C++ SkRect::isEmpty方法代码示例

void draw(SkCanvas* canvas) {
    SkRect rect = SkRect::MakeLTRB(5, 35, 15, 25);
    SkDebugf("rect: %g, %g, %g, %g  isEmpty: %s\n", rect.left(), rect.top(), rect.right(),
              rect.bottom(), rect.isEmpty() ? "true" : "false");
    rect.sort();
    SkDebugf("rect: %g, %g, %g, %g  isEmpty: %s\n", rect.left(), rect.top(), rect.right(),
              rect.bottom(), rect.isEmpty() ? "true" : "false");
}

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);
}

sk_sp<SkPicture> SkPictureRecorder::finishRecordingAsPicture(uint32_t finishFlags) {
    fActivelyRecording = false;
    fRecorder->restoreToCount(1);  // If we were missing any restores, add them now.

    if (fRecord->count() == 0) {
        if (finishFlags & kReturnNullForEmpty_FinishFlag) {
            return nullptr;
        }
        return fMiniRecorder.detachAsPicture(fCullRect);
    }

    // TODO: delay as much of this work until just before first playback?
    SkRecordOptimize(fRecord);

    if (fRecord->count() == 0) {
        if (finishFlags & kReturnNullForEmpty_FinishFlag) {
            return nullptr;
        }
    }

    SkAutoTUnref<SkLayerInfo> saveLayerData;

    if (fBBH && (fFlags & kComputeSaveLayerInfo_RecordFlag)) {
        saveLayerData.reset(new SkLayerInfo);
    }

    SkDrawableList* drawableList = fRecorder->getDrawableList();
    SkBigPicture::SnapshotArray* pictList =
        drawableList ? drawableList->newDrawableSnapshot() : nullptr;

    if (fBBH.get()) {
        SkAutoTMalloc<SkRect> bounds(fRecord->count());
        if (saveLayerData) {
            SkRecordComputeLayers(fCullRect, *fRecord, bounds, pictList, saveLayerData);
        } else {
            SkRecordFillBounds(fCullRect, *fRecord, bounds);
        }
        fBBH->insert(bounds, fRecord->count());

        // Now that we've calculated content bounds, we can update fCullRect, often trimming it.
        // TODO: get updated fCullRect from bounds instead of forcing the BBH to return it?
        SkRect bbhBound = fBBH->getRootBound();
        SkASSERT((bbhBound.isEmpty() || fCullRect.contains(bbhBound))
            || (bbhBound.isEmpty() && fCullRect.isEmpty()));
        fCullRect = bbhBound;
    }

    size_t subPictureBytes = fRecorder->approxBytesUsedBySubPictures();
    for (int i = 0; pictList && i < pictList->count(); i++) {
        subPictureBytes += SkPictureUtils::ApproximateBytesUsed(pictList->begin()[i]);
    }
    return sk_make_sp<SkBigPicture>(fCullRect, fRecord.release(), pictList, fBBH.release(),
                            saveLayerData.release(), subPictureBytes);
}

void BitmapImage::draw(GraphicsContext* ctxt, const FloatRect& dstRect,
                       const FloatRect& srcRect, CompositeOperator compositeOp)
{
    startAnimation();

    SkBitmapRef* image = this->nativeImageForCurrentFrame();
    if (!image) { // If it's too early we won't have an image yet.
        return;
    }

    // in case we get called with an incomplete bitmap
    const SkBitmap& bitmap = image->bitmap();
    if (bitmap.getPixels() == NULL && bitmap.pixelRef() == NULL) {
#ifdef TRACE_SKIPPED_BITMAPS
        SkDebugf("----- skip bitmapimage: [%d %d] pixels %p pixelref %p\n",
                 bitmap.width(), bitmap.height(),
                 bitmap.getPixels(), bitmap.pixelRef());
#endif
        return;
    }

    SkIRect srcR;
    SkRect  dstR;    
    float invScaleX = (float)bitmap.width() / image->origWidth();
    float invScaleY = (float)bitmap.height() / image->origHeight();

    android_setrect(&dstR, dstRect);
    android_setrect_scaled(&srcR, srcRect, invScaleX, invScaleY);
    if (srcR.isEmpty() || dstR.isEmpty()) {
#ifdef TRACE_SKIPPED_BITMAPS
        SkDebugf("----- skip bitmapimage: [%d %d] src-empty %d dst-empty %d\n",
                 bitmap.width(), bitmap.height(),
                 srcR.isEmpty(), dstR.isEmpty());
#endif
        return;
    }

