feat: 帧动画Timeline问题处理

2026-08-02 02:22:46 +08:00
parent 20a458ec78
commit 64c7245d9e
12 changed files with 2411 additions and 1247 deletions
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-    frameName: "\u68C0\u7D22 75.aseprite"
+    frameName: "\u68C0\u7D22(1) 75.aseprite"
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    durationMs: 200
-    frameName: "\u68C0\u7D22 76.aseprite"
+    frameName: "\u68C0\u7D22(1) 76.aseprite"
    sourceIndex: 76
-  - sprite: {fileID: 1947069765, guid: 060544baeb316214698dd0ea788a63dd, type: 3}
+  - sprite: {fileID: 576137929, guid: 060544baeb316214698dd0ea788a63dd, type: 3}
    durationMs: 200
-    frameName: "\u68C0\u7D22 77.aseprite"
+    frameName: "\u68C0\u7D22(1) 77.aseprite"
    sourceIndex: 77
-  - sprite: {fileID: 1547981314, guid: 060544baeb316214698dd0ea788a63dd, type: 3}
+  - sprite: {fileID: -314263957, guid: 060544baeb316214698dd0ea788a63dd, type: 3}
    durationMs: 200
-    frameName: "\u68C0\u7D22 78.aseprite"
+    frameName: "\u68C0\u7D22(1) 78.aseprite"
    sourceIndex: 78
-  - sprite: {fileID: 1904593827, guid: 060544baeb316214698dd0ea788a63dd, type: 3}
+  - sprite: {fileID: 1140765657, guid: 060544baeb316214698dd0ea788a63dd, type: 3}
    durationMs: 200
-    frameName: "\u68C0\u7D22 79.aseprite"
+    frameName: "\u68C0\u7D22(1) 79.aseprite"
    sourceIndex: 79
  speed: 1
  defaultEndBehavior: 2
@@ -348,5 +348,5 @@ MonoBehaviour:
    asepriteJson: {fileID: 4900000, guid: 9281f1c256bc53140a36bb9439d2d5d6, type: 3}
    pivot: {x: 0.5, y: 0.5}
    manageSpriteSlicing: 1
-    lastSourceHash: a0c976cb23f6f387b5a0d81c36299682ec4e5b14a0894eb63b5aaf19fc228739
+    lastSourceHash: e24b62891974cbe19bc0868bcfa298b82c6d4f485faea653b802122dd6ea79a1
    lastImportedTagName: intro
@@ -648,8 +648,7 @@
  "size": { "w": 6144, "h": 4320 },
  "scale": "1",
  "frameTags": [
-   { "name": "intro", "from": 0, "to": 47, "direction": "forward", "color": "#000000ff" },
-   { "name": "loop", "from": 48, "to": 79, "direction": "forward", "color": "#000000ff" }
+   { "name": "intro", "from": 0, "to": 79, "direction": "forward", "color": "#000000ff" }
  ],
  "layers": [
   { "name": "black", "opacity": 89, "blendMode": "normal" },
@@ -24,7 +24,7 @@ MonoBehaviour:
  - m_Version: 1
    m_Start: 0
    m_ClipIn: 0
-    m_Asset: {fileID: 3051057393504210916}
+    m_Asset: {fileID: -2259439808282263793}
    m_Duration: 5.2
    m_TimeScale: 1
    m_ParentTrack: {fileID: -5039998276998606052}
@@ -92,6 +92,21 @@ MonoBehaviour:
    m_DisplayName: "\u68C0\u7D22"
  m_Markers:
    m_Objects: []
+--- !u!114 &-2259439808282263793
+MonoBehaviour:
+  m_ObjectHideFlags: 1
+  m_CorrespondingSourceObject: {fileID: 0}
+  m_PrefabInstance: {fileID: 0}
+  m_PrefabAsset: {fileID: 0}
+  m_GameObject: {fileID: 0}
+  m_Enabled: 1
+  m_EditorHideFlags: 0
+  m_Script: {fileID: 11500000, guid: c908631f9d7446ac86914dce3f1927af, type: 3}
+  m_Name: FrameAnimationTimelineClip
+  m_EditorClassIdentifier: 
+  frameClip: {fileID: 11400000, guid: dc9666f5991e1be4bb0e5f149055f91a, type: 2}
+  synchronizedDurationSource: {fileID: 11400000, guid: dc9666f5991e1be4bb0e5f149055f91a, type: 2}
+  hasSynchronizedDuration: 1
 --- !u!114 &11400000
 MonoBehaviour:
  m_ObjectHideFlags: 0
@@ -113,18 +128,3 @@ MonoBehaviour:
    m_ScenePreview: 1
  m_DurationMode: 0
  m_MarkerTrack: {fileID: 0}
--- !u!114 &3051057393504210916
-MonoBehaviour:
-  m_ObjectHideFlags: 1
-  m_CorrespondingSourceObject: {fileID: 0}
-  m_PrefabInstance: {fileID: 0}
-  m_PrefabAsset: {fileID: 0}
-  m_GameObject: {fileID: 0}
-  m_Enabled: 1
-  m_EditorHideFlags: 0
-  m_Script: {fileID: 11500000, guid: c908631f9d7446ac86914dce3f1927af, type: 3}
-  m_Name: FrameAnimationTimelineClip
-  m_EditorClassIdentifier: 
-  frameClip: {fileID: 11400000, guid: dc9666f5991e1be4bb0e5f149055f91a, type: 2}
-  synchronizedDurationSource: {fileID: 11400000, guid: dc9666f5991e1be4bb0e5f149055f91a, type: 2}
-  hasSynchronizedDuration: 1
@@ -11141,7 +11141,7 @@ MeshRenderer:
  m_RenderingLayerMask: 1
  m_RendererPriority: 0
  m_Materials:
-  - {fileID: -6659093157667844055, guid: f242fb3dde1933640859f1c54591c9c8, type: 2}
+  - {fileID: 5536230373871310787, guid: 1625bd86098eb0843b1a69eb1b3354e4, type: 2}
  m_StaticBatchInfo:
    firstSubMesh: 0
    subMeshCount: 0
@@ -11185,8 +11185,8 @@ MonoBehaviour:
      m_Calls: []
  m_text: "\u5F85\u529E\u6E05\u5355"
  m_isRightToLeft: 0
-  m_fontAsset: {fileID: 11400000, guid: f242fb3dde1933640859f1c54591c9c8, type: 2}
-  m_sharedMaterial: {fileID: -6659093157667844055, guid: f242fb3dde1933640859f1c54591c9c8, type: 2}
+  m_fontAsset: {fileID: 11400000, guid: 1625bd86098eb0843b1a69eb1b3354e4, type: 2}
+  m_sharedMaterial: {fileID: 5536230373871310787, guid: 1625bd86098eb0843b1a69eb1b3354e4, type: 2}
  m_fontSharedMaterials: []
  m_fontMaterial: {fileID: 0}
  m_fontMaterials: []
@@ -89,6 +89,7 @@ namespace AibisDream.FrameAnimation
        private bool hasStarted;
        private bool hasCompleted;
        private bool hasCompletedFirstTerminalLoopCycle;
+        private SeekIndex seekIndex;

