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65205f109b
This patch implements a derived class of gfxPlatformFontList and a set of associated objects that uses fontconfig. It's a replacement for the existing gfxPangoFontGroup and gfxFontconfigUtils code. The fontconfig API is used to lookup all fonts on the system, which are grouped by family name. Changes due to this patch: - font style matching, the mapping of style attributes to a specific font, is now handled by the same Gecko code that is used on other plaforms. fontconfig substitutions are handled but fontconfig style matching no longer used. - downloadable fonts using unicode-range are now supported - local fullname lookups are only done with the English name of the font, as per the CSS3 Fonts spec, and not only other localized fullnames - size-specific bitmap fonts are no longer supported - fonts lacking a Unicode character map are no longer supported
1188 lines
49 KiB
C++
1188 lines
49 KiB
C++
/* -*- Mode: C++; tab-width: 20; indent-tabs-mode: nil; c-basic-offset: 4 -*-
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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 GFX_TEXTRUN_H
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#define GFX_TEXTRUN_H
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#include "gfxTypes.h"
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#include "nsString.h"
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#include "gfxPoint.h"
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#include "gfxFont.h"
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#include "nsTArray.h"
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#include "gfxSkipChars.h"
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#include "gfxPlatform.h"
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#include "mozilla/MemoryReporting.h"
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#include "DrawMode.h"
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#include "harfbuzz/hb.h"
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#include "nsUnicodeScriptCodes.h"
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#ifdef DEBUG
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#include <stdio.h>
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#endif
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class gfxContext;
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class gfxFontGroup;
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class gfxUserFontEntry;
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class gfxUserFontSet;
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class gfxTextContextPaint;
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class nsIAtom;
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class nsILanguageAtomService;
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class gfxMissingFontRecorder;
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/**
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* Callback for Draw() to use when drawing text with mode
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* DrawMode::GLYPH_PATH.
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*/
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struct gfxTextRunDrawCallbacks {
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/**
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* Constructs a new DrawCallbacks object.
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*
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* @param aShouldPaintSVGGlyphs If true, SVG glyphs will be painted. If
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* false, SVG glyphs will not be painted; fallback plain glyphs are not
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* emitted either.
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*/
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explicit gfxTextRunDrawCallbacks(bool aShouldPaintSVGGlyphs = false)
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: mShouldPaintSVGGlyphs(aShouldPaintSVGGlyphs)
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{
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}
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/**
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* Called when a path has been emitted to the gfxContext when
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* painting a text run. This can be called any number of times,
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* due to partial ligatures and intervening SVG glyphs.
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*/
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virtual void NotifyGlyphPathEmitted() = 0;
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bool mShouldPaintSVGGlyphs;
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};
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/**
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* gfxTextRun is an abstraction for drawing and measuring substrings of a run
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* of text. It stores runs of positioned glyph data, each run having a single
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* gfxFont. The glyphs are associated with a string of source text, and the
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* gfxTextRun APIs take parameters that are offsets into that source text.
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*
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* gfxTextRuns are not refcounted. They should be deleted when no longer required.
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*
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* gfxTextRuns are mostly immutable. The only things that can change are
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* inter-cluster spacing and line break placement. Spacing is always obtained
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* lazily by methods that need it, it is not cached. Line breaks are stored
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* persistently (insofar as they affect the shaping of glyphs; gfxTextRun does
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* not actually do anything to explicitly account for line breaks). Initially
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* there are no line breaks. The textrun can record line breaks before or after
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* any given cluster. (Line breaks specified inside clusters are ignored.)
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*
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* It is important that zero-length substrings are handled correctly. This will
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* be on the test!
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*/
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class gfxTextRun : public gfxShapedText {
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public:
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// Override operator delete to properly free the object that was
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// allocated via malloc.
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void operator delete(void* p) {
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free(p);
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}
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virtual ~gfxTextRun();
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typedef gfxFont::RunMetrics Metrics;
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// Public textrun API for general use
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bool IsClusterStart(uint32_t aPos) const {
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NS_ASSERTION(aPos < GetLength(), "aPos out of range");
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return mCharacterGlyphs[aPos].IsClusterStart();
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}
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bool IsLigatureGroupStart(uint32_t aPos) const {
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NS_ASSERTION(aPos < GetLength(), "aPos out of range");
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return mCharacterGlyphs[aPos].IsLigatureGroupStart();
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}
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bool CanBreakLineBefore(uint32_t aPos) const {
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return CanBreakBefore(aPos) == CompressedGlyph::FLAG_BREAK_TYPE_NORMAL;
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}
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bool CanHyphenateBefore(uint32_t aPos) const {
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return CanBreakBefore(aPos) == CompressedGlyph::FLAG_BREAK_TYPE_HYPHEN;
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}
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// Returns a gfxShapedText::CompressedGlyph::FLAG_BREAK_TYPE_* value
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// as defined in gfxFont.h (may be NONE, NORMAL or HYPHEN).
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uint8_t CanBreakBefore(uint32_t aPos) const {
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NS_ASSERTION(aPos < GetLength(), "aPos out of range");
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return mCharacterGlyphs[aPos].CanBreakBefore();
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}
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bool CharIsSpace(uint32_t aPos) const {
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NS_ASSERTION(aPos < GetLength(), "aPos out of range");
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return mCharacterGlyphs[aPos].CharIsSpace();
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}
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bool CharIsTab(uint32_t aPos) const {
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NS_ASSERTION(aPos < GetLength(), "aPos out of range");
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return mCharacterGlyphs[aPos].CharIsTab();
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}
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bool CharIsNewline(uint32_t aPos) const {
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NS_ASSERTION(aPos < GetLength(), "aPos out of range");
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return mCharacterGlyphs[aPos].CharIsNewline();
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}
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bool CharIsLowSurrogate(uint32_t aPos) const {
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NS_ASSERTION(aPos < GetLength(), "aPos out of range");
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return mCharacterGlyphs[aPos].CharIsLowSurrogate();
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}
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// All uint32_t aStart, uint32_t aLength ranges below are restricted to
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// grapheme cluster boundaries! All offsets are in terms of the string
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// passed into MakeTextRun.
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// All coordinates are in layout/app units
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/**
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* Set the potential linebreaks for a substring of the textrun. These are
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* the "allow break before" points. Initially, there are no potential
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* linebreaks.
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*
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* This can change glyphs and/or geometry! Some textruns' shapes
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* depend on potential line breaks (e.g., title-case-converting textruns).
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* This function is virtual so that those textruns can reshape themselves.
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*
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* @return true if this changed the linebreaks, false if the new line
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* breaks are the same as the old
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*/
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virtual bool SetPotentialLineBreaks(uint32_t aStart, uint32_t aLength,
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uint8_t *aBreakBefore,
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gfxContext *aRefContext);
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/**
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* Layout provides PropertyProvider objects. These allow detection of
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* potential line break points and computation of spacing. We pass the data
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* this way to allow lazy data acquisition; for example BreakAndMeasureText
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* will want to only ask for properties of text it's actually looking at.
