コード例 #1
0
ファイル: SkGeometry.cpp プロジェクト: venkatarajasekhar/Qt
int SkChopQuadAtMaxCurvature(const SkPoint src[3], SkPoint dst[5]) {
    SkScalar t = SkFindQuadMaxCurvature(src);
    if (t == 0) {
        memcpy(dst, src, 3 * sizeof(SkPoint));
        return 1;
    } else {
        SkChopQuadAt(src, dst, t);
        return 2;
    }
}
コード例 #2
0
ファイル: SkPathMeasure.cpp プロジェクト: geekygenius/skia
static SkScalar quad_folded_len(const SkPoint pts[3]) {
    SkScalar t = SkFindQuadMaxCurvature(pts);
    SkPoint pt = SkEvalQuadAt(pts, t);
    SkVector a = pts[2] - pt;
    SkScalar result = a.length();
    if (0 != t) {
        SkVector b = pts[0] - pt;
        result += b.length();
    }
    SkASSERT(SkScalarIsFinite(result));
    return result;
}
コード例 #3
0
// Uses the max curvature function for quads to estimate
// where to chop the conic. If the max curvature is not
// found along the curve segment it will return 1 and
// dst[0] is the original conic. If it returns 2 the dst[0]
// and dst[1] are the two new conics.
static int split_conic(const SkPoint src[3], SkConic dst[2], const SkScalar weight) {
    SkScalar t = SkFindQuadMaxCurvature(src);
    if (t == 0) {
        if (dst) {
            dst[0].set(src, weight);
        }
        return 1;
    } else {
        if (dst) {
            SkConic conic;
            conic.set(src, weight);
            conic.chopAt(t, dst);
        }
        return 2;
    }
}
コード例 #4
0
bool SkOpEdgeBuilder::walk() {
    uint8_t* verbPtr = fPathVerbs.begin();
    uint8_t* endOfFirstHalf = &verbPtr[fSecondHalf];
    SkPoint* pointsPtr = fPathPts.begin() - 1;
    SkScalar* weightPtr = fWeights.begin();
    SkPath::Verb verb;
    while ((verb = (SkPath::Verb) *verbPtr) != SkPath::kDone_Verb) {
        if (verbPtr == endOfFirstHalf) {
            fOperand = true;
        }
        verbPtr++;
        switch (verb) {
            case SkPath::kMove_Verb:
                if (fCurrentContour && fCurrentContour->count()) {
                    if (fAllowOpenContours) {
                        complete();
                    } else if (!close()) {
                        return false;
                    }
                }
                if (!fCurrentContour) {
                    fCurrentContour = fContoursHead->appendContour();
                }
                fCurrentContour->init(fGlobalState, fOperand,
                    fXorMask[fOperand] == kEvenOdd_PathOpsMask);
                pointsPtr += 1;
                continue;
            case SkPath::kLine_Verb:
                fCurrentContour->addLine(pointsPtr);
                break;
            case SkPath::kQuad_Verb:
                {
                    SkVector v1 = pointsPtr[1] - pointsPtr[0];
                    SkVector v2 = pointsPtr[2] - pointsPtr[1];
                    if (v1.dot(v2) < 0) {
                        SkPoint pair[5];
                        if (SkChopQuadAtMaxCurvature(pointsPtr, pair) == 1) {
                            goto addOneQuad;
                        }
                        if (!SkScalarsAreFinite(&pair[0].fX, SK_ARRAY_COUNT(pair) * 2)) {
                            return false;
                        }
                        SkPoint cStorage[2][2];
                        SkPath::Verb v1 = SkReduceOrder::Quad(&pair[0], cStorage[0]);
                        SkPath::Verb v2 = SkReduceOrder::Quad(&pair[2], cStorage[1]);
                        SkPoint* curve1 = v1 != SkPath::kLine_Verb ? &pair[0] : cStorage[0];
                        SkPoint* curve2 = v2 != SkPath::kLine_Verb ? &pair[2] : cStorage[1];
                        if (can_add_curve(v1, curve1) && can_add_curve(v2, curve2)) {
                            fCurrentContour->addCurve(v1, curve1);
                            fCurrentContour->addCurve(v2, curve2);
                            break;
                        }
                    }
                }
            addOneQuad:
                fCurrentContour->addQuad(pointsPtr);
                break;
            case SkPath::kConic_Verb: {
                SkVector v1 = pointsPtr[1] - pointsPtr[0];
                SkVector v2 = pointsPtr[2] - pointsPtr[1];
