C++ SkRect类代码示例

bool intersects(SkRect tRect, float tRot, TextDrawInfo* s)
{
	float sRot = s->pathRotate;
	if (abs(tRot) < M_PI / 15 && abs(sRot) < M_PI / 15) {
		return SkRect::Intersects(tRect, s->bounds);
	}
	float dist = sqrt(sqr(tRect.centerX() - s->bounds.centerX()) + sqr(tRect.centerY() - s->bounds.centerY()));
	if(dist < 3) {
		return true;
	}
	SkRect sRect = s->bounds;

	// difference close to 90/270 degrees
	if(abs(cos(tRot-sRot)) < 0.3 ){
		// rotate one rectangle to 90 degrees
		tRot += M_PI_2;
		tRect = SkRect::MakeXYWH(tRect.centerX() -  tRect.height() / 2, tRect.centerY() -  tRect.width() / 2,
				tRect.height(), tRect.width());
	}

	// determine difference close to 180/0 degrees
	if(abs(sin(tRot-sRot)) < 0.3){
		// rotate t box
		// (calculate offset for t center suppose we rotate around s center)
		float diff = atan2(tRect.centerY() - sRect.centerY(), tRect.centerX() - sRect.centerX());
		diff -= sRot;
		float left = sRect.centerX() + dist* cos(diff) - tRect.width()/2;
		float top = sRect.centerY() - dist* sin(diff) - tRect.height()/2;
		SkRect nRect = SkRect::MakeXYWH(left, top, tRect.width(), tRect.height());
		return SkRect::Intersects(nRect, sRect);
	}

	// TODO other cases not covered
	return SkRect::Intersects(tRect, sRect);
}

GrTexture* GaussianBlur(GrContext* context,
                        GrTexture* srcTexture,
                        bool canClobberSrc,
                        const SkRect& rect,
                        bool cropToRect,
                        float sigmaX,
                        float sigmaY) {
    SkASSERT(context);

    SkIRect clearRect;
    int scaleFactorX, radiusX;
    int scaleFactorY, radiusY;
    int maxTextureSize = context->getMaxTextureSize();
    sigmaX = adjust_sigma(sigmaX, maxTextureSize, &scaleFactorX, &radiusX);
    sigmaY = adjust_sigma(sigmaY, maxTextureSize, &scaleFactorY, &radiusY);

    SkRect srcRect(rect);
    scale_rect(&srcRect, 1.0f / scaleFactorX, 1.0f / scaleFactorY);
    srcRect.roundOut(&srcRect);
    scale_rect(&srcRect, static_cast<float>(scaleFactorX),
                         static_cast<float>(scaleFactorY));

    // setup new clip
    GrClip clip(SkRect::MakeWH(srcRect.width(), srcRect.height()));

    SkASSERT(kBGRA_8888_GrPixelConfig == srcTexture->config() ||
             kRGBA_8888_GrPixelConfig == srcTexture->config() ||
             kAlpha_8_GrPixelConfig == srcTexture->config());

    GrSurfaceDesc desc;
    desc.fFlags = kRenderTarget_GrSurfaceFlag;
    desc.fWidth = SkScalarFloorToInt(srcRect.width());
    desc.fHeight = SkScalarFloorToInt(srcRect.height());
    desc.fConfig = srcTexture->config();

    GrTexture* dstTexture;
    GrTexture* tempTexture;
    SkAutoTUnref<GrTexture> temp1, temp2;

    temp1.reset(context->textureProvider()->refScratchTexture(
        desc, GrTextureProvider::kApprox_ScratchTexMatch));
    dstTexture = temp1.get();
    if (canClobberSrc) {
        tempTexture = srcTexture;
    } else {
        temp2.reset(context->textureProvider()->refScratchTexture(
            desc, GrTextureProvider::kApprox_ScratchTexMatch));
        tempTexture = temp2.get();
    }

    if (NULL == dstTexture || NULL == tempTexture) {
        return NULL;
    }

    GrDrawContext* drawContext = context->drawContext();
    if (!drawContext) {
        return NULL;
    }

    for (int i = 1; i < scaleFactorX || i < scaleFactorY; i *= 2) {
        GrPaint paint;
        SkMatrix matrix;
        matrix.setIDiv(srcTexture->width(), srcTexture->height());
        SkRect dstRect(srcRect);
        if (cropToRect && i == 1) {
            dstRect.offset(-dstRect.fLeft, -dstRect.fTop);
            SkRect domain;
            matrix.mapRect(&domain, rect);
            domain.inset(i < scaleFactorX ? SK_ScalarHalf / srcTexture->width() : 0.0f,
                         i < scaleFactorY ? SK_ScalarHalf / srcTexture->height() : 0.0f);
            SkAutoTUnref<GrFragmentProcessor> fp(   GrTextureDomainEffect::Create(
                srcTexture,
                matrix,
                domain,
                GrTextureDomain::kDecal_Mode,
                GrTextureParams::kBilerp_FilterMode));
            paint.addColorProcessor(fp);
        } else {
            GrTextureParams params(SkShader::kClamp_TileMode, GrTextureParams::kBilerp_FilterMode);
            paint.addColorTextureProcessor(srcTexture, matrix, params);
        }
        scale_rect(&dstRect, i < scaleFactorX ? 0.5f : 1.0f,
                             i < scaleFactorY ? 0.5f : 1.0f);
        drawContext->drawNonAARectToRect(dstTexture->asRenderTarget(), clip, paint, SkMatrix::I(),
                                         dstRect, srcRect);
        srcRect = dstRect;
        srcTexture = dstTexture;
        SkTSwap(dstTexture, tempTexture);
    }

    const SkIRect srcIRect = srcRect.roundOut();

