tdf#163105 Use HB data while selecting kashida insertion positions

Previously, Writer and Edit Engine would skip inserting kashida in words
if the highest-priority candidate position is marked as invalid by
HarfBuzz. This would happen even if the word contained multiple
lower-ranked valid candidate positions.

This change updates Writer and Edit Engine to pass HarfBuzz kashida
position data to the selection algorithm. The algorithm has been updated
to return the highest-priority valid position, if any. The algorithm has
also been updated to use raw positions marked as valid by HarfBuzz as a
fallback, if no better positions could be found.

Change-Id: I40c6432c4607aee197e8767e5667db504469956a
Reviewed-on: https://gerrit.libreoffice.org/c/core/+/173963
Tested-by: Jenkins
Reviewed-by: Jonathan Clark <jonathan@libreoffice.org>

4 files changed, 339 insertions, 1 deletions

diff --git a/vcl/qa/cppunit/pdfexport/data/tdf163105-editeng.fodt b/vcl/qa/cppunit/pdfexport/data/tdf163105-editeng.fodt
new file mode 100644
index 000000000000..55c7fa2ba93e
--- /dev/null
+++ b/vcl/qa/cppunit/pdfexport/data/tdf163105-editeng.fodt
@@ -0,0 +1,131 @@
+<?xml version='1.0' encoding='UTF-8'?>
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+  <style:font-face style:name="Noto Serif CJK SC" svg:font-family="'Noto Serif CJK SC'" style:font-family-generic="system" style:font-pitch="variable"/>
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+ <office:master-styles>
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+</office:document>
\ No newline at end of file
diff --git a/vcl/qa/cppunit/pdfexport/data/tdf163105.fodt b/vcl/qa/cppunit/pdfexport/data/tdf163105-kashida-spaces.fodt
index eae83caedc1d..eae83caedc1d 100644
--- a/vcl/qa/cppunit/pdfexport/data/tdf163105.fodt
+++ b/vcl/qa/cppunit/pdfexport/data/tdf163105-kashida-spaces.fodt
diff --git a/vcl/qa/cppunit/pdfexport/data/tdf163105-writer.fodt b/vcl/qa/cppunit/pdfexport/data/tdf163105-writer.fodt
new file mode 100644
index 000000000000..8766d411fcd6
--- /dev/null
+++ b/vcl/qa/cppunit/pdfexport/data/tdf163105-writer.fodt
@@ -0,0 +1,114 @@
+<?xml version='1.0' encoding='UTF-8'?>
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+  <style:font-face style:name="Noto Sans" svg:font-family="'Noto Sans'" style:font-family-generic="swiss"/>
+  <style:font-face style:name="Noto Serif CJK SC" svg:font-family="'Noto Serif CJK SC'" style:font-family-generic="system" style:font-pitch="variable"/>
+ </office:font-face-decls>
+ <office:styles>
+  <style:default-style style:family="graphic">
+   <style:graphic-properties svg:stroke-color="#3465a4" draw:fill-color="#729fcf" fo:wrap-option="no-wrap" draw:shadow-offset-x="0.1181in" draw:shadow-offset-y="0.1181in" draw:start-line-spacing-horizontal="0.1114in" draw:start-line-spacing-vertical="0.1114in" draw:end-line-spacing-horizontal="0.1114in" draw:end-line-spacing-vertical="0.1114in" style:flow-with-text="false"/>
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+    <style:tab-stops/>
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+  <style:default-style style:family="paragraph">
+   <style:paragraph-properties fo:orphans="2" fo:widows="2" fo:hyphenation-ladder-count="no-limit" fo:hyphenation-keep="auto" loext:hyphenation-keep-type="column" style:text-autospace="ideograph-alpha" style:punctuation-wrap="hanging" style:line-break="strict" style:tab-stop-distance="0.4925in" style:writing-mode="page"/>
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+   <style:table-row-properties fo:keep-together="auto"/>
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+  <text:outline-style style:name="Outline">
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+    <style:list-level-properties text:list-level-position-and-space-mode="label-alignment">
+     <style:list-level-label-alignment text:label-followed-by="listtab"/>
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+   </text:outline-level-style>
+   <text:outline-level-style text:level="3" style:num-format="">
+    <style:list-level-properties text:list-level-position-and-space-mode="label-alignment">
+     <style:list-level-label-alignment text:label-followed-by="listtab"/>
+    </style:list-level-properties>
+   </text:outline-level-style>
+   <text:outline-level-style text:level="4" style:num-format="">
+    <style:list-level-properties text:list-level-position-and-space-mode="label-alignment">
+     <style:list-level-label-alignment text:label-followed-by="listtab"/>
+    </style:list-level-properties>
+   </text:outline-level-style>
+   <text:outline-level-style text:level="5" style:num-format="">
+    <style:list-level-properties text:list-level-position-and-space-mode="label-alignment">
