# Konformigi()
#  Resize the video for the largest resolution that still fits an defined box, retaining video's DAR (Display Aspect Ratio).
#  Useful for re-encodes to cellphones, upscales for your screen, etc. Basically, makes what every decent video player do when you ask it to go "full screen".
#


Function Konformigi(clip c, int "width", int "height", string "ResizeMethod",
\ int "modW", int "modH", string "roundmode")
{

# Set Defaults

    width = Default(width, c.width()) # box width
    height = Default(height, c.height()) # box height
    ResizeMethod = Default(ResizeMethod, "Spline36Resize") #chose your favorite resizer
    modW = Default(modW, 4) #defaults for YV12
    modH = Default(modH, 2) #defaults for YV12
    roundmode = Default(roundmode, "nearest") #can be "up" or "down" too

# Hack for assert work. I don't know why i can't put this inside the assert function

widthtAssert = (width/modW)*modW
heightAssert = (height/modH)*modH

# Quick sanity check, to guarantee the desired resolution, and the desired roundmode

Assert( width == widthtAssert , "Your box width needs to obey the modW you have set")
Assert( height == heightassert , "Your box height needs to obey the modH you have set")
Assert( roundmode == "down" || roundmode == "up" || roundmode == "nearest" , """Your roundmode needs to be "down" or "up" or "nearest". """)

# Calculate the scale factor

scaleWidth  = Float(Width)/Float(c.width())
scaleHeight = Float(Height)/Float(c.Height())
scaleFactor = Min(scaleWidth,scaleHeight)

# Apply the scale factor and convert to integer using the desired rounding

newWidth = roundmode == "nearest" ? (Round((c.Width() * scaleFactor)/modW))*modW :
 \          roundmode == "up" ? Ceil((c.Width() * scaleFactor)/modW)*modW :
 \          (Int(c.Width() * scaleFactor)/modW)*modW    # roundmode == "down"
newHeight = roundmode == "nearest" ? (Round((c.Height() * scaleFactor)/modH))*modH :
 \          roundmode == "up" ? Ceil((c.Height() * scaleFactor)/modH)*modH :
 \          (Int(c.Height() * scaleFactor)/modH)*modH    # roundmode == "down"


# I think the following is needed to guarantee that the box limits are keeped when rounding up. I'm not 100% sure, but it won't hurt.

newWidth = (newWidth > Width) ? width : newWidth
newHeight = (newHeight > Height) ? Height : newHeight

# Apply the desired resizer

Eval(ResizeMethod + "(c, " + String(newWidth) + ", " + String(newHeight) + ")")

return last
}