CODEWITHSUNDEEP
javajavafx
Pavel
Pavel

Reputation: 1

How do I use PixelReader's getPixels() method?

How do I convert a javafx.scene.image.Image to a byte array in the format bgra?

I tried doing:

PixelReader pixelReader = img.getPixelReader();
int width = (int)img.getWidth();
int height = (int)img.getHeight();
byte[] buffer = new byte[width * height * 4];
pixelReader.getPixels(
        0,
        0,
        width,
        height,
        PixelFormat.getByteBgraInstance(),
        buffer,
        0,
        width
);

but it didn't work, my byte[] array buffer is still filled with zeros.

Upvotes: 4

Views: 2512

Answers (1)

Roland
Roland

Reputation: 18415

The scanlineStride i. e. width must be multiplied by 4, i. e.

PixelReader pixelReader = img.getPixelReader();
int width = (int)img.getWidth();
int height = (int)img.getHeight();
byte[] buffer = new byte[width * height * 4];
pixelReader.getPixels(
        0,
        0,
        width,
        height,
        PixelFormat.getByteBgraInstance(),
        buffer,
        0,
        width * 4
);

Upvotes: 3

Related Questions