fontcachechromiumwin.cpp

linux下开源浏览器WebKit的源码,市面上的很多商用浏览器都是移植自WebKit

/*
 * Copyright (C) 2006, 2007 Apple Computer, Inc.
 * Copyright (c) 2006, 2007, 2008, 2009 Google Inc. All rights reserved.
 * 
 * Redistribution and use in source and binary forms, with or without
 * modification, are permitted provided that the following conditions are
 * met:
 * 
 *     * Redistributions of source code must retain the above copyright
 * notice, this list of conditions and the following disclaimer.
 *     * Redistributions in binary form must reproduce the above
 * copyright notice, this list of conditions and the following disclaimer
 * in the documentation and/or other materials provided with the
 * distribution.
 *     * Neither the name of Google Inc. nor the names of its
 * contributors may be used to endorse or promote products derived from
 * this software without specific prior written permission.
 * 
 * THIS SOFTWARE IS PROVIDED BY THE COPYRIGHT HOLDERS AND CONTRIBUTORS
 * "AS IS" AND ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT
 * LIMITED TO, THE IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR
 * A PARTICULAR PURPOSE ARE DISCLAIMED. IN NO EVENT SHALL THE COPYRIGHT
 * OWNER OR CONTRIBUTORS BE LIABLE FOR ANY DIRECT, INDIRECT, INCIDENTAL,
 * SPECIAL, EXEMPLARY, OR CONSEQUENTIAL DAMAGES (INCLUDING, BUT NOT
 * LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS OR SERVICES; LOSS OF USE,
 * DATA, OR PROFITS; OR BUSINESS INTERRUPTION) HOWEVER CAUSED AND ON ANY
 * THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT LIABILITY, OR TORT
 * (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY OUT OF THE USE
 * OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF SUCH DAMAGE.
 */

#include "config.h"
#include "FontCache.h"

#include "ChromiumBridge.h"
#include "Font.h"
#include "FontUtilsChromiumWin.h"
#include "HashMap.h"
#include "HashSet.h"
#include "SimpleFontData.h"
#include "StringHash.h"
#include <unicode/uniset.h>

#include <windows.h>
#include <objidl.h>
#include <mlang.h>

using std::min;

namespace WebCore
{

void FontCache::platformInit()
{
    // Not needed on Windows.
}

// FIXME: consider adding to WebKit String class
static bool charactersAreAllASCII(const String& s)
{
    return charactersAreAllASCII(s.characters(), s.length());
}

// When asked for a CJK font with a native name under a non-CJK locale or
// asked for a CJK font with a Romanized name under a CJK locale,
// |GetTextFace| (after |CreateFont*|) returns a 'bogus' value (e.g. Arial).
// This is not consistent with what MSDN says !!
// Therefore, before we call |CreateFont*|, we have to map a Romanized name to 
// the corresponding native name under a CJK locale and vice versa 
// under a non-CJK locale.
// See the corresponding gecko bugs at 
// https://bugzilla.mozilla.org/show_bug.cgi?id=373952
// https://bugzilla.mozilla.org/show_bug.cgi?id=231426
static bool LookupAltName(const String& name, String& altName)
{
    struct FontCodepage {
        WCHAR* name;
        int codePage;
    };

    struct NamePair {
        WCHAR* name;
        FontCodepage altNameCodepage;
    };

    const int japaneseCodepage = 932;
    const int simplifiedChineseCodepage = 936;
    const int koreanCodepage = 949;
    const int traditionalChineseCodepage = 950;

