从golang图像获取像素数组 [英] Get a pixel array from from golang image.Image
问题描述
我需要以 [] byte
的形式获取像素数组,以将其传递给
I need to get a pixel array in the form of []byte
to be passed to the texImage2D
method of a Contex from the /mobile/gl package.
它需要一个像素阵列,其中每个像素的rgba值按从左到右,从上到下的像素顺序附加.目前,我已从文件加载图像.
It needs a pixel array where rgba values of each pixel is appended in the order of pixels left to right, top to bottom. Currently I have an image loaded from a file.
a, err := asset.Open("key.jpeg")
if err != nil {
log.Fatal(err)
}
defer a.Close()
img, _, err := image.Decode(a)
if err != nil {
log.Fatal(err)
}
我正在寻找类似 img.Pixels()
推荐答案
您可以简单地使用 img.At(x,y).RGBA()
来获取像素的RBGA值,只需将它们除以257就可以得到8位的表示形式.我建议您建立自己的二维像素阵列.这是一个可能的实现,请根据需要对其进行修改:
You can simply use img.At(x, y).RGBA()
to get the RBGA values for a pixel, you just need to divide them by 257 to get the 8 bit representation. I'd recommend building your own bi-dimensional array of pixels. Here's a possible implementation, modify it as needed:
package main
import (
"fmt"
"image"
"image/png"
"os"
"io"
"net/http"
)
func main() {
// You can register another format here
image.RegisterFormat("png", "png", png.Decode, png.DecodeConfig)
file, err := os.Open("./image.png")
if err != nil {
fmt.Println("Error: File could not be opened")
os.Exit(1)
}
defer file.Close()
pixels, err := getPixels(file)
if err != nil {
fmt.Println("Error: Image could not be decoded")
os.Exit(1)
}
fmt.Println(pixels)
}
// Get the bi-dimensional pixel array
func getPixels(file io.Reader) ([][]Pixel, error) {
img, _, err := image.Decode(file)
if err != nil {
return nil, err
}
bounds := img.Bounds()
width, height := bounds.Max.X, bounds.Max.Y
var pixels [][]Pixel
for y := 0; y < height; y++ {
var row []Pixel
for x := 0; x < width; x++ {
row = append(row, rgbaToPixel(img.At(x, y).RGBA()))
}
pixels = append(pixels, row)
}
return pixels, nil
}
// img.At(x, y).RGBA() returns four uint32 values; we want a Pixel
func rgbaToPixel(r uint32, g uint32, b uint32, a uint32) Pixel {
return Pixel{int(r / 257), int(g / 257), int(b / 257), int(a / 257)}
}
// Pixel struct example
type Pixel struct {
R int
G int
B int
A int
}
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