C++ SkRect::setEmpty方法代码示例

void CanvasContext::draw() {
    LOG_ALWAYS_FATAL_IF(!mCanvas || mEglSurface == EGL_NO_SURFACE,
            "drawRenderNode called on a context with no canvas or surface!");

    SkRect dirty;
    mDamageAccumulator.finish(&dirty);

    // TODO: Re-enable after figuring out cause of b/22592975
//    if (dirty.isEmpty() && Properties::skipEmptyFrames) {
//        mCurrentFrameInfo->addFlag(FrameInfoFlags::SkippedFrame);
//        return;
//    }

    mCurrentFrameInfo->markIssueDrawCommandsStart();

    EGLint width, height;
    mEglManager.beginFrame(mEglSurface, &width, &height);
    if (width != mCanvas->getViewportWidth() || height != mCanvas->getViewportHeight()) {
        mCanvas->setViewport(width, height);
        dirty.setEmpty();
    } else if (!mBufferPreserved || mHaveNewSurface) {
        dirty.setEmpty();
    } else {
        if (!dirty.isEmpty() && !dirty.intersect(0, 0, width, height)) {
            ALOGW("Dirty " RECT_STRING " doesn't intersect with 0 0 %d %d ?",
                    SK_RECT_ARGS(dirty), width, height);
            dirty.setEmpty();
        }
        profiler().unionDirty(&dirty);
    }

    if (!dirty.isEmpty()) {
        mCanvas->prepareDirty(dirty.fLeft, dirty.fTop,
                dirty.fRight, dirty.fBottom, mOpaque);
    } else {
        mCanvas->prepare(mOpaque);
    }

    Rect outBounds;
    mCanvas->drawRenderNode(mRootRenderNode.get(), outBounds);

    profiler().draw(mCanvas);

    bool drew = mCanvas->finish();

    // Even if we decided to cancel the frame, from the perspective of jank
    // metrics the frame was swapped at this point
    mCurrentFrameInfo->markSwapBuffers();

    if (drew) {
        swapBuffers(dirty, width, height);
    }

    // TODO: Use a fence for real completion?
    mCurrentFrameInfo->markFrameCompleted();
    mJankTracker.addFrame(*mCurrentFrameInfo);
    mRenderThread.jankTracker().addFrame(*mCurrentFrameInfo);
}

void CanvasContext::draw() {
    LOG_ALWAYS_FATAL_IF(!mCanvas || mEglSurface == EGL_NO_SURFACE,
            "drawRenderNode called on a context with no canvas or surface!");

    profiler().markPlaybackStart();

    SkRect dirty;
    mDamageAccumulator.finish(&dirty);

    EGLint width, height;
    mEglManager.beginFrame(mEglSurface, &width, &height);
    if (width != mCanvas->getViewportWidth() || height != mCanvas->getViewportHeight()) {
        mCanvas->setViewport(width, height);
        dirty.setEmpty();
    } else if (!mBufferPreserved || mHaveNewSurface) {
        dirty.setEmpty();
    } else {
        if (!dirty.isEmpty() && !dirty.intersect(0, 0, width, height)) {
            //ALOGW("Dirty " RECT_STRING " doesn't intersect with 0 0 %d %d ?",
            //        SK_RECT_ARGS(dirty), width, height);
            dirty.setEmpty();
        }
        profiler().unionDirty(&dirty);
    }

    status_t status;
    if (!dirty.isEmpty()) {
        status = mCanvas->prepareDirty(dirty.fLeft, dirty.fTop,
                dirty.fRight, dirty.fBottom, mOpaque);
    } else {
        status = mCanvas->prepare(mOpaque);
    }

