C++ SkPath::isEmpty方法代码示例

void SkSVGDevice::AutoElement::addClipResources(const SkDraw& draw, Resources* resources) {
    SkASSERT(!draw.fClipStack->isWideOpen());

    SkPath clipPath;
    (void) draw.fClipStack->asPath(&clipPath);

    SkString clipID = fResourceBucket->addClip();
    const char* clipRule = clipPath.getFillType() == SkPath::kEvenOdd_FillType ?
                           "evenodd" : "nonzero";
    {
        // clipPath is in device space, but since we're only pushing transform attributes
        // to the leaf nodes, so are all our elements => SVG userSpaceOnUse == device space.
        AutoElement clipPathElement("clipPath", fWriter);
        clipPathElement.addAttribute("id", clipID);

        SkRect clipRect = SkRect::MakeEmpty();
        if (clipPath.isEmpty() || clipPath.isRect(&clipRect)) {
            AutoElement rectElement("rect", fWriter);
            rectElement.addRectAttributes(clipRect);
            rectElement.addAttribute("clip-rule", clipRule);
        } else {
            AutoElement pathElement("path", fWriter);
            pathElement.addPathAttributes(clipPath);
            pathElement.addAttribute("clip-rule", clipRule);
        }
    }

    resources->fClip.printf("url(#%s)", clipID.c_str());
}

sk_sp<SkPathEffect> SkPath1DPathEffect::Make(const SkPath& path, SkScalar advance, SkScalar phase,
        Style style) {
    if (advance <= 0 || path.isEmpty()) {
        return nullptr;
    }
    return sk_sp<SkPathEffect>(new SkPath1DPathEffect(path, advance, phase, style));
}

 void makePath() {
     if (fPath.isEmpty()) {
         const SkScalar radius = SkIntToScalar(45);
         fPath.addCircle(SkIntToScalar(50), SkIntToScalar(50), radius);
         fPath.addCircle(SkIntToScalar(100), SkIntToScalar(100), radius);
     }
 }

GrGLPath::GrGLPath(GrGpuGL* gpu, const SkPath& path) : INHERITED(gpu, kIsWrapped) {
#ifndef SK_SCALAR_IS_FLOAT
    GrCrash("Assumes scalar is float.");
#endif
    SkASSERT(!path.isEmpty());

    GL_CALL_RET(fPathID, GenPaths(1));

    SkSTArray<16, GrGLubyte, true> pathCommands;
    SkSTArray<16, SkPoint, true> pathPoints;

    int verbCnt = path.countVerbs();
    int pointCnt = path.countPoints();
    pathCommands.resize_back(verbCnt);
    pathPoints.resize_back(pointCnt);

    // TODO: Direct access to path points since we could pass them on directly.
    path.getPoints(&pathPoints[0], pointCnt);
    path.getVerbs(&pathCommands[0], verbCnt);

    GR_DEBUGCODE(int numPts = 0);
    for (int i = 0; i < verbCnt; ++i) {
        SkPath::Verb v = static_cast<SkPath::Verb>(pathCommands[i]);
        pathCommands[i] = verb_to_gl_path_cmd(v);
        GR_DEBUGCODE(numPts += num_pts(v));
    }
    GrAssert(pathPoints.count() == numPts);

    GL_CALL(PathCommands(fPathID,
                         verbCnt, &pathCommands[0],
                         2 * pointCnt, GR_GL_FLOAT, &pathPoints[0]));
    fBounds = path.getBounds();
}

bool GrAAConvexPathRenderer::onDrawPath(GrDrawTarget* target,
                                        GrPipelineBuilder* pipelineBuilder,
                                        GrColor color,
                                        const SkMatrix& vm,
                                        const SkPath& path,
                                        const SkStrokeRec&,
                                        bool antiAlias) {
    if (path.isEmpty()) {
        return true;
    }

    // We outset our vertices one pixel and add one more pixel for precision.
    // TODO create tighter bounds when we start reordering.
    SkRect devRect = path.getBounds();
    vm.mapRect(&devRect);
    devRect.outset(2, 2);

    AAConvexPathBatch::Geometry geometry;
    geometry.fColor = color;
    geometry.fViewMatrix = vm;
    geometry.fPath = path;

    SkAutoTUnref<GrBatch> batch(AAConvexPathBatch::Create(geometry));
    target->drawBatch(pipelineBuilder, batch, &devRect);

    return true;

