зеркало из https://github.com/mozilla/pjs.git
650 строки
21 KiB
C++
650 строки
21 KiB
C++
/* -*- Mode: C++; tab-width: 2; indent-tabs-mode: nil; c-basic-offset: 2 -*-
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*
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* The contents of this file are subject to the Netscape Public
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* License Version 1.1 (the "License"); you may not use this file
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* except in compliance with the License. You may obtain a copy of
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* the License at http://www.mozilla.org/NPL/
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*
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* Software distributed under the License is distributed on an "AS
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* IS" basis, WITHOUT WARRANTY OF ANY KIND, either express or
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* implied. See the License for the specific language governing
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* rights and limitations under the 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 Netscape
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* Communications Corporation. Portions created by Netscape are
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* Copyright (C) 1998 Netscape Communications Corporation. All
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* Rights Reserved.
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*
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* Contributor(s):
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* IBM Corp.
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*/
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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 "nsIStyleContext.h"
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#include "nsStyleConsts.h"
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#include "nsUnitConversion.h"
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#include "nsIServiceManager.h"
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#include "nsIPref.h"
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static NS_DEFINE_CID(kPrefCID, NS_PREF_CID);
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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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#if DEBUG
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#define DUMP_FONT_SIZES 0
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#endif
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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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//
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//------------------------------------------------------------------------------
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static PRBool gNavAlgorithmPref = PR_FALSE;
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static int PR_CALLBACK NavAlgorithmPrefChangedCallback(const char * name, void * closure)
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{
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nsresult rv;
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NS_WITH_SERVICE(nsIPref, prefs, kPrefCID, &rv);
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if (NS_SUCCEEDED(rv) && prefs) {
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prefs->GetBoolPref(name, &gNavAlgorithmPref);
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}
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return 0;
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}
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//------------------------------------------------------------------------------
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//
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//------------------------------------------------------------------------------
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static PRBool UseNewFontAlgorithm()
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{
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static PRBool once = PR_TRUE;
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if (once)
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{
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once = PR_FALSE;
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nsresult rv;
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NS_WITH_SERVICE(nsIPref, prefs, kPrefCID, &rv);
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if (NS_SUCCEEDED(rv) && prefs) {
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prefs->GetBoolPref("font.size.nav4algorithm", &gNavAlgorithmPref);
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prefs->RegisterCallback("font.size.nav4algorithm", NavAlgorithmPrefChangedCallback, NULL);
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}
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}
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return (gNavAlgorithmPref ? PR_FALSE : PR_TRUE);
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}
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//------------------------------------------------------------------------------
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//
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//------------------------------------------------------------------------------
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/*
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* Lifted from winfe/cxdc.cpp
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*/
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static nscoord OldCalcFontPointSize(PRInt32 aHTMLSize, PRInt32 aBasePointSize,
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float aScalingFactor)
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{ // lifted directly from Nav 5.0 code to replicate rounding errors
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double dFontSize;
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switch(aHTMLSize) {
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case 1:
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dFontSize = 7 * aBasePointSize / 10;
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break;
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case 2:
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dFontSize = 85 * aBasePointSize / 100;
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break;
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case 3:
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dFontSize = aBasePointSize;
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break;
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case 4:
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dFontSize = 12 * aBasePointSize / 10;
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break;
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case 5:
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dFontSize = 3 * aBasePointSize / 2;
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break;
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case 6:
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dFontSize = 2 * aBasePointSize;
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break;
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case 7:
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dFontSize = 3 * aBasePointSize;
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break;
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default:
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if (aHTMLSize < 1) {
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dFontSize = (7 * aBasePointSize / 10) / pow(1.1, 1 - aHTMLSize);
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}
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else { // 7 < aHTMLSize
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dFontSize = (3 * aBasePointSize) * pow(1.2, aHTMLSize - 7);