                SkScalar weight = *weightPtr++;
                if (v1.dot(v2) < 0) {
                    // FIXME: max curvature for conics hasn't been implemented; use placeholder
                    SkScalar maxCurvature = SkFindQuadMaxCurvature(pointsPtr);
                    if (maxCurvature > 0) {
                        SkConic conic(pointsPtr, weight);
                        SkConic pair[2];
                        if (!conic.chopAt(maxCurvature, pair)) {
                            // if result can't be computed, use original
                            fCurrentContour->addConic(pointsPtr, weight);
                            break;
                        }
                        SkPoint cStorage[2][3];
                        SkPath::Verb v1 = SkReduceOrder::Conic(pair[0], cStorage[0]);
                        SkPath::Verb v2 = SkReduceOrder::Conic(pair[1], cStorage[1]);
                        SkPoint* curve1 = v1 != SkPath::kLine_Verb ? pair[0].fPts : cStorage[0];
                        SkPoint* curve2 = v2 != SkPath::kLine_Verb ? pair[1].fPts : cStorage[1];
                        if (can_add_curve(v1, curve1) && can_add_curve(v2, curve2)) {
                            fCurrentContour->addCurve(v1, curve1, pair[0].fW);
                            fCurrentContour->addCurve(v2, curve2, pair[1].fW);
                            break;
                        }
                    }
                }
                fCurrentContour->addConic(pointsPtr, weight);
                } break;
            case SkPath::kCubic_Verb:
                {
                    // Split complex cubics (such as self-intersecting curves or
                    // ones with difficult curvature) in two before proceeding.
                    // This can be required for intersection to succeed.
                    SkScalar splitT;
                    if (SkDCubic::ComplexBreak(pointsPtr, &splitT)) {
                        SkPoint pair[7];
                        SkChopCubicAt(pointsPtr, pair, splitT);
                        if (!SkScalarsAreFinite(&pair[0].fX, SK_ARRAY_COUNT(pair) * 2)) {
                            return false;
                        }
                        SkPoint cStorage[2][4];
                        SkPath::Verb v1 = SkReduceOrder::Cubic(&pair[0], cStorage[0]);
                        SkPath::Verb v2 = SkReduceOrder::Cubic(&pair[3], cStorage[1]);
                        SkPoint* curve1 = v1 == SkPath::kCubic_Verb ? &pair[0] : cStorage[0];
                        SkPoint* curve2 = v2 == SkPath::kCubic_Verb ? &pair[3] : cStorage[1];
                        if (can_add_curve(v1, curve1) && can_add_curve(v2, curve2)) {
                            fCurrentContour->addCurve(v1, curve1);
                            fCurrentContour->addCurve(v2, curve2);
                            break;
                        } 
                    }
                }
                fCurrentContour->addCubic(pointsPtr);
                break;
            case SkPath::kClose_Verb:
                SkASSERT(fCurrentContour);
                if (!close()) {
                    return false;
                }
                continue;
            default:
                SkDEBUGFAIL("bad verb");
                return false;
        }
        SkASSERT(fCurrentContour);
        fCurrentContour->debugValidate();
        pointsPtr += SkPathOpsVerbToPoints(verb);
    }
   if (fCurrentContour && fCurrentContour->count() &&!fAllowOpenContours && !close()) {
       return false;
   }
   return true;
}
コード例 #5
0
ファイル: SkOpEdgeBuilder.cpp プロジェクト: molikto/Skia
bool SkOpEdgeBuilder::walk() {
    uint8_t* verbPtr = fPathVerbs.begin();
    uint8_t* endOfFirstHalf = &verbPtr[fSecondHalf];
    SkPoint* pointsPtr = fPathPts.begin() - 1;
    SkScalar* weightPtr = fWeights.begin();
    SkPath::Verb verb;
    SkOpContour* contour = fContourBuilder.contour();
    while ((verb = (SkPath::Verb) *verbPtr) != SkPath::kDone_Verb) {
        if (verbPtr == endOfFirstHalf) {
            fOperand = true;
        }
        verbPtr++;
        switch (verb) {
            case SkPath::kMove_Verb:
