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Diffstat (limited to 'tests/MipMapTest.cpp')
-rw-r--r-- | tests/MipMapTest.cpp | 59 |
1 files changed, 59 insertions, 0 deletions
diff --git a/tests/MipMapTest.cpp b/tests/MipMapTest.cpp new file mode 100644 index 0000000000..c305532ebc --- /dev/null +++ b/tests/MipMapTest.cpp @@ -0,0 +1,59 @@ +/* + * 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 "Test.h" +#include "SkMipMap.h" +#include "SkBitmap.h" +#include "SkRandom.h" + +static void make_bitmap(SkBitmap* bm, SkRandom& rand) { + // for now, Build needs a min size of 2, otherwise it will return NULL. + // should fix that to support 1 X N, where N > 1 to return non-null. + int w = 2 + rand.nextU() % 1000; + int h = 2 + rand.nextU() % 1000; + bm->setConfig(SkBitmap::kARGB_8888_Config, w, h); + bm->allocPixels(); + bm->eraseColor(SK_ColorWHITE); +} + +static void TestMipMap(skiatest::Reporter* reporter) { + SkBitmap bm; + SkRandom rand; + + for (int i = 0; i < 500; ++i) { + make_bitmap(&bm, rand); + SkAutoTUnref<SkMipMap> mm(SkMipMap::Build(bm)); + + REPORTER_ASSERT(reporter, !mm->extractLevel(SK_Scalar1, NULL)); + REPORTER_ASSERT(reporter, !mm->extractLevel(SK_Scalar1 * 2, NULL)); + + SkMipMap::Level prevLevel; + prevLevel.fPixels = NULL; // sentinel + + SkScalar scale = SK_Scalar1; + for (int j = 0; j < 30; ++j) { + scale = scale * 2 / 3; + + SkMipMap::Level level; + if (mm->extractLevel(scale, &level)) { + REPORTER_ASSERT(reporter, level.fPixels); + REPORTER_ASSERT(reporter, level.fWidth > 0); + REPORTER_ASSERT(reporter, level.fHeight > 0); + REPORTER_ASSERT(reporter, level.fRowBytes >= level.fWidth * 4); + + if (prevLevel.fPixels) { + REPORTER_ASSERT(reporter, level.fWidth <= prevLevel.fWidth); + REPORTER_ASSERT(reporter, level.fHeight <= prevLevel.fHeight); + } + prevLevel = level; + } + } + } +} + +#include "TestClassDef.h" +DEFINE_TESTCLASS("MipMap", MipMapTestClass, TestMipMap) |