Fix for SVG animate-transform when additive = "replace".

On animate transform if additive = "replace" then transform specified
with the element should be replaced with value of animateTransform. If
additive = "sum" , then apply the animateTransform on top of element
level transform.

Reviewed-by: Kim

3 files changed, 99 insertions, 19 deletions

diff --git a/src/svg/qsvghandler.cpp b/src/svg/qsvghandler.cpp
index a79e4a0..2d07a1e 100644
--- a/src/svg/qsvghandler.cpp
+++ b/src/svg/qsvghandler.cpp
@@ -2025,6 +2025,7 @@ static bool parseAnimateTransformNode(QSvgNode *parent,
     QString fillStr    = attributes.value(QLatin1String("fill")).toString();
     QString fromStr    = attributes.value(QLatin1String("from")).toString();
     QString toStr      = attributes.value(QLatin1String("to")).toString();
+    QString addtv      = attributes.value(QLatin1String("additive")).toString();
 
     QVector<qreal> vals;
     if (values.isEmpty()) {
@@ -2087,8 +2088,11 @@ static bool parseAnimateTransformNode(QSvgNode *parent,
         return false;
     }
 
+    QSvgAnimateTransform::Additive additive = QSvgAnimateTransform::Replace;
+    if (addtv == QLatin1String("sum"))
+        additive = QSvgAnimateTransform::Sum;
     QSvgAnimateTransform *anim = new QSvgAnimateTransform(begin, end, 0);
-    anim->setArgs(type, vals);
+    anim->setArgs(type, additive, vals);
     anim->setFreeze(fillStr == QLatin1String("freeze"));
     anim->setRepeatCount(
             (repeatStr == QLatin1String("indefinite"))? -1 :
diff --git a/src/svg/qsvgstyle.cpp b/src/svg/qsvgstyle.cpp
index 1ecf870..85d257f 100644
--- a/src/svg/qsvgstyle.cpp
+++ b/src/svg/qsvgstyle.cpp
@@ -509,10 +509,36 @@ void QSvgStyle::apply(QPainter *p, const QRectF &rect, QSvgNode *node, QSvgExtra
     //animated transforms have to be applied
     //_after_ the original object transformations
     if (!animateTransforms.isEmpty()) {
-        QList<QSvgRefCounter<QSvgAnimateTransform> >::const_iterator itr;
-        for (itr = animateTransforms.constBegin(); itr != animateTransforms.constEnd();
-             ++itr) {
-            (*itr)->apply(p, rect, node, states);
+        QList<QSvgRefCounter<QSvgAnimateTransform> >::const_iterator itr, temp, replace;
+        bool replaced = false;
+        qreal totalTimeElapsed = 0;
+        for (itr = animateTransforms.constBegin(); itr!= animateTransforms.constEnd(); ++itr) {
+            totalTimeElapsed = node->document()->currentElapsed();
+            if ((totalTimeElapsed >= (*itr)->animStartTime()) && (!(*itr)->animFinished(totalTimeElapsed) || (*itr)->frozen())) {
+                if ((*itr)->additiveType() == QSvgAnimateTransform::Replace) {
+                    if (!replaced) {
+                        //set the flag to show replace is already encountered
+                        //store the itr, which can be used if we encounter other animateTransform with additive = "replace"
+                        replaced = true;
+                        replace = itr;
+                        //revert the first animateTransform with additive = "sum"
+                        temp = animateTransforms.constBegin();
+                        if (temp != itr)
+                            (*temp)->revert(p, states);
+
+                        //revert the transform if already applied
+                        if (transform)
+                            transform->revert(p, states);
+                    } else {
+                        //if animateTransform with additive = "replace" is encountered already
+                        //then just revert that old animateTransform
+                        (*replace)->revert(p,states);
+                        replace = itr; //store the latest replace transform
+                    }
+                }
+                (*itr)->apply(p, rect, node, states);
+                (*itr)->setTransformApplied(true);
+            }
         }
     }
 
@@ -559,11 +585,23 @@ void QSvgStyle::revert(QPainter *p, QSvgExtraStates &states)
     //the native transforms
     if (!animateTransforms.isEmpty()) {
         QList<QSvgRefCounter<QSvgAnimateTransform> >::const_iterator itr;
-        itr = animateTransforms.constBegin();
-        //only need to rever the first one because that
-        //one has the original world matrix for the primitve
-        if (itr != animateTransforms.constEnd()) {
-            (*itr)->revert(p, states);
+        bool reverted = false;
+        for (itr = animateTransforms.constEnd(); itr != animateTransforms.constBegin(); --itr) {
+            //if there is an animate transform with additive = "replace"
+            //then revert the last applied animateTransform with additive = "replace"
+            if (((*(itr-1))->transformApplied()) && ((*(itr-1))->additiveType() == QSvgAnimateTransform::Replace)) {
+                reverted = true;
+                (*(itr-1))->revert(p,states);
+                break;
+            }
+        }
+        //if there are no animateTransform with additive = "replace" then
+        //revert the first applied animateTransform with additive = "sum"
+        if (!reverted) {
+            while (itr != animateTransforms.constEnd() && !(*itr)->transformApplied())
+                itr++;
+            if (itr != animateTransforms.constEnd())
+                (*itr)->revert(p, states);
         }
     }
 
