#include "paint.h"

void
drawshadow(Image *dst, Rectangle r)
{
	static Image *shadow;

	if(shadow == nil) {
		if((shadow = allocimage(display, Rect(0, 0, 1, 1), RGBA32, 1, 0x0000007F)) == nil)
			sysfatal("allocimage shadow: %r");
	}

	draw(dst, Rect(r.min.x+4, r.max.y+1, r.max.x+4, r.max.y+4), shadow, nil, ZP);
	draw(dst, Rect(r.max.x+1, r.min.y+4, r.max.x+4, r.max.y+1), shadow, nil, ZP);
}

static void
redrawshadow(Widget *w, RedrawMode mode)
{
	if(mode == RDall) {
		border(w->screen, w->r, -1, display->black, ZP);
		drawshadow(w->screen, w->r);
	}
	widgetredrawdescend(w, mode);
}

static Rdims
shadowdims(Widget *w)
{
	return w->children->dims(w->children);
}

static void
resizeshadow(Widget *w, Point dim)
{
	w->children->resize(w->children, dim);
	w->r = rectaddpt(Rpt(ZP, dim), w->r.min);
}

Widget *
mkshadow(Widget *c)
{
	Widget *w;

	if((w = mkwidget(ZR, widgetmousedescend, widgetsyncnop,
		redrawshadow, shadowdims, resizeshadow, freewidget, nil)) == nil )
		sysfatal("mkshadow: %r");
	addchildwidget(w, c, ZP);
	return w;
}

static void
redrawbg(Widget *w, RedrawMode mode)
{
	if(mode == RDall)
		draw(w->screen, w->r, w->aux, nil, ZP);
	widgetredrawdescend(w, mode);
}

static Rdims
bgdims(Widget *w)
{
	Image *bg;

	bg = w->aux;
	return (Rdims){ZP, rectdim(bg->r), INFDIM};
}

static void
resizebg(Widget *w, Point dim)
{
	w->r = rectaddpt(Rpt(ZP, dim), w->r.min);
	widgetresizedescend(w, dim);
}

Widget *
mkbg(Image *bg)
{
	Widget *w;

	if((w = mkwidget(ZR, widgetmousedescend, widgetsyncnop,
		redrawbg, bgdims, resizebg, freewidget, bg)) == nil )
		sysfatal("mkbg: %r");
	return w;
}