[skotty] Clip/scale/center animations in Viewer

Animations have explicit bounds.  Updated Viewer to map the animation
to its full viewport.

TBR=
Change-Id: I5a016cace8ae97e9b4f0b93261fcfb4993ea2307
Reviewed-on: https://skia-review.googlesource.com/90263
Reviewed-by: Florin Malita <fmalita@chromium.org>
Commit-Queue: Florin Malita <fmalita@chromium.org>

1 files changed, 7 insertions, 0 deletions

diff --git a/tools/viewer/SkottySlide.cpp b/tools/viewer/SkottySlide.cpp
index d65b7ecbc1..432b307a5e 100644
--- a/tools/viewer/SkottySlide.cpp
+++ b/tools/viewer/SkottySlide.cpp
@@ -8,6 +8,7 @@
 #include "SkottySlide.h"
 
 #include "SkAnimTimer.h"
+#include "SkCanvas.h"
 #include "Skotty.h"
 #include "SkStream.h"
 
@@ -42,6 +43,12 @@ SkISize SkottySlide::getDimensions() const {
 
 void SkottySlide::draw(SkCanvas* canvas) {
     if (fAnimation) {
+        SkAutoCanvasRestore acr(canvas, true);
+        const auto animationBounds = SkRect::Make(fAnimation->size().toCeil());
+        canvas->concat(SkMatrix::MakeRectToRect(animationBounds,
+                                                SkRect::Make(canvas->imageInfo().bounds()),
+                                                SkMatrix::kCenter_ScaleToFit));
+        canvas->clipRect(animationBounds);
         fAnimation->render(canvas);
     }
 }