    // For really small blurs(Certainly no wider than 5x5 on desktop gpus) it is faster to just
    // launch a single non separable kernel vs two launches
    if (sigmaX > 0.0f && sigmaY > 0 &&
            (2 * radiusX + 1) * (2 * radiusY + 1) <= MAX_KERNEL_SIZE) {
        // We shouldn't be scaling because this is a small size blur
        SkASSERT((scaleFactorX == scaleFactorY) == 1);
        SkRect dstRect = SkRect::MakeWH(srcRect.width(), srcRect.height());
        convolve_gaussian_2d(drawContext, dstTexture->asRenderTarget(), clip, srcRect, dstRect,
//.........这里部分代码省略.........

    void onOnceBeforeDraw() override {
        fPaint.setAntiAlias(true);
        fPaint.setLCDRenderText(fLCD);

        SkISize size = this->getISize();
        SkScalar w = SkIntToScalar(size.fWidth);
        SkScalar h = SkIntToScalar(size.fHeight);

        SK_COMPILE_ASSERT(4 == SK_ARRAY_COUNT(fTypefacesToUnref), typeface_cnt);
        fTypefacesToUnref[0] = sk_tool_utils::create_portable_typeface("sans-serif", SkTypeface::kNormal);
        fTypefacesToUnref[1] = sk_tool_utils::create_portable_typeface("sans-serif", SkTypeface::kBold);
        fTypefacesToUnref[2] = sk_tool_utils::create_portable_typeface("serif", SkTypeface::kNormal);
        fTypefacesToUnref[3] = sk_tool_utils::create_portable_typeface("serif", SkTypeface::kBold);

        SkRandom random;
        for (int i = 0; i < kCnt; ++i) {
            int length = random.nextRangeU(kMinLength, kMaxLength);
            char text[kMaxLength];
            for (int j = 0; j < length; ++j) {
                text[j] = (char)random.nextRangeU('!', 'z');
            }
            fStrings[i].set(text, length);

            fColors[i] = random.nextU();
            fColors[i] |= 0xFF000000;
            fColors[i] = sk_tool_utils::color_to_565(fColors[i]);

            static const SkScalar kMinPtSize = 8.f;
            static const SkScalar kMaxPtSize = 32.f;

            fPtSizes[i] = random.nextRangeScalar(kMinPtSize, kMaxPtSize);

            fTypefaces[i] = fTypefacesToUnref[
                random.nextULessThan(SK_ARRAY_COUNT(fTypefacesToUnref))];

            SkRect r;
            fPaint.setColor(fColors[i]);
            fPaint.setTypeface(fTypefaces[i]);
            fPaint.setTextSize(fPtSizes[i]);

            fPaint.measureText(fStrings[i].c_str(), fStrings[i].size(), &r);
            // safeRect is set of x,y positions where we can draw the string without hitting
            // the GM's border.
            SkRect safeRect = SkRect::MakeLTRB(-r.fLeft, -r.fTop, w - r.fRight, h - r.fBottom);
            if (safeRect.isEmpty()) {
                // If we don't fit then just don't worry about how we get cliped to the device
                // border.
                safeRect = SkRect::MakeWH(w, h);
            }
            fPositions[i].fX = random.nextRangeScalar(safeRect.fLeft, safeRect.fRight);
            fPositions[i].fY = random.nextRangeScalar(safeRect.fTop, safeRect.fBottom);

            fClipRects[i] = r;
            fClipRects[i].offset(fPositions[i].fX, fPositions[i].fY);
            fClipRects[i].outset(2.f, 2.f);

            if (fEffectiveClip) {
                fClipRects[i].fRight -= 0.25f * fClipRects[i].width();
            }
        }
    }

    virtual void onDraw(SkCanvas* canvas) {
        struct FillAndName {
            SkPath::FillType fFill;
            const char*      fName;
        };
        static const FillAndName gFills[] = {
            {SkPath::kWinding_FillType, "Winding"},
            {SkPath::kEvenOdd_FillType, "Even / Odd"},
            {SkPath::kInverseWinding_FillType, "Inverse Winding"},
            {SkPath::kInverseEvenOdd_FillType, "Inverse Even / Odd"},
        };
        struct StyleAndName {
            SkPaint::Style fStyle;
            const char*    fName;
        };
        static const StyleAndName gStyles[] = {
            {SkPaint::kFill_Style, "Fill"},
            {SkPaint::kStroke_Style, "Stroke"},
            {SkPaint::kStrokeAndFill_Style, "Stroke And Fill"},
        };
        struct CapAndName {
            SkPaint::Cap  fCap;
            SkPaint::Join fJoin;
            const char*   fName;
        };
        static const CapAndName gCaps[] = {
            {SkPaint::kButt_Cap, SkPaint::kBevel_Join, "Butt"},
            {SkPaint::kRound_Cap, SkPaint::kRound_Join, "Round"},
            {SkPaint::kSquare_Cap, SkPaint::kBevel_Join, "Square"}
        };
        struct PathAndName {
            SkPath      fPath;
            const char* fName;
        };
        PathAndName path;
        path.fPath.moveTo(25*SK_Scalar1, 15*SK_Scalar1);
        path.fPath.lineTo(75*SK_Scalar1, 15*SK_Scalar1);
        path.fName = "moveTo-line";

