C++ SkPath::reset方法代码示例

 void draw_fill(SkCanvas* canvas, const SkRect& rect, SkScalar width) {
     if (rect.isEmpty()) {
         return;
     }
     SkPaint paint;
     paint.setColor(0x1f1f0f0f);
     paint.setStyle(SkPaint::kStroke_Style);
     paint.setStrokeWidth(width);
     SkPath path;
     SkScalar maxSide = SkTMax(rect.width(), rect.height()) / 2;
     SkPoint center = { rect.fLeft + maxSide, rect.fTop + maxSide };
     path.addCircle(center.fX, center.fY, maxSide);
     canvas->drawPath(path, paint);
     paint.setStyle(SkPaint::kFill_Style);
     path.reset();
     path.addCircle(center.fX, center.fY, maxSide - width / 2);
     paint.setColor(0x3f0f1f3f);
     canvas->drawPath(path, paint);
     path.reset();
     path.setFillType(SkPath::kEvenOdd_FillType);
     path.addCircle(center.fX, center.fY, maxSide + width / 2);
     SkRect outside = SkRect::MakeXYWH(center.fX - maxSide - width, center.fY - maxSide - width, 
             (maxSide + width) * 2, (maxSide + width) * 2);
     path.addRect(outside);
     canvas->drawPath(path, paint);
 }

    virtual void onDraw(SkCanvas* canvas) {
        if (false) test_rev(canvas); // avoid bit rot, suppress warning
        SkRect r = { 10, 10, 100, 60 };

        SkPath path;

        path.addRect(r); test_rev(canvas, path);

        canvas->translate(0, 100);
        path.offset(20, 20);
        path.addRect(r); test_rev(canvas, path);

        canvas->translate(0, 100);
        path.reset();
        path.moveTo(10, 10); path.lineTo(30, 30);
        path.addOval(r);
        r.offset(50, 20);
        path.addOval(r);
        test_rev(canvas, path);

        SkPaint paint;
        paint.setTextSize(SkIntToScalar(100));
        SkTypeface* hira = SkTypeface::CreateFromName("Hiragino Maru Gothic Pro", SkTypeface::kNormal);
        SkSafeUnref(paint.setTypeface(hira));
        path.reset();
        paint.getTextPath("e", 1, 50, 50, &path);
        canvas->translate(0, 100);
        test_rev(canvas, path);
    }

static void test_undetected_paths(skiatest::Reporter* reporter) {
    SkPath path;
    path.moveTo(0, 62.5f);
    path.lineTo(0, 3.5f);
    path.conicTo(0, 0, 3.5f, 0, 0.70710677f);
    path.lineTo(196.5f, 0);
    path.conicTo(200, 0, 200, 3.5f, 0.70710677f);
    path.lineTo(200, 62.5f);
    path.conicTo(200, 66, 196.5f, 66, 0.70710677f);
    path.lineTo(3.5f, 66);
    path.conicTo(0, 66, 0, 62.5, 0.70710677f);
    path.close();
    force_path_contains_rrect(reporter, path);

    path.reset();
    path.moveTo(0, 81.5f);
    path.lineTo(0, 3.5f);
    path.conicTo(0, 0, 3.5f, 0, 0.70710677f);
    path.lineTo(149.5, 0);
    path.conicTo(153, 0, 153, 3.5f, 0.70710677f);
    path.lineTo(153, 81.5f);
    path.conicTo(153, 85, 149.5f, 85, 0.70710677f);
    path.lineTo(3.5f, 85);
    path.conicTo(0, 85, 0, 81.5f, 0.70710677f);
    path.close();
    force_path_contains_rrect(reporter, path);

    path.reset();
    path.moveTo(14, 1189);
    path.lineTo(14, 21);
    path.conicTo(14, 14, 21, 14, 0.70710677f);
    path.lineTo(1363, 14);
    path.conicTo(1370, 14, 1370, 21, 0.70710677f);
    path.lineTo(1370, 1189);
    path.conicTo(1370, 1196, 1363, 1196, 0.70710677f);
    path.lineTo(21, 1196);
    path.conicTo(14, 1196, 14, 1189, 0.70710677f);
    path.close();
    force_path_contains_rrect(reporter, path);

