Introduce typeface cache in blink::FontCache

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

 /* Copyright (c) 2010, 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
  * copyright notice, this list of conditions and the following disclaimer
@@ skipping 14 matching lines @@
  * 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 FontRenderStyle_h
 #define FontRenderStyle_h
 
 #include "wtf/Allocator.h"
 
+#include "platform/PlatformExport.h"
+#include "SkTypeface.h"
+#include "SkPaint.h"
+
+namespace WTF {
+class String;
+}
+
 namespace blink {
 
 // FontRenderStyle describes the user's preferences for rendering a font at a
 // given size.
-struct FontRenderStyle {
+struct PLATFORM_EXPORT FontRenderStyle {
     DISALLOW_NEW();
     enum {
         NoPreference = 2,
     };
 
     FontRenderStyle()
         : useBitmaps(0)
         , useAutoHint(0)
         , useHinting(0)
         , hintStyle(0)
         , useAntiAlias(0)
         , useSubpixelRendering(0)
         , useSubpixelPositioning(0) { }
 
     bool operator==(const FontRenderStyle& a) const
     {
         return useBitmaps == a.useBitmaps
             && useAutoHint == a.useAutoHint
             && useHinting == a.useHinting
             && hintStyle == a.hintStyle
             && useAntiAlias == a.useAntiAlias
             && useSubpixelRendering == a.useSubpixelRendering
             && useSubpixelPositioning == a.useSubpixelPositioning;
     }
 
+    static void setHinting(SkPaint::Hinting);
+    static void setAutoHint(bool);
+    static void setUseBitmaps(bool);
+    static void setAntiAlias(bool);
+    static void setSubpixelRendering(bool);
+
+    void apply(SkPaint*, float deviceScaleFactor = 1.0) const;
+    void querySystemForRenderStyle(WTF::String family, float textSize, SkTypeface::Style);
+
     // Each of the use* members below can take one of three values:
     //   0: off
     //   1: on
     //   NoPreference: no preference expressed
     char useBitmaps; // use embedded bitmap strike if possible
     char useAutoHint; // use 'auto' hinting (FreeType specific)
     char useHinting; // hint glyphs to the pixel grid
     char hintStyle; // level of hinting, 0..3
     char useAntiAlias; // antialias glyph shapes
     char useSubpixelRendering; // use subpixel rendering (partially-filled pixels)
     char useSubpixelPositioning; // use subpixel positioning (fractional X positions for glyphs)
 };
 
 } // namespace blink
 
 #endif // FontRenderStyle_h