@@ -587,15 +625,16 @@ void QSvgStyle::revert(QPainter *p, QSvgExtraStates &states)
 QSvgAnimateTransform::QSvgAnimateTransform(int startMs, int endMs, int byMs )
     : QSvgStyleProperty(),
       m_from(startMs), m_to(endMs), m_by(byMs),
-      m_type(Empty), m_count(0), m_finished(false)
+      m_type(Empty), m_count(0), m_finished(false), m_additive(Replace), m_transformApplied(false)
 {
     m_totalRunningTime = m_to - m_from;
 }
 
-void QSvgAnimateTransform::setArgs(TransformType type, const QVector<qreal> &args)
+void QSvgAnimateTransform::setArgs(TransformType type, Additive additive, const QVector<qreal> &args)
 {
     m_type = type;
     m_args = args;
+    m_additive = additive;
     Q_ASSERT(!(args.count()%3));
     m_count = args.count() / 3;
 }
@@ -604,15 +643,12 @@ void QSvgAnimateTransform::apply(QPainter *p, const QRectF &, QSvgNode *node, QS
 {
     m_oldWorldTransform = p->worldTransform();
     resolveMatrix(node);
-    if (!m_finished || m_freeze)
-        p->setWorldTransform(m_transform, true);
+    p->setWorldTransform(m_transform, true);
 }
 
 void QSvgAnimateTransform::revert(QPainter *p, QSvgExtraStates &)
 {
-    if (!m_finished || m_freeze) {
-        p->setWorldTransform(m_oldWorldTransform, false /* don't combine */);
-    }
+    p->setWorldTransform(m_oldWorldTransform, false /* don't combine */);
 }
 
 void QSvgAnimateTransform::resolveMatrix(QSvgNode *node)
diff --git a/src/svg/qsvgstyle_p.h b/src/svg/qsvgstyle_p.h
index c18a265..6f56574 100644
--- a/src/svg/qsvgstyle_p.h
+++ b/src/svg/qsvgstyle_p.h
@@ -250,7 +250,7 @@ public:
     {
         return m_style;
     }
-	
+
     void setGradientId(const QString &Id)
     {
         m_gradientId = Id;
@@ -529,20 +529,59 @@ public:
         SkewX,
         SkewY
     };
+    enum Additive
+    {
+        Sum,
+        Replace
+    };
 public:
     QSvgAnimateTransform(int startMs, int endMs, int by = 0);
-    void setArgs(TransformType type, const QVector<qreal> &args);
+    void setArgs(TransformType type, Additive additive, const QVector<qreal> &args);
     void setFreeze(bool freeze);
     void setRepeatCount(qreal repeatCount);
     virtual void apply(QPainter *p, const QRectF &, QSvgNode *node, QSvgExtraStates &states);
     virtual void revert(QPainter *p, QSvgExtraStates &states);
     virtual Type type() const;
+    QSvgAnimateTransform::Additive additiveType() const
+    {
+        return m_additive;
+    }
+
+    bool animFinished(qreal totalTimeElapsed)
+    {
+        qreal animationFrame = (totalTimeElapsed - m_from) / m_to;
+        if (m_repeatCount >= 0 && m_repeatCount < animationFrame)
+            return true;
+        return false;
+    }
+
+    qreal animStartTime() const
+    {
+        return m_from;
+    }
+
+    void setTransformApplied(bool apply)
+    {
+        m_transformApplied = apply;
+    }
+
+    bool transformApplied() const
+    {
+        return m_transformApplied;
+    }
+
+    bool frozen()
+    {
+        return m_freeze;
+    }
+
 protected:
     void resolveMatrix(QSvgNode *node);
 private:
     qreal m_from, m_to, m_by;
     qreal m_totalRunningTime;
     TransformType m_type;
+    Additive m_additive;
     QVector<qreal> m_args;
     int m_count;
     QTransform m_transform;
@@ -550,6 +589,7 @@ private:
     bool m_finished;
     bool m_freeze;
     qreal m_repeatCount;
+    bool m_transformApplied;
 };