Fix memory out-of-bounds issue when multiple PAGView load the same PA…

…G file. (#2279)

Co-authored-by: kevingpqi <[email protected]>

include/pag/file.h

@@ -314,33 +314,35 @@ class AnimatableProperty : public Property<T> {
 
  T getValueAt(Frame frame) override {
  T result;
- Keyframe<T>* lastKeyframe = keyframes[lastKeyframeIndex];
+ size_t lastKeyframeIndexInternal = lastKeyframeIndex;
+ Keyframe<T>* lastKeyframe = keyframes[lastKeyframeIndexInternal];
  if (lastKeyframe->containsTime(frame)) {
  return lastKeyframe->getValueAt(frame);
  }
  if (frame < lastKeyframe->startTime) {
- while (lastKeyframeIndex > 0) {
- lastKeyframeIndex--;
- if (keyframes[lastKeyframeIndex]->containsTime(frame)) {
+ while (lastKeyframeIndexInternal > 0) {
+ lastKeyframeIndexInternal--;
+ if (keyframes[lastKeyframeIndexInternal]->containsTime(frame)) {
  break;
  }
  }
  } else {
- while (lastKeyframeIndex < keyframes.size() - 1) {
- lastKeyframeIndex++;
- if (keyframes[lastKeyframeIndex]->containsTime(frame)) {
+ while (lastKeyframeIndexInternal < keyframes.size() - 1) {
+ lastKeyframeIndexInternal++;
+ if (keyframes[lastKeyframeIndexInternal]->containsTime(frame)) {
  break;
  }
  }
  }
- lastKeyframe = keyframes[lastKeyframeIndex];
+ lastKeyframe = keyframes[lastKeyframeIndexInternal];
  if (frame <= lastKeyframe->startTime) {
  result = lastKeyframe->startValue;
  } else if (frame >= lastKeyframe->endTime) {
  result = lastKeyframe->endValue;
  } else {
  result = lastKeyframe->getValueAt(frame);
  }
+ lastKeyframeIndex = lastKeyframeIndexInternal;
  return result;
  }