add backdrop option to SaveLayerRec

src/core/SkPicturePlayback.cpp

 /*
  * Copyright 2014 Google Inc.
  *
  * Use of this source code is governed by a BSD-style license that can be
  * found in the LICENSE file.
  */
 
 #include "SkCanvas.h"
 #include "SkPatchUtils.h"
 #include "SkPictureData.h"
@@ skipping 465 matching lines @@
                 reader->readInt();
             }
             canvas->save();
             break;
         case SAVE_LAYER_SAVEFLAGS_DEPRECATED: {
             const SkRect* boundsPtr = get_rect_ptr(reader);
             const SkPaint* paint = fPictureData->getPaint(reader);
             auto flags = SkCanvas::LegacySaveFlagsToSaveLayerFlags(reader->readInt());
             canvas->saveLayer(SkCanvas::SaveLayerRec(boundsPtr, paint, flags));
         } break;
-        case SAVE_LAYER_SAVELAYERFLAGS: {
+        case SAVE_LAYER_SAVELAYERFLAGS_DEPRECATED_JAN_2016: {
             const SkRect* boundsPtr = get_rect_ptr(reader);
             const SkPaint* paint = fPictureData->getPaint(reader);
             canvas->saveLayer(SkCanvas::SaveLayerRec(boundsPtr, paint, reader->readInt()));
         } break;
+        case SAVE_LAYER_SAVELAYERREC: {
+            SkCanvas::SaveLayerRec rec(nullptr, nullptr, nullptr, 0);
+            const uint32_t flatFlags = reader->readInt();
+            if (flatFlags & SAVELAYERREC_HAS_BOUNDS) {
+                rec.fBounds = &reader->skipT<SkRect>();
+            }
+            if (flatFlags & SAVELAYERREC_HAS_PAINT) {
+                rec.fPaint = fPictureData->getPaint(reader);
+            }
+            if (flatFlags & SAVELAYERREC_HAS_BACKDROP) {
+                const SkPaint* paint = fPictureData->getPaint(reader);
+                rec.fBackdrop = paint->getImageFilter();
+            }
+            if (flatFlags & SAVELAYERREC_HAS_FLAGS) {
+                rec.fSaveLayerFlags = reader->readInt();
+            }
+            canvas->saveLayer(rec);
+        } break;
         case SCALE: {
             SkScalar sx = reader->readScalar();
             SkScalar sy = reader->readScalar();
             canvas->scale(sx, sy);
         } break;
         case SET_MATRIX: {
             SkMatrix matrix;
             reader->readMatrix(&matrix);
             matrix.postConcat(initialMatrix);
             canvas->setMatrix(matrix);
         } break;
         case SKEW: {
             SkScalar sx = reader->readScalar();
             SkScalar sy = reader->readScalar();
             canvas->skew(sx, sy);
         } break;
         case TRANSLATE: {
             SkScalar dx = reader->readScalar();
             SkScalar dy = reader->readScalar();
             canvas->translate(dx, dy);
         } break;
         default:
             SkASSERTF(false, "Unknown draw type: %d", op);
     }
 }