C++ SkRect::join方法代码示例

SkRect SkImageFilter::computeFastBounds(const SkRect& src) const {
    if (0 == this->countInputs()) {
        return src;
    }
    SkRect combinedBounds = this->getInput(0) ? this->getInput(0)->computeFastBounds(src) : src;
    for (int i = 1; i < this->countInputs(); i++) {
        SkImageFilter* input = this->getInput(i);
        if (input) {
            combinedBounds.join(input->computeFastBounds(src));
        } else {
            combinedBounds.join(src);
        }
    }
    return combinedBounds;
}

// doesn't work yet
void comparePathsTiny(const SkPath& one, const SkPath& two) {
    const SkRect& bounds1 = one.getBounds();
    const SkRect& bounds2 = two.getBounds();
    SkRect larger = bounds1;
    larger.join(bounds2);
    SkBitmap bits;
    int bitWidth = SkScalarCeil(larger.width()) + 2;
    int bitHeight = SkScalarCeil(larger.height()) + 2;
    bits.setConfig(SkBitmap::kA1_Config, bitWidth * 2, bitHeight);
    bits.allocPixels();
    SkCanvas canvas(bits);
    canvas.drawColor(SK_ColorWHITE);
    SkPaint paint;
    canvas.save();
    canvas.translate(-bounds1.fLeft + 1, -bounds1.fTop + 1);
    canvas.drawPath(one, paint);
    canvas.restore();
    canvas.save();
    canvas.translate(-bounds2.fLeft + 1, -bounds2.fTop + 1);
    canvas.drawPath(two, paint);
    canvas.restore();
    for (int y = 0; y < bitHeight; ++y) {
        uint8_t* addr1 = bits.getAddr1(0, y);
        uint8_t* addr2 = bits.getAddr1(bitWidth, y);
        for (int x = 0; x < bits.rowBytes(); ++x) {
            SkASSERT(addr1[x] == addr2[x]);
        }
    }
}

void GrDrawTarget::drawPaths(int pathCount, const GrPath** paths,
                             const SkMatrix* transforms,
                             SkPath::FillType fill, SkStrokeRec::Style stroke) {
    SkASSERT(pathCount > 0);
    SkASSERT(NULL != paths);
    SkASSERT(NULL != paths[0]);
    SkASSERT(this->caps()->pathRenderingSupport());
    SkASSERT(!SkPath::IsInverseFillType(fill));

    const GrDrawState* drawState = &getDrawState();

    SkRect devBounds;
    for (int i = 0; i < pathCount; ++i) {
        SkRect mappedPathBounds;
        transforms[i].mapRect(&mappedPathBounds, paths[i]->getBounds());
        devBounds.join(mappedPathBounds);
    }

    SkMatrix viewM = drawState->getViewMatrix();
    viewM.mapRect(&devBounds);

    GrDeviceCoordTexture dstCopy;
    if (!this->setupDstReadIfNecessary(&dstCopy, &devBounds)) {
        return;
    }

    this->onDrawPaths(pathCount, paths, transforms, fill, stroke,
                      dstCopy.texture() ? &dstCopy : NULL);
}

static void scaleMatrix(const SkPath& one, const SkPath& two, SkMatrix& scale) {
    SkRect larger = one.getBounds();
    larger.join(two.getBounds());
    SkScalar largerWidth = larger.width();
    if (largerWidth < 4) {
        largerWidth = 4;
    }
    SkScalar largerHeight = larger.height();
    if (largerHeight < 4) {
        largerHeight = 4;
    }
    SkScalar hScale = (bitWidth - 2) / largerWidth;
    SkScalar vScale = (bitHeight - 2) / largerHeight;
    scale.reset();
    scale.preScale(hScale, vScale);
    larger.fLeft *= hScale;
    larger.fRight *= hScale;
    larger.fTop *= vScale;
    larger.fBottom *= vScale;
    SkScalar dx = -16000 > larger.fLeft ? -16000 - larger.fLeft
            : 16000 < larger.fRight ? 16000 - larger.fRight : 0;
    SkScalar dy = -16000 > larger.fTop ? -16000 - larger.fTop
            : 16000 < larger.fBottom ? 16000 - larger.fBottom : 0;
    scale.postTranslate(dx, dy);
}

