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/*
* 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 "SkBitmap.h"
#include "SkMipMap.h"
#include "SkRandom.h"
#include "Test.h"
static void make_bitmap(SkBitmap* bm, int width, int height) {
bm->allocN32Pixels(width, height);
bm->eraseColor(SK_ColorWHITE);
}
DEF_TEST(MipMap, reporter) {
SkBitmap bm;
SkRandom rand;
for (int i = 0; i < 500; ++i) {
// for now, Build needs a min size of 2, otherwise it will return nullptr.
// should fix that to support 1 X N, where N > 1 to return non-null.
int width = 2 + rand.nextU() % 1000;
int height = 2 + rand.nextU() % 1000;
make_bitmap(&bm, width, height);
SkAutoTUnref<SkMipMap> mm(SkMipMap::Build(bm, nullptr));
REPORTER_ASSERT(reporter, mm->countLevels() == SkMipMap::ComputeLevelCount(width, height));
REPORTER_ASSERT(reporter, !mm->extractLevel(SkSize::Make(SK_Scalar1, SK_Scalar1),
nullptr));
REPORTER_ASSERT(reporter, !mm->extractLevel(SkSize::Make(SK_Scalar1 * 2, SK_Scalar1 * 2),
nullptr));
SkMipMap::Level prevLevel;
sk_bzero(&prevLevel, sizeof(prevLevel));
SkScalar scale = SK_Scalar1;
for (int j = 0; j < 30; ++j) {
scale = scale * 2 / 3;
SkMipMap::Level level;
if (mm->extractLevel(SkSize::Make(scale, scale), &level)) {
REPORTER_ASSERT(reporter, level.fPixmap.addr());
REPORTER_ASSERT(reporter, level.fPixmap.width() > 0);
REPORTER_ASSERT(reporter, level.fPixmap.height() > 0);
REPORTER_ASSERT(reporter, (int)level.fPixmap.rowBytes() >= level.fPixmap.width() * 4);
if (prevLevel.fPixmap.addr()) {
REPORTER_ASSERT(reporter, level.fPixmap.width() <= prevLevel.fPixmap.width());
REPORTER_ASSERT(reporter, level.fPixmap.height() <= prevLevel.fPixmap.height());
}
prevLevel = level;
}
}
}
}
static void test_mipmap_generation(int width, int height, int expectedMipLevelCount,
skiatest::Reporter* reporter) {
SkBitmap bm;
bm.allocN32Pixels(width, height);
bm.eraseColor(SK_ColorWHITE);
SkAutoTUnref<SkMipMap> mm(SkMipMap::Build(bm, nullptr));
const int mipLevelCount = mm->countLevels();
REPORTER_ASSERT(reporter, mipLevelCount == expectedMipLevelCount);
for (int i = 0; i < mipLevelCount; ++i) {
SkMipMap::Level level;
REPORTER_ASSERT(reporter, mm->getLevel(i, &level));
// Make sure the mipmaps contain valid data and that the sizes are correct
REPORTER_ASSERT(reporter, level.fPixmap.addr());
// + 1 because SkMipMap does not include the base mipmap level.
int twoToTheMipLevel = 1 << (i + 1);
int currentWidth = width / twoToTheMipLevel;
int currentHeight = height / twoToTheMipLevel;
REPORTER_ASSERT(reporter, level.fPixmap.width() == currentWidth);
REPORTER_ASSERT(reporter, level.fPixmap.height() == currentHeight);
}
}
DEF_TEST(MipMap_DirectLevelAccess, reporter) {
// create mipmap with invalid size
{
// SkMipMap current requires the dimensions be greater than 2x2
SkBitmap bm;
bm.allocN32Pixels(1, 1);
bm.eraseColor(SK_ColorWHITE);
SkAutoTUnref<SkMipMap> mm(SkMipMap::Build(bm, nullptr));
REPORTER_ASSERT(reporter, mm == nullptr);
}
// check small mipmap's count and levels
// There should be 5 mipmap levels generated:
// 16x16, 8x8, 4x4, 2x2, 1x1
test_mipmap_generation(32, 32, 5, reporter);
// check large mipmap's count and levels
// There should be 9 mipmap levels generated:
// 500x500, 250x250, 125x125, 62x62, 31x31, 15x15, 7x7, 3x3, 1x1
test_mipmap_generation(1000, 1000, 9, reporter);
}
struct LevelCountScenario {
int fWidth;
int fHeight;
int fExpectedLevelCount;
};
DEF_TEST(MipMap_ComputeLevelCount, reporter) {
const LevelCountScenario tests[] = {
// Test mipmaps with negative sizes
{-100, 100, 0},
{100, -100, 0},
{-100, -100, 0},
// Test mipmaps with 0, 1, 2 as dimensions
// (SkMipMap::Build requires a min size of 2)
//
// 0
{0, 100, 0},
{100, 0, 0},
{0, 0, 0},
// 1
{1, 100, 6},
{100, 1, 6},
{1, 1, 0},
// 2
{2, 100, 6},
{100, 2, 6},
{2, 2, 1},
// Test a handful of boundaries such as 63x63 and 64x64
{63, 63, 5},
{64, 64, 6},
{127, 127, 6},
{128, 128, 7},
{255, 255, 7},
{256, 256, 8},
// Test different dimensions, such as 256x64
{64, 129, 7},
{255, 32, 7},
{500, 1000, 9}
};
for (auto& currentTest : tests) {
int levelCount = SkMipMap::ComputeLevelCount(currentTest.fWidth, currentTest.fHeight);
REPORTER_ASSERT(reporter, currentTest.fExpectedLevelCount == levelCount);
}
}
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