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*
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* NOTE that requested spacing may not actually be applied, if the textrun
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* is unable to apply it in some context. Exception: spacing around a
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* whitespace character MUST always be applied.
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*/
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class PropertyProvider {
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public:
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// Detect hyphenation break opportunities in the given range; breaks
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// not at cluster boundaries will be ignored.
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virtual void GetHyphenationBreaks(uint32_t aStart, uint32_t aLength,
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bool *aBreakBefore) = 0;
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// Returns the provider's hyphenation setting, so callers can decide
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// whether it is necessary to call GetHyphenationBreaks.
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// Result is an NS_STYLE_HYPHENS_* value.
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virtual int8_t GetHyphensOption() = 0;
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// Returns the extra width that will be consumed by a hyphen. This should
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// be constant for a given textrun.
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virtual gfxFloat GetHyphenWidth() = 0;
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typedef gfxFont::Spacing Spacing;
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/**
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* Get the spacing around the indicated characters. Spacing must be zero
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* inside clusters. In other words, if character i is not
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* CLUSTER_START, then character i-1 must have zero after-spacing and
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* character i must have zero before-spacing.
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*/
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virtual void GetSpacing(uint32_t aStart, uint32_t aLength,
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Spacing *aSpacing) = 0;
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// Returns a gfxContext that can be used to measure the hyphen glyph.
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// Only called if the hyphen width is requested.
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virtual already_AddRefed<gfxContext> GetContext() = 0;
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// Return the appUnitsPerDevUnit value to be used when measuring.
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// Only called if the hyphen width is requested.
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virtual uint32_t GetAppUnitsPerDevUnit() = 0;
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};
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class ClusterIterator {
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public:
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explicit ClusterIterator(gfxTextRun *aTextRun);
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void Reset();
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bool NextCluster();
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uint32_t Position() const {
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return mCurrentChar;
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}
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uint32_t ClusterLength() const;
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gfxFloat ClusterAdvance(PropertyProvider *aProvider) const;
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private:
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gfxTextRun *mTextRun;
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uint32_t mCurrentChar;
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};
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/**
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* Draws a substring. Uses only GetSpacing from aBreakProvider.
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* The provided point is the baseline origin on the left of the string
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* for LTR, on the right of the string for RTL.
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* @param aAdvanceWidth if non-null, the advance width of the substring
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* is returned here.
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*
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* Drawing should respect advance widths in the sense that for LTR runs,
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* Draw(ctx, pt, offset1, length1, dirty, &provider, &advance) followed by
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* Draw(ctx, gfxPoint(pt.x + advance, pt.y), offset1 + length1, length2,
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* dirty, &provider, nullptr) should have the same effect as
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* Draw(ctx, pt, offset1, length1+length2, dirty, &provider, nullptr).
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* For RTL runs the rule is:
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* Draw(ctx, pt, offset1 + length1, length2, dirty, &provider, &advance) followed by
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* Draw(ctx, gfxPoint(pt.x + advance, pt.y), offset1, length1,
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* dirty, &provider, nullptr) should have the same effect as
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* Draw(ctx, pt, offset1, length1+length2, dirty, &provider, nullptr).
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*
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* Glyphs should be drawn in logical content order, which can be significant
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* if they overlap (perhaps due to negative spacing).
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*/
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void Draw(gfxContext *aContext, gfxPoint aPt,
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DrawMode aDrawMode,
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uint32_t aStart, uint32_t aLength,
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PropertyProvider *aProvider,
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gfxFloat *aAdvanceWidth, gfxTextContextPaint *aContextPaint,
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gfxTextRunDrawCallbacks *aCallbacks = nullptr);
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/**
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* Computes the ReflowMetrics for a substring.
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* Uses GetSpacing from aBreakProvider.
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* @param aBoundingBoxType which kind of bounding box (loose/tight)
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*/
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Metrics MeasureText(uint32_t aStart, uint32_t aLength,
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gfxFont::BoundingBoxType aBoundingBoxType,
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gfxContext *aRefContextForTightBoundingBox,
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PropertyProvider *aProvider);
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/**
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* Computes just the advance width for a substring.
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* Uses GetSpacing from aBreakProvider.
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* If aSpacing is not null, the spacing attached before and after
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* the substring would be returned in it. NOTE: the spacing is
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* included in the advance width.
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*/
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gfxFloat GetAdvanceWidth(uint32_t aStart, uint32_t aLength,
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PropertyProvider *aProvider,
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PropertyProvider::Spacing* aSpacing = nullptr);
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/**
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* Clear all stored line breaks for the given range (both before and after),
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* and then set the line-break state before aStart to aBreakBefore and
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* after the last cluster to aBreakAfter.
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*
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* We require that before and after line breaks be consistent. For clusters
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* i and i+1, we require that if there is a break after cluster i, a break
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* will be specified before cluster i+1. This may be temporarily violated
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* (e.g. after reflowing line L and before reflowing line L+1); to handle
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* these temporary violations, we say that there is a break betwen i and i+1
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* if a break is specified after i OR a break is specified before i+1.
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*
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* This can change textrun geometry! The existence of a linebreak can affect
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* the advance width of the cluster before the break (when kerning) or the
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* geometry of one cluster before the break or any number of clusters
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* after the break. (The one-cluster-before-the-break limit is somewhat
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* arbitrary; if some scripts require breaking it, then we need to
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* alter nsTextFrame::TrimTrailingWhitespace, perhaps drastically becase
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* it could affect the layout of frames before it...)
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*
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* We return true if glyphs or geometry changed, false otherwise. This
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* function is virtual so that gfxTextRun subclasses can reshape
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* properly.
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*
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* @param aAdvanceWidthDelta if non-null, returns the change in advance
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* width of the given range.
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*/
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virtual bool SetLineBreaks(uint32_t aStart, uint32_t aLength,
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bool aLineBreakBefore, bool aLineBreakAfter,
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gfxFloat *aAdvanceWidthDelta,
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gfxContext *aRefContext);
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enum SuppressBreak {
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eNoSuppressBreak,
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// Measure the range of text as if there is no break before it.
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eSuppressInitialBreak,
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// Measure the range of text as if it contains no break
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eSuppressAllBreaks
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};
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/**
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* Finds the longest substring that will fit into the given width.
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* Uses GetHyphenationBreaks and GetSpacing from aBreakProvider.
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* Guarantees the following:
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* -- 0 <= result <= aMaxLength
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* -- result is the maximal value of N such that either
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* N < aMaxLength && line break at N && GetAdvanceWidth(aStart, N) <= aWidth
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* OR N < aMaxLength && hyphen break at N && GetAdvanceWidth(aStart, N) + GetHyphenWidth() <= aWidth
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* OR N == aMaxLength && GetAdvanceWidth(aStart, N) <= aWidth
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* where GetAdvanceWidth assumes the effect of
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* SetLineBreaks(aStart, N, aLineBreakBefore, N < aMaxLength, aProvider)
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* -- if no such N exists, then result is the smallest N such that
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* N < aMaxLength && line break at N
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* OR N < aMaxLength && hyphen break at N
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* OR N == aMaxLength
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*
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* The call has the effect of
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* SetLineBreaks(aStart, result, aLineBreakBefore, result < aMaxLength, aProvider)
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* and the returned metrics and the invariants above reflect this.
