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(***********************************************************************)
(* *)
(* Active-DVI *)
(* *)
(* Projet Cristal, INRIA Rocquencourt *)
(* *)
(* Copyright 2002 Institut National de Recherche en Informatique et *)
(* en Automatique. All rights reserved. This file is distributed *)
(* under the terms of the GNU Lesser General Public License. *)
(* *)
(* Jun Furuse, Didier Rmy and Pierre Weis. *)
(* Contributions by Roberto Di Cosmo, Didier Le Botlan, *)
(* Xavier Leroy, and Alan Schmitt. *)
(* *)
(* Based on Mldvi by Alexandre Miquel. *)
(***********************************************************************)
(* $Id: devfont.ml,v 1.6 2003/10/26 20:18:40 weis Exp $ *)
module type DEVICE = sig
type glyph
val make_glyph : Glyph.t -> glyph
end ;;
module type DEVFONT = sig
type glyph
val find_metrics : string -> float -> (int * int) Table.t
val find_glyphs : string -> float -> glyph Table.t
end ;;
module Make (Dev : DEVICE) = struct
type glyph = Dev.glyph
let base_dpi = 600
let find_metrics =
let htable = Hashtbl.create 257 in
fun fontname dpi ->
let sdpi = int_of_float (ldexp dpi 16) in
let dpi = ldexp (float sdpi) (-16) in
try Hashtbl.find htable (fontname, sdpi)
with Not_found ->
let font = Font.find fontname base_dpi
and ratio = dpi /. float base_dpi in
let build code =
let cdef = Font.find_char_def font code in
(Misc.round (ratio *. float cdef.Font.dx),
Misc.round (ratio *. float cdef.Font.dy)) in
let table = Table.make build in
Hashtbl.add htable (fontname, sdpi) table ;
table
let find_glyphs =
let htable = Hashtbl.create 257 in
fun fontname dpi ->
let sdpi = Misc.round (ldexp dpi 16) in
let dpi = ldexp (float sdpi) (-16) in
try Hashtbl.find htable (fontname, sdpi)
with Not_found ->
let font = Font.find fontname base_dpi
and ratio = dpi /. float base_dpi in
let build code =
let cdef = Font.find_char_def font code in
Dev.make_glyph (Glyph.from_char_def cdef ratio) in
let table = Table.make build in
Hashtbl.add htable (fontname, sdpi) table ;
table
end ;;
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