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// Copyright 2016 The Chromium Authors
// Use of this source code is governed by a BSD-style license that can be
// found in the LICENSE file.
#include "cc/tiles/mipmap_util.h"
#include <array>
#include <limits>
#include "testing/gtest/include/gtest/gtest.h"
#include "ui/gfx/geometry/test/geometry_util.h"
namespace cc {
namespace {
// Ensures that a basic scale works.
TEST(MipMapUtilTest, Basic) {
const gfx::Size src_size(64, 64);
const gfx::Size target_size(16, 16);
const int target_level = 2;
const SkSize expected_scale = SkSize::Make(0.25f, 0.25f);
EXPECT_EQ(target_level, MipMapUtil::GetLevelForSize(src_size, target_size));
EXPECT_SKSIZE_EQ(expected_scale, MipMapUtil::GetScaleAdjustmentForLevel(
src_size, target_level));
EXPECT_EQ(target_size, MipMapUtil::GetSizeForLevel(src_size, target_level));
EXPECT_SKSIZE_EQ(expected_scale, MipMapUtil::GetScaleAdjustmentForSize(
src_size, target_size));
}
// Ensures that a no-op scale works.
TEST(MipMapUtilTest, NoScale) {
const gfx::Size src_size(64, 64);
const gfx::Size target_size(64, 64);
const int target_level = 0;
const SkSize expected_scale = SkSize::Make(1, 1);
EXPECT_EQ(target_level, MipMapUtil::GetLevelForSize(src_size, target_size));
EXPECT_SKSIZE_EQ(expected_scale, MipMapUtil::GetScaleAdjustmentForLevel(
src_size, target_level));
EXPECT_EQ(target_size, MipMapUtil::GetSizeForLevel(src_size, target_level));
EXPECT_SKSIZE_EQ(expected_scale, MipMapUtil::GetScaleAdjustmentForSize(
src_size, target_size));
}
// Ensures that we return the base mip level if the caller requests an upscale.
TEST(MipMapUtilTest, Upscale) {
const gfx::Size src_size(64, 64);
const gfx::Size target_size(128, 128);
const SkSize result_size = SkSize::Make(1, 1);
const int result_level = 0;
EXPECT_EQ(result_level, MipMapUtil::GetLevelForSize(src_size, target_size));
EXPECT_SKSIZE_EQ(result_size, MipMapUtil::GetScaleAdjustmentForSize(
src_size, target_size));
EXPECT_EQ(src_size, MipMapUtil::GetSizeForLevel(src_size, result_level));
}
// Ensures that the maximum mip level GetLevelForSize will ever return is 30.
TEST(MipMapUtilTest, MaxMipLevel) {
int max_mip_level =
MipMapUtil::GetLevelForSize(gfx::Size(std::numeric_limits<int>::max(),
std::numeric_limits<int>::max()),
gfx::Size(1, 1));
EXPECT_EQ(max_mip_level, 30);
}
// Ensures that we handle mips of a non-square image correctly (the smaller side
// should never be smaller than 1).
TEST(MipMapUtilTest, NonSquare) {
const gfx::Size src_size(1024, 1);
const gfx::Size target_size(64, 1);
const int target_level = 4;
const SkSize expected_scale = SkSize::Make(
static_cast<float>(target_size.width()) / src_size.width(), 1);
EXPECT_EQ(target_level, MipMapUtil::GetLevelForSize(src_size, target_size));
EXPECT_SKSIZE_EQ(expected_scale, MipMapUtil::GetScaleAdjustmentForLevel(
src_size, target_level));
EXPECT_EQ(target_size, MipMapUtil::GetSizeForLevel(src_size, target_level));
EXPECT_SKSIZE_EQ(expected_scale, MipMapUtil::GetScaleAdjustmentForSize(
src_size, target_size));
}
// Ensures that we handle rounding images correctly.
TEST(MipMapUtilTest, Rounding) {
const gfx::Size src_size(49, 49);
const gfx::Size target_size_larger(26, 26);
const gfx::Size target_size_smaller(25, 25);
const int target_level_larger = 0;
const int target_level_smaller = 1;
const SkSize expected_scale_larger = SkSize::Make(1, 1);
const SkSize expected_scale_smaller = SkSize::Make(
static_cast<float>(target_size_smaller.width()) / src_size.width(),
static_cast<float>(target_size_smaller.height()) / src_size.height());
EXPECT_EQ(target_level_larger,
MipMapUtil::GetLevelForSize(src_size, target_size_larger));
EXPECT_EQ(target_level_smaller,
MipMapUtil::GetLevelForSize(src_size, target_size_smaller));
EXPECT_SKSIZE_EQ(
expected_scale_larger,
MipMapUtil::GetScaleAdjustmentForLevel(src_size, target_level_larger));
EXPECT_SKSIZE_EQ(
expected_scale_smaller,
MipMapUtil::GetScaleAdjustmentForLevel(src_size, target_level_smaller));
EXPECT_EQ(src_size,
MipMapUtil::GetSizeForLevel(src_size, target_level_larger));
EXPECT_EQ(target_size_smaller,
MipMapUtil::GetSizeForLevel(src_size, target_level_smaller));
EXPECT_SKSIZE_EQ(expected_scale_larger, MipMapUtil::GetScaleAdjustmentForSize(
src_size, target_size_larger));
EXPECT_SKSIZE_EQ(
expected_scale_smaller,
MipMapUtil::GetScaleAdjustmentForSize(src_size, target_size_smaller));
}
// Ensures that we round up during mip calculation.
TEST(MipMapUtilTest, RoundUp) {
const auto src_sizes = std::to_array<gfx::Size>({
gfx::Size(3, 3),
gfx::Size(5, 7),
gfx::Size(11, 14),
gfx::Size(17, 31),
});
for (int i = 0; i < 4; ++i) {
EXPECT_EQ(MipMapUtil::GetSizeForLevel(src_sizes[i], i + 1),
gfx::Size(2, 2));
}
}
} // namespace
} // namespace cc
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