Add luminance mask transfer modes.

src/pdf/SkPDFGraphicState.cpp

 /*
  * Copyright 2011 Google Inc.
  *
  * Use of this source code is governed by a BSD-style license that can be
  * found in the LICENSE file.
  */
 
 #include "SkPDFFormXObject.h"
 #include "SkPDFGraphicState.h"
 #include "SkPDFUtils.h"
@@ skipping 30 matching lines @@
         case SkXfermode::kDstIn_Mode:
         case SkXfermode::kSrcOut_Mode:
         case SkXfermode::kDstOut_Mode:
             return "Normal";
 
         // TODO(vandebo): Figure out if we can support more of these modes.
         case SkXfermode::kSrcATop_Mode:
         case SkXfermode::kDstATop_Mode:
         case SkXfermode::kXor_Mode:
         case SkXfermode::kPlus_Mode:
+        case SkXfermode::kSrcInLum_Mode:

[vandebo (ex-Chrome), 2013/08/20 17:24:47]

These can probably be supported in the current framework. If not, we should
seriously consider if they should be added to the public framework.

+        case SkXfermode::kDstInLum_Mode:
             return NULL;
     }
     return NULL;
 }
 
 SkPDFGraphicState::~SkPDFGraphicState() {
     SkAutoMutexAcquire lock(CanonicalPaintsMutex());
     if (!fSMask) {
         int index = Find(fPaint);
         SkASSERT(index >= 0);
@@ skipping 219 matching lines @@
     }
     if (bXfermodeName < 0 || bXfermodeName > SkXfermode::kLastMode ||
             blend_mode_from_xfermode(bXfermodeName) == NULL) {
         bXfermodeName = SkXfermode::kSrcOver_Mode;
     }
     const char* bXfermodeString = blend_mode_from_xfermode(bXfermodeName);
     SkASSERT(bXfermodeString != NULL);
 
     return strcmp(aXfermodeString, bXfermodeString) == 0;
 }