func (i *Image) sizeFrames(sz *imgry.Sizing) error {
var canvas *imagick.MagickWand
var bg *imagick.PixelWand
// Shortcut if there is nothing to size
if sz.Size.Equal(imgry.ZeroRect) && sz.CropBox.Equal(imgry.ZeroFloatingRect) {
return nil
}
coalesceAndDeconstruct := !sz.Flatten && i.mw.GetNumberImages() > 1
if coalesceAndDeconstruct {
i.mw = i.mw.CoalesceImages()
}
if sz.Canvas != nil {
// If the user requested a canvas.
canvas = imagick.NewMagickWand()
bg = imagick.NewPixelWand()
bg.SetColor("transparent")
defer func() {
bg.Destroy()
if canvas != nil && canvas != i.mw {
canvas.Destroy()
}
}()
}
i.mw.SetFirstIterator()
for n := true; n; n = i.mw.NextImage() {
pw, ph := int(i.mw.GetImageWidth()), int(i.mw.GetImageHeight())
srcSize := imgry.NewRect(pw, ph)
// Initial crop of the source image
cropBox, cropOrigin, err := sz.CalcCropBox(srcSize)
if err != nil {
return err
}
if cropBox != nil && cropOrigin != nil && !cropBox.Equal(imgry.ZeroRect) {
err := i.mw.CropImage(uint(cropBox.Width), uint(cropBox.Height), cropOrigin.X, cropOrigin.Y)
if err != nil {
return err
}
srcSize = cropBox
i.mw.ResetImagePage("")
}
// Resize the image
resizeRect, cropBox, cropOrigin := sz.CalcResizeRect(srcSize)
if resizeRect != nil && !resizeRect.Equal(imgry.ZeroRect) {
err := i.mw.ResizeImage(uint(resizeRect.Width), uint(resizeRect.Height), imagick.FILTER_LANCZOS, 1.0)
if err != nil {
return err
}
i.mw.ResetImagePage("")
}
// Perform any final crops from an operation
if cropBox != nil && cropOrigin != nil && !cropBox.Equal(imgry.ZeroRect) {
err := i.mw.CropImage(uint(cropBox.Width), uint(cropBox.Height), cropOrigin.X, cropOrigin.Y)
if err != nil {
return err
}
i.mw.ResetImagePage("")
}
// If we have a canvas we put the image at its center.
if canvas != nil {
canvas.NewImage(uint(sz.Canvas.Width), uint(sz.Canvas.Height), bg)
canvas.SetImageBackgroundColor(bg)
canvas.SetImageFormat(i.mw.GetImageFormat())
x := (sz.Canvas.Width - int(i.mw.GetImageWidth())) / 2
y := (sz.Canvas.Height - int(i.mw.GetImageHeight())) / 2
canvas.CompositeImage(i.mw, imagick.COMPOSITE_OP_OVER, x, y)
canvas.ResetImagePage("")
}
if sz.Flatten {
break
}
}
if canvas != nil {
i.mw.Destroy()
i.mw = canvas
}
if coalesceAndDeconstruct {
// Compares each frame of the image, removes pixels that are already on the
// background and updates offsets accordingly.
i.mw = i.mw.DeconstructImages()
}
return nil
}