mirror of
https://gitlab.winehq.org/wine/wine-gecko.git
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5a4a96e54e
--HG-- rename : gfx/src/nsThebesRenderingContext.cpp => gfx/src/nsRenderingContext.cpp rename : gfx/src/nsThebesRenderingContext.h => gfx/src/nsRenderingContext.h extra : rebase_source : b2911406bbe1b5995d1a501c59e02b5fffefa390
425 lines
15 KiB
C++
425 lines
15 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 MathML Project.
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*
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* The Initial Developer of the Original Code is
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* The University of Queensland.
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* Portions created by the Initial Developer are Copyright (C) 1999
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* the Initial Developer. All Rights Reserved.
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*
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* Contributor(s):
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* Roger B. Sidje <rbs@maths.uq.edu.au>
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* Karl Tomlinson <karlt+@karlt.net>, Mozilla Corporation
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*
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* Alternatively, the contents of this file may be used under the terms of
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* either the GNU General Public License Version 2 or later (the "GPL"), or
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* the GNU Lesser General Public License Version 2.1 or later (the "LGPL"),
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* in which case the provisions of the GPL or the LGPL are applicable instead
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* of those above. If you wish to allow use of your version of this file only
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* under the terms of either the GPL or the LGPL, and not to allow others to
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* use your version of this file under the terms of the MPL, indicate your
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* decision by deleting the provisions above and replace them with the notice
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* and other provisions required by the GPL or the LGPL. If you do not delete
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* the provisions above, a recipient may use your version of this file under
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* the terms of any one of the MPL, the GPL or the LGPL.
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*
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* ***** END LICENSE BLOCK ***** */
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#include "nsCOMPtr.h"
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#include "nsFrame.h"
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#include "nsPresContext.h"
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#include "nsStyleContext.h"
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#include "nsStyleConsts.h"
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#include "nsRenderingContext.h"
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#include "nsIFontMetrics.h"
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#include "nsContentUtils.h"
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#include "nsCSSFrameConstructor.h"
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#include "nsMathMLTokenFrame.h"
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nsIFrame*
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NS_NewMathMLTokenFrame(nsIPresShell* aPresShell, nsStyleContext* aContext)
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{
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return new (aPresShell) nsMathMLTokenFrame(aContext);
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}
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NS_IMPL_FRAMEARENA_HELPERS(nsMathMLTokenFrame)
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nsMathMLTokenFrame::~nsMathMLTokenFrame()
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{
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}
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eMathMLFrameType
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nsMathMLTokenFrame::GetMathMLFrameType()
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{
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// treat everything other than <mi> as ordinary...
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if (mContent->Tag() != nsGkAtoms::mi_) {
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return eMathMLFrameType_Ordinary;
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}
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// for <mi>, distinguish between italic and upright...
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// Don't use nsMathMLFrame::GetAttribute for mathvariant or fontstyle as
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// default values are not inherited.
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nsAutoString style;
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// mathvariant overrides fontstyle
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// http://www.w3.org/TR/2003/REC-MathML2-20031021/chapter3.html#presm.deprecatt
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mContent->GetAttr(kNameSpaceID_None,
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nsGkAtoms::_moz_math_fontstyle_, style) ||
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mContent->GetAttr(kNameSpaceID_None, nsGkAtoms::mathvariant_, style) ||
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mContent->GetAttr(kNameSpaceID_None, nsGkAtoms::fontstyle_, style);
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if (style.EqualsLiteral("italic") || style.EqualsLiteral("bold-italic") ||
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style.EqualsLiteral("script") || style.EqualsLiteral("bold-script") ||
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style.EqualsLiteral("sans-serif-italic") ||
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style.EqualsLiteral("sans-serif-bold-italic")) {
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return eMathMLFrameType_ItalicIdentifier;
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}
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else if(style.EqualsLiteral("invariant")) {
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nsAutoString data;
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nsContentUtils::GetNodeTextContent(mContent, PR_FALSE, data);
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eMATHVARIANT variant = nsMathMLOperators::LookupInvariantChar(data);
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switch (variant) {
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case eMATHVARIANT_italic:
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case eMATHVARIANT_bold_italic:
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case eMATHVARIANT_script:
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case eMATHVARIANT_bold_script:
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case eMATHVARIANT_sans_serif_italic:
