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gecko/gfx/thebes/gfxFT2Fonts.cpp

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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):
*
* 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 ***** */
#if defined(MOZ_WIDGET_GTK2)
#include "gfxPlatformGtk.h"
#define gfxToolkitPlatform gfxPlatformGtk
#elif defined(MOZ_WIDGET_QT)
#include <qfontinfo.h>
#include "gfxQtPlatform.h"
#define gfxToolkitPlatform gfxQtPlatform
#elif defined(XP_WIN)
#include "gfxWindowsPlatform.h"
#define gfxToolkitPlatform gfxWindowsPlatform
#include "gfxFT2FontList.h"
#elif defined(ANDROID)
#include "gfxAndroidPlatform.h"
#define gfxToolkitPlatform gfxAndroidPlatform
#endif
#include "gfxTypes.h"
#include "gfxFT2Fonts.h"
#include "gfxFT2FontBase.h"
#include "gfxFT2Utils.h"
#include <locale.h>
#include "cairo-ft.h"
#include FT_TRUETYPE_TAGS_H
#include FT_TRUETYPE_TABLES_H
#include "gfxFontUtils.h"
#include "gfxHarfBuzzShaper.h"
#include "gfxUnicodeProperties.h"
#include "gfxAtoms.h"
#include "nsTArray.h"
#include "nsUnicodeRange.h"
#include "nsCRT.h"
#include "prlog.h"
#include "prinit.h"
#include "mozilla/Preferences.h"
using namespace mozilla;
static PRLogModuleInfo *gFontLog = PR_NewLogModule("ft2fonts");
static const char *sCJKLangGroup[] = {
"ja",
"ko",
"zh-cn",
"zh-hk",
"zh-tw"
};
#define COUNT_OF_CJK_LANG_GROUP 5
// rounding and truncation functions for a Freetype floating point number
// (FT26Dot6) stored in a 32bit integer with high 26 bits for the integer
// part and low 6 bits for the fractional part.
#define MOZ_FT_ROUND(x) (((x) + 32) & ~63) // 63 = 2^6 - 1
#define MOZ_FT_TRUNC(x) ((x) >> 6)
#define CONVERT_DESIGN_UNITS_TO_PIXELS(v, s) \
MOZ_FT_TRUNC(MOZ_FT_ROUND(FT_MulFix((v) , (s))))
/**
* FontEntry
*/
FontEntry::~FontEntry()
{
// Do nothing for mFTFace here since FTFontDestroyFunc is called by cairo.
mFTFace = nsnull;
#ifndef ANDROID
if (mFontFace) {
cairo_font_face_destroy(mFontFace);
mFontFace = nsnull;
}
#endif
}
gfxFont*
FontEntry::CreateFontInstance(const gfxFontStyle *aFontStyle, PRBool aNeedsBold) {
already_AddRefed<gfxFT2Font> font = gfxFT2Font::GetOrMakeFont(this, aFontStyle, aNeedsBold);
return font.get();
}
/* static */
FontEntry*
FontEntry::CreateFontEntry(const gfxProxyFontEntry &aProxyEntry,
const PRUint8 *aFontData,
PRUint32 aLength)
{
// Ownership of aFontData is passed in here; the fontEntry must
// retain it as long as the FT_Face needs it, and ensure it is
// eventually deleted.
FT_Face face;
FT_Error error =
FT_New_Memory_Face(gfxToolkitPlatform::GetPlatform()->GetFTLibrary(),
aFontData, aLength, 0, &face);
if (error != FT_Err_Ok) {
NS_Free((void*)aFontData);
return nsnull;
}
FontEntry* fe = FontEntry::CreateFontEntryFromFace(face, aFontData);
if (fe) {
fe->mItalic = aProxyEntry.mItalic;
fe->mWeight = aProxyEntry.mWeight;
fe->mStretch = aProxyEntry.mStretch;
}
return fe;
}
class FTUserFontData {
public:
FTUserFontData(FT_Face aFace, const PRUint8* aData)
: mFace(aFace), mFontData(aData)
{
}
~FTUserFontData()
{
FT_Done_Face(mFace);
if (mFontData) {
NS_Free((void*)mFontData);
}
}
private:
FT_Face mFace;
const PRUint8 *mFontData;
};
static void
FTFontDestroyFunc(void *data)
{
FTUserFontData *userFontData = static_cast<FTUserFontData*>(data);
delete userFontData;
}
/* static */ FontEntry*
FontEntry::CreateFontEntryFromFace(FT_Face aFace, const PRUint8 *aFontData) {
static cairo_user_data_key_t key;
if (!aFace->family_name) {
FT_Done_Face(aFace);
return nsnull;
}
// Construct font name from family name and style name, regular fonts
// do not have the modifier by convention.
