Adding Locale (language attribute) information to font and using the

Source/platform/fonts/harfbuzz/HarfBuzzShaper.cpp

 /*
  * Copyright (c) 2012 Google Inc. All rights reserved.
  * Copyright (C) 2013 BlackBerry Limited. 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.
@@ skipping 67 matching lines @@
 
 
 static const unsigned cHarfBuzzCacheMaxSize = 256;
 
 struct CachedShapingResultsLRUNode;
 struct CachedShapingResults;
 typedef std::map<std::wstring, CachedShapingResults*> CachedShapingResultsMap;
 typedef std::list<CachedShapingResultsLRUNode*> CachedShapingResultsLRU;
 
 struct CachedShapingResults {
-    CachedShapingResults(hb_buffer_t* harfBuzzBuffer, const Font* runFont, hb_direction_t runDir);
+    CachedShapingResults(hb_buffer_t* harfBuzzBuffer, const Font* runFont, hb_direction_t runDir, String newLocale);
     ~CachedShapingResults();
 
     hb_buffer_t* buffer;
     Font font;
     hb_direction_t dir;
+    String locale;
     CachedShapingResultsLRU::iterator lru;
 };
 
 struct CachedShapingResultsLRUNode {
     CachedShapingResultsLRUNode(const CachedShapingResultsMap::iterator& cacheEntry);
     ~CachedShapingResultsLRUNode();
 
     CachedShapingResultsMap::iterator entry;
 };
 
-CachedShapingResults::CachedShapingResults(hb_buffer_t* harfBuzzBuffer, const Font* fontData, hb_direction_t dirData)
+CachedShapingResults::CachedShapingResults(hb_buffer_t* harfBuzzBuffer, const Font* fontData, hb_direction_t dirData, String newLocale)
     : buffer(harfBuzzBuffer)
     , font(*fontData)
     , dir(dirData)
+    , locale(newLocale)
 {
 }
 
 CachedShapingResults::~CachedShapingResults()
 {
     hb_buffer_destroy(buffer);
 }
 
 CachedShapingResultsLRUNode::CachedShapingResultsLRUNode(const CachedShapingResultsMap::iterator& cacheEntry)
     : entry(cacheEntry)
@@ skipping 666 matching lines @@
     // a copy of the string.
     COMPILE_ASSERT(sizeof(UChar) == sizeof(uint16_t), UChar_is_the_same_size_as_uint16_t);
     return reinterpret_cast<const uint16_t*>(src);
 }
 
 bool HarfBuzzShaper::shapeHarfBuzzRuns()
 {
     HarfBuzzScopedPtr<hb_buffer_t> harfBuzzBuffer(hb_buffer_create(), hb_buffer_destroy);
 
     HarfBuzzRunCache& runCache = harfBuzzRunCache();
+    const String localeStr = m_font->fontDescription().locale();
 
     for (unsigned i = 0; i < m_harfBuzzRuns.size(); ++i) {
         unsigned runIndex = m_run.rtl() ? m_harfBuzzRuns.size() - i - 1 : i;
         HarfBuzzRun* currentRun = m_harfBuzzRuns[runIndex].get();
         const SimpleFontData* currentFontData = currentRun->fontData();
         if (currentFontData->isSVGFont())
             return false;
 
         FontPlatformData* platformData = const_cast<FontPlatformData*>(&currentFontData->platformData());
         HarfBuzzFace* face = platformData->harfBuzzFace();
         if (!face)
             return false;
-
+        hb_buffer_set_language(harfBuzzBuffer.get(), hb_language_from_string((const char*)(static_cast<const LChar *>(localeStr.characters8())), localeStr.length()));

[bashi, 2014/05/14 10:00:01]

What happens when localeStr contains invalid value? Won't that happen?

[h.joshi, 2014/05/14 10:50:47]

As by default its assigned to "en", so I feel it should not contain invalid
value.

On 2014/05/14 10:00:01, bashi1 wrote:

[bashi, 2014/05/14 11:32:27]

What happens when the lang attribute is set and it contains malformed value(e.g.
invalid surrogate pair)? I want to make sure such values are stripped at this
point.

         hb_buffer_set_script(harfBuzzBuffer.get(), currentRun->script());
         hb_buffer_set_direction(harfBuzzBuffer.get(), currentRun->rtl() ? HB_DIRECTION_RTL : HB_DIRECTION_LTR);
 
         hb_segment_properties_t props;
         hb_buffer_get_segment_properties(harfBuzzBuffer.get(), &props);
 
         const UChar* src = m_normalizedBuffer.get() + currentRun->startIndex();
         std::wstring key(src, src + currentRun->numCharacters());
 
         CachedShapingResults* cachedResults = runCache.find(key);
         if (cachedResults) {
-            if (cachedResults->dir == props.direction && cachedResults->font == *m_font) {
+            if (cachedResults->dir == props.direction && cachedResults->font == *m_font && cachedResults->locale == localeStr) {
                 currentRun->applyShapeResult(cachedResults->buffer);
                 setGlyphPositionsForHarfBuzzRun(currentRun, cachedResults->buffer);
 
                 hb_buffer_clear_contents(harfBuzzBuffer.get());
 
                 runCache.moveToBack(cachedResults);
 
                 continue;
             }
 
@@ skipping 15 matching lines @@
 
         if (m_font->fontDescription().orientation() == Vertical)
             face->setScriptForVerticalGlyphSubstitution(harfBuzzBuffer.get());
 
         HarfBuzzScopedPtr<hb_font_t> harfBuzzFont(face->createFont(), hb_font_destroy);
 
         hb_shape(harfBuzzFont.get(), harfBuzzBuffer.get(), m_features.isEmpty() ? 0 : m_features.data(), m_features.size());
         currentRun->applyShapeResult(harfBuzzBuffer.get());
         setGlyphPositionsForHarfBuzzRun(currentRun, harfBuzzBuffer.get());
 
-        runCache.insert(key, new CachedShapingResults(harfBuzzBuffer.get(), m_font, props.direction));
+        runCache.insert(key, new CachedShapingResults(harfBuzzBuffer.get(), m_font, props.direction, localeStr));
 
         harfBuzzBuffer.set(hb_buffer_create());
     }
 
     return true;
 }
 
 void HarfBuzzShaper::setGlyphPositionsForHarfBuzzRun(HarfBuzzRun* currentRun, hb_buffer_t* harfBuzzBuffer)
 {
     const SimpleFontData* currentFontData = currentRun->fontData();
@@ skipping 245 matching lines @@
     if (!foundToX)
         toX = m_run.rtl() ? 0 : m_totalWidth;
 
     // Using floorf() and roundf() as the same as mac port.
     if (fromX < toX)
         return FloatRect(floorf(point.x() + fromX), point.y(), roundf(toX - fromX), height);
     return FloatRect(floorf(point.x() + toX), point.y(), roundf(fromX - toX), height);
 }
 
 } // namespace WebCore