                if (contour && contour->count()) {
                    if (fAllowOpenContours) {
                        complete();
                    } else if (!close()) {
                        return false;
                    }
                }
                if (!contour) {
                    fContourBuilder.setContour(contour = fContoursHead->appendContour());
                }
                contour->init(fGlobalState, fOperand,
                    fXorMask[fOperand] == kEvenOdd_PathOpsMask);
                pointsPtr += 1;
                continue;
            case SkPath::kLine_Verb:
                fContourBuilder.addLine(pointsPtr);
                break;
            case SkPath::kQuad_Verb:
                {
                    SkVector v1 = pointsPtr[1] - pointsPtr[0];
                    SkVector v2 = pointsPtr[2] - pointsPtr[1];
                    if (v1.dot(v2) < 0) {
                        SkPoint pair[5];
                        if (SkChopQuadAtMaxCurvature(pointsPtr, pair) == 1) {
                            goto addOneQuad;
                        }
                        if (!SkScalarsAreFinite(&pair[0].fX, SK_ARRAY_COUNT(pair) * 2)) {
                            return false;
                        }
                        for (unsigned index = 0; index < SK_ARRAY_COUNT(pair); ++index) {
                            force_small_to_zero(&pair[index]);
                        }
                        SkPoint cStorage[2][2];
                        SkPath::Verb v1 = SkReduceOrder::Quad(&pair[0], cStorage[0]);
                        SkPath::Verb v2 = SkReduceOrder::Quad(&pair[2], cStorage[1]);
                        SkPoint* curve1 = v1 != SkPath::kLine_Verb ? &pair[0] : cStorage[0];
                        SkPoint* curve2 = v2 != SkPath::kLine_Verb ? &pair[2] : cStorage[1];
                        if (can_add_curve(v1, curve1) && can_add_curve(v2, curve2)) {
                            fContourBuilder.addCurve(v1, curve1);
                            fContourBuilder.addCurve(v2, curve2);
                            break;
                        }
                    }
                }
            addOneQuad:
                fContourBuilder.addQuad(pointsPtr);
                break;
            case SkPath::kConic_Verb: {
                SkVector v1 = pointsPtr[1] - pointsPtr[0];
                SkVector v2 = pointsPtr[2] - pointsPtr[1];
                SkScalar weight = *weightPtr++;
                if (v1.dot(v2) < 0) {
                    // FIXME: max curvature for conics hasn't been implemented; use placeholder
                    SkScalar maxCurvature = SkFindQuadMaxCurvature(pointsPtr);
                    if (maxCurvature > 0) {
                        SkConic conic(pointsPtr, weight);
                        SkConic pair[2];
                        if (!conic.chopAt(maxCurvature, pair)) {
                            // if result can't be computed, use original
                            fContourBuilder.addConic(pointsPtr, weight);
                            break;
                        }
                        SkPoint cStorage[2][3];
                        SkPath::Verb v1 = SkReduceOrder::Conic(pair[0], cStorage[0]);
                        SkPath::Verb v2 = SkReduceOrder::Conic(pair[1], cStorage[1]);
                        SkPoint* curve1 = v1 != SkPath::kLine_Verb ? pair[0].fPts : cStorage[0];
                        SkPoint* curve2 = v2 != SkPath::kLine_Verb ? pair[1].fPts : cStorage[1];
                        if (can_add_curve(v1, curve1) && can_add_curve(v2, curve2)) {
                            fContourBuilder.addCurve(v1, curve1, pair[0].fW);
                            fContourBuilder.addCurve(v2, curve2, pair[1].fW);
                            break;
                        }
                    }
                }
                fContourBuilder.addConic(pointsPtr, weight);
                } break;
            case SkPath::kCubic_Verb:
                {
                    // Split complex cubics (such as self-intersecting curves or
                    // ones with difficult curvature) in two before proceeding.