        public string PlayableId => plan.PlayableId;
        public string CurrentClipId => CurrentStep?.Clip != null ? CurrentStep.Clip.Id : string.Empty;
@@ -140,10 +141,49 @@ namespace AibisDream.FrameAnimation

        internal FrameAnimationSessionEvaluation Seek(double realSeconds, Action<Sprite> applySprite)
        {
-            Restart(applySprite);
-            return realSeconds <= 0d
-                ? FrameAnimationSessionEvaluation.Running
-                : Evaluate(realSeconds, 1f, applySprite);
+            if (!TryGetSeekIndex(out var index, out var error))
+            {
+                hasStarted = true;
+                hasCompleted = true;
+                return FrameAnimationSessionEvaluation.Failed(error.Code, error.Message);
+            }
+
+            hasStarted = true;
+            hasCompleted = false;
+            hasCompletedFirstTerminalLoopCycle = false;
+
+            var clampedSeconds = Math.Max(0d, realSeconds);
+            var terminalStepIndex = index.Steps.Length - 1;
+            var terminalStep = index.Steps[terminalStepIndex];
+            if (terminalStep.EndBehavior == FrameClipEndBehavior.Loop &&
+                clampedSeconds + Epsilon >= terminalStep.StartSeconds)
+            {
+                SeekTerminalLoop(terminalStepIndex, terminalStep, clampedSeconds);
+                ApplyCurrentFrame(applySprite);
+                return FrameAnimationSessionEvaluation.Running;
+            }
+
+            if (!double.IsPositiveInfinity(index.TotalDurationSeconds) &&
+                clampedSeconds + Epsilon >= index.TotalDurationSeconds)
+            {
+                stepIndex = terminalStepIndex;
+                frameIndex = terminalStep.FrameEndSeconds.Length - 1;
+                frameElapsedSeconds = 0d;
+                hasCompleted = true;
+                ApplyCurrentFrame(applySprite);
+                return FrameAnimationSessionEvaluation.Completed(terminalStep.EndBehavior);
+            }
+
+            stepIndex = FindFirstBoundaryAfter(index.StepEndSeconds, clampedSeconds);
+            if (stepIndex < 0 || stepIndex >= index.Steps.Length)
+            {
+                stepIndex = terminalStepIndex;
+            }
+
+            var seekStep = index.Steps[stepIndex];
+            SeekWithinStep(seekStep, clampedSeconds - seekStep.StartSeconds);
+            ApplyCurrentFrame(applySprite);
+            return FrameAnimationSessionEvaluation.Running;
        }

        public FrameAnimationSessionEvaluation Evaluate(
@@ -273,6 +313,169 @@ namespace AibisDream.FrameAnimation
            return clip.TotalDurationMs / 1000d;
        }