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case eMATHVARIANT_sans_serif_bold_italic:
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return eMathMLFrameType_ItalicIdentifier;
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default:
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; // fall through to upright
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}
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}
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return eMathMLFrameType_UprightIdentifier;
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}
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static void
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CompressWhitespace(nsIContent* aContent)
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{
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PRUint32 numKids = aContent->GetChildCount();
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for (PRUint32 kid = 0; kid < numKids; kid++) {
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nsIContent* cont = aContent->GetChildAt(kid);
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if (cont && cont->IsNodeOfType(nsINode::eTEXT)) {
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nsAutoString text;
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cont->AppendTextTo(text);
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text.CompressWhitespace();
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cont->SetText(text, PR_FALSE); // not meant to be used if notify is needed
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}
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}
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}
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NS_IMETHODIMP
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nsMathMLTokenFrame::Init(nsIContent* aContent,
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nsIFrame* aParent,
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nsIFrame* aPrevInFlow)
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{
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// leading and trailing whitespace doesn't count -- bug 15402
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// brute force removal for people who do <mi> a </mi> instead of <mi>a</mi>
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// XXX the best fix is to skip these in nsTextFrame
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CompressWhitespace(aContent);
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// let the base class do its Init()
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return nsMathMLContainerFrame::Init(aContent, aParent, aPrevInFlow);
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}
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NS_IMETHODIMP
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nsMathMLTokenFrame::SetInitialChildList(nsIAtom* aListName,
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nsFrameList& aChildList)
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{
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// First, let the base class do its work
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nsresult rv = nsMathMLContainerFrame::SetInitialChildList(aListName, aChildList);
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if (NS_FAILED(rv))
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return rv;
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SetQuotes(PR_FALSE);
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ProcessTextData();
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return rv;
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}
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nsresult
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nsMathMLTokenFrame::Reflow(nsPresContext* aPresContext,
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nsHTMLReflowMetrics& aDesiredSize,
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const nsHTMLReflowState& aReflowState,
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nsReflowStatus& aStatus)
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{
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nsresult rv = NS_OK;
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// initializations needed for empty markup like <mtag></mtag>
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aDesiredSize.width = aDesiredSize.height = 0;
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aDesiredSize.ascent = 0;
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aDesiredSize.mBoundingMetrics = nsBoundingMetrics();
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nsSize availSize(aReflowState.ComputedWidth(), NS_UNCONSTRAINEDSIZE);
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nsIFrame* childFrame = GetFirstChild(nsnull);
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while (childFrame) {
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// ask our children to compute their bounding metrics
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nsHTMLReflowMetrics childDesiredSize(aDesiredSize.mFlags
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| NS_REFLOW_CALC_BOUNDING_METRICS);
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nsHTMLReflowState childReflowState(aPresContext, aReflowState,
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childFrame, availSize);
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rv = ReflowChild(childFrame, aPresContext, childDesiredSize,
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childReflowState, aStatus);
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//NS_ASSERTION(NS_FRAME_IS_COMPLETE(aStatus), "bad status");
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if (NS_FAILED(rv)) {
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// Call DidReflow() for the child frames we successfully did reflow.
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DidReflowChildren(GetFirstChild(nsnull), childFrame);
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return rv;
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}
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SaveReflowAndBoundingMetricsFor(childFrame, childDesiredSize,
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childDesiredSize.mBoundingMetrics);
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childFrame = childFrame->GetNextSibling();
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}
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// place and size children
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FinalizeReflow(*aReflowState.rendContext, aDesiredSize);
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aStatus = NS_FRAME_COMPLETE;
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NS_FRAME_SET_TRUNCATION(aStatus, aReflowState, aDesiredSize);
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return NS_OK;
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}
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// For token elements, mBoundingMetrics is computed at the ReflowToken
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// pass, it is not computed here because our children may be text frames
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// that do not implement the GetBoundingMetrics() interface.
