Implemented transparent gradients

src/pdf/SkPDFGraphicState.h

 
 /*
  * Copyright 2010 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 SkPDFGraphicState_DEFINED
@@ skipping 35 matching lines @@
      *  other references.
      *  @param paint  The SkPaint to emulate.
      */
     static SkPDFGraphicState* GetGraphicStateForPaint(const SkPaint& paint);
 
     /** Make a graphic state that only sets the passed soft mask. The
      *  reference count of the object is incremented and it is the caller's
      *  responsibility to unreference it when done.
      *  @param sMask  The form xobject to use as a soft mask.
      *  @param invert Indicates if the alpha of the sMask should be inverted.
+     *  @param alpha  True to use alpha for the sMask, otherwise luminosity.

[vandebo (ex-Chrome), 2013/07/03 17:07:01]

Contrary to what you might see here, we prefer enums to bools for parameter
arguments. It makes things easier to read at the call site.  If you'd like to
clean up the other bool parameter in another CL, that'd be nice.

[ducky, 2013/07/03 23:32:09]

Done.

Does it make sense to turn the other bool parameter into a enum? It makes
intuitive sense as a bool, and calling code uses an inline boolean equality
test.

      */
     static SkPDFGraphicState* GetSMaskGraphicState(SkPDFFormXObject* sMask,
-                                                   bool invert);
+                                                   bool invert, bool alpha);
 
     /** Get a graphic state that only unsets the soft mask. The reference
      *  count of the object is incremented and it is the caller's responsibility
      *  to unreference it when done. This is needed to accommodate the weak
      *  reference pattern used when the returned object is new and has no
      *  other references.
      */
     static SkPDFGraphicState* GetNoSMaskGraphicState();
 
 private:
@@ skipping 24 matching lines @@
     explicit SkPDFGraphicState(const SkPaint& paint);
 
     void populateDict();
 
     static SkPDFObject* GetInvertFunction();
 
     static int Find(const SkPaint& paint);
 };
 
 #endif