Initial OpenType Font Variations Support

third_party/WebKit/Source/platform/fonts/FontCacheKey.h

 /*
  * Copyright (C) 2013 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:
  *
  * 1. Redistributions of source code must retain the above copyright
  *    notice, this list of conditions and the following disclaimer.
  * 2. Redistributions in binary form must reproduce the above copyright
@@ skipping 14 matching lines @@
  * 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.
  */
 
 #ifndef FontCacheKey_h
 #define FontCacheKey_h
 
 #include "FontFaceCreationParams.h"
+#include "platform/fonts/opentype/FontSettings.h"
 #include "wtf/Allocator.h"
 #include "wtf/HashMap.h"
 #include "wtf/HashTableDeletedValueType.h"
 #include "wtf/text/AtomicStringHash.h"
 #include "wtf/text/StringHash.h"
 
 namespace blink {
 
 // Multiplying the floating point size by 100 gives two decimal point
 // precision which should be sufficient.
 static const unsigned s_fontSizePrecisionMultiplier = 100;
 
 struct FontCacheKey {
   DISALLOW_NEW_EXCEPT_PLACEMENT_NEW();
 
  public:
   FontCacheKey() : m_creationParams(), m_fontSize(0), m_options(0) {}
   FontCacheKey(FontFaceCreationParams creationParams,
                float fontSize,
-               unsigned options)
+               unsigned options,
+               PassRefPtr<FontVariationSettings> variationSettings)
       : m_creationParams(creationParams),
         m_fontSize(fontSize * s_fontSizePrecisionMultiplier),
-        m_options(options) {}
+        m_options(options),
+        m_variationSettings(variationSettings) {}
+
   FontCacheKey(WTF::HashTableDeletedValueType)
       : m_fontSize(hashTableDeletedSize()) {}
 
   unsigned hash() const {
-    unsigned hashCodes[3] = {m_creationParams.hash(), m_fontSize, m_options};
+    unsigned hashCodes[4] = {
+        m_creationParams.hash(), m_fontSize, m_options,
+        m_variationSettings ? m_variationSettings->hash() : 0};
     return StringHasher::hashMemory<sizeof(hashCodes)>(hashCodes);
   }
 
   bool operator==(const FontCacheKey& other) const {
     return m_creationParams == other.m_creationParams &&
-           m_fontSize == other.m_fontSize && m_options == other.m_options;
+           m_fontSize == other.m_fontSize && m_options == other.m_options &&
+           m_variationSettings == other.m_variationSettings;
   }
 
   bool isHashTableDeletedValue() const {
     return m_fontSize == hashTableDeletedSize();
   }
 
   static unsigned precisionMultiplier() {
     return s_fontSizePrecisionMultiplier;
   }
 
   void clearFontSize() { m_fontSize = 0; }
 
  private:
   static unsigned hashTableDeletedSize() { return 0xFFFFFFFFU; }
 
   FontFaceCreationParams m_creationParams;
   unsigned m_fontSize;
   unsigned m_options;
+  RefPtr<FontVariationSettings> m_variationSettings;
 };
 
 struct FontCacheKeyHash {
   STATIC_ONLY(FontCacheKeyHash);
   static unsigned hash(const FontCacheKey& key) { return key.hash(); }
 
   static bool equal(const FontCacheKey& a, const FontCacheKey& b) {
     return a == b;
   }
 
   static const bool safeToCompareToEmptyOrDeleted = true;
 };
 
 struct FontCacheKeyTraits : WTF::SimpleClassHashTraits<FontCacheKey> {
   STATIC_ONLY(FontCacheKeyTraits);
 };
 
 }  // namespace blink
 
 #endif  // FontCacheKey_h