SkRect SkDropShadowImageFilter::computeFastBounds(const SkRect& src) const {
    SkRect bounds = this->getInput(0) ? this->getInput(0)->computeFastBounds(src) : src;
    SkRect shadowBounds = bounds;
    shadowBounds.offset(fDx, fDy);
    shadowBounds.outset(fSigmaX * 3, fSigmaY * 3);
    if (fShadowMode == kDrawShadowAndForeground_ShadowMode) {
        bounds.join(shadowBounds);
    } else {
        bounds = shadowBounds;
    }
    return bounds;
}

bool drawAsciiPaths(const SkPath& one, const SkPath& two,
        bool drawPaths) {
    if (!drawPaths) {
        return true;
    }
    if (gShowAsciiPaths) {
        showPath(one, "one:");
        showPath(two, "two:");
    }
    const SkRect& bounds1 = one.getBounds();
    const SkRect& bounds2 = two.getBounds();
    SkRect larger = bounds1;
    larger.join(bounds2);
    SkBitmap bits;
    char out[256];
    int bitWidth = SkScalarCeil(larger.width()) + 2;
    if (bitWidth * 2 + 1 >= (int) sizeof(out)) {
        return false;
    }
    int bitHeight = SkScalarCeil(larger.height()) + 2;
    if (bitHeight >= (int) sizeof(out)) {
        return false;
    }
    bits.setConfig(SkBitmap::kARGB_8888_Config, bitWidth * 2, bitHeight);
    bits.allocPixels();
    SkCanvas canvas(bits);
    canvas.drawColor(SK_ColorWHITE);
    SkPaint paint;
    canvas.save();
    canvas.translate(-bounds1.fLeft + 1, -bounds1.fTop + 1);
    canvas.drawPath(one, paint);
    canvas.restore();
    canvas.save();
    canvas.translate(-bounds2.fLeft + 1 + bitWidth, -bounds2.fTop + 1);
    canvas.drawPath(two, paint);
    canvas.restore();
    for (int y = 0; y < bitHeight; ++y) {
        uint32_t* addr1 = bits.getAddr32(0, y);
        int x;
        char* outPtr = out;
        for (x = 0; x < bitWidth; ++x) {
            *outPtr++ = addr1[x] == (uint32_t) -1 ? '_' : 'x';
        }
        *outPtr++ = '|';
        for (x = bitWidth; x < bitWidth * 2; ++x) {
            *outPtr++ = addr1[x] == (uint32_t) -1 ? '_' : 'x';
        }
        *outPtr++ = '\0';
        SkDebugf("%s\n", out);
    }
    return true;
}

