From 4913076ee996e6b2eab29ad79aee8682955cdcaa Mon Sep 17 00:00:00 2001
From: Pino Toscano <pino@kde.org>
Date: Mon, 3 Sep 2007 18:16:27 +0000
Subject: [PATCH] extract in an own static function te calculation of a
 rotation matrix from both source and destination rotations

svn path=/trunk/KDE/kdegraphics/okular/; revision=708049
---
 core/rotationjob.cpp | 41 ++++++++++++++++++++++++-----------------
 core/rotationjob_p.h |  3 +++
 2 files changed, 27 insertions(+), 17 deletions(-)

diff --git a/core/rotationjob.cpp b/core/rotationjob.cpp
index 3e8a443b7..625a5d2cc 100644
--- a/core/rotationjob.cpp
+++ b/core/rotationjob.cpp
@@ -50,39 +50,46 @@ void RotationJob::run()
         return;
     }
 
+    QMatrix matrix = rotationMatrix( mOldRotation, mNewRotation );
+
+    mRotatedImage = mImage.transformed( matrix );
+}
+
+QMatrix RotationJob::rotationMatrix( Rotation from, Rotation to )
+{
     QMatrix matrix;
 
-    if ( mOldRotation == Rotation0 ) {
-        if ( mNewRotation == Rotation90 )
+    if ( from == Rotation0 ) {
+        if ( to == Rotation90 )
             matrix.rotate( 90 );
-        else if ( mNewRotation == Rotation180 )
+        else if ( to == Rotation180 )
             matrix.rotate( 180 );
-        else if ( mNewRotation == Rotation270 )
+        else if ( to == Rotation270 )
             matrix.rotate( 270 );
-    } else if ( mOldRotation == Rotation90 ) {
-        if ( mNewRotation == Rotation180 )
+    } else if ( from == Rotation90 ) {
+        if ( to == Rotation180 )
             matrix.rotate( 90 );
-        else if ( mNewRotation == Rotation270 )
+        else if ( to == Rotation270 )
             matrix.rotate( 180 );
-        else if ( mNewRotation == Rotation0 )
+        else if ( to == Rotation0 )
             matrix.rotate( 270 );
-    } else if ( mOldRotation == Rotation180 ) {
-        if ( mNewRotation == Rotation270 )
+    } else if ( from == Rotation180 ) {
+        if ( to == Rotation270 )
             matrix.rotate( 90 );
-        else if ( mNewRotation == Rotation0 )
+        else if ( to == Rotation0 )
             matrix.rotate( 180 );
-        else if ( mNewRotation == Rotation90 )
+        else if ( to == Rotation90 )
             matrix.rotate( 270 );
-    } else if ( mOldRotation == Rotation270 ) {
-        if ( mNewRotation == Rotation0 )
+    } else if ( from == Rotation270 ) {
+        if ( to == Rotation0 )
             matrix.rotate( 90 );
-        else if ( mNewRotation == Rotation90 )
+        else if ( to == Rotation90 )
             matrix.rotate( 180 );
-        else if ( mNewRotation == Rotation180 )
+        else if ( to == Rotation180 )
             matrix.rotate( 270 );
     }
 
-    mRotatedImage = mImage.transformed( matrix );
+    return matrix;
 }
 
 #include "rotationjob_p.moc"
diff --git a/core/rotationjob_p.h b/core/rotationjob_p.h
index 5aaff0182..9790b64b5 100644
--- a/core/rotationjob_p.h
+++ b/core/rotationjob_p.h
@@ -11,6 +11,7 @@
 #define _OKULAR_ROTATIONJOB_P_H_
 
 #include <QtGui/QImage>
+#include <QtGui/QMatrix>
 
 #include <threadweaver/Job.h>
 
@@ -34,6 +35,8 @@ class RotationJob : public ThreadWeaver::Job
         int id() const;
         PagePrivate * page() const;
 
+        static QMatrix rotationMatrix( Rotation from, Rotation to );
+
     protected:
         virtual void run();