C++ GrDrawState::getViewMatrix方法代码示例

void GrGLProgram::setMatrixAndRenderTargetHeight(const GrDrawState& drawState) {
    const GrRenderTarget* rt = drawState.getRenderTarget();
    SkISize size;
    size.set(rt->width(), rt->height());

    // Load the RT height uniform if it is needed to y-flip gl_FragCoord.
    if (fBuilderOutput.fUniformHandles.fRTHeightUni.isValid() &&
        fMatrixState.fRenderTargetSize.fHeight != size.fHeight) {
        fUniformManager->set1f(fBuilderOutput.fUniformHandles.fRTHeightUni,
                               SkIntToScalar(size.fHeight));
    }

    if (!fBuilderOutput.fHasVertexShader) {
        SkASSERT(!fBuilderOutput.fUniformHandles.fViewMatrixUni.isValid());
        SkASSERT(!fBuilderOutput.fUniformHandles.fRTAdjustmentUni.isValid());
        fGpu->setProjectionMatrix(drawState.getViewMatrix(), size, rt->origin());
    } else if (fMatrixState.fRenderTargetOrigin != rt->origin() ||
               fMatrixState.fRenderTargetSize != size ||
               !fMatrixState.fViewMatrix.cheapEqualTo(drawState.getViewMatrix())) {
        SkASSERT(fBuilderOutput.fUniformHandles.fViewMatrixUni.isValid());

        fMatrixState.fViewMatrix = drawState.getViewMatrix();
        fMatrixState.fRenderTargetSize = size;
        fMatrixState.fRenderTargetOrigin = rt->origin();

        GrGLfloat viewMatrix[3 * 3];
        fMatrixState.getGLMatrix<3>(viewMatrix);
        fUniformManager->setMatrix3f(fBuilderOutput.fUniformHandles.fViewMatrixUni, viewMatrix);

        GrGLfloat rtAdjustmentVec[4];
        fMatrixState.getRTAdjustmentVec(rtAdjustmentVec);
        fUniformManager->set4fv(fBuilderOutput.fUniformHandles.fRTAdjustmentUni, 1, rtAdjustmentVec);
    }
}

void GrGLPathRendering::drawPath(const GrPath* path, SkPath::FillType fill) {
    GrGLuint id = static_cast<const GrGLPath*>(path)->pathID();
    SkASSERT(NULL != fGpu->drawState()->getRenderTarget());
    SkASSERT(NULL != fGpu->drawState()->getRenderTarget()->getStencilBuffer());

    this->flushPathStencilSettings(fill);
    SkASSERT(!fHWPathStencilSettings.isTwoSided());

    const SkStrokeRec& stroke = path->getStroke();

    SkPath::FillType nonInvertedFill = SkPath::ConvertToNonInverseFillType(fill);

    GrGLenum fillMode =
        gr_stencil_op_to_gl_path_rendering_fill_mode(fHWPathStencilSettings.passOp(GrStencilSettings::kFront_Face));
    GrGLint writeMask = fHWPathStencilSettings.writeMask(GrStencilSettings::kFront_Face);

    if (nonInvertedFill == fill) {
        if (stroke.needToApply()) {
            if (SkStrokeRec::kStrokeAndFill_Style == stroke.getStyle()) {
                GL_CALL(StencilFillPath(id, fillMode, writeMask));
            }
            this->stencilThenCoverStrokePath(id, 0xffff, writeMask, GR_GL_BOUNDING_BOX);
        } else {
            this->stencilThenCoverFillPath(id, fillMode, writeMask, GR_GL_BOUNDING_BOX);
        }
    } else {
        if (stroke.isFillStyle() || SkStrokeRec::kStrokeAndFill_Style == stroke.getStyle()) {
            GL_CALL(StencilFillPath(id, fillMode, writeMask));
        }
        if (stroke.needToApply()) {
            GL_CALL(StencilStrokePath(id, 0xffff, writeMask));
        }

        GrDrawState* drawState = fGpu->drawState();
        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);
        }

        fGpu->drawSimpleRect(bounds);
    }
}

void GrInOrderDrawBuffer::onDrawRect(const SkRect& rect,
                                     const SkRect* localRect,
                                     const SkMatrix* localMatrix) {
    GrDrawState* drawState = this->drawState();

