/*

 * Copyright 2019 Google Inc.

 *

 * Use of this source code is governed by a BSD-style license that can be

 * found in the LICENSE file.

 */

#ifndef SkStrikeSpec_DEFINED

#define SkStrikeSpec_DEFINED

#include "include/core/SkMaskFilter.h"

#include "include/core/SkPathEffect.h"

#include "include/core/SkRefCnt.h"

#include "include/core/SkScalar.h"

#include "include/core/SkSpan.h"

#include "include/core/SkString.h"

#include "include/core/SkTypeface.h"

#include "include/core/SkTypes.h"

#include "include/private/base/SkTemplates.h"

#include "src/core/SkDescriptor.h"

#include "src/core/SkScalerContext.h"

#include <memory>

#include <tuple>

class SkFont;

class SkGlyph;

class SkMatrix;

class SkPaint;

class SkStrike;

class SkStrikeCache;

class SkSurfaceProps;

struct SkPackedGlyphID;

namespace sktext {

class StrikeForGPU;

class StrikeForGPUCacheInterface;

}

class SkStrikeSpec {

public:

    SkStrikeSpec(const SkDescriptor& descriptor, sk_sp<SkTypeface> typeface);

    SkStrikeSpec(const SkStrikeSpec&);

    SkStrikeSpec& operator=(const SkStrikeSpec&) = delete;

    SkStrikeSpec(SkStrikeSpec&&);

    SkStrikeSpec& operator=(SkStrikeSpec&&) = delete;

    ~SkStrikeSpec();

    // Create a strike spec for mask style cache entries.

    static SkStrikeSpec MakeMask(

            const SkFont& font,

            const SkPaint& paint,

            const SkSurfaceProps& surfaceProps,

            SkScalerContextFlags scalerContextFlags,

            const SkMatrix& deviceMatrix);

    // A strike for finding the max size for transforming masks. This is used to calculate the

    // maximum dimension of a SubRun of text.

    static SkStrikeSpec MakeTransformMask(

            const SkFont& font,

            const SkPaint& paint,

            const SkSurfaceProps& surfaceProps,

            SkScalerContextFlags scalerContextFlags,

            const SkMatrix& deviceMatrix);

    // Create a strike spec for path style cache entries.

    static std::tuple<SkStrikeSpec, SkScalar> MakePath(

            const SkFont& font,

            const SkPaint& paint,

            const SkSurfaceProps& surfaceProps,

            SkScalerContextFlags scalerContextFlags);

    // Create a canonical strike spec for device-less measurements.

    static std::tuple<SkStrikeSpec, SkScalar> MakeCanonicalized(

            const SkFont& font, const SkPaint* paint = nullptr);

    // Create a strike spec without a device, and does not switch over to path for large sizes.

    static SkStrikeSpec MakeWithNoDevice(const SkFont& font, const SkPaint* paint = nullptr);

    sk_sp<sktext::StrikeForGPU> findOrCreateScopedStrike(

            sktext::StrikeForGPUCacheInterface* cache) const;

    sk_sp<SkStrike> findOrCreateStrike() const;

    sk_sp<SkStrike> findOrCreateStrike(SkStrikeCache* cache) const;

    std::unique_ptr<SkScalerContext> createScalerContext() const {

        SkScalerContextEffects effects{fPathEffect.get(), fMaskFilter.get()};

        return fTypeface->createScalerContext(effects, fAutoDescriptor.getDesc());

    }

    const SkDescriptor& descriptor() const { return *fAutoDescriptor.getDesc(); }

    const SkTypeface& typeface() const { return *fTypeface; }

    static bool ShouldDrawAsPath(const SkPaint& paint, const SkFont& font, const SkMatrix& matrix);

    SkString dump() const;

private:

    SkStrikeSpec(

            const SkFont& font,

            const SkPaint& paint,

            const SkSurfaceProps& surfaceProps,

            SkScalerContextFlags scalerContextFlags,

            const SkMatrix& deviceMatrix);

    SkAutoDescriptor fAutoDescriptor;

    sk_sp<SkMaskFilter> fMaskFilter{nullptr};

    sk_sp<SkPathEffect> fPathEffect{nullptr};

    sk_sp<SkTypeface> fTypeface;

};

class SkBulkGlyphMetrics {

public:

    explicit SkBulkGlyphMetrics(const SkStrikeSpec& spec);

    ~SkBulkGlyphMetrics();

    SkSpan<const SkGlyph*> glyphs(SkSpan<const SkGlyphID> glyphIDs);

    const SkGlyph* glyph(SkGlyphID glyphID);

private:

    inline static constexpr int kTypicalGlyphCount = 20;

    skia_private::AutoSTArray<kTypicalGlyphCount, const SkGlyph*> fGlyphs;

    sk_sp<SkStrike> fStrike;

};

class SkBulkGlyphMetricsAndPaths {

public:

    explicit SkBulkGlyphMetricsAndPaths(const SkStrikeSpec& spec);

    explicit SkBulkGlyphMetricsAndPaths(sk_sp<SkStrike>&& strike);

    ~SkBulkGlyphMetricsAndPaths();

    SkSpan<const SkGlyph*> glyphs(SkSpan<const SkGlyphID> glyphIDs);

    const SkGlyph* glyph(SkGlyphID glyphID);

    void findIntercepts(const SkScalar bounds[2], SkScalar scale, SkScalar xPos,

                        const SkGlyph* glyph, SkScalar* array, int* count);

private:

    inline static constexpr int kTypicalGlyphCount = 20;

    skia_private::AutoSTArray<kTypicalGlyphCount, const SkGlyph*> fGlyphs;

    sk_sp<SkStrike> fStrike;

};

class SkBulkGlyphMetricsAndDrawables {

public:

    explicit SkBulkGlyphMetricsAndDrawables(const SkStrikeSpec& spec);

    explicit SkBulkGlyphMetricsAndDrawables(sk_sp<SkStrike>&& strike);

    ~SkBulkGlyphMetricsAndDrawables();

    SkSpan<const SkGlyph*> glyphs(SkSpan<const SkGlyphID> glyphIDs);

    const SkGlyph* glyph(SkGlyphID glyphID);

private:

    inline static constexpr int kTypicalGlyphCount = 20;

    skia_private::AutoSTArray<kTypicalGlyphCount, const SkGlyph*> fGlyphs;

    sk_sp<SkStrike> fStrike;

};

class SkBulkGlyphMetricsAndImages {

public:

    explicit SkBulkGlyphMetricsAndImages(const SkStrikeSpec& spec);

    explicit SkBulkGlyphMetricsAndImages(sk_sp<SkStrike>&& strike);

    ~SkBulkGlyphMetricsAndImages();

    SkSpan<const SkGlyph*> glyphs(SkSpan<const SkPackedGlyphID> packedIDs);

    const SkGlyph* glyph(SkPackedGlyphID packedID);

    const SkDescriptor& descriptor() const;

private:

    inline static constexpr int kTypicalGlyphCount = 64;

    skia_private::AutoSTArray<kTypicalGlyphCount, const SkGlyph*> fGlyphs;

    sk_sp<SkStrike> fStrike;

};

#endif  // SkStrikeSpec_DEFINED