+     <style:list-level-label-alignment text:label-followed-by="listtab"/>
+    </style:list-level-properties>
+   </text:outline-level-style>
+   <text:outline-level-style text:level="6" style:num-format="">
+    <style:list-level-properties text:list-level-position-and-space-mode="label-alignment">
+     <style:list-level-label-alignment text:label-followed-by="listtab"/>
+    </style:list-level-properties>
+   </text:outline-level-style>
+   <text:outline-level-style text:level="7" style:num-format="">
+    <style:list-level-properties text:list-level-position-and-space-mode="label-alignment">
+     <style:list-level-label-alignment text:label-followed-by="listtab"/>
+    </style:list-level-properties>
+   </text:outline-level-style>
+   <text:outline-level-style text:level="8" style:num-format="">
+    <style:list-level-properties text:list-level-position-and-space-mode="label-alignment">
+     <style:list-level-label-alignment text:label-followed-by="listtab"/>
+    </style:list-level-properties>
+   </text:outline-level-style>
+   <text:outline-level-style text:level="9" style:num-format="">
+    <style:list-level-properties text:list-level-position-and-space-mode="label-alignment">
+     <style:list-level-label-alignment text:label-followed-by="listtab"/>
+    </style:list-level-properties>
+   </text:outline-level-style>
+   <text:outline-level-style text:level="10" style:num-format="">
+    <style:list-level-properties text:list-level-position-and-space-mode="label-alignment">
+     <style:list-level-label-alignment text:label-followed-by="listtab"/>
+    </style:list-level-properties>
+   </text:outline-level-style>
+  </text:outline-style>
+  <text:notes-configuration text:note-class="footnote" style:num-format="1" text:start-value="0" text:footnotes-position="page" text:start-numbering-at="document"/>
+  <text:notes-configuration text:note-class="endnote" style:num-format="i" text:start-value="0"/>
+  <text:linenumbering-configuration text:number-lines="false" text:offset="0.1965in" style:num-format="1" text:number-position="left" text:increment="5"/>
+  </office:styles>
+ <office:automatic-styles>
+  <style:style style:name="P1" style:family="paragraph" style:parent-style-name="Standard">
+   <style:paragraph-properties fo:text-align="justify" style:justify-single-word="false" style:writing-mode="rl-tb"/>
+  </style:style>
+  <style:page-layout style:name="pm1">
+   <style:page-layout-properties fo:page-width="8.2681in" fo:page-height="11.6929in" style:num-format="1" style:print-orientation="portrait" fo:margin-top="0.7874in" fo:margin-bottom="0.7874in" fo:margin-left="0.7874in" fo:margin-right="0.7874in" style:writing-mode="lr-tb" style:footnote-max-height="0in" loext:margin-gutter="0in">
+    <style:footnote-sep style:width="0.0071in" style:distance-before-sep="0.0398in" style:distance-after-sep="0.0398in" style:line-style="solid" style:adjustment="left" style:rel-width="25%" style:color="#000000"/>
+   </style:page-layout-properties>
+   <style:header-style/>
+   <style:footer-style/>
+  </style:page-layout>
+ </office:automatic-styles>
+ <office:master-styles>
+  <style:master-page style:name="Standard" style:page-layout-name="pm1"/>
+ </office:master-styles>
+ <office:body>
+  <office:text>
+   <text:sequence-decls>
+    <text:sequence-decl text:display-outline-level="0" text:name="Illustration"/>
+    <text:sequence-decl text:display-outline-level="0" text:name="Table"/>
+    <text:sequence-decl text:display-outline-level="0" text:name="Text"/>
+    <text:sequence-decl text:display-outline-level="0" text:name="Drawing"/>
+    <text:sequence-decl text:display-outline-level="0" text:name="Figure"/>
+   </text:sequence-decls>
+   <text:p text:style-name="P1">متن فارسی<text:line-break/></text:p>
+  </office:text>
+ </office:body>
+</office:document>
\ No newline at end of file
diff --git a/vcl/qa/cppunit/pdfexport/pdfexport2.cxx b/vcl/qa/cppunit/pdfexport/pdfexport2.cxx
index 390dbc203438..de387cd31850 100644
--- a/vcl/qa/cppunit/pdfexport/pdfexport2.cxx
+++ b/vcl/qa/cppunit/pdfexport/pdfexport2.cxx
@@ -5627,7 +5627,7 @@ CPPUNIT_TEST_FIXTURE(PdfExportTest2, testTdf151748KashidaSpace)
 // tdf#163105 - Writer kashida justification should expand spaces
 CPPUNIT_TEST_FIXTURE(PdfExportTest2, testTdf163105SwKashidaSpaceExpansion)
 {
-    saveAsPDF(u"tdf163105.fodt");
+    saveAsPDF(u"tdf163105-kashida-spaces.fodt");
 
     auto pPdfDocument = parsePDFExport();
     CPPUNIT_ASSERT_EQUAL(1, pPdfDocument->getPageCount());
@@ -5668,6 +5668,99 @@ CPPUNIT_TEST_FIXTURE(PdfExportTest2, testTdf163105SwKashidaSpaceExpansion)
     CPPUNIT_ASSERT_GREATER(150.0, aRect.at(2).getWidth());
 }
 
