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scale rendering to fit window

	when displayed in a window, the image is scaled to fit the window dimensions.

--- a/svg.c

+++ b/svg.c

@@ -14,12 +14,14 @@

 Image *svg;

 void

-rasterize(void)

+rasterize(int scale)

 {

 	NSVGimage *image;

 	struct NSVGrasterizer *rast;

 	uchar *data;

 	int w, h;

+	float s;

+	Rectangle r;

 	image = nsvgParseFromFile(filename, "px", 96);

 	if(image==nil)

@@ -26,9 +28,19 @@

 		sysfatal("svg parse: %r");

 	w = image->width;

 	h = image->height;

+	s = 1.0f;

+	if(scale){

+		r = insetrect(screen->r, 10);

+		w = Dx(r);

+		h = Dy(r);

+		if(w < h)

+			s = (float)w/image->width;

+		else

+			s = (float)h/image->height;

+	}

 	rast = nsvgCreateRasterizer();

 	data = malloc(w*h*4);

-	nsvgRasterize(rast, image, 0, 0, 1, data, w, h, w*4);

+	nsvgRasterize(rast, image, 0, 0, s, data, w, h, w*4);

 	nsvgDelete(image);

 	nsvgDeleteRasterizer(rast);

 	svg = allocimage(display, Rect(0, 0, w, h), ABGR32, 0, DNofill);

@@ -42,6 +54,8 @@

 	if(new && getwindow(display, Refnone)<0)

 		sysfatal("cannot reattach: %r");

+	freeimage(svg);

+	rasterize(1);

 	p.x = (Dx(screen->r) - Dx(svg->r))/2;

 	p.y = (Dy(screen->r) - Dy(svg->r))/2;

 	draw(screen, screen->r, display->white, nil, ZP);

@@ -76,8 +90,8 @@

 	filename = *argv;

 	if(initdraw(nil, nil, "svg")<0)

 		sysfatal("initdraw: %r");

-	rasterize();

 	if(nineflag){

+		rasterize(0);

 		writeimage(1, svg, 0);

 		freeimage(svg);

 		exits(nil);