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MILEFFECTSERR_OUTPUTSIZETOOLARGE
MILEFFECTSERR_OUTPUTSIZETOOLARGE identifies a failure in MIL oversized effect output. The effect graph calculated output bounds too large for the rendering path or resource limits. Investigation of this result should preserve the original object generation before cleanup, retry, or fallback creates a secondary result.
Capture before changing state
| Record | Why it matters here |
|---|---|
| Effect instance and owning graph or group identity | Comparing effect instance and owning graph or group identity shows whether this result follows input, object state, or environment. |
| Connector, input, child, listener, property, or transform involved | Preserving connector, input, child, listener, property, or transform involved provides the evidence needed to test this distinction: eMPTYBOUNDS indicates no drawable area; this result indicates an excessively large one. |
| Calculated input and output bounds | Recording calculated input and output bounds separates the MIL oversized effect output boundary from a later wrapper symptom. |
| Construction sequence and first method returning the HRESULT | In this result diagnostics, recording construction sequence and first method returning the HRESULT ties the HRESULT to the MIL oversized effect output boundary rather than to the final visible failure. |
Read the HRESULT in context
Oversized output is the opposite of empty output: bounds propagation remains nonempty but expands beyond the rendering path or resource limits. Blur radii, convolution kernels, scaling, DPI, and chained transforms can multiply dimensions or add margins at several nodes., the first node that crosses the accepted surface limit is more useful than the final allocation failure.
Inspect the following boundary: bounds propagation through transforms, kernels, blur radii, scaling, and intermediate surfaces.
A minimal test sequence
When it is returned, record width and height after every graph node, together with scale, kernel, radius, DPI, and device maximums. Reduce the dominant expansion parameter or process a smaller region; do not change clipping and device selection simultaneously.
- Reduce one expansion parameter at a time and compare the calculated rectangle with device limits.
- rebuild the smallest graph containing only the implicated node and one known input.
- When it is returned, log ownership changes and graph generation numbers.
- Validate the graph before allocating large intermediate resources.
Common wrong turns
EMPTYBOUNDS indicates no drawable area; it indicates an excessively large one. Do not catch the HRESULT and continue rendering with a partially connected graph; later failures can obscure the invariant that was first violated.
Three diagnostic branches
| Test | Interpretation | Hold constant |
|---|---|---|
| Same environment, reduced input | If it disappears with a smaller faithful case, complexity within MIL oversized effect output is implicated. | Keep effect instance and owning graph or group identity fixed while simplifying calculated input and output bounds. |
| Same input, fresh object generation | If it changes after rebuilding state, examine ownership across the effect instance, connector builder, graph owner, listener, and bounds calculator. | Place connector, input, child, listener, property, or transform involved on the timeline of the last successful transition. |
| Same operation on a controlled second path | If it follows one environment, the failure is not explained by source data alone. | Compare visual generation, effect registration, shader profile, rendering tier, and target dimensions while preserving construction sequence and first method returning the HRESULT. |
Regression verification
A correction for it should let the operation at the MIL oversized effect output boundary complete repeatedly under the original supported conditions. Repeat the control that begins with “Reduce one expansion parameter at a time and compare the calculated rectangle with device limits” and confirm that the following lifecycle step also succeeds. Keep the original failing sample and one deliberate negative case so fallback cannot be mistaken for repair.
Technical references
When it is returned, these references define the public API family, object model, or error list used to interpret this status.
- Microsoft Open Specifications: HRESULT values.
- Microsoft: WPF bitmap effects overview.
- Microsoft: PixelShader class.
- Microsoft: Direct2D custom effects.
- Microsoft: ID2D1TransformGraph.
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