static int pathsDrawTheSame(const SkPath& one, const SkPath& two,
        SkBitmap& bits, SkCanvas* c) {
    SkCanvas* canvasPtr = c;
    if (!c) {
        canvasPtr = new SkCanvas(bits);
    }
    const SkRect& bounds1 = one.getBounds();
    const SkRect& bounds2 = two.getBounds();
    SkRect larger = bounds1;
    larger.join(bounds2);
    int bitWidth = SkScalarCeil(larger.width()) + 2;
    int bitHeight = SkScalarCeil(larger.height()) + 2;
    if (bits.width() < bitWidth * 2 || bits.height() < bitHeight) {
        if (bits.width() >= 200) {
            SkDebugf("%s bitWidth=%d bitHeight=%d\n", __FUNCTION__, bitWidth, bitHeight);
        }
        bits.setConfig(SkBitmap::kARGB_8888_Config, bitWidth * 2, bitHeight);
        bits.allocPixels();
        canvasPtr->setBitmapDevice(bits);
    }
    SkCanvas& canvas = *canvasPtr;
    canvas.drawColor(SK_ColorWHITE);
    SkPaint paint;
    canvas.save();
    canvas.translate(-bounds1.fLeft + 1, -bounds1.fTop + 1);
    canvas.drawPath(one, paint);
    canvas.restore();
    canvas.save();
    canvas.translate(-bounds1.fLeft + 1 + bitWidth, -bounds1.fTop + 1);
    canvas.drawPath(two, paint);
    canvas.restore();
    int errors = 0;
    for (int y = 0; y < bitHeight; ++y) {
        uint32_t* addr1 = bits.getAddr32(0, y);
        uint32_t* addr2 = bits.getAddr32(bitWidth, y);
        for (int x = 0; x < bitWidth; ++x) {
            errors += addr1[x] != addr2[x];
        }
    }
    if (!c) {
        delete canvasPtr;
    }
    return errors;
}

SkPDFImageShader* SkPDFImageShader::Create(
        SkPDFCanon* canon,
        SkScalar dpi,
        SkAutoTDelete<SkPDFShader::State>* autoState) {
    const SkPDFShader::State& state = **autoState;

    state.fImage.lockPixels();

    // The image shader pattern cell will be drawn into a separate device
    // in pattern cell space (no scaling on the bitmap, though there may be
    // translations so that all content is in the device, coordinates > 0).

    // Map clip bounds to shader space to ensure the device is large enough
    // to handle fake clamping.
    SkMatrix finalMatrix = state.fCanvasTransform;
    finalMatrix.preConcat(state.fShaderTransform);
    SkRect deviceBounds;
    deviceBounds.set(state.fBBox);
    if (!inverse_transform_bbox(finalMatrix, &deviceBounds)) {
        return NULL;
    }

    const SkBitmap* image = &state.fImage;
    SkRect bitmapBounds;
    image->getBounds(&bitmapBounds);

    // For tiling modes, the bounds should be extended to include the bitmap,
    // otherwise the bitmap gets clipped out and the shader is empty and awful.
    // For clamp modes, we're only interested in the clip region, whether
    // or not the main bitmap is in it.
    SkShader::TileMode tileModes[2];
    tileModes[0] = state.fImageTileModes[0];
    tileModes[1] = state.fImageTileModes[1];
    if (tileModes[0] != SkShader::kClamp_TileMode ||
            tileModes[1] != SkShader::kClamp_TileMode) {
        deviceBounds.join(bitmapBounds);
    }

    SkISize size = SkISize::Make(SkScalarRoundToInt(deviceBounds.width()),
                                 SkScalarRoundToInt(deviceBounds.height()));
    SkAutoTUnref<SkPDFDevice> patternDevice(
            SkPDFDevice::CreateUnflipped(size, dpi, canon));
    SkCanvas canvas(patternDevice.get());

    SkRect patternBBox;
    image->getBounds(&patternBBox);

    // Translate the canvas so that the bitmap origin is at (0, 0).
    canvas.translate(-deviceBounds.left(), -deviceBounds.top());
    patternBBox.offset(-deviceBounds.left(), -deviceBounds.top());
    // Undo the translation in the final matrix
    finalMatrix.preTranslate(deviceBounds.left(), deviceBounds.top());

    // If the bitmap is out of bounds (i.e. clamp mode where we only see the
    // stretched sides), canvas will clip this out and the extraneous data
    // won't be saved to the PDF.
    canvas.drawBitmap(*image, 0, 0);

    SkScalar width = SkIntToScalar(image->width());
    SkScalar height = SkIntToScalar(image->height());