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}
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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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static nscoord NewCalcFontPointSize(PRInt32 aHTMLSize, PRInt32 aBasePointSize,
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float aScalingFactor, nsIPresContext* 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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float t2p;
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aPresContext->GetTwipsToPixels(&t2p);
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PRInt32 fontSize = NSTwipsToIntPixels(aBasePointSize, t2p);
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if ((fontSize >= sFontSizeTableMin) && (fontSize <= sFontSizeTableMax))
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{
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float p2t;
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aPresContext->GetPixelsToTwips(&p2t);
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PRInt32 row = fontSize - sFontSizeTableMin;
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nsCompatibility mode;
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aPresContext->GetCompatibilityMode(&mode);
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if (mode == eCompatibility_NavQuirks) {
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dFontSize = NSIntPixelsToTwips(sQuirksFontSizeTable[row][column[aHTMLSize]], p2t);
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} else {
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dFontSize = NSIntPixelsToTwips(sStrictFontSizeTable[row][column[aHTMLSize]], p2t);
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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::CalcFontPointSize(PRInt32 aHTMLSize, PRInt32 aBasePointSize,
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float aScalingFactor, nsIPresContext* aPresContext,
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nsFontSizeType aFontSizeType)
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{
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#if DUMP_FONT_SIZES
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extern void DumpFontSizes(nsIPresContext* aPresContext);
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DumpFontSizes(aPresContext);
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#endif
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if (UseNewFontAlgorithm())
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return NewCalcFontPointSize(aHTMLSize, aBasePointSize, aScalingFactor, aPresContext, aFontSizeType);
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else
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return OldCalcFontPointSize(aHTMLSize, aBasePointSize, aScalingFactor);
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}
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//------------------------------------------------------------------------------
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//
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//------------------------------------------------------------------------------
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PRInt32 nsStyleUtil::FindNextSmallerFontSize(nscoord aFontSize, PRInt32 aBasePointSize,
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float aScalingFactor, nsIPresContext* 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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PRInt32 fontSize = NSTwipsToFloorIntPoints(aFontSize);
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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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if (NSTwipsToFloorIntPoints(CalcFontPointSize(indexMin, aBasePointSize, aScalingFactor, aPresContext, aFontSizeType)) < fontSize) {
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if (fontSize <= NSTwipsToFloorIntPoints(CalcFontPointSize(indexMax, aBasePointSize, aScalingFactor, aPresContext, aFontSizeType))) { // in HTML table
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for (index = indexMax; index > indexMin; index--)
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if (fontSize > NSTwipsToFloorIntPoints(CalcFontPointSize(index, aBasePointSize, aScalingFactor, aPresContext, aFontSizeType)))
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break;
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}
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else { // larger than HTML table
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return indexMax;
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// for (index = 8; ; index++)
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// if (fontSize < NSTwipsToFloorIntPoints(CalcFontPointSize(index, aBasePointSize, aScalingFactor, aPresContext))) {
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// index--;
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// break;
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// }
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}
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}
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else { // smaller than HTML table
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return indexMin;
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// for (index = 0; -25<index ; index--) //prevent infinite loop (bug 17045)
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// if (fontSize > NSTwipsToFloorIntPoints(CalcFontPointSize(index, aBasePointSize, aScalingFactor, aPresContext))) {
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// break;
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// }
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}
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return index;
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}
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//------------------------------------------------------------------------------
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//
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//------------------------------------------------------------------------------
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PRInt32 nsStyleUtil::FindNextLargerFontSize(nscoord aFontSize, PRInt32 aBasePointSize,
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float aScalingFactor, nsIPresContext* 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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PRInt32 fontSize = NSTwipsToFloorIntPoints(aFontSize);
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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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if (NSTwipsToFloorIntPoints(CalcFontPointSize(indexMin, aBasePointSize, aScalingFactor, aPresContext, aFontSizeType)) <= fontSize) {
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if (fontSize < NSTwipsToFloorIntPoints(CalcFontPointSize(indexMax, aBasePointSize, aScalingFactor, aPresContext, aFontSizeType))) { // in HTML table
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for (index = indexMin; index < indexMax; index++)
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if (fontSize < NSTwipsToFloorIntPoints(CalcFontPointSize(index, aBasePointSize, aScalingFactor, aPresContext, aFontSizeType)))
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break;
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}
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else { // larger than HTML table
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return indexMax;
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// for (index = 8; ; index++)
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// if (fontSize < NSTwipsToFloorIntPoints(CalcFontPointSize(index, aBasePointSize, aScalingFactor, aPresContext)))
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// break;
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}
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}
