How to create image

[zaichenhu]

when I use Image2D to create a new image, the parameter always needs Array Char type, but how to use integer or float as an input, so what's the best practice to create an image with magnum?

[Squareys]

You can allocate the data and then use .pixels<T>() to type cast the char data to some pixel type, e.g.:

    constexpr Vector2i size{2, 2};
    Image2D image{{}, PixelFormat::RGBA32UI, size,
        Containers::Array<char>{NoInit, size.product()*sizeof(UnsignedInt)*4}};
    auto pixels = image.pixels<Vector4ui>();
    
    const int x = 0;
    const int y = 1:
    pixels[y][x] = Vector4ui{345, 0, 123, 678};

Note that to access a pixel, you pick the row first, then the column in the row, which is why x and y are in a different order than I used to expect.

For some pixel types, you might need to add row padding etc. I think there was a function to compute the required data size for an image dimension and storage parameters 🤔

[zaichenhu]

You can allocate the data and then use .pixels<T>() to type cast the char data to some pixel type, e.g.:

    constexpr Vector2i size{2, 2};
    Image2D image{{}, PixelFormat::RGBA32UI, size,
        Containers::Array<char>{NoInit, size.product()*sizeof(UnsignedInt)*4}};
    auto pixels = image.pixels<Vector4ui>();
    
    const int x = 0;
    const int y = 1:
    pixels[y][x] = Vector4ui{345, 0, 123, 678};

Note that to access a pixel, you pick the row first, then the column in the row, which is why x and y are in a different order than I used to expect.

For some pixel types, you might need to add row padding etc. I think there was a function to compute the required data size for an image dimension and storage parameters 🤔

Thank you very much!