    path.reset();
    path.moveTo(14, 1743);
    path.lineTo(14, 21);
    path.conicTo(14, 14, 21, 14, 0.70710677f);
    path.lineTo(1363, 14);
    path.conicTo(1370, 14, 1370, 21, 0.70710677f);
    path.lineTo(1370, 1743);
    path.conicTo(1370, 1750, 1363, 1750, 0.70710677f);
    path.lineTo(21, 1750);
    path.conicTo(14, 1750, 14, 1743, 0.70710677f);
    path.close();
    force_path_contains_rrect(reporter, path);
}

    virtual void onDraw(SkCanvas* canvas) {
        // explicitly add spaces, to test a prev. bug
        const char* text = "Ham bur ge fons";
        int len = SkToInt(strlen(text));
        SkPath path;

        SkPaint paint;
        paint.setAntiAlias(true);
        paint.setTextSize(SkIntToScalar(48));

        canvas->translate(SkIntToScalar(10), SkIntToScalar(64));

        canvas->drawText(text, len, 0, 0, paint);
        paint.getTextPath(text, len, 0, 0, &path);
        strokePath(canvas, path);
        path.reset();

        SkAutoTArray<SkPoint>  pos(len);
        SkAutoTArray<SkScalar> widths(len);
        paint.getTextWidths(text, len, &widths[0]);

        SkLCGRandom rand;
        SkScalar x = SkIntToScalar(20);
        SkScalar y = SkIntToScalar(100);
        for (int i = 0; i < len; ++i) {
            pos[i].set(x, y + rand.nextSScalar1() * 24);
            x += widths[i];
        }

        canvas->translate(0, SkIntToScalar(64));

        canvas->drawPosText(text, len, &pos[0], paint);
        paint.getPosTextPath(text, len, &pos[0], &path);
        strokePath(canvas, path);
    }

// Need to exercise drawing an inverse-path whose bounds intersect the clip,
// but whose edges do not (since its a quad which draws only in the bottom half
// of its bounds).
// In the debug build, we used to assert in this case, until it was fixed.
//
static void test_inversepathwithclip() {
    SkPath path;

    path.moveTo(0, 20);
    path.quadTo(10, 10, 20, 20);
    path.toggleInverseFillType();

    SkPaint paint;

    auto surface(SkSurface::MakeRasterN32Premul(640, 480));
    SkCanvas* canvas = surface->getCanvas();
    canvas->save();
    canvas->clipRect(SkRect::MakeWH(19, 11));

    paint.setAntiAlias(false);
    canvas->drawPath(path, paint);
    paint.setAntiAlias(true);
    canvas->drawPath(path, paint);

    canvas->restore();

    // Now do the test again, with the path flipped, so we only draw in the
    // top half of our bounds, and have the clip intersect our bounds at the
    // bottom.
    path.reset();   // preserves our filltype
    path.moveTo(0, 10);
    path.quadTo(10, 20, 20, 10);
    canvas->clipRect(SkRect::MakeXYWH(0, 19, 19, 11));

    paint.setAntiAlias(false);
    canvas->drawPath(path, paint);
    paint.setAntiAlias(true);
    canvas->drawPath(path, paint);
}

void operate(const SkPath& one, const SkPath& two, ShapeOp op, SkPath& result) {
    result.reset();
    result.setFillType(SkPath::kEvenOdd_FillType);
    // turn path into list of segments
    SkTArray<Op::Contour> contours;
    // FIXME: add self-intersecting cubics' T values to segment
    Op::EdgeBuilder builder(one, contours);
    const int aXorMask = builder.xorMask();
    builder.addOperand(two);
    const int bXorMask = builder.xorMask();
    builder.finish();
    SkTDArray<Op::Contour*> contourList;
    makeContourList(contours, contourList);
    Op::Contour** currentPtr = contourList.begin();
    if (!currentPtr) {
        return;
    }
    Op::Contour** listEnd = contourList.end();
    // find all intersections between segments
    do {
        Op::Contour** nextPtr = currentPtr;
        Op::Contour* current = *currentPtr++;
        Op::Contour* next;
        do {
            next = *nextPtr++;
        } while (addIntersectTs(current, next) && nextPtr != listEnd);
    } while (currentPtr != listEnd);
    // eat through coincident edges
    coincidenceCheck(contourList);
    fixOtherTIndex(contourList);
    // construct closed contours
    Op::PathWrapper wrapper(result);
    bridgeOp(contourList, op, aXorMask, bXorMask, wrapper);
}