NS_ConvertUTF8toUTF16 fontName(aFace->family_name);
if (aFace->style_name && strcmp("Regular", aFace->style_name)) {
fontName.AppendLiteral(" ");
AppendUTF8toUTF16(aFace->style_name, fontName);
}
FontEntry *fe = new FontEntry(fontName);
fe->mItalic = aFace->style_flags & FT_STYLE_FLAG_ITALIC;
fe->mFTFace = aFace;
#ifdef MOZ_GFX_OPTIMIZE_MOBILE
fe->mFontFace = cairo_ft_font_face_create_for_ft_face(aFace, FT_LOAD_NO_AUTOHINT | FT_LOAD_NO_HINTING);
#else
fe->mFontFace = cairo_ft_font_face_create_for_ft_face(aFace, 0);
#endif
FTUserFontData *userFontData = new FTUserFontData(aFace, aFontData);
cairo_font_face_set_user_data(fe->mFontFace, &key,
userFontData, FTFontDestroyFunc);
TT_OS2 *os2 = static_cast<TT_OS2*>(FT_Get_Sfnt_Table(aFace, ft_sfnt_os2));
PRUint16 os2weight = 0;
if (os2 && os2->version != 0xffff) {
// Technically, only 100 to 900 are valid, but some fonts
// have this set wrong -- e.g. "Microsoft Logo Bold Italic" has
// it set to 6 instead of 600. We try to be nice and handle that
// as well.
if (os2->usWeightClass >= 100 && os2->usWeightClass <= 900)
os2weight = os2->usWeightClass;
else if (os2->usWeightClass >= 1 && os2->usWeightClass <= 9)
os2weight = os2->usWeightClass * 100;
}
if (os2weight != 0)
fe->mWeight = os2weight;
else if (aFace->style_flags & FT_STYLE_FLAG_BOLD)
fe->mWeight = 700;
else
fe->mWeight = 400;
NS_ASSERTION(fe->mWeight >= 100 && fe->mWeight <= 900, "Invalid final weight in font!");
return fe;
}
FontEntry*
gfxFT2Font::GetFontEntry()
{
return static_cast<FontEntry*> (mFontEntry.get());
}
cairo_font_face_t *
FontEntry::CairoFontFace()
{
static cairo_user_data_key_t key;
if (!mFontFace) {
FT_Face face;
FT_New_Face(gfxToolkitPlatform::GetPlatform()->GetFTLibrary(), mFilename.get(), mFTFontIndex, &face);
mFTFace = face;
#ifdef MOZ_GFX_OPTIMIZE_MOBILE
mFontFace = cairo_ft_font_face_create_for_ft_face(face, FT_LOAD_NO_AUTOHINT | FT_LOAD_NO_HINTING);
#else
mFontFace = cairo_ft_font_face_create_for_ft_face(face, 0);
#endif
FTUserFontData *userFontData = new FTUserFontData(face, nsnull);
cairo_font_face_set_user_data(mFontFace, &key,
userFontData, FTFontDestroyFunc);
}
return mFontFace;
}
nsresult
FontEntry::ReadCMAP()
{
if (mCmapInitialized) {
return NS_OK;
}
// attempt this once, if errors occur leave a blank cmap
mCmapInitialized = PR_TRUE;
AutoFallibleTArray<PRUint8,16384> buffer;
nsresult rv = GetFontTable(TTAG_cmap, buffer);
if (NS_SUCCEEDED(rv)) {
PRPackedBool unicodeFont;
PRPackedBool symbolFont;
rv = gfxFontUtils::ReadCMAP(buffer.Elements(), buffer.Length(),
mCharacterMap, mUVSOffset,
unicodeFont, symbolFont);
}
mHasCmapTable = NS_SUCCEEDED(rv);
return rv;