    // Tiling is implied.  First we handle mirroring.
    if (tileModes[0] == SkShader::kMirror_TileMode) {
        SkMatrix xMirror;
        xMirror.setScale(-1, 1);
        xMirror.postTranslate(2 * width, 0);
        drawBitmapMatrix(&canvas, *image, xMirror);
        patternBBox.fRight += width;
    }
    if (tileModes[1] == SkShader::kMirror_TileMode) {
        SkMatrix yMirror;
        yMirror.setScale(SK_Scalar1, -SK_Scalar1);
        yMirror.postTranslate(0, 2 * height);
        drawBitmapMatrix(&canvas, *image, yMirror);
        patternBBox.fBottom += height;
    }
    if (tileModes[0] == SkShader::kMirror_TileMode &&
            tileModes[1] == SkShader::kMirror_TileMode) {
        SkMatrix mirror;
        mirror.setScale(-1, -1);
        mirror.postTranslate(2 * width, 2 * height);
        drawBitmapMatrix(&canvas, *image, mirror);
    }

    // Then handle Clamping, which requires expanding the pattern canvas to
    // cover the entire surfaceBBox.

    // If both x and y are in clamp mode, we start by filling in the corners.
    // (Which are just a rectangles of the corner colors.)
    if (tileModes[0] == SkShader::kClamp_TileMode &&
            tileModes[1] == SkShader::kClamp_TileMode) {
        SkPaint paint;
        SkRect rect;
        rect = SkRect::MakeLTRB(deviceBounds.left(), deviceBounds.top(), 0, 0);
        if (!rect.isEmpty()) {
            paint.setColor(image->getColor(0, 0));
            canvas.drawRect(rect, paint);
        }

        rect = SkRect::MakeLTRB(width, deviceBounds.top(),
//.........这里部分代码省略.........

void GrDrawTarget::drawBatches(GrBatchFlushState* flushState) {
    // Draw all the generated geometry.
    SkRandom random;
    GrRenderTarget* currentRT = nullptr;
    SkAutoTDelete<GrGpuCommandBuffer> commandBuffer;
    SkRect bounds = SkRect::MakeEmpty();
    for (int i = 0; i < fBatches.count(); ++i) {
        if (!fBatches[i]) {
            continue;
        }
        if (fBatches[i]->renderTarget() != currentRT) {
            if (commandBuffer) {
                commandBuffer->end();
                if (bounds.intersect(0, 0,
                                     SkIntToScalar(currentRT->width()),
                                     SkIntToScalar(currentRT->height()))) {
                    SkIRect iBounds;
                    bounds.roundOut(&iBounds);
                    commandBuffer->submit(iBounds);
                }
                commandBuffer.reset();
            }
            bounds.setEmpty();
            currentRT = fBatches[i]->renderTarget();
            if (currentRT) {
                static const GrGpuCommandBuffer::LoadAndStoreInfo kBasicLoadStoreInfo
                    { GrGpuCommandBuffer::LoadOp::kLoad,GrGpuCommandBuffer::StoreOp::kStore,
                      GrColor_ILLEGAL };
                commandBuffer.reset(fGpu->createCommandBuffer(currentRT,
                                                              kBasicLoadStoreInfo,   // Color
                                                              kBasicLoadStoreInfo)); // Stencil
            }
            flushState->setCommandBuffer(commandBuffer);
        }
        if (commandBuffer) {
            bounds.join(fBatches[i]->bounds());
        }
        if (fDrawBatchBounds) {
            const SkRect& batchBounds = fBatches[i]->bounds();
            SkIRect iBatchBounds;
            batchBounds.roundOut(&iBatchBounds);
            // In multi-draw buffer all the batches use the same render target and we won't need to
            // get the batchs bounds.
            if (GrRenderTarget* rt = fBatches[i]->renderTarget()) {
                fGpu->drawDebugWireRect(rt, iBatchBounds, 0xFF000000 | random.nextU());
            }
        }
        fBatches[i]->draw(flushState);
    }
    if (commandBuffer) {
        commandBuffer->end();
        if (bounds.intersect(0, 0,
                             SkIntToScalar(currentRT->width()),
                             SkIntToScalar(currentRT->height()))) {
            SkIRect iBounds;
            bounds.roundOut(&iBounds);
            commandBuffer->submit(iBounds);
        }
        flushState->setCommandBuffer(nullptr);
    }

