C++ SkStrokeRec::getWidth方法代码示例

/**
 * Draw a single path element of the clip stack into the accumulation bitmap
 */
void GrSWMaskHelper::draw(const SkPath& path, const SkStrokeRec& stroke, SkRegion::Op op,
                          bool antiAlias, uint8_t alpha) {

    SkPaint paint;
    if (stroke.isHairlineStyle()) {
        paint.setStyle(SkPaint::kStroke_Style);
        paint.setStrokeWidth(SK_Scalar1);
    } else {
        if (stroke.isFillStyle()) {
            paint.setStyle(SkPaint::kFill_Style);
        } else {
            paint.setStyle(SkPaint::kStroke_Style);
            paint.setStrokeJoin(stroke.getJoin());
            paint.setStrokeCap(stroke.getCap());
            paint.setStrokeWidth(stroke.getWidth());
        }
    }
    paint.setAntiAlias(antiAlias);

    if (SkRegion::kReplace_Op == op && 0xFF == alpha) {
        SkASSERT(0xFF == paint.getAlpha());
        fDraw.drawPathCoverage(path, paint);
    } else {
        paint.setXfermodeMode(op_to_mode(op));
        paint.setColor(SkColorSetARGB(alpha, alpha, alpha, alpha));
        fDraw.drawPath(path, paint);
    }
}

uint64_t GrPath::ComputeStrokeKey(const SkStrokeRec& stroke) {
    enum {
        kStyleBits = 2,
        kJoinBits = 2,
        kCapBits = 2,
        kWidthBits = 29,
        kMiterBits = 29,

        kJoinShift = kStyleBits,
        kCapShift = kJoinShift + kJoinBits,
        kWidthShift = kCapShift + kCapBits,
        kMiterShift = kWidthShift + kWidthBits,

        kBitCount = kMiterShift + kMiterBits
    };

    SK_COMPILE_ASSERT(SkStrokeRec::kStyleCount <= (1 << kStyleBits), style_shift_will_be_wrong);
    SK_COMPILE_ASSERT(SkPaint::kJoinCount <= (1 << kJoinBits), cap_shift_will_be_wrong);
    SK_COMPILE_ASSERT(SkPaint::kCapCount <= (1 << kCapBits), miter_shift_will_be_wrong);
    SK_COMPILE_ASSERT(kBitCount == 64, wrong_stroke_key_size);

    if (!stroke.needToApply()) {
        return SkStrokeRec::kFill_Style;
    }

    uint64_t key = stroke.getStyle();
    key |= stroke.getJoin() << kJoinShift;
    key |= stroke.getCap() << kCapShift;
    key |= get_top_n_float_bits<kWidthBits>(stroke.getWidth()) << kWidthShift;
    key |= get_top_n_float_bits<kMiterBits>(stroke.getMiter()) << kMiterShift;

    return key;
}

    static std::unique_ptr<GrLegacyMeshDrawOp> Make(GrColor color, const SkMatrix& viewMatrix,
                                                    const SkRect& rect, const SkStrokeRec& stroke,
                                                    bool snapToPixelCenters) {
        if (!allowed_stroke(stroke)) {
            return nullptr;
        }
        NonAAStrokeRectOp* op = new NonAAStrokeRectOp();
        op->fColor = color;
        op->fViewMatrix = viewMatrix;
        op->fRect = rect;
        // Sort the rect for hairlines
        op->fRect.sort();
        op->fStrokeWidth = stroke.getWidth();

        SkScalar rad = SkScalarHalf(op->fStrokeWidth);
        SkRect bounds = rect;
        bounds.outset(rad, rad);