}
nsresult
FontEntry::GetFontTable(PRUint32 aTableTag, FallibleTArray<PRUint8>& aBuffer)
{
// Ensure existence of mFTFace
CairoFontFace();
NS_ENSURE_TRUE(mFTFace, NS_ERROR_FAILURE);
FT_Error status;
FT_ULong len = 0;
status = FT_Load_Sfnt_Table(mFTFace, aTableTag, 0, nsnull, &len);
NS_ENSURE_TRUE(status == 0, NS_ERROR_FAILURE);
NS_ENSURE_TRUE(len != 0, NS_ERROR_FAILURE);
if (!aBuffer.SetLength(len)) {
return NS_ERROR_OUT_OF_MEMORY;
}
PRUint8 *buf = aBuffer.Elements();
status = FT_Load_Sfnt_Table(mFTFace, aTableTag, 0, buf, &len);
NS_ENSURE_TRUE(status == 0, NS_ERROR_FAILURE);
return NS_OK;
}
FontEntry *
FontFamily::FindFontEntry(const gfxFontStyle& aFontStyle)
{
PRBool needsBold = PR_FALSE;
return static_cast<FontEntry*>(FindFontForStyle(aFontStyle, needsBold));
}
void FontFamily::AddFontFileAndIndex(nsCString aFilename, PRUint32 aIndex)
{
SetHasStyles(PR_FALSE);
mFilenames.AppendElement(new FileAndIndex(aFilename, aIndex));
}
void
FontFamily::FindStyleVariations()
{
if (mHasStyles) {
return;
}
mHasStyles = PR_TRUE;
for (int i = 0; i < mFilenames.Length(); i++) {
FT_Face face;
gfxToolkitPlatform* platform = gfxToolkitPlatform::GetPlatform();
if (FT_Err_Ok == FT_New_Face(platform->GetFTLibrary(),
mFilenames[i].filename.get(),
mFilenames[i].index, &face)) {
FontEntry* fe = FontEntry::CreateFontEntryFromFace(face);
if (fe)
AddFontEntry(fe);
}
}
mFilenames.Clear();
SetHasStyles(PR_TRUE);
}
/**
* gfxFT2FontGroup
*/
PRBool
gfxFT2FontGroup::FontCallback(const nsAString& fontName,
const nsACString& genericName,
PRBool aUseFontSet,
void *closure)
{
nsTArray<nsString> *sa = static_cast<nsTArray<nsString>*>(closure);
if (!fontName.IsEmpty() && !sa->Contains(fontName)) {
sa->AppendElement(fontName);
#ifdef DEBUG_pavlov
printf(" - %s\n", NS_ConvertUTF16toUTF8(fontName).get());
#endif
}
return PR_TRUE;
}
gfxFT2FontGroup::gfxFT2FontGroup(const nsAString& families,
const gfxFontStyle *aStyle,
gfxUserFontSet *aUserFontSet)
: gfxFontGroup(families, aStyle, aUserFontSet)
{
#ifdef DEBUG_pavlov
printf("Looking for %s\n", NS_ConvertUTF16toUTF8(families).get());
#endif
nsTArray<nsString> familyArray;
ForEachFont(FontCallback, &familyArray);
if (familyArray.Length() == 0) {
nsAutoString prefFamilies;
gfxToolkitPlatform::GetPlatform()->GetPrefFonts(aStyle->language, prefFamilies, nsnull);
if (!prefFamilies.IsEmpty()) {
ForEachFont(prefFamilies, aStyle->language, FontCallback, &familyArray);
}
}
if (familyArray.Length() == 0) {
#if defined(MOZ_WIDGET_QT) /* FIXME DFB */
printf("failde to find a font. sadface\n");
// We want to get rid of this entirely at some point, but first we need real lists of fonts.