    GrColor color = drawState->getColor();

    set_vertex_attributes(drawState, SkToBool(localRect),  color);

    AutoReleaseGeometry geo(this, 4, 0);
    if (!geo.succeeded()) {
        SkDebugf("Failed to get space for vertices!\n");
        return;
    }

    // Go to device coords to allow batching across matrix changes
    SkMatrix matrix = drawState->getViewMatrix();

    // When the caller has provided an explicit source rect for a stage then we don't want to
    // modify that stage's matrix. Otherwise if the effect is generating its source rect from
    // the vertex positions then we have to account for the view matrix change.
    GrDrawState::AutoViewMatrixRestore avmr;
    if (!avmr.setIdentity(drawState)) {
        return;
    }

    size_t vstride = drawState->getVertexStride();

    geo.positions()->setRectFan(rect.fLeft, rect.fTop, rect.fRight, rect.fBottom, vstride);
    matrix.mapPointsWithStride(geo.positions(), vstride, 4);

    SkRect devBounds;
    // since we already computed the dev verts, set the bounds hint. This will help us avoid
    // unnecessary clipping in our onDraw().
    get_vertex_bounds(geo.vertices(), vstride, 4, &devBounds);

    if (localRect) {
        static const int kLocalOffset = sizeof(SkPoint) + sizeof(GrColor);
        SkPoint* coords = GrTCast<SkPoint*>(GrTCast<intptr_t>(geo.vertices()) + kLocalOffset);
        coords->setRectFan(localRect->fLeft, localRect->fTop,
                           localRect->fRight, localRect->fBottom,
                           vstride);
        if (localMatrix) {
            localMatrix->mapPointsWithStride(coords, vstride, 4);
        }
    }

    static const int kColorOffset = sizeof(SkPoint);
    GrColor* vertColor = GrTCast<GrColor*>(GrTCast<intptr_t>(geo.vertices()) + kColorOffset);
    for (int i = 0; i < 4; ++i) {
        *vertColor = color;
        vertColor = (GrColor*) ((intptr_t) vertColor + vstride);
    }

    this->setIndexSourceToBuffer(this->getContext()->getQuadIndexBuffer());
    this->drawIndexedInstances(kTriangles_GrPrimitiveType, 1, 4, 6, &devBounds);

    // to ensure that stashing the drawState ptr is valid
    SkASSERT(this->drawState() == drawState);
}

GrDrawTarget::AutoDeviceCoordDraw::AutoDeviceCoordDraw(
                                            GrDrawTarget* target,
                                            GrDrawState::StageMask stageMask) {
    GrAssert(NULL != target);
    GrDrawState* drawState = target->drawState();

    fDrawTarget = target;
    fViewMatrix = drawState->getViewMatrix();
    fStageMask = stageMask;
    if (fStageMask) {
        GrMatrix invVM;
        if (fViewMatrix.invert(&invVM)) {
            for (int s = 0; s < GrDrawState::kNumStages; ++s) {
                if (fStageMask & (1 << s)) {
                    fSamplerMatrices[s] = drawState->getSampler(s).getMatrix();
                }
            }
            drawState->preConcatSamplerMatrices(fStageMask, invVM);
        } else {
            // sad trombone sound
            fStageMask = 0;
        }
    }
    drawState->viewMatrix()->reset();
}

void GrSWMaskHelper::DrawToTargetWithPathMask(GrTexture* texture,
        GrDrawTarget* target,
        const SkIRect& rect) {
    GrDrawState* drawState = target->drawState();

    GrDrawState::AutoViewMatrixRestore avmr;
    if (!avmr.setIdentity(drawState)) {
        return;
    }
    GrDrawState::AutoRestoreEffects are(drawState);

    SkRect dstRect = SkRect::MakeLTRB(SK_Scalar1 * rect.fLeft,
                                      SK_Scalar1 * rect.fTop,
                                      SK_Scalar1 * rect.fRight,
                                      SK_Scalar1 * rect.fBottom);

