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https://github.com/tesseract-ocr/tesseract.git
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289 lines
11 KiB
C++
289 lines
11 KiB
C++
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#include "tesseract/training/pango_font_info.h"
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#include <stdio.h>
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#include <string.h>
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#include "pango/pango.h"
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#include "tesseract/training/commandlineflags.h"
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#include "tesseract/training/fileio.h"
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DECLARE_STRING_PARAM_FLAG(fonts_dir);
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DECLARE_STRING_PARAM_FLAG(fontconfig_tmpdir);
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DECLARE_BOOL_PARAM_FLAG(use_only_legacy_fonts);
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namespace {
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using tesseract::File;
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using tesseract::FontUtils;
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using tesseract::PangoFontInfo;
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// Fonts in testdata directory
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const char* kExpectedFontNames[] = {"Arab",
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"Arial Bold Italic",
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"DejaVu Sans Ultra-Light",
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"Lohit Hindi",
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#if PANGO_VERSION <= 12005
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"Times New Roman",
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#else
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"Times New Roman,", // Pango v1.36.2
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// requires a trailing
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// ','
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#endif
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"UnBatang",
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"Verdana"};
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// Sample text used in tests.
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const char kArabicText[] = "والفكر والصراع 1234,\nوالفكر والصراع";
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const char kEngText[] = "the quick brown fox jumps over the lazy dog";
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const char kHinText[] = "पिताने विवाह की | हो गई उद्विग्न वह सोचा";
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const char kKorText[] = "이는 것으로";
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// Hindi words containing illegal vowel sequences.
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const char* kBadlyFormedHinWords[] = {
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#if PANGO_VERSION <= 12005
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"उपयोक्ताो", "नहीें", "कहीअे", "पत्रिाका", "छह्णाीस",
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#endif
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// Pango v1.36.2 will render the above words even though they are invalid.
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"प्रंात", nullptr};
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class PangoFontInfoTest : public ::testing::Test {
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protected:
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// Creates a fake fonts.conf file that points to the testdata fonts for
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// fontconfig to initialize with.
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static void SetUpTestCase() {
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FLAGS_fonts_dir = File::JoinPath(FLAGS_test_srcdir, "testdata");
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FLAGS_fontconfig_tmpdir = FLAGS_test_tmpdir;
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FLAGS_use_only_legacy_fonts = false;
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}
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PangoFontInfo font_info_;
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};
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TEST_F(PangoFontInfoTest, TestNonDefaultConstructor) {
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PangoFontInfo font("Arial Bold Italic 12");
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EXPECT_EQ(12, font.font_size());
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EXPECT_EQ("Arial", font.family_name());
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}
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TEST_F(PangoFontInfoTest, DoesParseFontDescriptionName) {
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EXPECT_TRUE(font_info_.ParseFontDescriptionName("Arial Bold Italic 12"));
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EXPECT_EQ(12, font_info_.font_size());
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EXPECT_EQ("Arial", font_info_.family_name());
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EXPECT_TRUE(font_info_.ParseFontDescriptionName("Verdana 10"));
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EXPECT_EQ(10, font_info_.font_size());
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EXPECT_EQ("Verdana", font_info_.family_name());
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EXPECT_TRUE(font_info_.ParseFontDescriptionName("DejaVu Sans Ultra-Light"));
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EXPECT_EQ("DejaVu Sans", font_info_.family_name());
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}
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TEST_F(PangoFontInfoTest, DoesParseMissingFonts) {
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// Font family one of whose faces exists but this one doesn't.
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EXPECT_TRUE(font_info_.ParseFontDescriptionName("Arial Italic 12"));
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EXPECT_EQ(12, font_info_.font_size());
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EXPECT_EQ("Arial", font_info_.family_name());
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// Font family that doesn't exist in testdata. It will still parse the
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// description name. But without the file, it will not be able to populate
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// some font family details, like is_monospace().
