tools/fonts/RandomScalerContext.h

/*
 * 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(SkSpan<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(SkSpan<const SkUnichar>, SkSpan<SkGlyphID>) 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(
                             SkSpan<SkFontArguments::VariationPosition::Coordinate>) const override;
    int onGetVariationDesignParameters(SkSpan<SkFontParameters::Variation::Axis>) const override;
    int onGetTableTags(SkSpan<SkFontTableTag>) 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