C++ SkStrokeRec::isHairlineStyle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);
    }
}

void GrDrawTarget::stencilPath(const GrPath* path, const SkStrokeRec& stroke, SkPath::FillType fill) {
    // TODO: extract portions of checkDraw that are relevant to path stenciling.
    GrAssert(NULL != path);
    GrAssert(fCaps.pathStencilingSupport());
    GrAssert(!stroke.isHairlineStyle());
    GrAssert(!SkPath::IsInverseFillType(fill));
    this->onStencilPath(path, stroke, fill);
}

bool GrStencilAndCoverPathRenderer::canDrawPath(const SkPath& path,
                                                const SkStrokeRec& stroke,
                                                const GrDrawTarget* target,
                                                bool antiAlias) const {
    return !stroke.isHairlineStyle() &&
           !antiAlias && // doesn't do per-path AA, relies on the target having MSAA
           target->getDrawState().getRenderTarget()->getStencilBuffer() &&
           target->getDrawState().getStencil().isDisabled();
}

static inline bool single_pass_path(const SkPath& path, const SkStrokeRec& stroke) {
#if STENCIL_OFF
    return true;
#else
    if (!stroke.isHairlineStyle() && !path.isInverseFillType()) {
        return path.isConvex();
    }
    return false;
#endif
}

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;
}

/**
 * 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);
    }
}

bool GrStencilAndCoverPathRenderer::onDrawPath(const SkPath& path,
                                               const SkStrokeRec& stroke,
                                               GrDrawTarget* target,
                                               bool antiAlias) {
    SkASSERT(!antiAlias);
    SkASSERT(!stroke.isHairlineStyle());

    GrDrawState* drawState = target->drawState();
    SkASSERT(drawState->getStencil().isDisabled());

    SkAutoTUnref<GrPath> p(fGpu->createPath(path));

    SkPath::FillType nonInvertedFill = SkPath::ConvertToNonInverseFillType(path.getFillType());
    target->stencilPath(p, stroke, nonInvertedFill);

    // TODO: Use built in cover operation rather than a rect draw. This will require making our
    // fragment shaders be able to eat varyings generated by a matrix.

    // fill the path, zero out the stencil
    SkRect bounds = p->getBounds();
    SkScalar bloat = drawState->getViewMatrix().getMaxStretch() * SK_ScalarHalf;
    GrDrawState::AutoViewMatrixRestore avmr;

    if (nonInvertedFill == path.getFillType()) {
        GR_STATIC_CONST_SAME_STENCIL(kStencilPass,
            kZero_StencilOp,
            kZero_StencilOp,
            kNotEqual_StencilFunc,
            0xffff,
            0x0000,
            0xffff);
        *drawState->stencil() = kStencilPass;
    } else {
        GR_STATIC_CONST_SAME_STENCIL(kInvertedStencilPass,
            kZero_StencilOp,
            kZero_StencilOp,
            // We know our rect will hit pixels outside the clip and the user bits will be 0
            // outside the clip. So we can't just fill where the user bits are 0. We also need to
            // check that the clip bit is set.
            kEqualIfInClip_StencilFunc,
            0xffff,
            0x0000,
            0xffff);
        SkMatrix vmi;
        bounds.setLTRB(0, 0,
                       SkIntToScalar(drawState->getRenderTarget()->width()),
                       SkIntToScalar(drawState->getRenderTarget()->height()));
        // mapRect through persp matrix may not be correct
        if (!drawState->getViewMatrix().hasPerspective() && drawState->getViewInverse(&vmi)) {
            vmi.mapRect(&bounds);
            // theoretically could set bloat = 0, instead leave it because of matrix inversion
            // precision.
        } else {
            avmr.setIdentity(drawState);
            bloat = 0;
        }
        *drawState->stencil() = kInvertedStencilPass;
    }
    bounds.outset(bloat, bloat);
    target->drawSimpleRect(bounds, NULL);
    target->drawState()->stencil()->setDisabled();
    return true;
}

bool GrDefaultPathRenderer::createGeom(const SkPath& path,
                                       const SkStrokeRec& stroke,
                                       SkScalar srcSpaceTol,
                                       GrDrawTarget* target,
                                       GrPrimitiveType* primType,
                                       int* vertexCnt,
                                       int* indexCnt,
                                       GrDrawTarget::AutoReleaseGeometry* arg) {
    {
    SkScalar srcSpaceTolSqd = SkScalarMul(srcSpaceTol, srcSpaceTol);
    int contourCnt;
    int maxPts = GrPathUtils::worstCasePointCount(path, &contourCnt,
                                                  srcSpaceTol);

    if (maxPts <= 0) {
        return false;
    }
    if (maxPts > ((int)SK_MaxU16 + 1)) {
        GrPrintf("Path not rendered, too many verts (%d)\n", maxPts);
        return false;
    }

    bool indexed = contourCnt > 1;

    const bool isHairline = stroke.isHairlineStyle();

