src/core/SkPathView.h

/*
 * Copyright 2020 Google Inc.
 *
 * Use of this source code is governed by a BSD-style license that can be
 * found in the LICENSE file.
 */

#pragma once

#include "include/core/SkPathTypes.h"
#include "include/core/SkPoint.h"
#include "include/core/SkRect.h"
#include "include/private/SkPathRef.h"
#include "src/core/SkSpan.h"

struct SkPathView {
    SkPathView(SkSpan<const SkPoint> points, SkSpan<const uint8_t> verbs, SkSpan<const float> weights,
               SkPathFillType ft, SkPathConvexity ct, const SkRect& bounds, unsigned segmentMask,
               bool isFinite)
        : fPoints(points)
        , fVerbs(verbs)
        , fWeights(weights)
        , fBounds(bounds)
        , fFillType(ft)
        , fConvexity(ct)
        , fSegmentMask(segmentMask)
        , fIsFinite(isFinite)
    {
        this->validate();
    }

    bool isInverseFillType() const { return SkPathFillType_IsInverse(fFillType); }
    bool isConvex() const { return fConvexity == SkPathConvexity::kConvex; }

    bool isEmpty() const { return fPoints.size() == 0; }

    bool isRect(SkRect*) const;
    bool isFinite() const { return fIsFinite; }

    SkSpan<const SkPoint> fPoints;
    SkSpan<const uint8_t> fVerbs;
    SkSpan<const float>   fWeights;

    SkRect fBounds;

    SkPathFillType  fFillType;
    SkPathConvexity fConvexity;
    uint8_t         fSegmentMask;
    bool            fIsFinite;

#ifdef SK_DEBUG
    void validate() const;
#else
    void validate() const {}
#endif
};

static inline SkPathView SkPathView_triangle(const SkPoint pts[3], const SkRect& bounds) {
    static constexpr uint8_t verbs[] = {
        (uint8_t)SkPathVerb::kMove,
        (uint8_t)SkPathVerb::kLine,
        (uint8_t)SkPathVerb::kLine,
    };
    return SkPathView({pts, 3}, SkMakeSpan(verbs), {},
                      SkPathFillType::kWinding, SkPathConvexity::kConvex,
                      bounds, kLine_SkPathSegmentMask, true);
}

static inline SkPathView SkPathView_quad(const SkPoint pts[4], const SkRect& bounds) {
    static constexpr uint8_t verbs[] = {
        (uint8_t)SkPathVerb::kMove,
        (uint8_t)SkPathVerb::kLine,
        (uint8_t)SkPathVerb::kLine,
        (uint8_t)SkPathVerb::kLine,
    };
    return SkPathView({pts, 4}, SkMakeSpan(verbs), {},
                      SkPathFillType::kWinding, SkPathConvexity::kConvex,
                      bounds, kLine_SkPathSegmentMask, true);
};