}

SkPath1DPathEffect::SkPath1DPathEffect(const SkPath& path, SkScalar advance,
                                       SkScalar phase, Style style) : fPath(path)
{
    SkASSERT(advance > 0 && !path.isEmpty());
    // cleanup their phase parameter, inverting it so that it becomes an
    // offset along the path (to match the interpretation in PostScript)
    if (phase < 0) {
        phase = -phase;
        if (phase > advance) {
            phase = SkScalarMod(phase, advance);
        }
    } else {
        if (phase > advance) {
            phase = SkScalarMod(phase, advance);
        }
        phase = advance - phase;
    }
    // now catch the edge case where phase == advance (within epsilon)
    if (phase >= advance) {
        phase = 0;
    }
    SkASSERT(phase >= 0);

    fAdvance = advance;
    fInitialOffset = phase;

    if ((unsigned)style > kMorph_Style) {
        SkDEBUGF(("SkPath1DPathEffect style enum out of range %d\n", style));
    }
    fStyle = style;
}

GrGLPath::GrGLPath(GrGLGpu* gpu, const SkPath& origSkPath, const GrStrokeInfo& origStroke)
    : INHERITED(gpu, origSkPath, origStroke),
      fPathID(gpu->glPathRendering()->genPaths(1)) {

    if (origSkPath.isEmpty()) {
        InitPathObjectEmptyPath(gpu, fPathID);
        fShouldStroke = false;
        fShouldFill = false;
    } else {
        const SkPath* skPath = &origSkPath;
        SkTLazy<SkPath> tmpPath;
        const GrStrokeInfo* stroke = &origStroke;
        GrStrokeInfo tmpStroke(SkStrokeRec::kFill_InitStyle);

        if (stroke->isDashed()) {
            // Skia stroking and NVPR stroking differ with respect to dashing
            // pattern.
            // Convert a dashing to either a stroke or a fill.
            if (stroke->applyDashToPath(tmpPath.init(), &tmpStroke, *skPath)) {
                skPath = tmpPath.get();
                stroke = &tmpStroke;
            }
        }

        bool didInit = false;
        if (stroke->needToApply() && stroke->getCap() != SkPaint::kButt_Cap) {
            // Skia stroking and NVPR stroking differ with respect to stroking
            // end caps of empty subpaths.
            // Convert stroke to fill if path contains empty subpaths.
            didInit = InitPathObjectPathDataCheckingDegenerates(gpu, fPathID, *skPath);
            if (!didInit) {
                if (!tmpPath.isValid()) {
                    tmpPath.init();
                }
                SkAssertResult(stroke->applyToPath(tmpPath.get(), *skPath));
                skPath = tmpPath.get();
                tmpStroke.setFillStyle();
                stroke = &tmpStroke;
            }
        }

        if (!didInit) {
            InitPathObjectPathData(gpu, fPathID, *skPath);
        }

        fShouldStroke = stroke->needToApply();
        fShouldFill = stroke->isFillStyle() ||
                stroke->getStyle() == SkStrokeRec::kStrokeAndFill_Style;

        if (fShouldStroke) {
            InitPathObjectStroke(gpu, fPathID, *stroke);

            // FIXME: try to account for stroking, without rasterizing the stroke.
            fBounds.outset(stroke->getWidth(), stroke->getWidth());
        }
    }

    this->registerWithCache();
}

bool SkHitTestPath(const SkPath& path, SkRect& target, bool hires) {
    if (target.isEmpty()) {
        return false;
    }

    bool isInverse = path.isInverseFillType();
    if (path.isEmpty()) {
        return isInverse;
    }

    SkRect bounds = path.getBounds();

    bool sects = SkRect::Intersects(target, bounds);
    if (isInverse) {
        if (!sects) {
            return true;
        }
    } else {
        if (!sects) {
            return false;
        }
        if (target.contains(bounds)) {
            return true;
        }
    }

    SkPath devPath;
    const SkPath* pathPtr;
    SkRect        devTarget;

    if (hires) {
        const SkScalar coordLimit = SkIntToScalar(16384);
        const SkRect limit = { 0, 0, coordLimit, coordLimit };
        
        SkMatrix matrix;
        matrix.setRectToRect(bounds, limit, SkMatrix::kFill_ScaleToFit);

        path.transform(matrix, &devPath);
        matrix.mapRect(&devTarget, target);

        pathPtr = &devPath;
    } else {
        devTarget = target;
        pathPtr = &path;
    }

