Method calcSizes

processing/prepare.go:175–221

(widthToScale, heightToScale int, po ProcessingOptions)

}

func (c *Context) calcSizes(widthToScale, heightToScale int, po ProcessingOptions) {
	c.TargetWidth = imath.Scale(po.Width(), c.DprScale*po.ZoomWidth())
	c.TargetHeight = imath.Scale(po.Height(), c.DprScale*po.ZoomHeight())

	c.ScaledWidth = imath.Scale(widthToScale, c.WScale)
	c.ScaledHeight = imath.Scale(heightToScale, c.HScale)

	if po.ResizingType() == ResizeFillDown && !po.Enlarge() {
		diffW := float64(c.TargetWidth) / float64(c.ScaledWidth)
		diffH := float64(c.TargetHeight) / float64(c.ScaledHeight)

		switch {
		case diffW > diffH && diffW > 1.0:
			c.ResultCropHeight = imath.Scale(c.ScaledWidth, float64(c.TargetHeight)/float64(c.TargetWidth))
			c.ResultCropWidth = c.ScaledWidth

		case diffH > diffW && diffH > 1.0:
			c.ResultCropWidth = imath.Scale(c.ScaledHeight, float64(c.TargetWidth)/float64(c.TargetHeight))
			c.ResultCropHeight = c.ScaledHeight

		default:
			c.ResultCropWidth = c.TargetWidth
			c.ResultCropHeight = c.TargetHeight
		}
	} else {
		c.ResultCropWidth = c.TargetWidth
		c.ResultCropHeight = c.TargetHeight
	}

	if po.ExtendAspectRatioEnabled() && c.TargetWidth > 0 && c.TargetHeight > 0 {
		outWidth := imath.MinNonZero(c.ScaledWidth, c.ResultCropWidth)
		outHeight := imath.MinNonZero(c.ScaledHeight, c.ResultCropHeight)

		diffW := float64(c.TargetWidth) / float64(outWidth)
		diffH := float64(c.TargetHeight) / float64(outHeight)

		switch {
		case diffH > diffW:
			c.ExtendAspectRatioHeight = imath.Scale(outWidth, float64(c.TargetHeight)/float64(c.TargetWidth))
			c.ExtendAspectRatioWidth = outWidth

		case diffW > diffH:
			c.ExtendAspectRatioWidth = imath.Scale(outHeight, float64(c.TargetWidth)/float64(c.TargetHeight))
			c.ExtendAspectRatioHeight = outHeight
		}
	}
}

func (c *Context) limitScale(widthToScale, heightToScale int, po ProcessingOptions) {
	maxresultDim := c.PO.MaxResultDimension()