dlangui motion picture

picture.d

module motionpicture;
import std.stdio, std.algorithm : min;
import dlangui, dlangui.widgets.metadata;

class MotionPicture : ImageWidget {
    ColorDrawBuf cdbuf;
    int W = 16*30, H = 9*30; //current size

    this() {
        setSize(W, H, true);
    }

    override void measure(int parentWidth, int parentHeight) { 
        DrawableRef img = drawable;
        int w = 0;
        int h = 0;
        if (!img.isNull) {
            w = showW; 
            h = showH; 
            if (fitImage) {
                auto mgs = margins;
                auto sz = imgSizeScaled(parentWidth, parentHeight - mgs.top - mgs.bottom);
                w = sz.x; h = sz.y + mgs.top + mgs.bottom;
            }
        }
        measuredContent(parentWidth, parentHeight, w, h);
    }

    override void onDraw(DrawBuf buf) {
        if (visibility != Visibility.Visible)
            return;
        super.onDraw(buf);
        Rect rc = _pos;
        applyMargins(rc);
        auto saver = ClipRectSaver(buf, rc, alpha);
        applyPadding(rc);
        DrawableRef img = drawable;
        if (!img.isNull) {
            auto sz = Point(showW, showH);
            if (fitImage) 
                sz = imgSizeScaled(rc.width, rc.height);            
            applyAlign(rc, sz, Align.HCenter, valign);
            uint st = state;
            img.drawTo(buf, rc, st);
        }
    }

    void setSize(int w, int h, bool draw = false) {
        if (cdbuf is null) {
            stderr.writeln("new cdbuf");
            cdbuf = new ColorDrawBuf(w, h);
        }
        else {
            assumeSafeAppend(cdbuf._buf);
            stderr.writefln("_buf capacity=%d  length=%d start=%X", cdbuf._buf.capacity, cdbuf._buf.length, cdbuf._buf.ptr);
            cdbuf.resize(w, h);
        }
        W = w; H = h;
        if (draw) fillBytes(0);
        Ref!DrawBuf r = cdbuf;
        this.drawable = new ImageDrawable(r);
        this.margins = 0;// Rect(0, 10, 0, 10);//10
    }

}//class MotionPicture