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# openfl
  • g
    Try on PowerShell next time that happens
  • b
    whats the best way to set the pixels of an openfl sprite? Like i have a RGBA array and, ideally, would like to just say "use this buffer" - is that possible? I cant see anything obvious in the Graphics class
  • b
    there is a 
    @:noCompletion private var __bitmap:BitmapData;
    there, which has a setPixels method... but is that safe to use?
  • p
    I'd load the array into a BitmapData and then use 
    graphics.beginBitmapFill
    .
  • b
    ive actually gone another route, ive basically created a Bitmap with BitmapData and then use setPixels on that... seems fast enough
  • b
    although, and im not sure if im going completely mad here: im trying to convert RGBA -> ARGB (since setPixels expects ARGB):
  • b
    Copy code
    haxe
        var newPixels = Bytes.alloc(pixels.length);
        for (y in 0..._bitmapData.height) {
            for (x in 0..._bitmapData.width) {
                var i = y * (_bitmapData.width * 4) + x * 4;
                var r = pixels.get(i + 0);
                var g = pixels.get(i + 1);
                var b = pixels.get(i + 2);
                var a = pixels.get(i + 3);
                
                newPixels.set(i + 0, a);
                newPixels.set(i + 1, r);
                newPixels.set(i + 2, g);
                newPixels.set(i + 3, b);
            }
        }
  • b
    and the result is wrong
  • b
    this seems to work:
  • b
    Copy code
    haxe
        // convert RGBA -> ARGB (well, actually BGRA for some reason)
        var bytesData = pixels.getData();
        var length:Int = pixels.length;
        var i:Int = 0;
        while (i < length) {
            var r = Bytes.fastGet(bytesData, i + 0);
            var g = Bytes.fastGet(bytesData, i + 1);
            var b = Bytes.fastGet(bytesData, i + 2);
            var a = Bytes.fastGet(bytesData, i + 3);
            newPixels.set(i + 0, b);
            newPixels.set(i + 1, g);
            newPixels.set(i + 2, r);
            newPixels.set(i + 3, a);
            i += 4;
        }
  • b
    ¯\_(ツ)_/¯
  • a
    How do you get the current window's name
  • a
    im trying to make the window transparent but the hx file im using requires a window name
  • a
    i tried everything
  • h
    Do you mean the window ID or the title perhaps ?
  • a
    Id i guess
  • a
    im using this i tried for HOURS Studying it and still didnt succeed
  • a
    i also tried putting the title for winname and didnt work
  • a
    always gave me this
  • h
    I've been thinking something like this would be needed to set transparency in a lime window but I haven't gotten this far yet. I'll be interested if you get it going.
  • h
    RE the errors have no French butit looks like it's not ballot with a constant and there seems to be a semi colon missing ?
  • h
    Are you going directly to windows api rather than thru SDL ?
  • a
    i got this from a friend both of us dont know the solution
  • a
    i dont even know where he found it
  • h
    I think it's the windows api. So I think the winname is what windows would call it. I was thinking to try the sdl setWindowOpacity function if I can get access to the sdl window object which I think lime should have somewhere
  • a
    im so tired ive been looking for hours
  • h
  • h
    Looks like the name should be the title
  • m
    So a lime window you can get from 
    Lib.application.windows
    has a private variable called 
    __backend
    which will give you a 
    NativeWindow
    on native targets like desktop. The 
    NativeWindow
    has a public variable called 
    handle
    which is the sdl window but it is 
    Dynamic
    . You will probably need to write some externs to set that opacity. I haven't done anything like that before, but that is where it is as far as I can tell.
  • h
    Yes I think that's the route and I've not done anything like this before either but hey that's the fun of it !
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