        SkPaint titlePaint;
        titlePaint.setColor(SK_ColorBLACK);
        titlePaint.setAntiAlias(true);
        titlePaint.setLCDRenderText(true);
        titlePaint.setTextSize(15 * SK_Scalar1);
        const char title[] = "Line Drawn Into Rectangle Clips With "
                             "Indicated Style, Fill and Linecaps, with stroke width 10";
        canvas->drawText(title, strlen(title),
                         20 * SK_Scalar1,
                         20 * SK_Scalar1,
                         titlePaint);

        SkLCGRandom rand;
        SkRect rect = SkRect::MakeWH(100*SK_Scalar1, 30*SK_Scalar1);
        canvas->save();
        canvas->translate(10 * SK_Scalar1, 30 * SK_Scalar1);
        canvas->save();
        for (size_t cap = 0; cap < SK_ARRAY_COUNT(gCaps); ++cap) {
            if (0 < cap) {
                canvas->translate((rect.width() + 40 * SK_Scalar1) * SK_ARRAY_COUNT(gStyles), 0);
            }
            canvas->save();
            for (size_t fill = 0; fill < SK_ARRAY_COUNT(gFills); ++fill) {
                if (0 < fill) {
                    canvas->translate(0, rect.height() + 40 * SK_Scalar1);
                }
                canvas->save();
                for (size_t style = 0; style < SK_ARRAY_COUNT(gStyles); ++style) {
                    if (0 < style) {
                        canvas->translate(rect.width() + 40 * SK_Scalar1, 0);
                    }

                    SkColor color = 0xff007000;
                    this->drawPath(path.fPath, canvas, color, rect,
                                   gCaps[cap].fCap, gCaps[cap].fJoin, gStyles[style].fStyle,
                                   gFills[fill].fFill, SK_Scalar1*10);

                    SkPaint rectPaint;
                    rectPaint.setColor(SK_ColorBLACK);
                    rectPaint.setStyle(SkPaint::kStroke_Style);
                    rectPaint.setStrokeWidth(-1);
                    rectPaint.setAntiAlias(true);
                    canvas->drawRect(rect, rectPaint);

                    SkPaint labelPaint;
                    labelPaint.setColor(color);
                    labelPaint.setAntiAlias(true);
                    labelPaint.setLCDRenderText(true);
                    labelPaint.setTextSize(10 * SK_Scalar1);
                    canvas->drawText(gStyles[style].fName,
                                     strlen(gStyles[style].fName),
                                     0, rect.height() + 12 * SK_Scalar1,
                                     labelPaint);
                    canvas->drawText(gFills[fill].fName,
                                     strlen(gFills[fill].fName),
                                     0, rect.height() + 24 * SK_Scalar1,
                                     labelPaint);
                    canvas->drawText(gCaps[cap].fName,
                                     strlen(gCaps[cap].fName),
                                     0, rect.height() + 36 * SK_Scalar1,
                                     labelPaint);
//.........这里部分代码省略.........

void GLCircularRRectEffect::onSetData(const GrGLProgramDataManager& pdman,
                                    const GrProcessor& processor) {
    const CircularRRectEffect& crre = processor.cast<CircularRRectEffect>();
    const SkRRect& rrect = crre.getRRect();
    if (rrect != fPrevRRect) {
        SkRect rect = rrect.getBounds();
        SkScalar radius = 0;
        switch (crre.getCircularCornerFlags()) {
            case CircularRRectEffect::kAll_CornerFlags:
                SkASSERT(rrect.isSimpleCircular());
                radius = rrect.getSimpleRadii().fX;
                SkASSERT(radius >= kRadiusMin);
                rect.inset(radius, radius);
                break;
            case CircularRRectEffect::kTopLeft_CornerFlag:
                radius = rrect.radii(SkRRect::kUpperLeft_Corner).fX;
                rect.fLeft += radius;
                rect.fTop += radius;
                rect.fRight += 0.5f;
                rect.fBottom += 0.5f;
                break;
            case CircularRRectEffect::kTopRight_CornerFlag:
                radius = rrect.radii(SkRRect::kUpperRight_Corner).fX;
                rect.fLeft -= 0.5f;
                rect.fTop += radius;
                rect.fRight -= radius;
                rect.fBottom += 0.5f;
                break;
            case CircularRRectEffect::kBottomRight_CornerFlag:
                radius = rrect.radii(SkRRect::kLowerRight_Corner).fX;
                rect.fLeft -= 0.5f;
                rect.fTop -= 0.5f;
                rect.fRight -= radius;
                rect.fBottom -= radius;
                break;
            case CircularRRectEffect::kBottomLeft_CornerFlag:
                radius = rrect.radii(SkRRect::kLowerLeft_Corner).fX;
                rect.fLeft += radius;
                rect.fTop -= 0.5f;
                rect.fRight += 0.5f;
                rect.fBottom -= radius;
                break;
            case CircularRRectEffect::kLeft_CornerFlags:
                radius = rrect.radii(SkRRect::kUpperLeft_Corner).fX;
                rect.fLeft += radius;
                rect.fTop += radius;
                rect.fRight += 0.5f;
                rect.fBottom -= radius;
                break;
            case CircularRRectEffect::kTop_CornerFlags:
                radius = rrect.radii(SkRRect::kUpperLeft_Corner).fX;
                rect.fLeft += radius;
                rect.fTop += radius;
                rect.fRight -= radius;
                rect.fBottom += 0.5f;
                break;
            case CircularRRectEffect::kRight_CornerFlags:
                radius = rrect.radii(SkRRect::kUpperRight_Corner).fX;
                rect.fLeft -= 0.5f;
                rect.fTop += radius;
                rect.fRight -= radius;
                rect.fBottom -= radius;
                break;
            case CircularRRectEffect::kBottom_CornerFlags:
                radius = rrect.radii(SkRRect::kLowerLeft_Corner).fX;
                rect.fLeft += radius;
                rect.fTop -= 0.5f;
                rect.fRight -= radius;
                rect.fBottom -= radius;
                break;
            default:
                SkFAIL("Should have been one of the above cases.");
        }
        pdman.set4f(fInnerRectUniform, rect.fLeft, rect.fTop, rect.fRight, rect.fBottom);
        pdman.set1f(fRadiusPlusHalfUniform, radius + 0.5f);
        fPrevRRect = rrect;
    }
}

