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D2DERR_TOO_MANY_TRANSFORM_INPUTS
The scope of D2DERR_TOO_MANY_TRANSFORM_INPUTS is Direct2D custom-effect transform graphs. A custom effect attempted to use a transform node with more inputs than Direct2D permits. Keep 0x8899002D beside the returning method because a wrapper can replace this distinction with a generic subsystem message.
Misleading responses
TOO_MANY_SHADER_ELEMENTS concerns shader complexity; TOO_MANY_TRANSFORM_INPUTS concerns graph node arity. For D2DERR_TOO_MANY_TRANSFORM_INPUTS, do not respond with a universal render-target recreation loop unless the returned status specifically documents device-loss recovery; graph, property, numeric, lifetime, and print-state errors require correcting their contract.
Locate the first rejecting layer
When D2DERR_TOO_MANY_TRANSFORM_INPUTS is returned, a transform graph must have valid node identities, supported input counts, complete input mappings, one reachable output, and no cycles. Public graph configuration errors usually point to caller construction; an internal graph error warrants preserving a minimal valid-looking graph and runtime evidence rather than inventing a missing public rule in the D2DERR_TOO_MANY_TRANSFORM_INPUTS path.
For D2DERR_TOO_MANY_TRANSFORM_INPUTS, inspect the following boundary: iD2D1TransformNode input count and graph connections.
Evidence that changes the diagnosis
| Record | Why it matters here |
|---|---|
| Transform node type and GetInputCount result | Comparing transform node type and GetInputCount result shows whether D2DERR_TOO_MANY_TRANSFORM_INPUTS follows input, object state, or environment. |
| Number of connected edges | Preserving number of connected edges provides the evidence needed to test this distinction: tOO_MANY_SHADER_ELEMENTS concerns shader complexity; TOO_MANY_TRANSFORM_INPUTS concerns graph node arity. |
| Effect input count and graph mapping | For D2DERR_TOO_MANY_TRANSFORM_INPUTS, recording effect input count and graph mapping separates the Direct2D custom-effect transform graphs boundary from a later wrapper symptom. |
| Custom effect Initialize sequence | In D2DERR_TOO_MANY_TRANSFORM_INPUTS diagnostics, recording custom effect Initialize sequence ties the HRESULT to the Direct2D custom-effect transform graphs boundary rather than to the final visible failure. |
Comparison tests
| Test | Interpretation | Hold constant |
|---|---|---|
| Same environment, reduced input | If D2DERR_TOO_MANY_TRANSFORM_INPUTS disappears with a smaller faithful case, complexity within Direct2D custom-effect transform graphs is implicated. | For D2DERR_TOO_MANY_TRANSFORM_INPUTS, keep transform node type and GetInputCount result fixed while simplifying effect input count and graph mapping. |
| Same input, fresh object generation | If D2DERR_TOO_MANY_TRANSFORM_INPUTS changes after rebuilding state, examine ownership across the caller’s object graph, custom effect or renderer, Direct2D validation layer, backing device, and deferred draw boundary. | For D2DERR_TOO_MANY_TRANSFORM_INPUTS, place number of connected edges on the timeline of the last successful transition. |
| Same operation on a controlled second path | If D2DERR_TOO_MANY_TRANSFORM_INPUTS follows one environment, the failure is not explained by source data alone. | For D2DERR_TOO_MANY_TRANSFORM_INPUTS, compare adapter and feature level, factory and device generations, target identity, debug-layer output, and thread ownership while preserving custom effect Initialize sequence. |
Controlled reproduction
For D2DERR_TOO_MANY_TRANSFORM_INPUTS, build one pass-through node, validate it, and add one node or edge per step. When D2DERR_TOO_MANY_TRANSFORM_INPUTS is returned, log input count, edge endpoints, effect-input mapping, output selection, and topological order before committing the graph.
- When D2DERR_TOO_MANY_TRANSFORM_INPUTS is returned, reduce the node to documented input count.
- Combine sources in staged nodes in the D2DERR_TOO_MANY_TRANSFORM_INPUTS path.
- For D2DERR_TOO_MANY_TRANSFORM_INPUTS, validate counts before AddNode and ConnectNode.
- When D2DERR_TOO_MANY_TRANSFORM_INPUTS is returned, use a pass-through graph as baseline.
Closure criteria
A correction for D2DERR_TOO_MANY_TRANSFORM_INPUTS should let the operation at the Direct2D custom-effect transform graphs boundary complete repeatedly under the original supported conditions. Repeat the control that begins with “Reduce the node to documented input count” and confirm that the following lifecycle step also succeeds. For D2DERR_TOO_MANY_TRANSFORM_INPUTS, keep the original failing sample and one deliberate negative case so fallback cannot be mistaken for repair.
Technical references
When D2DERR_TOO_MANY_TRANSFORM_INPUTS is returned, these references define the public API family, object model, or error list used to interpret this status.
- Microsoft: Direct2D error codes.
- Microsoft: Direct2D custom effects.
- Microsoft: ID2D1TransformGraph.
- Microsoft: Direct2D effect properties.
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