Replace uses of SkFixed for HarfBuzz conversions.

third_party/WebKit/Source/platform/fonts/shaping/HarfBuzzFace.cpp

 /*
  * Copyright (c) 2012 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:
  *
  *     * Redistributions of source code must retain the above copyright
  * notice, this list of conditions and the following disclaimer.
  *     * Redistributions in binary form must reproduce the above
@@ skipping 27 matching lines @@
 #include "SkPaint.h"
 #include "SkPath.h"
 #include "SkPoint.h"
 #include "SkRect.h"
 #include "SkTypeface.h"
 #include "platform/fonts/FontCache.h"
 #include "platform/fonts/FontPlatformData.h"
 #include "platform/fonts/SimpleFontData.h"
 #include "platform/fonts/shaping/HarfBuzzShaper.h"
 #include "wtf/HashMap.h"
+#include "wtf/MathExtras.h"
 
 namespace blink {
 
 const hb_tag_t HarfBuzzFace::vertTag = HB_TAG('v', 'e', 'r', 't');
 
 // Though we have FontCache class, which provides the cache mechanism for
 // WebKit's font objects, we also need additional caching layer for HarfBuzz
 // to reduce the memory consumption because hb_face_t should be associated with
 // underling font data (e.g. CTFontRef, FTFace).
 
@@ skipping 73 matching lines @@
     RefPtr<SimpleFontData> m_simpleFontData;
     WTF::HashMap<uint32_t, uint16_t>* m_glyphCacheForFaceCacheEntry;
     hb_face_t* m_face;
     hb_font_t* m_hbOpenTypeFont;
     unsigned m_rangeFrom;
     unsigned m_rangeTo;
 };
 
 static hb_position_t SkiaScalarToHarfBuzzPosition(SkScalar value)
 {
-    return SkScalarToFixed(value);
+    // We treat HarfBuzz hb_position_t as 16.16 fixed-point.
+    static const int kHbPosition1 = 1 << 16;
+    return clampTo<int>(value * kHbPosition1);
 }
 
 static void SkiaGetGlyphWidthAndExtents(SkPaint* paint, hb_codepoint_t codepoint, hb_position_t* width, hb_glyph_extents_t* extents)
 {
     ASSERT(codepoint <= 0xFFFF);
     paint->setTextEncoding(SkPaint::kGlyphID_TextEncoding);
 
     SkScalar skWidth;
     SkRect skBounds;
     uint16_t glyph = codepoint;
@@ skipping 204 matching lines @@
     hb_font_t* font = hb_font_create(m_face);
     hb_font_set_funcs(font, harfBuzzSkiaGetFontFuncs(), hbFontData, destroyHarfBuzzFontData);
     float size = m_platformData->size();
     int scale = SkiaScalarToHarfBuzzPosition(size);
     hb_font_set_scale(font, scale, scale);
     hb_font_make_immutable(font);
     return font;
 }
 
 } // namespace blink