+        private bool TryGetSeekIndex(
+            out SeekIndex index,
+            out FrameAnimationPlaybackError error)
+        {
+            if (seekIndex != null)
+            {
+                index = seekIndex;
+                error = FrameAnimationPlaybackError.None;
+                return true;
+            }
+
+            if (plan.Steps == null || plan.Steps.Count == 0)
+            {
+                index = null;
+                error = new FrameAnimationPlaybackError(
+                    FrameAnimationPlaybackErrorCode.InvalidPlayableData,
+                    "播放计划不包含任何可播放 Step。");
+                return false;
+            }
+
+            var steps = new SeekStep[plan.Steps.Count];
+            var stepEndSeconds = new double[steps.Length];
+            var elapsedSeconds = 0d;
+            for (var currentStepIndex = 0; currentStepIndex < steps.Length; currentStepIndex++)
+            {
+                var resolvedStep = plan.Steps[currentStepIndex];
+                if (resolvedStep?.Clip == null || resolvedStep.Clip.FrameCount <= 0)
+                {
+                    index = null;
+                    error = new FrameAnimationPlaybackError(
+                        FrameAnimationPlaybackErrorCode.InvalidPlayableData,
+                        "播放期间 Clip 或 Frame 数据失效。");
+                    return false;
+                }
+
+                if (!FrameAnimationValueUtility.IsValidSpeed(resolvedStep.PlaybackSpeed))
+                {
+                    index = null;
+                    error = new FrameAnimationPlaybackError(
+                        FrameAnimationPlaybackErrorCode.InvalidSpeed,
+                        "播放期间有效速度变为无效值。");
+                    return false;
+                }
+
+                var frameEndSeconds = new double[resolvedStep.Clip.FrameCount];
+                var stepDurationSeconds = 0d;
+                for (var currentFrameIndex = 0;
+                     currentFrameIndex < resolvedStep.Clip.FrameCount;
+                     currentFrameIndex++)
+                {
+                    var frame = resolvedStep.Clip.Frames[currentFrameIndex];
+                    if (frame == null || frame.DurationMs <= 0)
+                    {
+                        index = null;
+                        error = new FrameAnimationPlaybackError(
+                            FrameAnimationPlaybackErrorCode.InvalidPlayableData,
+                            "播放期间 Frame 数据失效或 durationMs 不再有效。");
+                        return false;
+                    }
+
+                    if (resolvedStep.PlaybackSpeed == 0f)
+                    {
+                        frameEndSeconds[currentFrameIndex] = double.PositiveInfinity;
+                    }
+                    else
+                    {
+                        stepDurationSeconds += frame.DurationMs / 1000d / resolvedStep.PlaybackSpeed;
+                        frameEndSeconds[currentFrameIndex] = stepDurationSeconds;
+                    }
+                }
+
+                if (resolvedStep.PlaybackSpeed == 0f)
+                {
+                    stepDurationSeconds = double.PositiveInfinity;
+                }
+
+                steps[currentStepIndex] = new SeekStep(
+                    elapsedSeconds,
+                    stepDurationSeconds,
+                    resolvedStep.PlaybackSpeed,
+                    resolvedStep.TerminalEndBehavior,
+                    frameEndSeconds);
+                elapsedSeconds += stepDurationSeconds;
+                stepEndSeconds[currentStepIndex] = elapsedSeconds;
+            }
+
+            seekIndex = new SeekIndex(steps, stepEndSeconds, elapsedSeconds);
+            index = seekIndex;
+            error = FrameAnimationPlaybackError.None;
+            return true;
+        }
+
+        private void SeekTerminalLoop(
+            int terminalStepIndex,
+            SeekStep terminalStep,
+            double realSeconds)
+        {
+            stepIndex = terminalStepIndex;
+            if (terminalStep.PlaybackSpeed == 0f ||
+                double.IsPositiveInfinity(terminalStep.DurationSeconds))
+            {
+                frameIndex = 0;
+                frameElapsedSeconds = 0d;
+                return;
+            }
+
+            var terminalElapsedSeconds = Math.Max(0d, realSeconds - terminalStep.StartSeconds);
+            hasCompletedFirstTerminalLoopCycle =
+                terminalElapsedSeconds + Epsilon >= terminalStep.DurationSeconds;
+            var localSeconds = terminalElapsedSeconds % terminalStep.DurationSeconds;
+            if (localSeconds + Epsilon >= terminalStep.DurationSeconds)
+            {
+                localSeconds = 0d;
+            }
+
+            SeekWithinStep(terminalStep, localSeconds);
+        }
+
+        private void SeekWithinStep(SeekStep seekStep, double localRealSeconds)
+        {
+            if (seekStep.PlaybackSpeed == 0f)
+            {
+                frameIndex = 0;
+                frameElapsedSeconds = 0d;
+                return;
+            }
+
+            var clampedLocalSeconds = Math.Max(0d, localRealSeconds);
+            frameIndex = FindFirstBoundaryAfter(seekStep.FrameEndSeconds, clampedLocalSeconds);
+            if (frameIndex < 0 || frameIndex >= seekStep.FrameEndSeconds.Length)
+            {
+                frameIndex = seekStep.FrameEndSeconds.Length - 1;
+            }
+
+            var frameStartRealSeconds = frameIndex == 0
+                ? 0d
+                : seekStep.FrameEndSeconds[frameIndex - 1];
+            frameElapsedSeconds = Math.Max(
+                0d,
+                (clampedLocalSeconds - frameStartRealSeconds) * seekStep.PlaybackSpeed);
+        }
+
+        private static int FindFirstBoundaryAfter(double[] boundaries, double seconds)
+        {
+            var low = 0;
+            var high = boundaries.Length;
+            var comparisonSeconds = seconds + Epsilon;
+            while (low < high)
+            {
+                var middle = low + ((high - low) >> 1);
+                if (boundaries[middle] > comparisonSeconds)
+                {
+                    high = middle;
+                }
+                else
+                {
+                    low = middle + 1;
+                }
+            }
+
+            return low;
+        }
+
        private void ApplyCurrentFrame(Action<Sprite> applySprite)
        {
            var step = CurrentStep;
@@ -283,5 +486,45 @@ namespace AibisDream.FrameAnimation

