Simplify flattening to just write enough to call the factory

src/core/SkPictureShader.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 "SkPictureShader.h"
 
 #include "SkBitmap.h"
 #include "SkBitmapProcShader.h"
 #include "SkCanvas.h"
 #include "SkMatrixUtils.h"
 #include "SkPicture.h"
 #include "SkReadBuffer.h"
 
 #if SK_SUPPORT_GPU
 #include "GrContext.h"
 #endif
 
 SkPictureShader::SkPictureShader(const SkPicture* picture, TileMode tmx, TileMode tmy,
                                  const SkMatrix* localMatrix)
     : INHERITED(localMatrix)
     , fPicture(SkRef(picture))
     , fTmx(tmx)
     , fTmy(tmy) { }
 
-SkPictureShader::SkPictureShader(SkReadBuffer& buffer)
-        : INHERITED(buffer) {
+#ifdef SK_SUPPORT_LEGACY_DEEPFLATTENING
+SkPictureShader::SkPictureShader(SkReadBuffer& buffer) : INHERITED(buffer) {
     fTmx = static_cast<SkShader::TileMode>(buffer.read32());
     fTmy = static_cast<SkShader::TileMode>(buffer.read32());
     fPicture = SkPicture::CreateFromBuffer(buffer);
 }
+#endif
 
 SkPictureShader::~SkPictureShader() {
     fPicture->unref();
 }
 
 SkPictureShader* SkPictureShader::Create(const SkPicture* picture, TileMode tmx, TileMode tmy,
                                          const SkMatrix* localMatrix) {
     if (!picture || 0 == picture->width() || 0 == picture->height()) {
         return NULL;
     }
     return SkNEW_ARGS(SkPictureShader, (picture, tmx, tmy, localMatrix));
 }
 
+SkFlattenable* SkPictureShader::CreateProc(SkReadBuffer& buffer) {
+    SkMatrix lm;
+    buffer.readMatrix(&lm);
+    TileMode mx = (TileMode)buffer.read32();
+    TileMode my = (TileMode)buffer.read32();
+    SkAutoTUnref<SkPicture> picture(SkPicture::CreateFromBuffer(buffer));
+    return SkPictureShader::Create(picture, mx, my, &lm);
+}
+
 void SkPictureShader::flatten(SkWriteBuffer& buffer) const {
-    this->INHERITED::flatten(buffer);
-
+    buffer.writeMatrix(this->getLocalMatrix());
     buffer.write32(fTmx);
     buffer.write32(fTmy);
     fPicture->flatten(buffer);
 }
 
 SkShader* SkPictureShader::refBitmapShader(const SkMatrix& matrix, const SkMatrix* localM) const {
     SkASSERT(fPicture && fPicture->width() > 0 && fPicture->height() > 0);
 
     SkMatrix m;
     m.setConcat(matrix, this->getLocalMatrix());
@@ skipping 135 matching lines @@
     return bitmapShader->asNewEffect(context, paint, NULL, paintColor, effect);
 }
 #else
 bool SkPictureShader::asNewEffect(GrContext* context, const SkPaint& paint,
                                   const SkMatrix* localMatrix, GrColor* paintColor,
                                   GrEffect** effect) const {
     SkDEBUGFAIL("Should not call in GPU-less build");
     return false;
 }
 #endif