mirror of
https://gitlab.winehq.org/wine/wine-gecko.git
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2c717f398d
This changes a number of callers that were previously bypassing the use of the correct language (with either no language or the charset-detected language on the pres context via nsPresContext::GetMetricsFor) and/or the correct user font set to pass the correct values, which should improve the correctness of the behavior of whatever they were using the fonts for, and also reduce the number of unique sets of font metrics requested (which helps nsFontCache effectiveness).
416 lines
14 KiB
C++
416 lines
14 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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*
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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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#ifndef nsMathMLFrame_h___
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#define nsMathMLFrame_h___
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#include "nsCOMPtr.h"
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#include "nsPresContext.h"
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#include "nsFontMetrics.h"
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#include "nsStyleContext.h"
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#include "nsMathMLAtoms.h"
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#include "nsMathMLOperators.h"
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#include "nsIMathMLFrame.h"
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#include "nsFrame.h"
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#include "nsCSSValue.h"
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#include "nsMathMLElement.h"
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#include "nsLayoutUtils.h"
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class nsMathMLChar;
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// Concrete base class with default methods that derived MathML frames can override
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class nsMathMLFrame : public nsIMathMLFrame {
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public:
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// nsIMathMLFrame ---
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virtual PRBool
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IsSpaceLike() {
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return NS_MATHML_IS_SPACE_LIKE(mPresentationData.flags);
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}
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NS_IMETHOD
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GetBoundingMetrics(nsBoundingMetrics& aBoundingMetrics) {
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aBoundingMetrics = mBoundingMetrics;
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return NS_OK;
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}
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NS_IMETHOD
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SetBoundingMetrics(const nsBoundingMetrics& aBoundingMetrics) {
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mBoundingMetrics = aBoundingMetrics;
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return NS_OK;
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}
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NS_IMETHOD
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SetReference(const nsPoint& aReference) {
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mReference = aReference;
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return NS_OK;
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}
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virtual eMathMLFrameType GetMathMLFrameType();
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NS_IMETHOD
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Stretch(nsRenderingContext& aRenderingContext,
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nsStretchDirection aStretchDirection,
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nsBoundingMetrics& aContainerSize,
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nsHTMLReflowMetrics& aDesiredStretchSize)
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{
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return NS_OK;
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}
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NS_IMETHOD
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GetEmbellishData(nsEmbellishData& aEmbellishData) {
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aEmbellishData = mEmbellishData;
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return NS_OK;
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}
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NS_IMETHOD
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GetPresentationData(nsPresentationData& aPresentationData) {
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aPresentationData = mPresentationData;
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return NS_OK;
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}
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NS_IMETHOD
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InheritAutomaticData(nsIFrame* aParent);
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NS_IMETHOD
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TransmitAutomaticData()
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{
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return NS_OK;
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}
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NS_IMETHOD
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UpdatePresentationData(PRUint32 aFlagsValues,
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PRUint32 aFlagsToUpdate);
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NS_IMETHOD
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UpdatePresentationDataFromChildAt(PRInt32 aFirstIndex,
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PRInt32 aLastIndex,
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PRUint32 aFlagsValues,
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PRUint32 aFlagsToUpdate)
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{
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return NS_OK;
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}
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// helper to give a style context suitable for doing the stretching to the
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// MathMLChar. Frame classes that use this should make the extra style contexts
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// accessible to the Style System via Get/Set AdditionalStyleContext.
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static void
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ResolveMathMLCharStyle(nsPresContext* aPresContext,
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nsIContent* aContent,
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nsStyleContext* aParenStyleContext,
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nsMathMLChar* aMathMLChar,
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PRBool aIsMutableChar);
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// helper to get the mEmbellishData of a frame
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// The MathML REC precisely defines an "embellished operator" as:
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// - an <mo> element;
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// - or one of the elements <msub>, <msup>, <msubsup>, <munder>, <mover>,
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// <munderover>, <mmultiscripts>, <mfrac>, or <semantics>, whose first
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// argument exists and is an embellished operator;
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//- or one of the elements <mstyle>, <mphantom>, or <mpadded>, such that
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// an <mrow> containing the same arguments would be an embellished
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// operator;
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// - or an <maction> element whose selected subexpression exists and is an
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// embellished operator;
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// - or an <mrow> whose arguments consist (in any order) of one embellished
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// operator and zero or more spacelike elements.
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static void
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GetEmbellishDataFrom(nsIFrame* aFrame,
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nsEmbellishData& aEmbellishData);
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// helper to get the presentation data of a frame. If aClimbTree is
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// set to true and the frame happens to be surrounded by non-MathML
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// helper frames needed for its support, we walk up the frame hierarchy
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// until we reach a MathML ancestor or the <root> math element.