        // If our caller snaps to pixel centers then we have to round out the bounds
        if (snapToPixelCenters) {
            viewMatrix.mapRect(&bounds);
            // We want to be consistent with how we snap non-aa lines. To match what we do in
            // GrGLSLVertexShaderBuilder, we first floor all the vertex values and then add half a
            // pixel to force us to pixel centers.
            bounds.set(SkScalarFloorToScalar(bounds.fLeft),
                       SkScalarFloorToScalar(bounds.fTop),
                       SkScalarFloorToScalar(bounds.fRight),
                       SkScalarFloorToScalar(bounds.fBottom));
            bounds.offset(0.5f, 0.5f);
            op->setBounds(bounds, HasAABloat::kNo, IsZeroArea::kNo);
        } else {
            op->setTransformedBounds(bounds, op->fViewMatrix, HasAABloat::kNo, IsZeroArea::kNo);
        }
        return std::unique_ptr<GrLegacyMeshDrawOp>(op);
    }

inline static bool is_miter(const SkStrokeRec& stroke) {
    // For hairlines, make bevel and round joins appear the same as mitered ones.
    // small miter limit means right angles show bevel...
    if ((stroke.getWidth() > 0) && (stroke.getJoin() != SkPaint::kMiter_Join ||
                                    stroke.getMiter() < SK_ScalarSqrt2)) {
        return false;
    }
    return true;
}

static void outset_for_stroke(SkRect* rect, const SkStrokeRec& rec) {
    SkScalar radius = SkScalarHalf(rec.getWidth());
    if (0 == radius) {
        radius = SK_Scalar1;    // hairlines
    }
    if (SkPaint::kMiter_Join == rec.getJoin()) {
        radius = SkScalarMul(radius, rec.getMiter());
    }
    rect->outset(radius, radius);
}

bool Append(GrBatch* origBatch,
            GrColor color,
            const SkMatrix& viewMatrix,
            const SkRect& rect,
            const SkStrokeRec& stroke) {
    AAStrokeRectBatch* batch = origBatch->cast<AAStrokeRectBatch>();

    // we can't batch across vm changes
    bool isMiterStroke = is_miter(stroke);
    if (!batch->canAppend(viewMatrix, isMiterStroke)) {
        return false;
    }

    SkRect devOutside, devOutsideAssist, devInside;
    bool isDegenerate;
    compute_rects(&devOutside, &devOutsideAssist, &devInside, &isDegenerate, viewMatrix,
                  rect, stroke.getWidth(), isMiterStroke);

    batch->appendAndUpdateBounds(color, devOutside, devOutsideAssist, devInside, isDegenerate);
    return true;
}

/**
 * Draw a single path element of the clip stack into the accumulation bitmap
 */
void GrSWMaskHelper::draw(const SkPath& path, const SkStrokeRec& stroke, SkRegion::Op op,
                          bool antiAlias, uint8_t alpha) {

    SkPaint paint;
    if (stroke.isHairlineStyle()) {
        paint.setStyle(SkPaint::kStroke_Style);
        paint.setStrokeWidth(SK_Scalar1);
    } else {
        if (stroke.isFillStyle()) {
            paint.setStyle(SkPaint::kFill_Style);
        } else {
            paint.setStyle(SkPaint::kStroke_Style);
            paint.setStrokeJoin(stroke.getJoin());
            paint.setStrokeCap(stroke.getCap());
            paint.setStrokeWidth(stroke.getWidth());
        }
    }
    paint.setAntiAlias(antiAlias);

    SkTBlitterAllocator allocator;
    SkBlitter* blitter = nullptr;
    if (kBlitter_CompressionMode == fCompressionMode) {
        SkASSERT(fCompressedBuffer.get());
        blitter = SkTextureCompressor::CreateBlitterForFormat(
            fPixels.width(), fPixels.height(), fCompressedBuffer.get(), &allocator,
                                                              fCompressedFormat);
    }

    if (SkRegion::kReplace_Op == op && 0xFF == alpha) {
        SkASSERT(0xFF == paint.getAlpha());
        fDraw.drawPathCoverage(path, paint, blitter);
    } else {
        paint.setXfermodeMode(op_to_mode(op));
        paint.setColor(SkColorSetARGB(alpha, alpha, alpha, alpha));
        fDraw.drawPath(path, paint, blitter);
    }
}

