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119 lines
4.8 KiB
C
119 lines
4.8 KiB
C
/* -*- Mode: C++; tab-width: 20; indent-tabs-mode: nil; c-basic-offset: 4 -*- */
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/* ***** BEGIN LICENSE BLOCK *****
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* Version: MPL 1.1/GPL 2.0/LGPL 2.1
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*
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* The contents of this file are subject to the Mozilla Public License Version
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* 1.1 (the "License"); you may not use this file except in compliance with
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* the License. You may obtain a copy of the License at
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* http://www.mozilla.org/MPL/
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*
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* Software distributed under the License is distributed on an "AS IS" basis,
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* WITHOUT WARRANTY OF ANY KIND, either express or implied. See the License
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* for the specific language governing rights and limitations under the
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* License.
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*
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* The Original Code is mozilla.org code.
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*
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* The Initial Developer of the Original Code is
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* Christopher Blizzard <blizzard@mozilla.org>.
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* Portions created by the Initial Developer are Copyright (C) 2002
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* the Initial Developer. All Rights Reserved.
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*
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* Contributor(s):
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*
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* Alternatively, the contents of this file may be used under the terms of
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* either the GNU General Public License Version 2 or later (the "GPL"), or
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* the GNU Lesser General Public License Version 2.1 or later (the "LGPL"),
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* in which case the provisions of the GPL or the LGPL are applicable instead
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* of those above. If you wish to allow use of your version of this file only
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* under the terms of either the GPL or the LGPL, and not to allow others to
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* use your version of this file under the terms of the MPL, indicate your
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* decision by deleting the provisions above and replace them with the notice
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* and other provisions required by the GPL or the LGPL. If you do not delete
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* the provisions above, a recipient may use your version of this file under
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* the terms of any one of the MPL, the GPL or the LGPL.
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*
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* ***** END LICENSE BLOCK ***** */
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#ifndef __nsBoundingMetrics_h
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#define __nsBoundingMetrics_h
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#include "nsCoord.h"
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/* Struct used for accurate measurements of a string, in order to
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* allow precise positioning when processing MathML. This is in its
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* own header file because some very-widely-included headers need it
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* but not the rest of nsFontMetrics, or vice versa.
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*/
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struct nsBoundingMetrics {
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///////////
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// Metrics that _exactly_ enclose the text:
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// The character coordinate system is the one used on X Windows:
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// 1. The origin is located at the intersection of the baseline
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// with the left of the character's cell.
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// 2. All horizontal bearings are oriented from left to right.
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// 2. All horizontal bearings are oriented from left to right.
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// 3. The ascent is oriented from bottom to top (being 0 at the orgin).
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// 4. The descent is oriented from top to bottom (being 0 at the origin).
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// Note that Win32/Mac/PostScript use a different convention for
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// the descent (all vertical measurements are oriented from bottom
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// to top on these palatforms). Make sure to flip the sign of the
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// descent on these platforms for cross-platform compatibility.
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// Any of the following member variables listed here can have
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// positive or negative value.
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nscoord leftBearing;
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/* The horizontal distance from the origin of the drawing
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operation to the left-most part of the drawn string. */
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nscoord rightBearing;
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/* The horizontal distance from the origin of the drawing
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operation to the right-most part of the drawn string.
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The _exact_ width of the string is therefore:
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rightBearing - leftBearing */
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nscoord ascent;
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/* The vertical distance from the origin of the drawing
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operation to the top-most part of the drawn string. */
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nscoord descent;
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/* The vertical distance from the origin of the drawing
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operation to the bottom-most part of the drawn string.
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The _exact_ height of the string is therefore:
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ascent + descent */
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nscoord width;
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/* The horizontal distance from the origin of the drawing
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operation to the correct origin for drawing another string
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to follow the current one. Depending on the font, this
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could be greater than or less than the right bearing. */
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nsBoundingMetrics() : leftBearing(0), rightBearing(0),
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ascent(0), descent(0), width(0)
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{}
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void
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operator += (const nsBoundingMetrics& bm) {
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if (ascent + descent == 0 && rightBearing - leftBearing == 0) {
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ascent = bm.ascent;
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descent = bm.descent;
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leftBearing = width + bm.leftBearing;
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rightBearing = width + bm.rightBearing;
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}
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else {
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if (ascent < bm.ascent) ascent = bm.ascent;
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if (descent < bm.descent) descent = bm.descent;
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leftBearing = NS_MIN(leftBearing, width + bm.leftBearing);
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rightBearing = NS_MAX(rightBearing, width + bm.rightBearing);
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}
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width += bm.width;
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}
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};
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#endif // __nsBoundingMetrics_h
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