The Tor Browser: comparison layout/mathml/nsMathMLChar.h

--1:000000000000
+:39ebe623a489
+/* -*- 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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comparison: layout/mathml/nsMathMLChar.h

layout/mathml/nsMathMLChar.h