forked from mirrors/gecko-dev
570 lines
20 KiB
C++
570 lines
20 KiB
C++
/* -*- Mode: C++; tab-width: 2; indent-tabs-mode: nil; c-basic-offset: 2 -*- */
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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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* Netscape Communications Corporation.
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* Portions created by the Initial Developer are Copyright (C) 1998
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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 of the GNU General Public License Version 2 or later (the "GPL"),
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* or 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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#include <math.h>
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#include "nsStyleUtil.h"
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#include "nsCRT.h"
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#include "nsStyleConsts.h"
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#include "nsGkAtoms.h"
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#include "nsILinkHandler.h"
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#include "nsILink.h"
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#include "nsIContent.h"
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#include "nsIDocument.h"
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#include "nsINameSpaceManager.h"
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#include "nsIURI.h"
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#include "nsNetUtil.h"
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#include "nsReadableUtils.h"
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#include "nsContentUtils.h"
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#include "nsTextFormatter.h"
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// XXX This is here because nsCachedStyleData is accessed outside of
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// the content module; e.g., by nsCSSFrameConstructor.
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#include "nsRuleNode.h"
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nsCachedStyleData::StyleStructInfo
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nsCachedStyleData::gInfo[] = {
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#define STYLE_STRUCT_INHERITED(name, checkdata_cb, ctor_args) \
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{ offsetof(nsCachedStyleData, mInheritedData), \
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offsetof(nsInheritedStyleData, m##name##Data), \
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PR_FALSE },
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#define STYLE_STRUCT_RESET(name, checkdata_cb, ctor_args) \
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{ offsetof(nsCachedStyleData, mResetData), \
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offsetof(nsResetStyleData, m##name##Data), \
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PR_TRUE },
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#include "nsStyleStructList.h"
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#undef STYLE_STRUCT_INHERITED
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#undef STYLE_STRUCT_RESET
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{ 0, 0, 0 }
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};
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#define POSITIVE_SCALE_FACTOR 1.10 /* 10% */
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#define NEGATIVE_SCALE_FACTOR .90 /* 10% */
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//------------------------------------------------------------------------------
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//
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//------------------------------------------------------------------------------
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/*
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* Return the scaling percentage given a font scaler
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* Lifted from layutil.c
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*/
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float nsStyleUtil::GetScalingFactor(PRInt32 aScaler)
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{
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double scale = 1.0;
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double mult;
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PRInt32 count;
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if(aScaler < 0) {
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count = -aScaler;
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mult = NEGATIVE_SCALE_FACTOR;
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}
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else {
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count = aScaler;
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mult = POSITIVE_SCALE_FACTOR;
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}
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/* use the percentage scaling factor to the power of the pref */
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while(count--) {
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scale *= mult;
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}
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return (float)scale;
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}
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//------------------------------------------------------------------------------
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// Font Algorithm Code
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//------------------------------------------------------------------------------
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nscoord
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nsStyleUtil::CalcFontPointSize(PRInt32 aHTMLSize, PRInt32 aBasePointSize,
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float aScalingFactor, nsPresContext* aPresContext,
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nsFontSizeType aFontSizeType)
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{
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#define sFontSizeTableMin 9
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#define sFontSizeTableMax 16
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// This table seems to be the one used by MacIE5. We hope its adoption in Mozilla
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// and eventually in WinIE5.5 will help to establish a standard rendering across
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// platforms and browsers. For now, it is used only in Strict mode. More can be read
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// in the document written by Todd Farhner at:
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// http://style.verso.com/font_size_intervals/altintervals.html
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//
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static PRInt32 sStrictFontSizeTable[sFontSizeTableMax - sFontSizeTableMin + 1][8] =
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{
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{ 9, 9, 9, 9, 11, 14, 18, 27},
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{ 9, 9, 9, 10, 12, 15, 20, 30},
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{ 9, 9, 10, 11, 13, 17, 22, 33},
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{ 9, 9, 10, 12, 14, 18, 24, 36},
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{ 9, 10, 12, 13, 16, 20, 26, 39},
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{ 9, 10, 12, 14, 17, 21, 28, 42},
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{ 9, 10, 13, 15, 18, 23, 30, 45},
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{ 9, 10, 13, 16, 18, 24, 32, 48}
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};
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// HTML 1 2 3 4 5 6 7
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// CSS xxs xs s m l xl xxl
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// |
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// user pref
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//
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//------------------------------------------------------------
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//
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// This table gives us compatibility with WinNav4 for the default fonts only.