    fGpu->finishDrawTarget();
}

GrDrawVerticesOp::GrDrawVerticesOp(const Helper::MakeArgs& helperArgs, GrColor color,
                                   sk_sp<SkVertices> vertices, const SkVertices::Bone bones[],
                                   int boneCount, GrPrimitiveType primitiveType, GrAAType aaType,
                                   sk_sp<GrColorSpaceXform> colorSpaceXform,
                                   const SkMatrix& viewMatrix)
        : INHERITED(ClassID())
        , fHelper(helperArgs, aaType)
        , fPrimitiveType(primitiveType)
        , fColorSpaceXform(std::move(colorSpaceXform)) {
    SkASSERT(vertices);

    fVertexCount = vertices->vertexCount();
    fIndexCount = vertices->indexCount();
    fColorArrayType = vertices->hasColors() ? ColorArrayType::kSkColor
                                            : ColorArrayType::kPremulGrColor;

    Mesh& mesh = fMeshes.push_back();
    mesh.fColor = color;
    mesh.fViewMatrix = viewMatrix;
    mesh.fVertices = std::move(vertices);
    mesh.fIgnoreTexCoords = false;
    mesh.fIgnoreColors = false;
    mesh.fIgnoreBones = false;

    if (mesh.fVertices->hasBones() && bones) {
        // Perform the transformations on the CPU instead of the GPU.
        mesh.fVertices = mesh.fVertices->applyBones(bones, boneCount);
    } else {
        if (bones && boneCount > 1) {
            // NOTE: This should never be used. All bone transforms are being done on the CPU
            // instead of the GPU.

            // Copy the bone data.
            fBones.assign(bones, bones + boneCount);
        }
    }

    fFlags = 0;
    if (mesh.hasPerVertexColors()) {
        fFlags |= kRequiresPerVertexColors_Flag;
    }
    if (mesh.hasExplicitLocalCoords()) {
        fFlags |= kAnyMeshHasExplicitLocalCoords_Flag;
    }
    if (mesh.hasBones()) {
        fFlags |= kHasBones_Flag;
    }

    // Special case for meshes with a world transform but no bone weights.
    // These will be considered normal vertices draws without bones.
    if (!mesh.fVertices->hasBones() && boneCount == 1) {
        SkMatrix worldTransform;
        worldTransform.setAffine(bones[0].values);
        mesh.fViewMatrix.preConcat(worldTransform);
    }

    IsZeroArea zeroArea;
    if (GrIsPrimTypeLines(primitiveType) || GrPrimitiveType::kPoints == primitiveType) {
        zeroArea = IsZeroArea::kYes;
    } else {
        zeroArea = IsZeroArea::kNo;
    }

    if (this->hasBones()) {
        // We don't know the bounds if there are deformations involved, so attempt to calculate
        // the maximum possible.
        SkRect bounds = SkRect::MakeEmpty();
        const SkRect originalBounds = bones[0].mapRect(mesh.fVertices->bounds());
        for (int i = 1; i < boneCount; i++) {
            const SkVertices::Bone& matrix = bones[i];
            bounds.join(matrix.mapRect(originalBounds));
        }

        this->setTransformedBounds(bounds,
                                   mesh.fViewMatrix,
                                   HasAABloat::kNo,
                                   zeroArea);
    } else {
        this->setTransformedBounds(mesh.fVertices->bounds(),
                                   mesh.fViewMatrix,
                                   HasAABloat::kNo,
                                   zeroArea);
    }
}

