69 lines
1.5 KiB
Go
69 lines
1.5 KiB
Go
package vidio
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import (
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"image"
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"os"
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"strings"
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"image/color"
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"image/jpeg"
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_ "image/jpeg"
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"image/png"
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_ "image/png"
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)
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// Reads an image from a file. Currently only supports png and jpeg.
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func Read(filename string) (int, int, []byte) {
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f, err := os.Open(filename)
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if err != nil {
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panic(err)
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}
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defer f.Close()
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image, _, err := image.Decode(f)
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if err != nil {
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panic(err)
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}
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bounds := image.Bounds().Max
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data := make([]byte, bounds.Y*bounds.X*3)
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index := 0
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for h := 0; h < bounds.Y; h++ {
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for w := 0; w < bounds.X; w++ {
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r, g, b, _ := image.At(w, h).RGBA()
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r, g, b = r/256, g/256, b/256
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data[index] = byte(r)
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index++
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data[index] = byte(g)
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index++
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data[index] = byte(b)
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index++
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}
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}
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return bounds.X, bounds.Y, data
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}
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// Writes an image to a file. Currently only supports png and jpeg.
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func Write(filename string, width, height int, data []byte) {
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f, err := os.Create(filename)
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if err != nil {
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panic(err)
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}
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defer f.Close()
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image := image.NewRGBA(image.Rect(0, 0, width, height))
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index := 0
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for h := 0; h < height; h++ {
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for w := 0; w < width; w++ {
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r, g, b := data[index], data[index+1], data[index+2]
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image.Set(w, h, color.RGBA{r, g, b, 255})
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index += 3
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}
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}
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if strings.HasSuffix(filename, ".png") {
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if err := png.Encode(f, image); err != nil {
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panic(err)
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}
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} else if strings.HasSuffix(filename, ".jpg") || strings.HasSuffix(filename, ".jpeg") {
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if err := jpeg.Encode(f, image, nil); err != nil {
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panic(err)
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}
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}
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}
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