зеркало из https://github.com/mozilla/pjs.git
139 строки
3.5 KiB
C++
139 строки
3.5 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 License
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* Version 1.0 (the "NPL"); you may not use this file except in
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* compliance with the NPL. You may obtain a copy of the NPL at
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* http://www.mozilla.org/NPL/
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*
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* Software distributed under the NPL is distributed on an "AS IS" basis,
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* WITHOUT WARRANTY OF ANY KIND, either express or implied. See the NPL
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* for the specific language governing rights and limitations under the
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* NPL.
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*
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* The Initial Developer of this code under the NPL is Netscape
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* Communications Corporation. Portions created by Netscape are
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* Copyright (C) 1998 Netscape Communications Corporation. All Rights
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* Reserved.
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*/
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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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#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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* 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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* Lifted from winfe/cxdc.cpp
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*/
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nscoord nsStyleUtil::CalcFontPointSize(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 0:
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dFontSize = aBasePointSize / 2;
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break;
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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 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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case 8:
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dFontSize = 4 * aBasePointSize;
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break;
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case 3:
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default:
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dFontSize = aBasePointSize;
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}
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dFontSize *= aScalingFactor;
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return (nscoord)dFontSize;
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}
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PRInt32 nsStyleUtil::FindNextSmallerFontSize(nscoord aFontSize, PRInt32 aBasePointSize,
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float aScalingFactor)
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{
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PRInt32 index;
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for (index = 7; index > 1; index--)
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if (aFontSize > nsStyleUtil::CalcFontPointSize(index, aBasePointSize, aScalingFactor))
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break;
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return index;
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}
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PRInt32 nsStyleUtil::FindNextLargerFontSize(nscoord aFontSize, PRInt32 aBasePointSize,
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float aScalingFactor)
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{
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PRInt32 index;
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for (index = 1; index < 7; index++)
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if (aFontSize < nsStyleUtil::CalcFontPointSize(index, aBasePointSize, aScalingFactor))
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break;
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return index;
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}
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const nsStyleColor* nsStyleUtil::FindNonTransparentBackground(nsIStyleContext* aContext)
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{
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const nsStyleColor* result = nsnull;
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nsIStyleContext* context = aContext;
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NS_IF_ADDREF(context); // balance ending release
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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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