prototype for kerning api

src/core/SkTypeface.cpp

 /*
  * Copyright 2011 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 "SkAdvancedTypefaceMetrics.h"
 #include "SkFontDescriptor.h"
 #include "SkFontHost.h"
@@ skipping 215 matching lines @@
 
 int SkTypeface::countGlyphs() const {
     return this->onCountGlyphs();
 }
 
 int SkTypeface::getUnitsPerEm() const {
     // should we try to cache this in the base-class?
     return this->onGetUPEM();
 }
 
+bool SkTypeface::getKerningPairAdjustments(const uint16_t glyphs[], int count,
+                                           int32_t adjustments[]) const {
+    SkASSERT(count >= 0);
+    // chedk for the only legal way to pass a NULL.. everthing is 0

[bungeman-skia, 2013/10/30 15:05:57]

s/chedk/check
s/everthing/everything

+    // in which case they just want to know if this face can possibly support
+    // kerning (true) or never (false).
+    if (NULL == glyphs || NULL == adjustments) {
+        SkASSERT(NULL == glyphs);
+        SkASSERT(0 == count);
+        SkASSERT(NULL == adjustments);
+    }
+    return this->onGetKerningPairAdjustments(glyphs, count, adjustments);
+}
+
 SkTypeface::LocalizedStrings* SkTypeface::createFamilyNameIterator() const {
     return this->onCreateFamilyNameIterator();
 }
 
 void SkTypeface::getFamilyName(SkString* name) const {
     bool isLocal = false;
     SkFontDescriptor desc(this->style());
     this->onGetFontDescriptor(&desc, &isLocal);
     name->set(desc.getFamilyName());
 }
 
 SkAdvancedTypefaceMetrics* SkTypeface::getAdvancedTypefaceMetrics(
                                 SkAdvancedTypefaceMetrics::PerGlyphInfo info,
                                 const uint32_t* glyphIDs,
                                 uint32_t glyphIDsCount) const {
     return this->onGetAdvancedTypefaceMetrics(info, glyphIDs, glyphIDsCount);
 }
 
 SkTypeface* SkTypeface::refMatchingStyle(Style style) const {
     return this->onRefMatchingStyle(style);
 }
+
+///////////////////////////////////////////////////////////////////////////////
+
+bool SkTypeface::onGetKerningPairAdjustments(const uint16_t glyphs[], int count,
+                                             int32_t adjustments[]) const {
+    return false;
+}
+