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/* virtual */ nsresult
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nsMathMLTokenFrame::Place(nsRenderingContext& aRenderingContext,
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PRBool aPlaceOrigin,
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nsHTMLReflowMetrics& aDesiredSize)
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{
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mBoundingMetrics = nsBoundingMetrics();
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for (nsIFrame* childFrame = GetFirstChild(nsnull); childFrame;
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childFrame = childFrame->GetNextSibling()) {
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nsHTMLReflowMetrics childSize;
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GetReflowAndBoundingMetricsFor(childFrame, childSize,
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childSize.mBoundingMetrics, nsnull);
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// compute and cache the bounding metrics
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mBoundingMetrics += childSize.mBoundingMetrics;
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}
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nsCOMPtr<nsIFontMetrics> fm =
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PresContext()->GetMetricsFor(GetStyleFont()->mFont);
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nscoord ascent, descent;
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fm->GetMaxAscent(ascent);
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fm->GetMaxDescent(descent);
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aDesiredSize.mBoundingMetrics = mBoundingMetrics;
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aDesiredSize.width = mBoundingMetrics.width;
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aDesiredSize.ascent = NS_MAX(mBoundingMetrics.ascent, ascent);
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aDesiredSize.height = aDesiredSize.ascent +
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NS_MAX(mBoundingMetrics.descent, descent);
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if (aPlaceOrigin) {
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nscoord dy, dx = 0;
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for (nsIFrame* childFrame = GetFirstChild(nsnull); childFrame;
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childFrame = childFrame->GetNextSibling()) {
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nsHTMLReflowMetrics childSize;
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GetReflowAndBoundingMetricsFor(childFrame, childSize,
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childSize.mBoundingMetrics);
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// place and size the child; (dx,0) makes the caret happy - bug 188146
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dy = childSize.height == 0 ? 0 : aDesiredSize.ascent - childSize.ascent;
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FinishReflowChild(childFrame, PresContext(), nsnull, childSize, dx, dy, 0);
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dx += childSize.width;
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}
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}
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SetReference(nsPoint(0, aDesiredSize.ascent));
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return NS_OK;
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}
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/* virtual */ void
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nsMathMLTokenFrame::MarkIntrinsicWidthsDirty()
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{
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// this could be called due to changes in the nsTextFrame beneath us
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// when something changed in the text content. So re-process our text
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ProcessTextData();
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nsMathMLContainerFrame::MarkIntrinsicWidthsDirty();
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}
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NS_IMETHODIMP
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nsMathMLTokenFrame::AttributeChanged(PRInt32 aNameSpaceID,
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nsIAtom* aAttribute,
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PRInt32 aModType)
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{
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if (nsGkAtoms::lquote_ == aAttribute ||
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nsGkAtoms::rquote_ == aAttribute) {
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SetQuotes(PR_TRUE);
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}
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return nsMathMLContainerFrame::
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AttributeChanged(aNameSpaceID, aAttribute, aModType);
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}
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void
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nsMathMLTokenFrame::ProcessTextData()
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{
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// see if the style changes from normal to italic or vice-versa
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if (!SetTextStyle())
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return;
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// explicitly request a re-resolve to pick up the change of style
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PresContext()->PresShell()->FrameConstructor()->
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PostRestyleEvent(mContent->AsElement(), eRestyle_Subtree, NS_STYLE_HINT_NONE);
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}
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///////////////////////////////////////////////////////////////////////////
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// For <mi>, if the content is not a single character, turn the font to
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// normal (this function will also query attributes from the mstyle hierarchy)
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// Returns PR_TRUE if there is a style change.
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//
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// http://www.w3.org/TR/2003/REC-MathML2-20031021/chapter3.html#presm.commatt
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//
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// "It is important to note that only certain combinations of
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// character data and mathvariant attribute values make sense.
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// ...
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// By design, the only cases that have an unambiguous
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// interpretation are exactly the ones that correspond to SMP Math
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// Alphanumeric Symbol characters, which are enumerated in Section
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// 6.2.3 Mathematical Alphanumeric Symbols Characters. In all other
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// cases, it is suggested that renderers ignore the value of the
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// mathvariant attribute if it is present."
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//
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// There are no corresponding characters for mathvariant=normal, suggesting
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// that this value should be ignored, but this (from the same section of
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// Chapter 3) implies that font-style should not be inherited, but set to
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// normal for mathvariant=normal:
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//
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// "In particular, inheritance of the mathvariant attribute does not follow
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// the CSS model. The default value for this attribute is "normal"
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// (non-slanted) for all tokens except mi. ... (The deprecated fontslant
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// attribute also behaves this way.)"
