| /* |
| * 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 SkAdvancedTypefaceMetrics_DEFINED |
| #define SkAdvancedTypefaceMetrics_DEFINED |
| |
| #include "SkRect.h" |
| #include "SkRefCnt.h" |
| #include "SkString.h" |
| #include "SkTDArray.h" |
| #include "SkTemplates.h" |
| #include "SkSinglyLinkedList.h" |
| |
| /** \class SkAdvancedTypefaceMetrics |
| |
| The SkAdvancedTypefaceMetrics class is used by the PDF backend to correctly |
| embed typefaces. This class is created and filled in with information by |
| SkTypeface::getAdvancedTypefaceMetrics. |
| */ |
| |
| class SkAdvancedTypefaceMetrics : public SkRefCnt { |
| public: |
| |
| SkAdvancedTypefaceMetrics() |
| : fType(SkAdvancedTypefaceMetrics::kOther_Font) |
| , fFlags(SkAdvancedTypefaceMetrics::kEmpty_FontFlag) |
| , fLastGlyphID(0) |
| , fEmSize(0) |
| , fStyle(0) |
| , fItalicAngle(0) |
| , fAscent(0) |
| , fDescent(0) |
| , fStemV(0) |
| , fCapHeight(0) |
| , fBBox(SkIRect::MakeEmpty()) {} |
| |
| ~SkAdvancedTypefaceMetrics(); |
| |
| /** Retrieve advance data for glyphs. Used by the PDF backend. It |
| calls underlying platform dependent API getAdvance to acquire |
| the data. |
| @param num_glyphs Total number of glyphs in the given font. |
| @param glyphIDs For per-glyph info, specify subset of the |
| font by giving glyph ids. Each integer |
| represents a glyph id. Passing nullptr |
| means all glyphs in the font. |
| @param glyphIDsCount Number of elements in subsetGlyphIds. |
| Ignored if glyphIDs is nullptr. |
| @param getAdvance A function that takes a glyph id and |
| passes back advance data from the |
| typeface. Returns false on failure. |
| */ |
| typedef std::function<bool(int glyphId, int16_t* advanceData)> GetAdvance; |
| void setGlyphWidths(int num_glyphs, |
| const uint32_t* subsetGlyphIDs, |
| uint32_t subsetGlyphIDsLength, |
| GetAdvance getAdvance); |
| |
| SkString fFontName; |
| |
| enum FontType { |
| kType1_Font, |
| kType1CID_Font, |
| kCFF_Font, |
| kTrueType_Font, |
| kOther_Font, |
| }; |
| // The type of the underlying font program. This field determines which |
| // of the following fields are valid. If it is kOther_Font the per glyph |
| // information will never be populated. |
| FontType fType; |
| |
| enum FontFlags { |
| kEmpty_FontFlag = 0x0, //!<No flags set |
| kMultiMaster_FontFlag = 0x1, //!<May be true for Type1, CFF, or TrueType fonts. |
| kNotEmbeddable_FontFlag = 0x2, //!<May not be embedded. |
| kNotSubsettable_FontFlag = 0x4, //!<May not be subset. |
| }; |
| // Global font flags. |
| FontFlags fFlags; |
| |
| uint16_t fLastGlyphID; // The last valid glyph ID in the font. |
| uint16_t fEmSize; // The size of the em box (defines font units). |
| |
| // These enum values match the values used in the PDF file format. |
| enum StyleFlags { |
| kFixedPitch_Style = 0x00001, |
| kSerif_Style = 0x00002, |
| kScript_Style = 0x00008, |
| kItalic_Style = 0x00040, |
| kAllCaps_Style = 0x10000, |
| kSmallCaps_Style = 0x20000, |
| kForceBold_Style = 0x40000 |
| }; |
| uint16_t fStyle; // Font style characteristics. |
| int16_t fItalicAngle; // Counterclockwise degrees from vertical of the |
| // dominant vertical stroke for an Italic face. |
| // The following fields are all in font units. |
| int16_t fAscent; // Max height above baseline, not including accents. |
| int16_t fDescent; // Max depth below baseline (negative). |
| int16_t fStemV; // Thickness of dominant vertical stem. |
| int16_t fCapHeight; // Height (from baseline) of top of flat capitals. |
| |
| SkIRect fBBox; // The bounding box of all glyphs (in font units). |
| |
| template <typename Data> |
| struct AdvanceMetric { |
| enum MetricType { |
| kDefault, // Default advance: fAdvance.count = 1 |
| kRange, // Advances for a range: fAdvance.count = fEndID-fStartID |
| kRun // fStartID-fEndID have same advance: fAdvance.count = 1 |
| }; |
| MetricType fType; |
| uint16_t fStartId; |
| uint16_t fEndId; |
| SkTDArray<Data> fAdvance; |
| AdvanceMetric(uint16_t startId) : fStartId(startId) {} |
| AdvanceMetric(AdvanceMetric&& other) |
| : fType(other.fType) |
| , fStartId(other.fStartId) |
| , fEndId(other.fEndId) { |
| fAdvance.swap(other.fAdvance); |
| } |
| AdvanceMetric& operator=(AdvanceMetric&& other) { |
| fType = other.fType; |
| fStartId = other.fStartId; |
| fEndId = other.fEndId; |
| fAdvance.swap(other.fAdvance); |
| return *this; |
| } |
| AdvanceMetric(const AdvanceMetric&) = delete; |
| AdvanceMetric& operator=(const AdvanceMetric&) = delete; |
| }; |
| |
| struct VerticalMetric { |
| int16_t fVerticalAdvance; |
| int16_t fOriginXDisp; // Horiz. displacement of the secondary origin. |
| int16_t fOriginYDisp; // Vert. displacement of the secondary origin. |
| }; |
| typedef AdvanceMetric<int16_t> WidthRange; |
| typedef AdvanceMetric<VerticalMetric> VerticalAdvanceRange; |
| |
| // This is indexed by glyph id. |
| SkSinglyLinkedList<WidthRange> fGlyphWidths; |
| // Only used for Vertical CID fonts. |
| SkSinglyLinkedList<VerticalAdvanceRange> fVerticalMetrics; |
| |
| // The names of each glyph, only populated for postscript fonts. |
| SkAutoTDelete<SkAutoTArray<SkString> > fGlyphNames; |
| |
| // The mapping from glyph to Unicode, only populated if |
| // kToUnicode_PerGlyphInfo is passed to GetAdvancedTypefaceMetrics. |
| SkTDArray<SkUnichar> fGlyphToUnicode; |
| |
| static void FinishRange(WidthRange* range, |
| int endId, |
| WidthRange::MetricType type); |
| |
| private: |
| typedef SkRefCnt INHERITED; |
| }; |
| |
| |
| #endif |