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274 lines
9.6 KiB
C++
274 lines
9.6 KiB
C++
/* -*- Mode: C++; tab-width: 2; indent-tabs-mode: nil; c-basic-offset: 2 -*- */
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/* This Source Code Form is subject to the terms of the Mozilla Public
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* License, v. 2.0. If a copy of the MPL was not distributed with this
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* file, You can obtain one at http://mozilla.org/MPL/2.0/. */
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#ifndef nsMathMLChar_h___
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#define nsMathMLChar_h___
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#include "nsMathMLOperators.h"
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#include "nsMathMLFrame.h"
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class nsGlyphTable;
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// Hints for Stretch() to indicate criteria for stretching
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enum {
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// Don't stretch
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NS_STRETCH_NONE = 0x00,
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// Variable size stretches
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NS_STRETCH_VARIABLE_MASK = 0x0F,
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NS_STRETCH_NORMAL = 0x01, // try to stretch to requested size
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NS_STRETCH_NEARER = 0x02, // stretch very close to requested size
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NS_STRETCH_SMALLER = 0x04, // don't stretch more than requested size
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NS_STRETCH_LARGER = 0x08, // don't stretch less than requested size
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// A largeop in displaystyle
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NS_STRETCH_LARGEOP = 0x10,
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NS_STRETCH_INTEGRAL = 0x20,
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// Intended for internal use:
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// Find the widest metrics that might be returned from a vertical stretch
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NS_STRETCH_MAXWIDTH = 0x40
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};
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// A single glyph in our internal representation is characterized by a 'code@font'
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// pair. The 'code' is interpreted as a Unicode point or as the direct glyph index
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// (depending on the type of nsGlyphTable where this comes from). The 'font' is a
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// numeric identifier given to the font to which the glyph belongs.
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struct nsGlyphCode {
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PRUnichar code[2];
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PRInt32 font;
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PRInt32 Length() { return (code[1] == PRUnichar('\0') ? 1 : 2); }
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bool Exists() const
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{
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return (code[0] != 0);
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}
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bool operator==(const nsGlyphCode& other) const
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{
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return (other.code[0] == code[0] && other.code[1] == code[1] &&
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other.font == font);
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}
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bool operator!=(const nsGlyphCode& other) const
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{
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return ! operator==(other);
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}
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};
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// Class used to handle stretchy symbols (accent, delimiter and boundary symbols).
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// There are composite characters that need to be built recursively from other
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// characters. Since these are rare we use a light-weight mechanism to handle
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// them. Specifically, as need arises we append a singly-linked list of child
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// chars with their mParent pointing to the first element in the list, except in
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// the originating first element itself where it points to null. mSibling points
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// to the next element in the list. Since the originating first element is the
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// parent of the others, we call it the "root" char of the list. Testing !mParent
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// tells whether you are that "root" during the recursion. The parent delegates
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// most of the tasks to the children.
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class nsMathMLChar
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{
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public:
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// constructor and destructor
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nsMathMLChar(nsMathMLChar* aParent = nsnull) {
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MOZ_COUNT_CTOR(nsMathMLChar);
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mStyleContext = nsnull;
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mSibling = nsnull;
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mParent = aParent;
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mUnscaledAscent = 0;
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mScaleX = mScaleY = 1.0;
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mDrawNormal = true;
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mMirrored = false;
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}
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~nsMathMLChar() { // not a virtual destructor: this class is not intended to be subclassed
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MOZ_COUNT_DTOR(nsMathMLChar);
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// there is only one style context owned by the "root" char
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// and it may be used by child chars as well
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if (!mParent && mStyleContext) { // only the "root" need to release it
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mStyleContext->Release();
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}
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if (mSibling) {
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delete mSibling;
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}
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}
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nsresult
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Display(nsDisplayListBuilder* aBuilder,
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nsIFrame* aForFrame,
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const nsDisplayListSet& aLists,
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PRUint32 aIndex,
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const nsRect* aSelectedRect = nsnull);
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void PaintForeground(nsPresContext* aPresContext,
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nsRenderingContext& aRenderingContext,
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nsPoint aPt,
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bool aIsSelected);
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// This is the method called to ask the char to stretch itself.
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// @param aContainerSize - IN - suggested size for the stretched char
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// @param aDesiredStretchSize - OUT - the size that the char wants
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nsresult
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Stretch(nsPresContext* aPresContext,
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nsRenderingContext& aRenderingContext,
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nsStretchDirection aStretchDirection,
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const nsBoundingMetrics& aContainerSize,
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nsBoundingMetrics& aDesiredStretchSize,
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PRUint32 aStretchHint,
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bool aRTL);
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void
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SetData(nsPresContext* aPresContext,
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nsString& aData);
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void
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GetData(nsString& aData) {
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aData = mData;
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}
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PRInt32
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Length() {
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return mData.Length();
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}
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nsStretchDirection
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GetStretchDirection() {
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return mDirection;
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}
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// Sometimes we only want to pass the data to another routine,
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// this function helps to avoid copying
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const PRUnichar*
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get() {
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return mData.get();
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}
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void
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GetRect(nsRect& aRect) {
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aRect = mRect;
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}
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void
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SetRect(const nsRect& aRect) {
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mRect = aRect;
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// shift the orgins of child chars if any
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if (!mParent && mSibling) { // only a "root" having child chars can enter here
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for (nsMathMLChar* child = mSibling; child; child = child->mSibling) {
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nsRect rect;
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child->GetRect(rect);
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rect.MoveBy(mRect.x, mRect.y);
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child->SetRect(rect);
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}
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}
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}
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// Get the maximum width that the character might have after a vertical
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// Stretch().