    Rect outBounds;
    status |= mCanvas->drawRenderNode(mRootRenderNode.get(), outBounds);

    profiler().draw(mCanvas);

    mCanvas->finish();

    profiler().markPlaybackEnd();

    if (status & DrawGlInfo::kStatusDrew) {
        swapBuffers();
    } else {
        mEglManager.cancelFrame();
    }

    profiler().finishFrame();
}

 void onDraw(SkCanvas* canvas) override {
     SkPaint blurPaint;
     SkAutoTUnref<SkImageFilter> blur(SkBlurImageFilter::Create(5.0f, 5.0f));
     blurPaint.setImageFilter(blur);
     const SkScalar tile_size = SkIntToScalar(128);
     SkRect bounds;
     if (!canvas->getClipBounds(&bounds)) {
         bounds.setEmpty();
     }
     int ts = SkScalarCeilToInt(tile_size);
     SkImageInfo info = SkImageInfo::MakeN32Premul(ts, ts);
     SkAutoTUnref<SkSurface> tileSurface(canvas->newSurface(info));
     if (!tileSurface.get()) {
         tileSurface.reset(SkSurface::NewRaster(info));
     }
     SkCanvas* tileCanvas = tileSurface->getCanvas();
     for (SkScalar y = bounds.top(); y < bounds.bottom(); y += tile_size) {
         for (SkScalar x = bounds.left(); x < bounds.right(); x += tile_size) {
             tileCanvas->save();
             tileCanvas->clear(0);
             tileCanvas->translate(-x, -y);
             SkRect rect = SkRect::MakeWH(WIDTH, HEIGHT);
             tileCanvas->saveLayer(&rect, &blurPaint);
             SkRRect rrect = SkRRect::MakeRectXY(rect.makeInset(20, 20), 25, 25);
             tileCanvas->clipRRect(rrect, SkRegion::kDifference_Op, true);
             SkPaint paint;
             tileCanvas->drawRect(rect, paint);
             tileCanvas->restore();
             tileCanvas->restore();
             canvas->drawImage(tileSurface->makeImageSnapshot().get(), x, y);
         }
     }
 }

 SkRect* operator()() const {
     SkRect* rect = SkNEW(SkRect);
     if (!fTypeface.onComputeBounds(rect)) {
         rect->setEmpty();
     }
     return rect;
 }

 virtual void onDraw(SkCanvas* canvas) {
     SkPaint paint;
     paint.setImageFilter(SkBlurImageFilter::Create(fSigmaX, fSigmaY))->unref();
     const SkScalar tile_size = SkIntToScalar(128);
     SkRect bounds;
     if (!canvas->getClipBounds(&bounds)) {
         bounds.setEmpty();
     }
     for (SkScalar y = bounds.top(); y < bounds.bottom(); y += tile_size) {
         for (SkScalar x = bounds.left(); x < bounds.right(); x += tile_size) {
             canvas->save();
             canvas->clipRect(SkRect::MakeXYWH(x, y, tile_size, tile_size));
             canvas->saveLayer(NULL, &paint);
             const char* str[] = {
                 "The quick",
                 "brown fox",
                 "jumped over",
                 "the lazy dog.",
             };
             SkPaint textPaint;
             textPaint.setAntiAlias(true);
             textPaint.setTextSize(SkIntToScalar(100));
             int posY = 0;
             for (unsigned i = 0; i < SK_ARRAY_COUNT(str); i++) {
                 posY += 100;
                 canvas->drawText(str[i], strlen(str[i]), SkIntToScalar(0),
                                  SkIntToScalar(posY), textPaint);
             }
             canvas->restore();
             canvas->restore();
         }
     }
 }

void SkScan::FillPath(const SkPath& path, const SkRegion& origClip,
                      SkBlitter* blitter) {
    if (origClip.isEmpty()) {
        return;
    }

    // Our edges are fixed-point, and don't like the bounds of the clip to
    // exceed that. Here we trim the clip just so we don't overflow later on
    const SkRegion* clipPtr = &origClip;
    SkRegion finiteClip;
    if (clip_to_limit(origClip, &finiteClip)) {
        if (finiteClip.isEmpty()) {
            return;
        }
        clipPtr = &finiteClip;
    }
    // don't reference "origClip" any more, just use clipPtr


    SkRect bounds = path.getBounds();
    bool irPreClipped = false;
    if (!SkRectPriv::MakeLargeS32().contains(bounds)) {
        if (!bounds.intersect(SkRectPriv::MakeLargeS32())) {
            bounds.setEmpty();
        }
        irPreClipped = true;
    }

    SkIRect ir = conservative_round_to_int(bounds);
    if (ir.isEmpty()) {
        if (path.isInverseFillType()) {
            blitter->blitRegion(*clipPtr);
        }
        return;
    }

