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pango_font_info_test.cc
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pango_font_info_test.cc
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// (C) Copyright 2017, Google Inc.
// Licensed under the Apache License, Version 2.0 (the "License");
// you may not use this file except in compliance with the License.
// You may obtain a copy of the License at
// http://www.apache.org/licenses/LICENSE-2.0
// Unless required by applicable law or agreed to in writing, software
// distributed under the License is distributed on an "AS IS" BASIS,
// WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
// See the License for the specific language governing permissions and
// limitations under the License.
#include "pango_font_info.h"
#include <pango/pango.h>
#include <cstdio>
#include <string>
#include "commandlineflags.h"
#include "fileio.h"
#include "gmock/gmock-matchers.h" // for EXPECT_THAT
#include "include_gunit.h"
#ifdef INCLUDE_TENSORFLOW
# include "util/utf8/unicodetext.h" // for UnicodeText
#endif
namespace tesseract {
// Fonts in testdata directory
const char *kExpectedFontNames[] = {"Arab",
"Arial Bold Italic",
"DejaVu Sans Ultra-Light",
"Lohit Hindi",
#if PANGO_VERSION <= 12005
"Times New Roman",
#else
"Times New Roman,", // Pango v1.36.2 requires a trailing ','
#endif
"UnBatang",
"Verdana"};
// Sample text used in tests.
const char kArabicText[] = "والفكر والصراع 1234,\nوالفكر والصراع";
const char kEngText[] = "the quick brown fox jumps over the lazy dog";
const char kHinText[] = "पिताने विवाह की | हो गई उद्विग्न वह सोचा";
const char kKorText[] = "이는 것으로";
// Hindi words containing illegal vowel sequences.
const char *kBadlyFormedHinWords[] = {
#if PANGO_VERSION <= 12005
"उपयोक्ताो", "नहीें", "कहीअे", "पत्रिाका", "छह्णाीस",
#endif
// Pango v1.36.2 will render the above words even though they are invalid.
"प्रंात", nullptr};
static PangoFontMap *font_map;
class PangoFontInfoTest : public ::testing::Test {
protected:
void SetUp() override {
if (!font_map) {
font_map = pango_cairo_font_map_new_for_font_type(CAIRO_FONT_TYPE_FT);
}
pango_cairo_font_map_set_default(PANGO_CAIRO_FONT_MAP(font_map));
}
// Creates a fake fonts.conf file that points to the testdata fonts for
// fontconfig to initialize with.
static void SetUpTestCase() {
static std::locale system_locale("");
std::locale::global(system_locale);
FLAGS_fonts_dir = TESTING_DIR;
FLAGS_fontconfig_tmpdir = FLAGS_test_tmpdir;
file::MakeTmpdir();
PangoFontInfo::SoftInitFontConfig(); // init early
}
PangoFontInfo font_info_;
};
TEST_F(PangoFontInfoTest, TestNonDefaultConstructor) {
PangoFontInfo font("Arial Bold Italic 12");
EXPECT_EQ(12, font.font_size());
EXPECT_EQ("Arial", font.family_name());
}
TEST_F(PangoFontInfoTest, DoesParseFontDescriptionName) {
EXPECT_TRUE(font_info_.ParseFontDescriptionName("Arial Bold Italic 12"));
EXPECT_EQ(12, font_info_.font_size());
EXPECT_EQ("Arial", font_info_.family_name());
EXPECT_TRUE(font_info_.ParseFontDescriptionName("Verdana 10"));
EXPECT_EQ(10, font_info_.font_size());
EXPECT_EQ("Verdana", font_info_.family_name());
EXPECT_TRUE(font_info_.ParseFontDescriptionName("DejaVu Sans Ultra-Light"));
EXPECT_EQ("DejaVu Sans", font_info_.family_name());
}
TEST_F(PangoFontInfoTest, DoesParseMissingFonts) {
// Font family one of whose faces exists but this one doesn't.
EXPECT_TRUE(font_info_.ParseFontDescriptionName("Arial Italic 12"));
EXPECT_EQ(12, font_info_.font_size());
EXPECT_EQ("Arial", font_info_.family_name());
// Font family that doesn't exist in testdata. It will still parse the
// description name. But without the file, it will not be able to populate
// some font family details, like is_monospace().