QFont defaultFont;
QFontInfo fi (defaultFont);
familyArray.AppendElement(nsDependentString(static_cast<const PRUnichar *>(fi.family().utf16())));
#elif defined(MOZ_WIDGET_GTK2)
FcResult result;
FcChar8 *family = nsnull;
FcPattern* pat = FcPatternCreate();
FcPattern *match = FcFontMatch(nsnull, pat, &result);
if (match)
FcPatternGetString(match, FC_FAMILY, 0, &family);
if (family)
familyArray.AppendElement(NS_ConvertUTF8toUTF16((char*)family));
#elif defined(XP_WIN)
HGDIOBJ hGDI = ::GetStockObject(SYSTEM_FONT);
LOGFONTW logFont;
if (hGDI && ::GetObjectW(hGDI, sizeof(logFont), &logFont))
familyArray.AppendElement(nsDependentString(logFont.lfFaceName));
#elif defined(ANDROID)
familyArray.AppendElement(NS_LITERAL_STRING("Droid Sans"));
#else
#error "Platform not supported"
#endif
}
for (PRUint32 i = 0; i < familyArray.Length(); i++) {
nsRefPtr<gfxFT2Font> font = gfxFT2Font::GetOrMakeFont(familyArray[i], &mStyle);
if (font) {
mFonts.AppendElement(font);
}
}
NS_ASSERTION(mFonts.Length() > 0, "We need at least one font in a fontgroup");
}
gfxFT2FontGroup::~gfxFT2FontGroup()
{
}
gfxFontGroup *
gfxFT2FontGroup::Copy(const gfxFontStyle *aStyle)
{
return new gfxFT2FontGroup(mFamilies, aStyle, nsnull);
}
// Helper function to return the leading UTF-8 character in a char pointer
// as 32bit number. Also sets the length of the current character (i.e. the
// offset to the next one) in the second argument
PRUint32 getUTF8CharAndNext(const PRUint8 *aString, PRUint8 *aLength)
{
*aLength = 1;
if (aString[0] < 0x80) { // normal 7bit ASCII char
return aString[0];
}
if ((aString[0] >> 5) == 6) { // two leading ones -> two bytes
*aLength = 2;
return ((aString[0] & 0x1F) << 6) + (aString[1] & 0x3F);
}
if ((aString[0] >> 4) == 14) { // three leading ones -> three bytes
*aLength = 3;
return ((aString[0] & 0x0F) << 12) + ((aString[1] & 0x3F) << 6) +
(aString[2] & 0x3F);
}
if ((aString[0] >> 4) == 15) { // four leading ones -> four bytes
*aLength = 4;
return ((aString[0] & 0x07) << 18) + ((aString[1] & 0x3F) << 12) +
((aString[2] & 0x3F) << 6) + (aString[3] & 0x3F);
}
return aString[0];
}
static PRBool
AddFontNameToArray(const nsAString& aName,
const nsACString& aGenericName,
PRBool aUseFontSet,
void *aClosure)
{
if (!aName.IsEmpty()) {
nsTArray<nsString> *list = static_cast<nsTArray<nsString> *>(aClosure);
if (list->IndexOf(aName) == list->NoIndex)
list->AppendElement(aName);
}
return PR_TRUE;
}
void
gfxFT2FontGroup::FamilyListToArrayList(const nsString& aFamilies,
nsIAtom *aLangGroup,
nsTArray<nsRefPtr<gfxFontEntry> > *aFontEntryList)
{
nsAutoTArray<nsString, 15> fonts;
ForEachFont(aFamilies, aLangGroup, AddFontNameToArray, &fonts);
PRUint32 len = fonts.Length();
for (PRUint32 i = 0; i < len; ++i) {
const nsString& str = fonts[i];
nsRefPtr<gfxFontEntry> fe = (gfxToolkitPlatform::GetPlatform()->FindFontEntry(str, mStyle));
aFontEntryList->AppendElement(fe);
}
}
void gfxFT2FontGroup::GetPrefFonts(nsIAtom *aLangGroup, nsTArray<nsRefPtr<gfxFontEntry> >& aFontEntryList)
{
NS_ASSERTION(aLangGroup, "aLangGroup is null");
gfxToolkitPlatform *platform = gfxToolkitPlatform::GetPlatform();
nsAutoTArray<nsRefPtr<gfxFontEntry>, 5> fonts;
nsCAutoString key;
aLangGroup->ToUTF8String(key);
key.Append("-");
key.AppendInt(GetStyle()->style);
key.Append("-");
key.AppendInt(GetStyle()->weight);
if (!platform->GetPrefFontEntries(key, &fonts)) {
nsString fontString;
platform->GetPrefFonts(aLangGroup, fontString);
if (fontString.IsEmpty())
return;
FamilyListToArrayList(fontString, aLangGroup, &fonts);
platform->SetPrefFontEntries(key, fonts);
}
aFontEntryList.AppendElements(fonts);
}
static PRInt32 GetCJKLangGroupIndex(const char *aLangGroup) {
PRInt32 i;
for (i = 0; i < COUNT_OF_CJK_LANG_GROUP; i++) {
if (!PL_strcasecmp(aLangGroup, sCJKLangGroup[i]))
return i;
}
return -1;
}
// this function assigns to the array passed in.