            applySprite?.Invoke(step.Clip.Frames[frameIndex]?.Sprite);
        }
+
+        private sealed class SeekIndex
+        {
+            internal SeekStep[] Steps { get; }
+            internal double[] StepEndSeconds { get; }
+            internal double TotalDurationSeconds { get; }
+
+            internal SeekIndex(
+                SeekStep[] steps,
+                double[] stepEndSeconds,
+                double totalDurationSeconds)
+            {
+                Steps = steps;
+                StepEndSeconds = stepEndSeconds;
+                TotalDurationSeconds = totalDurationSeconds;
+            }
+        }
+
+        private sealed class SeekStep
+        {
+            internal double StartSeconds { get; }
+            internal double DurationSeconds { get; }
+            internal float PlaybackSpeed { get; }
+            internal FrameClipEndBehavior EndBehavior { get; }
+            internal double[] FrameEndSeconds { get; }
+
+            internal SeekStep(
+                double startSeconds,
+                double durationSeconds,
+                float playbackSpeed,
+                FrameClipEndBehavior endBehavior,
+                double[] frameEndSeconds)
+            {
+                StartSeconds = startSeconds;
+                DurationSeconds = durationSeconds;
+                PlaybackSpeed = playbackSpeed;
+                EndBehavior = endBehavior;
+                FrameEndSeconds = frameEndSeconds;
+            }
+        }
    }
 }
@@ -18,6 +18,7 @@ namespace AibisDream.FrameAnimation
        private FrameAnimationPlaybackSession session;
        private FrameAnimationPlaybackHandle activeHandle;
        private FrameAnimationPlaybackState state = FrameAnimationPlaybackState.Stopped;
+        private Action<Sprite> applySpriteCallback;
        private bool _skipInitialPlayOnEnable;
        private bool hasStartedPlayback;

@@ -100,7 +101,7 @@ namespace AibisDream.FrameAnimation
                return;
            }

-            var evaluation = session.Evaluate(Time.deltaTime, speed, ApplySprite);
+            var evaluation = session.Evaluate(Time.deltaTime, speed, ApplySpriteCallback);
            if (evaluation.IsFailed)
            {
                FailActive(evaluation.Error.Code, evaluation.Error.Message);
@@ -255,7 +256,7 @@ namespace AibisDream.FrameAnimation
                session = new FrameAnimationPlaybackSession(plan);
                activeHandle = handle;
                state = FrameAnimationPlaybackState.Playing;
-                session.Start(ApplySprite);
+                session.Start(ApplySpriteCallback);
                return handle;
            }

@@ -332,7 +333,7 @@ namespace AibisDream.FrameAnimation
                return;
            }

-            var evaluation = session.Evaluate(deltaTimeSeconds, speed, ApplySprite);
+            var evaluation = session.Evaluate(deltaTimeSeconds, speed, ApplySpriteCallback);
            if (evaluation.IsFailed)
            {
                FailActive(evaluation.Error.Code, evaluation.Error.Message);
@@ -399,7 +400,7 @@ namespace AibisDream.FrameAnimation
            state = FrameAnimationPlaybackState.Playing;
            target = resolvedTarget;
            target.Enabled = true;
-            session.Start(ApplySprite);
+            session.Start(ApplySpriteCallback);
            return handle;
        }

@@ -517,12 +518,15 @@ namespace AibisDream.FrameAnimation

        private void ApplySprite(Sprite sprite)
        {
-            if (target != null && target.IsValid)
+            if (target != null && target.IsValid && target.Sprite != sprite)
            {
                target.Sprite = sprite;
            }
        }

