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 "Test.h"
9#include "SkMipMap.h"
10#include "SkBitmap.h"
11#include "SkRandom.h"
12
13static void make_bitmap(SkBitmap* bm, SkRandom& rand) {
14    // for now, Build needs a min size of 2, otherwise it will return NULL.
15    // should fix that to support 1 X N, where N > 1 to return non-null.
16    int w = 2 + rand.nextU() % 1000;
17    int h = 2 + rand.nextU() % 1000;
18    bm->setConfig(SkBitmap::kARGB_8888_Config, w, h);
19    bm->allocPixels();
20    bm->eraseColor(SK_ColorWHITE);
21}
22
23static void TestMipMap(skiatest::Reporter* reporter) {
24    SkBitmap bm;
25    SkRandom rand;
26
27    for (int i = 0; i < 500; ++i) {
28        make_bitmap(&bm, rand);
29        SkAutoTUnref<SkMipMap> mm(SkMipMap::Build(bm));
30
31        REPORTER_ASSERT(reporter, !mm->extractLevel(SK_Scalar1, NULL));
32        REPORTER_ASSERT(reporter, !mm->extractLevel(SK_Scalar1 * 2, NULL));
33
34        SkMipMap::Level prevLevel;
35        sk_bzero(&prevLevel, sizeof(prevLevel));
36
37        SkScalar scale = SK_Scalar1;
38        for (int j = 0; j < 30; ++j) {
39            scale = scale * 2 / 3;
40
41            SkMipMap::Level level;
42            if (mm->extractLevel(scale, &level)) {
43                REPORTER_ASSERT(reporter, level.fPixels);
44                REPORTER_ASSERT(reporter, level.fWidth > 0);
45                REPORTER_ASSERT(reporter, level.fHeight > 0);
46                REPORTER_ASSERT(reporter, level.fRowBytes >= level.fWidth * 4);
47
48                if (prevLevel.fPixels) {
49                    REPORTER_ASSERT(reporter, level.fWidth <= prevLevel.fWidth);
50                    REPORTER_ASSERT(reporter, level.fHeight <= prevLevel.fHeight);
51                }
52                prevLevel = level;
53            }
54        }
55    }
56}
57
58#include "TestClassDef.h"
59DEFINE_TESTCLASS("MipMap", MipMapTestClass, TestMipMap)
60