PdfRoundedCornerShape

A Shape that produces correct vector PDF output for rounded rectangles with per-corner radii.

PdfRoundedCornerShape()

fun PdfRoundedCornerShape(
    topStart: Dp = 0.dp,
    topEnd: Dp = 0.dp,
    bottomEnd: Dp = 0.dp,
    bottomStart: Dp = 0.dp,
): Shape

Parameters

Parameter	Type	Default	Description
`topStart`	`Dp`	`0.dp`	Top-left corner radius
`topEnd`	`Dp`	`0.dp`	Top-right corner radius
`bottomEnd`	`Dp`	`0.dp`	Bottom-right corner radius
`bottomStart`	`Dp`	`0.dp`	Bottom-left corner radius

Returns

Shape – a PDF-safe shape. For non-uniform corners, produces an Outline.Generic with explicit bezier paths. For uniform corners, delegates to standard RoundedCornerShape.

Why this exists

Skia’s SVGCanvas serializes RoundRect clip paths as <rect rx="..." ry="...">, which only supports a single corner radius. When corners differ, the SVG loses the per-corner information and all corners render identically.

PdfRoundedCornerShape detects non-uniform corners and emits an explicit bezier <path d="..."> instead, preserving the full geometry in the PDF.

Example

Box(
    Modifier
        .size(100.dp)
        .clip(PdfRoundedCornerShape(topStart = 24.dp, bottomEnd = 24.dp))
        .background(Color.Blue)
)

Shape.asPdfSafe()

fun Shape.asPdfSafe(): Shape

Wraps any Shape to ensure asymmetric rounded rect outlines are emitted as explicit bezier paths. Returns the same shape if already wrapped.

Example

val myShape = RoundedCornerShape(topStart = 16.dp, bottomEnd = 16.dp)
Box(Modifier.clip(myShape.asPdfSafe()).background(Color.Green))

You only need PdfRoundedCornerShape when corners have different radii. For uniform corners (all the same), standard RoundedCornerShape works perfectly in PDF output.

PdfRoundedCornerShape