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EXPECT_TRUE(font_info_.ParseFontDescriptionName("Georgia 10"));
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EXPECT_EQ(10, font_info_.font_size());
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EXPECT_EQ("Georgia", font_info_.family_name());
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}
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TEST_F(PangoFontInfoTest, DoesGetSpacingProperties) {
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EXPECT_TRUE(font_info_.ParseFontDescriptionName("Arial Italic 12"));
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int x_bearing, x_advance;
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EXPECT_TRUE(font_info_.GetSpacingProperties("A", &x_bearing, &x_advance));
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EXPECT_GT(x_advance, 0);
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EXPECT_TRUE(font_info_.GetSpacingProperties("a", &x_bearing, &x_advance));
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EXPECT_GT(x_advance, 0);
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}
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TEST_F(PangoFontInfoTest, CanRenderString) {
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font_info_.ParseFontDescriptionName("Verdana 12");
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EXPECT_TRUE(font_info_.CanRenderString(kEngText, strlen(kEngText)));
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font_info_.ParseFontDescriptionName("UnBatang 12");
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EXPECT_TRUE(font_info_.CanRenderString(kKorText, strlen(kKorText)));
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font_info_.ParseFontDescriptionName("Lohit Hindi 12");
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EXPECT_TRUE(font_info_.CanRenderString(kHinText, strlen(kHinText)));
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}
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TEST_F(PangoFontInfoTest, CanRenderLigature) {
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font_info_.ParseFontDescriptionName("Arab 12");
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const char kArabicLigature[] = "لا";
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EXPECT_TRUE(
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font_info_.CanRenderString(kArabicLigature, strlen(kArabicLigature)));
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printf("Next word\n");
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EXPECT_TRUE(font_info_.CanRenderString(kArabicText, strlen(kArabicText)));
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}
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TEST_F(PangoFontInfoTest, CannotRenderUncoveredString) {
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font_info_.ParseFontDescriptionName("Verdana 12");
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EXPECT_FALSE(font_info_.CanRenderString(kKorText, strlen(kKorText)));
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}
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TEST_F(PangoFontInfoTest, CannotRenderInvalidString) {
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font_info_.ParseFontDescriptionName("Lohit Hindi 12");
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for (int i = 0; kBadlyFormedHinWords[i] != nullptr; ++i) {
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EXPECT_FALSE(font_info_.CanRenderString(kBadlyFormedHinWords[i],
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strlen(kBadlyFormedHinWords[i])))
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<< "Can render " << kBadlyFormedHinWords[i];
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}
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}
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TEST_F(PangoFontInfoTest, CanDropUncoveredChars) {
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font_info_.ParseFontDescriptionName("Verdana 12");
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// Verdana cannot render the "ff" ligature
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string word = "office";
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EXPECT_EQ(1, font_info_.DropUncoveredChars(&word));
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EXPECT_EQ("oice", word);
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// Don't drop non-letter characters like word joiners.
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const char* kJoiners[] = {
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"\u2060", // U+2060 (WJ)
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"\u200C", // U+200C (ZWJ)
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"\u200D" // U+200D (ZWNJ)
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};
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for (int i = 0; i < ARRAYSIZE(kJoiners); ++i) {
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word = kJoiners[i];
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EXPECT_EQ(0, font_info_.DropUncoveredChars(&word));
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EXPECT_STREQ(kJoiners[i], word.c_str());
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}
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}
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// ------------------------ FontUtils ------------------------------------
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class FontUtilsTest : public ::testing::Test {
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protected:
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// Creates a fake fonts.conf file that points to the testdata fonts for
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// fontconfig to initialize with.
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static void SetUpTestCase() {
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FLAGS_fonts_dir = File::JoinPath(FLAGS_test_srcdir, "testdata");
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FLAGS_fontconfig_tmpdir = FLAGS_test_tmpdir;
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}
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void CountUnicodeChars(const char* utf8_text,
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std::unordered_map<char32, inT64>* ch_map) {
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ch_map->clear();
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UnicodeText ut;
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ut.PointToUTF8(utf8_text, strlen(utf8_text));
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for (UnicodeText::const_iterator it = ut.begin(); it != ut.end(); ++it) {
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if (UnicodeProps::IsWhitespace(*it)) continue;
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++(*ch_map)[*it];
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}
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}
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};
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TEST_F(FontUtilsTest, DoesFindAvailableFonts) {
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EXPECT_TRUE(FontUtils::IsAvailableFont("Arial Bold Italic"));
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EXPECT_TRUE(FontUtils::IsAvailableFont("Verdana"));
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EXPECT_TRUE(FontUtils::IsAvailableFont("DejaVu Sans Ultra-Light"));
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// Test that we can support font name convention for Pango v1.30.2 even when
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// we are running an older version.
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EXPECT_TRUE(FontUtils::IsAvailableFont("Times New Roman,"));
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}
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TEST_F(FontUtilsTest, DoesDetectMissingFonts) {
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// Only bold italic face is available.
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EXPECT_FALSE(FontUtils::IsAvailableFont("Arial"));
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// Don't have a ttf for the Courier family.
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EXPECT_FALSE(FontUtils::IsAvailableFont("Courier"));
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// Pango "synthesizes" the italic font from the available Verdana Regular and
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// includes it in its list, but it is not really loadable.
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EXPECT_FALSE(FontUtils::IsAvailableFont("Verdana Italic"));
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// We have "Dejavu Sans Ultra-Light" but not its medium weight counterpart.