    int maxIdxs = 0;
    if (isHairline) {
        if (indexed) {
            maxIdxs = 2 * maxPts;
            *primType = kLines_GrPrimitiveType;
        } else {
            *primType = kLineStrip_GrPrimitiveType;
        }
    } else {
        if (indexed) {
            maxIdxs = 3 * maxPts;
            *primType = kTriangles_GrPrimitiveType;
        } else {
            *primType = kTriangleFan_GrPrimitiveType;
        }
    }

    target->drawState()->setDefaultVertexAttribs();
    if (!arg->set(target, maxPts, maxIdxs)) {
        return false;
    }

    uint16_t* idxBase = reinterpret_cast<uint16_t*>(arg->indices());
    uint16_t* idx = idxBase;
    uint16_t subpathIdxStart = 0;

    SkPoint* base = reinterpret_cast<SkPoint*>(arg->vertices());
    SkASSERT(NULL != base);
    SkPoint* vert = base;

    SkPoint pts[4];

    bool first = true;
    int subpath = 0;

    SkPath::Iter iter(path, false);

    for (;;) {
        SkPath::Verb verb = iter.next(pts);
        switch (verb) {
            case SkPath::kConic_Verb:
                SkASSERT(0);
                break;
            case SkPath::kMove_Verb:
                if (!first) {
                    uint16_t currIdx = (uint16_t) (vert - base);
                    subpathIdxStart = currIdx;
                    ++subpath;
                }
                *vert = pts[0];
                vert++;
                break;
            case SkPath::kLine_Verb:
                if (indexed) {
                    uint16_t prevIdx = (uint16_t)(vert - base) - 1;
                    append_countour_edge_indices(isHairline, subpathIdxStart,
                                                 prevIdx, &idx);
                }
                *(vert++) = pts[1];
                break;
            case SkPath::kQuad_Verb: {
                // first pt of quad is the pt we ended on in previous step
                uint16_t firstQPtIdx = (uint16_t)(vert - base) - 1;
                uint16_t numPts =  (uint16_t)
                    GrPathUtils::generateQuadraticPoints(
                            pts[0], pts[1], pts[2],
                            srcSpaceTolSqd, &vert,
                            GrPathUtils::quadraticPointCount(pts, srcSpaceTol));
                if (indexed) {
                    for (uint16_t i = 0; i < numPts; ++i) {
                        append_countour_edge_indices(isHairline, subpathIdxStart,
                                                     firstQPtIdx + i, &idx);
                    }
                }
//.........这里部分代码省略.........

bool GrStencilAndCoverPathRenderer::onDrawPath(const SkPath& path,
                                               const SkStrokeRec& stroke,
                                               GrDrawTarget* target,
                                               bool antiAlias) {
    SkASSERT(!antiAlias);
    SkASSERT(!stroke.isHairlineStyle());

    GrDrawState* drawState = target->drawState();
    SkASSERT(drawState->getStencil().isDisabled());

    SkAutoTUnref<GrPath> p(get_gr_path(fGpu, path, stroke));

    if (path.isInverseFillType()) {
        GR_STATIC_CONST_SAME_STENCIL(kInvertedStencilPass,
            kZero_StencilOp,
            kZero_StencilOp,
            // We know our rect will hit pixels outside the clip and the user bits will be 0
            // outside the clip. So we can't just fill where the user bits are 0. We also need to
            // check that the clip bit is set.
            kEqualIfInClip_StencilFunc,
            0xffff,
            0x0000,
            0xffff);

        drawState->setStencil(kInvertedStencilPass);

        // fake inverse with a stencil and cover
        target->stencilPath(p, convert_skpath_filltype(path.getFillType()));

        GrDrawState::AutoViewMatrixRestore avmr;
        SkRect bounds = SkRect::MakeLTRB(0, 0,
                                         SkIntToScalar(drawState->getRenderTarget()->width()),
                                         SkIntToScalar(drawState->getRenderTarget()->height()));
        SkMatrix vmi;
        // mapRect through persp matrix may not be correct
        if (!drawState->getViewMatrix().hasPerspective() && drawState->getViewInverse(&vmi)) {
            vmi.mapRect(&bounds);
            // theoretically could set bloat = 0, instead leave it because of matrix inversion
            // precision.
            SkScalar bloat = drawState->getViewMatrix().getMaxScale() * SK_ScalarHalf;
            bounds.outset(bloat, bloat);
        } else {
            avmr.setIdentity(drawState);
        }
        target->drawSimpleRect(bounds);
    } else {
        GR_STATIC_CONST_SAME_STENCIL(kStencilPass,
            kZero_StencilOp,
            kZero_StencilOp,
            kNotEqual_StencilFunc,
            0xffff,
            0x0000,
            0xffff);

        drawState->setStencil(kStencilPass);
        target->drawPath(p, convert_skpath_filltype(path.getFillType()));
    }

    target->drawState()->stencil()->setDisabled();
    return true;
}

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.........