tools/fonts/SkTestTypeface.h

/*
 * Copyright 2014 Google Inc.
 *
 * Use of this source code is governed by a BSD-style license that can be
 * found in the LICENSE file.
 */

#ifndef SkTestTypeface_DEFINED
#define SkTestTypeface_DEFINED

#include "SkFixed.h"
#include "SkFontArguments.h"
#include "SkFontMetrics.h"
#include "SkFontStyle.h"
#include "SkPaint.h"
#include "SkRefCnt.h"
#include "SkScalar.h"
#include "SkTypeface.h"
#include "SkTypes.h"

#include <memory>

class SkDescriptor;
class SkFontDescriptor;
class SkGlyph;
class SkPath;
class SkScalerContext;
class SkStreamAsset;
class SkString;
class SkTestFont;
struct SkAdvancedTypefaceMetrics;
struct SkScalerContextEffects;
struct SkScalerContextRec;

struct SkTestFontData {
    const SkScalar* fPoints;
    const unsigned char* fVerbs;
    const SkUnichar* fCharCodes;
    const size_t fCharCodesCount;
    const SkFixed* fWidths;
    const SkFontMetrics& fMetrics;
    const char* fName;
    SkFontStyle fStyle;
};

class SkTestFont : public SkRefCnt {
public:
    SkTestFont(const SkTestFontData& );
    virtual ~SkTestFont();
    SkGlyphID glyphForUnichar(SkUnichar charCode) const;
    void init(const SkScalar* pts, const unsigned char* verbs);
private:
    const SkUnichar* fCharCodes;
    const size_t fCharCodesCount;
    const SkFixed* fWidths;
    const SkFontMetrics& fMetrics;
    const char* fName;
    SkPath** fPaths;
    friend class SkTestTypeface;
    typedef SkRefCnt INHERITED;
};


class SkTestTypeface : public SkTypeface {
public:
    SkTestTypeface(sk_sp<SkTestFont>, const SkFontStyle& style);
    void getAdvance(SkGlyph* glyph);
    void getFontMetrics(SkFontMetrics* metrics);
    void getPath(SkGlyphID glyph, SkPath* path);
protected:
    SkScalerContext* onCreateScalerContext(const SkScalerContextEffects&,
                                           const SkDescriptor* desc) const override;
    void onFilterRec(SkScalerContextRec* rec) const override;
    void getGlyphToUnicodeMap(SkUnichar* glyphToUnicode) const override;
    std::unique_ptr<SkAdvancedTypefaceMetrics> onGetAdvancedMetrics() const override;

    SkStreamAsset* onOpenStream(int* ttcIndex) const override {
        return nullptr;
    }

    sk_sp<SkTypeface> onMakeClone(const SkFontArguments& args) const override {
        return sk_ref_sp(this);
    }

    void onGetFontDescriptor(SkFontDescriptor* desc, bool* isLocal) const override;

    int onCharsToGlyphs(const void* chars, Encoding encoding,
                        uint16_t glyphs[], int glyphCount) const override;

    int onCountGlyphs() const override {
        return (int) fTestFont->fCharCodesCount;
    }

    int onGetUPEM() const override {
        return 2048;
    }

    void onGetFamilyName(SkString* familyName) const override;
    SkTypeface::LocalizedStrings* onCreateFamilyNameIterator() const override;

    int onGetVariationDesignPosition(SkFontArguments::VariationPosition::Coordinate coordinates[],
                                     int coordinateCount) const override
    {
        return 0;
    }

    int onGetVariationDesignParameters(SkFontParameters::Variation::Axis parameters[],
                                       int parameterCount) const override
    {
        return 0;
    }

    int onGetTableTags(SkFontTableTag tags[]) const override {
        return 0;
    }

    size_t onGetTableData(SkFontTableTag tag, size_t offset,
                          size_t length, void* data) const override {
        return 0;
    }
private:
    sk_sp<SkTestFont> fTestFont;
    friend class SkTestScalerContext;
};

#endif