Source file geometry.ml
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type size =
| Scale of float
| Pixel of int
| Guess
type aspect_opts =
| Keep_at_most
| Keep_at_least
| Dont_keep
type resize_switch =
| Always
| Bigger_only
| Smaller_only
type from =
| TopLeft
| BottomRight
| Center
type position =
| AtPixel of from * int
| AtScale of from * float
type t = {
geom_width : int;
geom_height : int;
geom_x : int;
geom_y : int;
}
type spec = {
spec_width : size;
spec_height : size;
spec_aspect : aspect_opts;
spec_switch : resize_switch;
spec_x : int;
spec_y : int;
}
let compute spec orgw orgh =
let w, h =
match spec.spec_width, spec.spec_height, spec.spec_aspect with
| Scale s, Guess, asp when asp <> Dont_keep ->
truncate (float orgw *. s), truncate (float orgh *. s)
| Guess, Scale s, asp when asp <> Dont_keep ->
truncate (float orgw *. s), truncate (float orgh *. s)
| Scale sw, Scale sh, _ ->
truncate (float orgw *. sw), truncate (float orgh *. sh)
| Pixel w, Guess, asp when asp <> Dont_keep ->
let s = float w /. float orgw in w, truncate (float orgh *. s)
| Guess, Pixel h, asp when asp <> Dont_keep ->
let s = float h /. float orgh in truncate (float orgw *. s), h
| Pixel w, Pixel h, _ -> w, h
| _ -> raise (Invalid_argument "Geometry.compute") in
let scalew = float w /. float orgw
and scaleh = float h /. float orgh in
let scalew', scaleh' =
match spec.spec_aspect with
| Keep_at_most ->
if scalew < scaleh then scalew, scalew else scaleh, scaleh
| Keep_at_least ->
if scalew < scaleh then scaleh, scaleh else scalew, scalew
| Dont_keep -> scalew, scaleh in
let scalew'', scaleh'' =
match spec.spec_switch with
| Always -> scalew', scaleh'
| Bigger_only when scalew' >= 1.0 && scaleh' >= 1.0 -> scalew', scaleh'
| Smaller_only when scalew' <= 1.0 && scaleh' <= 1.0 -> scalew', scaleh'
| _ -> 1.0, 1.0 in
let w' = if scalew = scalew'' then w else truncate (float orgw *. scalew'')
and h' = if scaleh = scaleh'' then h else truncate (float orgh *. scaleh'') in
{ geom_width = w';
geom_height = h';
geom_x = spec.spec_x;
geom_y = spec.spec_y; }