    // FIXME(jungshik) : This list probably covers 99% of cases.
    // To cover the remaining 1% and cut down the file size,
    // consider accessing 'NAME' table of a truetype font
    // using |GetFontData| and caching the mapping.
    // In the table below, the ASCII keys are all lower-cased for
    // case-insensitive matching.
    static const NamePair namePairs[] = {
        // ＭＳ Ｐゴシック, MS PGothic
        {L"\xFF2D\xFF33 \xFF30\x30B4\x30B7\x30C3\x30AF", {L"MS PGothic", japaneseCodepage}},
        {L"ms pgothic", {L"\xFF2D\xFF33 \xFF30\x30B4\x30B7\x30C3\x30AF", japaneseCodepage}},
        // ＭＳ Ｐ明朝, MS PMincho
        {L"\xFF2D\xFF33 \xFF30\x660E\x671D", {L"MS PMincho", japaneseCodepage}},
        {L"ms pmincho", {L"\xFF2D\xFF33 \xFF30\x660E\x671D", japaneseCodepage}},
        // ＭＳゴシック, MS Gothic
        {L"\xFF2D\xFF33 \x30B4\x30B7\x30C3\x30AF", {L"MS Gothic", japaneseCodepage}},
        {L"ms gothic", {L"\xFF2D\xFF33 \x30B4\x30B7\x30C3\x30AF", japaneseCodepage}},
        // ＭＳ 明朝, MS Mincho
        {L"\xFF2D\xFF33 \x660E\x671D", {L"MS Mincho", japaneseCodepage}},
        {L"ms mincho", {L"\xFF2D\xFF33 \x660E\x671D", japaneseCodepage}},
        // メイリオ, Meiryo
        {L"\x30E1\x30A4\x30EA\x30AA", {L"Meiryo", japaneseCodepage}},
        {L"meiryo", {L"\x30E1\x30A4\x30EA\x30AA", japaneseCodepage}},
        // 바탕, Batang
        {L"\xBC14\xD0D5", {L"Batang", koreanCodepage}},
        {L"batang", {L"\xBC14\xD0D5", koreanCodepage}},
        // 바탕체, Batangche
        {L"\xBC14\xD0D5\xCCB4", {L"Batangche", koreanCodepage}},
        {L"batangche", {L"\xBC14\xD0D5\xCCB4", koreanCodepage}},
        // 굴림, Gulim
        {L"\xAD74\xB9BC", {L"Gulim", koreanCodepage}},
        {L"gulim", {L"\xAD74\xB9BC", koreanCodepage}},
        // 굴림체, Gulimche
        {L"\xAD74\xB9BC\xCCB4", {L"Gulimche", koreanCodepage}},
        {L"gulimche", {L"\xAD74\xB9BC\xCCB4", koreanCodepage}},
        // 돋움, Dotum
        {L"\xB3CB\xC6C0", {L"Dotum", koreanCodepage}},
        {L"dotum", {L"\xB3CB\xC6C0", koreanCodepage}},
        // 돋움체, Dotumche
        {L"\xB3CB\xC6C0\xCCB4", {L"Dotumche", koreanCodepage}},
        {L"dotumche", {L"\xB3CB\xC6C0\xCCB4", koreanCodepage}},
        // 궁서, Gungsuh
        {L"\xAD81\xC11C", {L"Gungsuh", koreanCodepage}},
        {L"gungsuh", {L"\xAD81\xC11C", koreanCodepage}},
        // 궁서체, Gungsuhche
        {L"\xAD81\xC11C\xCCB4", {L"Gungsuhche", koreanCodepage}},
        {L"gungsuhche", {L"\xAD81\xC11C\xCCB4", koreanCodepage}},
        // 맑은 고딕, Malgun Gothic
        {L"\xB9D1\xC740 \xACE0\xB515", {L"Malgun Gothic", koreanCodepage}},
        {L"malgun gothic", {L"\xB9D1\xC740 \xACE0\xB515", koreanCodepage}},
        // 宋体, SimSun
        {L"\x5B8B\x4F53", {L"SimSun", simplifiedChineseCodepage}},
        {L"simsun", {L"\x5B8B\x4F53", simplifiedChineseCodepage}},
        // 黑体, SimHei
        {L"\x9ED1\x4F53", {L"SimHei", simplifiedChineseCodepage}},
        {L"simhei", {L"\x9ED1\x4F53", simplifiedChineseCodepage}},
        // 新宋体, NSimSun
        {L"\x65B0\x5B8B\x4F53", {L"NSimSun", simplifiedChineseCodepage}},
        {L"nsimsun", {L"\x65B0\x5B8B\x4F53", simplifiedChineseCodepage}},
        // 微软雅黑, Microsoft Yahei
        {L"\x5FAE\x8F6F\x96C5\x9ED1", {L"Microsoft Yahei", simplifiedChineseCodepage}},