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// In WinNav4, the default fonts were:
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//
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// Times/12pt == Times/16px at 96ppi
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// Courier/10pt == Courier/13px at 96ppi
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//
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// The 2 lines below marked "anchored" have the exact pixel sizes used by
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// WinNav4 for Times/12pt and Courier/10pt at 96ppi. As you can see, the
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// HTML size 3 (user pref) for those 2 anchored lines is 13px and 16px.
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//
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// All values other than the anchored values were filled in by hand, never
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// going below 9px, and maintaining a "diagonal" relationship. See for
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// example the 13s -- they follow a diagonal line through the table.
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//
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static PRInt32 sQuirksFontSizeTable[sFontSizeTableMax - sFontSizeTableMin + 1][8] =
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{
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{ 9, 9, 9, 9, 11, 14, 18, 28 },
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{ 9, 9, 9, 10, 12, 15, 20, 31 },
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{ 9, 9, 9, 11, 13, 17, 22, 34 },
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{ 9, 9, 10, 12, 14, 18, 24, 37 },
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{ 9, 9, 10, 13, 16, 20, 26, 40 }, // anchored (13)
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{ 9, 9, 11, 14, 17, 21, 28, 42 },
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{ 9, 10, 12, 15, 17, 23, 30, 45 },
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{ 9, 10, 13, 16, 18, 24, 32, 48 } // anchored (16)
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};
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// HTML 1 2 3 4 5 6 7
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// CSS xxs xs s m l xl xxl
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// |
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// user pref
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#if 0
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//
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// These are the exact pixel values used by WinIE5 at 96ppi.
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//
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{ ?, 8, 11, 12, 13, 16, 21, 32 }, // smallest
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{ ?, 9, 12, 13, 16, 21, 27, 40 }, // smaller
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{ ?, 10, 13, 16, 18, 24, 32, 48 }, // medium
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{ ?, 13, 16, 19, 21, 27, 37, ?? }, // larger
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{ ?, 16, 19, 21, 24, 32, 43, ?? } // largest
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//
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// HTML 1 2 3 4 5 6 7
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// CSS ? ? ? ? ? ? ? ?
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//
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// (CSS not tested yet.)
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//
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#endif
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static PRInt32 sFontSizeFactors[8] = { 60,75,89,100,120,150,200,300 };
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static PRInt32 sCSSColumns[7] = {0, 1, 2, 3, 4, 5, 6}; // xxs...xxl
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static PRInt32 sHTMLColumns[7] = {1, 2, 3, 4, 5, 6, 7}; // 1...7
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double dFontSize;
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if (aFontSizeType == eFontSize_HTML) {
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aHTMLSize--; // input as 1-7
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}
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if (aHTMLSize < 0)
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aHTMLSize = 0;
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else if (aHTMLSize > 6)
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aHTMLSize = 6;
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PRInt32* column;
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switch (aFontSizeType)
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{
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case eFontSize_HTML: column = sHTMLColumns; break;
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case eFontSize_CSS: column = sCSSColumns; break;
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}
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// Make special call specifically for fonts (needed PrintPreview)
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PRInt32 fontSize = nsPresContext::AppUnitsToIntCSSPixels(aBasePointSize);
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if ((fontSize >= sFontSizeTableMin) && (fontSize <= sFontSizeTableMax))
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{
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PRInt32 row = fontSize - sFontSizeTableMin;
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if (aPresContext->CompatibilityMode() == eCompatibility_NavQuirks) {
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dFontSize = nsPresContext::CSSPixelsToAppUnits(sQuirksFontSizeTable[row][column[aHTMLSize]]);
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} else {
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dFontSize = nsPresContext::CSSPixelsToAppUnits(sStrictFontSizeTable[row][column[aHTMLSize]]);
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}
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}
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else
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{
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PRInt32 factor = sFontSizeFactors[column[aHTMLSize]];
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dFontSize = (factor * aBasePointSize) / 100;
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}
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dFontSize *= aScalingFactor;
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if (1.0 < dFontSize) {
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return (nscoord)dFontSize;
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}
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return (nscoord)1;
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}
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//------------------------------------------------------------------------------
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//
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//------------------------------------------------------------------------------
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nscoord nsStyleUtil::FindNextSmallerFontSize(nscoord aFontSize, PRInt32 aBasePointSize,
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float aScalingFactor, nsPresContext* aPresContext,
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nsFontSizeType aFontSizeType)
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{
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PRInt32 index;
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PRInt32 indexMin;
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PRInt32 indexMax;
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float relativePosition;
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nscoord smallerSize;
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nscoord indexFontSize = aFontSize; // XXX initialize to quell a spurious gcc3.2 warning
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nscoord smallestIndexFontSize;
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nscoord largestIndexFontSize;
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nscoord smallerIndexFontSize;