EXPECT_TRUE(font_info_.ParseFontDescriptionName("Georgia 10"));
EXPECT_EQ(10, font_info_.font_size());
EXPECT_EQ("Georgia", font_info_.family_name());
}
TEST_F(PangoFontInfoTest, DoesGetSpacingProperties) {
EXPECT_TRUE(font_info_.ParseFontDescriptionName("Arial Italic 12"));
int x_bearing, x_advance;
EXPECT_TRUE(font_info_.GetSpacingProperties("A", &x_bearing, &x_advance));
EXPECT_GT(x_advance, 0);
EXPECT_TRUE(font_info_.GetSpacingProperties("a", &x_bearing, &x_advance));
EXPECT_GT(x_advance, 0);
}
TEST_F(PangoFontInfoTest, CanRenderString) {
font_info_.ParseFontDescriptionName("Verdana 12");
EXPECT_TRUE(font_info_.CanRenderString(kEngText, strlen(kEngText)));
font_info_.ParseFontDescriptionName("UnBatang 12");
EXPECT_TRUE(font_info_.CanRenderString(kKorText, strlen(kKorText)));
font_info_.ParseFontDescriptionName("Lohit Hindi 12");
EXPECT_TRUE(font_info_.CanRenderString(kHinText, strlen(kHinText)));
}
TEST_F(PangoFontInfoTest, CanRenderLigature) {
font_info_.ParseFontDescriptionName("Arab 12");
const char kArabicLigature[] = "لا";
EXPECT_TRUE(font_info_.CanRenderString(kArabicLigature, strlen(kArabicLigature)));
printf("Next word\n");
EXPECT_TRUE(font_info_.CanRenderString(kArabicText, strlen(kArabicText)));
}
TEST_F(PangoFontInfoTest, CannotRenderUncoveredString) {
font_info_.ParseFontDescriptionName("Verdana 12");
EXPECT_FALSE(font_info_.CanRenderString(kKorText, strlen(kKorText)));
}
TEST_F(PangoFontInfoTest, CannotRenderInvalidString) {
font_info_.ParseFontDescriptionName("Lohit Hindi 12");
for (int i = 0; kBadlyFormedHinWords[i] != nullptr; ++i) {
EXPECT_FALSE(
font_info_.CanRenderString(kBadlyFormedHinWords[i], strlen(kBadlyFormedHinWords[i])))
<< "Can render " << kBadlyFormedHinWords[i];
}
}
TEST_F(PangoFontInfoTest, CanDropUncoveredChars) {
font_info_.ParseFontDescriptionName("Verdana 12");
// Verdana cannot render the "ff" ligature
std::string word = "office";
EXPECT_EQ(1, font_info_.DropUncoveredChars(&word));
EXPECT_EQ("oice", word);
// Don't drop non-letter characters like word joiners.
const char *kJoiners[] = {
"\u2060", // U+2060 (WJ)
"\u200C", // U+200C (ZWJ)
"\u200D" // U+200D (ZWNJ)
};
for (auto &kJoiner : kJoiners) {
word = kJoiner;
EXPECT_EQ(0, font_info_.DropUncoveredChars(&word));
EXPECT_STREQ(kJoiner, word.c_str());
}
}
// ------------------------ FontUtils ------------------------------------
class FontUtilsTest : public ::testing::Test {
protected:
void SetUp() override {
file::MakeTmpdir();
}
// Creates a fake fonts.conf file that points to the testdata fonts for
// fontconfig to initialize with.
static void SetUpTestCase() {
FLAGS_fonts_dir = TESTING_DIR;
FLAGS_fontconfig_tmpdir = FLAGS_test_tmpdir;
if (!font_map) {
font_map = pango_cairo_font_map_new_for_font_type(CAIRO_FONT_TYPE_FT);
}
pango_cairo_font_map_set_default(PANGO_CAIRO_FONT_MAP(font_map));
}
#ifdef INCLUDE_TENSORFLOW
void CountUnicodeChars(const char *utf8_text, std::unordered_map<char32, int64_t> *ch_map) {
ch_map->clear();
UnicodeText ut;
ut.PointToUTF8(utf8_text, strlen(utf8_text));
for (UnicodeText::const_iterator it = ut.begin(); it != ut.end(); ++it) {
# if 0
if (UnicodeProps::IsWhitespace(*it)) continue;
# else
if (std::isspace(*it))
continue;
# endif
++(*ch_map)[*it];
}
}
#endif
};
TEST_F(FontUtilsTest, DoesFindAvailableFonts) {
EXPECT_TRUE(FontUtils::IsAvailableFont("Arial Bold Italic"));
EXPECT_TRUE(FontUtils::IsAvailableFont("Verdana"));
EXPECT_TRUE(FontUtils::IsAvailableFont("DejaVu Sans Ultra-Light"));
// Test that we can support font name convention for Pango v1.30.2 even when
// we are running an older version.
EXPECT_TRUE(FontUtils::IsAvailableFont("Times New Roman,"));
}
TEST_F(FontUtilsTest, DoesDetectMissingFonts) {
// Only bold italic face is available.
EXPECT_FALSE(FontUtils::IsAvailableFont("Arial"));
// Don't have a ttf for the Courier family.
EXPECT_FALSE(FontUtils::IsAvailableFont("Courier"));
// Pango "synthesizes" the italic font from the available Verdana Regular and
// includes it in its list, but it is not really loadable.
EXPECT_FALSE(FontUtils::IsAvailableFont("Verdana Italic"));
// We have "Dejavu Sans Ultra-Light" but not its medium weight counterpart.