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else { // smaller than HTML table
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return indexMin;
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// for (index = 0; -25<index ; index--) //prevent infinite loop (bug 17045)
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// if (fontSize > NSTwipsToFloorIntPoints(CalcFontPointSize(index, aBasePointSize, aScalingFactor, aPresContext))) {
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// index++;
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// break;
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// }
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}
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return index;
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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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//------------------------------------------------------------------------------
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//
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//------------------------------------------------------------------------------
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const nsStyleColor* nsStyleUtil::FindNonTransparentBackground(nsIStyleContext* aContext,
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PRBool aStartAtParent /*= PR_FALSE*/)
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{
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const nsStyleColor* result = nsnull;
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nsIStyleContext* context;
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if (aStartAtParent) {
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context = aContext->GetParent(); // balance ending release
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} else {
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context = aContext;
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NS_IF_ADDREF(context); // balance ending release
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}
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NS_ASSERTION( context != nsnull, "Cannot find NonTransparentBackground in a null context" );
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while (nsnull != context) {
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result = (const nsStyleColor*)context->GetStyleData(eStyleStruct_Color);
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if (0 == (result->mBackgroundFlags & NS_STYLE_BG_COLOR_TRANSPARENT)) {
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break;
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}
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else {
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nsIStyleContext* last = context;
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context = context->GetParent();
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NS_RELEASE(last);
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}
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}
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NS_IF_RELEASE(context);
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return result;
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}
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//------------------------------------------------------------------------------
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//
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//------------------------------------------------------------------------------
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#if DUMP_FONT_SIZES
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#include "nsIDeviceContext.h"
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PRInt32 RoundSize(nscoord aVal, nsIPresContext* aPresContext, bool aWinRounding)
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{
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PRInt32 lfHeight;
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nsIDeviceContext* dc;
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aPresContext->GetDeviceContext(&dc);
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float app2dev, app2twip, scale;
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dc->GetAppUnitsToDevUnits(app2dev);
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if (aWinRounding)
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{
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dc->GetDevUnitsToTwips(app2twip);
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dc->GetCanonicalPixelScale(scale);
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app2twip *= app2dev * scale;
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// This interesting bit of code rounds the font size off to the floor point
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// value. This is necessary for proper font scaling under windows.
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PRInt32 sizePoints = NSTwipsToFloorIntPoints(nscoord(aVal*app2twip));
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float rounded = ((float)NSIntPointsToTwips(sizePoints)) / app2twip;
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// round font size off to floor point size to be windows compatible
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// this is proper (windows) rounding
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// lfHeight = NSToIntRound(rounded * app2dev);
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// this floor rounding is to make ours compatible with Nav 4.0
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lfHeight = long(rounded * app2dev);
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return lfHeight;
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}
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else
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return NSToIntRound(aVal*app2dev);
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}
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#endif
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//------------------------------------------------------------------------------
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//
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//------------------------------------------------------------------------------
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#if DUMP_FONT_SIZES
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void DumpFontSizes(nsIPresContext* aPresContext)
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{
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static gOnce = true;
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if (gOnce)
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{
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gOnce = false;
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PRInt32 baseSize;
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PRInt32 htmlSize;
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PRInt32 cssSize;
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nscoord val;
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nscoord oldVal;
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nsIDeviceContext* dc;
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aPresContext->GetDeviceContext(&dc);
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float dev2app;
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dc->GetDevUnitsToAppUnits(dev2app);
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bool doWinRounding = true;
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for (short i=0; i<2; i ++)
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{
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doWinRounding ^= true;
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printf("\n\n\n");
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printf("---------------------------------------------------------------\n");
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printf(" CSS \n");