    virtual void onDrawContent(SkCanvas* canvas) {
        struct FillAndName {
            SkPath::FillType fFill;
            const char*      fName;
        };
        static const FillAndName gFills[] = {
            {SkPath::kWinding_FillType, "Winding"},
            {SkPath::kEvenOdd_FillType, "Even / Odd"},
            {SkPath::kInverseWinding_FillType, "Inverse Winding"},
            {SkPath::kInverseEvenOdd_FillType, "Inverse Even / Odd"},
        };
        struct StyleAndName {
            SkPaint::Style fStyle;
            const char*    fName;
        };
        static const StyleAndName gStyles[] = {
            {SkPaint::kFill_Style, "Fill"},
            {SkPaint::kStroke_Style, "Stroke"},
            {SkPaint::kStrokeAndFill_Style, "Stroke And Fill"},
        };

        SkPaint titlePaint;
        titlePaint.setColor(SK_ColorBLACK);
        titlePaint.setAntiAlias(true);
        titlePaint.setLCDRenderText(true);
        titlePaint.setTextSize(24 * SK_Scalar1);
        const char title[] = "Empty Paths Drawn Into Rectangle Clips With Indicated Style and Fill";
        canvas->drawText(title, strlen(title),
                         40 * SK_Scalar1,
                         100*SK_Scalar1,
                         titlePaint);

        SkRandom rand;
        SkRect rect = SkRect::MakeWH(125*SK_Scalar1, 100*SK_Scalar1);
        int i = 0;
        canvas->save();
        canvas->translate(80 * SK_Scalar1, 0);
        canvas->save();
        for (size_t style = 0; style < SK_ARRAY_COUNT(gStyles); ++style) {
            for (size_t fill = 0; fill < SK_ARRAY_COUNT(gFills); ++fill) {
                if (0 == i % 4) {
                    canvas->restore();
                    canvas->translate(0, rect.height() + 50 * SK_Scalar1);
                    canvas->save();
                } else {
                    canvas->translate(rect.width() + 100 * SK_Scalar1, 0);
                }
                ++i;


                SkColor color = rand.nextU();
                color = 0xff000000| color; // force solid
                this->drawEmpty(canvas, color, rect,
                                gStyles[style].fStyle, gFills[fill].fFill);

                SkPaint rectPaint;
                rectPaint.setColor(SK_ColorBLACK);
                rectPaint.setStyle(SkPaint::kStroke_Style);
                rectPaint.setStrokeWidth(-1);
                rectPaint.setAntiAlias(true);
                canvas->drawRect(rect, rectPaint);

                char label[1024];
                sprintf(label, "%s, %s", gStyles[style].fName,
                                         gFills[fill].fName);
                SkPaint labelPaint;
                labelPaint.setColor(color);
                labelPaint.setAntiAlias(true);
                labelPaint.setLCDRenderText(true);
                canvas->drawText(label, strlen(label), 
                                 0, rect.height() + 15 * SK_Scalar1,
                                 labelPaint);
            }
        }
        canvas->restore();
        canvas->restore();
    }

bool GrStencilAndCoverPathRenderer::onDrawPath(const DrawPathArgs& args) {
    SkASSERT(!args.fStroke->isHairlineStyle());
    const SkPath& path = *args.fPath;
    GrPipelineBuilder* pipelineBuilder = args.fPipelineBuilder;
    const SkMatrix& viewMatrix = *args.fViewMatrix;

    SkASSERT(pipelineBuilder->getStencil().isDisabled());

    if (args.fAntiAlias) {
        SkASSERT(pipelineBuilder->getRenderTarget()->isStencilBufferMultisampled());
        pipelineBuilder->enableState(GrPipelineBuilder::kHWAntialias_Flag);
    }

    SkAutoTUnref<GrPath> p(get_gr_path(fResourceProvider, path, *args.fStroke));

    if (path.isInverseFillType()) {
        GR_STATIC_CONST_SAME_STENCIL(kInvertedStencilPass,
            kKeep_StencilOp,
            kZero_StencilOp,
            // We know our rect will hit pixels outside the clip and the user bits will be 0
            // outside the clip. So we can't just fill where the user bits are 0. We also need to
            // check that the clip bit is set.
            kEqualIfInClip_StencilFunc,
            0xffff,
            0x0000,
            0xffff);

        pipelineBuilder->setStencil(kInvertedStencilPass);

