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 "SkBitmap.h"
9#include "SkMipMap.h"
10#include "SkRandom.h"
11#include "Test.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->allocN32Pixels(w, h);
19    bm->eraseColor(SK_ColorWHITE);
20}
21
22DEF_TEST(MipMap, reporter) {
23    SkBitmap bm;
24    SkRandom rand;
25
26    for (int i = 0; i < 500; ++i) {
27        make_bitmap(&bm, rand);
28        SkAutoTUnref<SkMipMap> mm(SkMipMap::Build(bm));
29
30        REPORTER_ASSERT(reporter, !mm->extractLevel(SK_Scalar1, NULL));
31        REPORTER_ASSERT(reporter, !mm->extractLevel(SK_Scalar1 * 2, NULL));
32
33        SkMipMap::Level prevLevel;
34        sk_bzero(&prevLevel, sizeof(prevLevel));
35
36        SkScalar scale = SK_Scalar1;
37        for (int j = 0; j < 30; ++j) {
38            scale = scale * 2 / 3;
39
40            SkMipMap::Level level;
41            if (mm->extractLevel(scale, &level)) {
42                REPORTER_ASSERT(reporter, level.fPixels);
43                REPORTER_ASSERT(reporter, level.fWidth > 0);
44                REPORTER_ASSERT(reporter, level.fHeight > 0);
45                REPORTER_ASSERT(reporter, level.fRowBytes >= level.fWidth * 4);
46
47                if (prevLevel.fPixels) {
48                    REPORTER_ASSERT(reporter, level.fWidth <= prevLevel.fWidth);
49                    REPORTER_ASSERT(reporter, level.fHeight <= prevLevel.fHeight);
50                }
51                prevLevel = level;
52            }
53        }
54    }
55}
56