// Currently asPoints is more restrictive then it needs to be. In the future
// we need to:
//      allow kRound_Cap capping (could allow rotations in the matrix with this)
//      allow paths to be returned
bool SkDashPathEffect::asPoints(PointData* results,
                                const SkPath& src,
                                const SkStrokeRec& rec,
                                const SkMatrix& matrix,
                                const SkRect* cullRect) const {
    // width < 0 -> fill && width == 0 -> hairline so requiring width > 0 rules both out
    if (fInitialDashLength < 0 || 0 >= rec.getWidth()) {
        return false;
    }

    // TODO: this next test could be eased up. We could allow any number of
    // intervals as long as all the ons match and all the offs match.
    // Additionally, they do not necessarily need to be integers.
    // We cannot allow arbitrary intervals since we want the returned points
    // to be uniformly sized.
    if (fCount != 2 ||
        !SkScalarNearlyEqual(fIntervals[0], fIntervals[1]) ||
        !SkScalarIsInt(fIntervals[0]) ||
        !SkScalarIsInt(fIntervals[1])) {
        return false;
    }

    SkPoint pts[2];

    if (!src.isLine(pts)) {
        return false;
    }

    // TODO: this test could be eased up to allow circles
    if (SkPaint::kButt_Cap != rec.getCap()) {
        return false;
    }

    // TODO: this test could be eased up for circles. Rotations could be allowed.
    if (!matrix.rectStaysRect()) {
        return false;
    }

    // See if the line can be limited to something plausible.
    if (!cull_line(pts, rec, matrix, cullRect, fIntervalLength)) {
        return false;
    }

    SkScalar length = SkPoint::Distance(pts[1], pts[0]);

    SkVector tangent = pts[1] - pts[0];
    if (tangent.isZero()) {
        return false;
    }

    tangent.scale(SkScalarInvert(length));

    // TODO: make this test for horizontal & vertical lines more robust
    bool isXAxis = true;
    if (SkScalarNearlyEqual(SK_Scalar1, tangent.fX) ||
        SkScalarNearlyEqual(-SK_Scalar1, tangent.fX)) {
        results->fSize.set(SkScalarHalf(fIntervals[0]), SkScalarHalf(rec.getWidth()));
    } else if (SkScalarNearlyEqual(SK_Scalar1, tangent.fY) ||
               SkScalarNearlyEqual(-SK_Scalar1, tangent.fY)) {
        results->fSize.set(SkScalarHalf(rec.getWidth()), SkScalarHalf(fIntervals[0]));
        isXAxis = false;
    } else if (SkPaint::kRound_Cap != rec.getCap()) {
        // Angled lines don't have axis-aligned boxes.
        return false;
    }

    if (results) {
        results->fFlags = 0;
        SkScalar clampedInitialDashLength = SkMinScalar(length, fInitialDashLength);

        if (SkPaint::kRound_Cap == rec.getCap()) {
            results->fFlags |= PointData::kCircles_PointFlag;
        }

        results->fNumPoints = 0;
        SkScalar len2 = length;
        if (clampedInitialDashLength > 0 || 0 == fInitialDashIndex) {
            SkASSERT(len2 >= clampedInitialDashLength);
            if (0 == fInitialDashIndex) {
                if (clampedInitialDashLength > 0) {
                    if (clampedInitialDashLength >= fIntervals[0]) {
                        ++results->fNumPoints;  // partial first dash
                    }
                    len2 -= clampedInitialDashLength;
                }
                len2 -= fIntervals[1];  // also skip first space
                if (len2 < 0) {
                    len2 = 0;
                }
            } else {
                len2 -= clampedInitialDashLength; // skip initial partial empty
            }
        }
        int numMidPoints = SkScalarFloorToInt(len2 / fIntervalLength);
        results->fNumPoints += numMidPoints;
        len2 -= numMidPoints * fIntervalLength;
//.........这里部分代码省略.........

