1 files changed, 288 insertions, 0 deletions
diff --git a/Source/WebCore/svg/SVGPathBlender.cpp b/Source/WebCore/svg/SVGPathBlender.cpp
new file mode 100644
index 0000000..d46e24a
--- /dev/null
+++ b/Source/WebCore/svg/SVGPathBlender.cpp
@@ -0,0 +1,288 @@
+/*
+ * Copyright (C) Research In Motion Limited 2010. All rights reserved.
+ *
+ * This library is free software; you can redistribute it and/or
+ * modify it under the terms of the GNU Library General Public
+ * License as published by the Free Software Foundation; either
+ * version 2 of the License, or (at your option) any later version.
+ *
+ * This library is distributed in the hope that it will be useful,
+ * but WITHOUT ANY WARRANTY; without even the implied warranty of
+ * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the GNU
+ * Library General Public License for more details.
+ *
+ * You should have received a copy of the GNU Library General Public License
+ * along with this library; see the file COPYING.LIB.  If not, write to
+ * the Free Software Foundation, Inc., 51 Franklin Street, Fifth Floor,
+ * Boston, MA 02110-1301, USA.
+ */
+
+#include "config.h"
+
+#if ENABLE(SVG)
+#include "SVGPathBlender.h"
+
+#include "SVGPathSeg.h"
+
+namespace WebCore {
+
+SVGPathBlender::SVGPathBlender()
+    : m_fromSource(0)
+    , m_toSource(0)
+    , m_consumer(0)
+    , m_progress(0)
+{
+}
+
+float SVGPathBlender::blendAnimatedFloat(float from, float to)
+{
+    return (to - from) * m_progress + from;
+}
+
+FloatPoint SVGPathBlender::blendAnimatedFloatPoint(FloatPoint& from, FloatPoint& to)
+{
+    return FloatPoint((to.x() - from.x()) * m_progress + from.x(), (to.y() - from.y()) * m_progress + from.y());
+}
+
+bool SVGPathBlender::blendMoveToSegment()
+{
+    FloatPoint fromTargetPoint;
+    FloatPoint toTargetPoint;
+    if (!m_fromSource->parseMoveToSegment(fromTargetPoint)
+        || !m_toSource->parseMoveToSegment(toTargetPoint))
+        return false;
+
+    m_consumer->moveTo(blendAnimatedFloatPoint(fromTargetPoint, toTargetPoint), false, m_mode);
+    return true;
+}
+
+bool SVGPathBlender::blendLineToSegment()
+{
+    FloatPoint fromTargetPoint;
+    FloatPoint toTargetPoint;
+    if (!m_fromSource->parseLineToSegment(fromTargetPoint)
+        || !m_toSource->parseLineToSegment(toTargetPoint))
+        return false;
+
+    m_consumer->lineTo(blendAnimatedFloatPoint(fromTargetPoint, toTargetPoint), m_mode);
+    return true;
+}
+
+bool SVGPathBlender::blendLineToHorizontalSegment()
+{
+    float fromX;
+    float toX;
+    if (!m_fromSource->parseLineToHorizontalSegment(fromX)
+        || !m_toSource->parseLineToHorizontalSegment(toX))
+        return false;
+
+    m_consumer->lineToHorizontal(blendAnimatedFloat(fromX, toX), m_mode);
+    return true;
+}
+
+bool SVGPathBlender::blendLineToVerticalSegment()
+{
+    float fromY;
+    float toY;
+    if (!m_fromSource->parseLineToVerticalSegment(fromY)
+        || !m_toSource->parseLineToVerticalSegment(toY))
+        return false;
+
+    m_consumer->lineToVertical(blendAnimatedFloat(fromY, toY), m_mode);
+    return true;
+}
+
+bool SVGPathBlender::blendCurveToCubicSegment()
+{
+    FloatPoint fromTargetPoint;
+    FloatPoint fromPoint1;
+    FloatPoint fromPoint2;
+    FloatPoint toTargetPoint;
+    FloatPoint toPoint1;
+    FloatPoint toPoint2;
+    if (!m_fromSource->parseCurveToCubicSegment(fromPoint1, fromPoint2, fromTargetPoint)
+        || !m_toSource->parseCurveToCubicSegment(toPoint1, toPoint2, toTargetPoint))
+        return false;
+
+    m_consumer->curveToCubic(blendAnimatedFloatPoint(fromPoint1, toPoint1),
+                             blendAnimatedFloatPoint(fromPoint2, toPoint2),
+                             blendAnimatedFloatPoint(fromTargetPoint, toTargetPoint),
+                             m_mode);
+    return true;
+}
+
+bool SVGPathBlender::blendCurveToCubicSmoothSegment()
+{
+    FloatPoint fromTargetPoint;
+    FloatPoint fromPoint2;
+    FloatPoint toTargetPoint;
+    FloatPoint toPoint2;
+    if (!m_fromSource->parseCurveToCubicSmoothSegment(fromPoint2, fromTargetPoint)
+        || !m_toSource->parseCurveToCubicSmoothSegment(toPoint2, toTargetPoint))
+        return false;
+
+    m_consumer->curveToCubicSmooth(blendAnimatedFloatPoint(fromPoint2, toPoint2),
+                                   blendAnimatedFloatPoint(fromTargetPoint, toTargetPoint),
+                                   m_mode);
+    return true;
+}
+
+bool SVGPathBlender::blendCurveToQuadraticSegment()
+{
+    FloatPoint fromTargetPoint;
+    FloatPoint fromPoint1;
+    FloatPoint toTargetPoint;
+    FloatPoint toPoint1;
+    if (!m_fromSource->parseCurveToQuadraticSegment(fromPoint1, fromTargetPoint)
+        || !m_toSource->parseCurveToQuadraticSegment(toPoint1, toTargetPoint))
+        return false;
+
+    m_consumer->curveToQuadratic(blendAnimatedFloatPoint(fromPoint1, toPoint1),
