C++ SkMatrix::invert方法代码示例

void GrDrawContext::drawPaint(GrRenderTarget* rt,
                              const GrClip& clip,
                              const GrPaint& origPaint,
                              const SkMatrix& viewMatrix) {
    RETURN_IF_ABANDONED
    // set rect to be big enough to fill the space, but not super-huge, so we
    // don't overflow fixed-point implementations
    SkRect r;
    r.setLTRB(0, 0,
              SkIntToScalar(rt->width()),
              SkIntToScalar(rt->height()));
    SkTCopyOnFirstWrite<GrPaint> paint(origPaint);

    // by definition this fills the entire clip, no need for AA
    if (paint->isAntiAlias()) {
        paint.writable()->setAntiAlias(false);
    }

    bool isPerspective = viewMatrix.hasPerspective();

    // We attempt to map r by the inverse matrix and draw that. mapRect will
    // map the four corners and bound them with a new rect. This will not
    // produce a correct result for some perspective matrices.
    if (!isPerspective) {
        SkMatrix inverse;
        if (!viewMatrix.invert(&inverse)) {
            SkDebugf("Could not invert matrix\n");
            return;
        }
        inverse.mapRect(&r);
        this->drawRect(rt, clip, *paint, viewMatrix, r);
    } else {
        SkMatrix localMatrix;
        if (!viewMatrix.invert(&localMatrix)) {
            SkDebugf("Could not invert matrix\n");
            return;
        }

        AutoCheckFlush acf(fContext);
        if (!this->prepareToDraw(rt)) {
            return;
        }

        GrPipelineBuilder pipelineBuilder(*paint, rt, clip);
        fDrawTarget->drawBWRect(pipelineBuilder,
                                paint->getColor(),
                                SkMatrix::I(),
                                r,
                                NULL,
                                &localMatrix);
    }
}

void GrSWMaskHelper::DrawToTargetWithPathMask(GrTexture* texture,
                                              GrDrawTarget* target,
                                              GrPipelineBuilder* pipelineBuilder,
                                              GrColor color,
                                              const SkMatrix& viewMatrix,
                                              const SkIRect& rect) {
    SkMatrix invert;
    if (!viewMatrix.invert(&invert)) {
        return;
    }
    GrPipelineBuilder::AutoRestoreFragmentProcessors arfp(pipelineBuilder);

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

    // We use device coords to compute the texture coordinates. We take the device coords and apply
    // a translation so that the top-left of the device bounds maps to 0,0, and then a scaling
    // matrix to normalized coords.
    SkMatrix maskMatrix;
    maskMatrix.setIDiv(texture->width(), texture->height());
    maskMatrix.preTranslate(SkIntToScalar(-rect.fLeft), SkIntToScalar(-rect.fTop));

    pipelineBuilder->addCoverageProcessor(
                         GrSimpleTextureEffect::Create(texture,
                                                       maskMatrix,
                                                       GrTextureParams::kNone_FilterMode,
                                                       kDevice_GrCoordSet))->unref();

    target->drawRect(pipelineBuilder, color, SkMatrix::I(), dstRect, NULL, &invert);
}

 SkPoint invertPt(SkScalar x, SkScalar y) {
     SkPoint pt;
     SkMatrix m;
     fMatrix.invert(&m);
     m.mapXY(x, y, &pt);
     return pt;
 }

void GrSWMaskHelper::DrawToTargetWithShapeMask(sk_sp<GrTextureProxy> proxy,
                                               GrRenderTargetContext* renderTargetContext,
                                               GrPaint&& paint,
                                               const GrUserStencilSettings& userStencilSettings,
                                               const GrClip& clip,
                                               const SkMatrix& viewMatrix,
                                               const SkIPoint& textureOriginInDeviceSpace,
                                               const SkIRect& deviceSpaceRectToDraw) {
    SkMatrix invert;
    if (!viewMatrix.invert(&invert)) {
        return;
    }

    GrResourceProvider* resourceProvider = renderTargetContext->resourceProvider();

    SkRect dstRect = SkRect::Make(deviceSpaceRectToDraw);

