C++ SkIRect::height方法代码示例

static void check(skiatest::Reporter* r,
                  const char path[],
                  SkISize size,
                  bool supportsScanlineDecoding,
                  bool supportsSubsetDecoding,
                  bool supports565 = true) {
    SkAutoTDelete<SkStream> stream(resource(path));
    if (!stream) {
        SkDebugf("Missing resource '%s'\n", path);
        return;
    }
    SkAutoTDelete<SkCodec> codec(SkCodec::NewFromStream(stream.detach()));
    if (!codec) {
        ERRORF(r, "Unable to decode '%s'", path);
        return;
    }

    // This test is used primarily to verify rewinding works properly.  Using kN32 allows
    // us to test this without the added overhead of creating different bitmaps depending
    // on the color type (ex: building a color table for kIndex8).  DM is where we test
    // decodes to all possible destination color types.
    SkImageInfo info = codec->getInfo().makeColorType(kN32_SkColorType);
    REPORTER_ASSERT(r, info.dimensions() == size);

    {
        // Test decoding to 565
        SkImageInfo info565 = info.makeColorType(kRGB_565_SkColorType);
        SkCodec::Result expected = (supports565 && info.alphaType() == kOpaque_SkAlphaType) ?
                SkCodec::kSuccess : SkCodec::kInvalidConversion;
        test_info(r, codec, info565, expected, nullptr);
    }

    SkBitmap bm;
    bm.allocPixels(info);
    SkAutoLockPixels autoLockPixels(bm);
    SkCodec::Result result =
        codec->getPixels(info, bm.getPixels(), bm.rowBytes(), nullptr, nullptr, nullptr);
    REPORTER_ASSERT(r, result == SkCodec::kSuccess);

    SkMD5::Digest digest;
    md5(bm, &digest);

    // verify that re-decoding gives the same result.
    test_info(r, codec, info, SkCodec::kSuccess, &digest);

    {
        // Check alpha type conversions
        if (info.alphaType() == kOpaque_SkAlphaType) {
            test_info(r, codec, info.makeAlphaType(kUnpremul_SkAlphaType),
                      SkCodec::kInvalidConversion, nullptr);
            test_info(r, codec, info.makeAlphaType(kPremul_SkAlphaType),
                      SkCodec::kInvalidConversion, nullptr);
        } else {
            // Decoding to opaque should fail
            test_info(r, codec, info.makeAlphaType(kOpaque_SkAlphaType),
                      SkCodec::kInvalidConversion, nullptr);
            SkAlphaType otherAt = info.alphaType();
            if (kPremul_SkAlphaType == otherAt) {
                otherAt = kUnpremul_SkAlphaType;
            } else {
                otherAt = kPremul_SkAlphaType;
            }
            // The other non-opaque alpha type should always succeed, but not match.
            test_info(r, codec, info.makeAlphaType(otherAt), SkCodec::kSuccess, nullptr);
        }
    }

    // Scanline decoding follows.

    stream.reset(resource(path));
    SkAutoTDelete<SkScanlineDecoder> scanlineDecoder(
            SkScanlineDecoder::NewFromStream(stream.detach()));
    if (supportsScanlineDecoding) {
        bm.eraseColor(SK_ColorYELLOW);
        REPORTER_ASSERT(r, scanlineDecoder);

        REPORTER_ASSERT(r, scanlineDecoder->start(info) == SkCodec::kSuccess);

        for (int y = 0; y < info.height(); y++) {
            result = scanlineDecoder->getScanlines(bm.getAddr(0, y), 1, 0);
            REPORTER_ASSERT(r, result == SkCodec::kSuccess);
        }
        // verify that scanline decoding gives the same result.
        if (SkScanlineDecoder::kTopDown_SkScanlineOrder == scanlineDecoder->getScanlineOrder()) {
            compare_to_good_digest(r, digest, bm);
        }
    } else {
        REPORTER_ASSERT(r, !scanlineDecoder);
    }

    // The rest of this function tests decoding subsets, and will decode an arbitrary number of
    // random subsets.
    // Do not attempt to decode subsets of an image of only once pixel, since there is no
    // meaningful subset.
    if (size.width() * size.height() == 1) {
        return;
    }

    SkRandom rand;
    SkIRect subset;
//.........这里部分代码省略.........

// Get the margin (aka perimeter)
static inline uint32_t get_margin(const SkIRect& rect) {
    return 2 * (rect.width() + rect.height());
}

SkLatticeIter::SkLatticeIter(const SkCanvas::Lattice& lattice, const SkRect& dst) {
    const int* xDivs = lattice.fXDivs;
    const int origXCount = lattice.fXCount;
    const int* yDivs = lattice.fYDivs;
    const int origYCount = lattice.fYCount;
    SkASSERT(lattice.fBounds);
    const SkIRect src = *lattice.fBounds;

    // In the x-dimension, the first rectangle always starts at x = 0 and is "scalable".
    // If xDiv[0] is 0, it indicates that the first rectangle is degenerate, so the
    // first real rectangle "scalable" in the x-direction.
    //
    // The same interpretation applies to the y-dimension.
    //
    // As we move left to right across the image, alternating patches will be "fixed" or
    // "scalable" in the x-direction.  Similarly, as move top to bottom, alternating
    // patches will be "fixed" or "scalable" in the y-direction.
    int xCount = origXCount;
    int yCount = origYCount;
    bool xIsScalable = (xCount > 0 && src.fLeft == xDivs[0]);
    if (xIsScalable) {
        // Once we've decided that the first patch is "scalable", we don't need the
        // xDiv.  It is always implied that we start at the edge of the bounds.
        xDivs++;
        xCount--;
    }
    bool yIsScalable = (yCount > 0 && src.fTop == yDivs[0]);
    if (yIsScalable) {
        // Once we've decided that the first patch is "scalable", we don't need the
        // yDiv.  It is always implied that we start at the edge of the bounds.
        yDivs++;
        yCount--;
    }

