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8c877dc5ab
AutoTextRun now only needs a DrawTarget instead of an nsRenderingContext, and similar nsRenderingContext/gfxContext-to-DrawTarget replacements can be propagated a long way up the call graph. This patch replaces 93 occurrences of nsRenderingContext and 135 occurrences of gfxContext with DrawTarget; that's 13% of them. The patch is mostly plumbing changes. A couple of not-entirely-plumbing changes: - It adds a comment about the null check in gfxGlyphExtents::GetTightGlyphExtentsAppUnits(). - A couple of functions simply had an unused gfxContext or nsRenderingContext parameter removed, e.g. SetLineBreaks().
1198 lines
49 KiB
C++
1198 lines
49 KiB
C++
/* -*- Mode: C++; tab-width: 4; indent-tabs-mode: nil; c-basic-offset: 4 -*-
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* vim: set ts=4 et sw=4 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 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 "gfxFontConstants.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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typedef mozilla::gfx::DrawTarget DrawTarget;
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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 CharMayHaveEmphasisMark(uint32_t aPos) const {
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NS_ASSERTION(aPos < GetLength(), "aPos out of range");
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return mCharacterGlyphs[aPos].CharMayHaveEmphasisMark();
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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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/**
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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<DrawTarget> GetDrawTarget() = 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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* Draws the emphasis marks for this text run. Uses only GetSpacing
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* from aProvider. The provided point is the baseline origin of the
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* line of emphasis marks.
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*/
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void DrawEmphasisMarks(gfxContext* aContext, gfxTextRun* aMark,
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gfxFloat aMarkAdvance, gfxPoint aPt,
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uint32_t aStart, uint32_t aLength,
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PropertyProvider* aProvider);
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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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DrawTarget* aDrawTargetForTightBoundingBox,
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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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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 aDrawTargetForTightBoundingbox a reference DrawTarget 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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DrawTarget* aDrawTargetForTightBoundingBox,
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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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// 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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RefPtr<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;
|
|
};
|
|
|
|
class GlyphRunOffsetComparator {
|
|
public:
|
|
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() final {
|
|
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, DrawTarget* aDrawTarget,
|
|
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, 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) {
|
|
EnsureComplexGlyph(aIndex).SetIsTab();
|
|
}
|
|
void SetIsNewline(uint32_t aIndex) {
|
|
EnsureComplexGlyph(aIndex).SetIsNewline();
|
|
}
|
|
void SetNoEmphasisMark(uint32_t aIndex) {
|
|
EnsureComplexGlyph(aIndex).SetNoEmphasisMark();
|
|
}
|
|
|
|
/**
|
|
* 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(DrawTarget* aRefDrawTarget);
|
|
|
|
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;
|
|
}
|
|
|
|
int32_t GetAdvanceForGlyph(uint32_t aIndex)
|
|
{
|
|
const CompressedGlyph& glyphData = mCharacterGlyphs[aIndex];
|
|
if (glyphData.IsSimpleGlyph()) {
|
|
return glyphData.GetSimpleAdvance();
|
|
}
|
|
uint32_t glyphCount = glyphData.GetGlyphCount();
|
|
if (!glyphCount) {
|
|
return 0;
|
|
}
|
|
const DetailedGlyph* details = GetDetailedGlyphs(aIndex);
|
|
int32_t advance = 0;
|
|
for (uint32_t j = 0; j < glyphCount; ++j, ++details) {
|
|
advance += details->mAdvance;
|
|
}
|
|
return advance;
|
|
}
|
|
|
|
#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);
|
|
|
|
CompressedGlyph& EnsureComplexGlyph(uint32_t aIndex)
|
|
{
|
|
gfxShapedText::EnsureComplexGlyph(aIndex, mCharacterGlyphs[aIndex]);
|
|
return mCharacterGlyphs[aIndex];
|
|
}
|
|
|
|
// **** 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,
|
|
DrawTarget* aRefDrawTarget,
|
|
PropertyProvider *aProvider,
|
|
uint16_t aOrientation,
|
|
Metrics *aMetrics);
|
|
|
|
// **** measurement helper ****
|
|
void AccumulateMetricsForRun(gfxFont *aFont, uint32_t aStart, uint32_t aEnd,
|
|
gfxFont::BoundingBoxType aBoundingBoxType,
|
|
DrawTarget* aRefDrawTarget,
|
|
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,
|
|
gfxTextPerfMetrics* aTextPerf,
|
|
gfxUserFontSet* aUserFontSet,
|
|
gfxFloat aDevToCssSize);
|
|
|
|
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,
|
|
DrawTarget* aRefDrawTarget,
|
|
int32_t aAppUnitsPerDevUnit,
|
|
uint32_t aFlags,
|
|
gfxMissingFontRecorder *aMFR)
|
|
{
|
|
gfxTextRunFactory::Parameters params = {
|
|
aRefDrawTarget, 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(DrawTarget* aDrawTarget,
|
|
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);
|
|
|
|
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; }
|
|
|
|
// 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 LazyReferenceDrawTargetGetter {
|
|
public:
|
|
virtual already_AddRefed<DrawTarget> GetRefDrawTarget() = 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,
|
|
LazyReferenceDrawTargetGetter& aRefDrawTargetGetter);
|
|
|
|
protected:
|
|
// search through pref fonts for a character, return nullptr if no matching pref font
|
|
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);
|
|
|
|
class FamilyFace {
|
|
public:
|
|
FamilyFace() : mFamily(nullptr), mFontEntry(nullptr),
|
|
mNeedsBold(false), mFontCreated(false),
|
|
mLoading(false), mInvalid(false),
|
|
mCheckForFallbackFaces(false)
|
|
{ }
|
|
|
|
FamilyFace(gfxFontFamily* aFamily, gfxFont* aFont)
|
|
: mFamily(aFamily), mNeedsBold(false), mFontCreated(true),
|
|
mLoading(false), mInvalid(false), mCheckForFallbackFaces(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), mCheckForFallbackFaces(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),
|
|
mCheckForFallbackFaces(aOtherFamilyFace.mCheckForFallbackFaces)
|
|
{
|
|
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; }
|
|
bool CheckForFallbackFaces() const { return mCheckForFallbackFaces; }
|
|
void SetCheckForFallbackFaces() { mCheckForFallbackFaces = 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:
|
|
RefPtr<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;
|
|
bool mCheckForFallbackFaces : 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;
|
|
|
|
RefPtr<gfxFont> mDefaultFont;
|
|
gfxFontStyle mStyle;
|
|
|
|
gfxFloat mUnderlineOffset;
|
|
gfxFloat mHyphenWidth;
|
|
gfxFloat mDevToCssSize;
|
|
|
|
RefPtr<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
|
|
RefPtr<gfxFontFamily> mLastPrefFamily;
|
|
RefPtr<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(DrawTarget* aDrawTarget,
|
|
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(DrawTarget* aDrawTarget,
|
|
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);
|
|
|
|
// search all faces in a family for a fallback in cases where it's unclear
|
|
// whether the family might have a font for a given character
|
|
already_AddRefed<gfxFont>
|
|
FindFallbackFaceForChar(gfxFontFamily* aFamily, uint32_t aCh,
|
|
int32_t aRunScript);
|
|
|
|
// helper methods for looking up fonts
|
|
|
|
// lookup and add a font with a given name (i.e. *not* a generic!)
|
|
void AddPlatformFont(const nsAString& aName,
|
|
nsTArray<gfxFontFamily*>& aFamilyList);
|
|
|
|
// do style selection and add entries to list
|
|
void AddFamilyToFontList(gfxFontFamily* aFamily);
|
|
|
|
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
|