use dynamic hash to speed up scaledimagecache

samplecode/SampleMipMap.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 "SampleCode.h"
 #include "SkView.h"
 #include "SkCanvas.h"
@@ skipping 34 matching lines @@
     MipMapView() {
         fOnce = false;
     }
 
     void init() {
         if (fOnce) {
             return;
         }
         fOnce = true;
 
-        fBitmap = createBitmap(N);
+        fBitmap = createBitmap(N*5);
 
         fWidth = N;
     }
 
 protected:
     // overrides from SkEventSink
     virtual bool onQuery(SkEvent* evt) {
         if (SampleCode::TitleQ(*evt)) {
             SampleCode::TitleR(evt, "MipMaps");
             return true;
@@ skipping 14 matching lines @@
         SkPaint paint;
 
         for (size_t i = 0; i < SK_ARRAY_COUNT(gLevel); ++i) {
             SkScalar x = 10.0f + i * 100;
             SkScalar y = 10.0f;
 
             paint.setFilterLevel(gLevel[i]);
 
             canvas->drawBitmap(fBitmap, x, y, &paint);
         }
-        this->inval(NULL);
+       // this->inval(NULL);
     }
 
 private:
     int fWidth;
 
     typedef SampleView INHERITED;
 };
 
 //////////////////////////////////////////////////////////////////////////////
 
 static SkView* MyFactory() { return new MipMapView; }
 static SkViewRegister reg(MyFactory);