Simplify flattening to just write enough to call the factory

src/effects/SkTileImageFilter.cpp

 /*
  * Copyright 2013 Google Inc.
  *
  * Use of this source code is governed by a BSD-style license that can be
  * found in the LICENSE file.
  */
 
 #include "SkTileImageFilter.h"
 #include "SkBitmap.h"
 #include "SkCanvas.h"
 #include "SkDevice.h"
 #include "SkReadBuffer.h"
 #include "SkWriteBuffer.h"
 #include "SkMatrix.h"
 #include "SkPaint.h"
 #include "SkShader.h"
 #include "SkValidationUtils.h"
 
+SkTileImageFilter* SkTileImageFilter::Create(const SkRect& srcRect, const SkRect& dstRect,
+                                             SkImageFilter* input) {
+    if (!SkIsValidRect(srcRect) || !SkIsValidRect(dstRect)) {
+        return NULL;
+    }
+    return SkNEW_ARGS(SkTileImageFilter, (srcRect, dstRect, input));
+}
+
 bool SkTileImageFilter::onFilterImage(Proxy* proxy, const SkBitmap& src,
                                       const Context& ctx,
                                       SkBitmap* dst, SkIPoint* offset) const {
     SkBitmap source = src;
     SkImageFilter* input = getInput(0);
     SkIPoint srcOffset = SkIPoint::Make(0, 0);
     if (input && !input->filterImage(proxy, src, ctx, &source, &srcOffset)) {
         return false;
     }
 
@@ skipping 50 matching lines @@
                                        SkIRect* dst) const {
     SkRect srcRect;
     ctm.mapRect(&srcRect, fSrcRect);
     SkIRect srcIRect;
     srcRect.roundOut(&srcIRect);
     srcIRect.join(src);
     *dst = srcIRect;
     return true;
 }
 
+#ifdef SK_SUPPORT_LEGACY_DEEPFLATTENING
 SkTileImageFilter::SkTileImageFilter(SkReadBuffer& buffer)
   : INHERITED(1, buffer) {
     buffer.readRect(&fSrcRect);
     buffer.readRect(&fDstRect);
     buffer.validate(buffer.isValid() && SkIsValidRect(fSrcRect) && SkIsValidRect(fDstRect));
 }
+#endif
+
+SkFlattenable* SkTileImageFilter::CreateProc(SkReadBuffer& buffer) {
+    SK_IMAGEFILTER_UNFLATTEN_COMMON(common, 1);
+    SkRect src, dst;
+    buffer.readRect(&src);
+    buffer.readRect(&dst);
+    return Create(src, dst, common.getInput(0));
+}
 
 void SkTileImageFilter::flatten(SkWriteBuffer& buffer) const {
     this->INHERITED::flatten(buffer);
     buffer.writeRect(fSrcRect);
     buffer.writeRect(fDstRect);
 }