    // We want to use device coords to compute the texture coordinates. We set our matrix to be
    // equal to the view matrix followed by a translation so that the top-left of the device bounds
    // maps to 0,0, and then a scaling matrix to normalized coords. We apply this matrix to the
    // vertex positions rather than local coords.
    SkMatrix maskMatrix;
    maskMatrix.setIDiv(texture->width(), texture->height());
    maskMatrix.preTranslate(SkIntToScalar(-rect.fLeft), SkIntToScalar(-rect.fTop));
    maskMatrix.preConcat(drawState->getViewMatrix());

    drawState->addCoverageEffect(
        GrSimpleTextureEffect::Create(texture,
                                      maskMatrix,
                                      GrTextureParams::kNone_FilterMode,
                                      kPosition_GrCoordSet))->unref();

    target->drawSimpleRect(dstRect);
}

void GrClipMaskManager::mergeMask(GrTexture* dstMask,
                                  GrTexture* srcMask,
                                  SkRegion::Op op,
                                  const GrIRect& dstBound,
                                  const GrIRect& srcBound) {
    GrDrawState* drawState = fGpu->drawState();
    SkMatrix oldMatrix = drawState->getViewMatrix();
    drawState->viewMatrix()->reset();

    drawState->setRenderTarget(dstMask->asRenderTarget());

    setup_boolean_blendcoeffs(drawState, op);

    SkMatrix sampleM;
    sampleM.setIDiv(srcMask->width(), srcMask->height());
    drawState->setEffect(0,
        GrTextureDomainEffect::Create(srcMask,
                                      sampleM,
                                      GrTextureDomainEffect::MakeTexelDomain(srcMask, srcBound),
                                      GrTextureDomainEffect::kDecal_WrapMode,
                                      false))->unref();
    fGpu->drawSimpleRect(SkRect::MakeFromIRect(dstBound), NULL);

    drawState->disableStage(0);
    drawState->setViewMatrix(oldMatrix);
}

void GrAAHairLinePathRenderer::drawPath(GrDrawState::StageMask stageMask) {

    if (!this->createGeom(stageMask)) {
        return;
    }

    GrDrawState* drawState = fTarget->drawState();

    GrDrawTarget::AutoStateRestore asr;
    if (!drawState->getViewMatrix().hasPerspective()) {
        asr.set(fTarget);
        GrMatrix ivm;
        if (drawState->getViewInverse(&ivm)) {
            drawState->preConcatSamplerMatrices(stageMask, ivm);
        }
        drawState->setViewMatrix(GrMatrix::I());
    }

    // TODO: See whether rendering lines as degenerate quads improves perf
    // when we have a mix
    fTarget->setIndexSourceToBuffer(fLinesIndexBuffer);
    int lines = 0;
    int nBufLines = fLinesIndexBuffer->maxQuads();
    while (lines < fLineSegmentCnt) {
        int n = GrMin(fLineSegmentCnt-lines, nBufLines);
        drawState->setVertexEdgeType(GrDrawState::kHairLine_EdgeType);
        fTarget->drawIndexed(kTriangles_PrimitiveType,
                             kVertsPerLineSeg*lines,    // startV
                             0,                         // startI
                             kVertsPerLineSeg*n,        // vCount
                             kIdxsPerLineSeg*n);        // iCount
        lines += n;
    }

    fTarget->setIndexSourceToBuffer(fQuadsIndexBuffer);
    int quads = 0;
    while (quads < fQuadCnt) {
        int n = GrMin(fQuadCnt-quads, kNumQuadsInIdxBuffer);
        drawState->setVertexEdgeType(GrDrawState::kHairQuad_EdgeType);
        fTarget->drawIndexed(kTriangles_PrimitiveType,
                             4*fLineSegmentCnt + kVertsPerQuad*quads, // startV
                             0,                                       // startI
                             kVertsPerQuad*n,                         // vCount
                             kIdxsPerQuad*n);                         // iCount
        quads += n;
    }

