tdf#106084 EMF+ Add support for EmfPlusTranslateWorldTransform record

The EmfPlusTranslateWorldTransform record performs a translation
on the current world space transform.

Change-Id: I3e5744060c8a6d758bcc2804c6798e0208d2191f
Reviewed-on: https://gerrit.libreoffice.org/36287
Tested-by: Jenkins <ci@libreoffice.org>
Reviewed-by: Bartosz Kosiorek <gang65@poczta.onet.pl>

2 files changed, 49 insertions, 11 deletions

diff --git a/cppcanvas/source/inc/implrenderer.hxx b/cppcanvas/source/inc/implrenderer.hxx
index 0b584fad9a85..033882d15620 100644
--- a/cppcanvas/source/inc/implrenderer.hxx
+++ b/cppcanvas/source/inc/implrenderer.hxx
@@ -76,19 +76,26 @@ namespace cppcanvas
         };
 
         // EMF+
-        // TODO: replace?
+        // Transformation matrix (used for Affine Transformation)
+        //      [ eM11, eM12, eDx ]
+        //      [ eM21, eM22, eDy ]
+        //      [ 0,    0,    1   ]
+        // that consists of a linear map (eM11, eM12, eM21, eM22)
+        // More info: https://en.wikipedia.org/wiki/Linear_map
+        // followed by a translation (eDx, eDy)
+
         struct XForm
         {
-            float   eM11;
-            float   eM12;
-            float   eM21;
-            float   eM22;
-            float   eDx;
-            float   eDy;
+            float   eM11; // M1,1 value in the matrix. Increases or decreases the size of the pixels horizontally.
+            float   eM12; // M1,2 value in the matrix. This effectively angles the X axis up or down.
+            float   eM21; // M2,1 value in the matrix. This effectively angles the Y axis left or right.
+            float   eM22; // M2,2 value in the matrix. Increases or decreases the size of the pixels vertically.
+            float   eDx;  // Delta x (Dx) value in the matrix. Moves the whole coordinate system horizontally.
+            float   eDy;  // Delta y (Dy) value in the matrix. Moves the whole coordinate system vertically.
             XForm()
             {
                 SetIdentity ();
-            };
+            }
 
             void SetIdentity ()
             {
@@ -106,14 +113,20 @@ namespace cppcanvas
                 eDy  = f.eDy;
             }
 
+            // Multiple two square matrices
+            //      [ eM11, eM12, eDx ]   [ f.eM11, f.eM12, f.eDx ]
+            //      [ eM21, eM22, eDy ] x [ f.eM21, f.eM22, f.eDy ]
+            //      [ 0,    0,    1   ]   [ 0,      0,      1     ]
+            // More information: https://en.wikipedia.org/wiki/Matrix_multiplication#Square_matrices
+            // FIXME We shouldn't modify source matrix during computation
             void Multiply (const XForm& f)
             {
                 eM11 = eM11*f.eM11 + eM12*f.eM21;
                 eM12 = eM11*f.eM12 + eM12*f.eM22;
                 eM21 = eM21*f.eM11 + eM22*f.eM21;
                 eM22 = eM21*f.eM12 + eM22*f.eM22;
-                eDx *= eDx*f.eM11  + eDy*f.eM21 + f.eDx;
-                eDy *= eDx*f.eM12  + eDy*f.eM22 + f.eDy;
+                eDx  = eDx*f.eM11  + eDy*f.eM21 + f.eDx;
+                eDy  = eDx*f.eM12  + eDy*f.eM22 + f.eDy;
             }
 
 #ifdef OSL_BIGENDIAN
diff --git a/cppcanvas/source/mtfrenderer/emfplus.cxx b/cppcanvas/source/mtfrenderer/emfplus.cxx
index 618eddfa7915..97f3a59928f3 100644
--- a/cppcanvas/source/mtfrenderer/emfplus.cxx
+++ b/cppcanvas/source/mtfrenderer/emfplus.cxx
@@ -102,7 +102,7 @@ namespace
 #define EmfPlusRecordTypeSetWorldTransform 0x402A
 #define EmfPlusRecordTypeResetWorldTransform 0x402B
 #define EmfPlusRecordTypeMultiplyWorldTransform 0x402C
-//TODO EmfPlusRecordTypeTranslateWorldTransform 0x402D
+#define EmfPlusRecordTypeTranslateWorldTransform 0x402D
 //TODO EmfPlusRecordTypeScaleWorldTransform 0x402E
 //TODO EmfPlusRecordTypeRotateWorldTransform 0x402F
 #define EmfPlusRecordTypeSetPageTransform 0x4030
@@ -174,6 +174,7 @@ const char* emfTypeToName(sal_uInt16 type)
         case EmfPlusRecordTypeSetWorldTransform: return "EmfPlusRecordTypeSetWorldTransform";
         case EmfPlusRecordTypeResetWorldTransform: return "EmfPlusRecordTypeResetWorldTransform";
         case EmfPlusRecordTypeMultiplyWorldTransform: return "EmfPlusRecordTypeMultiplyWorldTransform";
+        case EmfPlusRecordTypeTranslateWorldTransform: return "EmfPlusRecordTypeTranslateWorldTransform";
         case EmfPlusRecordTypeSetPageTransform: return "EmfPlusRecordTypeSetPageTransform";
         case EmfPlusRecordTypeSetClipRect: return "EmfPlusRecordTypeSetClipRect";
         case EmfPlusRecordTypeSetClipPath: return "EmfPlusRecordTypeSetClipPath";
@@ -1393,6 +1394,30 @@ namespace cppcanvas
                                 "EMF+\tdx: "  << aWorldTransform.eDx  << "dy: "  << aWorldTransform.eDy);
                         break;
                     }
+                    case EmfPlusRecordTypeTranslateWorldTransform:
+                        {
+                            SAL_INFO("cppcanvas.emf", "EMF+ TranslateWorldTransform");
+
+                            XForm transform = XForm();
+                            rMF.ReadFloat( transform.eDx ).ReadFloat( transform.eDy );
+
+                            SAL_INFO("cppcanvas.emf",
+                                     "EMF+\t m11: " << transform.eM11 << ", m12: " << transform.eM12 <<
+                                     "EMF+\t m21: " << transform.eM21 << ", m22: " << transform.eM22 <<
+                                     "EMF+\t dx: "  << transform.eDx  << ", dy: "  << transform.eDy);
+
+                            if (flags & 0x2000)  // post multiply
+                                aWorldTransform.Multiply (transform);
+                            else {               // pre multiply
+                                transform.Multiply (aWorldTransform);
+                                aWorldTransform.Set (transform);
+                            }
+                            SAL_INFO("cppcanvas.emf",
+                                     "EMF+\t m11: " << aWorldTransform.eM11 << ", m12: " << aWorldTransform.eM12 <<
+                                     "EMF+\t m21: " << aWorldTransform.eM21 << ", m22: " << aWorldTransform.eM22 <<
+                                     "EMF+\t dx: "  << aWorldTransform.eDx  << ", dy: "  << aWorldTransform.eDy);
+                            break;
+                        }
                     case EmfPlusRecordTypeSetClipRect:
                         {
                             int combineMode = (flags >> 8) & 0xf;