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+/* -*- Mode: C++; tab-width: 8; indent-tabs-mode: nil; c-basic-offset: 2 -*- */
+/* vim: set ts=8 sts=2 et sw=2 tw=80: */
+/* 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 "nsColor.h"
+#include "nsMathMLOperators.h"
+#include "nsPoint.h"
+#include "nsRect.h"
+#include "nsString.h"
+#include "nsBoundingMetrics.h"
+#include "gfxTextRun.h"
+
+class gfxContext;
+class nsGlyphTable;
+class nsIFrame;
+class nsPresContext;
+struct nsBoundingMetrics;
+struct nsFont;
+
+namespace mozilla {
+class nsDisplayListBuilder;
+class nsDisplayListSet;
+class ComputedStyle;
+} // namespace mozilla
+
+// 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,
+
+ // Intended for internal use:
+ // Find the widest metrics that might be returned from a vertical stretch
+ NS_STRETCH_MAXWIDTH = 0x20
+};
+
+// 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] == char16_t('\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:
+ typedef gfxTextRun::Range Range;
+ typedef mozilla::gfx::DrawTarget DrawTarget;
+
+ // constructor and destructor
+ nsMathMLChar() : mDirection(NS_STRETCH_DIRECTION_DEFAULT) {
+ MOZ_COUNT_CTOR(nsMathMLChar);
+ mComputedStyle = 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(mozilla::nsDisplayListBuilder* aBuilder, nsIFrame* aForFrame,
+ const mozilla::nsDisplayListSet& aLists, uint32_t aIndex,
+ const nsRect* aSelectedRect = nullptr);
+
+ void PaintForeground(nsIFrame* aForFrame, gfxContext& 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(nsIFrame* aForFrame, DrawTarget* aDrawTarget,
+ float aFontSizeInflation,
+ nsStretchDirection aStretchDirection,
+ const nsBoundingMetrics& aContainerSize,
+ nsBoundingMetrics& aDesiredStretchSize,
+ uint32_t aStretchHint, bool aRTL);
+
+ void SetData(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.
+ nscoord GetMaxWidth(nsIFrame* aForFrame, DrawTarget* aDrawTarget,
+ float aFontSizeInflation,
+ uint32_t aStretchHint = NS_STRETCH_NORMAL);
+
+ // 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 ComputedStyles, 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 ComputedStyles given to the MathMLChars.
+ // They provide an interface to make them accessible to the Style System via
+ // the Get/Set AdditionalComputedStyle() APIs. Owners of MathMLChars
+ // should honor these APIs.
+ mozilla::ComputedStyle* GetComputedStyle() const;
+
+ void SetComputedStyle(mozilla::ComputedStyle* aComputedStyle);
+
+ protected:
+ friend class nsGlyphTable;
+ friend class nsPropertiesTable;
+ friend class nsOpenTypeTable;
+ nsString mData;
+
+ private:
+ nsRect mRect;
+ nsStretchDirection mDirection;
+ nsBoundingMetrics mBoundingMetrics;
+ RefPtr<mozilla::ComputedStyle> mComputedStyle;
+ // mGlyphs/mBmData are arrays describing the glyphs used to draw the operator.
+ // See the drawing methods below.
+ RefPtr<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 mozilla::StyleFontFamilyList& aDefaultFamily,
+ nsFont& aFont, RefPtr<gfxFontGroup>* aFontGroup);
+
+ nsresult StretchInternal(nsIFrame* aForFrame, DrawTarget* aDrawTarget,
+ float aFontSizeInflation,
+ 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,
+ nscolor aColor);
+
+ nsresult PaintHorizontally(nsPresContext* aPresContext,
+ gfxContext* aThebesContext, nsRect& aRect,
+ nscolor aColor);
+
+ void ApplyTransforms(gfxContext* aThebesContext, int32_t aAppUnitsPerGfxUnit,
+ nsRect& r);
+};
+
+#endif /* nsMathMLChar_h___ */