    virtual void onDraw(SkCanvas* canvas) {
        SkPath path;
        path.moveTo(SkIntToScalar(0),   SkIntToScalar(50));
        path.quadTo(SkIntToScalar(0),   SkIntToScalar(0),   SkIntToScalar(50),  SkIntToScalar(0));
        path.lineTo(SkIntToScalar(175), SkIntToScalar(0));
        path.quadTo(SkIntToScalar(200), SkIntToScalar(0),   SkIntToScalar(200), SkIntToScalar(25));
        path.lineTo(SkIntToScalar(200), SkIntToScalar(150));
        path.quadTo(SkIntToScalar(200), SkIntToScalar(200), SkIntToScalar(150), SkIntToScalar(200));
        path.lineTo(SkIntToScalar(0),   SkIntToScalar(200));
        path.close();
        path.moveTo(SkIntToScalar(50),  SkIntToScalar(50));
        path.lineTo(SkIntToScalar(150), SkIntToScalar(50));
        path.lineTo(SkIntToScalar(150), SkIntToScalar(125));
        path.quadTo(SkIntToScalar(150), SkIntToScalar(150), SkIntToScalar(125), SkIntToScalar(150));
        path.lineTo(SkIntToScalar(50),  SkIntToScalar(150));
        path.close();
        if (fInvertDraw) {
            path.setFillType(SkPath::kInverseEvenOdd_FillType);
        } else {
            path.setFillType(SkPath::kEvenOdd_FillType);
        }
        SkPaint pathPaint;
        pathPaint.setAntiAlias(true);
        pathPaint.setColor(gPathColor);

        SkPath clipA;
        clipA.moveTo(SkIntToScalar(10),  SkIntToScalar(20));
        clipA.lineTo(SkIntToScalar(165), SkIntToScalar(22));
        clipA.lineTo(SkIntToScalar(70),  SkIntToScalar(105));
        clipA.lineTo(SkIntToScalar(165), SkIntToScalar(177));
        clipA.lineTo(SkIntToScalar(-5),  SkIntToScalar(180));
        clipA.close();

        SkPath clipB;
        clipB.moveTo(SkIntToScalar(40),  SkIntToScalar(10));
        clipB.lineTo(SkIntToScalar(190), SkIntToScalar(15));
        clipB.lineTo(SkIntToScalar(195), SkIntToScalar(190));
        clipB.lineTo(SkIntToScalar(40),  SkIntToScalar(185));
        clipB.lineTo(SkIntToScalar(155), SkIntToScalar(100));
        clipB.close();

        SkPaint paint;
        paint.setAntiAlias(true);
        sk_tool_utils::set_portable_typeface(&paint);
        paint.setTextSize(SkIntToScalar(20));

        static const struct {
            SkRegion::Op fOp;
            const char*  fName;
        } gOps[] = { //extra spaces in names for measureText
            {SkRegion::kIntersect_Op,         "Isect "},
            {SkRegion::kDifference_Op,        "Diff " },
            {SkRegion::kUnion_Op,             "Union "},
            {SkRegion::kXOR_Op,               "Xor "  },
            {SkRegion::kReverseDifference_Op, "RDiff "}
        };

        canvas->translate(SkIntToScalar(20), SkIntToScalar(20));
        canvas->scale(3 * SK_Scalar1 / 4, 3 * SK_Scalar1 / 4);

        if (fDoSaveLayer) {
            // We want the layer to appear symmetric relative to actual
            // device boundaries so we need to "undo" the effect of the
            // scale and translate
            SkRect bounds = SkRect::MakeLTRB(
              4.0f/3.0f * -20,
              4.0f/3.0f * -20,
              4.0f/3.0f * (this->getISize().fWidth - 20),
              4.0f/3.0f * (this->getISize().fHeight - 20));

            bounds.inset(SkIntToScalar(100), SkIntToScalar(100));
            SkPaint boundPaint;
            boundPaint.setColor(SK_ColorRED);
            boundPaint.setStyle(SkPaint::kStroke_Style);
            canvas->drawRect(bounds, boundPaint);
            canvas->saveLayer(&bounds, NULL);
        }

