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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. 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 it 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.
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 this result 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 | 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 this result 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 this result disappears with a smaller faithful case, complexity within Direct2D custom-effect transform graphs is implicated. | Keep transform node type and GetInputCount result fixed while simplifying effect input count and graph mapping. |
| Same input, fresh object generation | If this result 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. | Place number of connected edges on the timeline of the last successful transition. |
| Same operation on a controlled second path | If this result follows one environment, the failure is not explained by source data alone. | 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
Build one pass-through node, validate it, and add one node or edge per step., log input count, edge endpoints, effect-input mapping, output selection, and topological order before committing the graph.
- When it is returned, reduce the node to documented input count.
- Combine sources in staged nodes.
- validate counts before AddNode and ConnectNode.
- When it is returned, use a pass-through graph as baseline.
Closure criteria
A correction for it 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. 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: Direct2D error codes.
- Microsoft: Direct2D custom effects.
- Microsoft: ID2D1TransformGraph.
- Microsoft: Direct2D effect properties.
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