    // Count "scalable" and "fixed" pixels in each dimension.
    int xCountScalable = count_scalable_pixels(xDivs, xCount, xIsScalable, src.fLeft, src.fRight);
    int xCountFixed = src.width() - xCountScalable;
    int yCountScalable = count_scalable_pixels(yDivs, yCount, yIsScalable, src.fTop, src.fBottom);
    int yCountFixed = src.height() - yCountScalable;

    fSrcX.reset(xCount + 2);
    fDstX.reset(xCount + 2);
    set_points(fDstX.begin(), fSrcX.begin(), xDivs, xCount, xCountFixed, xCountScalable,
               src.fLeft, src.fRight, dst.fLeft, dst.fRight, xIsScalable);

    fSrcY.reset(yCount + 2);
    fDstY.reset(yCount + 2);
    set_points(fDstY.begin(), fSrcY.begin(), yDivs, yCount, yCountFixed, yCountScalable,
               src.fTop, src.fBottom, dst.fTop, dst.fBottom, yIsScalable);

    fCurrX = fCurrY = 0;
    fNumRectsInLattice = (xCount + 1) * (yCount + 1);
    fNumRectsToDraw = fNumRectsInLattice;

    if (lattice.fFlags) {
        fFlags.push_back_n(fNumRectsInLattice);

        const SkCanvas::Lattice::Flags* flags = lattice.fFlags;

        bool hasPadRow = (yCount != origYCount);
        bool hasPadCol = (xCount != origXCount);
        if (hasPadRow) {
            // The first row of rects are all empty, skip the first row of flags.
            flags += origXCount + 1;
        }

        int i = 0;
        for (int y = 0; y < yCount + 1; y++) {
            for (int x = 0; x < origXCount + 1; x++) {
                if (0 == x && hasPadCol) {
                    // The first column of rects are all empty.  Skip a rect.
                    flags++;
                    continue;
                }

                fFlags[i] = *flags;
                flags++;
                i++;
            }
        }

        for (int j = 0; j < fFlags.count(); j++) {
            if (SkCanvas::Lattice::kTransparent_Flags == fFlags[j]) {
                fNumRectsToDraw--;
            }
        }
    }
}

static void draw_nine_clipped(const SkMask& mask, const SkIRect& outerR,
                              const SkIPoint& center, bool fillCenter,
                              const SkIRect& clipR, SkBlitter* blitter) {
    int cx = center.x();
    int cy = center.y();
    SkMask m;

    // top-left
    m.fBounds = mask.fBounds;
    m.fBounds.fRight = cx;
    m.fBounds.fBottom = cy;
    extractMaskSubset(mask, &m);
    m.fBounds.offsetTo(outerR.left(), outerR.top());
    blitClippedMask(blitter, m, m.fBounds, clipR);

    // top-right
    m.fBounds = mask.fBounds;
    m.fBounds.fLeft = cx + 1;
    m.fBounds.fBottom = cy;
    extractMaskSubset(mask, &m);
    m.fBounds.offsetTo(outerR.right() - m.fBounds.width(), outerR.top());
    blitClippedMask(blitter, m, m.fBounds, clipR);

    // bottom-left
    m.fBounds = mask.fBounds;
    m.fBounds.fRight = cx;
    m.fBounds.fTop = cy + 1;
    extractMaskSubset(mask, &m);
    m.fBounds.offsetTo(outerR.left(), outerR.bottom() - m.fBounds.height());
    blitClippedMask(blitter, m, m.fBounds, clipR);

    // bottom-right
    m.fBounds = mask.fBounds;
    m.fBounds.fLeft = cx + 1;
    m.fBounds.fTop = cy + 1;
    extractMaskSubset(mask, &m);
    m.fBounds.offsetTo(outerR.right() - m.fBounds.width(),
                       outerR.bottom() - m.fBounds.height());
    blitClippedMask(blitter, m, m.fBounds, clipR);

    SkIRect innerR;
    innerR.set(outerR.left() + cx - mask.fBounds.left(),
               outerR.top() + cy - mask.fBounds.top(),
               outerR.right() + (cx + 1 - mask.fBounds.right()),
               outerR.bottom() + (cy + 1 - mask.fBounds.bottom()));
    if (fillCenter) {
        blitClippedRect(blitter, innerR, clipR);
    }

    const int innerW = innerR.width();
    size_t storageSize = (innerW + 1) * (sizeof(int16_t) + sizeof(uint8_t));
    SkAutoSMalloc<4*1024> storage(storageSize);
    int16_t* runs = (int16_t*)storage.get();
    uint8_t* alpha = (uint8_t*)(runs + innerW + 1);

    SkIRect r;
    // top
    r.set(innerR.left(), outerR.top(), innerR.right(), innerR.top());
    if (r.intersect(clipR)) {
        int startY = SkMax32(0, r.top() - outerR.top());
        int stopY = startY + r.height();
        int width = r.width();
        for (int y = startY; y < stopY; ++y) {
            runs[0] = width;
            runs[width] = 0;
            alpha[0] = *mask.getAddr8(cx, mask.fBounds.top() + y);
            blitter->blitAntiH(r.left(), outerR.top() + y, alpha, runs);
        }
    }
    // bottom
    r.set(innerR.left(), innerR.bottom(), innerR.right(), outerR.bottom());
    if (r.intersect(clipR)) {
        int startY = outerR.bottom() - r.bottom();
        int stopY = startY + r.height();
        int width = r.width();
        for (int y = startY; y < stopY; ++y) {
            runs[0] = width;
            runs[width] = 0;
            alpha[0] = *mask.getAddr8(cx, mask.fBounds.bottom() - y - 1);
            blitter->blitAntiH(r.left(), outerR.bottom() - y - 1, alpha, runs);
        }
    }
    // left
    r.set(outerR.left(), innerR.top(), innerR.left(), innerR.bottom());
    if (r.intersect(clipR)) {
        int startX = r.left() - outerR.left();
        int stopX = startX + r.width();
        int height = r.height();
        for (int x = startX; x < stopX; ++x) {
            blitter->blitV(outerR.left() + x, r.top(), height,
                           *mask.getAddr8(mask.fBounds.left() + x, mask.fBounds.top() + cy));
        }
    }
    // right
    r.set(innerR.right(), innerR.top(), outerR.right(), innerR.bottom());
    if (r.intersect(clipR)) {
        int startX = outerR.right() - r.right();
        int stopX = startX + r.width();
        int height = r.height();
        for (int x = startX; x < stopX; ++x) {
//.........这里部分代码省略.........

bool SkMorphologyImageFilter::filterImageGeneric(SkMorphologyImageFilter::Proc procX,
                                                 SkMorphologyImageFilter::Proc procY,
                                                 Proxy* proxy,
                                                 const SkBitmap& source,
                                                 const Context& ctx,
                                                 SkBitmap* dst,
                                                 SkIPoint* offset) const {
    SkBitmap src = source;
    SkIPoint srcOffset = SkIPoint::Make(0, 0);
    if (getInput(0) && !getInput(0)->filterImage(proxy, source, ctx, &src, &srcOffset)) {
        return false;
    }

    if (src.colorType() != kN32_SkColorType) {
        return false;
    }

    SkIRect bounds;
    if (!this->applyCropRect(ctx, proxy, src, &srcOffset, &bounds, &src)) {
        return false;
    }