    SkIRect iTarget;
    devTarget.round(&iTarget);
    if (iTarget.isEmpty()) {
        iTarget.fLeft = SkScalarFloorToInt(devTarget.fLeft);
        iTarget.fTop = SkScalarFloorToInt(devTarget.fTop);
        iTarget.fRight = iTarget.fLeft + 1;
        iTarget.fBottom = iTarget.fTop + 1;
    }

    SkRegion clip(iTarget);
    SkRegion rgn;
    return rgn.setPath(*pathPtr, clip) ^ isInverse;
}

static void PathOpsSimplifyFailTest(skiatest::Reporter* reporter) {
    for (int index = 0; index < (int) (13 * nonFinitePtsCount * finitePtsCount); ++index) {
        SkPath path;
        int i = (int) (index % nonFinitePtsCount);
        int f = (int) (index % finitePtsCount);
        int g = (int) ((f + 1) % finitePtsCount);
        switch (index % 13) {
            case 0: path.lineTo(nonFinitePts[i]); break;
            case 1: path.quadTo(nonFinitePts[i], nonFinitePts[i]); break;
            case 2: path.quadTo(nonFinitePts[i], finitePts[f]); break;
            case 3: path.quadTo(finitePts[f], nonFinitePts[i]); break;
            case 4: path.cubicTo(nonFinitePts[i], finitePts[f], finitePts[f]); break;
            case 5: path.cubicTo(finitePts[f], nonFinitePts[i], finitePts[f]); break;
            case 6: path.cubicTo(finitePts[f], finitePts[f], nonFinitePts[i]); break;
            case 7: path.cubicTo(nonFinitePts[i], nonFinitePts[i], finitePts[f]); break;
            case 8: path.cubicTo(nonFinitePts[i], finitePts[f], nonFinitePts[i]); break;
            case 9: path.cubicTo(finitePts[f], nonFinitePts[i], nonFinitePts[i]); break;
            case 10: path.cubicTo(nonFinitePts[i], nonFinitePts[i], nonFinitePts[i]); break;
            case 11: path.cubicTo(nonFinitePts[i], finitePts[f], finitePts[g]); break;
            case 12: path.moveTo(nonFinitePts[i]); break;
        }
        SkPath result;
        result.setFillType(SkPath::kWinding_FillType);
        bool success = Simplify(path, &result);
        REPORTER_ASSERT(reporter, !success);
        REPORTER_ASSERT(reporter, result.isEmpty());
        REPORTER_ASSERT(reporter, result.getFillType() == SkPath::kWinding_FillType);
        reporter->bumpTestCount();
    }
    if (sizeof(reporter) == 4) {
        return;
    }
    for (int index = 0; index < (int) (11 * finitePtsCount); ++index) {
        SkPath path;
        int f = (int) (index % finitePtsCount);
        int g = (int) ((f + 1) % finitePtsCount);
        switch (index % 11) {
            case 0: path.lineTo(finitePts[f]); break;
            case 1: path.quadTo(finitePts[f], finitePts[f]); break;
            case 2: path.quadTo(finitePts[f], finitePts[g]); break;
            case 3: path.quadTo(finitePts[g], finitePts[f]); break;
            case 4: path.cubicTo(finitePts[f], finitePts[f], finitePts[f]); break;
            case 5: path.cubicTo(finitePts[f], finitePts[f], finitePts[g]); break;
            case 6: path.cubicTo(finitePts[f], finitePts[g], finitePts[f]); break;
            case 7: path.cubicTo(finitePts[f], finitePts[g], finitePts[g]); break;
            case 8: path.cubicTo(finitePts[g], finitePts[f], finitePts[f]); break;
            case 9: path.cubicTo(finitePts[g], finitePts[f], finitePts[g]); break;
            case 10: path.moveTo(finitePts[f]); break;
        }
        SkPath result;
        result.setFillType(SkPath::kWinding_FillType);
        bool success = Simplify(path, &result);
        REPORTER_ASSERT(reporter, success);
        REPORTER_ASSERT(reporter, result.getFillType() != SkPath::kWinding_FillType);
        reporter->bumpTestCount();
    }
}

static void toString(const SkPath& path, SkString* str) {
    if (path.isEmpty()) {
        str->append("path:empty");
    } else {
        toString(path.getBounds(), str);
#if 1
        SkString s;
        dumpVerbs(path, &s);
        str->append(s.c_str());
#endif
        str->append("]");
        str->prepend("path:[");
    }
}

