# yuiPersistentCanvasExecutionV1

A yui persistent canvas execution v1 record carrying rendered, presented, damageCount, replayedCommandCount, redrawBefore, and related state.

Last updated: 2026-09-09

Package: frontend.yui | Status: source-declared

Tags: cpu, frontend, frontend.yui, method, source-example, thing, yeho, yui

Turn YUI models into a working frontend and its rendering/input adapters.

```yh
external thing yuiPersistentCanvasExecutionV1
```

- bool rendered: Stores rendered as bool.
- bool presented: Stores presented as bool.
- int damageCount: Stores damage count as int.
- int replayedCommandCount: Stores replayed command count as int.
- int redrawBefore: Stores redraw before as int.
- int redrawAfter: Stores redraw after as int.
- int presentBefore: Stores present before as int.
- int presentAfter: Stores present after as int.
- text diagnostic: Stores diagnostic as text.
- yuiPersistentCanvasExecutionV1(text diagnostic): Yui persistent canvas execution v1.
- RedrawDelta() returns int: Redraw delta.
- PresentDelta() returns int: Present delta.

## Use yuiPersistentCanvasExecutionV1

A complete small caller. Values are illustrative; check the returned result and package requirements before connecting live resources.

Verification: type checked

```yh
using frontend.yui

// Turn YUI models into a working frontend and its rendering/input adapters.
yuiPersistentCanvasExecutionV1 sample = yuiPersistentCanvasExecutionV1("diagnostic")
Console.Log(Text.From(sample.rendered))

```

Save this beside start.yh as project.mech:

```toml
manifestVersion = "2"
package = "api.example.frontend_yui__yuipersistentcanvasexecutionv1"
version = "0.1.0"
languageEdition = "yeho-core-2026.1"

[app]
kind = "headless"

[[dependencies]]
package = "frontend.yui"
version = "0.2.0"
path = "../../../yeho/packages/frontend/yui"

[[dependencies]]
package = "graphics.canvas"
version = "0.1.0"
path = "../../../yeho/packages/graphics/canvas"

[[dependencies]]
package = "graphics.image"
version = "0.1.0"
path = "../../../yeho/packages/graphics/image"

[[dependencies]]
package = "graphics.image.processing"
version = "0.1.0"
path = "../../../yeho/packages/graphics/image/processing"

[[dependencies]]
package = "graphics.text"
version = "0.1.0"
path = "../../../yeho/packages/graphics/text"

[[dependencies]]
package = "host.ui_services"
version = "0.1.0"
path = "../../../yeho/packages/host/ui_services"

[[dependencies]]
package = "input.text"
version = "0.1.0"
path = "../../../yeho/packages/input/text"

[[dependencies]]
package = "ui"
version = "0.2.0"
path = "../../../yeho/packages/ui"

```

Extract the example archive beside the yeho and dolphin checkouts. This example requires those source dependencies and a current developer compiler.

```sh
./yeho/build/dolphin-metal/yehoc ./api-examples/frontend.yui--yuiPersistentCanvasExecutionV1/usage --backend cpu-oracle -o /tmp/yeho-example
/tmp/yeho-example
```


## yuiPersistentCanvasExecutionV1.RedrawDelta

A complete caller for this public method. Sample inputs are illustrative; native resources require their owning lifecycle.

Verification: type checked

```yh
using frontend.yui

// Redraw delta.
yuiPersistentCanvasExecutionV1 instance = yuiPersistentCanvasExecutionV1("diagnostic")
int result = instance.RedrawDelta()
Console.Log(Text.From(result))

```

Save this beside start.yh as project.mech:

```toml
manifestVersion = "2"
package = "api.example.frontend_yui__yuipersistentcanvasexecutionv1"
version = "0.1.0"
languageEdition = "yeho-core-2026.1"

[app]
kind = "headless"

[[dependencies]]
package = "frontend.yui"
version = "0.2.0"
path = "../../../yeho/packages/frontend/yui"

[[dependencies]]
package = "graphics.canvas"
version = "0.1.0"
path = "../../../yeho/packages/graphics/canvas"

[[dependencies]]
package = "graphics.image"
version = "0.1.0"
path = "../../../yeho/packages/graphics/image"

[[dependencies]]
package = "graphics.image.processing"
version = "0.1.0"
path = "../../../yeho/packages/graphics/image/processing"

[[dependencies]]
package = "graphics.text"
version = "0.1.0"
path = "../../../yeho/packages/graphics/text"

[[dependencies]]
package = "host.ui_services"
version = "0.1.0"
path = "../../../yeho/packages/host/ui_services"

[[dependencies]]
package = "input.text"
version = "0.1.0"
path = "../../../yeho/packages/input/text"

[[dependencies]]
package = "ui"
version = "0.2.0"
path = "../../../yeho/packages/ui"

```

Extract the example archive beside the yeho and dolphin checkouts. This example requires those source dependencies and a current developer compiler.

```sh
./yeho/build/dolphin-metal/yehoc ./api-examples/frontend.yui--yuiPersistentCanvasExecutionV1/method-RedrawDelta-10 --backend cpu-oracle -o /tmp/yeho-example
/tmp/yeho-example
```


## yuiPersistentCanvasExecutionV1.PresentDelta

A complete caller for this public method. Sample inputs are illustrative; native resources require their owning lifecycle.

Verification: type checked

```yh
using frontend.yui

// Present delta.
yuiPersistentCanvasExecutionV1 instance = yuiPersistentCanvasExecutionV1("diagnostic")
int result = instance.PresentDelta()
Console.Log(Text.From(result))

```

Save this beside start.yh as project.mech:

```toml
manifestVersion = "2"
package = "api.example.frontend_yui__yuipersistentcanvasexecutionv1"
version = "0.1.0"
languageEdition = "yeho-core-2026.1"

[app]
kind = "headless"

[[dependencies]]
package = "frontend.yui"
version = "0.2.0"
path = "../../../yeho/packages/frontend/yui"

[[dependencies]]
package = "graphics.canvas"
version = "0.1.0"
path = "../../../yeho/packages/graphics/canvas"

[[dependencies]]
package = "graphics.image"
version = "0.1.0"
path = "../../../yeho/packages/graphics/image"

[[dependencies]]
package = "graphics.image.processing"
version = "0.1.0"
path = "../../../yeho/packages/graphics/image/processing"

[[dependencies]]
package = "graphics.text"
version = "0.1.0"
path = "../../../yeho/packages/graphics/text"

[[dependencies]]
package = "host.ui_services"
version = "0.1.0"
path = "../../../yeho/packages/host/ui_services"

[[dependencies]]
package = "input.text"
version = "0.1.0"
path = "../../../yeho/packages/input/text"

[[dependencies]]
package = "ui"
version = "0.2.0"
path = "../../../yeho/packages/ui"

```

Extract the example archive beside the yeho and dolphin checkouts. This example requires those source dependencies and a current developer compiler.

```sh
./yeho/build/dolphin-metal/yehoc ./api-examples/frontend.yui--yuiPersistentCanvasExecutionV1/method-PresentDelta-11 --backend cpu-oracle -o /tmp/yeho-example
/tmp/yeho-example
```


Package presence and a declaration do not establish support on every host. Host services need their platform and lifecycle setup.

Source: yeho/packages/frontend/yui/render-persistent_canvas.yh

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