                    // This can be required for intersection to succeed.
                    SkScalar splitT[3];
                    int breaks = SkDCubic::ComplexBreak(pointsPtr, splitT);
                    if (!breaks) {
                        fContourBuilder.addCubic(pointsPtr);
                        break;
                    }
                    SkASSERT(breaks <= (int) SK_ARRAY_COUNT(splitT));
                    struct Splitsville {
                        double fT[2];
                        SkPoint fPts[4];
                        SkPoint fReduced[4];
                        SkPath::Verb fVerb;
                        bool fCanAdd;
                    } splits[4];
                    SkASSERT(SK_ARRAY_COUNT(splits) == SK_ARRAY_COUNT(splitT) + 1);
                    SkTQSort(splitT, &splitT[breaks - 1]);
                    for (int index = 0; index <= breaks; ++index) {
                        Splitsville* split = &splits[index];
                        split->fT[0] = index ? splitT[index - 1] : 0;
                        split->fT[1] = index < breaks ? splitT[index] : 1;
                        SkDCubic part = SkDCubic::SubDivide(pointsPtr, split->fT[0], split->fT[1]);
                        if (!part.toFloatPoints(split->fPts)) {
                            return false;
                        }
                        split->fVerb = SkReduceOrder::Cubic(split->fPts, split->fReduced);
                        SkPoint* curve = SkPath::kCubic_Verb == verb
                                ? split->fPts : split->fReduced;
                        split->fCanAdd = can_add_curve(split->fVerb, curve);
                    }
                    for (int index = 0; index <= breaks; ++index) {
                        Splitsville* split = &splits[index];
                        if (!split->fCanAdd) {
                            continue;
                        }
                        int prior = index;
                        while (prior > 0 && !splits[prior - 1].fCanAdd) {
                            --prior;
                        }
                        if (prior < index) {
                            split->fT[0] = splits[prior].fT[0];
                            split->fPts[0] = splits[prior].fPts[0];
                        }
                        int next = index;
                        int breakLimit = SkTMin(breaks, (int) SK_ARRAY_COUNT(splits) - 1);
                        while (next < breakLimit && !splits[next + 1].fCanAdd) {
                            ++next;
                        }
                        if (next > index) {
                            split->fT[1] = splits[next].fT[1];
                            split->fPts[3] = splits[next].fPts[3];
                        }
                        if (prior < index || next > index) {
                            split->fVerb = SkReduceOrder::Cubic(split->fPts, split->fReduced);
                        }
                        SkPoint* curve = SkPath::kCubic_Verb == split->fVerb
                                ? split->fPts : split->fReduced;
                        if (!can_add_curve(split->fVerb, curve)) {
                            return false;
                        }
                        fContourBuilder.addCurve(split->fVerb, curve);
                    }
                }
                break;
            case SkPath::kClose_Verb:
                SkASSERT(contour);
                if (!close()) {
                    return false;
                }
                contour = nullptr;
                continue;
            default:
                SkDEBUGFAIL("bad verb");
                return false;
        }
        SkASSERT(contour);
        if (contour->count()) {
            contour->debugValidate();
        }
        pointsPtr += SkPathOpsVerbToPoints(verb);
    }
    fContourBuilder.flush();
    if (contour && contour->count() &&!fAllowOpenContours && !close()) {
        return false;
    }
    return true;
}