static void test_path_bounds(skiatest::Reporter* reporter) {
    SkPath path;
    SkAAClip clip;
    const int height = 40;
    const SkScalar sheight = SkIntToScalar(height);

    path.addOval(SkRect::MakeWH(sheight, sheight));
    REPORTER_ASSERT(reporter, sheight == path.getBounds().height());
    clip.setPath(path, nullptr, true);
    REPORTER_ASSERT(reporter, height == clip.getBounds().height());

    // this is the trimmed height of this cubic (with aa). The critical thing
    // for this test is that it is less than height, which represents just
    // the bounds of the path's control-points.
    //
    // This used to fail until we tracked the MinY in the BuilderBlitter.
    //
    const int teardrop_height = 12;
    path.reset();
    imoveTo(path, 0, 20);
    icubicTo(path, 40, 40, 40, 0, 0, 20);
    REPORTER_ASSERT(reporter, sheight == path.getBounds().height());
    clip.setPath(path, nullptr, true);
    REPORTER_ASSERT(reporter, teardrop_height == clip.getBounds().height());
}

    virtual void onDraw(int loops, SkCanvas* canvas) {

        SkPaint paint;
        this->setupPaint(&paint);

        for (int i = 0; i < loops; ++i) {
            // jostle the clip regions each time to prevent caching
            fClipRect.offset((i % 2) == 0 ? SkIntToScalar(10) : SkIntToScalar(-10), 0);
            fClipPath.reset();
            fClipPath.addRoundRect(fClipRect,
                                   SkIntToScalar(5), SkIntToScalar(5));
            SkASSERT(fClipPath.isConvex());

            canvas->save();
#if 1
            if (fDoPath) {
                canvas->clipPath(fClipPath, kReplace_SkClipOp, fDoAA);
            } else {
                canvas->clipRect(fClipRect, kReplace_SkClipOp, fDoAA);
            }

            canvas->drawRect(fDrawRect, paint);
#else
            // this path tests out directly draw the clip primitive
            // use it to comparing just drawing the clip vs. drawing using
            // the clip
            if (fDoPath) {
                canvas->drawPath(fClipPath, paint);
            } else {
                canvas->drawRect(fClipRect, paint);
            }
#endif
            canvas->restore();
        }
    }

void SkPathStroker::finishContour(bool close, bool currIsLine) {
    if (fSegmentCount > 0) {
        SkPoint pt;

        if (close) {
            fJoiner(&fOuter, &fInner, fPrevUnitNormal, fPrevPt,
                    fFirstUnitNormal, fRadius, fInvMiterLimit,
                    fPrevIsLine, currIsLine);
            fOuter.close();
            // now add fInner as its own contour
            fInner.getLastPt(&pt);
            fOuter.moveTo(pt.fX, pt.fY);
            fOuter.reversePathTo(fInner);
            fOuter.close();
        } else {    // add caps to start and end
            // cap the end
            fInner.getLastPt(&pt);
            fCapper(&fOuter, fPrevPt, fPrevNormal, pt,
                    currIsLine ? &fInner : NULL);
            fOuter.reversePathTo(fInner);
            // cap the start
            fCapper(&fOuter, fFirstPt, -fFirstNormal, fFirstOuterPt,
                    fPrevIsLine ? &fInner : NULL);
            fOuter.close();
        }
    }
    fInner.reset();
    fSegmentCount = -1;
}

static void patheffect_slide(SkCanvas* canvas) {
    SkPaint paint;
    paint.setAntiAlias(true);
    paint.setStyle(SkPaint::kStroke_Style);