    // We use device coords to compute the texture coordinates. We take the device coords and apply
    // a translation so that the top-left of the device bounds maps to 0,0, and then a scaling
    // matrix to normalized coords.
    SkMatrix maskMatrix = SkMatrix::MakeTrans(SkIntToScalar(-textureOriginInDeviceSpace.fX),
                                              SkIntToScalar(-textureOriginInDeviceSpace.fY));
    maskMatrix.preConcat(viewMatrix);
    std::unique_ptr<GrLegacyMeshDrawOp> op = GrRectOpFactory::MakeNonAAFill(
            paint.getColor(), SkMatrix::I(), dstRect, nullptr, &invert);
    paint.addCoverageFragmentProcessor(GrSimpleTextureEffect::Make(
            resourceProvider, std::move(proxy), nullptr, maskMatrix,
            GrSamplerParams::kNone_FilterMode));
    GrPipelineBuilder pipelineBuilder(std::move(paint), GrAAType::kNone);
    pipelineBuilder.setUserStencil(&userStencilSettings);
    renderTargetContext->addLegacyMeshDrawOp(std::move(pipelineBuilder), clip, std::move(op));
}

static bool inverse_transform_bbox(const SkMatrix& matrix, SkRect* bbox) {
    SkMatrix inverse;
    if (!matrix.invert(&inverse)) {
        return false;
    }
    inverse.mapRect(bbox);
    return true;
}

Boolean Matrix::NativeInvert(
    /* [in] */ Int64 matrixHandle,
    /* [in] */ Int64 inverseHandle)
{
    SkMatrix* matrix = reinterpret_cast<SkMatrix*>(matrixHandle);
    SkMatrix* inverse = reinterpret_cast<SkMatrix*>(inverseHandle);
    return matrix->invert(inverse);
}

    virtual void onDraw(SkCanvas* canvas) {
        SkMatrix m;
        m.reset();
        m.setRotate(33 * SK_Scalar1);
        m.postScale(3000 * SK_Scalar1, 3000 * SK_Scalar1);
        m.postTranslate(6000 * SK_Scalar1, -5000 * SK_Scalar1);
        canvas->concat(m);

        SkPaint paint;
        paint.setColor(SK_ColorRED);
        paint.setAntiAlias(true);

        bool success = m.invert(&m);
        SkASSERT(success);
        (void) success; // silence compiler :(

        SkPath path;

        SkPoint pt = {10 * SK_Scalar1, 10 * SK_Scalar1};
        SkScalar small = 1 / (500 * SK_Scalar1);

        m.mapPoints(&pt, 1);
        path.addCircle(pt.fX, pt.fY, small);
        canvas->drawPath(path, paint);

        pt.set(30 * SK_Scalar1, 10 * SK_Scalar1);
        m.mapPoints(&pt, 1);
        SkRect rect = {pt.fX - small, pt.fY - small,
                       pt.fX + small, pt.fY + small};
        canvas->drawRect(rect, paint);

        SkBitmap bmp;
        bmp.setConfig(SkBitmap::kARGB_8888_Config, 2, 2);
        bmp.allocPixels();
        bmp.lockPixels();
        uint32_t* pixels = reinterpret_cast<uint32_t*>(bmp.getPixels());
        pixels[0] = SkPackARGB32(0xFF, 0xFF, 0x00, 0x00);
        pixels[1] = SkPackARGB32(0xFF, 0x00, 0xFF, 0x00);
        pixels[2] = SkPackARGB32(0x80, 0x00, 0x00, 0x00);
        pixels[3] = SkPackARGB32(0xFF, 0x00, 0x00, 0xFF);
        bmp.unlockPixels();
        pt.set(30 * SK_Scalar1, 30 * SK_Scalar1);
        m.mapPoints(&pt, 1);
        SkShader* shader = SkShader::CreateBitmapShader(
                                            bmp,
                                            SkShader::kRepeat_TileMode,
                                            SkShader::kRepeat_TileMode);
        SkMatrix s;
        s.reset();
        s.setScale(SK_Scalar1 / 1000, SK_Scalar1 / 1000);
        shader->setLocalMatrix(s);
        paint.setShader(shader)->unref();
        paint.setAntiAlias(false);
        paint.setFilterLevel(SkPaint::kLow_FilterLevel);
        rect.setLTRB(pt.fX - small, pt.fY - small,
                     pt.fX + small, pt.fY + small);
        canvas->drawRect(rect, paint);
    }

sk_sp<SkNormalSource> SkNormalSource::MakeFromNormalMap(sk_sp<SkShader> map, const SkMatrix& ctm) {
    SkMatrix invCTM;

    if (!ctm.invert(&invCTM) || !map) {
        return nullptr;
    }

    return sk_make_sp<SkNormalMapSourceImpl>(std::move(map), invCTM);
}

bool SkNormalMapSourceImpl::computeNormTotalInverse(const SkShaderBase::ContextRec& rec,
                                                    SkMatrix* normTotalInverse) const {
    SkMatrix total = SkMatrix::Concat(*rec.fMatrix, fMapShader->getLocalMatrix());
    if (rec.fLocalMatrix) {
        total.preConcat(*rec.fLocalMatrix);
    }

    return total.invert(normTotalInverse);
}

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

    GrIRect devClipBounds;
    target->getClip()->getConservativeBounds(drawState.getRenderTarget(),
                                             &devClipBounds);