EXPECT_FALSE(FontUtils::IsAvailableFont("DejaVu Sans"));
}
TEST_F(FontUtilsTest, DoesListAvailableFonts) {
const std::vector<std::string> &fonts = FontUtils::ListAvailableFonts();
EXPECT_THAT(fonts, ::testing::ElementsAreArray(kExpectedFontNames));
for (auto &font : fonts) {
PangoFontInfo font_info;
EXPECT_TRUE(font_info.ParseFontDescriptionName(font));
}
}
#ifdef INCLUDE_TENSORFLOW
TEST_F(FontUtilsTest, DoesFindBestFonts) {
std::string fonts_list;
std::unordered_map<char32, int64_t> ch_map;
CountUnicodeChars(kEngText, &ch_map);
EXPECT_EQ(26, ch_map.size()); // 26 letters
std::vector<std::pair<const char *, std::vector<bool> > > font_flags;
std::string best_list = FontUtils::BestFonts(ch_map, &font_flags);
EXPECT_TRUE(best_list.size());
// All fonts except Lohit Hindi should render English text.
EXPECT_EQ(countof(kExpectedFontNames) - 1, font_flags.size());
CountUnicodeChars(kKorText, &ch_map);
best_list = FontUtils::BestFonts(ch_map, &font_flags);
EXPECT_TRUE(best_list.size());
// Only UnBatang font family is able to render korean.
EXPECT_EQ(1, font_flags.size());
EXPECT_STREQ("UnBatang", font_flags[0].first);
}
#endif
TEST_F(FontUtilsTest, DoesSelectFont) {
const char *kLangText[] = {kArabicText, kEngText, kHinText, kKorText, nullptr};
const char *kLangNames[] = {"Arabic", "English", "Hindi", "Korean", nullptr};
for (int i = 0; kLangText[i] != nullptr; ++i) {
SCOPED_TRACE(kLangNames[i]);
std::vector<std::string> graphemes;
std::string selected_font;
EXPECT_TRUE(
FontUtils::SelectFont(kLangText[i], strlen(kLangText[i]), &selected_font, &graphemes));
EXPECT_TRUE(selected_font.size());
EXPECT_TRUE(graphemes.size());
}
}
TEST_F(FontUtilsTest, DoesFailToSelectFont) {
const char kMixedScriptText[] = "पिताने विवाह की | والفكر والصراع";
std::vector<std::string> graphemes;
std::string selected_font;
EXPECT_FALSE(FontUtils::SelectFont(kMixedScriptText, strlen(kMixedScriptText), &selected_font,
&graphemes));
}
#if 0
// Needs fix. FontUtils::GetAllRenderableCharacters was removed
// because of deprecated pango_coverage_max.
TEST_F(FontUtilsTest, GetAllRenderableCharacters) {
const int32_t kHindiChar = 0x0905;
const int32_t kArabicChar = 0x0623;
const int32_t kMongolianChar = 0x180E; // Mongolian vowel separator
const int32_t kOghamChar = 0x1680; // Ogham space mark
std::vector<bool> unicode_mask;
FontUtils::GetAllRenderableCharacters(&unicode_mask);
EXPECT_TRUE(unicode_mask['A']);
EXPECT_TRUE(unicode_mask['1']);
EXPECT_TRUE(unicode_mask[kHindiChar]);
EXPECT_TRUE(unicode_mask[kArabicChar]);
EXPECT_FALSE(unicode_mask[kMongolianChar]); // no font for mongolian.
# if 0 // TODO: check fails because DejaVu Sans Ultra-Light supports ogham
EXPECT_FALSE(unicode_mask[kOghamChar]); // no font for ogham.
# endif
unicode_mask.clear();
std::vector<std::string> selected_fonts;
selected_fonts.push_back("Lohit Hindi");
FontUtils::GetAllRenderableCharacters(selected_fonts, &unicode_mask);
EXPECT_TRUE(unicode_mask['1']);
EXPECT_TRUE(unicode_mask[kHindiChar]);
EXPECT_FALSE(unicode_mask['A']); // Lohit doesn't render English,
EXPECT_FALSE(unicode_mask[kArabicChar]); // or Arabic,
EXPECT_FALSE(unicode_mask[kMongolianChar]); // or Mongolian,
EXPECT_FALSE(unicode_mask[kOghamChar]); // or Ogham.
unicode_mask.clear();
// Check that none of the included fonts cover the Mongolian or Ogham space
// characters.
for (size_t f = 0; f < countof(kExpectedFontNames); ++f) {
std::string tracestring = "Testing " + kExpectedFontNames[f];
SCOPED_TRACE(tracestring);
FontUtils::GetAllRenderableCharacters(kExpectedFontNames[f], &unicode_mask);
# if 0 // TODO: check fails because DejaVu Sans Ultra-Light supports ogham
EXPECT_FALSE(unicode_mask[kOghamChar]);
# endif
EXPECT_FALSE(unicode_mask[kMongolianChar]);
unicode_mask.clear();
}
}
#endif
} // namespace tesseract