        for (int invBits = 0; invBits < 4; ++invBits) {
            canvas->save();
            for (size_t op = 0; op < SK_ARRAY_COUNT(gOps); ++op) {
                this->drawHairlines(canvas, path, clipA, clipB);

                bool doInvA = SkToBool(invBits & 1);
                bool doInvB = SkToBool(invBits & 2);
                canvas->save();
                    // set clip
                    clipA.setFillType(doInvA ? SkPath::kInverseEvenOdd_FillType :
                                      SkPath::kEvenOdd_FillType);
                    clipB.setFillType(doInvB ? SkPath::kInverseEvenOdd_FillType :
                                      SkPath::kEvenOdd_FillType);
                    canvas->clipPath(clipA, SkRegion::kIntersect_Op, fDoAAClip);
                    canvas->clipPath(clipB, gOps[op].fOp, fDoAAClip);

                    // In the inverse case we need to prevent the draw from covering the whole
                    // canvas.
                    if (fInvertDraw) {
                        SkRect rectClip = clipA.getBounds();
                        rectClip.join(path.getBounds());
                        rectClip.join(path.getBounds());
//.........这里部分代码省略.........

static int pathsDrawTheSame(const SkPath& one, const SkPath& two,
        SkBitmap& bits, SkPath& scaledOne, SkPath& scaledTwo, int& error2x2) {
    const int bitWidth = 64;
    const int bitHeight = 64;
    if (bits.width() == 0) {
        bits.setConfig(SkBitmap::kARGB_8888_Config, bitWidth * 2, bitHeight);
        bits.allocPixels();
    }

    SkRect larger = one.getBounds();
    larger.join(two.getBounds());
    SkScalar largerWidth = larger.width();
    if (largerWidth < 4) {
        largerWidth = 4;
    }
    SkScalar largerHeight = larger.height();
    if (largerHeight < 4) {
        largerHeight = 4;
    }
    SkScalar hScale = (bitWidth - 2) / largerWidth;
    SkScalar vScale = (bitHeight - 2) / largerHeight;
    SkMatrix scale;
    scale.reset();
    scale.preScale(hScale, vScale);
    one.transform(scale, &scaledOne);
    two.transform(scale, &scaledTwo);
    const SkRect& bounds1 = scaledOne.getBounds();

    SkCanvas canvas(bits);
    canvas.drawColor(SK_ColorWHITE);
    SkPaint paint;
    canvas.save();
    canvas.translate(-bounds1.fLeft + 1, -bounds1.fTop + 1);
    canvas.drawPath(scaledOne, paint);
    canvas.restore();
    canvas.save();
    canvas.translate(-bounds1.fLeft + 1 + bitWidth, -bounds1.fTop + 1);
    canvas.drawPath(scaledTwo, paint);
    canvas.restore();
    int errors2 = 0;
    int errors = 0;
    for (int y = 0; y < bitHeight - 1; ++y) {
        uint32_t* addr1 = bits.getAddr32(0, y);
        uint32_t* addr2 = bits.getAddr32(0, y + 1);
        uint32_t* addr3 = bits.getAddr32(bitWidth, y);
        uint32_t* addr4 = bits.getAddr32(bitWidth, y + 1);
        for (int x = 0; x < bitWidth - 1; ++x) {
            // count 2x2 blocks
            bool err = addr1[x] != addr3[x];
            if (err) {
                errors2 += addr1[x + 1] != addr3[x + 1]
                        && addr2[x] != addr4[x] && addr2[x + 1] != addr4[x + 1];
                errors++;
            }
        }
    }
    if (errors2 >= 6 || errors > 160) {
        SkDebugf("%s errors2=%d errors=%d\n", __FUNCTION__, errors2, errors);
    }
    error2x2 = errors2;
    return errors;
}