C++ GrMatrix::hasPerspective方法代码示例

int GrGpuGL::TextureMatrixOptFlags(const GrGLTexture* texture,
                                   const GrEffectStage& stage) {
    GrAssert(NULL != texture);
    GrMatrix matrix;
    stage.getTotalMatrix(&matrix);

    bool canBeIndentity = GrSurface::kTopLeft_Origin == texture->origin();

    if (canBeIndentity && matrix.isIdentity()) {
        return GrGLProgram::StageDesc::kIdentityMatrix_OptFlagBit;
    } else if (!matrix.hasPerspective()) {
        return GrGLProgram::StageDesc::kNoPerspective_OptFlagBit;
    }
    return 0;
}

bool GrAAHairLinePathRenderer::createGeom(GrDrawTarget::StageBitfield stages) {

    int rtHeight = fTarget->getRenderTarget()->height();

    GrIRect clip;
    if (fTarget->getClip().hasConservativeBounds()) {
        GrRect clipRect =  fTarget->getClip().getConservativeBounds();
        clipRect.roundOut(&clip);
    } else {
        clip.setLargest();
    }

    // If none of the inputs that affect generation of path geometry have
    // have changed since last previous path draw then we can reuse the
    // previous geoemtry.
    if (stages == fPreviousStages &&
        fPreviousViewMatrix == fTarget->getViewMatrix() &&
        fPreviousTranslate == fTranslate &&
        rtHeight == fPreviousRTHeight &&
        fClipRect == clip) {
        return true;
    }

    GrVertexLayout layout = GrDrawTarget::kEdge_VertexLayoutBit;
    for (int s = 0; s < GrDrawState::kNumStages; ++s) {
        if ((1 << s) & stages) {
            layout |= GrDrawTarget::StagePosAsTexCoordVertexLayoutBit(s);
        }
    }

    GrMatrix viewM = fTarget->getViewMatrix();

    PREALLOC_PTARRAY(128) lines;
    PREALLOC_PTARRAY(128) quads;
    IntArray qSubdivs;
    fQuadCnt = generate_lines_and_quads(*fPath, viewM, fTranslate, clip,
                                        &lines, &quads, &qSubdivs);

    fLineSegmentCnt = lines.count() / 2;
    int vertCnt = kVertsPerLineSeg * fLineSegmentCnt + kVertsPerQuad * fQuadCnt;

    GrAssert(sizeof(Vertex) == GrDrawTarget::VertexSize(layout));

    Vertex* verts;
    if (!fTarget->reserveVertexSpace(layout, vertCnt, (void**)&verts)) {
        return false;
    }
    Vertex* base = verts;

    const GrMatrix* toDevice = NULL;
    const GrMatrix* toSrc = NULL;
    GrMatrix ivm;

    if (viewM.hasPerspective()) {
        if (viewM.invert(&ivm)) {
            toDevice = &viewM;
            toSrc = &ivm;
        }
    }

    for (int i = 0; i < fLineSegmentCnt; ++i) {
        add_line(&lines[2*i], rtHeight, toSrc, &verts);
    }

    int unsubdivQuadCnt = quads.count() / 3;
    for (int i = 0; i < unsubdivQuadCnt; ++i) {
        GrAssert(qSubdivs[i] >= 0);
        add_quads(&quads[3*i], qSubdivs[i], toDevice, toSrc, &verts);
    }

    fPreviousStages = stages;
    fPreviousViewMatrix = fTarget->getViewMatrix();
    fPreviousRTHeight = rtHeight;
    fClipRect = clip;
    fPreviousTranslate = fTranslate;
    return true;
}

bool GrAAConvexPathRenderer::onDrawPath(const SkPath& origPath,
                                        GrPathFill fill,
                                        const GrVec* translate,
                                        GrDrawTarget* target,
                                        GrDrawState::StageMask stageMask,
                                        bool antiAlias) {

    const SkPath* path = &origPath;
    if (path->isEmpty()) {
        return true;
    }
    GrDrawTarget::AutoStateRestore asr(target,
                                       GrDrawTarget::kPreserve_ASRInit);
    GrDrawState* drawState = target->drawState();