    SkAutoLockPixels alp(src);
    if (!src.getPixels()) {
        return false;
    }

    if (!dst->tryAllocPixels(src.info().makeWH(bounds.width(), bounds.height()))) {
        return false;
    }

    SkVector radius = SkVector::Make(SkIntToScalar(this->radius().width()),
                                     SkIntToScalar(this->radius().height()));
    ctx.ctm().mapVectors(&radius, 1);
    int width = SkScalarFloorToInt(radius.fX);
    int height = SkScalarFloorToInt(radius.fY);

    if (width < 0 || height < 0) {
        return false;
    }

    SkIRect srcBounds = bounds;
    srcBounds.offset(-srcOffset);

    if (width == 0 && height == 0) {
        src.extractSubset(dst, srcBounds);
        offset->fX = bounds.left();
        offset->fY = bounds.top();
        return true;
    }

    SkBitmap temp;
    if (!temp.tryAllocPixels(dst->info())) {
        return false;
    }

    if (width > 0 && height > 0) {
        callProcX(procX, src, &temp, width, srcBounds);
        SkIRect tmpBounds = SkIRect::MakeWH(srcBounds.width(), srcBounds.height());
        callProcY(procY, temp, dst, height, tmpBounds);
    } else if (width > 0) {
        callProcX(procX, src, dst, width, srcBounds);
    } else if (height > 0) {
        callProcY(procY, src, dst, height, srcBounds);
    }
    offset->fX = bounds.left();
    offset->fY = bounds.top();
    return true;
}

void Image::drawPattern(GraphicsContext* context,
                        const FloatRect& floatSrcRect,
                        const AffineTransform& patternTransform,
                        const FloatPoint& phase,
                        ColorSpace styleColorSpace,
                        CompositeOperator compositeOp,
                        const FloatRect& destRect)
{
    FloatRect normSrcRect = normalizeRect(floatSrcRect);
    if (destRect.isEmpty() || normSrcRect.isEmpty())
        return; // nothing to draw

    NativeImageSkia* bitmap = nativeImageForCurrentFrame();
    if (!bitmap)
        return;

    SkIRect srcRect = enclosingIntRect(normSrcRect);

    // Figure out what size the bitmap will be in the destination. The
    // destination rect is the bounds of the pattern, we need to use the
    // matrix to see how big it will be.
    float destBitmapWidth, destBitmapHeight;
    TransformDimensions(patternTransform, srcRect.width(), srcRect.height(),
                        &destBitmapWidth, &destBitmapHeight);

    // Compute the resampling mode.
    ResamplingMode resampling;
    if (context->platformContext()->isAccelerated() || context->platformContext()->printing())
        resampling = RESAMPLE_LINEAR;
    else
        resampling = computeResamplingMode(context->platformContext(), *bitmap, srcRect.width(), srcRect.height(), destBitmapWidth, destBitmapHeight);

    // Load the transform WebKit requested.
    SkMatrix matrix(patternTransform);

    SkShader* shader;
    if (resampling == RESAMPLE_AWESOME) {
        // Do nice resampling.
        int width = static_cast<int>(destBitmapWidth);
        int height = static_cast<int>(destBitmapHeight);
        SkBitmap resampled = bitmap->resizedBitmap(srcRect, width, height);
        shader = SkShader::CreateBitmapShader(resampled, SkShader::kRepeat_TileMode, SkShader::kRepeat_TileMode);

        // Since we just resized the bitmap, we need to undo the scale set in
        // the image transform.
        matrix.setScaleX(SkIntToScalar(1));
        matrix.setScaleY(SkIntToScalar(1));
    } else {
        // No need to do nice resampling.
        SkBitmap srcSubset;
        bitmap->bitmap().extractSubset(&srcSubset, srcRect);
        shader = SkShader::CreateBitmapShader(srcSubset, SkShader::kRepeat_TileMode, SkShader::kRepeat_TileMode);
    }

    // We also need to translate it such that the origin of the pattern is the
    // origin of the destination rect, which is what WebKit expects. Skia uses
    // the coordinate system origin as the base for the patter. If WebKit wants
    // a shifted image, it will shift it from there using the patternTransform.
    float adjustedX = phase.x() + normSrcRect.x() *
                      narrowPrecisionToFloat(patternTransform.a());
    float adjustedY = phase.y() + normSrcRect.y() *
                      narrowPrecisionToFloat(patternTransform.d());
    matrix.postTranslate(SkFloatToScalar(adjustedX),
                         SkFloatToScalar(adjustedY));
    shader->setLocalMatrix(matrix);

    SkPaint paint;
    paint.setShader(shader)->unref();
    paint.setXfermodeMode(WebCoreCompositeToSkiaComposite(compositeOp));
    paint.setFilterBitmap(resampling == RESAMPLE_LINEAR);

    context->platformContext()->paintSkPaint(destRect, paint);
}

static SkBitmap unpremultiply_bitmap(const SkBitmap& bitmap,
                                     const SkIRect& srcRect) {
    SkBitmap outBitmap;
    outBitmap.allocPixels(bitmap.info().makeWH(srcRect.width(), srcRect.height()));
    int dstRow = 0;

    SkAutoLockPixels outBitmapPixelLock(outBitmap);
    SkAutoLockPixels bitmapPixelLock(bitmap);
    switch (bitmap.colorType()) {
        case kARGB_4444_SkColorType: {
            for (int y = srcRect.fTop; y < srcRect.fBottom; y++) {
                uint16_t* dst = outBitmap.getAddr16(0, dstRow);
                uint16_t* src = bitmap.getAddr16(0, y);
                for (int x = srcRect.fLeft; x < srcRect.fRight; x++) {
                    uint8_t a = SkGetPackedA4444(src[x]);
                    // It is necessary to average the color component of
                    // transparent pixels with their surrounding neighbors
                    // since the PDF renderer may separately re-sample the
                    // alpha and color channels when the image is not
                    // displayed at its native resolution. Since an alpha of
                    // zero gives no information about the color component,
                    // the pathological case is a white image with sharp
                    // transparency bounds - the color channel goes to black,
                    // and the should-be-transparent pixels are rendered
                    // as grey because of the separate soft mask and color
                    // resizing.
                    if (a == (SK_AlphaTRANSPARENT & 0x0F)) {
                        *dst = get_argb4444_neighbor_avg_color(bitmap, x, y);
                    } else {
                        *dst = remove_alpha_argb4444(src[x]);
                    }
                    dst++;
                }
                dstRow++;
            }
            break;
        }
        case kN32_SkColorType: {
            for (int y = srcRect.fTop; y < srcRect.fBottom; y++) {
                uint32_t* dst = outBitmap.getAddr32(0, dstRow);
                uint32_t* src = bitmap.getAddr32(0, y);
                for (int x = srcRect.fLeft; x < srcRect.fRight; x++) {
                    uint8_t a = SkGetPackedA32(src[x]);
                    if (a == SK_AlphaTRANSPARENT) {
                        *dst = get_argb8888_neighbor_avg_color(bitmap, x, y);
                    } else {
                        *dst = remove_alpha_argb8888(src[x]);
                    }
                    dst++;
                }
                dstRow++;
            }
            break;
        }
        default:
            SkASSERT(false);
    }

    outBitmap.setImmutable();

    return outBitmap;
}

DEF_TEST(CanvasState_test_complex_clips, reporter) {
    const int WIDTH = 400;
    const int HEIGHT = 400;
    const int SPACER = 10;