    SkScanClipper clipper(blitter, clipPtr, ir, path.isInverseFillType(), irPreClipped);

    blitter = clipper.getBlitter();
    if (blitter) {
        // we have to keep our calls to blitter in sorted order, so we
        // must blit the above section first, then the middle, then the bottom.
        if (path.isInverseFillType()) {
            sk_blit_above(blitter, ir, *clipPtr);
        }
        SkASSERT(clipper.getClipRect() == nullptr ||
                *clipper.getClipRect() == clipPtr->getBounds());
        sk_fill_path(path, clipPtr->getBounds(), blitter, ir.fTop, ir.fBottom,
                     0, clipper.getClipRect() == nullptr);
        if (path.isInverseFillType()) {
            sk_blit_below(blitter, ir, *clipPtr);
        }
    } else {
        // what does it mean to not have a blitter if path.isInverseFillType???
    }
}

static void* draw_proc(void* context) {
    const int OVALW = 32;
    const int OVALH = 32;

    const SkBitmap* bm = static_cast<const SkBitmap*>(context);
    SkFlipPixelRef* ref = static_cast<SkFlipPixelRef*>(bm->pixelRef());

    const int DSCALE = 1;
    SkScalar    dx = SkIntToScalar(7) / DSCALE;
    SkScalar    dy = SkIntToScalar(5) / DSCALE;
    SkScalar    x = 0;
    SkScalar    y = 0;

    SkPaint paint;
    
    paint.setAntiAlias(true);
    paint.setColor(SK_ColorRED);
    
    SkRect oval;
    oval.setEmpty();

    while (!gDone) {
        ref->inval(oval, true);
        oval.set(x, y, x + SkIntToScalar(OVALW), y + SkIntToScalar(OVALH));
        ref->inval(oval, true);

        SkAutoFlipUpdate    update(ref);
        
        if (!update.dirty().isEmpty()) {
            // this must be local to the loop, since it needs to forget the pixels
            // its writing to after each iteration, since we do the swap
            SkCanvas    canvas(update.bitmap());

//            SkDebugf("----- dirty [%d %d %d %d]\n", dirty.getBounds().fLeft, dirty.getBounds().fTop, dirty.getBounds().width(), dirty.getBounds().height());
            canvas.clipRegion(update.dirty());
            
            canvas.drawColor(0, SkXfermode::kClear_Mode);            
            canvas.drawOval(oval, paint);
        }
        bounce(&x, &dx, WIDTH-OVALW);
        bounce(&y, &dy, HEIGHT-OVALH);
        
#if 1
        for (int i = 0; i < 1000; i++) {
            for (int j = 0; j < 10000; j++) {
                SkFixedMul(j, 10);
            }
        }
#endif
    }
    return NULL;
}

static jboolean getClipBounds(JNIEnv* env, jobject, jlong canvasHandle, jobject bounds) {
    SkRect   r;
    SkIRect ir;
    bool result = get_canvas(canvasHandle)->getClipBounds(&r);

    if (!result) {
        r.setEmpty();
    }
    r.round(&ir);

    (void)GraphicsJNI::irect_to_jrect(ir, env, bounds);
    return result ? JNI_TRUE : JNI_FALSE;
}

// Returns true if there is a rectangular clip, with the result in |deviceClipRect|.
static inline bool getDeviceClipAsRect(const GraphicsContext* context, SkRect& deviceClipRect)
{
    // Get the current clip in device coordinate space.
    if (context->canvas()->getClipType() != SkCanvas::kRect_ClipType)
        return false;

    SkIRect deviceClipIRect;
    if (context->canvas()->getClipDeviceBounds(&deviceClipIRect))
        deviceClipRect.set(deviceClipIRect);
    else
        deviceClipRect.setEmpty();

    return true;
}

void SkRecordDraw(const SkRecord& record,
                  SkCanvas* canvas,
                  SkPicture const* const drawablePicts[],
                  SkDrawable* const drawables[],
                  int drawableCount,
                  const SkBBoxHierarchy* bbh,
                  SkPicture::AbortCallback* callback) {
    SkAutoCanvasRestore saveRestore(canvas, true /*save now, restore at exit*/);

    if (bbh) {
        // Draw only ops that affect pixels in the canvas's current clip.
        // The SkRecord and BBH were recorded in identity space.  This canvas
        // is not necessarily in that same space.  getClipBounds() returns us
        // this canvas' clip bounds transformed back into identity space, which
        // lets us query the BBH.
        SkRect query;
        if (!canvas->getClipBounds(&query)) {
            query.setEmpty();
        }