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PRBool
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nsMathMLTokenFrame::SetTextStyle()
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{
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if (mContent->Tag() != nsGkAtoms::mi_)
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return PR_FALSE;
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if (!mFrames.FirstChild())
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return PR_FALSE;
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// Get the text content that we enclose and its length
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nsAutoString data;
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nsContentUtils::GetNodeTextContent(mContent, PR_FALSE, data);
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PRInt32 length = data.Length();
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if (!length)
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return PR_FALSE;
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nsAutoString fontstyle;
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PRBool isSingleCharacter =
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length == 1 ||
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(length == 2 && NS_IS_HIGH_SURROGATE(data[0]));
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if (isSingleCharacter &&
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nsMathMLOperators::LookupInvariantChar(data) != eMATHVARIANT_NONE) {
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// bug 65951 - a non-stylable character has its own intrinsic appearance
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fontstyle.AssignLiteral("invariant");
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}
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else {
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// Attributes override the default behavior.
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if (!(mContent->HasAttr(kNameSpaceID_None, nsGkAtoms::mathvariant_) ||
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mContent->HasAttr(kNameSpaceID_None, nsGkAtoms::fontstyle_))) {
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if (!isSingleCharacter) {
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fontstyle.AssignLiteral("normal");
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}
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else if (length == 1 && // BMP
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!nsMathMLOperators::
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TransformVariantChar(data[0], eMATHVARIANT_italic).
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Equals(data)) {
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// Transformation exists. Try to make the BMP character look like the
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// styled character using the style system until bug 114365 is resolved.
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fontstyle.AssignLiteral("italic");
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}
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// else single character but there is no corresponding Math Alphanumeric
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// Symbol character: "ignore the value of the [default] mathvariant
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// attribute".
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}
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}
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// set the _moz-math-font-style attribute without notifying that we want a reflow
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if (fontstyle.IsEmpty()) {
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if (mContent->HasAttr(kNameSpaceID_None, nsGkAtoms::_moz_math_fontstyle_)) {
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mContent->UnsetAttr(kNameSpaceID_None, nsGkAtoms::_moz_math_fontstyle_,
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PR_FALSE);
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return PR_TRUE;
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}
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}
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else if (!mContent->AttrValueIs(kNameSpaceID_None,
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nsGkAtoms::_moz_math_fontstyle_,
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fontstyle, eCaseMatters)) {
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mContent->SetAttr(kNameSpaceID_None, nsGkAtoms::_moz_math_fontstyle_,
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fontstyle, PR_FALSE);
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return PR_TRUE;
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}
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return PR_FALSE;
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}
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///////////////////////////////////////////////////////////////////////////
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// For <ms>, it is assumed that the mathml.css file contains two rules:
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// ms:before { content: open-quote; }
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// ms:after { content: close-quote; }
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// With these two rules, the frame construction code will
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// create inline frames that contain text frames which themselves
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// contain the text content of the quotes.
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// So the main idea in this code is to see if there are lquote and
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// rquote attributes. If these are there, we ovewrite the default
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// quotes in the text frames.
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// XXX this is somewhat bogus, we probably should map lquote and rquote
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// to 'content' style rules
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//
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// But what if the mathml.css file wasn't loaded?
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// We also check that we are not relying on null pointers...
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static void
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SetQuote(nsIFrame* aFrame, nsString& aValue, PRBool aNotify)
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{
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if (!aFrame)
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return;
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nsIFrame* textFrame = aFrame->GetFirstChild(nsnull);
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if (!textFrame)
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return;
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nsIContent* quoteContent = textFrame->GetContent();
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if (!quoteContent->IsNodeOfType(nsINode::eTEXT))
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return;
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quoteContent->SetText(aValue, aNotify);
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}
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void
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nsMathMLTokenFrame::SetQuotes(PRBool aNotify)
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{
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if (mContent->Tag() != nsGkAtoms::ms_)
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return;
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nsAutoString value;
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// lquote
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if (GetAttribute(mContent, mPresentationData.mstyle,
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nsGkAtoms::lquote_, value)) {
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SetQuote(nsLayoutUtils::GetBeforeFrame(this), value, aNotify);
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}
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// rquote
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if (GetAttribute(mContent, mPresentationData.mstyle,
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nsGkAtoms::rquote_, value)) {
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SetQuote(nsLayoutUtils::GetAfterFrame(this), value, aNotify);
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}
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}
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