+        private Action<Sprite> ApplySpriteCallback =>
+            applySpriteCallback ??= ApplySprite;
+
        private bool ShouldWaitForFirstPass(FrameAnimationPlaybackHandle playbackHandle)
        {
            if (playbackHandle.IsCompleted || activeHandle != playbackHandle || session == null)
@@ -559,12 +563,15 @@ namespace AibisDream.FrameAnimation
                case FrameClipEndBehavior.Clear:
                    if (target != null && target.IsValid)
                    {
-                        target.Enabled = true;
-                        target.Sprite = null;
+                        if (!target.Enabled)
+                        {
+                            target.Enabled = true;
+                        }
+                        ApplySprite(null);
                    }
                    break;
                case FrameClipEndBehavior.HideTarget:
-                    if (target != null && target.IsValid)
+                    if (target != null && target.IsValid && target.Enabled)
                    {
                        target.Enabled = false;
                    }
@@ -579,11 +586,17 @@ namespace AibisDream.FrameAnimation
                case FrameAnimationStopMode.HoldCurrentFrame:
                    break;
                case FrameAnimationStopMode.Clear:
-                    target.Enabled = true;
-                    target.Sprite = null;
+                    if (!target.Enabled)
+                    {
+                        target.Enabled = true;
+                    }
+                    ApplySprite(null);
                    break;
                case FrameAnimationStopMode.HideTarget:
-                    target.Enabled = false;
+                    if (target.Enabled)
+                    {
+                        target.Enabled = false;
+                    }
                    break;
            }
        }
@@ -17,6 +17,7 @@ namespace AibisDream.FrameAnimation
        private FrameAnimationPlaybackSession session;
        private FrameAnimationPlaybackHandle activeHandle;
        private FrameAnimationPlaybackState state = FrameAnimationPlaybackState.Stopped;
+        private Action<Sprite> applySpriteCallback;
        private bool skipInitialPlayOnEnable;
        private bool timelineControlled;
        private FrameClip timelineClip;
@@ -130,7 +131,7 @@ namespace AibisDream.FrameAnimation
                session = new FrameAnimationPlaybackSession(plan);
                activeHandle = handle;
                state = FrameAnimationPlaybackState.Playing;
-                session.Start(ApplySprite);
+                session.Start(ApplySpriteCallback);
                return handle;
            }

@@ -251,12 +252,14 @@ namespace AibisDream.FrameAnimation

                timelineClip = value;
                session = new FrameAnimationPlaybackSession(plan);
-                session.Start(ApplySprite);
            }

-            target.Enabled = true;
+            if (!target.Enabled)
+            {
+                target.Enabled = true;
+            }
            state = FrameAnimationPlaybackState.Playing;
-            var evaluation = session.Seek(Math.Max(0d, timeSeconds), ApplySprite);
+            var evaluation = session.Seek(Math.Max(0d, timeSeconds), ApplySpriteCallback);
            if (evaluation.IsFailed)
            {
                session = null;
@@ -299,6 +302,13 @@ namespace AibisDream.FrameAnimation
                return SampleTimeline(value, Math.Max(0d, duration - 0.000001d));
            }

+            if (value.DefaultEndBehavior == FrameClipEndBehavior.Clear ||
+                value.DefaultEndBehavior == FrameClipEndBehavior.HideTarget)
+            {
+                ApplyEndBehavior(value.DefaultEndBehavior);
+                return FrameAnimationPlaybackError.None;
+            }
+
            var sampleError = SampleTimeline(value, GetEffectiveClipDurationSeconds(value));
            if (sampleError.Code == FrameAnimationPlaybackErrorCode.None)
            {
@@ -310,8 +320,11 @@ namespace AibisDream.FrameAnimation
        internal void RestoreTimelineBaseline()
        {
            if (!timelineControlled || target == null || !target.IsValid) return;
-            target.Sprite = timelineBaselineSprite;
-            target.Enabled = timelineBaselineEnabled;
+            ApplySprite(timelineBaselineSprite);
+            if (target.Enabled != timelineBaselineEnabled)
+            {
+                target.Enabled = timelineBaselineEnabled;
+            }
            session = null;
            timelineClip = null;
            state = FrameAnimationPlaybackState.Stopped;
@@ -364,7 +377,7 @@ namespace AibisDream.FrameAnimation
                return;
            }

-            var evaluation = session.Evaluate(deltaTimeSeconds, speed, ApplySprite);
+            var evaluation = session.Evaluate(deltaTimeSeconds, speed, ApplySpriteCallback);
            if (evaluation.IsFailed) FailActive(evaluation.Error.Code, evaluation.Error.Message);
            else if (evaluation.IsCompleted) CompleteNaturally(evaluation.EndBehavior);
        }
@@ -386,7 +399,7 @@ namespace AibisDream.FrameAnimation
            state = FrameAnimationPlaybackState.Playing;
            target = resolvedTarget;
            target.Enabled = true;
-            session.Start(ApplySprite);
+            session.Start(ApplySpriteCallback);
            return handle;
        }

