Debase our Uniscribe code. This moves FontUtils and all our Uniscribe code fr...

base/gfx/font_utils.cc

Index: base/gfx/font_utils.cc
===================================================================
--- base/gfx/font_utils.cc	(revision 5555)
+++ base/gfx/font_utils.cc	(working copy)
@@ -1,336 +0,0 @@
-// Copyright (c) 2006-2008 The Chromium Authors. All rights reserved.
-// Use of this source code is governed by a BSD-style license that can be
-// found in the LICENSE file.
-
-#include "base/gfx/font_utils.h"
-
-#include <limits>
-#include <map>
-
-#include "base/gfx/uniscribe.h"
-#include "base/logging.h"
-#include "base/singleton.h"
-#include "base/string_util.h"
-#include "unicode/locid.h"
-#include "unicode/uchar.h"
-
-namespace gfx {
-
-namespace {
-
-// hash_map has extra cost with no sizable gain for a small number of integer
-// key items. When the map size becomes much bigger (which will be later as
-// more scripts are added) and this turns out to be prominent in the profile, we
-// may consider switching to hash_map (or just an array if we support all the
-// scripts)
-typedef std::map<UScriptCode, const wchar_t*> ScriptToFontMap;
-
-struct ScriptToFontMapSingletonTraits
-    : public DefaultSingletonTraits<ScriptToFontMap> {
-  static ScriptToFontMap* New() {
-    struct FontMap {
-      UScriptCode script;
-      const wchar_t* family;
-    };
-
-    const static FontMap font_map[] = {
-      {USCRIPT_LATIN, L"times new roman"},
-      {USCRIPT_GREEK, L"times new roman"},
-      {USCRIPT_CYRILLIC, L"times new roman"},
-      {USCRIPT_SIMPLIFIED_HAN, L"simsun"},
-      //{USCRIPT_TRADITIONAL_HAN, L"pmingliu"},
-      {USCRIPT_HIRAGANA, L"ms pgothic"},
-      {USCRIPT_KATAKANA, L"ms pgothic"},
-      {USCRIPT_KATAKANA_OR_HIRAGANA, L"ms pgothic"},
-      {USCRIPT_HANGUL, L"gulim"},
-      {USCRIPT_THAI, L"tahoma"},
-      {USCRIPT_HEBREW, L"david"},
-      {USCRIPT_ARABIC, L"tahoma"},
-      {USCRIPT_DEVANAGARI, L"mangal"},
-      {USCRIPT_BENGALI, L"vrinda"},
-      {USCRIPT_GURMUKHI, L"raavi"},
-      {USCRIPT_GUJARATI, L"shruti"},
-      {USCRIPT_ORIYA, L"kalinga"},
-      {USCRIPT_TAMIL, L"latha"},
-      {USCRIPT_TELUGU, L"gautami"},
-      {USCRIPT_KANNADA, L"tunga"},
-      {USCRIPT_MALAYALAM, L"kartika"},
-      {USCRIPT_LAO, L"dokchampa"},
-      {USCRIPT_TIBETAN, L"microsoft himalaya"},
-      {USCRIPT_GEORGIAN, L"sylfaen"},
-      {USCRIPT_ARMENIAN, L"sylfaen"},
-      {USCRIPT_ETHIOPIC, L"nyala"},
-      {USCRIPT_CANADIAN_ABORIGINAL, L"euphemia"},
-      {USCRIPT_CHEROKEE, L"plantagenet cherokee"},
-      {USCRIPT_YI, L"microsoft yi balti"},
-      {USCRIPT_SINHALA, L"iskoola pota"},
-      {USCRIPT_SYRIAC, L"estrangelo edessa"},
-      {USCRIPT_KHMER, L"daunpenh"},
-      {USCRIPT_THAANA, L"mv boli"},
-      {USCRIPT_MONGOLIAN, L"mongolian balti"},
-      {USCRIPT_MYANMAR, L"padauk"},
-      // For USCRIPT_COMMON, we map blocks to scripts when
-      // that makes sense.
-    };
-
-    ScriptToFontMap* new_instance = new ScriptToFontMap;
-    // Cannot recover from OOM so that there's no need to check.
-    for (int i = 0; i < arraysize(font_map); ++i)
-      (*new_instance)[font_map[i].script] = font_map[i].family;
-
-    // Initialize the locale-dependent mapping.
-    // Since Chrome synchronizes the ICU default locale with its UI locale,
-    // this ICU locale tells the current UI locale of Chrome.
-    Locale locale = Locale::getDefault();
-    ScriptToFontMap::const_iterator iter;
-    if (locale == Locale::getJapanese()) {
-      iter = new_instance->find(USCRIPT_HIRAGANA);
-    } else if (locale == Locale::getKorean()) {
-      iter = new_instance->find(USCRIPT_HANGUL);
-    } else {
-      // Use Simplified Chinese font for all other locales including
-      // Traditional Chinese because Simsun (SC font) has a wider
-      // coverage (covering both SC and TC) than PMingLiu (TC font).
-      // This also speeds up the TC version of Chrome when rendering SC pages.
