tdf#142261 EMF+ Add support for Miter Limit

With this commit the Miter is properly implemented,
according to [EMF-PLUS] documentation:
https://docs.microsoft.com/en-us/openspecs/windows_protocols/ms-emfplus/5ef071f3-f503-4f16-b027-7c4bcf2d1d81

The formula for stroke miter limit is described here:
https://developer.mozilla.org/en-US/docs/Web/SVG/Attribute/stroke-miterlimit

Change-Id: Ida87063cc045460e61ffae118f64cf133c810dbf
Reviewed-on: https://gerrit.libreoffice.org/c/core/+/134164
Tested-by: Jenkins
Reviewed-by: Bartosz Kosiorek <gang65@poczta.onet.pl>

2 files changed, 50 insertions, 0 deletions

diff --git a/emfio/qa/cppunit/emf/EmfImportTest.cxx b/emfio/qa/cppunit/emf/EmfImportTest.cxx
index f83688745e02..6c5e77bb67dd 100644
--- a/emfio/qa/cppunit/emf/EmfImportTest.cxx
+++ b/emfio/qa/cppunit/emf/EmfImportTest.cxx
@@ -67,6 +67,7 @@ class Test : public test::BootstrapFixture, public XmlTestTools, public unotest:
     void TestFillRegion();
     void TestEmfPlusGetDC();
     void TestEmfPlusSave();
+    void TestEmfPlusDrawPathWithMiterLimit();
     void TestExtTextOutOpaqueAndClipTransform();
 
     void TestBitBltStretchBltWMF();
@@ -115,6 +116,7 @@ public:
     CPPUNIT_TEST(TestFillRegion);
     CPPUNIT_TEST(TestEmfPlusGetDC);
     CPPUNIT_TEST(TestEmfPlusSave);
+    CPPUNIT_TEST(TestEmfPlusDrawPathWithMiterLimit);
     CPPUNIT_TEST(TestExtTextOutOpaqueAndClipTransform);
 
     CPPUNIT_TEST(TestBitBltStretchBltWMF);
@@ -1019,6 +1021,54 @@ void Test::TestEmfPlusSave()
                        "12832.6557236512,4907.54325697157");
 }
 
+void Test::TestEmfPlusDrawPathWithMiterLimit()
+{
+    // tdf#142261 EMF+ records: DrawPath, TranslateWorldTransform, Object (Brush, Pen, Path)
+    // Check if Miter is correctly set for Lines
+    Primitive2DSequence aSequence
+        = parseEmf(u"emfio/qa/cppunit/emf/data/TestEmfPlusDrawPathWithMiterLimit.emf");
+    CPPUNIT_ASSERT_EQUAL(1, static_cast<int>(aSequence.getLength()));
+    drawinglayer::Primitive2dXmlDump dumper;
+    xmlDocUniquePtr pDocument = dumper.dumpAndParse(Primitive2DContainer(aSequence));
+    CPPUNIT_ASSERT(pDocument);
+
+    assertXPath(pDocument, aXPathPrefix + "polypolygonstroke", 3);
+    assertXPath(pDocument, aXPathPrefix + "polypolygonstroke[1]/line", "color", "#c800c8");
+    assertXPath(pDocument, aXPathPrefix + "polypolygonstroke[1]/line", "width", "1057");
+    assertXPath(pDocument, aXPathPrefix + "polypolygonstroke[1]/line", "linejoin", "Miter");
+    assertXPath(pDocument, aXPathPrefix + "polypolygonstroke[1]/line", "miterangle", "5");
+    assertXPath(pDocument, aXPathPrefix + "polypolygonstroke[1]/stroke", 0);
+
+    assertXPath(pDocument, aXPathPrefix + "unifiedtransparence", 3);
+    assertXPath(pDocument, aXPathPrefix + "unifiedtransparence[1]", "transparence", "85");
+    assertXPath(pDocument, aXPathPrefix + "unifiedtransparence[1]/polypolygonstroke/line", "color",
+                "#6400c8");
+    assertXPath(pDocument, aXPathPrefix + "unifiedtransparence[1]/polypolygonstroke/line", "width",
+                "1057");
+    assertXPath(pDocument, aXPathPrefix + "unifiedtransparence[1]/polypolygonstroke/line",
+                "linejoin", "Miter");
+    assertXPath(pDocument, aXPathPrefix + "unifiedtransparence[1]/polypolygonstroke/line",
+                "miterangle", "19");
+    assertXPath(pDocument, aXPathPrefix + "unifiedtransparence[2]", "transparence", "69");
+    assertXPath(pDocument, aXPathPrefix + "unifiedtransparence[2]/polypolygonstroke/line",
+                "miterangle", "19");
+    assertXPath(pDocument, aXPathPrefix + "unifiedtransparence[3]", "transparence", "53");
+    assertXPath(pDocument, aXPathPrefix + "unifiedtransparence[3]/polypolygonstroke/line",
+                "miterangle", "19");
+
+    assertXPath(pDocument, aXPathPrefix + "polypolygonstroke[2]/line", "color", "#0000ff");
+    assertXPath(pDocument, aXPathPrefix + "polypolygonstroke[2]/line", "width", "1057");
+    assertXPath(pDocument, aXPathPrefix + "polypolygonstroke[2]/line", "linejoin", "Miter");
+    assertXPath(pDocument, aXPathPrefix + "polypolygonstroke[2]/line", "miterangle", "60");
+    assertXPath(pDocument, aXPathPrefix + "polypolygonstroke[2]/stroke", 0);
+
+    assertXPath(pDocument, aXPathPrefix + "polypolygonstroke[3]/line", "color", "#0000ff");
+    assertXPath(pDocument, aXPathPrefix + "polypolygonstroke[3]/line", "width", "1057");
+    assertXPath(pDocument, aXPathPrefix + "polypolygonstroke[3]/line", "linejoin", "Miter");
+    assertXPath(pDocument, aXPathPrefix + "polypolygonstroke[3]/line", "miterangle", "60");
+    assertXPath(pDocument, aXPathPrefix + "polypolygonstroke[3]/stroke", 0);
+}
+
 void Test::TestExtTextOutOpaqueAndClipTransform()
 {
     // tdf#142495 EMF records: SETBKCOLOR, SELECTOBJECT, EXTTEXTOUTW, MODIFYWORLDTRANSFORM, CREATEFONTINDIRECT.
diff --git a/emfio/qa/cppunit/emf/data/TestEmfPlusDrawPathWithMiterLimit.emf b/emfio/qa/cppunit/emf/data/TestEmfPlusDrawPathWithMiterLimit.emf
new file mode 100644
index 000000000000..e8e46486384b
--- /dev/null
+++ b/emfio/qa/cppunit/emf/data/TestEmfPlusDrawPathWithMiterLimit.emf