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*
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* @param aMaxLength this can be UINT32_MAX, in which case the length used
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* is up to the end of the string
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* @param aLineBreakBefore set to true if and only if there is an actual
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* line break at the start of this string.
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* @param aSuppressBreak what break should be suppressed.
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* @param aTrimWhitespace if non-null, then we allow a trailing run of
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* spaces to be trimmed; the width of the space(s) will not be included in
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* the measured string width for comparison with the limit aWidth, and
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* trimmed spaces will not be included in returned metrics. The width
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* of the trimmed spaces will be returned in aTrimWhitespace.
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* Trimmed spaces are still counted in the "characters fit" result.
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* @param aMetrics if non-null, we fill this in for the returned substring.
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* If a hyphenation break was used, the hyphen is NOT included in the returned metrics.
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* @param aBoundingBoxType whether to make the bounding box in aMetrics tight
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* @param aRefContextForTightBoundingBox a reference context to get the
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* tight bounding box, if requested
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* @param aUsedHyphenation if non-null, records if we selected a hyphenation break
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* @param aLastBreak if non-null and result is aMaxLength, we set this to
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* the maximal N such that
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* N < aMaxLength && line break at N && GetAdvanceWidth(aStart, N) <= aWidth
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* OR N < aMaxLength && hyphen break at N && GetAdvanceWidth(aStart, N) + GetHyphenWidth() <= aWidth
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* or UINT32_MAX if no such N exists, where GetAdvanceWidth assumes
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* the effect of
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* SetLineBreaks(aStart, N, aLineBreakBefore, N < aMaxLength, aProvider)
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*
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* @param aCanWordWrap true if we can break between any two grapheme
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* clusters. This is set by word-wrap: break-word
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*
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* @param aBreakPriority in/out the priority of the break opportunity
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* saved in the line. If we are prioritizing break opportunities, we will
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* not set a break with a lower priority. @see gfxBreakPriority.
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*
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* Note that negative advance widths are possible especially if negative
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* spacing is provided.
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*/
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uint32_t BreakAndMeasureText(uint32_t aStart, uint32_t aMaxLength,
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bool aLineBreakBefore, gfxFloat aWidth,
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PropertyProvider *aProvider,
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SuppressBreak aSuppressBreak,
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gfxFloat *aTrimWhitespace,
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Metrics *aMetrics,
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gfxFont::BoundingBoxType aBoundingBoxType,
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gfxContext *aRefContextForTightBoundingBox,
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bool *aUsedHyphenation,
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uint32_t *aLastBreak,
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bool aCanWordWrap,
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gfxBreakPriority *aBreakPriority);
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/**
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* Update the reference context.
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* XXX this is a hack. New text frame does not call this. Use only
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* temporarily for old text frame.
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*/
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void SetContext(gfxContext *aContext) {}
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// Utility getters
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void *GetUserData() const { return mUserData; }
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void SetUserData(void *aUserData) { mUserData = aUserData; }
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void SetFlagBits(uint32_t aFlags) {
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NS_ASSERTION(!(aFlags & ~gfxTextRunFactory::SETTABLE_FLAGS),
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"Only user flags should be mutable");
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mFlags |= aFlags;
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}
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void ClearFlagBits(uint32_t aFlags) {
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NS_ASSERTION(!(aFlags & ~gfxTextRunFactory::SETTABLE_FLAGS),
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"Only user flags should be mutable");
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mFlags &= ~aFlags;
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}
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const gfxSkipChars& GetSkipChars() const { return mSkipChars; }
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gfxFontGroup *GetFontGroup() const { return mFontGroup; }
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// Call this, don't call "new gfxTextRun" directly. This does custom
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// allocation and initialization
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static gfxTextRun *Create(const gfxTextRunFactory::Parameters *aParams,
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uint32_t aLength, gfxFontGroup *aFontGroup,
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uint32_t aFlags);
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// The text is divided into GlyphRuns as necessary
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struct GlyphRun {
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nsRefPtr<gfxFont> mFont; // never null
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uint32_t mCharacterOffset; // into original UTF16 string
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uint8_t mMatchType;
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uint16_t mOrientation; // gfxTextRunFactory::TEXT_ORIENT_* value
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};
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class GlyphRunIterator {
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public:
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GlyphRunIterator(gfxTextRun *aTextRun, uint32_t aStart, uint32_t aLength)
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: mTextRun(aTextRun), mStartOffset(aStart), mEndOffset(aStart + aLength) {
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mNextIndex = mTextRun->FindFirstGlyphRunContaining(aStart);
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}
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bool NextRun();
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GlyphRun *GetGlyphRun() { return mGlyphRun; }
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uint32_t GetStringStart() { return mStringStart; }
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uint32_t GetStringEnd() { return mStringEnd; }
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private:
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gfxTextRun *mTextRun;
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GlyphRun *mGlyphRun;
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uint32_t mStringStart;
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uint32_t mStringEnd;
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uint32_t mNextIndex;
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uint32_t mStartOffset;
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uint32_t mEndOffset;
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};
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class GlyphRunOffsetComparator {
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public:
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bool Equals(const GlyphRun& a,
|
|
const GlyphRun& b) const
|
|
{
|
|
return a.mCharacterOffset == b.mCharacterOffset;
|
|
}
|
|
|
|
bool LessThan(const GlyphRun& a,
|
|
const GlyphRun& b) const
|
|
{
|
|
return a.mCharacterOffset < b.mCharacterOffset;
|
|
}
|
|
};
|
|
|
|
friend class GlyphRunIterator;
|
|
friend class FontSelector;
|
|
|
|
// API for setting up the textrun glyphs. Should only be called by
|
|
// things that construct textruns.
|
|
/**
|
|
* We've found a run of text that should use a particular font. Call this
|
|
* only during initialization when font substitution has been computed.
|
|
* Call it before setting up the glyphs for the characters in this run;
|
|
* SetMissingGlyph requires that the correct glyphrun be installed.
|
|
*
|
|
* If aForceNewRun, a new glyph run will be added, even if the
|
|
* previously added run uses the same font. If glyph runs are
|
|
* added out of strictly increasing aStartCharIndex order (via
|
|
* force), then SortGlyphRuns must be called after all glyph runs
|
|
* are added before any further operations are performed with this
|
|
* TextRun.
