5a192b24
 杨鑫
最新同步
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export type ImageScaleMode = 'contain' | 'cover' | 'fill'
export function readImageScaleMode(cfg: Record<string, unknown> | undefined | null): ImageScaleMode {
const v = String(cfg?.scaleMode ?? cfg?.ScaleMode ?? 'contain')
.trim()
.toLowerCase()
if (v === 'cover' || v === 'fill') return v
return 'contain'
}
export function computeImageDrawRect(
boxW: number,
boxH: number,
sourceW: number,
sourceH: number,
scaleMode: string,
): { dx: number; dy: number; dw: number; dh: number } {
const mode = String(scaleMode ?? 'contain').trim().toLowerCase()
if (sourceW <= 0 || sourceH <= 0 || mode === 'fill') {
return { dx: 0, dy: 0, dw: boxW, dh: boxH }
}
const ratio =
mode === 'cover'
? Math.max(boxW / sourceW, boxH / sourceH)
: Math.min(boxW / sourceW, boxH / sourceH)
const dw = Math.max(1, Math.round(sourceW * ratio))
const dh = Math.max(1, Math.round(sourceH * ratio))
return {
dx: Math.round((boxW - dw) / 2),
dy: Math.round((boxH - dh) / 2),
dw,
dh,
}
}
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