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// Copyright 2019 The Chromium Authors
// Use of this source code is governed by a BSD-style license that can be
// found in the LICENSE file.
#include "components/paint_preview/common/subset_font.h"
#include "base/base_paths.h"
#include "base/files/file_path.h"
#include "base/files/file_util.h"
#include "base/path_service.h"
#include "build/build_config.h"
#include "components/paint_preview/common/glyph_usage.h"
#include "skia/ext/font_utils.h"
#include "testing/gtest/include/gtest/gtest.h"
#include "third_party/skia/include/core/SkData.h"
#include "third_party/skia/include/core/SkFontMgr.h"
#include "third_party/skia/include/core/SkRefCnt.h"
#include "third_party/skia/include/core/SkStream.h"
#include "third_party/skia/include/core/SkTypeface.h"
namespace paint_preview {
TEST(PaintPreviewSubsetFontTest, TestBasicSubset) {
auto typeface = skia::DefaultTypeface();
ASSERT_NE(typeface, nullptr);
SparseGlyphUsage sparse(typeface->countGlyphs());
sparse.Set(0);
uint16_t glyph_a = typeface->unicharToGlyph('a');
sparse.Set(glyph_a);
uint16_t glyph_t = typeface->unicharToGlyph('t');
sparse.Set(glyph_t);
auto subset_data = SubsetFont(typeface.get(), sparse);
ASSERT_NE(subset_data, nullptr);
SkMemoryStream stream(subset_data);
auto subset_typeface =
SkTypeface::MakeDeserialize(&stream, skia::DefaultFontMgr());
ASSERT_NE(subset_typeface, nullptr);
// Subsetting doesn't guarantee all glyphs are removed, so just check that the
// size is smaller.
auto origin_data =
typeface->serialize(SkTypeface::SerializeBehavior::kDoIncludeData);
EXPECT_LT(subset_data->size(), origin_data->size());
EXPECT_LE(subset_typeface->countTables(), typeface->countTables());
EXPECT_LT(subset_typeface->countGlyphs(), typeface->countGlyphs());
// TODO(ckitagawa): Find a reliable way to check that |glyph_{a, t}| are in
// the subset_typeface. This is non-trivial.
}
// TODO(crbug.com/40198064): Investigate removing the early exits for
// unsupported variation fonts on at least Linux/Android.
#if BUILDFLAG(IS_LINUX) || BUILDFLAG(IS_ANDROID)
namespace {
constexpr SkFourByteTag kItal = SkSetFourByteTag('i', 't', 'a', 'l');
constexpr SkFourByteTag kWdth = SkSetFourByteTag('w', 'd', 't', 'h');
constexpr SkFourByteTag kWght = SkSetFourByteTag('w', 'g', 'h', 't');
} // namespace
TEST(PaintPreviewSubsetFontTest, TestVariantSubset) {
std::vector<SkFontArguments::VariationPosition::Coordinate> axes = {
{kItal, 1}, {kWdth, 100}, {kWght, 700}};
// This is a variant font. Loading it from a file isn't entirely
// straightforward in a platform generic way.
base::FilePath base_path;
CHECK(base::PathService::Get(base::DIR_SRC_TEST_DATA_ROOT, &base_path));
auto final_path = base_path.AppendASCII(
"components/test/data/paint_preview/Roboto-Regular.ttf");
std::string data_str;
ASSERT_TRUE(base::ReadFileToString(final_path, &data_str));
ASSERT_GT(data_str.size(), 0U);
auto data = SkData::MakeWithCopy(data_str.data(), data_str.size());
ASSERT_NE(data, nullptr);
sk_sp<SkFontMgr> mgr = skia::DefaultFontMgr();
sk_sp<SkTypeface> base_typeface = mgr->makeFromData(data);
// Some older OS versions/platforms may not support variation font data.
if (!base_typeface) {
return;
}
// Select the variant.
SkFontArguments args;
SkFontArguments::VariationPosition variations;
variations.coordinates = axes.data();
variations.coordinateCount = axes.size();
args.setVariationDesignPosition(variations);
auto typeface = base_typeface->makeClone(args);
// Some older OS versions/platforms may not support variation font data and
// they fallback. In these cases trying to get variation information may fail.
if (!typeface || typeface->getVariationDesignPosition(nullptr, 0) != 3) {
return;
}
// Subset.
SparseGlyphUsage sparse(typeface->countGlyphs());
sparse.Set(0);
uint16_t glyph_a = typeface->unicharToGlyph('a');
sparse.Set(glyph_a);
uint16_t glyph_t = typeface->unicharToGlyph('t');
sparse.Set(glyph_t);
auto subset_data = SubsetFont(typeface.get(), sparse);
ASSERT_NE(subset_data, nullptr);
SkMemoryStream stream(subset_data);
auto subset_typeface =
SkTypeface::MakeDeserialize(&stream, skia::DefaultFontMgr());
ASSERT_NE(subset_typeface, nullptr);
// Ensure the variants are the same before and after.
auto subset_axes_count =
subset_typeface->getVariationDesignPosition(nullptr, 0);
ASSERT_GT(subset_axes_count, 0);
EXPECT_EQ(static_cast<size_t>(subset_axes_count), axes.size());
std::vector<SkFontArguments::VariationPosition::Coordinate> subset_axes;
subset_axes.resize(subset_axes_count);
ASSERT_GT(subset_typeface->getVariationDesignPosition(subset_axes.data(),
subset_axes.size()),
0);
struct {
bool operator()(SkFontArguments::VariationPosition::Coordinate a,
SkFontArguments::VariationPosition::Coordinate b) {
return a.axis < b.axis;
}
} sort_axes;
std::sort(axes.begin(), axes.end(), sort_axes);
std::sort(subset_axes.begin(), subset_axes.end(), sort_axes);
EXPECT_EQ(axes[0].axis, subset_axes[0].axis);
EXPECT_EQ(axes[0].value, subset_axes[0].value);
EXPECT_EQ(axes[1].axis, subset_axes[1].axis);
EXPECT_EQ(axes[1].value, subset_axes[1].value);
EXPECT_EQ(axes[2].axis, subset_axes[2].axis);
EXPECT_EQ(axes[2].value, subset_axes[2].value);
// Check that something was subsetted.
auto origin_data =
typeface->serialize(SkTypeface::SerializeBehavior::kDoIncludeData);
EXPECT_LT(subset_data->size(), origin_data->size());
EXPECT_LE(subset_typeface->countTables(), typeface->countTables());
EXPECT_LT(subset_typeface->countGlyphs(), typeface->countGlyphs());
}
#endif
} // namespace paint_preview
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