ds blend select

function drawPixel(x:uint,y:uint):uint {
    //layers are assumed to already be sorted correctly based on priorities
    const layers:Array=[OBJ_ALPHA,OBJ0,BG0,OBJ1,BG1,OBJ2,BG2,OBJ3,BG3];
    var hasFirstColor:Boolean=false;

    var allowBlend:Boolean=false;
    var isObjAlpha:Boolean=false;

    var outWindowEnabled:Boolean=window0.enabled || window1.enabled || oamWindow.enabled;

    if(window0.enabled && window0.pixelIn(x,y)) {
        allowBlend=window0.blend;
    } else if(window1.enabled && window1.pixelIn(x,y)) {
        allowBlend=window1.blend;
    } else if(oamWindow.enabled && oamWindow.pixelIn(x,y)) {
        allowBlend=oamWindow.blend;
    } else if(outWindowEnabled) {
        allowBlend=outWindowBlend;
    } else {
        allowBlend=true;
    }

    var firstColor:uint;
    var secondColor:uint;

    for each(var layer:Layer in layers) {
        if(!layer.enabled) continue;
        var layerColor:uint=layer.sample(x,y);
        if(isTransparent(layerColor)) continue;

        if(layer==OBJ_ALPHA) {
            isObjAlpha=true;
            allowBlend=true;
        }

        if(allowBlend && !isObjAlpha) {
            if(!hasFirstColor) {
                if(!layer.blendFromEnabled) continue;
            } else {
                if(!layer.blendToEnabled) continue;
            }
        }

        if(!hasFirstColor) {
            firstLayer=layerColor;
            hasFirstColor=true;
            if(!allowBlend) break;
        } else {
            secondColor=layerColor;
            break;
        }

    }

    if(!hasFirstColor) {
        firstColor=BG0.basicPalette[0];
    }

    var blendOpThisPixel:BlendOp=masterBlendOp;
    if(!isTransparent(secondColor) && isObjAlpha) {
        blendOpThisPixel=AlphaBlend;
    }
    return blendOpThisPixel(firstColor,secondColor);
}