}

bool GrAAHairLinePathRenderer::createLineGeom(const SkPath& path,
                                              GrDrawTarget* target,
                                              const PtArray& lines,
                                              int lineCnt,
                                              GrDrawTarget::AutoReleaseGeometry* arg,
                                              SkRect* devBounds) {
    GrDrawState* drawState = target->drawState();

    const SkMatrix& viewM = drawState->getViewMatrix();

    int vertCnt = kVertsPerLineSeg * lineCnt;

    drawState->setVertexAttribs<gHairlineLineAttribs>(SK_ARRAY_COUNT(gHairlineLineAttribs),
                                                      sizeof(LineVertex));

    if (!arg->set(target, vertCnt, 0)) {
        return false;
    }

    LineVertex* verts = reinterpret_cast<LineVertex*>(arg->vertices());

    const SkMatrix* toSrc = NULL;
    SkMatrix ivm;

    if (viewM.hasPerspective()) {
        if (viewM.invert(&ivm)) {
            toSrc = &ivm;
        }
    }
    devBounds->set(lines.begin(), lines.count());
    for (int i = 0; i < lineCnt; ++i) {
        add_line(&lines[2*i], toSrc, drawState->getCoverageColor(), &verts);
    }
    // All the verts computed by add_line are within sqrt(1^2 + 0.5^2) of the end points.
    static const SkScalar kSqrtOfOneAndAQuarter = 1.118f;
    // Add a little extra to account for vector normalization precision.
    static const SkScalar kOutset = kSqrtOfOneAndAQuarter + SK_Scalar1 / 20;
    devBounds->outset(kOutset, kOutset);

    return true;
}

void GrSWMaskHelper::DrawToTargetWithPathMask(GrTexture* texture,
        GrDrawTarget* target,
        const GrIRect& rect) {
    GrDrawState* drawState = target->drawState();

    GrDrawState::AutoDeviceCoordDraw adcd(drawState);
    if (!adcd.succeeded()) {
        return;
    }
    enum {
        // the SW path renderer shares this stage with glyph
        // rendering (kGlyphMaskStage in GrTextContext)
        // && edge rendering (kEdgeEffectStage in GrContext)
        kPathMaskStage = GrPaint::kTotalStages,
    };

    GrRect dstRect = GrRect::MakeLTRB(
                         SK_Scalar1 * rect.fLeft,
                         SK_Scalar1 * rect.fTop,
                         SK_Scalar1 * rect.fRight,
                         SK_Scalar1 * rect.fBottom);

    // We want to use device coords to compute the texture coordinates. We set our matrix to be
    // equal to the view matrix followed by a translation so that the top-left of the device bounds
    // maps to 0,0, and then a scaling matrix to normalized coords. We apply this matrix to the
    // vertex positions rather than local coords.
    SkMatrix maskMatrix;
    maskMatrix.setIDiv(texture->width(), texture->height());
    maskMatrix.preTranslate(SkIntToScalar(-rect.fLeft), SkIntToScalar(-rect.fTop));
    maskMatrix.preConcat(drawState->getViewMatrix());

    GrAssert(!drawState->isStageEnabled(kPathMaskStage));
    drawState->setEffect(kPathMaskStage,
                         GrSimpleTextureEffect::Create(texture,
                                 maskMatrix,
                                 false,
                                 GrEffect::kPosition_CoordsType))->unref();

    target->drawSimpleRect(dstRect);
    drawState->disableStage(kPathMaskStage);
}

GrOptDrawState::GrOptDrawState(const GrDrawState& drawState,
                               BlendOptFlags blendOptFlags,
                               GrBlendCoeff optSrcCoeff,
                               GrBlendCoeff optDstCoeff,
                               const GrDrawTargetCaps& caps) : INHERITED(drawState) {
    fColor = drawState.getColor();
    fCoverage = drawState.getCoverage();
    fViewMatrix = drawState.getViewMatrix();
    fBlendConstant = drawState.getBlendConstant();
    fFlagBits = drawState.getFlagBits();
    fVAPtr = drawState.getVertexAttribs();
    fVACount = drawState.getVertexAttribCount();
    fVAStride = drawState.getVertexStride();
    fStencilSettings = drawState.getStencil();
    fDrawFace = drawState.getDrawFace();
    fBlendOptFlags = blendOptFlags;
    fSrcBlend = optSrcCoeff;
    fDstBlend = optDstCoeff;