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EXPECT_FALSE(FontUtils::IsAvailableFont("DejaVu Sans"));
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}
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TEST_F(FontUtilsTest, DoesListAvailableFonts) {
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const std::vector<string>& fonts = FontUtils::ListAvailableFonts();
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EXPECT_THAT(fonts, ::testing::ElementsAreArray(kExpectedFontNames));
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for (int i = 0; i < fonts.size(); ++i) {
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PangoFontInfo font_info;
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EXPECT_TRUE(font_info.ParseFontDescriptionName(fonts[i]));
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}
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}
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TEST_F(FontUtilsTest, DoesFindBestFonts) {
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string fonts_list;
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std::unordered_map<char32, inT64> ch_map;
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CountUnicodeChars(kEngText, &ch_map);
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EXPECT_EQ(26, ch_map.size()); // 26 letters
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std::vector<std::pair<const char*, std::vector<bool> > > font_flags;
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string best_list = FontUtils::BestFonts(ch_map, &font_flags);
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EXPECT_TRUE(best_list.size());
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// All fonts except Lohit Hindi should render English text.
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EXPECT_EQ(ARRAYSIZE(kExpectedFontNames) - 1, font_flags.size());
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CountUnicodeChars(kKorText, &ch_map);
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best_list = FontUtils::BestFonts(ch_map, &font_flags);
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EXPECT_TRUE(best_list.size());
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// Only UnBatang font family is able to render korean.
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EXPECT_EQ(1, font_flags.size());
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EXPECT_STREQ("UnBatang", font_flags[0].first);
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}
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TEST_F(FontUtilsTest, DoesSelectFont) {
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const char* kLangText[] = {kArabicText, kEngText, kHinText, kKorText, nullptr};
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const char* kLangNames[] = {"Arabic", "English", "Hindi", "Korean", nullptr};
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for (int i = 0; kLangText[i] != nullptr; ++i) {
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SCOPED_TRACE(kLangNames[i]);
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std::vector<string> graphemes;
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string selected_font;
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EXPECT_TRUE(FontUtils::SelectFont(kLangText[i], strlen(kLangText[i]),
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&selected_font, &graphemes));
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EXPECT_TRUE(selected_font.size());
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EXPECT_TRUE(graphemes.size());
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}
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}
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TEST_F(FontUtilsTest, DoesFailToSelectFont) {
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const char kMixedScriptText[] = "पिताने विवाह की | والفكر والصراع";
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std::vector<string> graphemes;
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string selected_font;
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EXPECT_FALSE(FontUtils::SelectFont(kMixedScriptText, strlen(kMixedScriptText),
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&selected_font, &graphemes));
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}
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TEST_F(FontUtilsTest, GetAllRenderableCharacters) {
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const int32 kHindiChar = 0x0905;
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const int32 kArabicChar = 0x0623;
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const int32 kMongolianChar = 0x180E; // Mongolian vowel separator
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const int32 kOghamChar = 0x1680; // Ogham space mark
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std::vector<bool> unicode_mask;
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FontUtils::GetAllRenderableCharacters(&unicode_mask);
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EXPECT_TRUE(unicode_mask['A']);
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EXPECT_TRUE(unicode_mask['1']);
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EXPECT_TRUE(unicode_mask[kHindiChar]);
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EXPECT_TRUE(unicode_mask[kArabicChar]);
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EXPECT_FALSE(unicode_mask[kMongolianChar]); // no font for mongolian.
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EXPECT_FALSE(unicode_mask[kOghamChar]); // no font for ogham.
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unicode_mask.clear();
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std::vector<string> selected_fonts;
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selected_fonts.push_back("Lohit Hindi");
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FontUtils::GetAllRenderableCharacters(selected_fonts, &unicode_mask);
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EXPECT_TRUE(unicode_mask['1']);
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EXPECT_TRUE(unicode_mask[kHindiChar]);
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EXPECT_FALSE(unicode_mask['A']); // Lohit doesn't render English,
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EXPECT_FALSE(unicode_mask[kArabicChar]); // or Arabic,
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EXPECT_FALSE(unicode_mask[kMongolianChar]); // or Mongolian,
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EXPECT_FALSE(unicode_mask[kOghamChar]); // or Ogham.
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// Check that none of the included fonts cover the Mongolian or Ogham space
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// characters.
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for (int f = 0; f < ARRAYSIZE(kExpectedFontNames); ++f) {
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SCOPED_TRACE(absl::StrCat("Testing ", kExpectedFontNames[f]));
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FontUtils::GetAllRenderableCharacters(kExpectedFontNames[f], &unicode_mask);
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EXPECT_FALSE(unicode_mask[kOghamChar]);
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EXPECT_FALSE(unicode_mask[kMongolianChar]);
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}
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}
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} // namespace
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