void gfxFT2FontGroup::GetCJKPrefFonts(nsTArray<nsRefPtr<gfxFontEntry> >& aFontEntryList) {
gfxToolkitPlatform *platform = gfxToolkitPlatform::GetPlatform();
nsCAutoString key("x-internal-cjk-");
key.AppendInt(mStyle.style);
key.Append("-");
key.AppendInt(mStyle.weight);
if (!platform->GetPrefFontEntries(key, &aFontEntryList)) {
NS_ENSURE_TRUE(Preferences::GetRootBranch(), );
// Add the CJK pref fonts from accept languages, the order should be same order
nsAdoptingCString list = Preferences::GetLocalizedCString("intl.accept_languages");
if (!list.IsEmpty()) {
const char kComma = ',';
const char *p, *p_end;
list.BeginReading(p);
list.EndReading(p_end);
while (p < p_end) {
while (nsCRT::IsAsciiSpace(*p)) {
if (++p == p_end)
break;
}
if (p == p_end)
break;
const char *start = p;
while (++p != p_end && *p != kComma)
/* nothing */ ;
nsCAutoString lang(Substring(start, p));
lang.CompressWhitespace(PR_FALSE, PR_TRUE);
PRInt32 index = GetCJKLangGroupIndex(lang.get());
if (index >= 0) {
nsCOMPtr<nsIAtom> atom = do_GetAtom(sCJKLangGroup[index]);
GetPrefFonts(atom, aFontEntryList);
}
p++;
}
}
// Add the system locale
#ifdef XP_WIN
switch (::GetACP()) {
case 932: GetPrefFonts(gfxAtoms::ja, aFontEntryList); break;
case 936: GetPrefFonts(gfxAtoms::zh_cn, aFontEntryList); break;
case 949: GetPrefFonts(gfxAtoms::ko, aFontEntryList); break;
// XXX Don't we need to append gfxAtoms::zh_hk if the codepage is 950?
case 950: GetPrefFonts(gfxAtoms::zh_tw, aFontEntryList); break;
}
#else
const char *ctype = setlocale(LC_CTYPE, NULL);
if (ctype) {
if (!PL_strncasecmp(ctype, "ja", 2)) {
GetPrefFonts(gfxAtoms::ja, aFontEntryList);
} else if (!PL_strncasecmp(ctype, "zh_cn", 5)) {
GetPrefFonts(gfxAtoms::zh_cn, aFontEntryList);
} else if (!PL_strncasecmp(ctype, "zh_hk", 5)) {
GetPrefFonts(gfxAtoms::zh_hk, aFontEntryList);
} else if (!PL_strncasecmp(ctype, "zh_tw", 5)) {
GetPrefFonts(gfxAtoms::zh_tw, aFontEntryList);
} else if (!PL_strncasecmp(ctype, "ko", 2)) {
GetPrefFonts(gfxAtoms::ko, aFontEntryList);
}
}
#endif
// last resort...