    GrMatrix vm = drawState->getViewMatrix();
    if (NULL != translate) {
        vm.postTranslate(translate->fX, translate->fY);
    }
    GrMatrix ivm;
    if (vm.invert(&ivm)) {
        drawState->preConcatSamplerMatrices(stageMask, ivm);
    }
    drawState->viewMatrix()->reset();

    GrVertexLayout layout = 0;
    for (int s = 0; s < GrDrawState::kNumStages; ++s) {
        if ((1 << s) & stageMask) {
            layout |= GrDrawTarget::StagePosAsTexCoordVertexLayoutBit(s);
        }
    }
    layout |= GrDrawTarget::kEdge_VertexLayoutBit;

    // We use the fact that SkPath::transform path does subdivision based on
    // perspective. Otherwise, we apply the view matrix when copying to the
    // segment representation.
    SkPath tmpPath;
    if (vm.hasPerspective()) {
        origPath.transform(vm, &tmpPath);
        path = &tmpPath;
        vm.reset();
    }

    QuadVertex *verts;
    uint16_t* idxs;

    int vCount;
    int iCount;
    enum {
        kPreallocSegmentCnt = 512 / sizeof(Segment),
    };
    SkSTArray<kPreallocSegmentCnt, Segment, true> segments;
    SkPoint fanPt;

    if (!get_segments(*path, vm, &segments, &fanPt, &vCount, &iCount)) {
        return false;
    }

    GrDrawTarget::AutoReleaseGeometry arg(target, layout, vCount, iCount);
    if (!arg.succeeded()) {
        return false;
    }
    verts = reinterpret_cast<QuadVertex*>(arg.vertices());
    idxs = reinterpret_cast<uint16_t*>(arg.indices());

    create_vertices(segments, fanPt, verts, idxs);

    drawState->setVertexEdgeType(GrDrawState::kQuad_EdgeType);
    target->drawIndexed(kTriangles_PrimitiveType,
                        0,        // start vertex
                        0,        // start index
                        vCount,
                        iCount);
    return true;
}

bool GrAAHairLinePathRenderer::createGeom(
            const SkPath& path,
            const GrVec* translate,
            GrDrawTarget* target,
            GrDrawState::StageMask stageMask,
            int* lineCnt,
            int* quadCnt,
            GrDrawTarget::AutoReleaseGeometry* arg) {
    const GrDrawState& drawState = target->getDrawState();
    int rtHeight = drawState.getRenderTarget()->height();

    GrIRect clip;
    if (target->getClip().hasConservativeBounds()) {
        GrRect clipRect =  target->getClip().getConservativeBounds();
        clipRect.roundOut(&clip);
    } else {
        clip.setLargest();
    }


    GrVertexLayout layout = GrDrawTarget::kEdge_VertexLayoutBit;
    GrMatrix viewM = drawState.getViewMatrix();

    PREALLOC_PTARRAY(128) lines;
    PREALLOC_PTARRAY(128) quads;
    IntArray qSubdivs;
    static const GrVec gZeroVec = {0, 0};
    if (NULL == translate) {
        translate = &gZeroVec;
    }
    *quadCnt = generate_lines_and_quads(path, viewM, *translate, clip,
                                        &lines, &quads, &qSubdivs);

    *lineCnt = lines.count() / 2;
    int vertCnt = kVertsPerLineSeg * *lineCnt + kVertsPerQuad * *quadCnt;

    GrAssert(sizeof(Vertex) == GrDrawTarget::VertexSize(layout));

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

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

    const GrMatrix* toDevice = NULL;
    const GrMatrix* toSrc = NULL;
    GrMatrix ivm;

    if (viewM.hasPerspective()) {
        if (viewM.invert(&ivm)) {
            toDevice = &viewM;
            toSrc = &ivm;
        }
    }

    for (int i = 0; i < *lineCnt; ++i) {
        add_line(&lines[2*i], rtHeight, toSrc, &verts);
    }

    int unsubdivQuadCnt = quads.count() / 3;
    for (int i = 0; i < unsubdivQuadCnt; ++i) {
        GrAssert(qSubdivs[i] >= 0);
        add_quads(&quads[3*i], qSubdivs[i], toDevice, toSrc, &verts);
    }

    return true;
}