// Allow all hairlines and all miters, so long as the miter limit doesn't produce beveled corners.
inline static bool allowed_stroke(const SkStrokeRec& stroke) {
    SkASSERT(stroke.getStyle() == SkStrokeRec::kStroke_Style ||
             stroke.getStyle() == SkStrokeRec::kHairline_Style);
    return !stroke.getWidth() ||
           (stroke.getJoin() == SkPaint::kMiter_Join && stroke.getMiter() > SK_ScalarSqrt2);
}

void GrAARectRenderer::strokeAARect(GrDrawTarget* target,
                                    GrDrawState* drawState,
                                    GrColor color,
                                    const SkRect& rect,
                                    const SkMatrix& combinedMatrix,
                                    const SkRect& devRect,
                                    const SkStrokeRec& stroke) {
    SkVector devStrokeSize;
    SkScalar width = stroke.getWidth();
    if (width > 0) {
        devStrokeSize.set(width, width);
        combinedMatrix.mapVectors(&devStrokeSize, 1);
        devStrokeSize.setAbs(devStrokeSize);
    } else {
        devStrokeSize.set(SK_Scalar1, SK_Scalar1);
    }

    const SkScalar dx = devStrokeSize.fX;
    const SkScalar dy = devStrokeSize.fY;
    const SkScalar rx = SkScalarMul(dx, SK_ScalarHalf);
    const SkScalar ry = SkScalarMul(dy, SK_ScalarHalf);

    // Temporarily #if'ed out. We don't want to pass in the devRect but
    // right now it is computed in GrContext::apply_aa_to_rect and we don't
    // want to throw away the work
#if 0
    SkRect devRect;
    combinedMatrix.mapRect(&devRect, rect);
#endif

    SkScalar spare;
    {
        SkScalar w = devRect.width() - dx;
        SkScalar h = devRect.height() - dy;
        spare = SkTMin(w, h);
    }

    SkRect devOutside(devRect);
    devOutside.outset(rx, ry);

    bool miterStroke = true;
    // For hairlines, make bevel and round joins appear the same as mitered ones.
    // small miter limit means right angles show bevel...
    if ((width > 0) && (stroke.getJoin() != SkPaint::kMiter_Join ||
                        stroke.getMiter() < SK_ScalarSqrt2)) {
        miterStroke = false;
    }

    if (spare <= 0 && miterStroke) {
        this->fillAARect(target, drawState, color, devOutside, SkMatrix::I(), devOutside);
        return;
    }

    SkRect devInside(devRect);
    devInside.inset(rx, ry);

    SkRect devOutsideAssist(devRect);

    // For bevel-stroke, use 2 SkRect instances(devOutside and devOutsideAssist)
    // to draw the outer of the rect. Because there are 8 vertices on the outer
    // edge, while vertex number of inner edge is 4, the same as miter-stroke.
    if (!miterStroke) {
        devOutside.inset(0, ry);
        devOutsideAssist.outset(0, ry);
    }

    this->geometryStrokeAARect(target, drawState, color, devOutside, devOutsideAssist, devInside,
                               miterStroke);
}

bool GrStrokePathRenderer::onDrawPath(const SkPath& origPath,
                                      const SkStrokeRec& stroke,
                                      GrDrawTarget* target,
                                      bool antiAlias) {
    if (origPath.isEmpty()) {
        return true;
    }

    SkScalar width = stroke.getWidth();
    if (width <= 0) {
        return false;
    }

