Reform

This function accepts RGB, Planar and YUY2 formats for all bit depths supported by avisynth+. It is thread safe. MT_NICE_FILTER

Reform has two modes viz: rectangle to quadrilateral and quadrilateral to rectangle. Lanczos or cubic or linear or nearest point interpolation methods can be opted. Coordinates can be specified in floating point real or in normalized form.

While there are no limits for specifying parameters, it has to be ensured that the specified parameters do not twist or fold the Quadrlateral.The accuracy of transform deteriorates with higher deviation of quad from rectangle. In the table of parameters R stands for Rectangle and Q stands for Quadrilateral.The quadrilateral coordinates need to be specified in clockwise order starting from the corner the top left corner of rectangle transforms to.

Description of parameters. Q stands for Quadrilateral and R for rectangle.

Parameter	Parameter name	Variable type	Limits of values	Default value
clip to be skewed into quadrilateral or deskewed into rectangle		clip		none
clip to be used as background		clip		none
resize interpolation to use	resize	string	"lanczos" "cubic" "line" "point"	"cubic"
Q left top x coordinate	qx	float	none	0
Q left top y coordinate	qy	float	none	0
Q right top x coordinate	qx1	float	none	frame wwidth - 1
Q right top y coordinate	qy1	float	none	0
Q right bottom x coordinate	qx2	float	none	frame width-1
Q right bottom y coordinate	qy2	float	none	height - 1
Q left bottom x coordinate	qx3	float	none	0
Q left bottom y coordinate	qy3	float	none	frame height-1
R left x coordinate	lx	float	none	0
R right x coordinate	rx	float	none	frame width-1
R top y coordinate	ty	float	none	0
R bottom y coordinate	by	float	none	frame height-1
Whether quadrilateral to rectangle conversion	qr	boolean	true for q to r, false for r to q	true
Whether normalised coordinates are specified?	norm	boolean	true for normalized, false for real	false

Script examples:-
ColorBars(). converttorgb32()
bg = blankclip(last)
Reform(last,bg,qr = false,norm = false, qx = 80, qy = 270, qx1 = 320, qy1 = 50, qx2 = 650, qy2 = 320,qx3 = 100, qy3 = 400)
Reform(last,last,qr = true,norm = false, qx = 80, qy = 270, qx1 = 320, qy1 = 50, qx2 = 650, qy2 = 320,qx3 = 100, qy3 = 400)

  ColorBars(). converttoYV12()
bg = blankclip(last)
Subtitle("Flying Colorbars()",text_color=$d0c000,align=5,size=40)
 ScriptClip("""
c= last

	bg = blankclip(last)
	h = height(bg)-1
	w = width(bg)-1	
    t = 0.061 *(current_frame)
    t2 = 0.127 *( current_frame)
    a = 0.501 + 0.5 * sin(t/pi)
    t1x = (-0.2*cos(t2)) * w
    t1y = (0.5-0.5*cos(t2)) * h
    t2x = (1.0+0.2*cos(t2)) * w
    t2y = (0.5-0.5*cos(t2)) * h
    t3x = (1.0+0.2*cos(t2)) * w
    t3y = (0.5+0.5*cos(t2)) * h
    t4x = (-0.2*cos(t2)) * w
    t4y = (0.5+0.5*cos(t2)) * h
    c1x = (0.5+a*cos(t)) * w
    c1y = (0.5+a*sin(t)) * h
    c2x = (0.5-a*sin(t)) * w
    c2y = (0.5+a*cos(t)) * h
    c3x = (0.5-a*cos(t)) * w
    c3y = (0.5-a*sin(t)) * h
    c4x = (0.5+a*sin(t)) * w
    c4y = (0.5-a*cos(t)) * h
	# comment out call having qr = true or qr = false or have both running to see the effect
	Reform(c, bg,lx=t1x,rx=t2x,ty=t1y,by=t3y,qx=c1x,qy=c1y, qx1=c2x,qy1=c2y,  qx2=c3x,qy2=c3y,qx3=c4x,qy3=c4y, resize = "point", qr = false)

#Reform(c,bg,lx=t1x,rx=t2x,ty=t1y,by=t3y,qx=c1x,qy=c1y, 		      qx1=c2x,qy1=c2y,  qx2=c3x,qy2=c3y,qx3=c4x,qy3=c4y,          resize="point", qr = true)

 """)