Add new entry point that supports fallback font selection based on language.

src/ports/SkFontConfigInterface_android.cpp

 
 /*
  * Copyright 2013 The Android Open Source Project
  *
  * Use of this source code is governed by a BSD-style license that can be
  * found in the LICENSE file.
  */
 
 #include "SkFontConfigInterface.h"
 #include "SkTypeface_android.h"
@@ skipping 77 matching lines @@
     // new APIs
     virtual SkDataTable* getFamilyNames() SK_OVERRIDE;
     virtual bool matchFamilySet(const char inFamilyName[],
                                 SkString* outFamilyName,
                                 SkTArray<FontIdentity>*) SK_OVERRIDE;
 
     /**
      *  Get the family name of the font in the default fallback font list that
      *  contains the specified chararacter. if no font is found, returns false.
      */
-    bool getFallbackFamilyNameForChar(SkUnichar uni, SkString* name);
+    bool getFallbackFamilyNameForChar(SkUnichar uni, const char* lang, SkString* name);
     /**
      *
      */
     SkTypeface* getTypefaceForChar(SkUnichar uni, SkTypeface::Style style,
                                    SkPaintOptionsAndroid::FontVariant fontVariant);
     SkTypeface* nextLogicalTypeface(SkFontID currFontID, SkFontID origFontID,
                                     const SkPaintOptionsAndroid& options);
 
 private:
     void addFallbackFamily(FamilyRecID fontRecID);
@@ skipping 130 matching lines @@
                 fontRec.fIsValid = find_name_and_attributes(stream.get(), &name,
                                                             &fontRec.fStyle, &isFixedWidth);
             } else {
                 if (!family->fIsFallbackFont) {
                     SkDebugf("---- failed to open <%s> as a font\n", filename.c_str());
                 }
             }
 
             if (fontRec.fIsValid) {
                 DEBUG_FONT(("---- SystemFonts[%d][%d] fallback=%d file=%s",
-                           i, fFonts.count() - 1, fontRec.fIsFallbackFont, filename.c_str()));
+                           i, fFonts.count() - 1, family->fIsFallbackFont, filename.c_str()));
             } else {
                 DEBUG_FONT(("---- SystemFonts[%d][%d] fallback=%d file=%s (INVALID)",
-                           i, fFonts.count() - 1, fontRec.fIsFallbackFont, filename.c_str()));
+                           i, fFonts.count() - 1, family->fIsFallbackFont, filename.c_str()));
                 continue;
             }
 
             // create a familyRec now that we know that at least one font in
             // the family is valid
             if (familyRec == NULL) {
                 familyRec = &fFontFamilies.push_back();
                 familyRecID = fFontFamilies.count() - 1;
                 fontRec.fFamilyRecID = familyRecID;
 
@@ skipping 234 matching lines @@
             face = SkTypeface::CreateFromName(familyName, fontRec.fStyle);
         }
 
         // store the result for subsequent lookups
         fontRec.fTypeface = face;
     }
     SkASSERT(face);
     return face;
 }
 
-bool SkFontConfigInterfaceAndroid::getFallbackFamilyNameForChar(SkUnichar uni, SkString* name) {
-    FallbackFontList* fallbackFontList = this->getCurrentLocaleFallbackFontList();
+bool SkFontConfigInterfaceAndroid::getFallbackFamilyNameForChar(SkUnichar uni,
+                                                                const char* lang,
+                                                                SkString* name) {
+    FallbackFontList* fallbackFontList = this->findFallbackFontList(lang);
     for (int i = 0; i < fallbackFontList->count(); i++) {
         FamilyRecID familyRecID = fallbackFontList->getAt(i);
+
+        // if it is not one of the accepted variants then move to the next family
+        int32_t acceptedVariants = SkPaintOptionsAndroid::kDefault_Variant |
+                                   SkPaintOptionsAndroid::kElegant_Variant;
+        if (!(fFontFamilies[familyRecID].fPaintOptions.getFontVariant() & acceptedVariants)) {
+            continue;
+        }
+
         FontRecID fontRecID = find_best_style(fFontFamilies[familyRecID], SkTypeface::kNormal);
         SkTypeface* face = this->getTypefaceForFontRec(fontRecID);
 
         SkPaint paint;
         paint.setTypeface(face);
         paint.setTextEncoding(SkPaint::kUTF32_TextEncoding);
 
         uint16_t glyphID;
         paint.textToGlyphs(&uni, sizeof(uni), &glyphID);
         if (glyphID != 0) {
@@ skipping 134 matching lines @@
                 "lang=%s, variant=%d, nextFallbackIndex[%d,%d] => nextLogicalTypeface=%d",
                 currFontID, origFontID, currFontRecID, opts.getLanguage().getTag().c_str(),
                 variant, nextFallbackFontIndex, currentFallbackList->getAt(nextFallbackFontIndex),
                 (nextLogicalTypeface) ? nextLogicalTypeface->uniqueID() : 0));
     return SkSafeRef(nextLogicalTypeface);
 }
 
 ///////////////////////////////////////////////////////////////////////////////
 
 bool SkGetFallbackFamilyNameForChar(SkUnichar uni, SkString* name) {
+    SkString locale = SkFontConfigParser::GetLocale();
     SkFontConfigInterfaceAndroid* fontConfig = getSingletonInterface();
-    return fontConfig->getFallbackFamilyNameForChar(uni, name);
+    return fontConfig->getFallbackFamilyNameForChar(uni, locale.c_str(), name);
+}
+
+bool SkGetFallbackFamilyNameForChar(SkUnichar uni, const char* lang, SkString* name) {
+    SkFontConfigInterfaceAndroid* fontConfig = getSingletonInterface();
+    return fontConfig->getFallbackFamilyNameForChar(uni, lang, name);
 }
 
 void SkUseTestFontConfigFile(const char* mainconf, const char* fallbackconf,
                              const char* fontsdir) {
     gTestMainConfigFile = mainconf;
     gTestFallbackConfigFile = fallbackconf;
     gTestFontFilePrefix = fontsdir;
     SkASSERT(gTestMainConfigFile);
     SkASSERT(gTestFallbackConfigFile);
     SkASSERT(gTestFontFilePrefix);
@@ skipping 157 matching lines @@
     return SkCreateTypefaceForScriptNG(getHBScriptFromHBScriptOld(script), style, fontVariant);
 }
 
 #endif
 
 ///////////////////////////////////////////////////////////////////////////////
 
 SkFontMgr* SkFontMgr::Factory() {
     return NULL;
 }