mirror of https://github.com/mindoc-org/mindoc.git
52 lines
1.4 KiB
Go
52 lines
1.4 KiB
Go
package graphics
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import (
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"errors"
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"image"
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"os"
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"github.com/nfnt/resize"
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)
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func ImageCopy(src image.Image, x, y, w, h int) (image.Image, error) {
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var subImg image.Image
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if rgbImg, ok := src.(*image.YCbCr); ok {
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subImg = rgbImg.SubImage(image.Rect(x, y, x+w, y+h)).(*image.YCbCr) //图片裁剪x0 y0 x1 y1
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} else if rgbImg, ok := src.(*image.RGBA); ok {
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subImg = rgbImg.SubImage(image.Rect(x, y, x+w, y+h)).(*image.RGBA) //图片裁剪x0 y0 x1 y1
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} else if rgbImg, ok := src.(*image.NRGBA); ok {
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subImg = rgbImg.SubImage(image.Rect(x, y, x+w, y+h)).(*image.NRGBA) //图片裁剪x0 y0 x1 y1
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} else if rgbImg, ok := src.(*image.Paletted); ok {
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subImg = rgbImg.SubImage(image.Rect(x, y, x+w, y+h)).(*image.Paletted) //图片裁剪x0 y0 x1 y1
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} else {
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return subImg, errors.New("图片解码失败")
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}
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return subImg, nil
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}
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func ImageCopyFromFile(p string, x, y, w, h int) (image.Image, error) {
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var src image.Image
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file, err := os.Open(p)
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if err != nil {
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return src, err
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}
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defer file.Close()
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src, _, err = image.Decode(file)
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return ImageCopy(src, x, y, w, h)
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}
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func ImageResize(src image.Image, w, h int) image.Image {
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return resize.Resize(uint(w), uint(h), src, resize.Lanczos3)
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}
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func ImageResizeSaveFile(src image.Image, width, height int, p string) error {
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dst := resize.Resize(uint(width), uint(height), src, resize.Lanczos3)
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return SaveImage(p, dst)
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}
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