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static void
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GetPresentationDataFrom(nsIFrame* aFrame,
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nsPresentationData& aPresentationData,
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PRBool aClimbTree = PR_TRUE);
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// helper used by <mstyle> and <mtable> to see if they have a displaystyle attribute
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static void
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FindAttrDisplaystyle(nsIContent* aContent,
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nsPresentationData& aPresentationData);
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// helper to check if a content has an attribute. If content is nsnull or if
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// the attribute is not there, check if the attribute is on the mstyle hierarchy
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// @return PR_TRUE --if attribute exists
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// PR_FALSE --if attribute doesn't exist
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static PRBool
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GetAttribute(nsIContent* aContent,
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nsIFrame* aMathMLmstyleFrame,
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nsIAtom* aAttributeAtom,
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nsString& aValue);
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// utilities to parse and retrieve numeric values in CSS units
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// All values are stored in twips.
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static PRBool
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ParseNumericValue(const nsString& aString,
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nsCSSValue& aCSSValue) {
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return nsMathMLElement::ParseNumericValue(aString, aCSSValue,
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nsMathMLElement::PARSE_ALLOW_NEGATIVE |
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nsMathMLElement::PARSE_ALLOW_UNITLESS);
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}
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static nscoord
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CalcLength(nsPresContext* aPresContext,
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nsStyleContext* aStyleContext,
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const nsCSSValue& aCSSValue);
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static PRBool
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ParseNamedSpaceValue(nsIFrame* aMathMLmstyleFrame,
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nsString& aString,
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nsCSSValue& aCSSValue);
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static eMathMLFrameType
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GetMathMLFrameTypeFor(nsIFrame* aFrame)
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{
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if (aFrame->IsFrameOfType(nsIFrame::eMathML)) {
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nsIMathMLFrame* mathMLFrame = do_QueryFrame(aFrame);
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if (mathMLFrame)
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return mathMLFrame->GetMathMLFrameType();
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}
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return eMathMLFrameType_UNKNOWN;
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}
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// estimate of the italic correction
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static void
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GetItalicCorrection(nsBoundingMetrics& aBoundingMetrics,
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nscoord& aItalicCorrection)
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{
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aItalicCorrection = aBoundingMetrics.rightBearing - aBoundingMetrics.width;
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if (0 > aItalicCorrection) {
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aItalicCorrection = 0;
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}
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}
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static void
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GetItalicCorrection(nsBoundingMetrics& aBoundingMetrics,
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nscoord& aLeftItalicCorrection,
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nscoord& aRightItalicCorrection)
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{
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aRightItalicCorrection = aBoundingMetrics.rightBearing - aBoundingMetrics.width;
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if (0 > aRightItalicCorrection) {
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aRightItalicCorrection = 0;
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}
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aLeftItalicCorrection = -aBoundingMetrics.leftBearing;
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if (0 > aLeftItalicCorrection) {
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aLeftItalicCorrection = 0;
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}
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}
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// helper methods for getting sup/subdrop's from a child
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static void
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GetSubDropFromChild(nsIFrame* aChild,
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nscoord& aSubDrop)
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{
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nsRefPtr<nsFontMetrics> fm;
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nsLayoutUtils::GetFontMetricsForFrame(aChild, getter_AddRefs(fm));
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GetSubDrop(fm, aSubDrop);
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}
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static void
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GetSupDropFromChild(nsIFrame* aChild,
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nscoord& aSupDrop)
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{
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nsRefPtr<nsFontMetrics> fm;
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nsLayoutUtils::GetFontMetricsForFrame(aChild, getter_AddRefs(fm));
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GetSupDrop(fm, aSupDrop);
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}
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static void
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GetSkewCorrectionFromChild(nsIFrame* aChild,
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nscoord& aSkewCorrection)
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{
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// default is 0
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// individual classes should over-ride this method if necessary
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aSkewCorrection = 0;
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}
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// 2 levels of subscript shifts
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static void
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GetSubScriptShifts(nsFontMetrics* fm,
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nscoord& aSubScriptShift1,
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nscoord& aSubScriptShift2)
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{
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nscoord xHeight = fm->XHeight();
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aSubScriptShift1 = NSToCoordRound(150.000f/430.556f * xHeight);
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aSubScriptShift2 = NSToCoordRound(247.217f/430.556f * xHeight);
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}
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// 3 levels of superscript shifts
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static void
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GetSupScriptShifts(nsFontMetrics* fm,
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nscoord& aSupScriptShift1,
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nscoord& aSupScriptShift2,
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nscoord& aSupScriptShift3)
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{
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nscoord xHeight = fm->XHeight();
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aSupScriptShift1 = NSToCoordRound(412.892f/430.556f * xHeight);
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aSupScriptShift2 = NSToCoordRound(362.892f/430.556f * xHeight);
