RandomScalerContext.h

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/*
 * Copyright 2015 Google Inc.
 *
 * Use of this source code is governed by a BSD-style license that can be
 * found in the LICENSE file.
 */
 
#ifndef RandomScalerContext_DEFINED
#define RandomScalerContext_DEFINED
 
#include "include/core/SkTypeface.h"
#include "src/core/SkScalerContext.h"
 
/*
 * This scaler context is for debug only purposes.  It will 'randomly' but deterministically return
 * LCD / A8 / BW / RBGA masks based off of the Glyph ID
 */
 
class SkRandomTypeface : public SkTypeface {
public:
    SkRandomTypeface(sk_sp<SkTypeface> proxy, const SkPaint&, bool fakeit);
 
    SkTypeface* proxy() const { return fProxy.get(); }
    const SkPaint& paint() const { return fPaint; }
 
protected:
    std::unique_ptr<SkScalerContext> onCreateScalerContext(const SkScalerContextEffects&,
                                                           const SkDescriptor*) const override;
    void onFilterRec(SkScalerContextRec*) const override;
    void getGlyphToUnicodeMap(SkUnichar*) const override;
    std::unique_ptr<SkAdvancedTypefaceMetrics> onGetAdvancedMetrics() const override;
    std::unique_ptr<SkStreamAsset> onOpenStream(int* ttcIndex) const override;
    sk_sp<SkTypeface> onMakeClone(const SkFontArguments& args) const override;
    void onGetFontDescriptor(SkFontDescriptor*, bool* isLocal) const override;
 
    void onCharsToGlyphs(const SkUnichar* chars, int count, SkGlyphID glyphs[]) const override;
    int onCountGlyphs() const override;
    int onGetUPEM() const override;
 
    void onGetFamilyName(SkString* familyName) const override;
    bool onGetPostScriptName(SkString*) const override;
    SkTypeface::LocalizedStrings* onCreateFamilyNameIterator() const override;
 
    void getPostScriptGlyphNames(SkString*) const override;
 
    bool onGlyphMaskNeedsCurrentColor() const override;
    int onGetVariationDesignPosition(SkFontArguments::VariationPosition::Coordinate coordinates[],
                                     int coordinateCount) const override;
    int onGetVariationDesignParameters(SkFontParameters::Variation::Axis parameters[],
                                       int parameterCount) const override;
    int onGetTableTags(SkFontTableTag tags[]) const override;
    size_t onGetTableData(SkFontTableTag, size_t offset, size_t length, void* data) const override;
 
private:
    sk_sp<SkTypeface> fProxy;
    SkPaint           fPaint;
    bool              fFakeIt;
};
 
#endif