    // Get the join type
    SkPaint::Join join = stroke.getJoin();
    SkScalar miterLimit = stroke.getMiter();
    SkScalar sqMiterLimit = SkScalarMul(miterLimit, miterLimit);
    if ((join == SkPaint::kMiter_Join) && (miterLimit <= SK_Scalar1)) {
        // If the miter limit is small, treat it as a bevel join
        join = SkPaint::kBevel_Join;
    }
    const bool isMiter       = (join == SkPaint::kMiter_Join);
    const bool isBevel       = (join == SkPaint::kBevel_Join);
    SkScalar invMiterLimit   = isMiter ? SK_Scalar1 / miterLimit : 0;
    SkScalar invMiterLimitSq = SkScalarMul(invMiterLimit, invMiterLimit);

    // Allocate vertices
    const int nbQuads     = origPath.countPoints() + 1; // Could be "-1" if path is not closed
    const int extraVerts  = isMiter || isBevel ? 1 : 0;
    const int maxVertexCount = nbQuads * (4 + extraVerts);
    const int maxIndexCount  = nbQuads * (6 + extraVerts * 3); // Each extra vert adds a triangle
    target->drawState()->setDefaultVertexAttribs();
    GrDrawTarget::AutoReleaseGeometry arg(target, maxVertexCount, maxIndexCount);
    if (!arg.succeeded()) {
        return false;
    }
    SkPoint* verts = reinterpret_cast<SkPoint*>(arg.vertices());
    uint16_t* idxs = reinterpret_cast<uint16_t*>(arg.indices());
    int vCount = 0, iCount = 0;

    // Transform the path into a list of triangles
    SkPath::Iter iter(origPath, false);
    SkPoint pts[4];
    const SkScalar radius = SkScalarMul(width, 0.5f);
    SkPoint *firstPt = verts, *lastPt = NULL;
    SkVector firstDir, dir;
    firstDir.set(0, 0);
    dir.set(0, 0);
    bool isOpen = true;
    for(SkPath::Verb v = iter.next(pts); v != SkPath::kDone_Verb; v = iter.next(pts)) {
        switch(v) {
            case SkPath::kMove_Verb:
                // This will already be handled as pts[0] of the 1st line
                break;
            case SkPath::kClose_Verb:
                isOpen = (lastPt == NULL);
                break;
            case SkPath::kLine_Verb:
            {
                SkVector v0 = dir;
                dir = pts[1] - pts[0];
                if (dir.setLength(radius)) {
                    SkVector dirT;
                    dirT.set(dir.fY, -dir.fX); // Get perpendicular direction
                    SkPoint l1a = pts[0]+dirT, l1b = pts[1]+dirT,
                            l2a = pts[0]-dirT, l2b = pts[1]-dirT;
                    SkPoint miterPt[2];
                    bool useMiterPoint = false;
                    int idx0(-1), idx1(-1);
                    if (NULL == lastPt) {
                        firstDir = dir;
                    } else {
                        SkVector v1 = dir;
                        if (v0.normalize() && v1.normalize()) {
                            SkScalar dotProd = v0.dot(v1);
                            // No need for bevel or miter join if the angle
                            // is either 0 or 180 degrees
                            if (!SkScalarNearlyZero(dotProd + SK_Scalar1) &&
                                !SkScalarNearlyZero(dotProd - SK_Scalar1)) {
                                bool ccw = !is_clockwise(v0, v1);
                                int offset = ccw ? 1 : 0;
                                idx0 = vCount-2+offset;
                                idx1 = vCount+offset;
                                const SkPoint* pt0 = &(lastPt[offset]);
                                const SkPoint* pt1 = ccw ? &l2a : &l1a;
                                switch(join) {
                                    case SkPaint::kMiter_Join:
                                    {
                                        // *Note : Logic is from MiterJoiner

                                        // FIXME : Special case if we have a right angle ?
                                        // if (SkScalarNearlyZero(dotProd)) {...}

                                        SkScalar sinHalfAngleSq =
                                                SkScalarHalf(SK_Scalar1 + dotProd);
                                        if (sinHalfAngleSq >= invMiterLimitSq) {
                                            // Find the miter point (or points if it is further
                                            // than the miter limit)
                                            const SkPoint pt2 = *pt0+v0, pt3 = *pt1+v1;
                                            if (intersection(*pt0, pt2, *pt1, pt3, miterPt[0]) !=
//.........这里部分代码省略.........

