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 10 matching lines @@
     SkPaint objects roughly correspond to graphic state dictionaries that can
     be installed. So that a given dictionary is only output to the pdf file
     once, we want to canonicalize them. Static methods in this class manage
     a weakly referenced set of SkPDFGraphicState objects: when the last
     reference to a SkPDFGraphicState is removed, it removes itself from the
     static set of objects.
 
 */
 class SkPDFGraphicState : public SkPDFDict {
 public:
+    enum SkPDFSMaskMode {
+        kAlpha_SMaskMode,
+        kLuminosity_SMaskMode
+    };
+
     virtual ~SkPDFGraphicState();
 
     virtual void getResources(const SkTSet<SkPDFObject*>& knownResourceObjects,
                               SkTSet<SkPDFObject*>* newResourceObjects);
 
     // Override emitObject and getOutputSize so that we can populate
     // the dictionary on demand.
     virtual void emitObject(SkWStream* stream, SkPDFCatalog* catalog,
                             bool indirect);
     virtual size_t getOutputSize(SkPDFCatalog* catalog, bool indirect);
 
     /** Get the graphic state for the passed SkPaint. 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.
      *  @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 sMask     The form xobject to use as a soft mask.
+     *  @param invert    Indicates if the alpha of the sMask should be inverted.
+     *  @param sMaskMode Whether to use alpha or luminosity for the sMask.
      */
     static SkPDFGraphicState* GetSMaskGraphicState(SkPDFFormXObject* sMask,
-                                                   bool invert);
+                                                   bool invert,
+                                                   SkPDFSMaskMode sMaskMode);
 
     /** 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