naiveproxy/components/font_service/public/interfaces/font_service.mojom

// Copyright 2014 The Chromium Authors. All rights reserved.
// Use of this source code is governed by a BSD-style license that can be
// found in the LICENSE file.

module font_service.mojom;

import "mojo/common/file.mojom";

enum TypefaceSlant {
  ROMAN = 0,
  ITALIC = 1,
  OBLIQUE = 2,
};

struct TypefaceStyle {
  uint16 weight;
  uint8 width;
  TypefaceSlant slant;
};

// A reference to specific font on the font service.
struct FontIdentity {
  uint32 id;
  int32 ttc_index;
  // TODO(erg): So the string is supposed to be a path. However, the current
  // chrome code goes out of its way to send this to the renderer process, and
  // it is passed to blink, even though the openStream() IPC in chrome uses the
  // id number instead. Do more investigation about what we need to do to plug
  // this system path leak.
  string str_representation;
};

// Loads and resolves fonts.
//
// We still need to load fonts from within a sandboxed process. We set
// up a service to match fonts and load them,
interface FontService {
  // Returns the best match for |family_name| and |style|. On error, returns a
  // null |identity|.
  MatchFamilyName(string family_name, TypefaceStyle style) =>
      (FontIdentity? identity, string family_name, TypefaceStyle style);

  // Returns a handle to the raw font specified by |id_number|.
  OpenStream(uint32 id_number) => (mojo.common.mojom.File? font_handle);
};