    memcpy(fFixedFunctionVertexAttribIndices,
            drawState.getFixedFunctionVertexAttribIndices(),
            sizeof(fFixedFunctionVertexAttribIndices));


    fInputColorIsUsed = true;
    fInputCoverageIsUsed = true;

    if (drawState.hasGeometryProcessor()) {
        fGeometryProcessor.reset(SkNEW_ARGS(GrGeometryStage, (*drawState.getGeometryProcessor())));
    } else {
        fGeometryProcessor.reset(NULL);
    }

    this->copyEffectiveColorStages(drawState);
    this->copyEffectiveCoverageStages(drawState);
    this->adjustFromBlendOpts();
    this->getStageStats();
    this->setOutputStateInfo(caps);
};

////////////////////////////////////////////////////////////////////////////////
// return true on success; false on failure
bool GrSoftwarePathRenderer::onDrawPath(const SkPath& path,
                                        const SkStrokeRec& stroke,
                                        GrDrawTarget* target,
                                        bool antiAlias) {

    if (NULL == fContext) {
        return false;
    }

    GrDrawState* drawState = target->drawState();

    SkMatrix vm = drawState->getViewMatrix();

    GrIRect devPathBounds, devClipBounds;
    if (!get_path_and_clip_bounds(target, path, vm,
                                  &devPathBounds, &devClipBounds)) {
        if (path.isInverseFillType()) {
            draw_around_inv_path(target, devClipBounds, devPathBounds);
        }
        return true;
    }

    SkAutoTUnref<GrTexture> texture(
            GrSWMaskHelper::DrawPathMaskToTexture(fContext, path, stroke,
                                                  devPathBounds,
                                                  antiAlias, &vm));
    if (NULL == texture) {
        return false;
    }

    GrSWMaskHelper::DrawToTargetWithPathMask(texture, target, devPathBounds);

    if (path.isInverseFillType()) {
        draw_around_inv_path(target, devClipBounds, devPathBounds);
    }

    return true;
}

bool GrAAHairLinePathRenderer::onDrawPath(const SkPath& path,
                                          const SkStrokeRec&,
                                          GrDrawTarget* target,
                                          bool antiAlias) {

    int lineCnt;
    int quadCnt;
    GrDrawTarget::AutoReleaseGeometry arg;
    if (!this->createGeom(path,
                          target,
                          &lineCnt,
                          &quadCnt,
                          &arg)) {
        return false;
    }

    GrDrawState::AutoDeviceCoordDraw adcd;
    GrDrawState* drawState = target->drawState();
    // createGeom transforms the geometry to device space when the matrix does not have
    // perspective.
    if (!drawState->getViewMatrix().hasPerspective()) {
        adcd.set(drawState);
        if (!adcd.succeeded()) {
            return false;
        }
    }

    // TODO: See whether rendering lines as degenerate quads improves perf
    // when we have a mix

    GrDrawState::VertexEdgeType oldEdgeType = drawState->getVertexEdgeType();

    target->setIndexSourceToBuffer(fLinesIndexBuffer);
    int lines = 0;
    int nBufLines = fLinesIndexBuffer->maxQuads();
    drawState->setVertexEdgeType(GrDrawState::kHairLine_EdgeType);
    while (lines < lineCnt) {
        int n = GrMin(lineCnt - lines, nBufLines);
        target->drawIndexed(kTriangles_GrPrimitiveType,
                            kVertsPerLineSeg*lines,    // startV
                            0,                         // startI
                            kVertsPerLineSeg*n,        // vCount
                            kIdxsPerLineSeg*n);        // iCount
        lines += n;
    }

    target->setIndexSourceToBuffer(fQuadsIndexBuffer);
    int quads = 0;
    drawState->setVertexEdgeType(GrDrawState::kHairQuad_EdgeType);
    while (quads < quadCnt) {
        int n = GrMin(quadCnt - quads, kNumQuadsInIdxBuffer);
        target->drawIndexed(kTriangles_GrPrimitiveType,
                            4 * lineCnt + kVertsPerQuad*quads, // startV
                            0,                                 // startI
                            kVertsPerQuad*n,                   // vCount
                            kIdxsPerQuad*n);                   // iCount
        quads += n;
    }
    drawState->setVertexEdgeType(oldEdgeType);
    return true;
}

bool GrStencilAndCoverPathRenderer::onDrawPath(const SkPath& path,
                                               GrPathFill fill,
                                               GrDrawTarget* target,
                                               bool antiAlias) {
    GrAssert(!antiAlias);
    GrAssert(kHairLine_GrPathFill != fill);