-      iter = new_instance->find(USCRIPT_SIMPLIFIED_HAN);
-    }
-    if (iter != new_instance->end())
-      (*new_instance)[USCRIPT_HAN] = iter->second;
-
-    return new_instance;
-  }
-};
-
-Singleton<ScriptToFontMap, ScriptToFontMapSingletonTraits> script_font_map;
-
-const int kUndefinedAscent = std::numeric_limits<int>::min();
-
-// Given an HFONT, return the ascent. If GetTextMetrics fails,
-// kUndefinedAscent is returned, instead.
-int GetAscent(HFONT hfont) {
-  HDC dc = GetDC(NULL);
-  HGDIOBJ oldFont = SelectObject(dc, hfont);
-  TEXTMETRIC tm;
-  BOOL got_metrics = GetTextMetrics(dc, &tm);
-  SelectObject(dc, oldFont);
-  ReleaseDC(NULL, dc);
-  return got_metrics ? tm.tmAscent : kUndefinedAscent;
-}
-
-struct FontData {
-  FontData() : hfont(NULL), ascent(kUndefinedAscent), script_cache(NULL) {}
-  HFONT hfont;
-  int ascent;
-  mutable SCRIPT_CACHE script_cache;
-};
-
-// Again, using hash_map does not earn us much here.
-// page_cycler_test intl2 gave us a 'better' result with map than with hash_map
-// even though they're well-within 1-sigma of each other so that the difference
-// is not significant. On the other hand, some pages in intl2 seem to
-// take longer to load with map in the 1st pass. Need to experiment further.
-typedef std::map<std::wstring, FontData*> FontDataCache;
-struct FontDataCacheSingletonTraits
-    : public DefaultSingletonTraits<FontDataCache> {
-  static void Delete(FontDataCache* cache) {
-    FontDataCache::iterator iter = cache->begin();
-    while (iter != cache->end()) {
-      SCRIPT_CACHE script_cache = iter->second->script_cache;
-      if (script_cache)
-        ScriptFreeCache(&script_cache);
-      delete iter->second;
-      ++iter;
-    }
-    delete cache;
-  }
-};
-
-}  // namespace
-
-// TODO(jungshik) : this is font fallback code version 0.1
-//  - Cover all the scripts
-//  - Get the default font for each script/generic family from the
-//    preference instead of hardcoding in the source.
-//    (at least, read values from the registry for IE font settings).
-//  - Support generic families (from FontDescription)
-//  - If the default font for a script is not available,
-//    try some more fonts known to support it. Finally, we can
-//    use EnumFontFamilies or similar APIs to come up with a list of
-//    fonts supporting the script and cache the result.
-//  - Consider using UnicodeSet (or UnicodeMap) converted from
-//    GLYPHSET (BMP) or directly read from truetype cmap tables to
-//    keep track of which character is supported by which font
-//  - Update script_font_cache in response to WM_FONTCHANGE
-
-const wchar_t* GetFontFamilyForScript(UScriptCode script,
-                                      GenericFamilyType generic) {
-  ScriptToFontMap::const_iterator iter = script_font_map->find(script);
-  const wchar_t* family = NULL;
-  if (iter != script_font_map->end()) {
-    family = iter->second;
-  }
-  return family;
-}
-
-// TODO(jungshik)
-//  - Handle 'Inherited', 'Common' and 'Unknown'
-//    (see http://www.unicode.org/reports/tr24/#Usage_Model )
-//    For 'Inherited' and 'Common', perhaps we need to
-//    accept another parameter indicating the previous family
-//    and just return it.
-//  - All the characters (or characters up to the point a single
-//    font can cover) need to be taken into account
-const wchar_t* GetFallbackFamily(const wchar_t *characters,
-                                 int length,
-                                 GenericFamilyType generic,
-                                 UChar32 *char_checked,
-                                 UScriptCode *script_checked) {
-  DCHECK(characters && characters[0] && length > 0);
-  UScriptCode script = USCRIPT_COMMON;
-
-  // Sometimes characters common to script (e.g. space) is at
-  // the beginning of a string so that we need to skip them
-  // to get a font required to render the string.
-  int i = 0;
-  UChar32 ucs4 = 0;
-  while (i < length && script == USCRIPT_COMMON ||
-         script == USCRIPT_INVALID_CODE) {
-    U16_NEXT(characters, i, length, ucs4);
-    UErrorCode err = U_ZERO_ERROR;
-    script = uscript_getScript(ucs4, &err);
-    // silently ignore the error
-  }
-
-  // hack for full width ASCII. For the full-width ASCII, use the font
-  // for Han (which is locale-dependent). 
-  if (0xFF00 < ucs4 && ucs4 < 0xFF5F)
-    script = USCRIPT_HAN; 
-
-  // There are a lot of characters in USCRIPT_COMMON that can be covered
-  // by fonts for scripts closely related to them.