|
|
*/
|
|
nsresult AddGlyphRun(gfxFont *aFont, uint8_t aMatchType,
|
|
uint32_t aStartCharIndex, bool aForceNewRun,
|
|
uint16_t aOrientation);
|
|
void ResetGlyphRuns() { mGlyphRuns.Clear(); }
|
|
void SortGlyphRuns();
|
|
void SanitizeGlyphRuns();
|
|
|
|
CompressedGlyph* GetCharacterGlyphs() {
|
|
NS_ASSERTION(mCharacterGlyphs, "failed to initialize mCharacterGlyphs");
|
|
return mCharacterGlyphs;
|
|
}
|
|
|
|
// clean out results from shaping in progress, used for fallback scenarios
|
|
void ClearGlyphsAndCharacters();
|
|
|
|
void SetSpaceGlyph(gfxFont *aFont, gfxContext *aContext, uint32_t aCharIndex,
|
|
uint16_t aOrientation);
|
|
|
|
// Set the glyph data for the given character index to the font's
|
|
// space glyph, IF this can be done as a "simple" glyph record
|
|
// (not requiring a DetailedGlyph entry). This avoids the need to call
|
|
// the font shaper and go through the shaped-word cache for most spaces.
|
|
//
|
|
// The parameter aSpaceChar is the original character code for which
|
|
// this space glyph is being used; if this is U+0020, we need to record
|
|
// that it could be trimmed at a run edge, whereas other kinds of space
|
|
// (currently just U+00A0) would not be trimmable/breakable.
|
|
//
|
|
// Returns true if it was able to set simple glyph data for the space;
|
|
// if it returns false, the caller needs to fall back to some other
|
|
// means to create the necessary (detailed) glyph data.
|
|
bool SetSpaceGlyphIfSimple(gfxFont *aFont, gfxContext *aContext,
|
|
uint32_t aCharIndex, char16_t aSpaceChar,
|
|
uint16_t aOrientation);
|
|
|
|
// Record the positions of specific characters that layout may need to
|
|
// detect in the textrun, even though it doesn't have an explicit copy
|
|
// of the original text. These are recorded using flag bits in the
|
|
// CompressedGlyph record; if necessary, we convert "simple" glyph records
|
|
// to "complex" ones as the Tab and Newline flags are not present in
|
|
// simple CompressedGlyph records.
|
|
void SetIsTab(uint32_t aIndex) {
|
|
CompressedGlyph *g = &mCharacterGlyphs[aIndex];
|
|
if (g->IsSimpleGlyph()) {
|
|
DetailedGlyph *details = AllocateDetailedGlyphs(aIndex, 1);
|
|
details->mGlyphID = g->GetSimpleGlyph();
|
|
details->mAdvance = g->GetSimpleAdvance();
|
|
details->mXOffset = details->mYOffset = 0;
|
|
SetGlyphs(aIndex, CompressedGlyph().SetComplex(true, true, 1), details);
|
|
}
|
|
g->SetIsTab();
|
|
}
|
|
void SetIsNewline(uint32_t aIndex) {
|
|
CompressedGlyph *g = &mCharacterGlyphs[aIndex];
|
|
if (g->IsSimpleGlyph()) {
|
|
DetailedGlyph *details = AllocateDetailedGlyphs(aIndex, 1);
|
|
details->mGlyphID = g->GetSimpleGlyph();
|
|
details->mAdvance = g->GetSimpleAdvance();
|
|
details->mXOffset = details->mYOffset = 0;
|
|
SetGlyphs(aIndex, CompressedGlyph().SetComplex(true, true, 1), details);
|
|
}
|
|
g->SetIsNewline();
|
|
}
|
|
void SetIsLowSurrogate(uint32_t aIndex) {
|
|
SetGlyphs(aIndex, CompressedGlyph().SetComplex(false, false, 0), nullptr);
|
|
mCharacterGlyphs[aIndex].SetIsLowSurrogate();
|
|
}
|
|
|
|
/**
|
|
* Prefetch all the glyph extents needed to ensure that Measure calls
|
|
* on this textrun not requesting tight boundingBoxes will succeed. Note
|
|
* that some glyph extents might not be fetched due to OOM or other
|
|
* errors.
|
|
*/
|
|
void FetchGlyphExtents(gfxContext *aRefContext);
|
|
|
|
uint32_t CountMissingGlyphs();
|
|
const GlyphRun *GetGlyphRuns(uint32_t *aNumGlyphRuns) {
|
|
*aNumGlyphRuns = mGlyphRuns.Length();
|
|
return mGlyphRuns.Elements();
|
|
}
|
|
// Returns the index of the GlyphRun containing the given offset.
|
|
// Returns mGlyphRuns.Length() when aOffset is mCharacterCount.
|
|
uint32_t FindFirstGlyphRunContaining(uint32_t aOffset);
|
|
|
|
// Copy glyph data from a ShapedWord into this textrun.
|
|
void CopyGlyphDataFrom(gfxShapedWord *aSource, uint32_t aStart);
|
|
|
|
// Copy glyph data for a range of characters from aSource to this
|
|
// textrun.
|
|
void CopyGlyphDataFrom(gfxTextRun *aSource, uint32_t aStart,
|
|
uint32_t aLength, uint32_t aDest);
|
|
|
|
nsExpirationState *GetExpirationState() { return &mExpirationState; }
|
|
|
|
// Tell the textrun to release its reference to its creating gfxFontGroup
|
|
// immediately, rather than on destruction. This is used for textruns
|
|
// that are actually owned by a gfxFontGroup, so that they don't keep it
|
|
// permanently alive due to a circular reference. (The caller of this is
|
|
// taking responsibility for ensuring the textrun will not outlive its
|
|
// mFontGroup.)
|
|
void ReleaseFontGroup();
|
|
|
|
struct LigatureData {
|
|
// textrun offsets of the start and end of the containing ligature
|
|
uint32_t mLigatureStart;
|
|
uint32_t mLigatureEnd;
|
|
// appunits advance to the start of the ligature part within the ligature;
|
|
// never includes any spacing
|
|
gfxFloat mPartAdvance;
|
|
// appunits width of the ligature part; includes before-spacing
|
|
// when the part is at the start of the ligature, and after-spacing
|
|
// when the part is as the end of the ligature
|
|
gfxFloat mPartWidth;
|
|
|
|
bool mClipBeforePart;
|
|
bool mClipAfterPart;
|
|
};
|
|
|
|
// return storage used by this run, for memory reporter;
|
|
// nsTransformedTextRun needs to override this as it holds additional data
|
|
virtual size_t SizeOfExcludingThis(mozilla::MallocSizeOf aMallocSizeOf)
|
|
MOZ_MUST_OVERRIDE;
|
|
virtual size_t SizeOfIncludingThis(mozilla::MallocSizeOf aMallocSizeOf)
|
|
MOZ_MUST_OVERRIDE;
|
|
|
|
// Get the size, if it hasn't already been gotten, marking as it goes.
