[Libreoffice-commits] .: basegfx/source basegfx/test

[Kohei Yoshida]

 basegfx/source/matrix/b2dhommatrix.cxx |    8 ++++++++
 basegfx/test/basegfx2d.cxx             |   17 +++++++++++++++++
 2 files changed, 25 insertions(+)

New commits:
commit 800806ba850c7fd03e37acb011fa993e08cb8fc8
Author: Thorsten Behrens <tbehrens at suse.com>
Date:   Wed Jan 18 14:52:20 2012 -0500

    decompose() should return the original rotation angle and scales.
    
    decompose() would return incorrect rotation angle and scales when the
    angle was exactly 180 degrees, due to FPU rounding error.  This commit
    fixes it.
    
    This problem would manifest itself when inserting an image into
    Calc/Draw, cropping it, and flipping it vertically or rotating it
    at exactly 180 degrees.  Before the fix the image would simply disappear.

diff --git a/basegfx/source/matrix/b2dhommatrix.cxx b/basegfx/source/matrix/b2dhommatrix.cxx
index 942f313..8538d22 100644
--- a/basegfx/source/matrix/b2dhommatrix.cxx
+++ b/basegfx/source/matrix/b2dhommatrix.cxx
@@ -289,6 +289,14 @@ namespace basegfx
             // no rotation and shear, copy scale values
             rScale.setX(get(0, 0));
             rScale.setY(get(1, 1));
+
+            // or is there?
+            if( rScale.getX() < 0 && rScale.getY() < 0 )
+            {
+                // there is - 180 degree rotated
+                rScale *= -1;
+                rRotate = 180*F_PI180;
+            }
         }
         else
         {
diff --git a/basegfx/test/basegfx2d.cxx b/basegfx/test/basegfx2d.cxx
index 65f778f..0f0c9c7 100644
--- a/basegfx/test/basegfx2d.cxx
+++ b/basegfx/test/basegfx2d.cxx
@@ -36,6 +36,7 @@
 #include "cppunit/extensions/HelperMacros.h"
 
 #include <basegfx/matrix/b2dhommatrix.hxx>
+#include <basegfx/matrix/b2dhommatrixtools.hxx>
 #include <basegfx/polygon/b2dpolygon.hxx>
 #include <basegfx/polygon/b2dpolygontools.hxx>
 #include <basegfx/curve/b2dcubicbezier.hxx>
@@ -666,6 +667,22 @@ public:
         CPPUNIT_ASSERT_MESSAGE("decompose: error test I2", impDecomposeComposeTest(-fSX, fSY, tan(-fS), -fR));
         CPPUNIT_ASSERT_MESSAGE("decompose: error test I3", impDecomposeComposeTest(fSX, -fSY, tan(-fS), -fR));
         CPPUNIT_ASSERT_MESSAGE("decompose: error test I4", impDecomposeComposeTest(-fSX, -fSY, tan(-fS), -fR));
+
+        // cover special case of 180 degree rotation
+        B2DHomMatrix aTest=tools::createScaleShearXRotateTranslateB2DHomMatrix(
+            6425,3938,
+            0,
+            180*F_PI180,
+            10482,4921);
+        // decompose that matrix
+        B2DTuple aDScale;
+        B2DTuple aDTrans;
+        double fDRot;
+        double fDShX;
+        aTest.decompose(aDScale, aDTrans, fDRot, fDShX);
+        CPPUNIT_ASSERT_MESSAGE("decompose: error test J1", aDScale.getX() == 6425 && aDScale.getY() == 3938);
+        CPPUNIT_ASSERT_MESSAGE("decompose: error test J1", aDTrans.getX() == 10482 && aDTrans.getY() == 4921);
+        CPPUNIT_ASSERT_MESSAGE("decompose: error test J1", fDRot == 180*F_PI180);
     }
 
     // Change the following lines only, if you add, remove or rename