineLangId =
g_quark_from_static_string(PANGO_ENGINE_TYPE_LANG);
static GQuark renderNoneId =
g_quark_from_static_string(PANGO_RENDER_TYPE_NONE);
PangoMap *langMap = pango_find_map(language, engineLangId, renderNoneId);
static GQuark engineShapeId =
g_quark_from_static_string(PANGO_ENGINE_TYPE_SHAPE);
static GQuark renderFcId =
g_quark_from_static_string(PANGO_RENDER_TYPE_FC);
PangoMap *shapeMap = pango_find_map(language, engineShapeId, renderFcId);
if (!shapeMap) {
return PR_FALSE;
}
// The preferred shape engine for language and script
PangoEngineShape *shapeEngine =
PANGO_ENGINE_SHAPE(pango_map_get_engine(shapeMap, aScript));
if (!shapeEngine) {
return PR_FALSE;
}
PangoEngineShapeClass *shapeClass = static_cast<PangoEngineShapeClass*>
(g_type_class_peek(PANGO_TYPE_ENGINE_SHAPE));
// The |covers| method in the PangoEngineShape base class, which is the
// method used by Pango shapers, merely copies the fontconfig coverage map
// to a PangoCoverage and checks that the character is supported. We've
// already checked for character support, so we can avoid this copy for
// these shapers.
//
// With SIL Graphite shapers, however, |covers| also checks that the font
// is a Graphite font. (bug 397860)
if (!shapeClass ||
PANGO_ENGINE_SHAPE_GET_CLASS(shapeEngine)->covers != shapeClass->covers)
{
GSList *exact_engines;
GSList *fallback_engines;
pango_map_get_engines(shapeMap, aScript,
&exact_engines, &fallback_engines);
GSList *engines = g_slist_concat(exact_engines, fallback_engines);
for (GSList *link = engines; link; link = link->next) {
PangoEngineShape *engine = PANGO_ENGINE_SHAPE(link->data);
PangoCoverageLevel (*covers)(PangoEngineShape*, PangoFont*,
PangoLanguage*, gunichar) =
PANGO_ENGINE_SHAPE_GET_CLASS(shapeEngine)->covers;
if ((shapeClass && covers == shapeClass->covers) ||
covers(engine, font, language, ' ') != PANGO_COVERAGE_NONE)
{
shapeEngine = engine;
break;
}
}
g_slist_free(engines); // Frees exact and fallback links
}
PangoAnalysisUnion analysis;
memset(&analysis, 0, sizeof(analysis));
// For pango_shape
analysis.local.shape_engine = shapeEngine;
// For pango_break
analysis.local.lang_engine =
PANGO_ENGINE_LANG(pango_map_get_engine(langMap, aScript));
analysis.local.font = font;
analysis.local.level = aTextRun->IsRightToLeft() ? 1 : 0;
// gravity and flags are used in Pango 1.14.10 and newer.
//
// PANGO_GRAVITY_SOUTH is what we want for upright horizontal text. The
// constant is not available when compiling with older Pango versions, but
// is zero so the zero memset initialization is sufficient.
//
// Pango uses non-zero flags for vertical gravities only
// (up to version 1.28 at least), so using zero is fine for flags too.
#if 0
analysis.local.gravity = PANGO_GRAVITY_SOUTH;
analysis.local.flags = 0;
#endif
// Only used in Pango 1.16.5 and newer.
analysis.local.script = aScript;
analysis.local.language = language;
// Non-font attributes. Not used here.
analysis.local.extra_attrs = NULL;
PangoGlyphUnit spaceWidth =
moz_pango_units_from_double(GetMetrics().spaceWidth);
PRUint32 utf16Offset = aRunStart;
InitGlyphRunWithPangoAnalysis(aTextRun, utf8.get(), utf8.Length(),
&utf16Offset, &analysis.pango, spaceWidth);
return PR_TRUE;
}
#if defined(ENABLE_FAST_PATH_8BIT)
nsresult
gfxFcFont::InitGlyphRunFast(gfxTextRun *aTextRun, const PRUnichar *aString,
PRUint32 aStart, PRUint32 aLength)
{
gfxTextRun::CompressedGlyph g;
const PRUint32 appUnitsPerDevUnit = aTextRun->GetAppUnitsPerDevUnit();
PRUint32 end = aStart + aLength;
for (PRUint32 utf16Offset = aStart; utf16Offset < end; ++utf16Offset) {
PRUint32 ch = aString[utf16Offset];
NS_ASSERTION(!gfxFontGroup::IsInvalidChar(ch), "Invalid char detected");
if (ch == 0) {
// treat this null byte as a missing glyph. Pango
// doesn't create glyphs for these, not even missing-glyphs.
aTextRun->SetMissingGlyph(utf16Offset, 0);
} else {
// This code is used for 8-bit text only.
NS_ASSERTION(!IS_SURROGATE(ch), "Need to add surrogate support");
FT_UInt glyph = GetGlyph(ch);
if (!glyph) // character not in font,
return NS_ERROR_FAILURE; // fallback to CreateGlyphRunsItemizing
cairo_text_extents_t extents;
GetGlyphExtents(glyph, &extents);
PRInt32 advance = NS_lround(extents.x_advance * appUnitsPerDevUnit);
if (advance >= 0 &&
gfxTextRun::CompressedGlyph::IsSimpleAdvance(advance) &&
gfxTextRun::CompressedGlyph::IsSimpleGlyphID(glyph)) {
aTextRun->SetSimpleGlyph(utf16Offset,
g.SetSimpleGlyph(advance, glyph));
} else {
gfxTextRun::DetailedGlyph details;
details.mGlyphID = glyph;
NS_ASSERTION(details.mGlyphID == glyph,
"Seriously weird glyph ID detected!");
details.mAdvance = advance;
details.mXOffset = 0;
details.mYOffset = 0;
g.SetComplex(aTextRun->IsClusterStart(utf16Offset), PR_TRUE, 1);
aTextRun->SetGlyphs(utf16Offset, g, &details);
}
}
}
return NS_OK;
}
#endif
/* static */
PangoLanguage *
GuessPangoLanguage(nsIAtom *aLanguage)
{
if (!aLanguage)
return NULL;
// Pango and fontconfig won't understand mozilla's internal langGroups, so
// find a real language.
nsCAutoString lang;
gfxFontconfigUtils::GetSampleLangForGroup(aLanguage, &lang);
if (lang.IsEmpty())
return NULL;
return pango_language_from_string(lang.get());
}
#ifdef MOZ_WIDGET_GTK2
/***************************************************************************
*
* 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
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