    SkIRect layerRect = SkIRect::MakeWH(WIDTH, HEIGHT / 4);
    layerRect.inset(2*SPACER, 2*SPACER);

    SkIRect clipRect = layerRect;
    clipRect.fRight = clipRect.fLeft + (clipRect.width() / 2) - (2*SPACER);
    clipRect.outset(SPACER, SPACER);

    SkIRect regionBounds = clipRect;
    regionBounds.offset(clipRect.width() + (2*SPACER), 0);

    SkIRect regionInterior = regionBounds;
    regionInterior.inset(SPACER*3, SPACER*3);

    SkRegion clipRegion;
    clipRegion.setRect(regionBounds);
    clipRegion.op(regionInterior, SkRegion::kDifference_Op);


    const SkRegion::Op clipOps[] = { SkRegion::kIntersect_Op,
                                     SkRegion::kIntersect_Op,
                                     SkRegion::kReplace_Op,
    };
    const SkCanvas::SaveFlags flags[] = { SkCanvas::kARGB_NoClipLayer_SaveFlag,
                                          SkCanvas::kARGB_ClipLayer_SaveFlag,
                                          SkCanvas::kARGB_NoClipLayer_SaveFlag,
    };
    REPORTER_ASSERT(reporter, sizeof(clipOps) == sizeof(flags));

    bool (*drawFn)(SkCanvasState* state, int32_t l, int32_t t,
                   int32_t r, int32_t b, int32_t clipOp,
                   int32_t regionRects, int32_t* rectCoords);

    OpenLibResult openLibResult(reporter);
    if (openLibResult.handle() != NULL) {
        *(void**) (&drawFn) = dlsym(openLibResult.handle(),
                                    "complex_clips_draw_from_canvas_state");
    } else {
        drawFn = complex_clips_draw_from_canvas_state;
    }

    REPORTER_ASSERT(reporter, drawFn);
    if (!drawFn) {
        return;
    }

    SkBitmap bitmaps[2];
    for (int i = 0; i < 2; ++i) {
        bitmaps[i].allocN32Pixels(WIDTH, HEIGHT);

        SkCanvas canvas(bitmaps[i]);

        canvas.drawColor(SK_ColorRED);

        SkRegion localRegion = clipRegion;

        for (size_t j = 0; j < SK_ARRAY_COUNT(flags); ++j) {
            SkRect layerBounds = SkRect::Make(layerRect);
            canvas.saveLayerAlpha(&layerBounds, 128, flags[j]);

            if (i) {
                SkCanvasState* state = SkCanvasStateUtils::CaptureCanvasState(&canvas);
                REPORTER_ASSERT(reporter, state);

                SkRegion::Iterator iter(localRegion);
                SkTDArray<int32_t> rectCoords;
                for (; !iter.done(); iter.next()) {
                    const SkIRect& rect = iter.rect();
                    *rectCoords.append() = rect.fLeft;
                    *rectCoords.append() = rect.fTop;
                    *rectCoords.append() = rect.fRight;
                    *rectCoords.append() = rect.fBottom;
                }
                bool success = drawFn(state, clipRect.fLeft, clipRect.fTop,
                                      clipRect.fRight, clipRect.fBottom, clipOps[j],
                                      rectCoords.count() / 4, rectCoords.begin());
                REPORTER_ASSERT(reporter, success);

                SkCanvasStateUtils::ReleaseCanvasState(state);
            } else {
                complex_clips_draw(&canvas, clipRect.fLeft, clipRect.fTop,
                                   clipRect.fRight, clipRect.fBottom, clipOps[j],
                                   localRegion);
            }

            canvas.restore();

            // translate the canvas and region for the next iteration
            canvas.translate(0, SkIntToScalar(2*(layerRect.height() + (SPACER))));
            localRegion.translate(0, 2*(layerRect.height() + SPACER));
        }
    }

    // now we memcmp the two bitmaps
    REPORTER_ASSERT(reporter, bitmaps[0].getSize() == bitmaps[1].getSize());
    REPORTER_ASSERT(reporter, !memcmp(bitmaps[0].getPixels(),
//.........这里部分代码省略.........

static void test_complex_clips(skiatest::Reporter* reporter) {
#ifdef SK_SUPPORT_LEGACY_CLIPTOLAYERFLAG
    const int WIDTH = 400;
    const int HEIGHT = 400;
    const int SPACER = 10;

    SkIRect layerRect = SkIRect::MakeWH(WIDTH, HEIGHT / 4);
    layerRect.inset(2*SPACER, 2*SPACER);

    SkIRect clipRect = layerRect;
    clipRect.fRight = clipRect.fLeft + (clipRect.width() / 2) - (2*SPACER);
    clipRect.outset(SPACER, SPACER);

    SkIRect regionBounds = clipRect;
    regionBounds.offset(clipRect.width() + (2*SPACER), 0);

    SkIRect regionInterior = regionBounds;
    regionInterior.inset(SPACER*3, SPACER*3);

    SkRegion clipRegion;
    clipRegion.setRect(regionBounds);
    clipRegion.op(regionInterior, SkRegion::kDifference_Op);


    const SkRegion::Op clipOps[] = { SkRegion::kIntersect_Op,
                                     SkRegion::kIntersect_Op,
                                     SkRegion::kReplace_Op,
    };
    const SkCanvas::SaveFlags flags[] = { SkCanvas::kARGB_NoClipLayer_SaveFlag,
                                          SkCanvas::kARGB_ClipLayer_SaveFlag,
                                          SkCanvas::kARGB_NoClipLayer_SaveFlag,
    };
    REPORTER_ASSERT(reporter, sizeof(clipOps) == sizeof(flags));
    const int layerCombinations = sizeof(flags) / sizeof(SkCanvas::SaveFlags);

