Add interface to SkXfermode to return a GrEffect and blend coeffs.

src/core/SkXfermode.cpp

 
 /*
  * 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.
  */
 
 
 #include "SkXfermode.h"
@@ skipping 662 matching lines @@
 ///////////////////////////////////////////////////////////////////////////////
 
 bool SkXfermode::asCoeff(Coeff* src, Coeff* dst) const {
     return false;
 }
 
 bool SkXfermode::asMode(Mode* mode) const {
     return false;
 }
 
+bool SkXfermode::asNewEffect(GrContext*, GrEffectRef**, Coeff*, Coeff*) const {
+    return false;
+}
+
+bool SkXfermode::AsNewEffect(SkXfermode* xfermode,
+                             GrContext* context,
+                             GrEffectRef** effect,
+                             Coeff* src,
+                             Coeff* dst) {
+    if (NULL == xfermode) {

[robertphillips, 2013/03/27 18:12:09]

do we need to set 'effect' to be NULL as part of the contract?

[bsalomon, 2013/03/27 18:39:42]

Yes, will add that.

+        return ModeAsCoeff(kSrcOver_Mode, src, dst);
+    } else {
+        return xfermode->asNewEffect(context, effect, src, dst);
+    }
+}
+
 SkPMColor SkXfermode::xferColor(SkPMColor src, SkPMColor dst) const{
     // no-op. subclasses should override this
     return dst;
 }
 
 void SkXfermode::xfer32(SkPMColor* SK_RESTRICT dst,
                         const SkPMColor* SK_RESTRICT src, int count,
                         const SkAlpha* SK_RESTRICT aa) const {
     SkASSERT(dst && src && count >= 0);
 
@@ skipping 258 matching lines @@
 
         if (sc) {
             *sc = fSrcCoeff;
         }
         if (dc) {
             *dc = fDstCoeff;
         }
         return true;
     }
 
+    virtual bool asNewEffect(GrContext*, GrEffectRef**, Coeff* src, Coeff* dst) const SK_OVERRIDE {
+        return this->asCoeff(src, dst);
+    }
+
     SK_DEVELOPER_TO_STRING()
     SK_DECLARE_PUBLIC_FLATTENABLE_DESERIALIZATION_PROCS(SkProcCoeffXfermode)
 
 protected:
     SkProcCoeffXfermode(SkFlattenableReadBuffer& buffer) : INHERITED(buffer) {
         fMode = (SkXfermode::Mode)buffer.read32();
 
         const ProcCoeff& rec = gProcCoeffs[fMode];
         // these may be valid, or may be CANNOT_USE_COEFF
         fSrcCoeff = rec.fSC;
@@ skipping 519 matching lines @@
     return proc16;
 }
 
 SK_DEFINE_FLATTENABLE_REGISTRAR_GROUP_START(SkXfermode)
     SK_DEFINE_FLATTENABLE_REGISTRAR_ENTRY(SkProcCoeffXfermode)
     SK_DEFINE_FLATTENABLE_REGISTRAR_ENTRY(SkClearXfermode)
     SK_DEFINE_FLATTENABLE_REGISTRAR_ENTRY(SkSrcXfermode)
     SK_DEFINE_FLATTENABLE_REGISTRAR_ENTRY(SkDstInXfermode)
     SK_DEFINE_FLATTENABLE_REGISTRAR_ENTRY(SkDstOutXfermode)
 SK_DEFINE_FLATTENABLE_REGISTRAR_GROUP_END