        // fake inverse with a stencil and cover
        args.fTarget->stencilPath(*pipelineBuilder, viewMatrix, p, p->getFillType());

        SkMatrix invert = SkMatrix::I();
        SkRect bounds =
            SkRect::MakeLTRB(0, 0, SkIntToScalar(pipelineBuilder->getRenderTarget()->width()),
                             SkIntToScalar(pipelineBuilder->getRenderTarget()->height()));
        SkMatrix vmi;
        // mapRect through persp matrix may not be correct
        if (!viewMatrix.hasPerspective() && viewMatrix.invert(&vmi)) {
            vmi.mapRect(&bounds);
            // theoretically could set bloat = 0, instead leave it because of matrix inversion
            // precision.
            SkScalar bloat = viewMatrix.getMaxScale() * SK_ScalarHalf;
            bounds.outset(bloat, bloat);
        } else {
            if (!viewMatrix.invert(&invert)) {
                return false;
            }
        }
        const SkMatrix& viewM = viewMatrix.hasPerspective() ? SkMatrix::I() : viewMatrix;
        if (pipelineBuilder->getRenderTarget()->hasMixedSamples()) {
            pipelineBuilder->disableState(GrPipelineBuilder::kHWAntialias_Flag);
        }
        args.fTarget->drawNonAARect(*pipelineBuilder, args.fColor, viewM, bounds, invert);
    } else {
        GR_STATIC_CONST_SAME_STENCIL(kStencilPass,
            kZero_StencilOp,
            kKeep_StencilOp,
            kNotEqual_StencilFunc,
            0xffff,
            0x0000,
            0xffff);

        pipelineBuilder->setStencil(kStencilPass);
        SkAutoTUnref<GrDrawPathBatchBase> batch(
                GrDrawPathBatch::Create(viewMatrix, args.fColor, p->getFillType(), p));
        args.fTarget->drawPathBatch(*pipelineBuilder, batch);
    }

    pipelineBuilder->stencil()->setDisabled();
    return true;
}

void GrAARectRenderer::StrokeAARect(GrDrawTarget* target,
                                    GrPipelineBuilder* pipelineBuilder,
                                    GrColor color,
                                    const SkMatrix& viewMatrix,
                                    const SkRect& rect,
                                    const SkRect& devRect,
                                    const SkStrokeRec& stroke) {
    SkVector devStrokeSize;
    SkScalar width = stroke.getWidth();
    if (width > 0) {
        devStrokeSize.set(width, width);
        viewMatrix.mapVectors(&devStrokeSize, 1);
        devStrokeSize.setAbs(devStrokeSize);
    } else {
        devStrokeSize.set(SK_Scalar1, SK_Scalar1);
    }

    const SkScalar dx = devStrokeSize.fX;
    const SkScalar dy = devStrokeSize.fY;
    const SkScalar rx = SkScalarMul(dx, SK_ScalarHalf);
    const SkScalar ry = SkScalarMul(dy, SK_ScalarHalf);

    SkScalar spare;
    {
        SkScalar w = devRect.width() - dx;
        SkScalar h = devRect.height() - dy;
        spare = SkTMin(w, h);
    }

    SkRect devOutside(devRect);
    devOutside.outset(rx, ry);

    bool miterStroke = true;
    // For hairlines, make bevel and round joins appear the same as mitered ones.
    // small miter limit means right angles show bevel...
    if ((width > 0) && (stroke.getJoin() != SkPaint::kMiter_Join ||
                        stroke.getMiter() < SK_ScalarSqrt2)) {
        miterStroke = false;
    }

    if (spare <= 0 && miterStroke) {
        FillAARect(target, pipelineBuilder, color, viewMatrix, devOutside, devOutside);
        return;
    }

    SkRect devInside(devRect);
    devInside.inset(rx, ry);

    SkRect devOutsideAssist(devRect);

    // For bevel-stroke, use 2 SkRect instances(devOutside and devOutsideAssist)
    // to draw the outer of the rect. Because there are 8 vertices on the outer
    // edge, while vertex number of inner edge is 4, the same as miter-stroke.
    if (!miterStroke) {
        devOutside.inset(0, ry);
        devOutsideAssist.outset(0, ry);
    }

    GeometryStrokeAARect(target, pipelineBuilder, color, viewMatrix, devOutside,
                         devOutsideAssist, devInside, miterStroke);
}

void SkBBoxHierarchyRecord::handleBBox(const SkRect& bounds) {
    SkIRect r;
    bounds.roundOut(&r);
    SkPictureStateTree::Draw* draw = fStateTree->appendDraw(this->writeStream().bytesWritten());
    fBoundingHierarchy->insert(draw, r, true);
}

void SkBitmapDevice::drawBitmapRect(const SkDraw& draw, const SkBitmap& bitmap,
                                    const SkRect* src, const SkRect& dst,
                                    const SkPaint& paint,
                                    SkCanvas::DrawBitmapRectFlags flags) {
    SkMatrix    matrix;
    SkRect      bitmapBounds, tmpSrc, tmpDst;
    SkBitmap    tmpBitmap;

    bitmapBounds.isetWH(bitmap.width(), bitmap.height());