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nscoord largerIndexFontSize;
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nscoord onePx = nsPresContext::CSSPixelsToAppUnits(1);
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if (aFontSizeType == eFontSize_HTML) {
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indexMin = 1;
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indexMax = 7;
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} else {
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indexMin = 0;
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indexMax = 6;
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}
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smallestIndexFontSize = CalcFontPointSize(indexMin, aBasePointSize, aScalingFactor, aPresContext, aFontSizeType);
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largestIndexFontSize = CalcFontPointSize(indexMax, aBasePointSize, aScalingFactor, aPresContext, aFontSizeType);
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if (aFontSize > smallestIndexFontSize) {
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if (aFontSize < NSToCoordRound(float(largestIndexFontSize) * 1.5)) { // smaller will be in HTML table
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// find largest index smaller than current
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for (index = indexMax; index >= indexMin; index--) {
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indexFontSize = CalcFontPointSize(index, aBasePointSize, aScalingFactor, aPresContext, aFontSizeType);
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if (indexFontSize < aFontSize)
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break;
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}
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// set up points beyond table for interpolation purposes
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if (indexFontSize == smallestIndexFontSize) {
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smallerIndexFontSize = indexFontSize - onePx;
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largerIndexFontSize = CalcFontPointSize(index+1, aBasePointSize, aScalingFactor, aPresContext, aFontSizeType);
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} else if (indexFontSize == largestIndexFontSize) {
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smallerIndexFontSize = CalcFontPointSize(index-1, aBasePointSize, aScalingFactor, aPresContext, aFontSizeType);
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largerIndexFontSize = NSToCoordRound(float(largestIndexFontSize) * 1.5);
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} else {
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smallerIndexFontSize = CalcFontPointSize(index-1, aBasePointSize, aScalingFactor, aPresContext, aFontSizeType);
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largerIndexFontSize = CalcFontPointSize(index+1, aBasePointSize, aScalingFactor, aPresContext, aFontSizeType);
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}
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// compute the relative position of the parent size between the two closest indexed sizes
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relativePosition = float(aFontSize - indexFontSize) / float(largerIndexFontSize - indexFontSize);
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// set the new size to have the same relative position between the next smallest two indexed sizes
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smallerSize = smallerIndexFontSize + NSToCoordRound(relativePosition * (indexFontSize - smallerIndexFontSize));
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}
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else { // larger than HTML table, drop by 33%
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smallerSize = NSToCoordRound(float(aFontSize) / 1.5);
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}
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}
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else { // smaller than HTML table, drop by 1px
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smallerSize = PR_MAX(aFontSize - onePx, onePx);
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}
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return smallerSize;
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}
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//------------------------------------------------------------------------------
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//
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//------------------------------------------------------------------------------
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nscoord nsStyleUtil::FindNextLargerFontSize(nscoord aFontSize, PRInt32 aBasePointSize,
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float aScalingFactor, nsPresContext* aPresContext,
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nsFontSizeType aFontSizeType)
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{
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PRInt32 index;
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PRInt32 indexMin;
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PRInt32 indexMax;
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float relativePosition;
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nscoord largerSize;
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nscoord indexFontSize = aFontSize; // XXX initialize to quell a spurious gcc3.2 warning
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nscoord smallestIndexFontSize;
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nscoord largestIndexFontSize;
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nscoord smallerIndexFontSize;
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nscoord largerIndexFontSize;
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nscoord onePx = nsPresContext::CSSPixelsToAppUnits(1);
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if (aFontSizeType == eFontSize_HTML) {
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indexMin = 1;
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indexMax = 7;
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} else {
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indexMin = 0;
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indexMax = 6;
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}
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smallestIndexFontSize = CalcFontPointSize(indexMin, aBasePointSize, aScalingFactor, aPresContext, aFontSizeType);
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largestIndexFontSize = CalcFontPointSize(indexMax, aBasePointSize, aScalingFactor, aPresContext, aFontSizeType);
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if (aFontSize > (smallestIndexFontSize - onePx)) {
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if (aFontSize < largestIndexFontSize) { // larger will be in HTML table
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// find smallest index larger than current
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for (index = indexMin; index <= indexMax; index++) {
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indexFontSize = CalcFontPointSize(index, aBasePointSize, aScalingFactor, aPresContext, aFontSizeType);
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if (indexFontSize > aFontSize)
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break;
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}
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// set up points beyond table for interpolation purposes
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if (indexFontSize == smallestIndexFontSize) {
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smallerIndexFontSize = indexFontSize - onePx;
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largerIndexFontSize = CalcFontPointSize(index+1, aBasePointSize, aScalingFactor, aPresContext, aFontSizeType);
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} else if (indexFontSize == largestIndexFontSize) {
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smallerIndexFontSize = CalcFontPointSize(index-1, aBasePointSize, aScalingFactor, aPresContext, aFontSizeType);
