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* Copyright 2011 Google Inc.
* Use of this source code is governed by a BSD-style license that can be
* found in the LICENSE file.
#ifndef SkPDFFont_DEFINED
#define SkPDFFont_DEFINED
#include "include/core/SkRefCnt.h"
#include "include/core/SkTypeface.h"
#include "include/core/SkTypes.h"
#include "src/core/SkAdvancedTypefaceMetrics.h"
#include "src/core/SkStrikeCache.h"
#include "src/pdf/SkPDFGlyphUse.h"
#include "src/pdf/SkPDFTypes.h"
#include <vector>
class SkPDFDocument;
class SkStrike;
class SkString;
/** \class SkPDFFont
A PDF Object class representing a font. The font may have resources
attached to it in order to embed the font. SkPDFFonts are canonicalized
so that resource deduplication will only include one copy of a font.
This class uses the same pattern as SkPDFGraphicState, a static weak
reference to each instantiated class.
class SkPDFFont {
SkPDFFont() {}
SkPDFFont& operator=(SkPDFFont&&);
/** Returns the typeface represented by this class. Returns nullptr for the
* default typeface.
SkTypeface* typeface() const { return fTypeface.get(); }
/** Returns the font type represented in this font. For Type0 fonts,
* returns the type of the descendant font.
SkAdvancedTypefaceMetrics::FontType getType() const { return fFontType; }
static SkAdvancedTypefaceMetrics::FontType FontType(const SkAdvancedTypefaceMetrics&);
static void GetType1GlyphNames(const SkTypeface&, SkString*);
static bool IsMultiByte(SkAdvancedTypefaceMetrics::FontType type) {
return type == SkAdvancedTypefaceMetrics::kType1CID_Font ||
type == SkAdvancedTypefaceMetrics::kTrueType_Font;
/** Returns true if this font encoding supports glyph IDs above 255.
bool multiByteGlyphs() const { return SkPDFFont::IsMultiByte(this->getType()); }
/** Return true if this font has an encoding for the passed glyph id.
bool hasGlyph(SkGlyphID gid) {
return (gid >= this->firstGlyphID() && gid <= this->lastGlyphID()) || gid == 0;
/** Convert the input glyph ID into the font encoding. */
SkGlyphID glyphToPDFFontEncoding(SkGlyphID gid) const {
if (this->multiByteGlyphs() || gid == 0) {
return gid;
SkASSERT(gid >= this->firstGlyphID() && gid <= this->lastGlyphID());
SkASSERT(this->firstGlyphID() > 0);
return gid - this->firstGlyphID() + 1;
void noteGlyphUsage(SkGlyphID glyph) {
SkPDFIndirectReference indirectReference() const { return fIndirectReference; }
/** Get the font resource for the passed typeface and glyphID. The
* reference count of the object is incremented and it is the caller's
* responsibility to unreference it when done. This is needed to
* accommodate the weak reference pattern used when the returned object
* is new and has no other references.
* @param typeface The typeface to find, not nullptr.
* @param glyphID Specify which section of a large font is of interest.
static SkPDFFont* GetFontResource(SkPDFDocument* doc,
SkStrike* cache,
SkTypeface* typeface,
SkGlyphID glyphID);
/** Gets SkAdvancedTypefaceMetrics, and caches the result.
* @param typeface can not be nullptr.
* @return nullptr only when typeface is bad.
static const SkAdvancedTypefaceMetrics* GetMetrics(const SkTypeface* typeface,
SkPDFDocument* canon);
static const std::vector<SkUnichar>& GetUnicodeMap(const SkTypeface* typeface,
SkPDFDocument* canon);
static void PopulateCommonFontDescriptor(SkPDFDict* descriptor,
const SkAdvancedTypefaceMetrics&,
uint16_t emSize,
int16_t defaultWidth);
void emitSubset(SkPDFDocument*) const;
* Return false iff the typeface has its NotEmbeddable flag set.
* typeface is not nullptr
static bool CanEmbedTypeface(SkTypeface*, SkPDFDocument*);
SkGlyphID firstGlyphID() const { return fGlyphUsage.firstNonZero(); }
SkGlyphID lastGlyphID() const { return fGlyphUsage.lastGlyph(); }
const SkPDFGlyphUse& glyphUsage() const { return fGlyphUsage; }
sk_sp<SkTypeface> refTypeface() const { return fTypeface; }
sk_sp<SkTypeface> fTypeface;
SkPDFGlyphUse fGlyphUsage;
SkPDFIndirectReference fIndirectReference;
SkAdvancedTypefaceMetrics::FontType fFontType = (SkAdvancedTypefaceMetrics::FontType)(-1);
SkGlyphID firstGlyphID,
SkGlyphID lastGlyphID,
SkAdvancedTypefaceMetrics::FontType fontType,
SkPDFIndirectReference indirectReference);
// The glyph IDs accessible with this font. For Type1 (non CID) fonts,
// this will be a subset if the font has more than 255 glyphs.
SkPDFFont(const SkPDFFont&) = delete;
SkPDFFont& operator=(const SkPDFFont&) = delete;