GetPrefFonts(gfxAtoms::ja, aFontEntryList);
GetPrefFonts(gfxAtoms::ko, aFontEntryList);
GetPrefFonts(gfxAtoms::zh_cn, aFontEntryList);
GetPrefFonts(gfxAtoms::zh_hk, aFontEntryList);
GetPrefFonts(gfxAtoms::zh_tw, aFontEntryList);
platform->SetPrefFontEntries(key, aFontEntryList);
}
}
already_AddRefed<gfxFT2Font>
gfxFT2FontGroup::WhichFontSupportsChar(const nsTArray<nsRefPtr<gfxFontEntry> >& aFontEntryList, PRUint32 aCh)
{
for (PRUint32 i = 0; i < aFontEntryList.Length(); i++) {
gfxFontEntry *fe = aFontEntryList[i].get();
if (fe->HasCharacter(aCh)) {
nsRefPtr<gfxFT2Font> font =
gfxFT2Font::GetOrMakeFont(static_cast<FontEntry*>(fe), &mStyle);
return font.forget();
}
}
return nsnull;
}
already_AddRefed<gfxFont>
gfxFT2FontGroup::WhichPrefFontSupportsChar(PRUint32 aCh)
{
if (aCh > 0xFFFF)
return nsnull;
nsRefPtr<gfxFT2Font> selectedFont;
// check out the style's language
nsAutoTArray<nsRefPtr<gfxFontEntry>, 5> fonts;
GetPrefFonts(mStyle.language, fonts);
selectedFont = WhichFontSupportsChar(fonts, aCh);
// otherwise search prefs
if (!selectedFont) {
PRUint32 unicodeRange = FindCharUnicodeRange(aCh);
/* special case CJK */
if (unicodeRange == kRangeSetCJK) {
if (PR_LOG_TEST(gFontLog, PR_LOG_DEBUG)) {
PR_LOG(gFontLog, PR_LOG_DEBUG, (" - Trying to find fonts for: CJK"));
}
nsAutoTArray<nsRefPtr<gfxFontEntry>, 15> fonts;
GetCJKPrefFonts(fonts);
selectedFont = WhichFontSupportsChar(fonts, aCh);
} else {
nsIAtom *langGroup = LangGroupFromUnicodeRange(unicodeRange);
if (langGroup) {
PR_LOG(gFontLog, PR_LOG_DEBUG, (" - Trying to find fonts for: %s", nsAtomCString(langGroup).get()));
nsAutoTArray<nsRefPtr<gfxFontEntry>, 5> fonts;
GetPrefFonts(langGroup, fonts);
selectedFont = WhichFontSupportsChar(fonts, aCh);
}
}
}
if (selectedFont) {
nsRefPtr<gfxFont> f = static_cast<gfxFont*>(selectedFont.get());
return f.forget();
}
return nsnull;
}
already_AddRefed<gfxFont>
gfxFT2FontGroup::WhichSystemFontSupportsChar(PRUint32 aCh)
{
#ifdef XP_WIN
FontEntry *fe = static_cast<FontEntry*>
(gfxPlatformFontList::PlatformFontList()->FindFontForChar(aCh, GetFontAt(0)));
if (fe) {
nsRefPtr<gfxFT2Font> f = gfxFT2Font::GetOrMakeFont(fe, &mStyle);
nsRefPtr<gfxFont> font = f.get();
return font.forget();
}
#else
nsRefPtr<gfxFont> selectedFont;
nsRefPtr<gfxFont> refFont = GetFontAt(0);
gfxToolkitPlatform *platform = gfxToolkitPlatform::GetPlatform();
selectedFont = platform->FindFontForChar(aCh, refFont);
if (selectedFont)
return selectedFont.forget();
#endif
return nsnull;
}
/**
* gfxFT2Font
*/
PRBool
gfxFT2Font::InitTextRun(gfxContext *aContext,
gfxTextRun *aTextRun,
const PRUnichar *aString,
PRUint32 aRunStart,
PRUint32 aRunLength,
PRInt32 aRunScript,
PRBool aPreferPlatformShaping)
{
PRBool ok = PR_FALSE;
if (gfxPlatform::GetPlatform()->UseHarfBuzzForScript(aRunScript)) {
if (!mHarfBuzzShaper) {
gfxFT2LockedFace face(this);
mFUnitsConvFactor = face.XScale();
mHarfBuzzShaper = new gfxHarfBuzzShaper(this);
}
ok = mHarfBuzzShaper->InitTextRun(aContext, aTextRun, aString,
aRunStart, aRunLength, aRunScript);
}
if (!ok) {
aTextRun->AdjustAdvancesForSyntheticBold(aRunStart, aRunLength);
AddRange(aTextRun, aString, aRunStart, aRunLength);
}
return PR_TRUE;
}
void
gfxFT2Font::AddRange(gfxTextRun *aTextRun, const PRUnichar *str, PRUint32 offset, PRUint32 len)
{
const PRUint32 appUnitsPerDevUnit = aTextRun->GetAppUnitsPerDevUnit();
// we'll pass this in/figure it out dynamically, but at this point there can be only one face.
