tdf#58941 implement retrieving font features and structures

This adds the following:
- Retrieving of features using HarfBuzz
- Retrieving of feature definitions from graphite fonts
- Adds description texts of OpenType features
- Tests for retrieving features (Linux Libertine G graphite font)
and making sure the features and definitions are what we
expect.

Change-Id: I51573fe086e59c6228cb546bbfac95ac53824c47
Reviewed-on: https://gerrit.libreoffice.org/55892
Tested-by: Jenkins
Reviewed-by: Tomaž Vajngerl <quikee@gmail.com>

1 files changed, 110 insertions, 0 deletions

diff --git a/vcl/qa/cppunit/FontFeatureTest.cxx b/vcl/qa/cppunit/FontFeatureTest.cxx
new file mode 100644
index 000000000000..0bb28e306139
--- /dev/null
+++ b/vcl/qa/cppunit/FontFeatureTest.cxx
@@ -0,0 +1,110 @@
+/* -*- Mode: C++; tab-width: 4; indent-tabs-mode: nil; c-basic-offset: 4 -*- */
+/*
+ * This file is part of the LibreOffice project.
+ *
+ * This Source Code Form is subject to the terms of the Mozilla Public
+ * License, v. 2.0. If a copy of the MPL was not distributed with this
+ * file, You can obtain one at http://mozilla.org/MPL/2.0/.
+ */
+
+#include <test/bootstrapfixture.hxx>
+#include <cppunit/TestAssert.h>
+#include <cppunit/TestFixture.h>
+#include <vcl/font/Feature.hxx>
+
+#include <vcl/virdev.hxx>
+#include <vcl/svapp.hxx>
+
+class FontFeatureTest : public test::BootstrapFixture
+{
+public:
+    FontFeatureTest()
+        : BootstrapFixture(true, false)
+    {
+    }
+
+    void testGetFontFeatures();
+
+    CPPUNIT_TEST_SUITE(FontFeatureTest);
+    CPPUNIT_TEST(testGetFontFeatures);
+    CPPUNIT_TEST_SUITE_END();
+};
+
+void FontFeatureTest::testGetFontFeatures()
+{
+    ScopedVclPtrInstance<VirtualDevice> aVDev(*Application::GetDefaultDevice(),
+                                              DeviceFormat::DEFAULT, DeviceFormat::DEFAULT);
+    aVDev->SetOutputSizePixel(Size(10, 10));
+
+    vcl::Font aFont = aVDev->GetFont();
+    aFont.SetFamilyName("Linux Libertine G");
+    aVDev->SetFont(aFont);
+
+    std::vector<vcl::font::Feature> rFontFeatures;
+    CPPUNIT_ASSERT(aVDev->GetFontFeatures(rFontFeatures));
+
+    // We're interested only in defaults here
+    std::vector<vcl::font::Feature> rDefaultFontFeatures;
+    OUString aFeaturesString;
+    for (vcl::font::Feature const& rFeature : rFontFeatures)
+    {
+        if (rFeature.m_aID.m_aScriptCode == vcl::font::featureCode("DFLT")
+            && rFeature.m_aID.m_aLanguageCode == vcl::font::featureCode("dflt"))
+        {
+            rDefaultFontFeatures.push_back(rFeature);
+            aFeaturesString += vcl::font::featureCodeAsString(rFeature.m_aID.m_aFeatureCode) + " ";
+        }
+    }
+
+    CPPUNIT_ASSERT_EQUAL(size_t(31), rDefaultFontFeatures.size());
+
+    OUString aExpectedFeaturesString = "aalt c2sc case ccmp dlig fina frac hlig "
+                                       "liga lnum nalt onum pnum salt sinf smcp "
+                                       "ss01 ss02 ss03 ss04 ss05 ss06 sups tnum "
+                                       "zero cpsp kern lfbd mark mkmk rtbd ";
+    CPPUNIT_ASSERT_EQUAL(aExpectedFeaturesString, aFeaturesString);
+
+    // Check C2SC feature
+    {
+        vcl::font::Feature& rFeature = rDefaultFontFeatures[1];
+        CPPUNIT_ASSERT_EQUAL(vcl::font::featureCode("c2sc"), rFeature.m_aID.m_aFeatureCode);
+
+        vcl::font::FeatureDefinition& rFracFeatureDefinition = rFeature.m_aDefinition;
+        CPPUNIT_ASSERT_EQUAL(vcl::font::featureCode("c2sc"), rFracFeatureDefinition.getCode());
+        CPPUNIT_ASSERT(!rFracFeatureDefinition.getDescription().isEmpty());
+        CPPUNIT_ASSERT_EQUAL(vcl::font::FeatureParameterType::BOOL,
+                             rFracFeatureDefinition.getType());
+
+        CPPUNIT_ASSERT_EQUAL(size_t(0), rFracFeatureDefinition.getEnumParameters().size());
+    }
+
+    // Check FRAC feature
+    {
+        vcl::font::Feature& rFeature = rDefaultFontFeatures[6];
+        CPPUNIT_ASSERT_EQUAL(vcl::font::featureCode("frac"), rFeature.m_aID.m_aFeatureCode);
+
+        vcl::font::FeatureDefinition& rFracFeatureDefinition = rFeature.m_aDefinition;
+        CPPUNIT_ASSERT_EQUAL(vcl::font::featureCode("frac"), rFracFeatureDefinition.getCode());
+        CPPUNIT_ASSERT(!rFracFeatureDefinition.getDescription().isEmpty());
+        CPPUNIT_ASSERT_EQUAL(vcl::font::FeatureParameterType::ENUM,
+                             rFracFeatureDefinition.getType());
+
+        CPPUNIT_ASSERT_EQUAL(size_t(2), rFracFeatureDefinition.getEnumParameters().size());
+
+        vcl::font::FeatureParameter const& rParameter1
+            = rFracFeatureDefinition.getEnumParameters()[0];
+        CPPUNIT_ASSERT_EQUAL(sal_uInt32(1), rParameter1.getCode());
+        CPPUNIT_ASSERT(!rParameter1.getDescription().isEmpty());
+
+        vcl::font::FeatureParameter const& rParameter2
+            = rFracFeatureDefinition.getEnumParameters()[1];
+        CPPUNIT_ASSERT_EQUAL(sal_uInt32(2), rParameter2.getCode());
+        CPPUNIT_ASSERT(!rParameter2.getDescription().isEmpty());
+    }
+}
+
+CPPUNIT_TEST_SUITE_REGISTRATION(FontFeatureTest);
+
+CPPUNIT_PLUGIN_IMPLEMENT();
+
+/* vim:set shiftwidth=4 softtabstop=4 expandtab: */