@@ -525,9 +538,15 @@ namespace AibisDream.FrameAnimation

        private void ApplySprite(Sprite sprite)
        {
-            if (target != null && target.IsValid) target.Sprite = sprite;
+            if (target != null && target.IsValid && target.Sprite != sprite)
+            {
+                target.Sprite = sprite;
+            }
        }

+        private Action<Sprite> ApplySpriteCallback =>
+            applySpriteCallback ??= ApplySprite;
+
        private bool ShouldWaitForFirstPass(FrameAnimationPlaybackHandle playbackHandle)
        {
            return !playbackHandle.IsCompleted && activeHandle == playbackHandle && session != null &&
@@ -556,12 +575,18 @@ namespace AibisDream.FrameAnimation
                case FrameClipEndBehavior.Clear:
                    if (target != null && target.IsValid)
                    {
-                        target.Enabled = true;
-                        target.Sprite = null;
+                        if (!target.Enabled)
+                        {
+                            target.Enabled = true;
+                        }
+                        ApplySprite(null);
                    }
                    break;
                case FrameClipEndBehavior.HideTarget:
-                    if (target != null && target.IsValid) target.Enabled = false;
+                    if (target != null && target.IsValid && target.Enabled)
+                    {
+                        target.Enabled = false;
+                    }
                    break;
            }
        }
@@ -571,11 +596,17 @@ namespace AibisDream.FrameAnimation
            switch (mode)
            {
                case FrameAnimationStopMode.Clear:
-                    target.Enabled = true;
-                    target.Sprite = null;
+                    if (!target.Enabled)
+                    {
+                        target.Enabled = true;
+                    }
+                    ApplySprite(null);
                    break;
                case FrameAnimationStopMode.HideTarget:
-                    target.Enabled = false;
+                    if (target.Enabled)
+                    {
+                        target.Enabled = false;
+                    }
                    break;
            }
        }
@@ -103,7 +103,6 @@ namespace AibisDream.FrameAnimation.Timeline
                var clipInfo = clips[activeIndex];
                terminalClip = clipInfo.Asset?.FrameClip;
                var localTime = playable.GetInput(activeIndex).GetTime();
-                localTime = NormalizeLoopTime(terminalClip, localTime);
                ReportError(currentPlayer.SampleTimeline(terminalClip, localTime), currentPlayer);
                return;
            }
@@ -177,21 +176,6 @@ namespace AibisDream.FrameAnimation.Timeline
            return selected;
        }

-        private static double NormalizeLoopTime(FrameClip clip, double localTime)
-        {
-            if (clip == null || clip.DefaultEndBehavior != FrameClipEndBehavior.Loop)
-            {
-                return Math.Max(0d, localTime);
-            }
-
-            var duration = FrameAnimationTimelineClip.GetEffectiveDuration(clip);
-            if (duration <= 0d)
-            {
-                return 0d;
-            }
-            return Math.Max(0d, localTime) % duration;
-        }
-
        private void ReleaseCurrentPlayer()
        {
            if (currentPlayer != null)
@@ -128,6 +128,141 @@ namespace AibisDream.FrameAnimation.Tests.EditMode
            Assert.That(session.CurrentFrameIndex, Is.EqualTo(2));
        }

