[Viewer] Preserve gesture transformation matrix on slide/backend change

Change-Id: I417fb9b6d6b7c95884dff6871731883fe3736437
Reviewed-on: https://skia-review.googlesource.com/91460
Reviewed-by: Brian Osman <brianosman@google.com>
Commit-Queue: Brian Salomon <bsalomon@google.com>

1 files changed, 6 insertions, 2 deletions

diff --git a/src/views/SkTouchGesture.cpp b/src/views/SkTouchGesture.cpp
index dbcec511b7..4dce06a6f3 100644
--- a/src/views/SkTouchGesture.cpp
+++ b/src/views/SkTouchGesture.cpp
@@ -108,17 +108,21 @@ SkTouchGesture::SkTouchGesture() {
 SkTouchGesture::~SkTouchGesture() {
 }
 
-void SkTouchGesture::reset() {
+void SkTouchGesture::resetTouchState() {
     fIsTransLimited = false;
     fTouches.reset();
     fState = kEmpty_State;
     fLocalM.reset();
-    fGlobalM.reset();
 
     fLastUpMillis = SkTime::GetMSecs() - 2*MAX_DBL_TAP_INTERVAL;
     fLastUpP.set(0, 0);
 }
 
+void SkTouchGesture::reset() {
+    fGlobalM.reset();
+    this->resetTouchState();
+}
+
 void SkTouchGesture::flushLocalM() {
     fGlobalM.postConcat(fLocalM);
     fLocalM.reset();