gfxFT2LockedFace faceLock(this);
FT_Face face = faceLock.get();
gfxTextRun::CompressedGlyph g;
const gfxFT2Font::CachedGlyphData *cgd = nsnull, *cgdNext = nsnull;
FT_UInt spaceGlyph = GetSpaceGlyph();
for (PRUint32 i = 0; i < len; i++) {
PRUint32 ch = str[offset + i];
if (ch == 0) {
// treat this null byte as a missing glyph, don't create a glyph for it
aTextRun->SetMissingGlyph(offset + i, 0);
continue;
}
NS_ASSERTION(!gfxFontGroup::IsInvalidChar(ch), "Invalid char detected");
if (cgdNext) {
cgd = cgdNext;
cgdNext = nsnull;
} else {
cgd = GetGlyphDataForChar(ch);
}
FT_UInt gid = cgd->glyphIndex;
PRInt32 advance = 0;
if (gid == 0) {
advance = -1; // trigger the missing glyphs case below
} else {
// find next character and its glyph -- in case they exist
// and exist in the current font face -- to compute kerning
PRUint32 chNext = 0;
FT_UInt gidNext = 0;
FT_Pos lsbDeltaNext = 0;
if (FT_HAS_KERNING(face) && i + 1 < len) {
chNext = str[offset + i + 1];
if (chNext != 0) {
cgdNext = GetGlyphDataForChar(chNext);
gidNext = cgdNext->glyphIndex;
if (gidNext && gidNext != spaceGlyph)
lsbDeltaNext = cgdNext->lsbDelta;
}
}
advance = cgd->xAdvance;
// now add kerning to the current glyph's advance
if (chNext && gidNext) {
FT_Vector kerning; kerning.x = 0;
FT_Get_Kerning(face, gid, gidNext, FT_KERNING_DEFAULT, &kerning);
advance += kerning.x;
if (cgd->rsbDelta - lsbDeltaNext >= 32) {
advance -= 64;
} else if (cgd->rsbDelta - lsbDeltaNext < -32) {
advance += 64;
}
}
// convert 26.6 fixed point to app units
// round rather than truncate to nearest pixel
// because these advances are often scaled
advance = ((advance * appUnitsPerDevUnit + 32) >> 6);
}
#ifdef DEBUG_thebes_2
printf(" gid=%d, advance=%d (%s)\n", gid, advance,
NS_LossyConvertUTF16toASCII(font->GetName()).get());
#endif
if (advance >= 0 &&
gfxTextRun::CompressedGlyph::IsSimpleAdvance(advance) &&
gfxTextRun::CompressedGlyph::IsSimpleGlyphID(gid)) {
aTextRun->SetSimpleGlyph(offset + i, g.SetSimpleGlyph(advance, gid));
} else if (gid == 0) {
// gid = 0 only happens when the glyph is missing from the font
aTextRun->SetMissingGlyph(offset + i, ch);
} else {
gfxTextRun::DetailedGlyph details;
details.mGlyphID = gid;
NS_ASSERTION(details.mGlyphID == gid, "Seriously weird glyph ID detected!");
details.mAdvance = advance;
details.mXOffset = 0;
details.mYOffset = 0;
g.SetComplex(aTextRun->IsClusterStart(offset + i), PR_TRUE, 1);
aTextRun->SetGlyphs(offset + i, g, &details);
}
}
}
gfxFT2Font::gfxFT2Font(cairo_scaled_font_t *aCairoFont,
FontEntry *aFontEntry,
const gfxFontStyle *aFontStyle,
PRBool aNeedsBold)
: gfxFT2FontBase(aCairoFont, aFontEntry, aFontStyle)
{
NS_ASSERTION(mFontEntry, "Unable to find font entry for font. Something is whack.");
if (aNeedsBold) {
mSyntheticBoldOffset = 1.0;
}
mCharGlyphCache.Init(64);
}
gfxFT2Font::~gfxFT2Font()
{
}
cairo_font_face_t *
gfxFT2Font::CairoFontFace()
{
return GetFontEntry()->CairoFontFace();
}
static cairo_scaled_font_t *
CreateScaledFont(FontEntry *aFontEntry, const gfxFontStyle *aStyle)
{
cairo_scaled_font_t *scaledFont = NULL;
cairo_matrix_t sizeMatrix;
