The Tor Browser: layout/mathml/nsMathMLChar.h@7e26c7da4463 (annotated)

layout/mathml/nsMathMLChar.h@7e26c7da4463 (annotated)

layout/mathml/nsMathMLChar.h

Wed, 31 Dec 2014 06:55:50 +0100

author: Michael Schloh von Bennewitz <michael@schloh.com>
date: Wed, 31 Dec 2014 06:55:50 +0100
changeset 2: 7e26c7da4463
permissions: -rw-r--r--

Added tag UPSTREAM_283F7C6 for changeset ca08bd8f51b2

 /* -*- Mode: C++; tab-width: 2; indent-tabs-mode: nil; c-basic-offset: 2 -*- */
 /* This Source Code Form is subject to the terms of the Mozilla Public
  * License, v. 2.0. If a copy of the MPL was not distributed with this
  * file, You can obtain one at http://mozilla.org/MPL/2.0/. */
 #ifndef nsMathMLChar_h___
 #define nsMathMLChar_h___
 #include "nsAutoPtr.h"
 #include "nsMathMLOperators.h"
 #include "nsPoint.h"
 #include "nsRect.h"
 #include "nsString.h"
 #include "nsBoundingMetrics.h"
 #include "gfxFont.h"
 class nsGlyphTable;
 class nsIFrame;
 class nsDisplayListBuilder;
 class nsDisplayListSet;
 class nsPresContext;
 class nsRenderingContext;
 class nsBoundingMetrics;
 class nsStyleContext;
 class nsFont;
 // Hints for Stretch() to indicate criteria for stretching
 enum {
   // Don't stretch
   NS_STRETCH_NONE     = 0x00,
   // Variable size stretches
   NS_STRETCH_VARIABLE_MASK = 0x0F,
   NS_STRETCH_NORMAL   = 0x01, // try to stretch to requested size
   NS_STRETCH_NEARER   = 0x02, // stretch very close to requested size
   NS_STRETCH_SMALLER  = 0x04, // don't stretch more than requested size
   NS_STRETCH_LARGER   = 0x08, // don't stretch less than requested size
   // A largeop in displaystyle
   NS_STRETCH_LARGEOP  = 0x10,
   NS_STRETCH_INTEGRAL  = 0x20,
   // Intended for internal use:
   // Find the widest metrics that might be returned from a vertical stretch
   NS_STRETCH_MAXWIDTH = 0x40
 };
 // A single glyph in our internal representation is either
 // 1) a 'code@font' pair from the mathfontFONTFAMILY.properties table. The
 // 'code' is interpreted as a Unicode point. The 'font' is a numeric
 // identifier given to the font to which the glyph belongs, which is 0 for the
 // FONTFAMILY and > 0 for 'external' fonts.
 // 2) a glyph index from the Open Type MATH table. In that case, all the glyphs
 // come from the font containing that table and 'font' is just set to -1.
 struct nsGlyphCode {
   union {
     char16_t code[2];
     uint32_t glyphID;
   };
   int8_t   font;
   bool IsGlyphID() const { return font == -1; }
   int32_t Length() const {
     return (IsGlyphID() || code[1] == PRUnichar('\0') ? 1 : 2);
   }
   bool Exists() const
   {
     return IsGlyphID() ? glyphID != 0 : code[0] != 0;
   }
   bool operator==(const nsGlyphCode& other) const
   {
     return (other.font == font &&
             ((IsGlyphID() && other.glyphID == glyphID) ||
              (!IsGlyphID() && other.code[0] == code[0] &&
               other.code[1] == code[1])));
   }
   bool operator!=(const nsGlyphCode& other) const
   {
     return ! operator==(other);
   }
 };
 // Class used to handle stretchy symbols (accent, delimiter and boundary
 // symbols).
 class nsMathMLChar
 {
 public:
   // constructor and destructor
   nsMathMLChar() {
     MOZ_COUNT_CTOR(nsMathMLChar);
     mStyleContext = nullptr;
     mUnscaledAscent = 0;
     mScaleX = mScaleY = 1.0;
     mDraw = DRAW_NORMAL;
     mMirrored = false;
   }
   // not a virtual destructor: this class is not intended to be subclassed
   ~nsMathMLChar();
   void Display(nsDisplayListBuilder*   aBuilder,
                nsIFrame*               aForFrame,
                const nsDisplayListSet& aLists,
                uint32_t                aIndex,
                const nsRect*           aSelectedRect = nullptr);
   void PaintForeground(nsPresContext* aPresContext,
                        nsRenderingContext& aRenderingContext,
                        nsPoint aPt,
                        bool aIsSelected);
   // This is the method called to ask the char to stretch itself.
   // @param aContainerSize - IN - suggested size for the stretched char
   // @param aDesiredStretchSize - OUT - the size that the char wants
   nsresult
   Stretch(nsPresContext*           aPresContext,
           nsRenderingContext&     aRenderingContext,
           nsStretchDirection       aStretchDirection,
           const nsBoundingMetrics& aContainerSize,
           nsBoundingMetrics&       aDesiredStretchSize,
           uint32_t                 aStretchHint,
           bool                     aRTL);
   void
   SetData(nsPresContext* aPresContext,
           nsString&       aData);
   void
   GetData(nsString& aData) {
     aData = mData;
   }
   int32_t
   Length() {
     return mData.Length();
   }
   nsStretchDirection
   GetStretchDirection() {
     return mDirection;
   }
   // Sometimes we only want to pass the data to another routine,