        {L"microsoft yahei", {L"\x5FAE\x8F6F\x96C5\x9ED1", simplifiedChineseCodepage}},
        // 仿宋, FangSong
        {L"\x4EFF\x5B8B",  {L"FangSong", simplifiedChineseCodepage}},
        {L"fangsong", {L"\x4EFF\x5B8B", simplifiedChineseCodepage}},
        // 楷体, KaiTi
        {L"\x6977\x4F53", {L"KaiTi", simplifiedChineseCodepage}},
        {L"kaiti", {L"\x6977\x4F53", simplifiedChineseCodepage}},
        // 仿宋_GB2312, FangSong_GB2312
        {L"\x4EFF\x5B8B_GB2312",  {L"FangSong_GB2312", simplifiedChineseCodepage}},
        {L"fangsong_gb2312", {L"\x4EFF\x5B8B_gb2312", simplifiedChineseCodepage}},
        // 楷体_GB2312, KaiTi_GB2312
        {L"\x6977\x4F53", {L"KaiTi_GB2312", simplifiedChineseCodepage}},
        {L"kaiti_gb2312", {L"\x6977\x4F53_gb2312", simplifiedChineseCodepage}},
        // 新細明體, PMingLiu
        {L"\x65B0\x7D30\x660E\x9AD4", {L"PMingLiu", traditionalChineseCodepage}},
        {L"pmingliu", {L"\x65B0\x7D30\x660E\x9AD4", traditionalChineseCodepage}},
        // 細明體, MingLiu
        {L"\x7D30\x660E\x9AD4", {L"MingLiu", traditionalChineseCodepage}},
        {L"mingliu", {L"\x7D30\x660E\x9AD4", traditionalChineseCodepage}},
        // 微軟正黑體, Microsoft JhengHei
        {L"\x5FAE\x8EDF\x6B63\x9ED1\x9AD4", {L"Microsoft JhengHei", traditionalChineseCodepage}},
        {L"microsoft jhengHei", {L"\x5FAE\x8EDF\x6B63\x9ED1\x9AD4", traditionalChineseCodepage}},
        // 標楷體, DFKai-SB
        {L"\x6A19\x6977\x9AD4", {L"DFKai-SB", traditionalChineseCodepage}},
        {L"dfkai-sb", {L"\x6A19\x6977\x9AD4", traditionalChineseCodepage}},
        // WenQuanYi Zen Hei
        {L"\x6587\x6cc9\x9a5b\x6b63\x9ed1", {L"WenQuanYi Zen Hei", traditionalChineseCodepage}},
        {L"wenquanyi zen hei", {L"\x6587\x6cc9\x9a5b\x6b63\x9ed1", traditionalChineseCodepage}},
        // WenQuanYi Zen Hei
        {L"\x6587\x6cc9\x9a7f\x6b63\x9ed1", {L"WenQuanYi Zen Hei", simplifiedChineseCodepage}},
        {L"wenquanyi zen hei", {L"\x6587\x6cc9\x9a7f\x6b63\x9ed1", simplifiedChineseCodepage}},
        // AR PL ShanHeiSun Uni,
        {L"\x6587\x9f0e\x0050\x004c\x7d30\x4e0a\x6d77\x5b8b\x0055\x006e\x0069",
         {L"AR PL ShanHeiSun Uni", traditionalChineseCodepage}},
        {L"ar pl shanheisun uni",
         {L"\x6587\x9f0e\x0050\x004c\x7d30\x4e0a\x6d77\x5b8b\x0055\x006e\x0069", traditionalChineseCodepage}},
        // AR PL ShanHeiSun Uni,
        {L"\x6587\x9f0e\x0050\x004c\x7ec6\x4e0a\x6d77\x5b8b\x0055\x006e\x0069",
         {L"AR PL ShanHeiSun Uni", simplifiedChineseCodepage}},
        {L"ar pl shanheisun uni",
         {L"\x6587\x9f0e\x0050\x004c\x7ec6\x4e0a\x6d77\x5b8b\x0055\x006e\x0069", simplifiedChineseCodepage}},
        // AR PL ZenKai Uni
        // Traditional Chinese and Simplified Chinese names are
        // identical.
        {L"\x6587\x0050\x004C\x4E2D\x6977\x0055\x006E\x0069", {L"AR PL ZenKai Uni", traditionalChineseCodepage}},
        {L"ar pl zenkai uni", {L"\x6587\x0050\x004C\x4E2D\x6977\x0055\x006E\x0069", traditionalChineseCodepage}},
        {L"\x6587\x0050\x004C\x4E2D\x6977\x0055\x006E\x0069", {L"AR PL ZenKai Uni", simplifiedChineseCodepage}},
        {L"ar pl zenkai uni", {L"\x6587\x0050\x004C\x4E2D\x6977\x0055\x006E\x0069", simplifiedChineseCodepage}},
    };

