Map Viewer mouse events to Slide space.

There isn't much Slide can do with Window-space mouse events.

Change-Id: I36509d4aa1b2ed510b8d8739d39cf5204ad486cc
Reviewed-on: https://skia-review.googlesource.com/102149
Reviewed-by: Brian Osman <brianosman@google.com>
Commit-Queue: Florin Malita <fmalita@chromium.org>

1 files changed, 9 insertions, 3 deletions

diff --git a/tools/viewer/Viewer.cpp b/tools/viewer/Viewer.cpp
index 35b0e146f9..7d69567a29 100644
--- a/tools/viewer/Viewer.cpp
+++ b/tools/viewer/Viewer.cpp
@@ -866,9 +866,15 @@ bool Viewer::onMouse(int x, int y, Window::InputState state, uint32_t modifiers)
         return false;
     }
 
-    if (fSlides[fCurrentSlide]->onMouse(x, y, state, modifiers)) {
-        fWindow->inval();
-        return true;
+    const auto slideMatrix = this->computeMatrix();
+    SkMatrix slideInvMatrix;
+    if (slideMatrix.invert(&slideInvMatrix)) {
+        SkPoint slideMouse = SkPoint::Make(x, y);
+        slideInvMatrix.mapPoints(&slideMouse, 1);
+        if (fSlides[fCurrentSlide]->onMouse(slideMouse.x(), slideMouse.y(), state, modifiers)) {
+            fWindow->inval();
+            return true;
+        }
     }
 
     switch (state) {