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

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

    GrPathFill nonInvertedFill = GrNonInvertedFill(fill);
    target->stencilPath(p, 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
    GrRect bounds = p->getBounds();
    GrScalar bloat = drawState->getViewMatrix().getMaxStretch() * GR_ScalarHalf;
    GrDrawState::AutoDeviceCoordDraw adcd;

    if (nonInvertedFill == fill) {
        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);
        GrMatrix vmi;
        bounds.setLTRB(0, 0,
                       GrIntToScalar(drawState->getRenderTarget()->width()),
                       GrIntToScalar(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 {
            adcd.set(drawState);
            bloat = 0;
        }
        *drawState->stencil() = kInvertedStencilPass;
    }
    bounds.outset(bloat, bloat);
    target->drawSimpleRect(bounds, NULL);
    target->drawState()->stencil()->setDisabled();
    return true;
}

void GrInOrderDrawBuffer::onDrawRect(const GrRect& rect,
                                     const SkMatrix* matrix,
                                     const GrRect* localRect,
                                     const SkMatrix* localMatrix) {
    GrDrawState::AutoColorRestore acr;

    GrDrawState* drawState = this->drawState();

    GrColor color = drawState->getColor();

    int colorOffset, localOffset;
    set_vertex_attributes(drawState,
                   this->caps()->dualSourceBlendingSupport() || drawState->hasSolidCoverage(),
                   NULL != localRect,
                   &colorOffset, &localOffset);
    if (colorOffset >= 0) {
        // We set the draw state's color to white here. This is done so that any batching performed
        // in our subclass's onDraw() won't get a false from GrDrawState::op== due to a color
        // mismatch. TODO: Once vertex layout is owned by GrDrawState it should skip comparing the
        // constant color in its op== when the kColor layout bit is set and then we can remove
        // this.
        acr.set(drawState, 0xFFFFFFFF);
    }

    AutoReleaseGeometry geo(this, 4, 0);
    if (!geo.succeeded()) {
        GrPrintf("Failed to get space for vertices!\n");
        return;
    }

    // Go to device coords to allow batching across matrix changes
    SkMatrix combinedMatrix;
    if (NULL != matrix) {
        combinedMatrix = *matrix;
    } else {
        combinedMatrix.reset();
    }
    combinedMatrix.postConcat(drawState->getViewMatrix());
    // When the caller has provided an explicit source rect for a stage then we don't want to
    // modify that stage's matrix. Otherwise if the effect is generating its source rect from
    // the vertex positions then we have to account for the view matrix change.
    GrDrawState::AutoViewMatrixRestore avmr;
    if (!avmr.setIdentity(drawState)) {
        return;
    }

    size_t vsize = drawState->getVertexSize();

    geo.positions()->setRectFan(rect.fLeft, rect.fTop, rect.fRight, rect.fBottom, vsize);
    combinedMatrix.mapPointsWithStride(geo.positions(), vsize, 4);

    SkRect devBounds;
    // since we already computed the dev verts, set the bounds hint. This will help us avoid
    // unnecessary clipping in our onDraw().
    get_vertex_bounds(geo.vertices(), vsize, 4, &devBounds);

    if (localOffset >= 0) {
        GrPoint* coords = GrTCast<GrPoint*>(GrTCast<intptr_t>(geo.vertices()) + localOffset);
        coords->setRectFan(localRect->fLeft, localRect->fTop,
                           localRect->fRight, localRect->fBottom,
                            vsize);
        if (NULL != localMatrix) {
            localMatrix->mapPointsWithStride(coords, vsize, 4);
        }
    }

    if (colorOffset >= 0) {
        GrColor* vertColor = GrTCast<GrColor*>(GrTCast<intptr_t>(geo.vertices()) + colorOffset);
        for (int i = 0; i < 4; ++i) {
            *vertColor = color;
            vertColor = (GrColor*) ((intptr_t) vertColor + vsize);
        }
    }

    this->setIndexSourceToBuffer(this->getContext()->getQuadIndexBuffer());
    this->drawIndexedInstances(kTriangles_GrPrimitiveType, 1, 4, 6, &devBounds);