cairo_matrix_t identityMatrix;
// XXX deal with adjusted size
cairo_matrix_init_scale(&sizeMatrix, aStyle->size, aStyle->size);
cairo_matrix_init_identity(&identityMatrix);
// synthetic oblique by skewing via the font matrix
PRBool needsOblique = (!aFontEntry->mItalic && (aStyle->style & (FONT_STYLE_ITALIC | FONT_STYLE_OBLIQUE)));
if (needsOblique) {
const double kSkewFactor = 0.25;
cairo_matrix_t style;
cairo_matrix_init(&style,
1, //xx
0, //yx
-1 * kSkewFactor, //xy
1, //yy
0, //x0
0); //y0
cairo_matrix_multiply(&sizeMatrix, &sizeMatrix, &style);
}
cairo_font_options_t *fontOptions = cairo_font_options_create();
#ifdef MOZ_GFX_OPTIMIZE_MOBILE
cairo_font_options_set_hint_metrics(fontOptions, CAIRO_HINT_METRICS_OFF);
#endif
scaledFont = cairo_scaled_font_create(aFontEntry->CairoFontFace(),
&sizeMatrix,
&identityMatrix, fontOptions);
cairo_font_options_destroy(fontOptions);
NS_ASSERTION(cairo_scaled_font_status(scaledFont) == CAIRO_STATUS_SUCCESS,
"Failed to make scaled font");
return scaledFont;
}
/**
* Look up the font in the gfxFont cache. If we don't find it, create one.
* In either case, add a ref, append it to the aFonts array, and return it ---
* except for OOM in which case we do nothing and return null.
*/
already_AddRefed<gfxFT2Font>
gfxFT2Font::GetOrMakeFont(const nsAString& aName, const gfxFontStyle *aStyle, PRBool aNeedsBold)
{
FontEntry *fe = static_cast<FontEntry*>
(gfxToolkitPlatform::GetPlatform()->FindFontEntry(aName, *aStyle));
if (!fe) {
NS_WARNING("Failed to find font entry for font!");
return nsnull;
}
nsRefPtr<gfxFT2Font> font = GetOrMakeFont(fe, aStyle, aNeedsBold);
return font.forget();
}
already_AddRefed<gfxFT2Font>
gfxFT2Font::GetOrMakeFont(FontEntry *aFontEntry, const gfxFontStyle *aStyle, PRBool aNeedsBold)
{
nsRefPtr<gfxFont> font = gfxFontCache::GetCache()->Lookup(aFontEntry, aStyle);
if (!font) {
cairo_scaled_font_t *scaledFont = CreateScaledFont(aFontEntry, aStyle);
font = new gfxFT2Font(scaledFont, aFontEntry, aStyle, aNeedsBold);
cairo_scaled_font_destroy(scaledFont);
if (!font)
return nsnull;
gfxFontCache::GetCache()->AddNew(font);
}
gfxFont *f = nsnull;
font.swap(f);
return static_cast<gfxFT2Font *>(f);
}
void
gfxFT2Font::FillGlyphDataForChar(PRUint32 ch, CachedGlyphData *gd)
{
gfxFT2LockedFace faceLock(this);
FT_Face face = faceLock.get();
FT_UInt gid = FT_Get_Char_Index(face, ch);
if (gid == 0) {
// this font doesn't support this char!
NS_ASSERTION(gid != 0, "We don't have a glyph, but font indicated that it supported this char in tables?");
gd->glyphIndex = 0;
return;
}
#ifdef MOZ_GFX_OPTIMIZE_MOBILE
FT_Error err = FT_Load_Glyph(face, gid, FT_LOAD_NO_AUTOHINT | FT_LOAD_NO_HINTING);
#else
FT_Error err = FT_Load_Glyph(face, gid, FT_LOAD_DEFAULT);
#endif
if (err) {
// hmm, this is weird, we failed to load a glyph that we had?
NS_WARNING("Failed to load glyph that we got from Get_Char_index");
gd->glyphIndex = 0;
return;
}
gd->glyphIndex = gid;
gd->lsbDelta = face->glyph->lsb_delta;
gd->rsbDelta = face->glyph->rsb_delta;
gd->xAdvance = face->glyph->advance.x;
}
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