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//
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// @param aStretchHint can be the value that will be passed to Stretch().
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// It is used to determine whether the operator is stretchy or a largeop.
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// @param aMaxSize is the value of the "maxsize" attribute.
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// @param aMaxSizeIsAbsolute indicates whether the aMaxSize is an absolute
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// value in app units (true) or a multiplier of the base size (false).
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nscoord
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GetMaxWidth(nsPresContext* aPresContext,
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nsRenderingContext& aRenderingContext,
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PRUint32 aStretchHint = NS_STRETCH_NORMAL,
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float aMaxSize = NS_MATHML_OPERATOR_SIZE_INFINITY,
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// Perhaps just nsOperatorFlags aFlags.
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// But need DisplayStyle for largeOp,
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// or remove the largeop bit from flags.
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bool aMaxSizeIsAbsolute = false);
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// Metrics that _exactly_ enclose the char. The char *must* have *already*
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// being stretched before you can call the GetBoundingMetrics() method.
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// IMPORTANT: since chars have their own style contexts, and may be rendered
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// with glyphs that are not in the parent font, just calling the default
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// aRenderingContext.GetBoundingMetrics(aChar) can give incorrect results.
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void
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GetBoundingMetrics(nsBoundingMetrics& aBoundingMetrics) {
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aBoundingMetrics = mBoundingMetrics;
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}
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void
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SetBoundingMetrics(nsBoundingMetrics& aBoundingMetrics) {
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mBoundingMetrics = aBoundingMetrics;
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}
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// Hooks to access the extra leaf style contexts given to the MathMLChars.
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// They provide an interface to make them accessible to the Style System via
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// the Get/Set AdditionalStyleContext() APIs. Owners of MathMLChars
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// should honor these APIs.
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nsStyleContext* GetStyleContext() const;
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void SetStyleContext(nsStyleContext* aStyleContext);
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protected:
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friend class nsGlyphTable;
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nsString mData;
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// support for handling composite stretchy chars like TeX over/under braces
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nsMathMLChar* mSibling;
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nsMathMLChar* mParent;
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private:
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nsRect mRect;
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nsStretchDirection mDirection;
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nsBoundingMetrics mBoundingMetrics;
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nsStyleContext* mStyleContext;
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nsGlyphTable* mGlyphTable;
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nsGlyphCode mGlyph;
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// mFamily is non-empty when the family for the current size is different
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// from the family in the nsStyleContext.
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nsString mFamily;
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// mUnscaledAscent is the actual ascent of the char.
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nscoord mUnscaledAscent;
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// mScaleX, mScaleY are the factors by which we scale the char.
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float mScaleX, mScaleY;
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// mDrawNormal indicates whether we use special glyphs or not.
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bool mDrawNormal;
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// mMirrored indicates whether the character is mirrored.
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bool mMirrored;
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class StretchEnumContext;
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friend class StretchEnumContext;
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// helper methods
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nsresult
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StretchInternal(nsPresContext* aPresContext,
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nsRenderingContext& aRenderingContext,
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nsStretchDirection& aStretchDirection,
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const nsBoundingMetrics& aContainerSize,
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nsBoundingMetrics& aDesiredStretchSize,
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PRUint32 aStretchHint,
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float aMaxSize = NS_MATHML_OPERATOR_SIZE_INFINITY,
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bool aMaxSizeIsAbsolute = false);
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nsresult
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ComposeChildren(nsPresContext* aPresContext,
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nsRenderingContext& aRenderingContext,
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nsGlyphTable* aGlyphTable,
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nscoord aTargetSize,
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nsBoundingMetrics& aCompositeSize,
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PRUint32 aStretchHint);
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nsresult
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PaintVertically(nsPresContext* aPresContext,
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nsRenderingContext& aRenderingContext,
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nsFont& aFont,
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nsStyleContext* aStyleContext,
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nsGlyphTable* aGlyphTable,
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nsRect& aRect);
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nsresult
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PaintHorizontally(nsPresContext* aPresContext,
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nsRenderingContext& aRenderingContext,
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nsFont& aFont,
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nsStyleContext* aStyleContext,
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nsGlyphTable* aGlyphTable,
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nsRect& aRect);
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void
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ApplyTransforms(nsRenderingContext& aRenderingContext, nsRect &r);
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};
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#endif /* nsMathMLChar_h___ */
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