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largerIndexFontSize = NSToCoordRound(float(largestIndexFontSize) * 1.5);
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} else {
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smallerIndexFontSize = CalcFontPointSize(index-1, aBasePointSize, aScalingFactor, aPresContext, aFontSizeType);
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largerIndexFontSize = CalcFontPointSize(index+1, aBasePointSize, aScalingFactor, aPresContext, aFontSizeType);
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}
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// compute the relative position of the parent size between the two closest indexed sizes
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relativePosition = float(aFontSize - smallerIndexFontSize) / float(indexFontSize - smallerIndexFontSize);
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// set the new size to have the same relative position between the next largest two indexed sizes
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largerSize = indexFontSize + NSToCoordRound(relativePosition * (largerIndexFontSize - indexFontSize));
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}
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else { // larger than HTML table, increase by 50%
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largerSize = NSToCoordRound(float(aFontSize) * 1.5);
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}
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}
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else { // smaller than HTML table, increase by 1px
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largerSize = aFontSize + onePx;
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}
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return largerSize;
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}
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//------------------------------------------------------------------------------
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//
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//------------------------------------------------------------------------------
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PRInt32
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nsStyleUtil::ConstrainFontWeight(PRInt32 aWeight)
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{
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aWeight = ((aWeight < 100) ? 100 : ((aWeight > 900) ? 900 : aWeight));
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PRInt32 base = ((aWeight / 100) * 100);
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PRInt32 step = (aWeight % 100);
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PRBool negativeStep = PRBool(50 < step);
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PRInt32 maxStep;
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if (negativeStep) {
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step = 100 - step;
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maxStep = (base / 100);
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base += 100;
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}
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else {
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maxStep = ((900 - base) / 100);
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}
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if (maxStep < step) {
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step = maxStep;
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}
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return (base + ((negativeStep) ? -step : step));
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}
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/*static*/
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PRBool nsStyleUtil::IsHTMLLink(nsIContent *aContent, nsIAtom *aTag, nsPresContext *aPresContext, nsLinkState *aState)
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{
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NS_ASSERTION(aContent && aState, "null arg in IsHTMLLink");
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// check for:
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// - HTML ANCHOR with valid HREF
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// - HTML LINK with valid HREF
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// - HTML AREA with valid HREF
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PRBool result = PR_FALSE;
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if ((aTag == nsGkAtoms::a) ||
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(aTag == nsGkAtoms::link) ||
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(aTag == nsGkAtoms::area)) {
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nsCOMPtr<nsILink> link( do_QueryInterface(aContent) );
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// In XML documents, this can be null.
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if (link) {
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nsLinkState linkState;
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link->GetLinkState(linkState);
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if (linkState == eLinkState_Unknown) {
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// if it is an anchor, area or link then check the href attribute
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// make sure this anchor has a link even if we are not testing state
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// if there is no link, then this anchor is not really a linkpseudo.
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// bug=23209
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nsCOMPtr<nsIURI> hrefURI;
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link->GetHrefURI(getter_AddRefs(hrefURI));
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if (hrefURI) {
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nsILinkHandler *linkHandler = aPresContext->GetLinkHandler();
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if (linkHandler) {
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linkHandler->GetLinkState(hrefURI, linkState);
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}
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else {
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// no link handler? then all links are unvisited
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linkState = eLinkState_Unvisited;
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}
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} else {
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linkState = eLinkState_NotLink;
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}
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if (linkState != eLinkState_NotLink) {
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aPresContext->Document()->AddStyleRelevantLink(aContent, hrefURI);
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}
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link->SetLinkState(linkState);
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}
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if (linkState != eLinkState_NotLink) {
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*aState = linkState;
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result = PR_TRUE;
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}
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}
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}
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return result;
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}
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/*static*/
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PRBool nsStyleUtil::IsLink(nsIContent *aContent,
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nsPresContext *aPresContext,
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nsLinkState *aState)
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{
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// XXX PERF This function will cause serious performance problems on
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// pages with lots of XLinks. We should be caching the visited
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// state of the XLinks. Where???
