Simplify flattening to just write enough to call the factory

gm/imagefiltersbase.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 "gm.h"
 #include "SkCanvas.h"
 #include "SkColorFilter.h"
@@ skipping 12 matching lines @@
     }
 
     SK_DECLARE_PUBLIC_FLATTENABLE_DESERIALIZATION_PROCS(FailImageFilter)
 protected:
     FailImageFilter() : INHERITED(0, NULL) {}
     virtual bool onFilterImage(Proxy*, const SkBitmap& src, const Context&,
                                SkBitmap* result, SkIPoint* offset) const SK_OVERRIDE {
         return false;
     }
 
-    FailImageFilter(SkReadBuffer& buffer)
-      : INHERITED(0, buffer) {}
+#ifdef SK_SUPPORT_LEGACY_DEEPFLATTENING
+    FailImageFilter(SkReadBuffer& buffer) : INHERITED(0, buffer) {}
+#endif
 
 private:
     typedef SkImageFilter INHERITED;
 };
 
+SkFlattenable* FailImageFilter::CreateProc(SkReadBuffer& buffer) {
+    SK_IMAGEFILTER_UNFLATTEN_COMMON(common, 0);
+    return FailImageFilter::Create();
+}
+
 // register the filter with the flattenable registry
 static SkFlattenable::Registrar gFailImageFilterReg("FailImageFilter",
                                                     FailImageFilter::CreateProc,
                                                     FailImageFilter::GetFlattenableType());
 
 class IdentityImageFilter : public SkImageFilter {
 public:
     static IdentityImageFilter* Create(SkImageFilter* input = NULL) {
         return SkNEW_ARGS(IdentityImageFilter, (input));
     }
 
     SK_DECLARE_PUBLIC_FLATTENABLE_DESERIALIZATION_PROCS(IdentityImageFilter)
 protected:
     IdentityImageFilter(SkImageFilter* input) : INHERITED(1, &input) {}
     virtual bool onFilterImage(Proxy*, const SkBitmap& src, const Context&,
                                SkBitmap* result, SkIPoint* offset) const SK_OVERRIDE {
         *result = src;
         offset->set(0, 0);
         return true;
     }
 
-    IdentityImageFilter(SkReadBuffer& buffer)
-      : INHERITED(1, buffer) {}
+#ifdef SK_SUPPORT_LEGACY_DEEPFLATTENING
+    IdentityImageFilter(SkReadBuffer& buffer) : INHERITED(1, buffer) {}
+#endif
 
 private:
     typedef SkImageFilter INHERITED;
 };
 
+SkFlattenable* IdentityImageFilter::CreateProc(SkReadBuffer& buffer) {
+    SK_IMAGEFILTER_UNFLATTEN_COMMON(common, 1);
+    return IdentityImageFilter::Create(common.inputAt(0));
+}
+
 // register the filter with the flattenable registry
 static SkFlattenable::Registrar gIdentityImageFilterReg("IdentityImageFilter",
                                                         IdentityImageFilter::CreateProc,
                                                         IdentityImageFilter::GetFlattenableType());
 
 
 ///////////////////////////////////////////////////////////////////////////////
 
 static void draw_paint(SkCanvas* canvas, const SkRect& r, SkImageFilter* imf) {
     SkPaint paint;
@@ skipping 149 matching lines @@
     }
 
 private:
     typedef GM INHERITED;
 };
 
 ///////////////////////////////////////////////////////////////////////////////
 
 static skiagm::GM* MyFactory(void*) { return new ImageFiltersBaseGM; }
 static skiagm::GMRegistry reg(MyFactory);