Some image manipulation functions don't work

[Yeffian]

I'm writing a game engine using Jaylib, and some of the image manipulation functions, such as:

void ImageFlipVertical(Image image);                                                        
void ImageFlipHorizontal(Image image);                                                           
void ImageRotateCW(Image image);                                                                 
void ImageRotateCCW(Image image);                                                                
void ImageColorTint(Image image, Color color);                                                   
void ImageColorInvert(Image image);                                                           
void ImageColorGrayscale(Image image);

Don't work. The image resizing functions do work, but these ones don't. I checked the docs, and im using them correctly, so im not exactly sure why it isnt working. This is my code:

public class Sprite {
    @Getter
    private String path;

    @Getter
    private Image img;

    @Getter
    private Texture rawTex;

    public Sprite(String path) {
        this.path = path;
        this.img = LoadImage(path);
        this.rawTex = LoadTextureFromImage(img);
    }

    public void flip() {
        ImageFlipVertical(img);
    }

    public void resize(Vector2f newSize) {
        // Use nearest neighbour scaling algorithm instead of the default bicubic scaling algorithm
        // https://en.wikipedia.org/wiki/Nearest-neighbor_interpolation
        ImageResizeNN(this.img, (int) newSize.x, (int) newSize.y);

        // reload the texture after resizing
        this.rawTex = LoadTextureFromImage(this.img);
    }

    public void resizeBicubic(Vector2f newSize) {
        // Raylib uses the bicubic resizing algorithm by default
        // https://en.wikipedia.org/wiki/Bicubic_interpolation
        ImageResize(this.img, (int) newSize.x, (int) newSize.y);

        // reload the texture after resizing
        this.rawTex = LoadTextureFromImage(this.img);
    }

    public void dispose() {
        UnloadImage(img);
        UnloadTexture(rawTex);
    }
}

and the sprite.flip() function isn't changing anything in the image.

[electronstudio]

You havent done this.rawTex = LoadTextureFromImage(this.img); in flip() so you wont see any difference.

[Yeffian]

Ohh, I see, I dont know how i missed that 😓 . I need to do this for all the image functions right?

[electronstudio]

Yes. Images are stored in RAM and can be manipulated with CPU. Textures are stored in VRAM from where the GPU draws them to the screen. If you modify an image in RAM it won't change the texture in VRAM until you upload it to the GPU again.

This is basic OpenGL stuff and nothing to do with Java so you'd probably get better help asking on the Raylib Discord.

[Yeffian]

Ah, makes sense, thanks!