How to convert my PixelArray ?

[Mog]

Hello everyone, I've a project where I have to compress an image. Everything is ok except the displaying of the image (after decompression).
To have my pixelArray, I made:

struct Pixel
{
        uint8_t B, G, R;
};

Pixel** pixelArray = new Pixel*[bmpHeader.ImageWidth];
        for (int i = 0; i < bmpHeader.ImageWidth; ++i)
                pixelArray[i] = new Pixel[bmpHeader.ImageHeight];
 

Do not care about what is bmpHeader, that just give the size of the image.

Now I would like to display it with SFML, I think texture.update() would work fine but I don't know how to convert Pixel** to sf::Uint8*, and are we oblige to use rbga ? (because I don't use transparency)

Can you please tell me how  sf::Uint8* works ? Or even better, can you guide me to convert Pixel** to  sf::Uint8* ?

Thanks a lot !

[Hapax]

Just thinking aloud here. Could you do something like:

sf::Image image(bmpHeader.ImageWidth, bmpHeader.ImageHeight);

and then use setPixel() to modify each pixel based on pixel.
Maybe something like:

image.setPixel(sf::Color(pixel.r, pixel.g, pixel.b));

or equivalent, modifying to accommodate pointer usage.

Then, to create a texture, it's just:

sf::Texture texture;
if (!image.loadFromImage(image))
    return errorCode;

The reason I suggest this method is because your pixels are stored in a different format (type Pixel) to how sfml seems to require (type sf::Color) and would need conversion.

Can you please tell me how  sf::Uint8* works ?

sf::Uint8 is an 8-bit unsigned integer (actually it's an unsigned char - a byte: 0-255)

EDIT: Corrected setPixel's link.

[Mog]

Awesome, thanks a lot ! 

[Hapax]

You're welcome. Glad I could help