        SkTDArray<int> ops;
        bbh->search(query, &ops);

        SkRecords::Draw draw(canvas, drawablePicts, drawables, drawableCount);
        for (int i = 0; i < ops.count(); i++) {
            if (callback && callback->abort()) {
                return;
            }
            // This visit call uses the SkRecords::Draw::operator() to call
            // methods on the |canvas|, wrapped by methods defined with the
            // DRAW() macro.
            record.visit(ops[i], draw);
        }
    } else {
        // Draw all ops.
        SkRecords::Draw draw(canvas, drawablePicts, drawables, drawableCount);
        for (int i = 0; i < record.count(); i++) {
            if (callback && callback->abort()) {
                return;
            }
            // This visit call uses the SkRecords::Draw::operator() to call
            // methods on the |canvas|, wrapped by methods defined with the
            // DRAW() macro.
            record.visit(i, draw);
        }
    }
}

static void* draw_proc(void* context) {
    const int OVALW = 32;
    const int OVALH = 32;

    const SkBitmap* bm = static_cast<const SkBitmap*>(context);
    SkFlipPixelRef* ref = static_cast<SkFlipPixelRef*>(bm->pixelRef());

    const int DSCALE = 1;
    SkScalar    dx = SkIntToScalar(7) / DSCALE;
    SkScalar    dy = SkIntToScalar(5) / DSCALE;
    SkScalar    x = 0;
    SkScalar    y = 0;

    SkPaint paint;

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

    SkRect oval;
    oval.setEmpty();

    SkRect clipR = SkRect::MakeWH(SkIntToScalar(bm->width()), SkIntToScalar(bm->height()));
    clipR.inset(SK_Scalar1/4, SK_Scalar1/4);

    while (!gDone) {
        ref->inval(oval, true);
        oval.set(x, y, x + SkIntToScalar(OVALW), y + SkIntToScalar(OVALH));
        ref->inval(oval, true);

        SkAutoFlipUpdate    update(ref);

        if (!update.dirty().isEmpty()) {
            // this must be local to the loop, since it needs to forget the pixels
            // its writing to after each iteration, since we do the swap
            SkCanvas    canvas(update.bitmap());
            canvas.clipRegion(update.dirty());
            canvas.drawColor(0, SkXfermode::kClear_Mode);
            canvas.clipRect(clipR, SkRegion::kIntersect_Op, true);

            canvas.drawOval(oval, paint);
        }
        bounce(&x, &dx, WIDTH-OVALW);
        bounce(&y, &dy, HEIGHT-OVALH);
    }
    return NULL;
}

void OpaqueRegionSkia::popCanvasLayer(const GraphicsContext* context)
{
    ASSERT(!m_canvasLayerStack.isEmpty());
    if (m_canvasLayerStack.isEmpty())
        return;

    const CanvasLayerState& canvasLayer = m_canvasLayerStack.last();
    SkRect layerOpaqueRect = canvasLayer.opaqueRect;
    SkPaint layerPaint = canvasLayer.paint;

    // Apply the image mask.
    if (canvasLayer.hasImageMask && !layerOpaqueRect.intersect(canvasLayer.imageOpaqueRect))
        layerOpaqueRect.setEmpty();

    m_canvasLayerStack.removeLast();

    applyOpaqueRegionFromLayer(context, layerOpaqueRect, layerPaint);
}

bool SkDrawPointsCommand::render(SkCanvas* canvas) const {
    canvas->clear(0xFFFFFFFF);
    canvas->save();

    SkRect bounds;

    bounds.setEmpty();
    for (unsigned int i = 0; i < fCount; ++i) {
        bounds.growToInclude(fPts[i].fX, fPts[i].fY);
    }

    xlate_and_scale_to_bounds(canvas, bounds);