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NS_ASSERTION(aContent && aState, "invalid call to IsLink with null content");
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|
|
|
PRBool rv = PR_FALSE;
|
|
|
|
if (aContent && aState) {
|
|
nsCOMPtr<nsIURI> absURI;
|
|
if (aContent->IsLink(getter_AddRefs(absURI))) {
|
|
nsILinkHandler *linkHandler = aPresContext->GetLinkHandler();
|
|
if (linkHandler) {
|
|
linkHandler->GetLinkState(absURI, *aState);
|
|
}
|
|
else {
|
|
// no link handler? then all links are unvisited
|
|
*aState = eLinkState_Unvisited;
|
|
}
|
|
aPresContext->Document()->AddStyleRelevantLink(aContent, absURI);
|
|
|
|
rv = PR_TRUE;
|
|
}
|
|
}
|
|
return rv;
|
|
}
|
|
|
|
// Compare two language strings
|
|
PRBool nsStyleUtil::DashMatchCompare(const nsAString& aAttributeValue,
|
|
const nsAString& aSelectorValue,
|
|
const nsStringComparator& aComparator)
|
|
{
|
|
PRBool result;
|
|
PRUint32 selectorLen = aSelectorValue.Length();
|
|
PRUint32 attributeLen = aAttributeValue.Length();
|
|
if (selectorLen > attributeLen) {
|
|
result = PR_FALSE;
|
|
}
|
|
else {
|
|
nsAString::const_iterator iter;
|
|
if (selectorLen != attributeLen &&
|
|
*aAttributeValue.BeginReading(iter).advance(selectorLen) !=
|
|
PRUnichar('-')) {
|
|
// to match, the aAttributeValue must have a dash after the end of
|
|
// the aSelectorValue's text (unless the aSelectorValue and the
|
|
// aAttributeValue have the same text)
|
|
result = PR_FALSE;
|
|
}
|
|
else {
|
|
result = StringBeginsWith(aAttributeValue, aSelectorValue, aComparator);
|
|
}
|
|
}
|
|
return result;
|
|
}
|
|
|
|
void nsStyleUtil::EscapeCSSString(const nsString& aString, nsAString& aReturn)
|
|
{
|
|
aReturn.Truncate();
|
|
|
|
const nsString::char_type* in = aString.get();
|
|
const nsString::char_type* const end = in + aString.Length();
|
|
for (; in != end; in++)
|
|
{
|
|
if (*in < 0x20)
|
|
{
|
|
// Escape all characters below 0x20 numerically.
|
|
|
|
/*
|
|
This is the buffer into which snprintf should write. As the hex. value is,
|
|
for numbers below 0x20, max. 2 characters long, we don't need more than 5
|
|
characters ("\XX "+NUL).
|
|
*/
|
|
PRUnichar buf[5];
|
|
nsTextFormatter::snprintf(buf, NS_ARRAY_LENGTH(buf), NS_LITERAL_STRING("\\%hX ").get(), *in);
|
|
aReturn.Append(buf);
|
|
|
|
} else switch (*in) {
|
|
// Special characters which should be escaped: Quotes and backslash
|
|
case '\\':
|
|
case '\"':
|
|
case '\'':
|
|
aReturn.Append(PRUnichar('\\'));
|
|
// And now, after the eventual escaping character, the actual one.
|
|
default:
|
|
aReturn.Append(PRUnichar(*in));
|
|
}
|
|
}
|
|
}
|
|
|
|
/* static */ float
|
|
nsStyleUtil::ColorComponentToFloat(PRUint8 aAlpha)
|
|
{
|
|
// Alpha values are expressed as decimals, so we should convert
|
|
// back, using as few decimal places as possible for
|
|
// round-tripping.
|
|
// First try two decimal places:
|
|
float rounded = NS_roundf(float(aAlpha) * 100.0f / 255.0f) / 100.0f;
|
|
if (FloatToColorComponent(rounded) != aAlpha) {
|
|
// Use three decimal places.
|
|
rounded = NS_roundf(float(aAlpha) * 1000.0f / 255.0f) / 1000.0f;
|
|
}
|
|
return rounded;
|
|
}
|