+                                 blendAnimatedFloatPoint(fromTargetPoint, toTargetPoint),
+                                 m_mode);
+    return true;
+}
+
+bool SVGPathBlender::blendCurveToQuadraticSmoothSegment()
+{
+    FloatPoint fromTargetPoint;
+    FloatPoint toTargetPoint;
+    if (!m_fromSource->parseCurveToQuadraticSmoothSegment(fromTargetPoint)
+        || !m_toSource->parseCurveToQuadraticSmoothSegment(toTargetPoint))
+        return false;
+
+    m_consumer->curveToQuadraticSmooth(blendAnimatedFloatPoint(fromTargetPoint, toTargetPoint), m_mode);
+    return true;
+}
+
+bool SVGPathBlender::blendArcToSegment()
+{
+    float fromRx;
+    float fromRy;
+    float fromAngle;
+    bool fromLargeArc;
+    bool fromSweep;
+    FloatPoint fromTargetPoint;
+    float toRx;
+    float toRy;
+    float toAngle;
+    bool toLargeArc;
+    bool toSweep;
+    FloatPoint toTargetPoint;
+    if (!m_fromSource->parseArcToSegment(fromRx, fromRy, fromAngle, fromLargeArc, fromSweep, fromTargetPoint)
+        || !m_toSource->parseArcToSegment(toRx, toRy, toAngle, toLargeArc, toSweep, toTargetPoint))
+        return false;
+
+    m_consumer->arcTo(blendAnimatedFloat(fromRx, toRx),
+                      blendAnimatedFloat(fromRy, toRy),
+                      blendAnimatedFloat(fromAngle, toAngle),
+                      m_progress < 0.5 ? fromLargeArc : toLargeArc,
+                      m_progress < 0.5 ? fromSweep : toSweep,
+                      blendAnimatedFloatPoint(fromTargetPoint, toTargetPoint),
+                      m_mode);
+    return true;
+}
+
+bool SVGPathBlender::blendAnimatedPath(float progress, SVGPathSource* fromSource, SVGPathSource* toSource, SVGPathConsumer* consumer)
+{
+    ASSERT(fromSource);
+    ASSERT(toSource);
+    ASSERT(consumer);
+    m_fromSource = fromSource;
+    m_toSource = toSource;
+    m_consumer = consumer;
+
+    m_progress = progress;
+    while (true) {
+        SVGPathSegType fromCommand;
+        SVGPathSegType toCommand;
+        if (!m_fromSource->parseSVGSegmentType(fromCommand) || !m_toSource->parseSVGSegmentType(toCommand))
+            return false;
+        if (fromCommand != toCommand)
+            return false;
+
+        m_mode = AbsoluteCoordinates;
+        switch (fromCommand) {
+        case PathSegMoveToRel:
+            m_mode = RelativeCoordinates;
+        case PathSegMoveToAbs:
+            if (!blendMoveToSegment())
+                return false;
+            break;
+        case PathSegLineToRel:
+            m_mode = RelativeCoordinates;
+        case PathSegLineToAbs:
+            if (!blendLineToSegment())
+                return false;
+            break;
+        case PathSegLineToHorizontalRel:
+            m_mode = RelativeCoordinates;
+        case PathSegLineToHorizontalAbs:
+            if (!blendLineToHorizontalSegment())
+                return false;
+            break;
+        case PathSegLineToVerticalRel:
+            m_mode = RelativeCoordinates;
+        case PathSegLineToVerticalAbs:
+            if (!blendLineToVerticalSegment())
+                return false;
+            break;
+        case PathSegClosePath:
+            m_consumer->closePath();
+            break;
+        case PathSegCurveToCubicRel:
+            m_mode = RelativeCoordinates;
+        case PathSegCurveToCubicAbs:
+            if (!blendCurveToCubicSegment())
+                return false;
+            break;
+        case PathSegCurveToCubicSmoothRel:
+            m_mode = RelativeCoordinates;
+        case PathSegCurveToCubicSmoothAbs:
+            if (!blendCurveToCubicSmoothSegment())
+                return false;
+            break;
+        case PathSegCurveToQuadraticRel:
+            m_mode = RelativeCoordinates;
+        case PathSegCurveToQuadraticAbs:
+            if (!blendCurveToQuadraticSegment())
+                return false;
+            break;
+        case PathSegCurveToQuadraticSmoothRel:
+            m_mode = RelativeCoordinates;
+        case PathSegCurveToQuadraticSmoothAbs:
+            if (!blendCurveToQuadraticSmoothSegment())
+                return false;
+            break;
+        case PathSegArcRel:
+            m_mode = RelativeCoordinates;
+        case PathSegArcAbs:
+            if (!blendArcToSegment())
+                return false;
+            break;
+        default:
+            return false;
+        }
+        if (m_fromSource->hasMoreData() != m_toSource->hasMoreData())
+            return false;
+        if (!m_fromSource->hasMoreData() || !m_toSource->hasMoreData())
+            break;
+    }
+    return true;
+}
+
+void SVGPathBlender::cleanup()
+{
+    ASSERT(m_toSource);
+    ASSERT(m_fromSource);
+    ASSERT(m_consumer);
+
+    m_consumer->cleanup();
+    m_toSource = 0;
+    m_fromSource = 0;
+    m_consumer = 0;
+}
+
+}
+
+#endif // ENABLE(SVG)