SkOnce: add option to call another cleanup function once at exit.

tests/CachedDecodingPixelRefTest.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 "SkBitmap.h"
 #include "SkCanvas.h"
 #include "SkData.h"
@@ skipping 124 matching lines @@
             REPORTER_ASSERT(reporter, NULL != lazy.getPixels());
             if (NULL == lazy.getPixels()) {
                 continue;
             }
         }
         bool comparePixels = (SkImageEncoder::kPNG_Type == type);
         compare_bitmaps(reporter, original, lazy, comparePixels);
     }
 }
 
-static void purge_global_scaled_image_cache() {
-    size_t byteLimit = SkScaledImageCache::GetByteLimit();
-    SkScaledImageCache::SetByteLimit(0);
-    SkScaledImageCache::SetByteLimit(byteLimit);
-}
-
 ////////////////////////////////////////////////////////////////////////////////
 static bool install_skCachingPixelRef(SkData* encoded, SkBitmap* dst) {
     return SkCachingPixelRef::Install(
         SkDecodingImageGenerator::Create(
             encoded, SkDecodingImageGenerator::Options()), dst);
 }
 static bool install_skDiscardablePixelRef(SkData* encoded, SkBitmap* dst) {
     // Use system-default discardable memory.
     return SkInstallDiscardablePixelRef(
         SkDecodingImageGenerator::Create(
             encoded, SkDecodingImageGenerator::Options()), dst, NULL);
 }
 
 ////////////////////////////////////////////////////////////////////////////////
 /**
  *  This checks to see that a SkCachingPixelRef and a
  *  SkDiscardablePixelRef works as advertised with a
  *  SkDecodingImageGenerator.
  */
 DEF_TEST(DecodingImageGenerator, reporter) {
     test_three_encodings(reporter, install_skCachingPixelRef);
-    purge_global_scaled_image_cache();
     test_three_encodings(reporter, install_skDiscardablePixelRef);
 }
 
 class TestImageGenerator : public SkImageGenerator {
 public:
     enum TestType {
         kFailGetInfo_TestType,
         kFailGetPixels_TestType,
         kSucceedGetPixels_TestType,
         kLast_TestType = kSucceedGetPixels_TestType
@@ skipping 112 matching lines @@
 DEF_TEST(DiscardableAndCachingPixelRef, reporter) {
     test_newlockdelete(reporter);
 
     check_pixelref(TestImageGenerator::kFailGetInfo_TestType,
                    reporter, kSkCaching_PixelRefType, NULL);
     check_pixelref(TestImageGenerator::kFailGetPixels_TestType,
                    reporter, kSkCaching_PixelRefType, NULL);
     check_pixelref(TestImageGenerator::kSucceedGetPixels_TestType,
                    reporter, kSkCaching_PixelRefType, NULL);
 
-    purge_global_scaled_image_cache();
-
     check_pixelref(TestImageGenerator::kFailGetInfo_TestType,
                    reporter, kSkDiscardable_PixelRefType, NULL);
     check_pixelref(TestImageGenerator::kFailGetPixels_TestType,
                    reporter, kSkDiscardable_PixelRefType, NULL);
     check_pixelref(TestImageGenerator::kSucceedGetPixels_TestType,
                    reporter, kSkDiscardable_PixelRefType, NULL);
 
     SkAutoTUnref<SkDiscardableMemoryPool> pool(
         SkNEW_ARGS(SkDiscardableMemoryPool, (1, NULL)));
     REPORTER_ASSERT(reporter, 0 == pool->getRAMUsed());
     check_pixelref(TestImageGenerator::kFailGetPixels_TestType,
                    reporter, kSkDiscardable_PixelRefType, pool);
     REPORTER_ASSERT(reporter, 0 == pool->getRAMUsed());
     check_pixelref(TestImageGenerator::kSucceedGetPixels_TestType,
                    reporter, kSkDiscardable_PixelRefType, pool);
     REPORTER_ASSERT(reporter, 0 == pool->getRAMUsed());
 
     SkDiscardableMemoryPool* globalPool = SkGetGlobalDiscardableMemoryPool();
     // Only acts differently from NULL on a platform that has a
     // default discardable memory implementation that differs from the
     // global DM pool.
     check_pixelref(TestImageGenerator::kFailGetPixels_TestType,
                    reporter, kSkDiscardable_PixelRefType, globalPool);
     check_pixelref(TestImageGenerator::kSucceedGetPixels_TestType,
                    reporter, kSkDiscardable_PixelRefType, globalPool);
 }