void GrAARectRenderer::StrokeAARect(GrDrawTarget* target,
                                    const GrPipelineBuilder& pipelineBuilder,
                                    GrColor color,
                                    const SkMatrix& viewMatrix,
                                    const SkRect& rect,
                                    const SkRect& devRect,
                                    const SkStrokeRec& stroke) {
    SkVector devStrokeSize;
    SkScalar width = stroke.getWidth();
    if (width > 0) {
        devStrokeSize.set(width, width);
        viewMatrix.mapVectors(&devStrokeSize, 1);
        devStrokeSize.setAbs(devStrokeSize);
    } else {
        devStrokeSize.set(SK_Scalar1, SK_Scalar1);
    }

    const SkScalar dx = devStrokeSize.fX;
    const SkScalar dy = devStrokeSize.fY;
    const SkScalar rx = SkScalarMul(dx, SK_ScalarHalf);
    const SkScalar ry = SkScalarMul(dy, SK_ScalarHalf);

    SkScalar spare;
    {
        SkScalar w = devRect.width() - dx;
        SkScalar h = devRect.height() - dy;
        spare = SkTMin(w, h);
    }

    SkRect devOutside(devRect);
    devOutside.outset(rx, ry);

    bool miterStroke = true;
    // For hairlines, make bevel and round joins appear the same as mitered ones.
    // small miter limit means right angles show bevel...
    if ((width > 0) && (stroke.getJoin() != SkPaint::kMiter_Join ||
                        stroke.getMiter() < SK_ScalarSqrt2)) {
        miterStroke = false;
    }

    if (spare <= 0 && miterStroke) {
        FillAARect(target, pipelineBuilder, color, viewMatrix, devOutside, devOutside);
        return;
    }

    SkRect devInside(devRect);
    devInside.inset(rx, ry);

    SkRect devOutsideAssist(devRect);

    // For bevel-stroke, use 2 SkRect instances(devOutside and devOutsideAssist)
    // to draw the outer of the rect. Because there are 8 vertices on the outer
    // edge, while vertex number of inner edge is 4, the same as miter-stroke.
    if (!miterStroke) {
        devOutside.inset(0, ry);
        devOutsideAssist.outset(0, ry);
    }

    GeometryStrokeAARect(target, pipelineBuilder, color, viewMatrix, devOutside,
                         devOutsideAssist, devInside, miterStroke);
}

void GrStencilAndCoverTextContext::init(const GrPaint& paint,
                                        const SkPaint& skPaint,
                                        size_t textByteLength,
                                        RenderMode renderMode,
                                        SkScalar textTranslateY) {
    GrTextContext::init(paint, skPaint);

    fContextInitialMatrix = fContext->getMatrix();

    const bool otherBackendsWillDrawAsPaths =
        SkDraw::ShouldDrawTextAsPaths(skPaint, fContextInitialMatrix);

    fNeedsDeviceSpaceGlyphs = !otherBackendsWillDrawAsPaths &&
                              kMaxAccuracy_RenderMode == renderMode &&
                              SkToBool(fContextInitialMatrix.getType() &
                                       (SkMatrix::kScale_Mask | SkMatrix::kAffine_Mask));

    if (fNeedsDeviceSpaceGlyphs) {
        // SkDraw::ShouldDrawTextAsPaths takes care of perspective transforms.
        SkASSERT(!fContextInitialMatrix.hasPerspective());
        SkASSERT(0 == textTranslateY); // TODO: Handle textTranslateY in device-space usecase.

        fTextRatio = fTextInverseRatio = 1.0f;

        // Glyphs loaded by GPU path rendering have an inverted y-direction.
        SkMatrix m;
        m.setScale(1, -1);
        fContext->setMatrix(m);

