C++ SkPath::getSegmentMasks方法代码示例

bool GrStrokePathRenderer::canDrawPath(const SkPath& path,
                                       const SkStrokeRec& stroke,
                                       const GrDrawTarget* target,
                                       bool antiAlias) const {
    // FIXME : put the proper condition once GrDrawTarget::isOpaque is implemented
    const bool isOpaque = true; // target->isOpaque();

    // FIXME : remove this requirement once we have AA circles and implement the
    //         circle joins/caps appropriately in the ::onDrawPath() function.
    const bool requiresAACircle = (stroke.getCap()  == SkPaint::kRound_Cap) ||
                                  (stroke.getJoin() == SkPaint::kRound_Join);

    // Indices being stored in uint16, we don't want to overflow the indices capacity
    static const int maxVBSize = 1 << 16;
    const int maxNbVerts = (path.countPoints() + 1) * 5;

    // Check that the path contains no curved lines, only straight lines
    static const uint32_t unsupportedMask = SkPath::kQuad_SegmentMask | SkPath::kCubic_SegmentMask;

    // Must not be filled nor hairline nor semi-transparent
    // Note : May require a check to path.isConvex() if AA is supported
    return ((stroke.getStyle() == SkStrokeRec::kStroke_Style) && (maxNbVerts < maxVBSize) &&
            !path.isInverseFillType() && isOpaque && !requiresAACircle && !antiAlias &&
            ((path.getSegmentMasks() & unsupportedMask) == 0));
}

bool GrDefaultPathRenderer::canDrawPath(const SkPath& path,
                                        const SkStrokeRec& stroke,
                                        const GrDrawTarget* target,
                                        bool antiAlias) const {
    // this class can draw any path with any fill but doesn't do any anti-aliasing.

    return !antiAlias && !(SkPath::kConic_SegmentMask & path.getSegmentMasks()) &&
        (stroke.isFillStyle() ||
         IsStrokeHairlineOrEquivalent(stroke, target->getDrawState().getViewMatrix(), NULL));
}

bool GrAAHairLinePathRenderer::canDrawPath(const GrDrawTarget::Caps& targetCaps,
                                           const SkPath& path,
                                           GrPathFill fill,
                                           bool antiAlias) const {
    static const uint32_t gReqDerivMask = SkPath::kCubic_SegmentMask |
                                          SkPath::kQuad_SegmentMask;
    return (kHairLine_PathFill == fill &&
            antiAlias &&
            (targetCaps.fShaderDerivativeSupport ||
             !(gReqDerivMask & path.getSegmentMasks())));
}

bool GrAAHairLinePathRenderer::canDrawPath(const SkPath& path,
                                           const SkStrokeRec& stroke,
                                           const GrDrawTarget* target,
                                           bool antiAlias) const {
    if (!stroke.isHairlineStyle() || !antiAlias) {
        return false;
    }

    static const uint32_t gReqDerivMask = SkPath::kCubic_SegmentMask |
                                          SkPath::kQuad_SegmentMask;
    if (!target->getCaps().shaderDerivativeSupport() &&
        (gReqDerivMask & path.getSegmentMasks())) {
        return false;
    }
    return true;
}

bool GrAAHairLinePathRenderer::canDrawPath(const SkPath& path,
                                           GrPathFill fill,
                                           const GrDrawTarget* target,
                                           bool antiAlias) const {
    if (fill != kHairLine_GrPathFill || !antiAlias) {
        return false;
    }

    static const uint32_t gReqDerivMask = SkPath::kCubic_SegmentMask |
                                          SkPath::kQuad_SegmentMask;
    if (!target->getCaps().fShaderDerivativeSupport &&
        (gReqDerivMask & path.getSegmentMasks())) {
        return false;
    }
    return true;
}

bool GrAAHairLinePathRenderer::canDrawPath(const GrDrawTarget* target,
                                           const GrPipelineBuilder* pipelineBuilder,
                                           const SkMatrix& viewMatrix,
                                           const SkPath& path,
                                           const GrStrokeInfo& stroke,
                                           bool antiAlias) const {
    if (!antiAlias) {
        return false;
    }

    if (!IsStrokeHairlineOrEquivalent(stroke, viewMatrix, NULL)) {
        return false;
    }

    if (SkPath::kLine_SegmentMask == path.getSegmentMasks() ||
        target->caps()->shaderCaps()->shaderDerivativeSupport()) {
        return true;
    }
    return false;
}

bool GrAAHairLinePathRenderer::canDrawPath(const SkPath& path,
                                           const SkStrokeRec& stroke,
                                           const GrDrawTarget* target,
                                           bool antiAlias) const {
    if (!antiAlias) {
        return false;
    }

    if (!IsStrokeHairlineOrEquivalent(stroke,
                                      target->getDrawState().getViewMatrix(),
                                      NULL)) {
        return false;
    }

    if (SkPath::kLine_SegmentMask == path.getSegmentMasks() ||
        target->caps()->shaderDerivativeSupport()) {
        return true;
    }
    return false;
}

