tdf#152048: Fix underline width for Kashida-justified text

Fix GenericSalLayout::GetTextWidth() again, this time doing away with
using linearPos as it is wrong, the glyph’s position is not directly
related to how much it contributes to the text width (for example,
combining marks have zero advance width yet their position is different
from the base glyph they apply too). This is a followup to:

commit ce7c1c608fa99c86c8f2380cd8b82d02123f514e
Author: Khaled Hosny <khaled@aliftype.com>
Date:   Wed Aug 31 07:07:54 2022 +0200

vcl: Fix GenericSalLayout::GetTextWidth()

Additionally, inserted Kashida should have its origWidth and newWidth
both set to zero, since it does not add to the text width, all
additional width is already added to the glyph the Kashida is applied
to.

With both fixes, the text width of Kashida-justified lines is correctly
calculated and the underline no longer extends beyond the text line.

Fix test expectation now we are reporting the real text width.

Change-Id: I0de93f955929cf3030cf420cb4f4e94df974fb79
Reviewed-on: https://gerrit.libreoffice.org/c/core/+/152267
Tested-by: Jenkins
Reviewed-by: خالد حسني <khaled@libreoffice.org>
(cherry picked from commit 43a5400063b17ed4ba4cbb38bdf5da4a991f60e2)
Reviewed-on: https://gerrit.libreoffice.org/c/core/+/152220
Reviewed-by: Caolán McNamara <caolan.mcnamara@collabora.com>

3 files changed, 7 insertions, 16 deletions

diff --git a/vcl/qa/cppunit/pdfexport/pdfexport.cxx b/vcl/qa/cppunit/pdfexport/pdfexport.cxx
index a7a02272219d..60ea081ed423 100644
--- a/vcl/qa/cppunit/pdfexport/pdfexport.cxx
+++ b/vcl/qa/cppunit/pdfexport/pdfexport.cxx
@@ -774,15 +774,15 @@ CPPUNIT_TEST_FIXTURE(PdfExportTest, testTdf108963)
             pSegment = pPdfPageObject->getPathSegment(1);
             CPPUNIT_ASSERT_EQUAL(vcl::pdf::PDFSegmentType::Lineto, pSegment->getType());
             aPoint = pSegment->getPoint();
-            CPPUNIT_ASSERT_DOUBLES_EQUAL(275.074, aPoint.getX(), 0.0005);
-            CPPUNIT_ASSERT_DOUBLES_EQUAL(267.590, aPoint.getY(), 0.0005);
+            CPPUNIT_ASSERT_DOUBLES_EQUAL(275.216, aPoint.getX(), 0.0005);
+            CPPUNIT_ASSERT_DOUBLES_EQUAL(267.732, aPoint.getY(), 0.0005);
             CPPUNIT_ASSERT(!pSegment->isClosed());
 
             pSegment = pPdfPageObject->getPathSegment(2);
             CPPUNIT_ASSERT_EQUAL(vcl::pdf::PDFSegmentType::Lineto, pSegment->getType());
             aPoint = pSegment->getPoint();
-            CPPUNIT_ASSERT_DOUBLES_EQUAL(287.490, aPoint.getX(), 0.0005);
-            CPPUNIT_ASSERT_DOUBLES_EQUAL(251.801, aPoint.getY(), 0.0005);
+            CPPUNIT_ASSERT_DOUBLES_EQUAL(287.660, aPoint.getX(), 0.0005);
+            CPPUNIT_ASSERT_DOUBLES_EQUAL(251.914, aPoint.getY(), 0.0005);
             CPPUNIT_ASSERT(!pSegment->isClosed());
 
             pSegment = pPdfPageObject->getPathSegment(3);
diff --git a/vcl/source/gdi/CommonSalLayout.cxx b/vcl/source/gdi/CommonSalLayout.cxx
index f4472726fcfe..5cac0ebdb6b0 100644
--- a/vcl/source/gdi/CommonSalLayout.cxx
+++ b/vcl/source/gdi/CommonSalLayout.cxx
@@ -845,7 +845,7 @@ void GenericSalLayout::ApplyDXArray(const double* pDXArray, const sal_Bool* pKas
         aPos.adjustX(-nClusterWidth + pGlyphIter->origWidth());
         while (nCopies--)
         {
-            GlyphItem aKashida(nCharPos, 0, nKashidaIndex, aPos, nFlags, nKashidaWidth, 0, 0);
+            GlyphItem aKashida(nCharPos, 0, nKashidaIndex, aPos, nFlags, 0, 0, 0);
             pGlyphIter = m_GlyphItems.insert(pGlyphIter, aKashida);
             aPos.adjustX(nKashidaWidth - nOverlap);
             ++pGlyphIter;
diff --git a/vcl/source/gdi/sallayout.cxx b/vcl/source/gdi/sallayout.cxx
index 85ad838615d9..1ed2a37ad71b 100644
--- a/vcl/source/gdi/sallayout.cxx
+++ b/vcl/source/gdi/sallayout.cxx
@@ -269,19 +269,10 @@ DeviceCoordinate GenericSalLayout::GetTextWidth() const
     if (!m_GlyphItems.IsValid())
         return 0;
 
-    // initialize the extent
-    DeviceCoordinate nMinPos = 0;
-    DeviceCoordinate nMaxPos = 0;
-
+    DeviceCoordinate nWidth = 0;
     for (auto const& aGlyphItem : m_GlyphItems)
-    {
-        // update the text extent with the glyph extent
-        DeviceCoordinate nXPos = aGlyphItem.linearPos().getX() - aGlyphItem.xOffset();
-        nMinPos = std::min(nMinPos, nXPos);
-        nMaxPos = std::max(nMaxPos, nXPos + aGlyphItem.newWidth());
-    }
+        nWidth += aGlyphItem.newWidth();
 
-    DeviceCoordinate nWidth = nMaxPos - nMinPos;
     return nWidth;
 }