    // Compute matrix from the two rectangles
    if (src) {
        tmpSrc = *src;
    } else {
        tmpSrc = bitmapBounds;
    }
    matrix.setRectToRect(tmpSrc, dst, SkMatrix::kFill_ScaleToFit);

    const SkRect* dstPtr = &dst;
    const SkBitmap* bitmapPtr = &bitmap;

    // clip the tmpSrc to the bounds of the bitmap, and recompute dstRect if
    // needed (if the src was clipped). No check needed if src==null.
    if (src) {
        if (!bitmapBounds.contains(*src)) {
            if (!tmpSrc.intersect(bitmapBounds)) {
                return; // nothing to draw
            }
            // recompute dst, based on the smaller tmpSrc
            matrix.mapRect(&tmpDst, tmpSrc);
            dstPtr = &tmpDst;
        }

        // since we may need to clamp to the borders of the src rect within
        // the bitmap, we extract a subset.
        SkIRect srcIR;
        tmpSrc.roundOut(&srcIR);
        if(bitmap.pixelRef()->getTexture()) {
            // Accelerated source canvas, don't use extractSubset but readPixels to get the subset.
            // This way, the pixels are copied in CPU memory instead of GPU memory.
            bitmap.pixelRef()->readPixels(&tmpBitmap, &srcIR);
        } else {
            if (!bitmap.extractSubset(&tmpBitmap, srcIR)) {
                return;
            }
        }
        bitmapPtr = &tmpBitmap;

        // Since we did an extract, we need to adjust the matrix accordingly
        SkScalar dx = 0, dy = 0;
        if (srcIR.fLeft > 0) {
            dx = SkIntToScalar(srcIR.fLeft);
        }
        if (srcIR.fTop > 0) {
            dy = SkIntToScalar(srcIR.fTop);
        }
        if (dx || dy) {
            matrix.preTranslate(dx, dy);
        }

        SkRect extractedBitmapBounds;
        extractedBitmapBounds.isetWH(bitmapPtr->width(), bitmapPtr->height());
        if (extractedBitmapBounds == tmpSrc) {
            // no fractional part in src, we can just call drawBitmap
            goto USE_DRAWBITMAP;
        }
    } else {
        USE_DRAWBITMAP:
        // We can go faster by just calling drawBitmap, which will concat the
        // matrix with the CTM, and try to call drawSprite if it can. If not,
        // it will make a shader and call drawRect, as we do below.
        this->drawBitmap(draw, *bitmapPtr, matrix, paint);
        return;
    }

    // construct a shader, so we can call drawRect with the dst
    SkShader* s = SkShader::CreateBitmapShader(*bitmapPtr,
                                               SkShader::kClamp_TileMode,
                                               SkShader::kClamp_TileMode,
                                               &matrix);
    if (NULL == s) {
        return;
    }

    SkPaint paintWithShader(paint);
    paintWithShader.setStyle(SkPaint::kFill_Style);
    paintWithShader.setShader(s)->unref();

    // Call ourself, in case the subclass wanted to share this setup code
    // but handle the drawRect code themselves.
    this->drawRect(draw, *dstPtr, paintWithShader);
}

    void generateAAFillRectGeometry(void* vertices,
                                    size_t offset,
                                    size_t vertexStride,
                                    GrColor color,
                                    const SkMatrix& viewMatrix,
                                    const SkRect& rect,
                                    const SkRect& devRect,
                                    bool tweakAlphaForCoverage) const {
        intptr_t verts = reinterpret_cast<intptr_t>(vertices) + offset;

        SkPoint* fan0Pos = reinterpret_cast<SkPoint*>(verts);
        SkPoint* fan1Pos = reinterpret_cast<SkPoint*>(verts + 4 * vertexStride);

        SkScalar inset = SkMinScalar(devRect.width(), SK_Scalar1);
        inset = SK_ScalarHalf * SkMinScalar(inset, devRect.height());

        if (viewMatrix.rectStaysRect()) {
            set_inset_fan(fan0Pos, vertexStride, devRect, -SK_ScalarHalf, -SK_ScalarHalf);
            set_inset_fan(fan1Pos, vertexStride, devRect, inset,  inset);
        } else {
            // compute transformed (1, 0) and (0, 1) vectors
            SkVector vec[2] = {
              { viewMatrix[SkMatrix::kMScaleX], viewMatrix[SkMatrix::kMSkewY] },
              { viewMatrix[SkMatrix::kMSkewX],  viewMatrix[SkMatrix::kMScaleY] }
            };

            vec[0].normalize();
            vec[0].scale(SK_ScalarHalf);
            vec[1].normalize();
            vec[1].scale(SK_ScalarHalf);

            // create the rotated rect
            fan0Pos->setRectFan(rect.fLeft, rect.fTop,
                                rect.fRight, rect.fBottom, vertexStride);
            viewMatrix.mapPointsWithStride(fan0Pos, vertexStride, 4);

            // Now create the inset points and then outset the original
            // rotated points