|
|
size_t MaybeSizeOfIncludingThis(mozilla::MallocSizeOf aMallocSizeOf) {
|
|
if (mFlags & gfxTextRunFactory::TEXT_RUN_SIZE_ACCOUNTED) {
|
|
return 0;
|
|
}
|
|
mFlags |= gfxTextRunFactory::TEXT_RUN_SIZE_ACCOUNTED;
|
|
return SizeOfIncludingThis(aMallocSizeOf);
|
|
}
|
|
void ResetSizeOfAccountingFlags() {
|
|
mFlags &= ~gfxTextRunFactory::TEXT_RUN_SIZE_ACCOUNTED;
|
|
}
|
|
|
|
// shaping state - for some font features, fallback is required that
|
|
// affects the entire run. for example, fallback for one script/font
|
|
// portion of a textrun requires fallback to be applied to the entire run
|
|
|
|
enum ShapingState {
|
|
eShapingState_Normal, // default state
|
|
eShapingState_ShapingWithFeature, // have shaped with feature
|
|
eShapingState_ShapingWithFallback, // have shaped with fallback
|
|
eShapingState_Aborted, // abort initial iteration
|
|
eShapingState_ForceFallbackFeature // redo with fallback forced on
|
|
};
|
|
|
|
ShapingState GetShapingState() const { return mShapingState; }
|
|
void SetShapingState(ShapingState aShapingState) {
|
|
mShapingState = aShapingState;
|
|
}
|
|
|
|
#ifdef DEBUG
|
|
void Dump(FILE* aOutput);
|
|
#endif
|
|
|
|
protected:
|
|
/**
|
|
* Create a textrun, and set its mCharacterGlyphs to point immediately
|
|
* after the base object; this is ONLY used in conjunction with placement
|
|
* new, after allocating a block large enough for the glyph records to
|
|
* follow the base textrun object.
|
|
*/
|
|
gfxTextRun(const gfxTextRunFactory::Parameters *aParams,
|
|
uint32_t aLength, gfxFontGroup *aFontGroup, uint32_t aFlags);
|
|
|
|
/**
|
|
* Helper for the Create() factory method to allocate the required
|
|
* glyph storage for a textrun object with the basic size aSize,
|
|
* plus room for aLength glyph records.
|
|
*/
|
|
static void* AllocateStorageForTextRun(size_t aSize, uint32_t aLength);
|
|
|
|
// Pointer to the array of CompressedGlyph records; must be initialized
|
|
// when the object is constructed.
|
|
CompressedGlyph *mCharacterGlyphs;
|
|
|
|
private:
|
|
// **** general helpers ****
|
|
|
|
// Get the total advance for a range of glyphs.
|
|
int32_t GetAdvanceForGlyphs(uint32_t aStart, uint32_t aEnd);
|
|
|
|
// Spacing for characters outside the range aSpacingStart/aSpacingEnd
|
|
// is assumed to be zero; such characters are not passed to aProvider.
|
|
// This is useful to protect aProvider from being passed character indices
|
|
// it is not currently able to handle.
|
|
bool GetAdjustedSpacingArray(uint32_t aStart, uint32_t aEnd,
|
|
PropertyProvider *aProvider,
|
|
uint32_t aSpacingStart, uint32_t aSpacingEnd,
|
|
nsTArray<PropertyProvider::Spacing> *aSpacing);
|
|
|
|
// **** ligature helpers ****
|
|
// (Platforms do the actual ligaturization, but we need to do a bunch of stuff
|
|
// to handle requests that begin or end inside a ligature)
|
|
|
|
// if aProvider is null then mBeforeSpacing and mAfterSpacing are set to zero
|
|
LigatureData ComputeLigatureData(uint32_t aPartStart, uint32_t aPartEnd,
|
|
PropertyProvider *aProvider);
|
|
gfxFloat ComputePartialLigatureWidth(uint32_t aPartStart, uint32_t aPartEnd,
|
|
PropertyProvider *aProvider);
|
|
void DrawPartialLigature(gfxFont *aFont, uint32_t aStart, uint32_t aEnd,
|
|
gfxPoint *aPt, PropertyProvider *aProvider,
|
|
TextRunDrawParams& aParams, uint16_t aOrientation);
|
|
// Advance aStart to the start of the nearest ligature; back up aEnd
|
|
// to the nearest ligature end; may result in *aStart == *aEnd
|
|
void ShrinkToLigatureBoundaries(uint32_t *aStart, uint32_t *aEnd);
|
|
// result in appunits
|
|
gfxFloat GetPartialLigatureWidth(uint32_t aStart, uint32_t aEnd, PropertyProvider *aProvider);
|
|
void AccumulatePartialLigatureMetrics(gfxFont *aFont,
|
|
uint32_t aStart, uint32_t aEnd,
|
|
gfxFont::BoundingBoxType aBoundingBoxType,
|
|
gfxContext *aRefContext,
|
|
PropertyProvider *aProvider,
|
|
uint16_t aOrientation,
|
|
Metrics *aMetrics);
|
|
|
|
// **** measurement helper ****
|
|
void AccumulateMetricsForRun(gfxFont *aFont, uint32_t aStart, uint32_t aEnd,
|
|
gfxFont::BoundingBoxType aBoundingBoxType,
|
|
gfxContext *aRefContext,
|
|
PropertyProvider *aProvider,
|
|
uint32_t aSpacingStart, uint32_t aSpacingEnd,
|
|
uint16_t aOrientation,
|
|
Metrics *aMetrics);
|
|
|
|
// **** drawing helper ****
|
|
void DrawGlyphs(gfxFont *aFont, uint32_t aStart, uint32_t aEnd,
|
|
gfxPoint *aPt, PropertyProvider *aProvider,
|
|
uint32_t aSpacingStart, uint32_t aSpacingEnd,
|
|
TextRunDrawParams& aParams, uint16_t aOrientation);
|
|
|
|
// XXX this should be changed to a GlyphRun plus a maybe-null GlyphRun*,
|
|
// for smaller size especially in the super-common one-glyphrun case
|
|
nsAutoTArray<GlyphRun,1> mGlyphRuns;
|
|
|
|
void *mUserData;
|
|
gfxFontGroup *mFontGroup; // addrefed on creation, but our reference
|
|
// may be released by ReleaseFontGroup()
|
|
gfxSkipChars mSkipChars;
|
|
nsExpirationState mExpirationState;
|
|
|
|
bool mSkipDrawing; // true if the font group we used had a user font
|
|
// download that's in progress, so we should hide text
|
|
// until the download completes (or timeout fires)
|
|
bool mReleasedFontGroup; // we already called NS_RELEASE on
|
|
// mFontGroup, so don't do it again
|
|
|
|
// shaping state for handling variant fallback features
|
|
// such as subscript/superscript variant glyphs
|
|
ShapingState mShapingState;
|
|
};
|
|
|
|
class gfxFontGroup : public gfxTextRunFactory {
|
|
public:
|
|
static void Shutdown(); // platform must call this to release the languageAtomService
|
|
|
|
gfxFontGroup(const mozilla::FontFamilyList& aFontFamilyList,
|
|
const gfxFontStyle *aStyle,
|
|
gfxUserFontSet *aUserFontSet = nullptr);
|
|
|
|
virtual ~gfxFontGroup();
|
|
|
|
// Returns first valid font in the fontlist or default font.