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aSupScriptShift3 = NSToCoordRound(288.889f/430.556f * xHeight);
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}
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// these are TeX specific params not found in ordinary fonts
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static void
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GetSubDrop(nsFontMetrics* fm,
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nscoord& aSubDrop)
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{
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nscoord xHeight = fm->XHeight();
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aSubDrop = NSToCoordRound(50.000f/430.556f * xHeight);
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}
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static void
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GetSupDrop(nsFontMetrics* fm,
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nscoord& aSupDrop)
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{
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nscoord xHeight = fm->XHeight();
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aSupDrop = NSToCoordRound(386.108f/430.556f * xHeight);
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}
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static void
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GetNumeratorShifts(nsFontMetrics* fm,
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nscoord& numShift1,
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nscoord& numShift2,
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nscoord& numShift3)
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{
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nscoord xHeight = fm->XHeight();
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numShift1 = NSToCoordRound(676.508f/430.556f * xHeight);
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numShift2 = NSToCoordRound(393.732f/430.556f * xHeight);
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numShift3 = NSToCoordRound(443.731f/430.556f * xHeight);
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}
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static void
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GetDenominatorShifts(nsFontMetrics* fm,
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nscoord& denShift1,
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nscoord& denShift2)
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{
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nscoord xHeight = fm->XHeight();
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denShift1 = NSToCoordRound(685.951f/430.556f * xHeight);
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denShift2 = NSToCoordRound(344.841f/430.556f * xHeight);
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}
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static void
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GetEmHeight(nsFontMetrics* fm,
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nscoord& emHeight)
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{
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#if 0
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// should switch to this API in order to scale with changes of TextZoom
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emHeight = fm->EmHeight();
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#else
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emHeight = NSToCoordRound(float(fm->Font().size));
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#endif
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}
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static void
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GetAxisHeight (nsFontMetrics* fm,
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nscoord& axisHeight)
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{
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axisHeight = NSToCoordRound(250.000f/430.556f * fm->XHeight());
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}
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static void
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GetBigOpSpacings(nsFontMetrics* fm,
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nscoord& bigOpSpacing1,
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nscoord& bigOpSpacing2,
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nscoord& bigOpSpacing3,
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nscoord& bigOpSpacing4,
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nscoord& bigOpSpacing5)
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{
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nscoord xHeight = fm->XHeight();
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bigOpSpacing1 = NSToCoordRound(111.111f/430.556f * xHeight);
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bigOpSpacing2 = NSToCoordRound(166.667f/430.556f * xHeight);
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bigOpSpacing3 = NSToCoordRound(200.000f/430.556f * xHeight);
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bigOpSpacing4 = NSToCoordRound(600.000f/430.556f * xHeight);
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bigOpSpacing5 = NSToCoordRound(100.000f/430.556f * xHeight);
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}
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static void
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GetRuleThickness(nsFontMetrics* fm,
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nscoord& ruleThickness)
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{
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nscoord xHeight = fm->XHeight();
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ruleThickness = NSToCoordRound(40.000f/430.556f * xHeight);
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}
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// Some parameters are not accurately obtained using the x-height.
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// Here are some slower variants to obtain the desired metrics
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// by actually measuring some characters
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static void
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GetRuleThickness(nsRenderingContext& aRenderingContext,
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nsFontMetrics* aFontMetrics,
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nscoord& aRuleThickness);
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static void
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GetAxisHeight(nsRenderingContext& aRenderingContext,
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nsFontMetrics* aFontMetrics,
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nscoord& aAxisHeight);
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protected:
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#if defined(NS_DEBUG) && defined(SHOW_BOUNDING_BOX)
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nsresult DisplayBoundingMetrics(nsDisplayListBuilder* aBuilder,
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nsIFrame* aFrame, const nsPoint& aPt,
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const nsBoundingMetrics& aMetrics,
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const nsDisplayListSet& aLists);
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#endif
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/**
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* Display a solid rectangle in the frame's text color. Used for drawing
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* fraction separators and root/sqrt overbars.
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*/
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nsresult DisplayBar(nsDisplayListBuilder* aBuilder,
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nsIFrame* aFrame, const nsRect& aRect,
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const nsDisplayListSet& aLists);
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// information about the presentation policy of the frame
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nsPresentationData mPresentationData;
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// information about a container that is an embellished operator
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nsEmbellishData mEmbellishData;
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// Metrics that _exactly_ enclose the text of the frame
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nsBoundingMetrics mBoundingMetrics;
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// Reference point of the frame: mReference.y is the baseline
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nsPoint mReference;
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};
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#endif /* nsMathMLFrame_h___ */
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