            // TL
            *((SkPoint*)((intptr_t)fan1Pos + 0 * vertexStride)) =
                *((SkPoint*)((intptr_t)fan0Pos + 0 * vertexStride)) + vec[0] + vec[1];
            *((SkPoint*)((intptr_t)fan0Pos + 0 * vertexStride)) -= vec[0] + vec[1];
            // BL
            *((SkPoint*)((intptr_t)fan1Pos + 1 * vertexStride)) =
                *((SkPoint*)((intptr_t)fan0Pos + 1 * vertexStride)) + vec[0] - vec[1];
            *((SkPoint*)((intptr_t)fan0Pos + 1 * vertexStride)) -= vec[0] - vec[1];
            // BR
            *((SkPoint*)((intptr_t)fan1Pos + 2 * vertexStride)) =
                *((SkPoint*)((intptr_t)fan0Pos + 2 * vertexStride)) - vec[0] - vec[1];
            *((SkPoint*)((intptr_t)fan0Pos + 2 * vertexStride)) += vec[0] + vec[1];
            // TR
            *((SkPoint*)((intptr_t)fan1Pos + 3 * vertexStride)) =
                *((SkPoint*)((intptr_t)fan0Pos + 3 * vertexStride)) - vec[0] + vec[1];
            *((SkPoint*)((intptr_t)fan0Pos + 3 * vertexStride)) += vec[0] - vec[1];
        }

        // Make verts point to vertex color and then set all the color and coverage vertex attrs
        // values.
        verts += sizeof(SkPoint);
        for (int i = 0; i < 4; ++i) {
            if (tweakAlphaForCoverage) {
                *reinterpret_cast<GrColor*>(verts + i * vertexStride) = 0;
            } else {
                *reinterpret_cast<GrColor*>(verts + i * vertexStride) = color;
                *reinterpret_cast<float*>(verts + i * vertexStride + sizeof(GrColor)) = 0;
            }
        }

        int scale;
        if (inset < SK_ScalarHalf) {
            scale = SkScalarFloorToInt(512.0f * inset / (inset + SK_ScalarHalf));
            SkASSERT(scale >= 0 && scale <= 255);
        } else {
            scale = 0xff;
        }

        verts += 4 * vertexStride;

        float innerCoverage = GrNormalizeByteToFloat(scale);
        GrColor scaledColor = (0xff == scale) ? color : SkAlphaMulQ(color, scale);

        for (int i = 0; i < 4; ++i) {
            if (tweakAlphaForCoverage) {
                *reinterpret_cast<GrColor*>(verts + i * vertexStride) = scaledColor;
            } else {
                *reinterpret_cast<GrColor*>(verts + i * vertexStride) = color;
                *reinterpret_cast<float*>(verts + i * vertexStride +
                                          sizeof(GrColor)) = innerCoverage;
            }
        }
    }

void SkDeferredCanvas::flush_translate(SkScalar* x, SkScalar* y, const SkPaint& paint) {
    SkRect tmp = SkRect::MakeXYWH(*x, *y, 1, 1);
    this->flush_check(&tmp, &paint, kNoClip_Flag | kNoCull_Flag | kNoScale_Flag);
    *x = tmp.x();
    *y = tmp.y();
}

GrTexture* GaussianBlur(GrContext* context,
                        GrTexture* srcTexture,
                        bool canClobberSrc,
                        const SkRect& rect,
                        bool cropToRect,
                        float sigmaX,
                        float sigmaY) {
    SkASSERT(NULL != context);

    GrContext::AutoRenderTarget art(context);

    GrContext::AutoMatrix am;
    am.setIdentity(context);

    SkIRect clearRect;
    int scaleFactorX, radiusX;
    int scaleFactorY, radiusY;
    sigmaX = adjust_sigma(sigmaX, &scaleFactorX, &radiusX);
    sigmaY = adjust_sigma(sigmaY, &scaleFactorY, &radiusY);

    SkRect srcRect(rect);
    scale_rect(&srcRect, 1.0f / scaleFactorX, 1.0f / scaleFactorY);
    srcRect.roundOut();
    scale_rect(&srcRect, static_cast<float>(scaleFactorX),
                         static_cast<float>(scaleFactorY));

    GrContext::AutoClip acs(context, SkRect::MakeWH(srcRect.width(), srcRect.height()));

    SkASSERT(kBGRA_8888_GrPixelConfig == srcTexture->config() ||
             kRGBA_8888_GrPixelConfig == srcTexture->config() ||
             kAlpha_8_GrPixelConfig == srcTexture->config());

    GrTextureDesc desc;
    desc.fFlags = kRenderTarget_GrTextureFlagBit | kNoStencil_GrTextureFlagBit;
    desc.fWidth = SkScalarFloorToInt(srcRect.width());
    desc.fHeight = SkScalarFloorToInt(srcRect.height());
    desc.fConfig = srcTexture->config();

    GrAutoScratchTexture temp1, temp2;
    GrTexture* dstTexture = temp1.set(context, desc);
    GrTexture* tempTexture = canClobberSrc ? srcTexture : temp2.set(context, desc);
    if (NULL == dstTexture || NULL == tempTexture) {
        return NULL;
    }

    for (int i = 1; i < scaleFactorX || i < scaleFactorY; i *= 2) {
        GrPaint paint;
        SkMatrix matrix;
        matrix.setIDiv(srcTexture->width(), srcTexture->height());
        context->setRenderTarget(dstTexture->asRenderTarget());
        SkRect dstRect(srcRect);
        if (cropToRect && i == 1) {
            dstRect.offset(-dstRect.fLeft, -dstRect.fTop);
            SkRect domain;
            matrix.mapRect(&domain, rect);
            domain.inset(i < scaleFactorX ? SK_ScalarHalf / srcTexture->width() : 0.0f,
                         i < scaleFactorY ? SK_ScalarHalf / srcTexture->height() : 0.0f);
            SkAutoTUnref<GrEffectRef> effect(GrTextureDomainEffect::Create(
                srcTexture,
                matrix,
                domain,
                GrTextureDomain::kDecal_Mode,
                GrTextureParams::kBilerp_FilterMode));
            paint.addColorEffect(effect);
        } else {
            GrTextureParams params(SkShader::kClamp_TileMode, GrTextureParams::kBilerp_FilterMode);
            paint.addColorTextureEffect(srcTexture, matrix, params);
        }
        scale_rect(&dstRect, i < scaleFactorX ? 0.5f : 1.0f,
                             i < scaleFactorY ? 0.5f : 1.0f);
        context->drawRectToRect(paint, dstRect, srcRect);
        srcRect = dstRect;
        srcTexture = dstTexture;
        SkTSwap(dstTexture, tempTexture);
    }

