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
make_bitmap(SkBitmap * bm,SkRandom & rand)13 static 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
DEF_TEST(MipMap,reporter)22 DEF_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, NULL));
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