C++ SkRect::offset方法代码示例

    // Just draw a blurred rect at each of the four corners of a square (centered at x,y).
    // Use two clips to define a rectori where we want pixels to appear.
    void draw0x0(SkCanvas* canvas, SkScalar x, SkScalar y) {
        SkRect innerClip = { -kHalfSquareSize, -kHalfSquareSize, kHalfSquareSize, kHalfSquareSize };
        innerClip.offset(x, y);

        SkRect outerClip = {
            -kHalfOuterClipSize-kHalfSquareSize, -kHalfOuterClipSize-kHalfSquareSize,
             kHalfOuterClipSize+kHalfSquareSize,  kHalfOuterClipSize+kHalfSquareSize
        };
        outerClip.offset(x, y);

        canvas->save();
        canvas->clipRect(outerClip, SkCanvas::kIntersect_Op);
        canvas->clipRect(innerClip, SkCanvas::kDifference_Op);

        SkPaint paint;
        paint.setAntiAlias(true);
        paint.setMaskFilter(MakeBlur());

        for (int i = 0; i < 4; ++i) {
            paint.setColor(gColors[i]);

            SkRect rect = { -kHalfSquareSize, -kHalfSquareSize, kHalfSquareSize, kHalfSquareSize };
            rect.offset(gBlurOffsets[i]);
            rect.offset(x, y);
            canvas->drawRect(rect, paint);
        }

        canvas->restore();
    }

static void test_strokerect(SkCanvas* canvas)
    {
    canvas->drawColor(SK_ColorWHITE);

    SkRect r;

    r.set(10, 10, 14, 14);
    r.offset(0.25f, 0.3333f);
    test_strokerect(canvas, r);
    canvas->translate(0, 20);

    r.set(10, 10, 14.5f, 14.5f);
    r.offset(0.25f, 0.3333f);
    test_strokerect(canvas, r);
    canvas->translate(0, 20);

    r.set(10, 10, 14.5f, 20);
    r.offset(0.25f, 0.3333f);
    test_strokerect(canvas, r);
    canvas->translate(0, 20);

    r.set(10, 10, 20, 14.5f);
    r.offset(0.25f, 0.3333f);
    test_strokerect(canvas, r);
    canvas->translate(0, 20);

    r.set(10, 10, 20, 20);
    r.offset(0.25f, 0.3333f);
    test_strokerect(canvas, r);
    canvas->translate(0, 20);

    }

    void draw_mode(SkCanvas* canvas, SkXfermode* mode, int alpha,
                   SkScalar x, SkScalar y) {
        SkPaint p;
        SkMaskFilter* mf = SkBlurMaskFilter::Create(5, SkBlurMaskFilter::kNormal_BlurStyle, 0);
        p.setMaskFilter(mf)->unref();

        SkScalar ww = SkIntToScalar(W);
        SkScalar hh = SkIntToScalar(H);

        // draw a circle covering the upper
        // left three quarters of the canvas
        p.setColor(0xFFCC44FF);
        SkRect r;
        r.set(0, 0, ww*3/4, hh*3/4);
        r.offset(x, y);
        canvas->drawOval(r, p);

        p.setXfermode(mode);

        // draw a square overlapping the circle
        // in the lower right of the canvas
        p.setColor(0x00AA6633 | alpha << 24);
        r.set(ww/3, hh/3, ww*19/20, hh*19/20);
        r.offset(x, y);
        canvas->drawRect(r, p);
    }

static void show_bm(SkCanvas* canvas, int width, int height, SkColor color) {
    SkBitmap bm;
    make_bm(&bm, width, height, color);

    SkPaint paint;
    SkRect r;
    SkIRect ir;

    paint.setStyle(SkPaint::kStroke_Style);

    ir.set(0, 0, 128, 128);
    r.set(ir);

    canvas->save();
    canvas->clipRect(r);
    canvas->drawBitmap(bm, 0, 0, NULL);
    canvas->restore();
    canvas->drawRect(r, paint);

    r.offset(SkIntToScalar(150), 0);
    // exercises extract bitmap, but not shader
    canvas->drawBitmapRect(bm, &ir, r, NULL);
    canvas->drawRect(r, paint);

    r.offset(SkIntToScalar(150), 0);
    // exercises bitmapshader
    canvas->drawBitmapRect(bm, NULL, r, NULL);
    canvas->drawRect(r, paint);
}

    void draw_mode(SkCanvas* canvas, SkBlendMode mode, int alpha, SkScalar x, SkScalar y) {
        SkPaint p;
        p.setMaskFilter(SkBlurMaskFilter::Make(kNormal_SkBlurStyle,
                                               SkBlurMask::ConvertRadiusToSigma(5),
                                               SkBlurMaskFilter::kNone_BlurFlag));

        SkScalar ww = SkIntToScalar(W);
        SkScalar hh = SkIntToScalar(H);

