Chains N render passes inside one task: passes declares the count; each pass’s effect and parameters are flat keys like pass1_effect, pass1_intensity … (TaskParams is a flat map — nested structures don’t fit). Composite filters (2D Gaussian = horizontal + vertical; morphological open/close = erode + dilate) are expressed this way rather than as new composite task types.
Module：GPU render · Task type：render_pipeline
Ports
Inputs
| Port | Type | Required |
|---|---|---|
in | Image / cv::Mat | ✓ |
Outputs
| Port | Type | Required |
|---|---|---|
out | task_graph::Image | ✓ |
Parameters
| 参数 | 类型 | 默认值 | 范围 / 选项 | 说明 |
|---|---|---|---|---|
passes | int | 2 | [1, 64] | number of passes (1-64) |
width | int | 0 | [0, 65535] | output canvas width; 0 follows the input |
height | int | 0 | [0, 65535] | output canvas height; 0 follows the input |
effects_path | string | （空） | effect manifest (directory) path; empty for built-ins |
Example graph
A minimal runnable pipeline (read → process → write). Drag it into GraphStudio or open via --open; replace data/test.png with a real path.
{
"version": "2.0",
"tasks": [
{
"id": "read",
"type": "opencv_image_read",
"params": {
"file_path": "data/test.png"
}
},
{
"id": "node",
"type": "render_pipeline",
"params": {
"passes": 2,
"width": 0,
"height": 0
}
},
{
"id": "save",
"type": "opencv_image_write",
"params": {
"file_path": "out_out.png"
}
}
],
"edges": [
{
"from": "read",
"from_port": "out",
"to": "node",
"to_port": "in"
},
{
"from": "node",
"from_port": "out",
"to": "save",
"to_port": "in"
}
]
}
Notes
- pass{i}effect names the effect for each segment; other pass{i} keys pass through.
- Runnable example graphs live in
submodules/render/render_task/tests/graphs/.
Part of the GraphStudio node guide series; parameters reflect the latest release.