Function computeScale

packages/client/src/features/viewport/viewportMath.ts:210–236

(
  canvasSize: Size | null,
  deviceNaturalSize: Size | null,
  marginX: number,
  marginY: number,
  chromeProfile: ChromeProfile | null,
  reservedBottomInset = 0,
  rotationQuarterTurns = 0,
)

}

function computeScale(
  canvasSize: Size | null,
  deviceNaturalSize: Size | null,
  marginX: number,
  marginY: number,
  chromeProfile: ChromeProfile | null,
  reservedBottomInset = 0,
  rotationQuarterTurns = 0,
): number {
  if (!canvasSize) {
    return 1;
  }
  const totalSize = shellSize(
    deviceNaturalSize,
    chromeProfile,
    rotationQuarterTurns,
  );
  const availableWidth = Math.max(canvasSize.width - marginX * 2, 0);
  const availableHeight = Math.max(
    canvasSize.height - marginY * 2 - reservedBottomInset,
    0,
  );
  return Math.min(
    availableWidth / totalSize.width,
    availableHeight / totalSize.height,
  );
}

export function computeFitScale(
  canvasSize: Size | null,