    // to ensure that stashing the drawState ptr is valid
    GrAssert(this->drawState() == drawState);
}

bool GrDefaultPathRenderer::internalDrawPath(const SkPath& path,
                                             const SkStrokeRec& origStroke,
                                             GrDrawTarget* target,
                                             bool stencilOnly) {

    SkMatrix viewM = target->getDrawState().getViewMatrix();
    SkTCopyOnFirstWrite<SkStrokeRec> stroke(origStroke);

    SkScalar hairlineCoverage;
    if (IsStrokeHairlineOrEquivalent(*stroke, target->getDrawState().getViewMatrix(),
                                     &hairlineCoverage)) {
        uint8_t newCoverage = SkScalarRoundToInt(hairlineCoverage *
                                                 target->getDrawState().getCoverage());
        target->drawState()->setCoverage(newCoverage);

        if (!stroke->isHairlineStyle()) {
            stroke.writable()->setHairlineStyle();
        }
    }

    SkScalar tol = SK_Scalar1;
    tol = GrPathUtils::scaleToleranceToSrc(tol, viewM, path.getBounds());

    int vertexCnt;
    int indexCnt;
    GrPrimitiveType primType;
    GrDrawTarget::AutoReleaseGeometry arg;
    if (!this->createGeom(path,
                          *stroke,
                          tol,
                          target,
                          &primType,
                          &vertexCnt,
                          &indexCnt,
                          &arg)) {
        return false;
    }

    SkASSERT(NULL != target);
    GrDrawTarget::AutoStateRestore asr(target, GrDrawTarget::kPreserve_ASRInit);
    GrDrawState* drawState = target->drawState();
    bool colorWritesWereDisabled = drawState->isColorWriteDisabled();
    // face culling doesn't make sense here
    SkASSERT(GrDrawState::kBoth_DrawFace == drawState->getDrawFace());

    int                         passCount = 0;
    const GrStencilSettings*    passes[3];
    GrDrawState::DrawFace       drawFace[3];
    bool                        reverse = false;
    bool                        lastPassIsBounds;

    if (stroke->isHairlineStyle()) {
        passCount = 1;
        if (stencilOnly) {
            passes[0] = &gDirectToStencil;
        } else {
            passes[0] = NULL;
        }
        lastPassIsBounds = false;
        drawFace[0] = GrDrawState::kBoth_DrawFace;
    } else {
        if (single_pass_path(path, *stroke)) {
            passCount = 1;
            if (stencilOnly) {
                passes[0] = &gDirectToStencil;
            } else {
                passes[0] = NULL;
            }
            drawFace[0] = GrDrawState::kBoth_DrawFace;
            lastPassIsBounds = false;
        } else {
            switch (path.getFillType()) {
                case SkPath::kInverseEvenOdd_FillType:
                    reverse = true;
                    // fallthrough
                case SkPath::kEvenOdd_FillType:
                    passes[0] = &gEOStencilPass;
                    if (stencilOnly) {
                        passCount = 1;
                        lastPassIsBounds = false;
                    } else {
                        passCount = 2;
                        lastPassIsBounds = true;
                        if (reverse) {
                            passes[1] = &gInvEOColorPass;
                        } else {
                            passes[1] = &gEOColorPass;
                        }
                    }
                    drawFace[0] = drawFace[1] = GrDrawState::kBoth_DrawFace;
                    break;

                case SkPath::kInverseWinding_FillType:
                    reverse = true;
                    // fallthrough
                case SkPath::kWinding_FillType:
                    if (fSeparateStencil) {
                        if (fStencilWrapOps) {
                            passes[0] = &gWindStencilSeparateWithWrap;
                        } else {
//.........这里部分代码省略.........