    SkIRect srcIRect;
    srcRect.roundOut(&srcIRect);

    if (sigmaX > 0.0f) {
        if (scaleFactorX > 1) {
            // Clear out a radius to the right of the srcRect to prevent the
            // X convolution from reading garbage.
            clearRect = SkIRect::MakeXYWH(srcIRect.fRight, srcIRect.fTop,
                                          radiusX, srcIRect.height());
            context->clear(&clearRect, 0x0, false);
        }
        context->setRenderTarget(dstTexture->asRenderTarget());
        SkRect dstRect = SkRect::MakeWH(srcRect.width(), srcRect.height());
        convolve_gaussian(context, srcRect, dstRect, srcTexture,
                          Gr1DKernelEffect::kX_Direction, radiusX, sigmaX, cropToRect);
        srcTexture = dstTexture;
        srcRect = dstRect;
        SkTSwap(dstTexture, tempTexture);
    }

    if (sigmaY > 0.0f) {
        if (scaleFactorY > 1 || sigmaX > 0.0f) {
            // Clear out a radius below the srcRect to prevent the Y
            // convolution from reading garbage.
//.........这里部分代码省略.........

void drawTextOverCanvas(RenderingContext* rc, SkCanvas* cv) {
	SkRect r = SkRect::MakeLTRB(0, 0, rc->width, rc->height);
	r.inset(-100, -100);
	quad_tree<TextDrawInfo*> boundsIntersect(r, 4, 0.6);

	SkPaint paintIcon;
	paintIcon.setStyle(SkPaint::kStroke_Style);
	paintIcon.setStrokeWidth(1);
	paintIcon.setColor(0xff000000);
	SkPaint paintText;
	paintText.setStyle(SkPaint::kFill_Style);
	paintText.setStrokeWidth(1);
	paintText.setColor(0xff000000);
	paintText.setTextAlign(SkPaint::kCenter_Align);
	paintText.setTypeface(serif);
	paintText.setAntiAlias(true);
	SkPaint::FontMetrics fm;

	// 1. Sort text using text order
	std::sort(rc->textToDraw.begin(), rc->textToDraw.end(), textOrder);
	uint size = rc->textToDraw.size();
	for (uint i = 0; i < size; i++) {
		TextDrawInfo* text = rc->textToDraw.at(i);
		if (text->text.length() > 0) {
			size_t d = text->text.find(DELIM_CHAR);
			// not used now functionality
			// possibly it will be used specifying english names after that character
			if (d > 0) {
				text->text = text->text.substr(0, d);
			}

			// sest text size before finding intersection (it is used there)
			float textSize = getDensityValue(rc, text->textSize);
			paintText.setTextSize(textSize);
			paintText.setFakeBoldText(text->bold);
			paintText.setColor(text->textColor);
			// align center y
			paintText.getFontMetrics(&fm);
			text->centerY += (-fm.fAscent);

			// calculate if there is intersection
			bool intersects = findTextIntersection(cv, rc, boundsIntersect, text, &paintText, &paintIcon);
			if (!intersects) {
				if(rc->interrupted()){
						return;
				}
				if (text->drawOnPath && text->path != NULL) {
					if (text->textShadow > 0) {
						paintText.setColor(0xFFFFFFFF);
						paintText.setStyle(SkPaint::kStroke_Style);
						paintText.setStrokeWidth(2 + text->textShadow);
						rc->nativeOperations.pause();
						cv->drawTextOnPathHV(text->text.c_str(), text->text.length(), *text->path, text->hOffset,
								text->vOffset, paintText);
						rc->nativeOperations.start();
						// reset
						paintText.setStyle(SkPaint::kFill_Style);
						paintText.setStrokeWidth(2);
						paintText.setColor(text->textColor);
					}
					rc->nativeOperations.pause();
					cv->drawTextOnPathHV(text->text.c_str(), text->text.length(), *text->path, text->hOffset,
							text->vOffset, paintText);
					rc->nativeOperations.start();
				} else {
					if (text->shieldRes.length() > 0) {
						SkBitmap* ico = getCachedBitmap(rc, text->shieldRes);
						if (ico != NULL) {
							rc->nativeOperations.pause();
							cv->drawBitmap(*ico, text->centerX - ico->width() / 2 - 0.5f,
									text->centerY - ico->height() / 2 - getDensityValue(rc, 4.5f), &paintIcon);
							rc->nativeOperations.start();
						}
					}
					drawWrappedText(rc, cv, text, textSize, paintText);
				}
			}
		}
	}
}

static SkRect inset(const SkRect& r) {
    SkRect rect = r;
    rect.inset(r.width() / 8, r.height() / 8);
    return rect;
}