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skia2/tests/MipMapTest.cpp
Mike Reed 15292955fe test for valid mips before setting on image 
We seed the builder with the imageinfo of an image, but after it is
built we then have to "attach" it to an image (or more than one).

Check that the mip chain is compatible with the parent image we are
attaching to.


Change-Id: Iead6aee54861fdd4910f38f89a0364ed80c341d8
Reviewed-on: https://skia-review.googlesource.com/c/skia/+/305680
Commit-Queue: Mike Reed <reed@google.com>
Reviewed-by: Robert Phillips <robertphillips@google.com>
2020-07-25 17:27:03 +00:00

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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->withMipmaps(nullptr);
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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