    SkBitmap bitmaps[2];
    for (int i = 0; i < 2; ++i) {
        bitmaps[i].allocN32Pixels(WIDTH, HEIGHT);

        SkCanvas canvas(bitmaps[i]);

        canvas.drawColor(SK_ColorRED);

        SkRegion localRegion = clipRegion;

        for (int j = 0; j < layerCombinations; ++j) {
            SkRect layerBounds = SkRect::Make(layerRect);
            canvas.saveLayerAlpha(&layerBounds, 128, flags[j]);

            SkCanvasState* state = NULL;
            SkCanvas* tmpCanvas = NULL;
            if (i) {
                state = SkCanvasStateUtils::CaptureCanvasState(&canvas);
                REPORTER_ASSERT(reporter, state);
                tmpCanvas = SkCanvasStateUtils::CreateFromCanvasState(state);
                REPORTER_ASSERT(reporter, tmpCanvas);
            } else {
                tmpCanvas = SkRef(&canvas);
            }

            tmpCanvas->save();
            tmpCanvas->clipRect(SkRect::Make(clipRect), clipOps[j]);
            tmpCanvas->drawColor(SK_ColorBLUE);
            tmpCanvas->restore();

            tmpCanvas->clipRegion(localRegion, clipOps[j]);
            tmpCanvas->drawColor(SK_ColorBLUE);

            tmpCanvas->unref();
            SkCanvasStateUtils::ReleaseCanvasState(state);

            canvas.restore();

            // translate the canvas and region for the next iteration
            canvas.translate(0, SkIntToScalar(2*(layerRect.height() + (SPACER))));
            localRegion.translate(0, 2*(layerRect.height() + SPACER));
        }
    }

    // now we memcmp the two bitmaps
    REPORTER_ASSERT(reporter, bitmaps[0].getSize() == bitmaps[1].getSize());
    REPORTER_ASSERT(reporter, !memcmp(bitmaps[0].getPixels(),
                                      bitmaps[1].getPixels(),
                                      bitmaps[0].getSize()));
#endif
}

// Basic test of the SkSpecialImage public API (e.g., peekTexture, peekPixels & draw)
static void test_image(const sk_sp<SkSpecialImage>& img, skiatest::Reporter* reporter,
                       GrContext* context, bool peekTextureSucceeds,
                       int offset, int size) {
    const SkIRect subset = img->subset();
    REPORTER_ASSERT(reporter, offset == subset.left());
    REPORTER_ASSERT(reporter, offset == subset.top());
    REPORTER_ASSERT(reporter, kSmallerSize == subset.width());
    REPORTER_ASSERT(reporter, kSmallerSize == subset.height());

    //--------------
    // Test that peekTexture reports the correct backing type
    REPORTER_ASSERT(reporter, peekTextureSucceeds == img->isTextureBacked());

#if SK_SUPPORT_GPU
    //--------------
    // Test getTextureAsRef - as long as there is a context this should succeed
    if (context) {
        sk_sp<GrTexture> texture(img->asTextureRef(context));
        REPORTER_ASSERT(reporter, texture);
    }
#endif

    //--------------
    // Test getROPixels - this should always succeed regardless of backing store
    SkBitmap bitmap;
    REPORTER_ASSERT(reporter, img->getROPixels(&bitmap));
    if (context) {
        REPORTER_ASSERT(reporter, kSmallerSize == bitmap.width());
        REPORTER_ASSERT(reporter, kSmallerSize == bitmap.height());
    } else {
        REPORTER_ASSERT(reporter, size == bitmap.width());
        REPORTER_ASSERT(reporter, size == bitmap.height());
    }

    //--------------
    // Test that draw restricts itself to the subset
    SkImageInfo info = SkImageInfo::MakeN32(kFullSize, kFullSize, kOpaque_SkAlphaType);

    sk_sp<SkSpecialSurface> surf(img->makeSurface(info));

    SkCanvas* canvas = surf->getCanvas();

    canvas->clear(SK_ColorBLUE);
    img->draw(canvas, SkIntToScalar(kPad), SkIntToScalar(kPad), nullptr);

    SkBitmap bm;
    bm.allocN32Pixels(kFullSize, kFullSize, true);

    bool result = canvas->readPixels(bm.info(), bm.getPixels(), bm.rowBytes(), 0, 0);
    SkASSERT_RELEASE(result);

    // Only the center (red) portion should've been drawn into the canvas
    REPORTER_ASSERT(reporter, SK_ColorBLUE == bm.getColor(kPad-1, kPad-1));
    REPORTER_ASSERT(reporter, SK_ColorRED  == bm.getColor(kPad, kPad));
    REPORTER_ASSERT(reporter, SK_ColorRED  == bm.getColor(kSmallerSize+kPad-1,
                                                          kSmallerSize+kPad-1));
    REPORTER_ASSERT(reporter, SK_ColorBLUE == bm.getColor(kSmallerSize+kPad,
                                                          kSmallerSize+kPad));

    //--------------
    // Test that makeTightSubset & makeTightSurface return appropriately sized objects
    // of the correct backing type
    SkIRect newSubset = SkIRect::MakeWH(subset.width(), subset.height());
    {
        sk_sp<SkImage> tightImg(img->makeTightSubset(newSubset));

        REPORTER_ASSERT(reporter, tightImg->width() == subset.width());
        REPORTER_ASSERT(reporter, tightImg->height() == subset.height());
        REPORTER_ASSERT(reporter, peekTextureSucceeds == !!tightImg->getTexture());
        SkPixmap tmpPixmap;
        REPORTER_ASSERT(reporter, peekTextureSucceeds != !!tightImg->peekPixels(&tmpPixmap));
    }
    {
        SkImageInfo info = SkImageInfo::MakeN32(subset.width(), subset.height(),
                                                kPremul_SkAlphaType);
        sk_sp<SkSurface> tightSurf(img->makeTightSurface(info));