+        [Test]
+        public void PlaybackSession_SeekSamplesVariableDurationsAtExactBoundaries()
+        {
+            var clip = CreateClip(
+                "Variable",
+                FrameClipEndBehavior.HoldLastFrame,
+                1f,
+                100,
+                200,
+                50);
+            Assert.That(
+                FrameAnimationResolver.TryResolveClip(
+                    clip,
+                    default,
+                    out var plan,
+                    out var error),
+                Is.True,
+                error.ToString());
+            var session = new FrameAnimationPlaybackSession(plan);
+
+            AssertSeekFrame(session, -1d, 0, false);
+            AssertSeekFrame(session, 0.099d, 0, false);
+            AssertSeekFrame(session, 0.1d, 1, false);
+            AssertSeekFrame(session, 0.299d, 1, false);
+            AssertSeekFrame(session, 0.3d, 2, false);
+            AssertSeekFrame(session, 0.35d, 2, true);
+        }
+
+        [Test]
+        public void PlaybackSession_SeekSupportsBackwardMovementAndMultipleStepSpeeds()
+        {
+            var intro = CreateClip(
+                "Intro",
+                FrameClipEndBehavior.HoldLastFrame,
+                1f,
+                100,
+                100);
+            var idle = CreateClip(
+                "Idle",
+                FrameClipEndBehavior.HoldLastFrame,
+                1f,
+                100,
+                100);
+            var plan = new ResolvedPlaybackPlan(
+                "Flow",
+                true,
+                new[]
+                {
+                    new ResolvedPlaybackStep(
+                        intro,
+                        "intro-node",
+                        2f,
+                        FrameClipEndBehavior.HoldLastFrame),
+                    new ResolvedPlaybackStep(
+                        idle,
+                        "idle-node",
+                        0.5f,
+                        FrameClipEndBehavior.Loop)
+                });
+            var session = new FrameAnimationPlaybackSession(plan);
+
+            AssertSeekFrame(session, 0.31d, 1, false);
+            Assert.That(session.CurrentClipId, Is.EqualTo(idle.Id));
+            Assert.That(session.CurrentNodeId, Is.EqualTo("idle-node"));
+
+            AssertSeekFrame(session, 0.5d, 0, false);
+            Assert.That(session.HasCompletedFirstTerminalLoopCycle, Is.True);
+
+            AssertSeekFrame(session, 0.05d, 1, false);
+            Assert.That(session.CurrentClipId, Is.EqualTo(intro.Id));
+            Assert.That(session.CurrentNodeId, Is.EqualTo("intro-node"));
+            Assert.That(session.HasCompletedFirstTerminalLoopCycle, Is.False);
+        }
+
+        [Test]
+        public void PlaybackSession_SeekHandlesLoopCyclesAndZeroSpeed()
+        {
+            var loop = CreateClip("Loop", FrameClipEndBehavior.Loop, 1f, 100, 200);
+            Assert.That(
+                FrameAnimationResolver.TryResolveClip(
+                    loop,
+                    default,
+                    out var loopPlan,
+                    out var loopError),
+                Is.True,
+                loopError.ToString());
+            var loopSession = new FrameAnimationPlaybackSession(loopPlan);
+
+            AssertSeekFrame(loopSession, 0.299d, 1, false);
+            Assert.That(loopSession.HasCompletedFirstTerminalLoopCycle, Is.False);
+            AssertSeekFrame(loopSession, 0.3d, 0, false);
+            Assert.That(loopSession.HasCompletedFirstTerminalLoopCycle, Is.True);
+            AssertSeekFrame(loopSession, 0.4d, 1, false);
+
+            var stopped = CreateClip("Stopped", FrameClipEndBehavior.Loop, 0f, 100, 100);
+            Assert.That(
+                FrameAnimationResolver.TryResolveClip(
+                    stopped,
+                    default,
+                    out var stoppedPlan,
+                    out var stoppedError),
+                Is.True,
+                stoppedError.ToString());
+            var stoppedSession = new FrameAnimationPlaybackSession(stoppedPlan);
+
+            AssertSeekFrame(stoppedSession, 100d, 0, false);
+            Assert.That(stoppedSession.HasCompletedFirstTerminalLoopCycle, Is.False);
+        }
+
+        [Test]
+        public void PlaybackSession_SeekLongClipAppliesOnlyResolvedFrame()
+        {
+            var clip = CreateClip(
+                "Long",
+                FrameClipEndBehavior.HoldLastFrame,
+                1f,
+                Enumerable.Repeat(10, 1000).ToArray());
+            Assert.That(
+                FrameAnimationResolver.TryResolveClip(
+                    clip,
+                    default,
+                    out var plan,
+                    out var error),
+                Is.True,
+                error.ToString());
+            var session = new FrameAnimationPlaybackSession(plan);
+            var applyCount = 0;
+
+            var evaluation = session.Seek(9.999d, _ => applyCount++);
+
+            Assert.That(evaluation.IsCompleted, Is.False);
+            Assert.That(session.CurrentFrameIndex, Is.EqualTo(999));
+            Assert.That(applyCount, Is.EqualTo(1));
+        }
+
        [Test]
        public void EndBehavior_NodeOverrideHasHighestPrecedence()
        {
@@ -180,6 +315,22 @@ namespace AibisDream.FrameAnimation.Tests.EditMode
            Assert.That(handle.Result.RequestId, Is.EqualTo(42));
        }

+        private static void AssertSeekFrame(
+            FrameAnimationPlaybackSession session,
+            double seconds,
+            int expectedFrameIndex,
+            bool expectedCompleted)
+        {
+            var applyCount = 0;
+            var evaluation = session.Seek(seconds, _ => applyCount++);
+            var snapshot = session.Snapshot;
+
+            Assert.That(evaluation.IsCompleted, Is.EqualTo(expectedCompleted));
+            Assert.That(snapshot.FrameIndex, Is.EqualTo(expectedFrameIndex));
+            Assert.That(snapshot.IsCompleted, Is.EqualTo(expectedCompleted));
+            Assert.That(applyCount, Is.EqualTo(1));
+        }
+
        private FrameClip CreateClip(
            string id,
            FrameClipEndBehavior endBehavior,
@@ -59,6 +59,97 @@ namespace AibisDream.FrameAnimation.Tests.PlayMode
            Assert.That(renderer.sprite, Is.SameAs(first));
        }

