tests/ImageCacheTest.cpp

   1  /*
   2  * Copyright 2013 Google Inc.
   3  *
   4  * Use of this source code is governed by a BSD-style license that can be
   5  * found in the LICENSE file.
   6  */
   7
   8 #include "SkDiscardableMemory.h"
   9 #include "SkScaledImageCache.h"
  10 #include "Test.h"
  11
  12 static void make_bm(SkBitmap* bm, int w, int h) {
  13     bm->allocN32Pixels(w, h);
  14 }
  15
  16 static const int COUNT = 10;
  17 static const int DIM = 256;
  18
  19 static void test_cache(skiatest::Reporter* reporter, SkScaledImageCache& cache,
  20                        bool testPurge) {
  21     SkScaledImageCache::ID* id;
  22
  23     SkBitmap bm[COUNT];
  24
  25     const SkScalar scale = 2;
  26     for (int i = 0; i < COUNT; ++i) {
  27         make_bm(&bm[i], DIM, DIM);
  28     }
  29
  30     for (int i = 0; i < COUNT; ++i) {
  31         SkBitmap tmp;
  32
  33         SkScaledImageCache::ID* id = cache.findAndLock(bm[i], scale, scale, &tmp);
  34         REPORTER_ASSERT(reporter, NULL == id);
  35
  36         make_bm(&tmp, DIM, DIM);
  37         id = cache.addAndLock(bm[i], scale, scale, tmp);
  38         REPORTER_ASSERT(reporter, NULL != id);
  39
  40         SkBitmap tmp2;
  41         SkScaledImageCache::ID* id2 = cache.findAndLock(bm[i], scale, scale,
  42                                                         &tmp2);
  43         REPORTER_ASSERT(reporter, id == id2);
  44         REPORTER_ASSERT(reporter, tmp.pixelRef() == tmp2.pixelRef());
  45         REPORTER_ASSERT(reporter, tmp.width() == tmp2.width());
  46         REPORTER_ASSERT(reporter, tmp.height() == tmp2.height());
  47         cache.unlock(id2);
  48
  49         cache.unlock(id);
  50     }
  51
  52     if (testPurge) {
  53         // stress test, should trigger purges
  54         float incScale = 2;
  55         for (size_t i = 0; i < COUNT * 100; ++i) {
  56             incScale += 1;
  57
  58             SkBitmap tmp;
  59             make_bm(&tmp, DIM, DIM);
  60
  61             SkScaledImageCache::ID* id = cache.addAndLock(bm[0], incScale,
  62                                                           incScale, tmp);
  63             REPORTER_ASSERT(reporter, NULL != id);
  64             cache.unlock(id);
  65         }
  66     }
  67
  68     // test the originals after all that purging
  69     for (int i = 0; i < COUNT; ++i) {
  70         SkBitmap tmp;
  71         id = cache.findAndLock(bm[i], scale, scale, &tmp);
  72         if (id) {
  73             cache.unlock(id);
  74         }
  75     }
  76
  77     cache.setByteLimit(0);
  78 }
  79
  80 #include "SkDiscardableMemoryPool.h"
  81
  82 static SkDiscardableMemoryPool* gPool;
  83 static SkDiscardableMemory* pool_factory(size_t bytes) {
  84     return gPool->create(bytes);
  85 }
  86
  87 DEF_TEST(ImageCache, reporter) {
  88     static const size_t defLimit = DIM * DIM * 4 * COUNT + 1024;    // 1K slop
  89
  90     {
  91         SkScaledImageCache cache(defLimit);
  92         test_cache(reporter, cache, true);
  93     }
  94     {
  95         SkDiscardableMemoryPool pool(defLimit);
  96         gPool = &pool;
  97         SkScaledImageCache cache(pool_factory);
  98         test_cache(reporter, cache, true);
  99     }
 100     {
 101         SkScaledImageCache cache(SkDiscardableMemory::Create);
 102         test_cache(reporter, cache, false);
 103     }
 104 }
 105
 106 DEF_TEST(ImageCache_doubleAdd, r) {
 107     // Adding the same key twice should be safe.
 108     SkScaledImageCache cache(4096);
 109
 110     SkBitmap original;
 111     original.allocN32Pixels(40, 40);
 112
 113     SkBitmap scaled1;
 114     scaled1.allocN32Pixels(20, 20);
 115
 116     SkBitmap scaled2;
 117     scaled2.allocN32Pixels(20, 20);
 118
 119     SkScaledImageCache::ID* id1 = cache.addAndLock(original, 0.5f, 0.5f, scaled1);
 120     SkScaledImageCache::ID* id2 = cache.addAndLock(original, 0.5f, 0.5f, scaled2);
 121     // We don't really care if id1 == id2 as long as unlocking both works.
 122     cache.unlock(id1);
 123     cache.unlock(id2);
 124
 125     SkBitmap tmp;
 126     // Lookup should return the value that was added last.
 127     SkScaledImageCache::ID* id = cache.findAndLock(original, 0.5f, 0.5f, &tmp);
 128     REPORTER_ASSERT(r, NULL != id);
 129     REPORTER_ASSERT(r, tmp.getGenerationID() == scaled2.getGenerationID());
 130     cache.unlock(id);
 131 }