+// tdf#163105 - Writer should use font information when choosing kashida positions
+CPPUNIT_TEST_FIXTURE(PdfExportTest2, testTdf163105Writer)
+{
+    saveAsPDF(u"tdf163105-writer.fodt");
+
+    auto pPdfDocument = parsePDFExport();
+    CPPUNIT_ASSERT_EQUAL(1, pPdfDocument->getPageCount());
+
+    auto pPdfPage = pPdfDocument->openPage(/*nIndex*/ 0);
+    CPPUNIT_ASSERT(pPdfPage);
+    auto pTextPage = pPdfPage->getTextPage();
+    CPPUNIT_ASSERT(pTextPage);
+
+    int nPageObjectCount = pPdfPage->getObjectCount();
+
+    // The fix allows kashida justification in this document.
+    // Without the fix, this will be 1.
+    CPPUNIT_ASSERT_EQUAL(5, nPageObjectCount);
+
+    std::vector<OUString> aText;
+    std::vector<basegfx::B2DRectangle> aRect;
+
+    int nTextObjectCount = 0;
+    for (int i = 0; i < nPageObjectCount; ++i)
+    {
+        auto pPageObject = pPdfPage->getObject(i);
+        CPPUNIT_ASSERT_MESSAGE("no object", pPageObject != nullptr);
+        if (pPageObject->getType() == vcl::pdf::PDFPageObjectType::Text)
+        {
+            aText.push_back(pPageObject->getText(pTextPage));
+            aRect.push_back(pPageObject->getBounds());
+            ++nTextObjectCount;
+        }
+    }
+
+    CPPUNIT_ASSERT_EQUAL(5, nTextObjectCount);
+
+    CPPUNIT_ASSERT_EQUAL(u"ارسی"_ustr, aText.at(0).trim());
+    CPPUNIT_ASSERT_EQUAL(u""_ustr, aText.at(1).trim());
+    CPPUNIT_ASSERT_EQUAL(u"تن ف"_ustr, aText.at(2).trim()); // This span is whitespace justified
+    CPPUNIT_ASSERT_EQUAL(u""_ustr, aText.at(3).trim());
+    CPPUNIT_ASSERT_EQUAL(u"م"_ustr, aText.at(4).trim());
+
+    // Without the fix, this will be greater than X
+    CPPUNIT_ASSERT_LESS(170.0, aRect.at(2).getWidth());
+}
+
+// tdf#163105 - Edit Engine should use font information when choosing kashida positions
+CPPUNIT_TEST_FIXTURE(PdfExportTest2, testTdf163105Editeng)
+{
+    saveAsPDF(u"tdf163105-editeng.fodt");
+
+    auto pPdfDocument = parsePDFExport();
+    CPPUNIT_ASSERT_EQUAL(1, pPdfDocument->getPageCount());
+
+    auto pPdfPage = pPdfDocument->openPage(/*nIndex*/ 0);
+    CPPUNIT_ASSERT(pPdfPage);
+    auto pTextPage = pPdfPage->getTextPage();
+    CPPUNIT_ASSERT(pTextPage);
+
+    int nPageObjectCount = pPdfPage->getObjectCount();
+
+    // The fix allows kashida justification in this document.
+    // Without the fix, this will be 1.
+    CPPUNIT_ASSERT_EQUAL(5, nPageObjectCount);
+
+    std::vector<OUString> aText;
+    std::vector<basegfx::B2DRectangle> aRect;
+
+    int nTextObjectCount = 0;
+    for (int i = 0; i < nPageObjectCount; ++i)
+    {
+        auto pPageObject = pPdfPage->getObject(i);
+        CPPUNIT_ASSERT_MESSAGE("no object", pPageObject != nullptr);
+        if (pPageObject->getType() == vcl::pdf::PDFPageObjectType::Text)
+        {
+            aText.push_back(pPageObject->getText(pTextPage));
+            aRect.push_back(pPageObject->getBounds());
+            ++nTextObjectCount;
+        }
+    }
+
+    CPPUNIT_ASSERT_EQUAL(5, nTextObjectCount);
+
+    CPPUNIT_ASSERT_EQUAL(u"ارسی"_ustr, aText.at(0).trim());
+    CPPUNIT_ASSERT_EQUAL(u""_ustr, aText.at(1).trim());
+    CPPUNIT_ASSERT_EQUAL(u"تن ف"_ustr, aText.at(2).trim()); // This span is whitespace justified
+    CPPUNIT_ASSERT_EQUAL(u""_ustr, aText.at(3).trim());
+    CPPUNIT_ASSERT_EQUAL(u"م"_ustr, aText.at(4).trim());
+
+    CPPUNIT_ASSERT_LESS(170.0, aRect.at(2).getWidth());
+}
+
 } // end anonymous namespace
 
 CPPUNIT_PLUGIN_IMPLEMENT();