// http://crbug.com/165432
// Limit extreme dash path effects to avoid exhausting the system memory.
static void test_crbug_165432(skiatest::Reporter* reporter) {
    SkPath path;
    path.moveTo(0, 0);
    path.lineTo(10000000, 0);

    SkScalar intervals[] = { 0.5f, 0.5f };
    SkDashPathEffect dash(intervals, 2, 0);

    SkPaint paint;
    paint.setStyle(SkPaint::kStroke_Style);
    paint.setPathEffect(&dash);

    SkPath filteredPath;
    SkStrokeRec rec(paint);
    REPORTER_ASSERT(reporter, !dash.filterPath(&filteredPath, path, &rec, NULL));
    REPORTER_ASSERT(reporter, filteredPath.isEmpty());
}

bool SkHitTestPathEx(const SkPath& path, SkScalar x, SkScalar y) {
    bool isInverse = path.isInverseFillType();
    if (path.isEmpty()) {
        return isInverse;
    }
    
    const SkRect& bounds = path.getBounds();
    if (!bounds.contains(x, y)) {
        return isInverse;
    }

    SkPath::Iter iter(path, true);
    bool done = false;
    int w = 0;
    do {
        SkPoint pts[4];
        switch (iter.next(pts, false)) {
            case SkPath::kMove_Verb:
            case SkPath::kClose_Verb:
                break;
            case SkPath::kLine_Verb:
                w += winding_line(pts, x, y);
                break;
            case SkPath::kQuad_Verb:
                w += winding_quad(pts, x, y);
                break;
            case SkPath::kCubic_Verb:
                w += winding_cubic(pts, x, y);
                break;
            case SkPath::kDone_Verb:
                done = true;
                break;
        }
    } while (!done);

    switch (path.getFillType()) {
        case SkPath::kEvenOdd_FillType:
        case SkPath::kInverseEvenOdd_FillType:
            w &= 1;
            break;
        default:
            break;
    }
    return SkToBool(w);
}

void GrGLPath::InitPathObjectPathData(GrGLGpu* gpu,
                                      GrGLuint pathID,
                                      const SkPath& skPath) {
    SkASSERT(!skPath.isEmpty());

#ifdef SK_SCALAR_IS_FLOAT
    // This branch does type punning, converting SkPoint* to GrGLfloat*.
    if ((skPath.getSegmentMasks() & SkPath::kConic_SegmentMask) == 0) {
        int verbCnt = skPath.countVerbs();
        int pointCnt = skPath.countPoints();
        int coordCnt = pointCnt * 2;
        SkSTArray<16, GrGLubyte, true> pathCommands(verbCnt);
        SkSTArray<16, GrGLfloat, true> pathCoords(coordCnt);

        static_assert(sizeof(SkPoint) == sizeof(GrGLfloat) * 2, "sk_point_not_two_floats");

        pathCommands.resize_back(verbCnt);
        pathCoords.resize_back(coordCnt);
        skPath.getPoints(reinterpret_cast<SkPoint*>(&pathCoords[0]), pointCnt);
        skPath.getVerbs(&pathCommands[0], verbCnt);

        SkDEBUGCODE(int verbCoordCnt = 0);
        for (int i = 0; i < verbCnt; ++i) {
            SkPath::Verb v = static_cast<SkPath::Verb>(pathCommands[i]);
            pathCommands[i] = verb_to_gl_path_cmd(v);
            SkDEBUGCODE(verbCoordCnt += num_coords(v));
        }
        SkASSERT(verbCnt == pathCommands.count());
        SkASSERT(verbCoordCnt == pathCoords.count());
        SkDEBUGCODE(verify_floats(&pathCoords[0], pathCoords.count()));
        GR_GL_CALL(gpu->glInterface(), PathCommands(pathID, pathCommands.count(), &pathCommands[0],
                                                    pathCoords.count(), GR_GL_FLOAT,
                                                    &pathCoords[0]));
        return;
    }
#endif
    SkAssertResult(init_path_object_for_general_path<false>(gpu, pathID, skPath));
}

bool GrAALinearizingConvexPathRenderer::onDrawPath(GrDrawTarget* target,
                                                   GrPipelineBuilder* pipelineBuilder,
                                                   GrColor color,
                                                   const SkMatrix& vm,
                                                   const SkPath& path,
                                                   const GrStrokeInfo& stroke,
                                                   bool antiAlias) {
    if (path.isEmpty()) {
        return true;
    }
    AAFlatteningConvexPathBatch::Geometry geometry;
    geometry.fColor = color;
    geometry.fViewMatrix = vm;
    geometry.fPath = path;
    geometry.fStrokeWidth = stroke.isFillStyle() ? -1.0f : stroke.getWidth();
    geometry.fJoin = stroke.isFillStyle() ? SkPaint::Join::kMiter_Join : stroke.getJoin();
    geometry.fMiterLimit = stroke.getMiter();

