Source/core/html/TextMetrics.idl

/*
 * Copyright (C) 2008 Apple Inc. All Rights Reserved.
 *
 * Redistribution and use in source and binary forms, with or without
 * modification, are permitted provided that the following conditions
 * are met:
 * 1. Redistributions of source code must retain the above copyright
 *    notice, this list of conditions and the following disclaimer.
 * 2. Redistributions in binary form must reproduce the above copyright
 *    notice, this list of conditions and the following disclaimer in the
 *    documentation and/or other materials provided with the distribution.
 *
 * THIS SOFTWARE IS PROVIDED BY APPLE INC. ``AS IS'' AND ANY
 * EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE
 * IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR
 * PURPOSE ARE DISCLAIMED.  IN NO EVENT SHALL APPLE INC. OR
 * CONTRIBUTORS BE LIABLE FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL,
 * EXEMPLARY, OR CONSEQUENTIAL DAMAGES (INCLUDING, BUT NOT LIMITED TO,
 * PROCUREMENT OF SUBSTITUTE GOODS OR SERVICES; LOSS OF USE, DATA, OR
 * PROFITS; OR BUSINESS INTERRUPTION) HOWEVER CAUSED AND ON ANY THEORY
 * OF LIABILITY, WHETHER IN CONTRACT, STRICT LIABILITY, OR TORT
 * (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY OUT OF THE USE
 * OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF SUCH DAMAGE.
 */
[
    WillBeGarbageCollected,
] interface TextMetrics {
    // x-direction
    readonly attribute float width;
    [RuntimeEnabled=ExperimentalCanvasFeatures] readonly attribute float actualBoundingBoxLeft;
    [RuntimeEnabled=ExperimentalCanvasFeatures] readonly attribute float actualBoundingBoxRight;

    // y-direction
    [RuntimeEnabled=ExperimentalCanvasFeatures] readonly attribute float fontBoundingBoxAscent;
    [RuntimeEnabled=ExperimentalCanvasFeatures] readonly attribute float fontBoundingBoxDescent;
    [RuntimeEnabled=ExperimentalCanvasFeatures] readonly attribute float actualBoundingBoxAscent;
    [RuntimeEnabled=ExperimentalCanvasFeatures] readonly attribute float actualBoundingBoxDescent;
    [RuntimeEnabled=ExperimentalCanvasFeatures] readonly attribute float emHeightAscent;
    [RuntimeEnabled=ExperimentalCanvasFeatures] readonly attribute float emHeightDescent;
    [RuntimeEnabled=ExperimentalCanvasFeatures] readonly attribute float hangingBaseline;
    [RuntimeEnabled=ExperimentalCanvasFeatures] readonly attribute float alphabeticBaseline;
    [RuntimeEnabled=ExperimentalCanvasFeatures] readonly attribute float ideographicBaseline;
};