    typedef HashMap<String, const FontCodepage*> NameMap;
    static NameMap* fontNameMap = 0;

    if (!fontNameMap) {
        size_t numElements = sizeof(namePairs) / sizeof(NamePair);
        fontNameMap = new NameMap;
        for (size_t i = 0; i < numElements; ++i)
            fontNameMap->set(String(namePairs[i].name), &(namePairs[i].altNameCodepage));
    }

    bool isAscii = false; 
    String n;
    // use |lower| only for ASCII names 
    // For non-ASCII names, we don't want to invoke an expensive 
    // and unnecessary |lower|. 
    if (charactersAreAllASCII(name)) {
        isAscii = true;
        n = name.lower();
    } else
        n = name;

    NameMap::iterator iter = fontNameMap->find(n);
    if (iter == fontNameMap->end())
        return false;

    static int systemCp = ::GetACP();
    int fontCp = iter->second->codePage;

    if ((isAscii && systemCp == fontCp) || (!isAscii && systemCp != fontCp)) {
        altName = String(iter->second->name);
        return true;
    }

    return false;
}

static HFONT createFontIndirectAndGetWinName(const String& family, LOGFONT* winfont, String* winName)
{
    int len = min(static_cast<int>(family.length()), LF_FACESIZE - 1);
    memcpy(winfont->lfFaceName, family.characters(), len * sizeof(WORD));
    winfont->lfFaceName[len] = '\0';

    HFONT hfont = CreateFontIndirect(winfont);
    if (!hfont)
        return 0;

    HDC dc = GetDC(0);
    HGDIOBJ oldFont = static_cast<HFONT>(SelectObject(dc, hfont));
    WCHAR name[LF_FACESIZE];
    unsigned resultLength = GetTextFace(dc, LF_FACESIZE, name);
    if (resultLength > 0)
        resultLength--; // ignore the null terminator

    SelectObject(dc, oldFont);
    ReleaseDC(0, dc);
    *winName = String(name, resultLength);
    return hfont;
}

// This maps font family names to their repertoires of supported Unicode
// characters. Because it's family names rather than font faces we use
// as keys, there might be edge cases where one face of a font family
// has a different repertoire from another face of the same family. 
typedef HashMap<const wchar_t*, UnicodeSet*> FontCmapCache;

static bool fontContainsCharacter(const FontPlatformData* fontData,
                                  const wchar_t* family, UChar32 character)
{
    // FIXME: For non-BMP characters, GetFontUnicodeRanges is of
    // no use. We have to read directly from the cmap table of a font.
    // Return true for now.
    if (character > 0xFFFF)
        return true;

    // This cache is just leaked on shutdown.
    static FontCmapCache* fontCmapCache = 0;
    if (!fontCmapCache)
        fontCmapCache = new FontCmapCache;

    HashMap<const wchar_t*, UnicodeSet*>::iterator it = fontCmapCache->find(family);
    if (it != fontCmapCache->end()) 
        return it->second->contains(character);
    
    HFONT hfont = fontData->hfont();