   // this function helps to avoid copying
   const char16_t*
   get() {
     return mData.get();
   }
   void
   GetRect(nsRect& aRect) {
     aRect = mRect;
   }
   void
   SetRect(const nsRect& aRect) {
     mRect = aRect;
   }
   // Get the maximum width that the character might have after a vertical
   // Stretch().
   //
   // @param aStretchHint can be the value that will be passed to Stretch().
   // It is used to determine whether the operator is stretchy or a largeop.
   // @param aMaxSize is the value of the "maxsize" attribute.
   // @param aMaxSizeIsAbsolute indicates whether the aMaxSize is an absolute
   // value in app units (true) or a multiplier of the base size (false).
   nscoord
   GetMaxWidth(nsPresContext* aPresContext,
               nsRenderingContext& aRenderingContext,
               uint32_t aStretchHint = NS_STRETCH_NORMAL,
               float aMaxSize = NS_MATHML_OPERATOR_SIZE_INFINITY,
               // Perhaps just nsOperatorFlags aFlags.
               // But need DisplayStyle for largeOp,
               // or remove the largeop bit from flags.
               bool aMaxSizeIsAbsolute = false);
   // Metrics that _exactly_ enclose the char. The char *must* have *already*
   // being stretched before you can call the GetBoundingMetrics() method.
   // IMPORTANT: since chars have their own style contexts, and may be rendered
   // with glyphs that are not in the parent font, just calling the default
   // aRenderingContext.GetBoundingMetrics(aChar) can give incorrect results.
   void
   GetBoundingMetrics(nsBoundingMetrics& aBoundingMetrics) {
     aBoundingMetrics = mBoundingMetrics;
   }
   void
   SetBoundingMetrics(nsBoundingMetrics& aBoundingMetrics) {
     mBoundingMetrics = aBoundingMetrics;
   }
   // Hooks to access the extra leaf style contexts given to the MathMLChars.
   // They provide an interface to make them accessible to the Style System via
   // the Get/Set AdditionalStyleContext() APIs. Owners of MathMLChars
   // should honor these APIs.
   nsStyleContext* GetStyleContext() const;
   void SetStyleContext(nsStyleContext* aStyleContext);
 protected:
   friend class nsGlyphTable;
   friend class nsPropertiesTable;
   friend class nsOpenTypeTable;
   nsString           mData;
 private:
   nsRect             mRect;
   nsStretchDirection mDirection;
   nsBoundingMetrics  mBoundingMetrics;
   nsStyleContext*    mStyleContext;
   // mGlyphs/mBmData are arrays describing the glyphs used to draw the operator.
   // See the drawing methods below.
   nsAutoPtr<gfxTextRun> mGlyphs[4];
   nsBoundingMetrics     mBmData[4];
   // mUnscaledAscent is the actual ascent of the char.
   nscoord            mUnscaledAscent;
   // mScaleX, mScaleY are the factors by which we scale the char.
   float              mScaleX, mScaleY;
   // mDraw indicates how we draw the stretchy operator:
   // - DRAW_NORMAL: we render the mData string normally.
   // - DRAW_VARIANT: we draw a larger size variant given by mGlyphs[0].
   // - DRAW_PARTS: we assemble several parts given by mGlyphs[0], ... mGlyphs[4]
   // XXXfredw: the MATH table can have any numbers of parts and extenders.
   enum DrawingMethod {
     DRAW_NORMAL, DRAW_VARIANT, DRAW_PARTS
   };
   DrawingMethod mDraw;
   // mMirrored indicates whether the character is mirrored.
   bool               mMirrored;
   class StretchEnumContext;
   friend class StretchEnumContext;
   // helper methods
   bool
   SetFontFamily(nsPresContext*          aPresContext,
                 const nsGlyphTable*     aGlyphTable,
                 const nsGlyphCode&      aGlyphCode,
                 const nsAString&        aDefaultFamily,
                 nsFont&                 aFont,
                 nsRefPtr<gfxFontGroup>* aFontGroup);
   nsresult
   StretchInternal(nsPresContext*           aPresContext,
                   gfxContext*              aThebesContext,
                   nsStretchDirection&      aStretchDirection,
                   const nsBoundingMetrics& aContainerSize,
                   nsBoundingMetrics&       aDesiredStretchSize,
                   uint32_t                 aStretchHint,
                   float           aMaxSize = NS_MATHML_OPERATOR_SIZE_INFINITY,
                   bool            aMaxSizeIsAbsolute = false);
   nsresult
   PaintVertically(nsPresContext* aPresContext,
                   gfxContext*    aThebesContext,
                   nsRect&        aRect);
   nsresult
   PaintHorizontally(nsPresContext* aPresContext,
                     gfxContext*    aThebesContext,
                     nsRect&        aRect);
   void
   ApplyTransforms(gfxContext* aThebesContext, int32_t aAppUnitsPerGfxUnit,
                   nsRect &r);
 };
 #endif /* nsMathMLChar_h___ */

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layout/mathml/nsMathMLChar.h@7e26c7da4463 (annotated)

layout/mathml/nsMathMLChar.h