    SkCanvas*   canvas = ctxt->platformContext()->mCanvas;
    SkPaint     paint;

    paint.setFilterBitmap(true);
    paint.setPorterDuffXfermode(android_convert_compositeOp(compositeOp));
    canvas->drawBitmapRect(bitmap, &srcR, dstR, &paint);

#ifdef TRACE_SUBSAMPLED_BITMAPS
    if (bitmap.width() != image->origWidth() ||
        bitmap.height() != image->origHeight()) {
        SkDebugf("--- BitmapImage::draw [%d %d] orig [%d %d]\n",
                 bitmap.width(), bitmap.height(),
                 image->origWidth(), image->origHeight());
    }
#endif
}

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();
}

bool SkRect::intersect(const SkRect& a, const SkRect& b) {
    SkASSERT(&a && &b);

    if (!a.isEmpty() && !b.isEmpty() &&
        a.fLeft < b.fRight && b.fLeft < a.fRight &&
        a.fTop < b.fBottom && b.fTop < a.fBottom) {
        fLeft   = SkMaxScalar(a.fLeft,   b.fLeft);
        fTop    = SkMaxScalar(a.fTop,    b.fTop);
        fRight  = SkMinScalar(a.fRight,  b.fRight);
        fBottom = SkMinScalar(a.fBottom, b.fBottom);
        return true;
    }
    return false;
}

 void draw_fill(SkCanvas* canvas, const SkRect& rect, SkScalar width) {
     if (rect.isEmpty()) {
         return;
     }
     SkPaint paint;
     paint.setColor(0x1f1f0f0f);
     paint.setStyle(SkPaint::kStroke_Style);
     paint.setStrokeWidth(width);
     SkPath path;
     SkScalar maxSide = SkTMax(rect.width(), rect.height()) / 2;
     SkPoint center = { rect.fLeft + maxSide, rect.fTop + maxSide };
     path.addCircle(center.fX, center.fY, maxSide);
     canvas->drawPath(path, paint);
     paint.setStyle(SkPaint::kFill_Style);
     path.reset();
     path.addCircle(center.fX, center.fY, maxSide - width / 2);
     paint.setColor(0x3f0f1f3f);
     canvas->drawPath(path, paint);
     path.reset();
     path.setFillType(SkPath::kEvenOdd_FillType);
     path.addCircle(center.fX, center.fY, maxSide + width / 2);
     SkRect outside = SkRect::MakeXYWH(center.fX - maxSide - width, center.fY - maxSide - width, 
             (maxSide + width) * 2, (maxSide + width) * 2);
     path.addRect(outside);
     canvas->drawPath(path, paint);
 }

void SkRRect::setRectXY(const SkRect& rect, SkScalar xRad, SkScalar yRad) {
    if (rect.isEmpty() || !rect.isFinite()) {
        this->setEmpty();
        return;
    }

    if (!SkScalarsAreFinite(xRad, yRad)) {
        xRad = yRad = 0;    // devolve into a simple rect
    }
    if (xRad <= 0 || yRad <= 0) {
        // all corners are square in this case
        this->setRect(rect);
        return;
    }

    if (rect.width() < xRad+xRad || rect.height() < yRad+yRad) {
        SkScalar scale = SkMinScalar(rect.width() / (xRad + xRad), rect.height() / (yRad + yRad));
        SkASSERT(scale < SK_Scalar1);
        xRad = SkScalarMul(xRad, scale);
        yRad = SkScalarMul(yRad, scale);
    }

    fRect = rect;
    for (int i = 0; i < 4; ++i) {
        fRadii[i].set(xRad, yRad);
    }
    fType = kSimple_Type;
    if (xRad >= SkScalarHalf(fRect.width()) && yRad >= SkScalarHalf(fRect.height())) {
        fType = kOval_Type;
        // TODO: assert that all the x&y radii are already W/2 & H/2
    }

    SkDEBUGCODE(this->validate();)
}

SkClipStack::SkClipStack(const SkRect& r)
    : fDeque(sizeof(Element), kDefaultElementAllocCnt)
    , fSaveCount(0) {
    if (!r.isEmpty()) {
        this->clipDevRect(r, SkRegion::kReplace_Op, false);
    }
}

bool SkBBoxRecord::transformBounds(const SkRect& bounds, const SkPaint* paint) {
    SkRect outBounds = bounds;
    outBounds.sort();

    if (paint) {
        // account for stroking, path effects, shadows, etc
        if (paint->canComputeFastBounds()) {
            SkRect temp;
            outBounds = paint->computeFastBounds(outBounds, &temp);
        } else {
            // set bounds to current clip
            if (!this->getClipBounds(&outBounds)) {
                // current clip is empty
                return false;
            }
        }
    }

