frontend.yui · function ·
PresentYuiCanvasFlatDisplayListInViewport
Retained product hot path with one shared logical-to-window transform. The same yuiCanvasViewport can be inverted for input and applied to semantic bounds, keeping drawing, hit testing, and accessibility in one coordinate model without rebuilding or cloning the display list during resize.
Turn YUI models into a working frontend and its rendering/input adapters.
external PresentYuiCanvasFlatDisplayListInViewport(yuiDisplayList original displayList, yuiCompositionPlan original composition, yuiCanvasViewport viewport) returns boolStatus: source-declared
Parameters
yuiDisplayList original displayList- Supply display list as yuiDisplayList original.
yuiCompositionPlan original composition- Supply composition as yuiCompositionPlan original.
yuiCanvasViewport viewport- Supply viewport as yuiCanvasViewport.
Use PresentYuiCanvasFlatDisplayListInViewport
A complete small caller. Values are illustrative; check the returned result and package requirements before connecting live resources.
cpu · source-example · type checked
using frontend.yui
// Turn YUI models into a working frontend and its rendering/input adapters.
yuiDisplayList displayList = yuiDisplayList("surface Id")
yuiCompositionPlan composition = yuiCompositionPlan("surface Id")
yuiCanvasViewport viewport = yuiCanvasViewport(1, 1, 1, 1, 1, 1, 1)
bool result = PresentYuiCanvasFlatDisplayListInViewport(displayList, composition, viewport)
Console.Log(Text.From(result))
project.mech
manifestVersion = "2"
package = "api.example.frontend_yui__presentyuicanvasflatdisplaylistinviewport"
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"
Notes and source
Package presence and a declaration do not establish support on every host. Host services need their platform and lifecycle setup.
yeho/packages/frontend/yui/render-canvas.yh:1720