        // draw a circle covering the upper
        // left three quarters of the canvas
        p.setColor(0xFFCC44FF);
        SkRect r;
        r.set(0, 0, ww*3/4, hh*3/4);
        r.offset(x, y);
        canvas->drawOval(r, p);

        p.setBlendMode(mode);

        // draw a square overlapping the circle
        // in the lower right of the canvas
        p.setColor(0x00AA6633 | alpha << 24);
        r.set(ww/3, hh/3, ww*19/20, hh*19/20);
        r.offset(x, y);
        canvas->drawRect(r, p);
    }

    void drawClippedGeom(SkCanvas* canvas, const SkPoint& offset, bool useAA) {

        int count = canvas->save();

        switch (fGeom) {
        case kRect_Geometry:
            canvas->clipRect(create_rect(offset), SkRegion::kReplace_Op, useAA);
            break;
        case kRRect_Geometry:
            canvas->clipRRect(create_rrect(offset), SkRegion::kReplace_Op, useAA);
            break;
        case kCircle_Geometry:
            canvas->clipRRect(create_circle(offset), SkRegion::kReplace_Op, useAA);
            break;
        case kConvexPath_Geometry:
            canvas->clipPath(create_convex_path(offset), SkRegion::kReplace_Op, useAA);
            break;
        case kConcavePath_Geometry:
            canvas->clipPath(create_concave_path(offset), SkRegion::kReplace_Op, useAA);
            break;
        case kRectAndRect_Geometry: {
            SkRect r = create_rect(offset);
            r.offset(fSign * kXlate, fSign * kXlate);
            canvas->clipRect(r, SkRegion::kReplace_Op, true); // AA here forces shader clips
            canvas->clipRect(create_rect(offset), SkRegion::kIntersect_Op, useAA);
            } break;
        case kRectAndRRect_Geometry: {
            SkRect r = create_rect(offset);
            r.offset(fSign * kXlate, fSign * kXlate);
            canvas->clipRect(r, SkRegion::kReplace_Op, true); // AA here forces shader clips
            canvas->clipRRect(create_rrect(offset), SkRegion::kIntersect_Op, useAA);
            } break;
        case kRectAndConvex_Geometry: {
            SkRect r = create_rect(offset);
            r.offset(fSign * kXlate, fSign * kXlate);
            canvas->clipRect(r, SkRegion::kReplace_Op, true); // AA here forces shader clips
            canvas->clipPath(create_convex_path(offset), SkRegion::kIntersect_Op, useAA);
            } break;
        case kRectAndConcave_Geometry: {
            SkRect r = create_rect(offset);
            r.offset(fSign * kXlate, fSign * kXlate);
            canvas->clipRect(r, SkRegion::kReplace_Op, true); // AA here forces shader clips
            canvas->clipPath(create_concave_path(offset), SkRegion::kIntersect_Op, useAA);
            } break;
        } 

        SkISize size = canvas->getDeviceSize();
        SkRect bigR = SkRect::MakeWH(SkIntToScalar(size.width()), SkIntToScalar(size.height()));

        SkPaint p;
        p.setColor(SK_ColorRED);

        canvas->drawRect(bigR, p);
        canvas->restoreToCount(count);
    }

    void drawMask(SkCanvas* canvas, const SkRect& r) {
        SkPaint paint;
        paint.setAntiAlias(true);

        if (true) {
            SkBitmap mask;
            int w = SkScalarRound(r.width());
            int h = SkScalarRound(r.height());
            mask.setConfig(SkBitmap::kARGB_8888_Config, w, h);
            mask.allocPixels();
            mask.eraseColor(0);
            SkCanvas c(mask);
            SkRect bounds = r;
            bounds.offset(-bounds.fLeft, -bounds.fTop);
            c.drawOval(bounds, paint);
            
            paint.setXfermodeMode(SkXfermode::kDstIn_Mode);
            canvas->drawBitmap(mask, r.fLeft, r.fTop, &paint);
        } else {
            SkPath p;
            p.addOval(r);
            p.setFillType(SkPath::kInverseWinding_FillType);
            paint.setXfermodeMode(SkXfermode::kDstOut_Mode);
            canvas->drawPath(p, paint);
        }
    }

    static std::unique_ptr<GrLegacyMeshDrawOp> Make(GrColor color, const SkMatrix& viewMatrix,
                                                    const SkRect& rect, const SkStrokeRec& stroke,
                                                    bool snapToPixelCenters) {
        if (!allowed_stroke(stroke)) {
            return nullptr;
        }
        NonAAStrokeRectOp* op = new NonAAStrokeRectOp();
        op->fColor = color;
        op->fViewMatrix = viewMatrix;
        op->fRect = rect;
        // Sort the rect for hairlines
        op->fRect.sort();
        op->fStrokeWidth = stroke.getWidth();