    SkPaint p;
    p.setColor(SK_ColorBLACK);
    p.setStyle(SkPaint::kStroke_Style);

    canvas->drawPoints(fMode, fCount, fPts, p);
    canvas->restore();

    return true;
}

 Rec(int saveCount, const SkPath& path, SkRegion::Op op) : fPath(path) {
     fRect.setEmpty();
     fSaveCount = saveCount;
     fOp = op;
     fState = kPath_State;
 }

void SkClipStack::Element::updateBoundAndGenID(const Element* prior) {
    // We set this first here but we may overwrite it later if we determine that the clip is
    // either wide-open or empty.
    fGenID = GetNextGenID();

    // First, optimistically update the current Element's bound information
    // with the current clip's bound
    fIsIntersectionOfRects = false;
    switch (fType) {
        case kRect_Type:
            fFiniteBound = this->getRect();
            fFiniteBoundType = kNormal_BoundsType;

            if (SkRegion::kReplace_Op == fOp ||
                (SkRegion::kIntersect_Op == fOp && nullptr == prior) ||
                (SkRegion::kIntersect_Op == fOp && prior->fIsIntersectionOfRects &&
                    prior->rectRectIntersectAllowed(this->getRect(), fDoAA))) {
                fIsIntersectionOfRects = true;
            }
            break;
        case kRRect_Type:
            fFiniteBound = fRRect.getBounds();
            fFiniteBoundType = kNormal_BoundsType;
            break;
        case kPath_Type:
            fFiniteBound = fPath.get()->getBounds();

            if (fPath.get()->isInverseFillType()) {
                fFiniteBoundType = kInsideOut_BoundsType;
            } else {
                fFiniteBoundType = kNormal_BoundsType;
            }
            break;
        case kEmpty_Type:
            SkDEBUGFAIL("We shouldn't get here with an empty element.");
            break;
    }

    if (!fDoAA) {
        fFiniteBound.set(SkScalarFloorToScalar(fFiniteBound.fLeft+0.45f),
                         SkScalarRoundToScalar(fFiniteBound.fTop),
                         SkScalarRoundToScalar(fFiniteBound.fRight),
                         SkScalarRoundToScalar(fFiniteBound.fBottom));
    }

    // Now determine the previous Element's bound information taking into
    // account that there may be no previous clip
    SkRect prevFinite;
    SkClipStack::BoundsType prevType;

    if (nullptr == prior) {
        // no prior clip means the entire plane is writable
        prevFinite.setEmpty();   // there are no pixels that cannot be drawn to
        prevType = kInsideOut_BoundsType;
    } else {
        prevFinite = prior->fFiniteBound;
        prevType = prior->fFiniteBoundType;
    }

    FillCombo combination = kPrev_Cur_FillCombo;
    if (kInsideOut_BoundsType == fFiniteBoundType) {
        combination = (FillCombo) (combination | 0x01);
    }
    if (kInsideOut_BoundsType == prevType) {
        combination = (FillCombo) (combination | 0x02);
    }

    SkASSERT(kInvPrev_InvCur_FillCombo == combination ||
                kInvPrev_Cur_FillCombo == combination ||
                kPrev_InvCur_FillCombo == combination ||
                kPrev_Cur_FillCombo == combination);

    // Now integrate with clip with the prior clips
    switch (fOp) {
        case SkRegion::kDifference_Op:
            this->combineBoundsDiff(combination, prevFinite);
            break;
        case SkRegion::kXOR_Op:
            this->combineBoundsXOR(combination, prevFinite);
            break;
        case SkRegion::kUnion_Op:
            this->combineBoundsUnion(combination, prevFinite);
            break;
        case SkRegion::kIntersect_Op:
            this->combineBoundsIntersection(combination, prevFinite);
            break;
        case SkRegion::kReverseDifference_Op:
            this->combineBoundsRevDiff(combination, prevFinite);
            break;
        case SkRegion::kReplace_Op:
            // Replace just ignores everything prior
            // The current clip's bound information is already filled in
            // so nothing to do
            break;
        default:
            SkDebugf("SkRegion::Op error\n");
            SkASSERT(0);
            break;
    }
}