        REPORTER_ASSERT(reporter, tightSurf->width() == subset.width());
        REPORTER_ASSERT(reporter, tightSurf->height() == subset.height());
        REPORTER_ASSERT(reporter, peekTextureSucceeds ==
                     !!tightSurf->getTextureHandle(SkSurface::kDiscardWrite_BackendHandleAccess));
        SkPixmap tmpPixmap;
        REPORTER_ASSERT(reporter, peekTextureSucceeds != !!tightSurf->peekPixels(&tmpPixmap));
    }
}

bool SkBlurImageFilter::onFilterImageDeprecated(Proxy* proxy,
                                                const SkBitmap& source, const Context& ctx,
                                                SkBitmap* dst, SkIPoint* offset) const {
    SkBitmap src = source;
    SkIPoint srcOffset = SkIPoint::Make(0, 0);
    if (!this->filterInputDeprecated(0, proxy, source, ctx, &src, &srcOffset)) {
        return false;
    }

    if (src.colorType() != kN32_SkColorType) {
        return false;
    }

    SkIRect srcBounds = src.bounds();
    srcBounds.offset(srcOffset);
    SkIRect dstBounds;
    if (!this->applyCropRect(this->mapContext(ctx), srcBounds, &dstBounds)) {
        return false;
    }
    if (!srcBounds.intersect(dstBounds)) {
        return false;
    }

    SkVector sigma = map_sigma(fSigma, ctx.ctm());

    int kernelSizeX, kernelSizeX3, lowOffsetX, highOffsetX;
    int kernelSizeY, kernelSizeY3, lowOffsetY, highOffsetY;
    getBox3Params(sigma.x(), &kernelSizeX, &kernelSizeX3, &lowOffsetX, &highOffsetX);
    getBox3Params(sigma.y(), &kernelSizeY, &kernelSizeY3, &lowOffsetY, &highOffsetY);

    if (kernelSizeX < 0 || kernelSizeY < 0) {
        return false;
    }

    if (kernelSizeX == 0 && kernelSizeY == 0) {
        src.extractSubset(dst, srcBounds);
        offset->fX = srcBounds.x();
        offset->fY = srcBounds.y();
        return true;
    }

    SkAutoLockPixels alp(src);
    if (!src.getPixels()) {
        return false;
    }

    SkAutoTUnref<SkBaseDevice> device(proxy->createDevice(dstBounds.width(), dstBounds.height()));
    if (!device) {
        return false;
    }
    *dst = device->accessBitmap(false);
    SkAutoLockPixels alp_dst(*dst);

    SkAutoTUnref<SkBaseDevice> tempDevice(proxy->createDevice(dst->width(), dst->height()));
    if (!tempDevice) {
        return false;
    }
    SkBitmap temp = tempDevice->accessBitmap(false);
    SkAutoLockPixels alpTemp(temp);

    offset->fX = dstBounds.fLeft;
    offset->fY = dstBounds.fTop;
    SkPMColor* t = temp.getAddr32(0, 0);
    SkPMColor* d = dst->getAddr32(0, 0);
    int w = dstBounds.width(), h = dstBounds.height();
    const SkPMColor* s = src.getAddr32(srcBounds.x() - srcOffset.x(), srcBounds.y() - srcOffset.y());
    srcBounds.offset(-dstBounds.x(), -dstBounds.y());
    dstBounds.offset(-dstBounds.x(), -dstBounds.y());
    SkIRect srcBoundsT = SkIRect::MakeLTRB(srcBounds.top(), srcBounds.left(), srcBounds.bottom(), srcBounds.right());
    SkIRect dstBoundsT = SkIRect::MakeWH(dstBounds.height(), dstBounds.width());
    int sw = src.rowBytesAsPixels();

    /**
     *
     * In order to make memory accesses cache-friendly, we reorder the passes to
     * use contiguous memory reads wherever possible.
     *
     * For example, the 6 passes of the X-and-Y blur case are rewritten as
     * follows. Instead of 3 passes in X and 3 passes in Y, we perform
     * 2 passes in X, 1 pass in X transposed to Y on write, 2 passes in X,
     * then 1 pass in X transposed to Y on write.
     *
     * +----+       +----+       +----+        +---+       +---+       +---+        +----+
     * + AB + ----> | AB | ----> | AB | -----> | A | ----> | A | ----> | A | -----> | AB |
     * +----+ blurX +----+ blurX +----+ blurXY | B | blurX | B | blurX | B | blurXY +----+
     *                                         +---+       +---+       +---+
     *
     * In this way, two of the y-blurs become x-blurs applied to transposed
     * images, and all memory reads are contiguous.
     */
    if (kernelSizeX > 0 && kernelSizeY > 0) {
        SkOpts::box_blur_xx(s, sw,  srcBounds,  t, kernelSizeX,  lowOffsetX,  highOffsetX, w, h);
        SkOpts::box_blur_xx(t,  w,  dstBounds,  d, kernelSizeX,  highOffsetX, lowOffsetX,  w, h);
        SkOpts::box_blur_xy(d,  w,  dstBounds,  t, kernelSizeX3, highOffsetX, highOffsetX, w, h);
        SkOpts::box_blur_xx(t,  h,  dstBoundsT, d, kernelSizeY,  lowOffsetY,  highOffsetY, h, w);
        SkOpts::box_blur_xx(d,  h,  dstBoundsT, t, kernelSizeY,  highOffsetY, lowOffsetY,  h, w);
        SkOpts::box_blur_xy(t,  h,  dstBoundsT, d, kernelSizeY3, highOffsetY, highOffsetY, h, w);
    } else if (kernelSizeX > 0) {
        SkOpts::box_blur_xx(s, sw,  srcBounds,  d, kernelSizeX,  lowOffsetX,  highOffsetX, w, h);
        SkOpts::box_blur_xx(d,  w,  dstBounds,  t, kernelSizeX,  highOffsetX, lowOffsetX,  w, h);
//.........这里部分代码省略.........

sk_sp<GrTexture> GrClipMaskManager::CreateSoftwareClipMask(
                                                    GrTextureProvider* texProvider,
                                                    int32_t elementsGenID,
                                                    GrReducedClip::InitialState initialState,
                                                    const GrReducedClip::ElementList& elements,
                                                    const SkVector& clipToMaskOffset,
                                                    const SkIRect& clipSpaceIBounds) {
    GrUniqueKey key;
    GetClipMaskKey(elementsGenID, clipSpaceIBounds, &key);
    if (GrTexture* texture = texProvider->findAndRefTextureByUniqueKey(key)) {
        return sk_sp<GrTexture>(texture);
    }

    // The mask texture may be larger than necessary. We round out the clip space bounds and pin
    // the top left corner of the resulting rect to the top left of the texture.
    SkIRect maskSpaceIBounds = SkIRect::MakeWH(clipSpaceIBounds.width(), clipSpaceIBounds.height());

    GrSWMaskHelper helper(texProvider);