    GrVertexLayout layout = GrDrawState::kEdge_VertexLayoutBit;
    SkMatrix viewM = drawState.getViewMatrix();

    PREALLOC_PTARRAY(128) lines;
    PREALLOC_PTARRAY(128) quads;
    IntArray qSubdivs;
    *quadCnt = generate_lines_and_quads(path, viewM, devClipBounds,
                                        &lines, &quads, &qSubdivs);

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

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

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

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

    const SkMatrix* toDevice = NULL;
    const SkMatrix* toSrc = NULL;
    SkMatrix 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;
}

void draw(SkCanvas* canvas) {
    SkMatrix matrix;
    matrix.setAll(1, 0, 0,  0, 1, 0,   0, 0, 0);
    if (matrix.invert(&matrix)) {
        SkScalar factor[2] = {2, 2};
        bool result = matrix.getMinMaxScales(factor);
        SkDebugf("matrix.getMinMaxScales() %s %g %g\n",
                result ? "true" : "false", factor[0], factor[1]);
    }
}

static void android_view_RenderNode_getInverseTransformMatrix(JNIEnv* env,
        jobject clazz, jlong renderNodePtr, jlong outMatrixPtr) {
    // load transform matrix
    android_view_RenderNode_getTransformMatrix(env, clazz, renderNodePtr, outMatrixPtr);
    SkMatrix* outMatrix = reinterpret_cast<SkMatrix*>(outMatrixPtr);

    // return it inverted
    if (!outMatrix->invert(outMatrix)) {
        // failed to load inverse, pass back identity
        outMatrix->setIdentity();
    }
}

SkGLDevice::TexCache* SkGLDevice::setupGLPaintShader(const SkPaint& paint) {
    SkGL::SetPaint(paint);
    
    SkShader* shader = paint.getShader();
    if (NULL == shader) {
        return NULL;
    }
    
    if (!shader->setContext(this->accessBitmap(false), paint, this->matrix())) {
        return NULL;
    }
    
    SkBitmap bitmap;
    SkMatrix matrix;
    SkShader::TileMode tileModes[2];
    if (!shader->asABitmap(&bitmap, &matrix, tileModes)) {
        return NULL;
    }
    
    bitmap.lockPixels();
    if (!bitmap.readyToDraw()) {
        return NULL;
    }
    
    // see if we've already cached the bitmap from the shader
    SkPoint max;
    GLuint name;
    TexCache* cache = SkGLDevice::LockTexCache(bitmap, &name, &max);
    // the lock has already called glBindTexture for us
    SkGL::SetTexParams(paint.isFilterBitmap(), tileModes[0], tileModes[1]);
    
    // since our texture coords will be in local space, we wack the texture
    // matrix to map them back into 0...1 before we load it
    SkMatrix localM;
    if (shader->getLocalMatrix(&localM)) {
        SkMatrix inverse;
        if (localM.invert(&inverse)) {
            matrix.preConcat(inverse);
        }
    }
    
    matrix.postScale(max.fX / bitmap.width(), max.fY / bitmap.height());
    glMatrixMode(GL_TEXTURE);
    SkGL::LoadMatrix(matrix);
    glMatrixMode(GL_MODELVIEW);
    
    // since we're going to use a shader/texture, we don't want the color,
    // just its alpha
    SkGL::SetAlpha(paint.getAlpha());
    // report that we have setup the texture
    return cache;
}

bool SkView::globalToLocal(SkScalar x, SkScalar y, SkPoint* local) const {
    if (local) {
        SkMatrix m;
        this->localToGlobal(&m);
        if (!m.invert(&m)) {
            return false;
        }
        SkPoint p;
        m.mapXY(x, y, &p);
        local->set(p.fX, p.fY);
    }

    return true;
}

// Solves linear system to extract klm
// P.K = k (similarly for l, m)
// Where P is matrix of control points
// K is coefficients for the line K
// k is vector of values of K evaluated at the control points
// Solving for K, thus K = P^(-1) . k
static void calc_cubic_klm(const SkPoint p[4], const SkScalar controlK[4],
                           const SkScalar controlL[4], const SkScalar controlM[4],
                           SkScalar k[3], SkScalar l[3], SkScalar m[3]) {
    SkMatrix matrix;
    matrix.setAll(p[0].fX, p[0].fY, 1.f,
                  p[1].fX, p[1].fY, 1.f,
                  p[2].fX, p[2].fY, 1.f);
    SkMatrix inverse;
    if (matrix.invert(&inverse)) {
       inverse.mapHomogeneousPoints(k, controlK, 1);
       inverse.mapHomogeneousPoints(l, controlL, 1);
       inverse.mapHomogeneousPoints(m, controlM, 1);
    }

}