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));
}

void GrGLPath::InitPathObject(GrGLGpu* gpu,
                              GrGLuint pathID,
                              const SkPath& skPath,
                              const GrStrokeInfo& stroke) {
    SkASSERT(!stroke.isDashed());
    if (!skPath.isEmpty()) {
        int verbCnt = skPath.countVerbs();
        int pointCnt = skPath.countPoints();
        int minCoordCnt = pointCnt * 2;

        SkSTArray<16, GrGLubyte, true> pathCommands(verbCnt);
        SkSTArray<16, GrGLfloat, true> pathCoords(minCoordCnt);

        SkDEBUGCODE(int numCoords = 0);

        if ((skPath.getSegmentMasks() & SkPath::kConic_SegmentMask) == 0) {
            // This branch does type punning, converting SkPoint* to GrGLfloat*.
            SK_COMPILE_ASSERT(sizeof(SkPoint) == sizeof(GrGLfloat) * 2, sk_point_not_two_floats);
            // This branch does not convert with SkScalarToFloat.
#ifndef SK_SCALAR_IS_FLOAT
#error Need SK_SCALAR_IS_FLOAT.
#endif
            pathCommands.resize_back(verbCnt);
            pathCoords.resize_back(minCoordCnt);
            skPath.getPoints(reinterpret_cast<SkPoint*>(&pathCoords[0]), pointCnt);
            skPath.getVerbs(&pathCommands[0], verbCnt);
            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(numCoords += num_coords(v));
            }
        } else {
            SkPoint points[4];
            SkPath::RawIter iter(skPath);
            SkPath::Verb verb;
            while ((verb = iter.next(points)) != SkPath::kDone_Verb) {
                pathCommands.push_back(verb_to_gl_path_cmd(verb));
                GrGLfloat coords[6];
                int coordsForVerb;
                switch (verb) {
                    case SkPath::kMove_Verb:
                        points_to_coords(points, 0, 1, coords);
                        coordsForVerb = 2;
                        break;
                    case SkPath::kLine_Verb:
                        points_to_coords(points, 1, 1, coords);
                        coordsForVerb = 2;
                        break;
                    case SkPath::kConic_Verb:
                        points_to_coords(points, 1, 2, coords);
                        coords[4] = SkScalarToFloat(iter.conicWeight());
                        coordsForVerb = 5;
                        break;
                    case SkPath::kQuad_Verb:
                        points_to_coords(points, 1, 2, coords);
                        coordsForVerb = 4;
                        break;
                    case SkPath::kCubic_Verb:
                        points_to_coords(points, 1, 3, coords);
                        coordsForVerb = 6;
                        break;
                    case SkPath::kClose_Verb:
                        continue;
                    default:
                        SkASSERT(false);  // Not reached.
                        continue;
                }
                SkDEBUGCODE(numCoords += num_coords(verb));
                pathCoords.push_back_n(coordsForVerb, coords);
            }
        }

        SkASSERT(verbCnt == pathCommands.count());
        SkASSERT(numCoords == pathCoords.count());

        GR_GL_CALL(gpu->glInterface(), PathCommands(pathID, pathCommands.count(), &pathCommands[0],
                   pathCoords.count(), GR_GL_FLOAT, &pathCoords[0]));
    } else {
        GR_GL_CALL(gpu->glInterface(), PathCommands(pathID, 0, NULL, 0, GR_GL_FLOAT, NULL));
    }

    if (stroke.needToApply()) {
        SkASSERT(!stroke.isHairlineStyle());
        GR_GL_CALL(gpu->glInterface(),
            PathParameterf(pathID, GR_GL_PATH_STROKE_WIDTH, SkScalarToFloat(stroke.getWidth())));
        GR_GL_CALL(gpu->glInterface(),
            PathParameterf(pathID, GR_GL_PATH_MITER_LIMIT, SkScalarToFloat(stroke.getMiter())));
        GrGLenum join = join_to_gl_join(stroke.getJoin());
        GR_GL_CALL(gpu->glInterface(), PathParameteri(pathID, GR_GL_PATH_JOIN_STYLE, join));
        GrGLenum cap = cap_to_gl_cap(stroke.getCap());
        GR_GL_CALL(gpu->glInterface(), PathParameteri(pathID, GR_GL_PATH_END_CAPS, cap));
        GR_GL_CALL(gpu->glInterface(), PathParameterf(pathID, GR_GL_PATH_STROKE_BOUND, 0.02f));
    }
}