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      1 /*
      2  * Copyright 2014 Google Inc.
      3  *
      4  * Use of this source code is governed by a BSD-style license that can be
      5  * found in the LICENSE file.
      6  */
      7 
      8 #ifndef SkTestScalerContext_DEFINED
      9 #define SkTestScalerContext_DEFINED
     10 
     11 #include "SkFixed.h"
     12 #include "SkPaint.h"
     13 #include "SkPath.h"
     14 #include "SkRefCnt.h"
     15 #include "SkTDArray.h"
     16 #include "SkTypeface.h"
     17 
     18 class SkTestFont;
     19 
     20 struct SkTestFontData {
     21     const SkScalar* fPoints;
     22     const unsigned char* fVerbs;
     23     const unsigned* fCharCodes;
     24     const size_t fCharCodesCount;
     25     const SkFixed* fWidths;
     26     const SkPaint::FontMetrics& fMetrics;
     27     const char* fName;
     28     SkFontStyle fStyle;
     29     sk_sp<SkTestFont> fCachedFont;
     30 };
     31 
     32 class SkTestFont : public SkRefCnt {
     33 public:
     34     SkTestFont(const SkTestFontData& );
     35     virtual ~SkTestFont();
     36     int codeToIndex(SkUnichar charCode) const;
     37     void init(const SkScalar* pts, const unsigned char* verbs);
     38 private:
     39     const unsigned* fCharCodes;
     40     const size_t fCharCodesCount;
     41     const SkFixed* fWidths;
     42     const SkPaint::FontMetrics& fMetrics;
     43     const char* fName;
     44     SkPath** fPaths;
     45     friend class SkTestTypeface;
     46     typedef SkRefCnt INHERITED;
     47 };
     48 
     49 
     50 class SkTestTypeface : public SkTypeface {
     51 public:
     52     SkTestTypeface(sk_sp<SkTestFont>, const SkFontStyle& style);
     53     void getAdvance(SkGlyph* glyph);
     54     void getFontMetrics(SkPaint::FontMetrics* metrics);
     55     void getMetrics(SkGlyph* glyph);
     56     void getPath(SkGlyphID glyph, SkPath* path);
     57 protected:
     58     SkScalerContext* onCreateScalerContext(const SkScalerContextEffects&,
     59                                            const SkDescriptor* desc) const override;
     60     void onFilterRec(SkScalerContextRec* rec) const override;
     61     std::unique_ptr<SkAdvancedTypefaceMetrics> onGetAdvancedMetrics() const override;
     62 
     63     SkStreamAsset* onOpenStream(int* ttcIndex) const override {
     64         return nullptr;
     65     }
     66 
     67     void onGetFontDescriptor(SkFontDescriptor* desc, bool* isLocal) const override;
     68 
     69     int onCharsToGlyphs(const void* chars, Encoding encoding,
     70                         uint16_t glyphs[], int glyphCount) const override;
     71 
     72     int onCountGlyphs() const override {
     73         return (int) fTestFont->fCharCodesCount;
     74     }
     75 
     76     int onGetUPEM() const override {
     77         return 2048;
     78     }
     79 
     80     void onGetFamilyName(SkString* familyName) const override;
     81     SkTypeface::LocalizedStrings* onCreateFamilyNameIterator() const override;
     82 
     83     int onGetVariationDesignPosition(SkFontArguments::VariationPosition::Coordinate coordinates[],
     84                                      int coordinateCount) const override
     85     {
     86         return 0;
     87     }
     88 
     89     int onGetTableTags(SkFontTableTag tags[]) const override {
     90         return 0;
     91     }
     92 
     93     size_t onGetTableData(SkFontTableTag tag, size_t offset,
     94                           size_t length, void* data) const override {
     95         return 0;
     96     }
     97 private:
     98     sk_sp<SkTestFont> fTestFont;
     99     friend class SkTestScalerContext;
    100 };
    101 
    102 #endif
    103