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UI_E_FP_OVERFLOW
The scope of UI_E_FP_OVERFLOW is Windows Animation Manager: animation arithmetic exceeded the representable floating-point range. Preserve 0x802A000B beside the returning call before cleanup or retry creates a more generic secondary failure.
Wrong turns
UI_E_PRIMITIVE_OUT_OF_BOUNDS is a timeline placement error; FP_OVERFLOW is representational arithmetic failure.
Do not merely clamp the final rendered value while leaving overflowing timing calculations intact.
Object and state
Windows Animation is a stateful COM subsystem. Animation variables, transitions and storyboards are created under a manager, scheduled against a monotonic animation time, updated before drawing, and eventually sealed or released. A visible glitch can therefore be downstream of a lifecycle, ownership, timeline, callback, or numeric contract failure.
Transition parameters, durations, slopes, repetition counts, and caller-provided values can combine into extreme intermediates. The failure is numeric even when the visible symptom is a missing frame or unscheduled storyboard.
Inspect the animation manager, storyboard, transition, timer, or callback that returned the HRESULT.
Capture before retry
- All numeric inputs in hexadecimal or full precision.
- First nonfinite intermediate.
- Duration and repetition configuration.
- Unit conversion and scaling path.
Controlled comparisons
| Control | Interpretation | Hold constant |
|---|---|---|
| Same operation, controlled environment | If the result follows one machine, account, volume, network, or device, environment matters. | Keep versions and identity explicit rather than comparing only the final message. |
Step-by-step investigation
- First: Validate isfinite on every external numeric input.
- Next: Run with identity scale and moderate durations.
- Then: Separate unit conversion from transition construction.
- Finally: Add boundary tests around the largest supported value.
Closure criteria
Closure requires the original supported range completes without overflow and deliberate out-of-range inputs fail before object construction; then repeat the next lifecycle operation to detect stale state.
Technical references
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