    // Set the matrix so that rendered clip elements are transformed to mask space from clip
    // space.
    SkMatrix translate;
    translate.setTranslate(clipToMaskOffset);

    helper.init(maskSpaceIBounds, &translate);
    helper.clear(GrReducedClip::kAllIn_InitialState == initialState ? 0xFF : 0x00);

    for (GrReducedClip::ElementList::Iter iter(elements.headIter()) ; iter.get(); iter.next()) {
        const Element* element = iter.get();
        SkRegion::Op op = element->getOp();

        if (SkRegion::kIntersect_Op == op || SkRegion::kReverseDifference_Op == op) {
            // Intersect and reverse difference require modifying pixels outside of the geometry
            // that is being "drawn". In both cases we erase all the pixels outside of the geometry
            // but leave the pixels inside the geometry alone. For reverse difference we invert all
            // the pixels before clearing the ones outside the geometry.
            if (SkRegion::kReverseDifference_Op == op) {
                SkRect temp = SkRect::Make(clipSpaceIBounds);
                // invert the entire scene
                helper.drawRect(temp, SkRegion::kXOR_Op, false, 0xFF);
            }
            SkPath clipPath;
            element->asPath(&clipPath);
            clipPath.toggleInverseFillType();
            GrShape shape(clipPath, GrStyle::SimpleFill());
            helper.drawShape(shape, SkRegion::kReplace_Op, element->isAA(), 0x00);
            continue;
        }

        // The other ops (union, xor, diff) only affect pixels inside
        // the geometry so they can just be drawn normally
        if (Element::kRect_Type == element->getType()) {
            helper.drawRect(element->getRect(), op, element->isAA(), 0xFF);
        } else {
            SkPath path;
            element->asPath(&path);
            GrShape shape(path, GrStyle::SimpleFill());
            helper.drawShape(shape, op, element->isAA(), 0xFF);
        }
    }

    // Allocate clip mask texture
    GrSurfaceDesc desc;
    desc.fWidth = clipSpaceIBounds.width();
    desc.fHeight = clipSpaceIBounds.height();
    desc.fConfig = kAlpha_8_GrPixelConfig;

    sk_sp<GrTexture> result(texProvider->createApproxTexture(desc));
    if (!result) {
        return nullptr;
    }
    result->resourcePriv().setUniqueKey(key);

    helper.toTexture(result.get());

    return result;
}

sk_sp<GrTexture> GrClipMaskManager::CreateAlphaClipMask(GrContext* context,
                                                        int32_t elementsGenID,
                                                        GrReducedClip::InitialState initialState,
                                                        const GrReducedClip::ElementList& elements,
                                                        const SkVector& clipToMaskOffset,
                                                        const SkIRect& clipSpaceIBounds) {
    GrResourceProvider* resourceProvider = context->resourceProvider();
    GrUniqueKey key;
    GetClipMaskKey(elementsGenID, clipSpaceIBounds, &key);
    if (GrTexture* texture = resourceProvider->findAndRefTextureByUniqueKey(key)) {
        return sk_sp<GrTexture>(texture);
    }

    // There's no texture in the cache. Let's try to allocate it then.
    GrPixelConfig config = kRGBA_8888_GrPixelConfig;
    if (context->caps()->isConfigRenderable(kAlpha_8_GrPixelConfig, false)) {
        config = kAlpha_8_GrPixelConfig;
    }

    sk_sp<GrDrawContext> dc(context->newDrawContext(SkBackingFit::kApprox,
                                                    clipSpaceIBounds.width(),
                                                    clipSpaceIBounds.height(),
                                                    config));
    if (!dc) {
        return nullptr;
    }
    
    // The texture may be larger than necessary, this rect represents the part of the texture
    // we populate with a rasterization of the clip.
    SkIRect maskSpaceIBounds = SkIRect::MakeWH(clipSpaceIBounds.width(), clipSpaceIBounds.height());

    // The scratch texture that we are drawing into can be substantially larger than the mask. Only
    // clear the part that we care about.
    dc->clear(&maskSpaceIBounds,
              GrReducedClip::kAllIn_InitialState == initialState ? 0xffffffff : 0x00000000,
              true);

    // Set the matrix so that rendered clip elements are transformed to mask space from clip
    // space.
    const SkMatrix translate = SkMatrix::MakeTrans(clipToMaskOffset.fX, clipToMaskOffset.fY);

    // It is important that we use maskSpaceIBounds as the stencil rect in the below loop.
    // The second pass that zeros the stencil buffer renders the rect maskSpaceIBounds so the first
    // pass must not set values outside of this bounds or stencil values outside the rect won't be
    // cleared.

    // walk through each clip element and perform its set op
    for (GrReducedClip::ElementList::Iter iter = elements.headIter(); iter.get(); iter.next()) {
        const Element* element = iter.get();
        SkRegion::Op op = element->getOp();
        bool invert = element->isInverseFilled();
        if (invert || SkRegion::kIntersect_Op == op || SkRegion::kReverseDifference_Op == op) {
            GrFixedClip clip(maskSpaceIBounds);

            // draw directly into the result with the stencil set to make the pixels affected
            // by the clip shape be non-zero.
            static constexpr GrUserStencilSettings kStencilInElement(
                 GrUserStencilSettings::StaticInit<
                     0xffff,
                     GrUserStencilTest::kAlways,
                     0xffff,
                     GrUserStencilOp::kReplace,
                     GrUserStencilOp::kReplace,
                     0xffff>()
            );
            if (!stencil_element(dc.get(), clip, &kStencilInElement,
                                 translate, element)) {
                return nullptr;
            }

            // Draw to the exterior pixels (those with a zero stencil value).
            static constexpr GrUserStencilSettings kDrawOutsideElement(
                 GrUserStencilSettings::StaticInit<
                     0x0000,
                     GrUserStencilTest::kEqual,
                     0xffff,
                     GrUserStencilOp::kZero,
                     GrUserStencilOp::kZero,
                     0xffff>()
            );
            if (!dc->drawContextPriv().drawAndStencilRect(clip, &kDrawOutsideElement,
                                                          op, !invert, false,
                                                          translate,
                                                          SkRect::Make(clipSpaceIBounds))) {
                return nullptr;
            }
        } else {
            // all the remaining ops can just be directly draw into the accumulation buffer
            GrPaint paint;
            paint.setAntiAlias(element->isAA());
            paint.setCoverageSetOpXPFactory(op, false);

            draw_element(dc.get(), GrNoClip(), paint, translate, element);
        }
    }

    sk_sp<GrTexture> texture(dc->asTexture());
    SkASSERT(texture);
    texture->resourcePriv().setUniqueKey(key);
    return texture;
//.........这里部分代码省略.........