    SkPath path;
    path.moveTo(20, 20);
    path.lineTo(70, 120);
    path.lineTo(120, 30);
    path.lineTo(170, 80);
    path.lineTo(240, 50);

    size_t i;
    canvas->save();
    for (i = 0; i < SK_ARRAY_COUNT(gPE); i++) {
        gPE[i](&paint);
        canvas->drawPath(path, paint);
        canvas->translate(0, 75);
    }
    canvas->restore();

    path.reset();
    SkRect r = { 0, 0, 250, 120 };
    path.addOval(r, SkPath::kCW_Direction);
    r.inset(50, 50);
    path.addRect(r, SkPath::kCCW_Direction);

    canvas->translate(320, 20);
    for (i = 0; i < SK_ARRAY_COUNT(gPE2); i++) {
        gPE2[i](&paint);
        canvas->drawPath(path, paint);
        canvas->translate(0, 160);
    }
}

void SampleWindow::onSizeChange() {
    this->INHERITED::onSizeChange();

    SkView::F2BIter iter(this);
    SkView* view = iter.next();
    view->setSize(this->width(), this->height());

    // rebuild our clippath
    {
        const SkScalar W = this->width();
        const SkScalar H = this->height();

        fClipPath.reset();
#if 0
        for (SkScalar y = SK_Scalar1; y < H; y += SkIntToScalar(32)) {
            SkRect r;
            r.set(SK_Scalar1, y, SkIntToScalar(30), y + SkIntToScalar(30));
            for (; r.fLeft < W; r.offset(SkIntToScalar(32), 0))
                fClipPath.addRect(r);
        }
#else
        SkRect r;
        r.set(0, 0, W, H);
        fClipPath.addRect(r, SkPath::kCCW_Direction);
        r.set(W/4, H/4, W*3/4, H*3/4);
        fClipPath.addRect(r, SkPath::kCW_Direction);
#endif
    }

    this->updateTitle();    // to refresh our config
}

    void onDraw(SkCanvas* canvas) override {
        SkPaint p;
        p.setColor(SK_ColorRED);
        p.setAntiAlias(true);

        canvas->clear(0xFFFFFFFF);

        canvas->save();
        canvas->rotate(1);
        const SkScalar R = 115.2f, C = 128.0f;
        SkPath path;
        path.moveTo(C + R, C);
        for (int i = 1; i < 8; ++i) {
            SkScalar a = 2.6927937f * i;
            SkScalar cosine;
            SkScalar sine = SkScalarSinCos(a, &cosine);
            path.lineTo(C + R * cosine, C + R * sine);
        }
        canvas->drawPath(path, p);
        canvas->restore();

        canvas->save();
        canvas->translate(200, 0);
        canvas->rotate(1);
        p.setStyle(SkPaint::kStroke_Style);
        p.setStrokeWidth(5);
        canvas->drawPath(path, p);
        canvas->restore();


        // The following two paths test if we correctly cumulates the alpha on the middle pixel
        // column where the left rect and the right rect abut.
        p.setStyle(SkPaint::kFill_Style);
        canvas->translate(0, 300);
        path.reset();
        path.addRect({20, 20, 100.4999f, 100});
        path.addRect({100.5001f, 20, 200, 100});
        canvas->drawPath(path, p);

        canvas->translate(300, 0);
        path.reset();
        path.addRect({20, 20, 100.1f, 100});
        path.addRect({100.9f, 20, 200, 100});
        canvas->drawPath(path, p);
    }

void
skiaDrawLine(caskbench_context_t *ctx, shapes_t *args)
{
    path.reset();

    path.moveTo(args->x, args->y);
    path.lineTo(args->x + args->width, args->y + args->height);

    ctx->skia_canvas->drawPath(path, *(ctx->skia_paint));
}

    /**
     * Called on a background thread. Here we can only modify fBackPaths.
     */
    void runAnimationTask(double t, double dt, int w, int h) override {
        const float tsec = static_cast<float>(t);
        this->INHERITED::runAnimationTask(t, 0.5 * dt, w, h);

        for (int i = 0; i < kNumPaths; ++i) {
            const Glyph& glyph = fGlyphs[i];
            const SkMatrix& backMatrix = fBackMatrices[i];

            const Sk2f matrix[3] = {
                Sk2f(backMatrix.getScaleX(), backMatrix.getSkewY()),
                Sk2f(backMatrix.getSkewX(), backMatrix.getScaleY()),
                Sk2f(backMatrix.getTranslateX(), backMatrix.getTranslateY())
            };