    if (!outBounds.isEmpty() && !this->quickReject(outBounds)) {
        this->getTotalMatrix().mapRect(&outBounds);
        this->handleBBox(outBounds);
        return true;
    }

    return false;
}

void OpaqueRegionSkia::applyOpaqueRegionFromLayer(const GraphicsContext* context, const SkRect& layerOpaqueRect, const SkPaint& paint)
{
    SkRect deviceClipRect;
    bool deviceClipIsARect = getDeviceClipAsRect(context, deviceClipRect);

    if (deviceClipRect.isEmpty())
        return;

    SkRect sourceOpaqueRect = layerOpaqueRect;
    // Save the opaque area in the destination, so we can preserve the parts of it under the source opaque area if possible.
    SkRect destinationOpaqueRect = currentTrackingOpaqueRect();

    bool outsideSourceOpaqueRectPreservesOpaque = xfermodePreservesOpaque(paint, false);
    if (!outsideSourceOpaqueRectPreservesOpaque)
        markRectAsNonOpaque(deviceClipRect);

    if (!deviceClipIsARect)
        return;
    if (!sourceOpaqueRect.intersect(deviceClipRect))
        return;

    bool sourceOpaqueRectDrawsOpaque = paintIsOpaque(paint, FillOnly, 0);
    bool sourceOpaqueRectXfersOpaque = xfermodeIsOpaque(paint, sourceOpaqueRectDrawsOpaque);
    bool sourceOpaqueRectPreservesOpaque = xfermodePreservesOpaque(paint, sourceOpaqueRectDrawsOpaque);

    // If the layer's opaque area is being drawn opaque in the layer below, then mark it opaque. Otherwise,
    // if it preserves opaque then keep the intersection of the two.
    if (sourceOpaqueRectXfersOpaque)
        markRectAsOpaque(sourceOpaqueRect);
    else if (sourceOpaqueRectPreservesOpaque && sourceOpaqueRect.intersect(destinationOpaqueRect))
        markRectAsOpaque(sourceOpaqueRect);
}

void SkTileGrid::insert(void* data, const SkRect& fbounds, bool) {
    SkASSERT(!fbounds.isEmpty());
    SkIRect dilatedBounds;
    if (fbounds.isLargest()) {
        // Dilating the largest SkIRect will overflow.  Other nearly-largest rects may overflow too,
        // but we don't make active use of them like we do the largest.
        dilatedBounds.setLargest();
    } else {
        fbounds.roundOut(&dilatedBounds);
        dilatedBounds.outset(fInfo.fMargin.width(), fInfo.fMargin.height());
        dilatedBounds.offset(fInfo.fOffset);
    }

    const SkIRect gridBounds =
        { 0, 0, fInfo.fTileInterval.width() * fXTiles, fInfo.fTileInterval.height() * fYTiles };
    if (!SkIRect::Intersects(dilatedBounds, gridBounds)) {
        return;
    }

    // Note: SkIRects are non-inclusive of the right() column and bottom() row,
    // hence the "-1"s in the computations of maxX and maxY.
    int minX = SkMax32(0, SkMin32(dilatedBounds.left() / fInfo.fTileInterval.width(), fXTiles - 1));
    int minY = SkMax32(0, SkMin32(dilatedBounds.top() / fInfo.fTileInterval.height(), fYTiles - 1));
    int maxX = SkMax32(0, SkMin32((dilatedBounds.right()  - 1) / fInfo.fTileInterval.width(),
                                  fXTiles - 1));
    int maxY = SkMax32(0, SkMin32((dilatedBounds.bottom() - 1) / fInfo.fTileInterval.height(),
                                  fYTiles - 1));

    Entry entry = { fCount++, data };
    for (int y = minY; y <= maxY; y++) {
        for (int x = minX; x <= maxX; x++) {
            fTiles[y * fXTiles + x].push(entry);
        }
    }
}

bool EglManager::swapBuffers(const Frame& frame, const SkRect& screenDirty) {
    if (CC_UNLIKELY(Properties::waitForGpuCompletion)) {
        ATRACE_NAME("Finishing GPU work");
        fence();
    }

    EGLint rects[4];
    frame.map(screenDirty, rects);
    eglSwapBuffersWithDamageKHR(mEglDisplay, frame.mSurface, rects, screenDirty.isEmpty() ? 0 : 1);