void NinePatch_Draw(SkCanvas* canvas, const SkRect& bounds,
                       const SkBitmap& bitmap, const android::Res_png_9patch& chunk,
                       const SkPaint* paint, SkRegion** outRegion) {
    if (canvas && canvas->quickReject(bounds, SkCanvas::kBW_EdgeType)) {
        return;
    }
    
    // if our canvas is GL, draw this as a mesh, which will be faster than
    // in parts (which is faster for raster)
    if (canvas && canvas->getViewport(NULL)) {
        SkNinePatch::DrawMesh(canvas, bounds, bitmap,
                              chunk.xDivs, chunk.numXDivs,
                              chunk.yDivs, chunk.numYDivs,
                              paint);
        return;
    }

#ifdef USE_TRACE
    gTrace = true;
#endif

    SkASSERT(canvas || outRegion);

#if 0
    if (canvas) {
        const SkMatrix& m = canvas->getTotalMatrix();
        SkDebugf("ninepatch [%g %g %g] [%g %g %g]\n",
                 SkScalarToFloat(m[0]), SkScalarToFloat(m[1]), SkScalarToFloat(m[2]),
                 SkScalarToFloat(m[3]), SkScalarToFloat(m[4]), SkScalarToFloat(m[5]));
    }
#endif

#ifdef USE_TRACE
    if (gTrace) {
        SkDEBUGF(("======== ninepatch bounds [%g %g]\n", SkScalarToFloat(bounds.width()), SkScalarToFloat(bounds.height())));
        SkDEBUGF(("======== ninepatch paint bm [%d,%d]\n", bitmap.width(), bitmap.height()));
        SkDEBUGF(("======== ninepatch xDivs [%d,%d]\n", chunk.xDivs[0], chunk.xDivs[1]));
        SkDEBUGF(("======== ninepatch yDivs [%d,%d]\n", chunk.yDivs[0], chunk.yDivs[1]));
    }
#endif

    if (bounds.isEmpty() ||
        bitmap.width() == 0 || bitmap.height() == 0 ||
        (paint && paint->getXfermode() == NULL && paint->getAlpha() == 0))
    {
#ifdef USE_TRACE
        if (gTrace) SkDEBUGF(("======== abort ninepatch draw\n"));
#endif
        return;
    }
    
    // should try a quick-reject test before calling lockPixels 

    SkAutoLockPixels alp(bitmap);
    // after the lock, it is valid to check getPixels()
    if (bitmap.getPixels() == NULL)
        return;

    SkPaint defaultPaint;
    if (NULL == paint) {
        paint = &defaultPaint;
    }

    const bool hasXfer = paint->getXfermode() != NULL;
    SkRect      dst;
    SkIRect     src;

    const int32_t x0 = chunk.xDivs[0];
    const int32_t y0 = chunk.yDivs[0];
    const SkColor initColor = ((SkPaint*)paint)->getColor();
    const uint8_t numXDivs = chunk.numXDivs;
    const uint8_t numYDivs = chunk.numYDivs;
    int i;
    int j;
    int colorIndex = 0;
    uint32_t color;
    bool xIsStretchable;
    const bool initialXIsStretchable =  (x0 == 0);
    bool yIsStretchable = (y0 == 0);
    const int bitmapWidth = bitmap.width();
    const int bitmapHeight = bitmap.height();

    SkScalar* dstRights = (SkScalar*) alloca((numXDivs + 1) * sizeof(SkScalar));
    bool dstRightsHaveBeenCached = false;

    int numStretchyXPixelsRemaining = 0;
    for (i = 0; i < numXDivs; i += 2) {
        numStretchyXPixelsRemaining += chunk.xDivs[i + 1] - chunk.xDivs[i];
    }
    int numFixedXPixelsRemaining = bitmapWidth - numStretchyXPixelsRemaining;
    int numStretchyYPixelsRemaining = 0;
    for (i = 0; i < numYDivs; i += 2) {
        numStretchyYPixelsRemaining += chunk.yDivs[i + 1] - chunk.yDivs[i];
    }
    int numFixedYPixelsRemaining = bitmapHeight - numStretchyYPixelsRemaining;

#if 0
    SkDebugf("NinePatch [%d %d] bounds [%g %g %g %g] divs [%d %d]\n",
             bitmap.width(), bitmap.height(),
             SkScalarToFloat(bounds.fLeft), SkScalarToFloat(bounds.fTop),
//.........这里部分代码省略.........

// Create the layer information for the hoisted layer and secure the
// required texture/render target resources.
static void prepare_for_hoisting(GrLayerCache* layerCache,
                                 const SkPicture* topLevelPicture,
                                 const SkMatrix& initialMat,
                                 const SkLayerInfo::BlockInfo& info,
                                 const SkIRect& srcIR,
                                 const SkIRect& dstIR,
                                 SkTDArray<GrHoistedLayer>* needRendering,
                                 SkTDArray<GrHoistedLayer>* recycled,
                                 bool attemptToAtlas,
                                 int numSamples) {
    const SkPicture* pict = info.fPicture ? info.fPicture : topLevelPicture;

    GrCachedLayer* layer = layerCache->findLayerOrCreate(topLevelPicture->uniqueID(),
                                                         SkToInt(info.fSaveLayerOpID),
                                                         SkToInt(info.fRestoreOpID),
                                                         srcIR,
                                                         dstIR,
                                                         initialMat,
                                                         info.fKey,
                                                         info.fKeySize,
                                                         info.fPaint);
    GrSurfaceDesc desc;
    desc.fFlags = kRenderTarget_GrSurfaceFlag;
    desc.fWidth = srcIR.width();
    desc.fHeight = srcIR.height();
    desc.fConfig = kSkia8888_GrPixelConfig;
    desc.fSampleCnt = numSamples;

    bool locked, needsRendering;
    if (attemptToAtlas) {
        locked = layerCache->tryToAtlas(layer, desc, &needsRendering);
    } else {
        locked = layerCache->lock(layer, desc, &needsRendering);
    }
    if (!locked) {
        // GPU resources could not be secured for the hoisting of this layer
        return;
    }

    if (attemptToAtlas) {
        SkASSERT(layer->isAtlased());
    }

    GrHoistedLayer* hl;

    if (needsRendering) {
        if (!attemptToAtlas) {
            SkASSERT(!layer->isAtlased());
        }
        hl = needRendering->append();
    } else {
        hl = recycled->append();
    }

    layerCache->addUse(layer);
    hl->fLayer = layer;
    hl->fPicture = pict;
    hl->fLocalMat = info.fLocalMat;
    hl->fInitialMat = initialMat;
    hl->fPreMat = initialMat;
    hl->fPreMat.preConcat(info.fPreMat);
}