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printf(" Rounding %s\n", (doWinRounding ? "ON" : "OFF"));
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printf("---------------------------------------------------------------\n");
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printf("\n");
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printf("NEW SIZES:\n");
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printf("----------\n");
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printf(" xx-small x-small small medium large x-large xx-large\n");
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for (baseSize = 9; baseSize <= 20; baseSize++) {
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printf("%2d: ", baseSize);
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for (cssSize = 0; cssSize <= 6; cssSize++) {
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val = NewCalcFontPointSize(cssSize, baseSize*dev2app, 1.0f, aPresContext, eFontSize_CSS);
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printf("%2d ", RoundSize(val, aPresContext, false));
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}
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printf("\n");
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}
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printf("\n");
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printf("OLD SIZES:\n");
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printf("----------\n");
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printf(" xx-small x-small small medium large x-large xx-large\n");
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for (baseSize = 9; baseSize <= 20; baseSize++) {
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printf("%2d: ", baseSize);
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for (cssSize = 0; cssSize <= 6; cssSize++) {
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val = OldCalcFontPointSize(cssSize, baseSize*dev2app, 1.0f);
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printf("%2d ", RoundSize(val, aPresContext, doWinRounding));
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}
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printf("\n");
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}
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printf("\n");
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printf("DIFFS:\n");
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printf("------\n");
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printf(" xx-small x-small small medium large x-large xx-large\n");
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for (baseSize = 9; baseSize <= 20; baseSize++) {
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printf("%2d: ", baseSize);
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for (cssSize = 0; cssSize <= 6; cssSize++) {
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oldVal = OldCalcFontPointSize(cssSize, baseSize*dev2app, 1.0f);
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val = NewCalcFontPointSize(cssSize, baseSize*dev2app, 1.0f, aPresContext, eFontSize_CSS);
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if (RoundSize(oldVal, aPresContext, doWinRounding) <= 8)
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printf(" .");
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else
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printf("%2d", (RoundSize(val, aPresContext, false)-RoundSize(oldVal, aPresContext, doWinRounding)));
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printf(" ");
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}
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printf("\n");
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}
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printf("\n\n\n");
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printf("---------------------------------------------------------------\n");
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printf(" HTML \n");
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printf(" Rounding %s\n", (doWinRounding ? "ON" : "OFF"));
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printf("---------------------------------------------------------------\n");
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printf("\n");
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printf("NEW SIZES:\n");
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printf("----------\n");
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printf(" #1 #2 #3 #4 #5 #6 #7\n");
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for (baseSize = 9; baseSize <= 20; baseSize++) {
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printf("%2d: ", baseSize);
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for (htmlSize = 1; htmlSize <= 7; htmlSize++) {
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val = NewCalcFontPointSize(htmlSize, baseSize*dev2app, 1.0f, aPresContext, eFontSize_HTML);
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printf("%2d ", RoundSize(val, aPresContext, false));
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}
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printf("\n");
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}
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printf("\n");
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printf("OLD SIZES:\n");
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printf("----------\n");
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printf(" #1 #2 #3 #4 #5 #6 #7\n");
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for (baseSize = 9; baseSize <= 20; baseSize++) {
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printf("%2d: ", baseSize);
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for (htmlSize = 1; htmlSize <= 7; htmlSize++) {
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val = OldCalcFontPointSize(htmlSize, baseSize*dev2app, 1.0f);
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printf("%2d ", RoundSize(val, aPresContext, doWinRounding));
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}
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printf("\n");
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}
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printf("\n");
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printf("DIFFS:\n");
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printf("------\n");
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printf(" #1 #2 #3 #4 #5 #6 #7\n");
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for (baseSize = 9; baseSize <= 20; baseSize++) {
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printf("%2d: ", baseSize);
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for (htmlSize = 1; htmlSize <= 7; htmlSize++) {
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oldVal = OldCalcFontPointSize(htmlSize, baseSize*dev2app, 1.0f);
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val = NewCalcFontPointSize(htmlSize, baseSize*dev2app, 1.0f, aPresContext, eFontSize_HTML);
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if (RoundSize(oldVal, aPresContext, doWinRounding) <= 8)
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printf(" .");
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else
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printf("%2d", (RoundSize(val, aPresContext, false)-RoundSize(oldVal, aPresContext, doWinRounding)));
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printf(" ");
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}
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printf("\n");
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}
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printf("\n\n\n");
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}
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}
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}
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#endif
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