+        [UnityTest]
+        public IEnumerator Director_RespectsClipInSpeedMultiplierAndBackwardSeek()
+        {
+            var first = CreateSprite(Color.red);
+            var second = CreateSprite(Color.green);
+            var third = CreateSprite(Color.blue);
+            var clip = CreateClip(first, second, third);
+            var playerObject = Track(new GameObject("Timeline Time Mapping"));
+            var renderer = playerObject.AddComponent<SpriteRenderer>();
+            var player = playerObject.AddComponent<FrameClipPlayer>();
+            var setup = CreateTimeline(player, clip);
+            setup.Clip.clipIn = 0.1d;
+            setup.Clip.timeScale = 2d;
+
+            setup.Director.Play();
+            setup.Director.time = 0.025d;
+            setup.Director.Evaluate();
+            yield return null;
+
+            Assert.That(renderer.sprite, Is.SameAs(second));
+
+            setup.Director.time = 0.075d;
+            setup.Director.Evaluate();
+            Assert.That(renderer.sprite, Is.SameAs(third));
+
+            setup.Director.time = 0d;
+            setup.Director.Evaluate();
+            Assert.That(renderer.sprite, Is.SameAs(second));
+        }
+
+        [UnityTest]
+        public IEnumerator Director_ExtendedLoopClipWrapsAtSourceDuration()
+        {
+            var first = CreateSprite(Color.yellow);
+            var second = CreateSprite(Color.cyan);
+            var clip = CreateClip(FrameClipEndBehavior.Loop, first, second);
+            var playerObject = Track(new GameObject("Timeline Loop"));
+            var renderer = playerObject.AddComponent<SpriteRenderer>();
+            var player = playerObject.AddComponent<FrameClipPlayer>();
+            var setup = CreateTimeline(player, clip);
+            setup.Clip.duration = 0.6d;
+
+            setup.Director.Play();
+            setup.Director.time = 0.25d;
+            setup.Director.Evaluate();
+            yield return null;
+
+            Assert.That(renderer.sprite, Is.SameAs(first));
+
+            setup.Director.time = 0.35d;
+            setup.Director.Evaluate();
+            Assert.That(renderer.sprite, Is.SameAs(second));
+        }
+
+        [UnityTest]
+        public IEnumerator Director_AppliesClearAndHideTerminalBehaviors()
+        {
+            var clearObject = Track(new GameObject("Timeline Clear"));
+            var clearRenderer = clearObject.AddComponent<SpriteRenderer>();
+            var clearPlayer = clearObject.AddComponent<FrameClipPlayer>();
+            var clearSetup = CreateTimeline(
+                clearPlayer,
+                CreateClip(
+                    FrameClipEndBehavior.Clear,
+                    CreateSprite(Color.magenta)));
+
+            clearSetup.Director.Play();
+            clearSetup.Director.time = clearSetup.Clip.duration;
+            clearSetup.Director.Evaluate();
+            yield return null;
+
+            Assert.That(clearRenderer.enabled, Is.True);
+            Assert.That(clearRenderer.sprite, Is.Null);
+
+            var hideObject = Track(new GameObject("Timeline Hide"));
+            var hideRenderer = hideObject.AddComponent<SpriteRenderer>();
+            var hidePlayer = hideObject.AddComponent<FrameClipPlayer>();
+            var hideSetup = CreateTimeline(
+                hidePlayer,
+                CreateClip(
+                    FrameClipEndBehavior.HideTarget,
+                    CreateSprite(Color.white)));
+
+            hideSetup.Director.Play();
+            hideSetup.Director.time = hideSetup.Clip.duration;
+            hideSetup.Director.Evaluate();
+            yield return null;
+
+            Assert.That(hideRenderer.enabled, Is.False);
+        }
+
        private TimelineSetup CreateTimeline(FrameClipPlayer player, FrameClip clip)
        {
            var timeline = Track(ScriptableObject.CreateInstance<TimelineAsset>());
@@ -72,10 +163,17 @@ namespace AibisDream.FrameAnimation.Tests.PlayMode
            var director = directorObject.AddComponent<PlayableDirector>();
            director.playableAsset = timeline;
            director.SetGenericBinding(track, player);
-            return new TimelineSetup(director);
+            return new TimelineSetup(director, timelineClip);
        }

        private FrameClip CreateClip(params Sprite[] sprites)
+        {
+            return CreateClip(FrameClipEndBehavior.HoldLastFrame, sprites);
+        }
+
+        private FrameClip CreateClip(
+            FrameClipEndBehavior endBehavior,
+            params Sprite[] sprites)
        {
            var clip = Track(ScriptableObject.CreateInstance<FrameClip>());
            var frames = new List<FrameAnimationFrame>();
@@ -93,7 +191,7 @@ namespace AibisDream.FrameAnimation.Tests.PlayMode
                "Timeline",
                frames,
                1f,
-                FrameClipEndBehavior.HoldLastFrame);
+                endBehavior);
            return clip;
        }

@@ -116,12 +214,14 @@ namespace AibisDream.FrameAnimation.Tests.PlayMode

        private readonly struct TimelineSetup
        {
-            internal TimelineSetup(PlayableDirector director)
+            internal TimelineSetup(PlayableDirector director, TimelineClip clip)
            {
                Director = director;
+                Clip = clip;
            }

            internal PlayableDirector Director { get; }
+            internal TimelineClip Clip { get; }
        }
    }
 }