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skia2/tests/MipMapTest.cpp
Mike Reed 186866c461 expose clear way to create default mips 
Change-Id: Id533b71d56fc44d8f86db24c5c4e9131d57479a5
Reviewed-on: https://skia-review.googlesource.com/c/skia/+/316716
Reviewed-by: Mike Reed <reed@google.com>
Commit-Queue: Mike Reed <reed@google.com>
2020-09-12 15:19:15 +00:00

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9.2 KiB
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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 "include/core/SkBitmap.h"
#include "include/utils/SkRandom.h"
#include "src/core/SkMipmap.h"
#include "tests/Test.h"
#include "tools/Resources.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) {
int width = 1 + rand.nextU() % 1000;
int height = 1 + rand.nextU() % 1000;
make_bitmap(&bm, width, height);
sk_sp<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);
sk_sp<SkMipmap> mm(SkMipmap::Build(bm, nullptr));
const int mipLevelCount = mm->countLevels();
REPORTER_ASSERT(reporter, mipLevelCount == expectedMipLevelCount);
REPORTER_ASSERT(reporter, mipLevelCount == SkMipmap::ComputeLevelCount(width, height));
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());
SkISize size = SkMipmap::ComputeLevelSize(width, height, i);
REPORTER_ASSERT(reporter, level.fPixmap.width() == size.width());
REPORTER_ASSERT(reporter, level.fPixmap.height() == size.height());
// + 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);
sk_sp<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 1)
//
// 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);
}
}
struct LevelSizeScenario {
int fBaseWidth;
int fBaseHeight;
int fLevel;
SkISize fExpectedMipMapLevelSize;
};
DEF_TEST(MipMap_ComputeLevelSize, reporter) {
const LevelSizeScenario tests[] = {
// Test mipmaps with negative sizes
{-100, 100, 0, SkISize::Make(0, 0)},
{100, -100, 0, SkISize::Make(0, 0)},
{-100, -100, 0, SkISize::Make(0, 0)},
// Test mipmaps with 0, 1, 2 as dimensions
// (SkMipmap::Build requires a min size of 1)
//
// 0
{0, 100, 0, SkISize::Make(0, 0)},
{100, 0, 0, SkISize::Make(0, 0)},
{0, 0, 0, SkISize::Make(0, 0)},
// 1
{1, 100, 0, SkISize::Make(1, 50)},
{100, 1, 0, SkISize::Make(50, 1)},
{1, 1, 0, SkISize::Make(0, 0)},
// 2
{2, 100, 0, SkISize::Make(1, 50)},
{100, 2, 1, SkISize::Make(25, 1)},
{2, 2, 0, SkISize::Make(1, 1)},
// Test a handful of cases
{63, 63, 2, SkISize::Make(7, 7)},
{64, 64, 2, SkISize::Make(8, 8)},
{127, 127, 2, SkISize::Make(15, 15)},
{64, 129, 3, SkISize::Make(4, 8)},
{255, 32, 6, SkISize::Make(1, 1)},
{500, 1000, 1, SkISize::Make(125, 250)},
};
for (auto& currentTest : tests) {
SkISize levelSize = SkMipmap::ComputeLevelSize(currentTest.fBaseWidth,
currentTest.fBaseHeight,
currentTest.fLevel);
REPORTER_ASSERT(reporter, currentTest.fExpectedMipMapLevelSize == levelSize);
}
}
DEF_TEST(MipMap_F16, reporter) {
SkBitmap bmp;
bmp.allocPixels(SkImageInfo::Make(10, 10, kRGBA_F16_SkColorType, kPremul_SkAlphaType));
bmp.eraseColor(0);
sk_sp<SkMipmap> mipmap(SkMipmap::Build(bmp, nullptr));
}
#include "include/core/SkCanvas.h"
#include "include/core/SkSurface.h"
static void fill_in_mips(SkMipmapBuilder* builder, sk_sp<SkImage> img) {
int count = builder->countLevels();
for (int i = 0; i < count; ++i) {
SkPixmap pm = builder->level(i);
auto surf = SkSurface::MakeRasterDirect(pm);
surf->getCanvas()->drawImageRect(img, SkRect::MakeIWH(pm.width(), pm.height()), nullptr);
}
}
DEF_TEST(image_mip_factory, reporter) {
// TODO: what do to about lazy images and mipmaps?
auto img = GetResourceAsImage("images/mandrill_128.png")->makeRasterImage();
REPORTER_ASSERT(reporter, !img->hasMipmaps());
auto img1 = img->withDefaultMipmaps();
REPORTER_ASSERT(reporter, img.get() != img1.get());
REPORTER_ASSERT(reporter, img1->hasMipmaps());
SkMipmapBuilder builder(img->imageInfo());
fill_in_mips(&builder, img);
auto img2 = img->withMipmaps(builder.detach());
REPORTER_ASSERT(reporter, !builder.detach());
REPORTER_ASSERT(reporter, img.get() != img2.get());
REPORTER_ASSERT(reporter, img1.get() != img2.get());
REPORTER_ASSERT(reporter, img2->hasMipmaps());
}
// Ensure we can't attach mips that don't "match" the image
//
DEF_TEST(image_mip_mismatch, reporter) {
auto check_fails = [reporter](sk_sp<SkImage> img, const SkImageInfo& info) {
SkMipmapBuilder builder(info);
fill_in_mips(&builder, img);
auto img2 = img->withMipmaps(builder.detach());
// if withMipmaps() succeeds, it returns a new image, otherwise it returns the original
REPORTER_ASSERT(reporter, img.get() == img2.get());
};
auto img = GetResourceAsImage("images/mandrill_128.png")->makeRasterImage();
// check size, colortype, and alphatype
check_fails(img, img->imageInfo().makeWH(img->width() + 2, img->height() - 3));
SkASSERT(img->imageInfo().colorType() != kRGB_565_SkColorType);
check_fails(img, img->imageInfo().makeColorType(kRGB_565_SkColorType));
SkASSERT(img->imageInfo().alphaType() != kUnpremul_SkAlphaType);
check_fails(img, img->imageInfo().makeAlphaType(kUnpremul_SkAlphaType));
}
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