        // Post-flip the initial matrix so we're left with just the flip after
        // the paint preConcats the inverse.
        m = fContextInitialMatrix;
        m.postScale(1, -1);
        fPaint.localCoordChangeInverse(m);

        // The whole shape (including stroke) will be baked into the glyph outlines. Make
        // NVPR just fill the baked shapes.
        fGlyphCache = fSkPaint.detachCache(&fDeviceProperties, &fContextInitialMatrix, false);
        fGlyphs = get_gr_glyphs(fContext, fGlyphCache->getScalerContext()->getTypeface(),
                                &fGlyphCache->getDescriptor(),
                                SkStrokeRec(SkStrokeRec::kFill_InitStyle));
    } else {
        // Don't bake strokes into the glyph outlines. We will stroke the glyphs
        // using the GPU instead. This is the fast path.
        SkStrokeRec gpuStroke = SkStrokeRec(fSkPaint);
        fSkPaint.setStyle(SkPaint::kFill_Style);

        if (gpuStroke.isHairlineStyle()) {
            // Approximate hairline stroke.
            SkScalar strokeWidth = SK_Scalar1 /
                (SkVector::Make(fContextInitialMatrix.getScaleX(),
                                fContextInitialMatrix.getSkewY()).length());
            gpuStroke.setStrokeStyle(strokeWidth, false /*strokeAndFill*/);

        } else if (fSkPaint.isFakeBoldText() &&
#ifdef SK_USE_FREETYPE_EMBOLDEN
                   kMaxPerformance_RenderMode == renderMode &&
#endif
                   SkStrokeRec::kStroke_Style != gpuStroke.getStyle()) {

            // Instead of baking fake bold into the glyph outlines, do it with the GPU stroke.
            SkScalar fakeBoldScale = SkScalarInterpFunc(fSkPaint.getTextSize(),
                                                        kStdFakeBoldInterpKeys,
                                                        kStdFakeBoldInterpValues,
                                                        kStdFakeBoldInterpLength);
            SkScalar extra = SkScalarMul(fSkPaint.getTextSize(), fakeBoldScale);
            gpuStroke.setStrokeStyle(gpuStroke.needToApply() ? gpuStroke.getWidth() + extra : extra,
                                     true /*strokeAndFill*/);

            fSkPaint.setFakeBoldText(false);
        }

        bool canUseRawPaths;

        if (otherBackendsWillDrawAsPaths || kMaxPerformance_RenderMode == renderMode) {
            // We can draw the glyphs from canonically sized paths.
            fTextRatio = fSkPaint.getTextSize() / SkPaint::kCanonicalTextSizeForPaths;
            fTextInverseRatio = SkPaint::kCanonicalTextSizeForPaths / fSkPaint.getTextSize();

            // Compensate for the glyphs being scaled by fTextRatio.
            if (!gpuStroke.isFillStyle()) {
                gpuStroke.setStrokeStyle(gpuStroke.getWidth() / fTextRatio,
                                         SkStrokeRec::kStrokeAndFill_Style == gpuStroke.getStyle());
            }

            fSkPaint.setLinearText(true);
            fSkPaint.setLCDRenderText(false);
            fSkPaint.setAutohinted(false);
            fSkPaint.setHinting(SkPaint::kNo_Hinting);
            fSkPaint.setSubpixelText(true);
            fSkPaint.setTextSize(SkIntToScalar(SkPaint::kCanonicalTextSizeForPaths));

            canUseRawPaths = SK_Scalar1 == fSkPaint.getTextScaleX() &&
                             0 == fSkPaint.getTextSkewX() &&
                             !fSkPaint.isFakeBoldText() &&
                             !fSkPaint.isVerticalText();
        } else {
            fTextRatio = fTextInverseRatio = 1.0f;
            canUseRawPaths = false;
        }
//.........这里部分代码省略.........