-  // See http://unicode.org/cldr/utility/list-unicodeset.jsp?a=[:Script=Common:]
-  // TODO(jungshik): make this more efficient with a wider coverage
-  if (script == USCRIPT_COMMON || script == USCRIPT_INHERITED) { 
-    UBlockCode block = ublock_getCode(ucs4);
-    switch (block) {
-      case UBLOCK_BASIC_LATIN:
-        script = USCRIPT_LATIN;
-        break;
-      case UBLOCK_CJK_SYMBOLS_AND_PUNCTUATION: 
-        script = USCRIPT_HAN;
-        break;
-      case UBLOCK_HIRAGANA:
-      case UBLOCK_KATAKANA:
-        script = USCRIPT_HIRAGANA;
-        break;
-      case UBLOCK_ARABIC:
-        script = USCRIPT_ARABIC;
-        break;
-      case UBLOCK_GREEK:
-        script = USCRIPT_GREEK;
-        break;
-      case UBLOCK_DEVANAGARI:
-        // For Danda and Double Danda (U+0964, U+0965), use a Devanagari
-        // font for now although they're used by other scripts as well.
-        // Without a context, we can't do any better. 
-        script = USCRIPT_DEVANAGARI;
-        break;
-      case UBLOCK_ARMENIAN:
-        script = USCRIPT_ARMENIAN;
-        break;
-      case UBLOCK_GEORGIAN:
-        script = USCRIPT_GEORGIAN;
-        break;
-      case UBLOCK_KANNADA:
-        script = USCRIPT_KANNADA;
-        break;
-    }
-  }
-
-  // Another lame work-around to cover non-BMP characters.
-  const wchar_t* family = GetFontFamilyForScript(script, generic);
-  if (!family) {
-    int plane = ucs4 >> 16;
-    switch (plane) {
-      case 1:
-        family = L"code2001";
-        break;
-      case 2:
-        family = L"simsun-extb";
-        break;
-      default:
-        family = L"lucida sans unicode";
-    }
-  }
-
-  if (char_checked) *char_checked = ucs4;
-  if (script_checked) *script_checked = script;
-  return family;
-}
-
-
-
-// Be aware that this is not thread-safe.
-bool GetDerivedFontData(const wchar_t *family,
-                        int style,
-                        LOGFONT *logfont,
-                        int *ascent,
-                        HFONT *hfont,
-                        SCRIPT_CACHE **script_cache) {
-  DCHECK(logfont && family && *family);
-  // Using |Singleton| here is not free, but the intl2 page cycler test
-  // does not show any noticeable difference with and without it. Leaking
-  // the contents of FontDataCache (especially SCRIPT_CACHE) at the end
-  // of a renderer process may not be a good idea. We may use
-  // atexit(). However, with no noticeable performance difference, |Singleton|
-  // is cleaner, I believe.
-  FontDataCache* font_data_cache =
-      Singleton<FontDataCache, FontDataCacheSingletonTraits>::get();
-  // TODO(jungshik) : This comes up pretty high in the profile so that
-  // we need to measure whether using SHA256 (after coercing all the
-  // fields to char*) is faster than StringPrintf.
-  std::wstring font_key = StringPrintf(L"%1d:%d:%ls", style, logfont->lfHeight,
-                                       family);
-  FontDataCache::const_iterator iter = font_data_cache->find(font_key);
-  FontData *derived;
-  if (iter == font_data_cache->end()) {
-    DCHECK(wcslen(family) < LF_FACESIZE);
-    wcscpy_s(logfont->lfFaceName, LF_FACESIZE, family);
-    // TODO(jungshik): CreateFontIndirect always comes up with
-    // a font even if there's no font matching the name. Need to
-    // check it against what we actually want (as is done in FontCacheWin.cpp)
-    derived = new FontData;
-    derived->hfont = CreateFontIndirect(logfont);
-    // GetAscent may return kUndefinedAscent, but we still want to
-    // cache it so that we won't have to call CreateFontIndirect once
-    // more for HFONT next time.
-    derived->ascent = GetAscent(derived->hfont);
-    (*font_data_cache)[font_key] = derived;
-  } else {
-    derived = iter->second;
-    // Last time, GetAscent failed so that only HFONT was
-    // cached. Try once more assuming that TryPreloadFont
-    // was called by a caller between calls.
-    if (kUndefinedAscent == derived->ascent)
-      derived->ascent = GetAscent(derived->hfont);
-  }
-  *hfont = derived->hfont;
-  *ascent = derived->ascent;
-  *script_cache = &(derived->script_cache);
-  return *ascent != kUndefinedAscent;
-}
-
-int GetStyleFromLogfont(const LOGFONT* logfont) {
-  // TODO(jungshik) : consider defining UNDEFINED or INVALID for style and
-  //                  returning it when logfont is NULL
-  if (!logfont) {
-    NOTREACHED();
-    return FONT_STYLE_NORMAL;
-  }
-  return (logfont->lfItalic ? FONT_STYLE_ITALIC : FONT_STYLE_NORMAL) |
-         (logfont->lfUnderline ? FONT_STYLE_UNDERLINED : FONT_STYLE_NORMAL) |
-         (logfont->lfWeight >= 700 ? FONT_STYLE_BOLD : FONT_STYLE_NORMAL);
-}
-
-}  // namespace gfx
-