            SkPath* backpath = &fBackPaths[i];
            backpath->reset();
            backpath->setFillType(SkPath::kEvenOdd_FillType);

            SkPath::RawIter iter(glyph.fPath);
            SkPath::Verb verb;
            SkPoint pts[4];

            while ((verb = iter.next(pts)) != SkPath::kDone_Verb) {
                switch (verb) {
                    case SkPath::kMove_Verb: {
                        SkPoint pt = fWaves.apply(tsec, matrix, pts[0]);
                        backpath->moveTo(pt.x(), pt.y());
                        break;
                    }
                    case SkPath::kLine_Verb: {
                        SkPoint endpt = fWaves.apply(tsec, matrix, pts[1]);
                        backpath->lineTo(endpt.x(), endpt.y());
                        break;
                    }
                    case SkPath::kQuad_Verb: {
                        SkPoint controlPt = fWaves.apply(tsec, matrix, pts[1]);
                        SkPoint endpt = fWaves.apply(tsec, matrix, pts[2]);
                        backpath->quadTo(controlPt.x(), controlPt.y(), endpt.x(), endpt.y());
                        break;
                    }
                    case SkPath::kClose_Verb: {
                        backpath->close();
                        break;
                    }
                    case SkPath::kCubic_Verb:
                    case SkPath::kConic_Verb:
                    case SkPath::kDone_Verb:
                        SK_ABORT("Unexpected path verb");
                        break;
                }
            }
        }
    }

static void test_convexity(skiatest::Reporter* reporter) {
    static const SkPath::Convexity C = SkPath::kConcave_Convexity;
    static const SkPath::Convexity V = SkPath::kConvex_Convexity;

    SkPath path;

    REPORTER_ASSERT(reporter, V == SkPath::ComputeConvexity(path));
    path.addCircle(0, 0, 10);
    REPORTER_ASSERT(reporter, V == SkPath::ComputeConvexity(path));
    path.addCircle(0, 0, 10);   // 2nd circle
    REPORTER_ASSERT(reporter, C == SkPath::ComputeConvexity(path));
    path.reset();
    path.addRect(0, 0, 10, 10, SkPath::kCCW_Direction);
    REPORTER_ASSERT(reporter, V == SkPath::ComputeConvexity(path));
    path.reset();
    path.addRect(0, 0, 10, 10, SkPath::kCW_Direction);
    REPORTER_ASSERT(reporter, V == SkPath::ComputeConvexity(path));
    
    static const struct {
        const char*         fPathStr;
        SkPath::Convexity   fExpectedConvexity;
    } gRec[] = {
        { "", SkPath::kConvex_Convexity },
        { "0 0", SkPath::kConvex_Convexity },
        { "0 0 10 10", SkPath::kConvex_Convexity },
        { "0 0 10 10 20 20 0 0 10 10", SkPath::kConcave_Convexity },
        { "0 0 10 10 10 20", SkPath::kConvex_Convexity },
        { "0 0 10 10 10 0", SkPath::kConvex_Convexity },
        { "0 0 10 10 10 0 0 10", SkPath::kConcave_Convexity },
        { "0 0 10 0 0 10 -10 -10", SkPath::kConcave_Convexity },
    };

    for (size_t i = 0; i < SK_ARRAY_COUNT(gRec); ++i) {
        SkPath path;
        setFromString(&path, gRec[i].fPathStr);
        SkPath::Convexity c = SkPath::ComputeConvexity(path);
        REPORTER_ASSERT(reporter, c == gRec[i].fExpectedConvexity);
    }
}