    SkAutoTUnref<GrBatch> batch(AAFlatteningConvexPathBatch::Create(geometry));
    target->drawBatch(pipelineBuilder, batch);

    return true;
}

DEF_TEST(PathOpsBuilder, reporter) {
    SkOpBuilder builder;
    SkPath result;
    REPORTER_ASSERT(reporter, builder.resolve(&result));
    REPORTER_ASSERT(reporter, result.isEmpty());

    builder.add(result, kDifference_SkPathOp);
    REPORTER_ASSERT(reporter, builder.resolve(&result));
    REPORTER_ASSERT(reporter, result.isEmpty());

    builder.add(result, kUnion_SkPathOp);
    REPORTER_ASSERT(reporter, builder.resolve(&result));
    REPORTER_ASSERT(reporter, result.isEmpty());

    SkPath rectPath;
    rectPath.setFillType(SkPath::kEvenOdd_FillType);
    rectPath.addRect(0, 1, 2, 3, SkPath::kCW_Direction);
    builder.add(rectPath, kUnion_SkPathOp);
    REPORTER_ASSERT(reporter, builder.resolve(&result));
    bool closed;
    SkPath::Direction dir;
    REPORTER_ASSERT(reporter, result.isRect(nullptr, &closed, &dir));
    REPORTER_ASSERT(reporter, closed);
    REPORTER_ASSERT(reporter, dir == SkPath::kCCW_Direction);
    int pixelDiff = comparePaths(reporter, __FUNCTION__, rectPath, result);
    REPORTER_ASSERT(reporter, pixelDiff == 0);

    rectPath.reset();
    rectPath.setFillType(SkPath::kEvenOdd_FillType);
    rectPath.addRect(0, 1, 2, 3, SkPath::kCCW_Direction);
    builder.add(rectPath, kUnion_SkPathOp);
    REPORTER_ASSERT(reporter, builder.resolve(&result));
    REPORTER_ASSERT(reporter, result.isRect(nullptr, &closed, &dir));
    REPORTER_ASSERT(reporter, closed);
    REPORTER_ASSERT(reporter, dir == SkPath::kCCW_Direction);
    REPORTER_ASSERT(reporter, rectPath == result);

    builder.add(rectPath, kDifference_SkPathOp);
    REPORTER_ASSERT(reporter, builder.resolve(&result));
    REPORTER_ASSERT(reporter, result.isEmpty());

    SkPath rect2, rect3;
    rect2.addRect(2, 1, 4, 3, SkPath::kCW_Direction);
    rect3.addRect(4, 1, 5, 3, SkPath::kCCW_Direction);
    builder.add(rectPath, kUnion_SkPathOp);
    builder.add(rect2, kUnion_SkPathOp);
    builder.add(rect3, kUnion_SkPathOp);
    REPORTER_ASSERT(reporter, builder.resolve(&result));
    REPORTER_ASSERT(reporter, result.isRect(nullptr, &closed, &dir));
    REPORTER_ASSERT(reporter, closed);
    SkRect expected;
    expected.set(0, 1, 5, 3);
    REPORTER_ASSERT(reporter, result.getBounds() == expected);

    SkPath circle1, circle2, circle3;
    circle1.addCircle(5, 6, 4, SkPath::kCW_Direction);
    circle2.addCircle(7, 4, 8, SkPath::kCCW_Direction);
    circle3.addCircle(6, 5, 6, SkPath::kCW_Direction);
    SkPath opCompare;
    Op(circle1, circle2, kUnion_SkPathOp, &opCompare);
    Op(opCompare, circle3, kDifference_SkPathOp, &opCompare);
    builder.add(circle1, kUnion_SkPathOp);
    builder.add(circle2, kUnion_SkPathOp);
    builder.add(circle3, kDifference_SkPathOp);
    REPORTER_ASSERT(reporter, builder.resolve(&result));
    pixelDiff = comparePaths(reporter, __FUNCTION__, opCompare, result);
    REPORTER_ASSERT(reporter, pixelDiff == 0);
}