55 lines
1.2 KiB
Go
55 lines
1.2 KiB
Go
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// magickwand.go
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package main
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import (
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"math"
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"github.com/gographics/imagick/imagick"
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)
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func resizeImage(mw *imagick.MagickWand, newWidth, newHeight int, keepExactSize, center bool) (resmw *imagick.MagickWand) {
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var (
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width, height int
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)
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origHeight := int(mw.GetImageHeight())
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origWidth := int(mw.GetImageWidth())
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if (origHeight != newHeight) || (origWidth != newWidth) {
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if (round((origHeight / origWidth) * newWidth)) <= newHeight {
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height = round((float64(origHeight) / float64(origWidth))) * newWidth
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width = newWidth
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} else {
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width = round((float64(origWidth) / float64(origHeight))) * newHeight
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height = newHeight
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}
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} else {
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height = newHeight
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width = newWidth
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}
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if !keepExactSize {
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resmw.SetSize(width, height)
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center = false
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} else {
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resmw.SetSize(newWidth, newHeight)
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if center {
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err = mw.ResizeImage(width, height, imagick.FILTER_LANCZOS, 1)
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if err != nil {
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panic(err)
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}
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resmw.CompositeImage(mw, imagick.COMPOSITE_OP_SRC_OVER, uint((width-newWidth)/2), uint((height-newHeight)/2))
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} else {
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resmw.CompositeImage(mw, imagick.COMPOSITE_OP_SRC_OVER, 0, 0)
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}
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}
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mw.Destroy()
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return
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}
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func round(a float64) int {
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if a < 0 {
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return int(math.Ceil(a - 0.5))
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}
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return int(math.Floor(a + 0.5))
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}
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