|
|
// Initiates userfont loads if userfont not loaded
|
|
virtual gfxFont* GetFirstValidFont(uint32_t aCh = 0x20);
|
|
|
|
// Returns the first font in the font-group that has an OpenType MATH table,
|
|
// or null if no such font is available. The GetMathConstant methods may be
|
|
// called on the returned font.
|
|
gfxFont *GetFirstMathFont();
|
|
|
|
const gfxFontStyle *GetStyle() const { return &mStyle; }
|
|
|
|
virtual gfxFontGroup *Copy(const gfxFontStyle *aStyle);
|
|
|
|
/**
|
|
* The listed characters should be treated as invisible and zero-width
|
|
* when creating textruns.
|
|
*/
|
|
static bool IsInvalidChar(uint8_t ch);
|
|
static bool IsInvalidChar(char16_t ch);
|
|
|
|
/**
|
|
* Make a textrun for a given string.
|
|
* If aText is not persistent (aFlags & TEXT_IS_PERSISTENT), the
|
|
* textrun will copy it.
|
|
* This calls FetchGlyphExtents on the textrun.
|
|
*/
|
|
virtual gfxTextRun *MakeTextRun(const char16_t *aString, uint32_t aLength,
|
|
const Parameters *aParams, uint32_t aFlags,
|
|
gfxMissingFontRecorder *aMFR);
|
|
/**
|
|
* Make a textrun for a given string.
|
|
* If aText is not persistent (aFlags & TEXT_IS_PERSISTENT), the
|
|
* textrun will copy it.
|
|
* This calls FetchGlyphExtents on the textrun.
|
|
*/
|
|
virtual gfxTextRun *MakeTextRun(const uint8_t *aString, uint32_t aLength,
|
|
const Parameters *aParams, uint32_t aFlags,
|
|
gfxMissingFontRecorder *aMFR);
|
|
|
|
/**
|
|
* Textrun creation helper for clients that don't want to pass
|
|
* a full Parameters record.
|
|
*/
|
|
template<typename T>
|
|
gfxTextRun *MakeTextRun(const T *aString, uint32_t aLength,
|
|
gfxContext *aRefContext,
|
|
int32_t aAppUnitsPerDevUnit,
|
|
uint32_t aFlags,
|
|
gfxMissingFontRecorder *aMFR)
|
|
{
|
|
gfxTextRunFactory::Parameters params = {
|
|
aRefContext, nullptr, nullptr, nullptr, 0, aAppUnitsPerDevUnit
|
|
};
|
|
return MakeTextRun(aString, aLength, ¶ms, aFlags, aMFR);
|
|
}
|
|
|
|
/**
|
|
* Get the (possibly-cached) width of the hyphen character.
|
|
* The aCtx and aAppUnitsPerDevUnit parameters will be used only if
|
|
* needed to initialize the cached hyphen width; otherwise they are
|
|
* ignored.
|
|
*/
|
|
gfxFloat GetHyphenWidth(gfxTextRun::PropertyProvider* aProvider);
|
|
|
|
/**
|
|
* Make a text run representing a single hyphen character.
|
|
* This will use U+2010 HYPHEN if available in the first font,
|
|
* otherwise fall back to U+002D HYPHEN-MINUS.
|
|
* The caller is responsible for deleting the returned text run
|
|
* when no longer required.
|
|
*/
|
|
gfxTextRun *MakeHyphenTextRun(gfxContext *aCtx,
|
|
uint32_t aAppUnitsPerDevUnit);
|
|
|
|
/**
|
|
* Check whether a given font (specified by its gfxFontEntry)
|
|
* is already in the fontgroup's list of actual fonts
|
|
*/
|
|
bool HasFont(const gfxFontEntry *aFontEntry);
|
|
|
|
// This returns the preferred underline for this font group.
|
|
// Some CJK fonts have wrong underline offset in its metrics.
|
|
// If this group has such "bad" font, each platform's gfxFontGroup
|
|
// initialized mUnderlineOffset. The value should be lower value of
|
|
// first font's metrics and the bad font's metrics. Otherwise, this
|
|
// returns from first font's metrics.
|
|
enum { UNDERLINE_OFFSET_NOT_SET = INT16_MAX };
|
|
virtual gfxFloat GetUnderlineOffset();
|
|
|
|
virtual already_AddRefed<gfxFont>
|
|
FindFontForChar(uint32_t ch, uint32_t prevCh, uint32_t aNextCh,
|
|
int32_t aRunScript, gfxFont *aPrevMatchedFont,
|
|
uint8_t *aMatchType);
|
|
|
|
// search through pref fonts for a character, return nullptr if no matching pref font
|
|
virtual already_AddRefed<gfxFont> WhichPrefFontSupportsChar(uint32_t aCh);
|
|
|
|
already_AddRefed<gfxFont>
|
|
WhichSystemFontSupportsChar(uint32_t aCh, uint32_t aNextCh,
|
|
int32_t aRunScript);
|
|
|
|
template<typename T>
|
|
void ComputeRanges(nsTArray<gfxTextRange>& mRanges,
|
|
const T *aString, uint32_t aLength,
|
|
int32_t aRunScript, uint16_t aOrientation);
|
|
|
|
gfxUserFontSet* GetUserFontSet();
|
|
|
|
// With downloadable fonts, the composition of the font group can change as fonts are downloaded
|
|
// for each change in state of the user font set, the generation value is bumped to avoid picking up
|
|
// previously created text runs in the text run word cache. For font groups based on stylesheets
|
|
// with no @font-face rule, this always returns 0.
|
|
uint64_t GetGeneration();
|
|
|
|
// generation of the latest fontset rebuild, 0 when no fontset present
|
|
uint64_t GetRebuildGeneration();
|
|
|
|
// used when logging text performance
|
|
gfxTextPerfMetrics *GetTextPerfMetrics() { return mTextPerf; }
|
|
void SetTextPerfMetrics(gfxTextPerfMetrics *aTextPerf) { mTextPerf = aTextPerf; }
|
|
|
|
// This will call UpdateUserFonts() if the user font set is changed.
|
|
void SetUserFontSet(gfxUserFontSet *aUserFontSet);
|
|
|
|
// If there is a user font set, check to see whether the font list or any
|
|
// caches need updating.
|
|
virtual void UpdateUserFonts();
|
|
|
|
// search for a specific userfont in the list of fonts
|
|
bool ContainsUserFont(const gfxUserFontEntry* aUserFont);
|
|
|
|
bool ShouldSkipDrawing() const {
|
|
return mSkipDrawing;
|
|
}
|
|
|
|
class LazyReferenceContextGetter {
|
|
public:
|
|
virtual already_AddRefed<gfxContext> GetRefContext() = 0;
|
|
};
|
|
// The gfxFontGroup keeps ownership of this textrun.
