90 lines
2.5 KiB
Go
90 lines
2.5 KiB
Go
// PresentationApp project imagick.go
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package main
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import (
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"image"
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. "math"
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"gopkg.in/gographics/imagick.v2/imagick"
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)
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/*resizeImage() mw fullsize image
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newwidth, newheight = size to be resized to
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keepSpecSize = return image with exactly the size specified or just the size of the resized image
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center = senter the image
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*/
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func resizeImage(mw *imagick.MagickWand, newWidth, newHeight int, keepSpecSize, center bool) (resmw *imagick.MagickWand) {
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var (
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width, height, origHeight, origWidth 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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//check if requested size is the same as current size
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if (origHeight != newHeight) || (origWidth != newWidth) {
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// width / height * newheight = newwidth
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if (round((float64(origWidth) / float64(origHeight)) * float64(newHeight))) <= newWidth {
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width = round((float64(origWidth) / float64(origHeight)) * float64(newHeight))
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height = newHeight
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} else {
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// height / width * newwidth = newheight
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height = round((float64(origHeight) / float64(origWidth)) * float64(newWidth))
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width = newWidth
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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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//new magickwand for resized image
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resmw = imagick.NewMagickWand()
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if !keepSpecSize {
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resmw.NewImage(uint(width), uint(height), imagick.NewPixelWand())
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center = false
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} else {
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//blank image
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resmw.NewImage(uint(newWidth), uint(newHeight), imagick.NewPixelWand())
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if center {
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err = mw.ResizeImage(uint(width), uint(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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//centers image
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resmw.CompositeImage(mw, imagick.COMPOSITE_OP_SRC_OVER, round(float64(newWidth-width)/float64(2)), round(float64(newHeight-height)/float64(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 resmw
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}
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//getImage() from imagick to image.RGBA
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func (cl cell) getImage(width, height int) (img *image.RGBA) {
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mw := cl.img.GetImage()
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if (width == 0) || (height == 0) {
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width = int(mw.GetImageWidth())
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height = int(mw.GetImageHeight())
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}
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mw = resizeImage(mw, width, height, true, true)
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img = image.NewRGBA(image.Rect(0, 0, int(width), int(height)))
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if img.Stride != img.Rect.Size().X*4 {
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panic("unsupported stride")
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}
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Tpix, _ := mw.ExportImagePixels(0, 0, uint(width), uint(height), "RGBA", imagick.PIXEL_CHAR)
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img.Pix = Tpix.([]uint8)
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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(Ceil(a - 0.5))
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}
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return int(Floor(a + 0.5))
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}
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