    EGLint err = eglGetError();
    if (CC_LIKELY(err == EGL_SUCCESS)) {
        return true;
    }
    if (err == EGL_BAD_SURFACE || err == EGL_BAD_NATIVE_WINDOW) {
        // For some reason our surface was destroyed out from under us
        // This really shouldn't happen, but if it does we can recover easily
        // by just not trying to use the surface anymore
        ALOGW("swapBuffers encountered EGL error %d on %p, halting rendering...", err,
              frame.mSurface);
        return false;
    }
    LOG_ALWAYS_FATAL("Encountered EGL error %d %s during rendering", err, egl_error_str(err));
    // Impossible to hit this, but the compiler doesn't know that
    return false;
}

void SkRRect::setNinePatch(const SkRect& rect, SkScalar leftRad, SkScalar topRad,
                           SkScalar rightRad, SkScalar bottomRad) {
    if (rect.isEmpty() || !rect.isFinite()) {
        this->setEmpty();
        return;
    }

    const SkScalar array[4] = { leftRad, topRad, rightRad, bottomRad };
    if (!SkScalarsAreFinite(array, 4)) {
        this->setRect(rect);    // devolve into a simple rect
        return;
    }

    leftRad = SkMaxScalar(leftRad, 0);
    topRad = SkMaxScalar(topRad, 0);
    rightRad = SkMaxScalar(rightRad, 0);
    bottomRad = SkMaxScalar(bottomRad, 0);

    SkScalar scale = SK_Scalar1;
    if (leftRad + rightRad > rect.width()) {
        scale = rect.width() / (leftRad + rightRad);
    }
    if (topRad + bottomRad > rect.height()) {
        scale = SkMinScalar(scale, rect.height() / (topRad + bottomRad));
    }

    if (scale < SK_Scalar1) {
        leftRad = SkScalarMul(leftRad, scale);
        topRad = SkScalarMul(topRad, scale);
        rightRad = SkScalarMul(rightRad, scale);
        bottomRad = SkScalarMul(bottomRad, scale);
    }

    if (leftRad == rightRad && topRad == bottomRad) {
        if (leftRad >= SkScalarHalf(rect.width()) && topRad >= SkScalarHalf(rect.height())) {
            fType = kOval_Type;
        } else if (0 == leftRad || 0 == topRad) {
            // If the left and (by equality check above) right radii are zero then it is a rect.
            // Same goes for top/bottom.
            fType = kRect_Type;
            leftRad = 0;
            topRad = 0;
            rightRad = 0;
            bottomRad = 0;
        } else {
            fType = kSimple_Type;
        }
    } else {
        fType = kNinePatch_Type;
    }

    fRect = rect;
    fRadii[kUpperLeft_Corner].set(leftRad, topRad);
    fRadii[kUpperRight_Corner].set(rightRad, topRad);
    fRadii[kLowerRight_Corner].set(rightRad, bottomRad);
    fRadii[kLowerLeft_Corner].set(leftRad, bottomRad);

    SkDEBUGCODE(this->validate();)
}

bool SkHitTestPath(const SkPath& path, SkRect& target, bool hires) {
    if (target.isEmpty()) {
        return false;
    }

    bool isInverse = path.isInverseFillType();
    if (path.isEmpty()) {
        return isInverse;
    }

    SkRect bounds = path.getBounds();

    bool sects = SkRect::Intersects(target, bounds);
    if (isInverse) {
        if (!sects) {
            return true;
        }
    } else {
        if (!sects) {
            return false;
        }
        if (target.contains(bounds)) {
            return true;
        }
    }

    SkPath devPath;
    const SkPath* pathPtr;
    SkRect        devTarget;

    if (hires) {
        const SkScalar coordLimit = SkIntToScalar(16384);
        const SkRect limit = { 0, 0, coordLimit, coordLimit };
        
        SkMatrix matrix;
        matrix.setRectToRect(bounds, limit, SkMatrix::kFill_ScaleToFit);

        path.transform(matrix, &devPath);
        matrix.mapRect(&devTarget, target);

        pathPtr = &devPath;
    } else {
        devTarget = target;
        pathPtr = &path;
    }

    SkIRect iTarget;
    devTarget.round(&iTarget);
    if (iTarget.isEmpty()) {
        iTarget.fLeft = SkScalarFloorToInt(devTarget.fLeft);
        iTarget.fTop = SkScalarFloorToInt(devTarget.fTop);
        iTarget.fRight = iTarget.fLeft + 1;
        iTarget.fBottom = iTarget.fTop + 1;
    }

    SkRegion clip(iTarget);
    SkRegion rgn;
    return rgn.setPath(*pathPtr, clip) ^ isInverse;
}