|
|
// It is only guaranteed to exist until the next call to GetEllipsisTextRun
|
|
// (which might use a different appUnitsPerDev value or flags) for the font
|
|
// group, or until UpdateUserFonts is called, or the fontgroup is destroyed.
|
|
// Get it/use it/forget it :) - don't keep a reference that might go stale.
|
|
gfxTextRun* GetEllipsisTextRun(int32_t aAppUnitsPerDevPixel, uint32_t aFlags,
|
|
LazyReferenceContextGetter& aRefContextGetter);
|
|
|
|
// helper method for resolving generic font families
|
|
static void
|
|
ResolveGenericFontNames(mozilla::FontFamilyType aGenericType,
|
|
nsIAtom *aLanguage,
|
|
nsTArray<nsString>& aGenericFamilies);
|
|
|
|
protected:
|
|
class FamilyFace {
|
|
public:
|
|
FamilyFace() : mFamily(nullptr), mFontEntry(nullptr),
|
|
mNeedsBold(false), mFontCreated(false),
|
|
mLoading(false), mInvalid(false)
|
|
{ }
|
|
|
|
FamilyFace(gfxFontFamily* aFamily, gfxFont* aFont)
|
|
: mFamily(aFamily), mNeedsBold(false), mFontCreated(true),
|
|
mLoading(false), mInvalid(false)
|
|
{
|
|
NS_ASSERTION(aFont, "font pointer must not be null");
|
|
NS_ASSERTION(!aFamily ||
|
|
aFamily->ContainsFace(aFont->GetFontEntry()),
|
|
"font is not a member of the given family");
|
|
mFont = aFont;
|
|
NS_ADDREF(aFont);
|
|
}
|
|
|
|
FamilyFace(gfxFontFamily* aFamily, gfxFontEntry* aFontEntry,
|
|
bool aNeedsBold)
|
|
: mFamily(aFamily), mNeedsBold(aNeedsBold), mFontCreated(false),
|
|
mLoading(false), mInvalid(false)
|
|
{
|
|
NS_ASSERTION(aFontEntry, "font entry pointer must not be null");
|
|
NS_ASSERTION(!aFamily ||
|
|
aFamily->ContainsFace(aFontEntry),
|
|
"font is not a member of the given family");
|
|
mFontEntry = aFontEntry;
|
|
NS_ADDREF(aFontEntry);
|
|
}
|
|
|
|
FamilyFace(const FamilyFace& aOtherFamilyFace)
|
|
: mFamily(aOtherFamilyFace.mFamily),
|
|
mNeedsBold(aOtherFamilyFace.mNeedsBold),
|
|
mFontCreated(aOtherFamilyFace.mFontCreated),
|
|
mLoading(aOtherFamilyFace.mLoading),
|
|
mInvalid(aOtherFamilyFace.mInvalid)
|
|
{
|
|
if (mFontCreated) {
|
|
mFont = aOtherFamilyFace.mFont;
|
|
NS_ADDREF(mFont);
|
|
} else {
|
|
mFontEntry = aOtherFamilyFace.mFontEntry;
|
|
NS_IF_ADDREF(mFontEntry);
|
|
}
|
|
}
|
|
|
|
~FamilyFace()
|
|
{
|
|
if (mFontCreated) {
|
|
NS_RELEASE(mFont);
|
|
} else {
|
|
NS_IF_RELEASE(mFontEntry);
|
|
}
|
|
}
|
|
|
|
FamilyFace& operator=(const FamilyFace& aOther)
|
|
{
|
|
if (mFontCreated) {
|
|
NS_RELEASE(mFont);
|
|
} else {
|
|
NS_IF_RELEASE(mFontEntry);
|
|
}
|
|
|
|
mFamily = aOther.mFamily;
|
|
mNeedsBold = aOther.mNeedsBold;
|
|
mFontCreated = aOther.mFontCreated;
|
|
mLoading = aOther.mLoading;
|
|
mInvalid = aOther.mInvalid;
|
|
|
|
if (mFontCreated) {
|
|
mFont = aOther.mFont;
|
|
NS_ADDREF(mFont);
|
|
} else {
|
|
mFontEntry = aOther.mFontEntry;
|
|
NS_IF_ADDREF(mFontEntry);
|
|
}
|
|
|
|
return *this;
|
|
}
|
|
|
|
gfxFontFamily* Family() const { return mFamily.get(); }
|
|
gfxFont* Font() const {
|
|
return mFontCreated ? mFont : nullptr;
|
|
}
|
|
|
|
gfxFontEntry* FontEntry() const {
|
|
return mFontCreated ? mFont->GetFontEntry() : mFontEntry;
|
|
}
|
|
|
|
bool NeedsBold() const { return mNeedsBold; }
|
|
bool IsUserFontContainer() const {
|
|
return FontEntry()->mIsUserFontContainer;
|
|
}
|
|
bool IsLoading() const { return mLoading; }
|
|
bool IsInvalid() const { return mInvalid; }
|
|
void CheckState(bool& aSkipDrawing);
|
|
void SetLoading(bool aIsLoading) { mLoading = aIsLoading; }
|
|
void SetInvalid() { mInvalid = true; }
|
|
|
|
void SetFont(gfxFont* aFont)
|
|
{
|
|
NS_ASSERTION(aFont, "font pointer must not be null");
|
|
NS_ADDREF(aFont);
|
|
if (mFontCreated) {
|
|
NS_RELEASE(mFont);
|
|
} else {
|
|
NS_IF_RELEASE(mFontEntry);
|
|
}
|
|
mFont = aFont;
|
|
mFontCreated = true;
|
|
mLoading = false;
|
|
}
|
|
|
|
bool EqualsUserFont(const gfxUserFontEntry* aUserFont) const;
|
|
|
|
private:
|
|
nsRefPtr<gfxFontFamily> mFamily;
|
|
// either a font or a font entry exists
|
|
union {
|
|
gfxFont* mFont;
|
|
gfxFontEntry* mFontEntry;
|
|
};
|
|
bool mNeedsBold : 1;
|
|
bool mFontCreated : 1;
|
|
bool mLoading : 1;
|
|
bool mInvalid : 1;
|
|
};
|
|
|
|
// List of font families, either named or generic.
|
|
// Generic names map to system pref fonts based on language.
|
|
mozilla::FontFamilyList mFamilyList;
|
|
|
|
// Fontlist containing a font entry for each family found. gfxFont objects
|
|
// are created as needed and userfont loads are initiated when needed.
|
|
// Code should be careful about addressing this array directly.
