Make all blending up to GrOptDrawState be handled by the xp/xp factory.

include/core/SkXfermode.h

 
 /*
  * Copyright 2006 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.
  */
 
 
 #ifndef SkXfermode_DEFINED
@@ skipping 199 matching lines @@
         will install it and own a ref to it. Since the xfermode may or may not assign *xpf, the
         caller should set *xpf to NULL beforehand. XP's cannot use a background texture since they
         have no coord transforms.
      */
     virtual bool asXPFactory(GrXPFactory** xpf) const;
 
     /** Returns true if the xfermode can be expressed as an xfer processor factory (xpFactory),
         or a fragment processor. This helper calls the asCoeff(), asXPFactory(),
         and asFragmentProcessor() virtuals. If the xfermode is NULL, it is treated as kSrcOver_Mode.
         It is legal to call this with all params NULL to simply test the return value.
-        fp, xpf, src, and dst must all be NULL or all non-NULL.
+        fp and xpf must both be NULL or all non-NULL.
      */
     static bool AsFragmentProcessorOrXPFactory(SkXfermode*, GrFragmentProcessor**,
-                                               GrXPFactory**, Coeff* src, Coeff* dst);
+                                               GrXPFactory**);
 
     SK_TO_STRING_PUREVIRT()
     SK_DECLARE_FLATTENABLE_REGISTRAR_GROUP()
     SK_DEFINE_FLATTENABLE_TYPE(SkXfermode)
 
 protected:
     SkXfermode() {}
     /** The default implementation of xfer32/xfer16/xferA8 in turn call this
         method, 1 color at a time (upscaled to a SkPMColor). The default
         implmentation of this method just returns dst. If performance is
         important, your subclass should override xfer32/xfer16/xferA8 directly.
 
         This method will not be called directly by the client, so it need not
         be implemented if your subclass has overridden xfer32/xfer16/xferA8
     */
     virtual SkPMColor xferColor(SkPMColor src, SkPMColor dst) const;
 
 private:
     enum {
         kModeCount = kLastMode + 1
     };
 
     typedef SkFlattenable INHERITED;
 };
 
 #endif