use globals to register custom effects

gm/imagefiltersgraph.cpp

 /*
  * Copyright 2012 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 "SkArithmeticMode.h"
 #include "SkDevice.h"
 #include "SkBitmapSource.h"
 #include "SkBlurImageFilter.h"
 #include "SkColorFilter.h"
 #include "SkColorFilterImageFilter.h"
 #include "SkColorMatrixFilter.h"
 #include "SkReadBuffer.h"
 #include "SkWriteBuffer.h"
 #include "SkMergeImageFilter.h"
 #include "SkMorphologyImageFilter.h"
 #include "SkTestImageFilters.h"
 #include "SkXfermodeImageFilter.h"
 
 // More closely models how Blink's OffsetFilter works as of 10/23/13. SkOffsetImageFilter doesn't
 // perform a draw and this one does.
 class SimpleOffsetFilter : public SkImageFilter {
 public:
+    class Registrar {
+    public:
+        Registrar() {
+            SkFlattenable::Register("SimpleOffsetFilter",
+#ifdef SK_SUPPORT_LEGACY_DEEPFLATTENING
+                                    SimpleOffsetFilter::DeepCreateProc,
+#else
+                                    SimpleOffsetFilter::CreateProc,
+#endif
+                                    SimpleOffsetFilter::GetFlattenableType());
+        }
+    };
     static SkImageFilter* Create(SkScalar dx, SkScalar dy, SkImageFilter* input) {
         return SkNEW_ARGS(SimpleOffsetFilter, (dx, dy, input));
     }
 
     virtual bool onFilterImage(Proxy* proxy, const SkBitmap& src, const Context& ctx,
                                SkBitmap* dst, SkIPoint* offset) const SK_OVERRIDE {
         SkBitmap source = src;
         SkImageFilter* input = getInput(0);
         SkIPoint srcOffset = SkIPoint::Make(0, 0);
         if (NULL != input && !input->filterImage(proxy, src, ctx, &source, &srcOffset)) {
@@ skipping 28 matching lines @@
 #endif
 
     virtual void flatten(SkWriteBuffer& buffer) const SK_OVERRIDE {
         this->INHERITED::flatten(buffer);
         buffer.writeScalar(fDX);
         buffer.writeScalar(fDY);
     }
 
 private:
     SimpleOffsetFilter(SkScalar dx, SkScalar dy, SkImageFilter* input)
-    : SkImageFilter(1, &input), fDX(dx), fDY(dy) {
-        static bool gOnce;
-        if (!gOnce) {
-            gOnce = true;
-            SkFlattenable::Register("SimpleOffsetFilter", this->getFactory(),
-                                    this->GetFlattenableType());
-        }
-    }
+        : SkImageFilter(1, &input), fDX(dx), fDY(dy) {}
 
     SkScalar fDX, fDY;
 
     typedef SkImageFilter INHERITED;
 };
 
+static SimpleOffsetFilter::Registrar gReg;
+
 SkFlattenable* SimpleOffsetFilter::CreateProc(SkReadBuffer& buffer) {
     SK_IMAGEFILTER_UNFLATTEN_COMMON(common, 1);
     SkScalar dx = buffer.readScalar();
     SkScalar dy = buffer.readScalar();
     return Create(dx, dy, common.getInput(0));
 }
 
 class ImageFiltersGraphGM : public skiagm::GM {
 public:
     ImageFiltersGraphGM() {}
@@ skipping 124 matching lines @@
 
 private:
     typedef GM INHERITED;
     SkBitmap fBitmap;
 };
 
 ///////////////////////////////////////////////////////////////////////////////
 
 static skiagm::GM* MyFactory(void*) { return new ImageFiltersGraphGM; }
 static skiagm::GMRegistry reg(MyFactory);