forked from mirrors/gecko-dev
275 lines
8.7 KiB
C++
275 lines
8.7 KiB
C++
/* -*- Mode: C++; tab-width: 8; indent-tabs-mode: nil; c-basic-offset: 2 -*- */
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/* vim: set ts=8 sts=2 et sw=2 tw=80: */
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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 "nsColor.h"
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#include "nsMathMLOperators.h"
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#include "nsPoint.h"
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#include "nsRect.h"
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#include "nsString.h"
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#include "nsBoundingMetrics.h"
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#include "gfxTextRun.h"
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class gfxContext;
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class nsGlyphTable;
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class nsIFrame;
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class nsDisplayListBuilder;
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class nsDisplayListSet;
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class nsPresContext;
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struct nsBoundingMetrics;
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struct nsFont;
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namespace mozilla {
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class ComputedStyle;
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}
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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 either
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// 1) a 'code@font' pair from the mathfontFONTFAMILY.properties table. The
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// 'code' is interpreted as a Unicode point. The 'font' is a numeric
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// identifier given to the font to which the glyph belongs, which is 0 for the
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// FONTFAMILY and > 0 for 'external' fonts.
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// 2) a glyph index from the Open Type MATH table. In that case, all the glyphs
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// come from the font containing that table and 'font' is just set to -1.
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struct nsGlyphCode {
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union {
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char16_t code[2];
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uint32_t glyphID;
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};
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int8_t font;
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bool IsGlyphID() const { return font == -1; }
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int32_t Length() const {
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return (IsGlyphID() || code[1] == char16_t('\0') ? 1 : 2);
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}
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bool Exists() const
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{
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return IsGlyphID() ? glyphID != 0 : 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.font == font &&
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((IsGlyphID() && other.glyphID == glyphID) ||
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(!IsGlyphID() && other.code[0] == code[0] &&
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other.code[1] == code[1])));
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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
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// symbols).
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class nsMathMLChar
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{
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public:
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typedef gfxTextRun::Range Range;
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typedef mozilla::gfx::DrawTarget DrawTarget;
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// constructor and destructor
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nsMathMLChar()
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: mDirection(NS_STRETCH_DIRECTION_DEFAULT)
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{
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MOZ_COUNT_CTOR(nsMathMLChar);
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mComputedStyle = nullptr;
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mUnscaledAscent = 0;
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mScaleX = mScaleY = 1.0;
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mDraw = DRAW_NORMAL;
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mMirrored = false;
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}
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// not a virtual destructor: this class is not intended to be subclassed
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~nsMathMLChar();
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void Display(nsDisplayListBuilder* aBuilder,
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nsIFrame* aForFrame,
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const nsDisplayListSet& aLists,
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uint32_t aIndex,
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const nsRect* aSelectedRect = nullptr);
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void PaintForeground(nsIFrame* aForFrame,
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gfxContext& 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(nsIFrame* aForFrame,
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DrawTarget* aDrawTarget,
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float aFontSizeInflation,
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nsStretchDirection aStretchDirection,
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const nsBoundingMetrics& aContainerSize,
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nsBoundingMetrics& aDesiredStretchSize,
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uint32_t aStretchHint,
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bool aRTL);
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void
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SetData(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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int32_t
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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 char16_t*
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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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}
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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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nscoord
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GetMaxWidth(nsIFrame* aForFrame,
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DrawTarget* aDrawTarget,
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float aFontSizeInflation,
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uint32_t aStretchHint = NS_STRETCH_NORMAL);
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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 ComputedStyles, 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 ComputedStyles 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 AdditionalComputedStyle() APIs. Owners of MathMLChars
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// should honor these APIs.
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mozilla::ComputedStyle* GetComputedStyle() const;
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void SetComputedStyle(mozilla::ComputedStyle* aComputedStyle);
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protected:
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friend class nsGlyphTable;
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friend class nsPropertiesTable;
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friend class nsOpenTypeTable;
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nsString mData;
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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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RefPtr<mozilla::ComputedStyle> mComputedStyle;
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// mGlyphs/mBmData are arrays describing the glyphs used to draw the operator.
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// See the drawing methods below.
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RefPtr<gfxTextRun> mGlyphs[4];
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nsBoundingMetrics mBmData[4];
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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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// mDraw indicates how we draw the stretchy operator:
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// - DRAW_NORMAL: we render the mData string normally.
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// - DRAW_VARIANT: we draw a larger size variant given by mGlyphs[0].
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// - DRAW_PARTS: we assemble several parts given by mGlyphs[0], ... mGlyphs[4]
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// XXXfredw: the MATH table can have any numbers of parts and extenders.
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enum DrawingMethod {
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DRAW_NORMAL, DRAW_VARIANT, DRAW_PARTS
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};
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DrawingMethod mDraw;
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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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bool
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SetFontFamily(nsPresContext* aPresContext,
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const nsGlyphTable* aGlyphTable,
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const nsGlyphCode& aGlyphCode,
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const mozilla::FontFamilyList& aDefaultFamily,
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nsFont& aFont,
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RefPtr<gfxFontGroup>* aFontGroup);
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nsresult
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StretchInternal(nsIFrame* aForFrame,
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DrawTarget* aDrawTarget,
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float aFontSizeInflation,
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nsStretchDirection& aStretchDirection,
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const nsBoundingMetrics& aContainerSize,
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nsBoundingMetrics& aDesiredStretchSize,
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uint32_t 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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PaintVertically(nsPresContext* aPresContext,
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gfxContext* aThebesContext,
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nsRect& aRect,
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nscolor aColor);
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nsresult
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PaintHorizontally(nsPresContext* aPresContext,
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gfxContext* aThebesContext,
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nsRect& aRect,
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nscolor aColor);
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void
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ApplyTransforms(gfxContext* aThebesContext, int32_t aAppUnitsPerGfxUnit,
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nsRect &r);
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};
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#endif /* nsMathMLChar_h___ */
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