|
|
nsTArray<FamilyFace> mFonts;
|
|
|
|
nsRefPtr<gfxFont> mDefaultFont;
|
|
gfxFontStyle mStyle;
|
|
|
|
gfxFloat mUnderlineOffset;
|
|
gfxFloat mHyphenWidth;
|
|
|
|
nsRefPtr<gfxUserFontSet> mUserFontSet;
|
|
uint64_t mCurrGeneration; // track the current user font set generation, rebuild font list if needed
|
|
|
|
gfxTextPerfMetrics *mTextPerf;
|
|
|
|
// Cache a textrun representing an ellipsis (useful for CSS text-overflow)
|
|
// at a specific appUnitsPerDevPixel size and orientation
|
|
nsAutoPtr<gfxTextRun> mCachedEllipsisTextRun;
|
|
|
|
// cache the most recent pref font to avoid general pref font lookup
|
|
nsRefPtr<gfxFontFamily> mLastPrefFamily;
|
|
nsRefPtr<gfxFont> mLastPrefFont;
|
|
eFontPrefLang mLastPrefLang; // lang group for last pref font
|
|
eFontPrefLang mPageLang;
|
|
bool mLastPrefFirstFont; // is this the first font in the list of pref fonts for this lang group?
|
|
|
|
bool mSkipDrawing; // hide text while waiting for a font
|
|
// download to complete (or fallback
|
|
// timer to fire)
|
|
|
|
// xxx - gfxPangoFontGroup skips UpdateUserFonts
|
|
bool mSkipUpdateUserFonts;
|
|
|
|
/**
|
|
* Textrun creation short-cuts for special cases where we don't need to
|
|
* call a font shaper to generate glyphs.
|
|
*/
|
|
gfxTextRun *MakeEmptyTextRun(const Parameters *aParams, uint32_t aFlags);
|
|
gfxTextRun *MakeSpaceTextRun(const Parameters *aParams, uint32_t aFlags);
|
|
gfxTextRun *MakeBlankTextRun(uint32_t aLength,
|
|
const Parameters *aParams, uint32_t aFlags);
|
|
|
|
// Initialize the list of fonts
|
|
void BuildFontList();
|
|
|
|
// Get the font at index i within the fontlist.
|
|
// Will initiate userfont load if not already loaded.
|
|
// May return null if userfont not loaded or if font invalid
|
|
virtual gfxFont* GetFontAt(int32_t i, uint32_t aCh = 0x20);
|
|
|
|
// Whether there's a font loading for a given family in the fontlist
|
|
// for a given character
|
|
bool FontLoadingForFamily(gfxFontFamily* aFamily, uint32_t aCh) const;
|
|
|
|
// will always return a font or force a shutdown
|
|
gfxFont* GetDefaultFont();
|
|
|
|
// Init this font group's font metrics. If there no bad fonts, you don't need to call this.
|
|
// But if there are one or more bad fonts which have bad underline offset,
|
|
// you should call this with the *first* bad font.
|
|
void InitMetricsForBadFont(gfxFont* aBadFont);
|
|
|
|
// Set up the textrun glyphs for an entire text run:
|
|
// find script runs, and then call InitScriptRun for each
|
|
template<typename T>
|
|
void InitTextRun(gfxContext *aContext,
|
|
gfxTextRun *aTextRun,
|
|
const T *aString,
|
|
uint32_t aLength,
|
|
gfxMissingFontRecorder *aMFR);
|
|
|
|
// InitTextRun helper to handle a single script run, by finding font ranges
|
|
// and calling each font's InitTextRun() as appropriate
|
|
template<typename T>
|
|
void InitScriptRun(gfxContext *aContext,
|
|
gfxTextRun *aTextRun,
|
|
const T *aString,
|
|
uint32_t aScriptRunStart,
|
|
uint32_t aScriptRunEnd,
|
|
int32_t aRunScript,
|
|
gfxMissingFontRecorder *aMFR);
|
|
|
|
// Helper for font-matching:
|
|
// When matching the italic case, allow use of the regular face
|
|
// if it supports a character but the italic one doesn't.
|
|
// Return null if regular face doesn't support aCh
|
|
already_AddRefed<gfxFont>
|
|
FindNonItalicFaceForChar(gfxFontFamily* aFamily, uint32_t aCh);
|
|
|
|
// helper methods for looking up fonts
|
|
|
|
// iterate over the fontlist, lookup names and expand generics
|
|
void EnumerateFontList(nsIAtom *aLanguage, void *aClosure = nullptr);
|
|
|
|
// expand a generic to a list of specific names based on prefs
|
|
void FindGenericFonts(mozilla::FontFamilyType aGenericType,
|
|
nsIAtom *aLanguage,
|
|
void *aClosure);
|
|
|
|
// lookup and add a font with a given name (i.e. *not* a generic!)
|
|
virtual void FindPlatformFont(const nsAString& aName,
|
|
bool aUseFontSet,
|
|
void *aClosure);
|
|
|
|
static nsILanguageAtomService* gLangService;
|
|
};
|
|
|
|
// A "missing font recorder" is to be used during text-run creation to keep
|
|
// a record of any scripts encountered for which font coverage was lacking;
|
|
// when Flush() is called, it sends a notification that front-end code can use
|
|
// to download fonts on demand (or whatever else it wants to do).
|
|
|
|
#define GFX_MISSING_FONTS_NOTIFY_PREF "gfx.missing_fonts.notify"
|
|
|
|
class gfxMissingFontRecorder {
|
|
public:
|
|
gfxMissingFontRecorder()
|
|
{
|
|
MOZ_COUNT_CTOR(gfxMissingFontRecorder);
|
|
memset(&mMissingFonts, 0, sizeof(mMissingFonts));
|
|
}
|
|
|
|
~gfxMissingFontRecorder()
|
|
{
|
|
#ifdef DEBUG
|
|
for (uint32_t i = 0; i < kNumScriptBitsWords; i++) {
|
|
NS_ASSERTION(mMissingFonts[i] == 0,
|
|
"failed to flush the missing-font recorder");
|
|
}
|
|
#endif
|
|
MOZ_COUNT_DTOR(gfxMissingFontRecorder);
|
|
}
|
|
|
|
// record this script code in our mMissingFonts bitset
|
|
void RecordScript(int32_t aScriptCode)
|
|
{
|
|
mMissingFonts[uint32_t(aScriptCode) >> 5] |=
|
|
(1 << (uint32_t(aScriptCode) & 0x1f));
|
|
}
|
|
|
|
// send a notification of any missing-scripts that have been
|
|
// recorded, and clear the mMissingFonts set for re-use
|
|
void Flush();
|
|
|
|
// forget any missing-scripts that have been recorded up to now;
|
|
// called before discarding a recorder we no longer care about
|
|
void Clear()
|
|
{
|
|
memset(&mMissingFonts, 0, sizeof(mMissingFonts));
|
|
}
|
|
|
|
private:
|
|
// Number of 32-bit words needed for the missing-script flags
|
|
static const uint32_t kNumScriptBitsWords =
|
|
((MOZ_NUM_SCRIPT_CODES + 31) / 32);
|
|
uint32_t mMissingFonts[kNumScriptBitsWords];
|
|
};
|
|
|
|
#endif
|