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utils.go
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/
utils.go
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package images
import (
"bytes"
"image"
"image/draw"
_ "image/gif"
_ "image/jpeg"
"image/png"
"io"
"github.com/HardDie/DeckBuilder/internal/errors"
)
func ValidateImage(input []byte) (string, error) {
_, imgType, err := image.Decode(bytes.NewBuffer(input))
if err != nil {
return "", errors.UnknownImageType.AddMessage(err.Error())
}
return imgType, nil
}
func CreateImage(width, height int) *image.RGBA {
return image.NewRGBA(image.Rect(0, 0, width, height))
}
func Draw(dst *image.RGBA, col, row int, src image.Image) {
pos := image.Rect(
col*src.Bounds().Dx(), // Start X
row*src.Bounds().Dy(), // Start Y
col*src.Bounds().Dx()+src.Bounds().Dx(), // End X
row*src.Bounds().Dy()+src.Bounds().Dy(), // End Y
)
draw.Draw(dst, pos, src, image.Point{}, draw.Src)
}
func ImageSize(data []byte) (width, height int, err error) {
img, err := ImageFromBinary(data)
if err != nil {
return
}
bound := img.Bounds().Max
width = bound.X
height = bound.Y
return
}
func ImageFromReader(r io.Reader) (image.Image, error) {
img, _, err := image.Decode(r)
if err != nil {
return nil, err
}
return img, nil
}
func ImageFromBinary(data []byte) (image.Image, error) {
return ImageFromReader(bytes.NewReader(data))
}
func SaveToWriter(w io.Writer, img image.Image) error {
err := png.Encode(w, img)
if err != nil {
return err
}
return nil
}