        SkScalar rad = SkScalarHalf(op->fStrokeWidth);
        SkRect bounds = rect;
        bounds.outset(rad, rad);

        // If our caller snaps to pixel centers then we have to round out the bounds
        if (snapToPixelCenters) {
            viewMatrix.mapRect(&bounds);
            // We want to be consistent with how we snap non-aa lines. To match what we do in
            // GrGLSLVertexShaderBuilder, we first floor all the vertex values and then add half a
            // pixel to force us to pixel centers.
            bounds.set(SkScalarFloorToScalar(bounds.fLeft),
                       SkScalarFloorToScalar(bounds.fTop),
                       SkScalarFloorToScalar(bounds.fRight),
                       SkScalarFloorToScalar(bounds.fBottom));
            bounds.offset(0.5f, 0.5f);
            op->setBounds(bounds, HasAABloat::kNo, IsZeroArea::kNo);
        } else {
            op->setTransformedBounds(bounds, op->fViewMatrix, HasAABloat::kNo, IsZeroArea::kNo);
        }
        return std::unique_ptr<GrLegacyMeshDrawOp>(op);
    }

SkRect LayerAndroid::subtractLayers(const SkRect& visibleRect) const
{
    SkRect result;
    if (m_recordingPicture) {
        SkRect globalRect = bounds();
        globalRect.offset(-getPosition()); // localToGlobal adds in position
        SkMatrix globalMatrix;
        localToGlobal(&globalMatrix);
        globalMatrix.mapRect(&globalRect);
        SkIRect roundedGlobal;
        globalRect.round(&roundedGlobal);
        SkIRect iVisibleRect;
        visibleRect.round(&iVisibleRect);
        SkRegion visRegion(iVisibleRect);
        visRegion.op(roundedGlobal, SkRegion::kDifference_Op);
        result.set(visRegion.getBounds());
#if DEBUG_NAV_UI
        SkDebugf("%s visibleRect=(%g,%g,r=%g,b=%g) globalRect=(%g,%g,r=%g,b=%g)"
            "result=(%g,%g,r=%g,b=%g)", __FUNCTION__,
            visibleRect.fLeft, visibleRect.fTop,
            visibleRect.fRight, visibleRect.fBottom,
            globalRect.fLeft, globalRect.fTop,
            globalRect.fRight, globalRect.fBottom,
            result.fLeft, result.fTop, result.fRight, result.fBottom);
#endif
    } else
        result = visibleRect;
    for (int i = 0; i < countChildren(); i++)
        result = getChild(i)->subtractLayers(result);
    return result;
}

    void onOnceBeforeDraw() override {
        SkRandom    rand;
        int         steps = 20;
        SkScalar    dist = SkIntToScalar(400);
        SkScalar    x = SkIntToScalar(20);
        SkScalar    y = SkIntToScalar(50);

        fPath.moveTo(x, y);
        for (int i = 0; i < steps; i++) {
            x += dist/steps;
            SkScalar tmpY = y + SkIntToScalar(rand.nextS() % 25);
            if (i == steps/2) {
                fPath.moveTo(x, tmpY);
            } else {
                fPath.lineTo(x, tmpY);
            }
        }

        {
            SkRect  oval;
            oval.set(SkIntToScalar(20), SkIntToScalar(30),
                     SkIntToScalar(100), SkIntToScalar(60));
            oval.offset(x, 0);
            fPath.addRoundRect(oval, SkIntToScalar(8), SkIntToScalar(8));
        }

        fClickPt.set(SkIntToScalar(200), SkIntToScalar(200));

        this->setBGColor(0xFFDDDDDD);
    }

    void onDraw(int loops, SkCanvas* canvas) override {
        SkPaint paint;
        this->setupPaint(&paint);

        paint.setAntiAlias(true);

        SkRandom rand;
        for (int i = 0; i < loops; i++) {
            SkRect r = SkRect::MakeWH(rand.nextUScalar1() * 400,
                                      rand.nextUScalar1() * 400);
            r.offset(fRadius, fRadius);

            if (fRadius > 0) {
                sk_sp<SkImageFilter> mf;
                switch (fStyle) {
                case kDilate_MT:
                    mf = SkDilateImageFilter::Make(SkScalarFloorToInt(fRadius),
                                                   SkScalarFloorToInt(fRadius),
                                                   nullptr);
                    break;
                case kErode_MT:
                    mf = SkErodeImageFilter::Make(SkScalarFloorToInt(fRadius),
                                                  SkScalarFloorToInt(fRadius),
                                                  nullptr);
                    break;
                }
                paint.setImageFilter(std::move(mf));
            }
            canvas->drawOval(r, paint);
        }
    }

void SampleWindow::onSizeChange() {
    this->INHERITED::onSizeChange();

    SkView::F2BIter iter(this);
    SkView* view = iter.next();
    view->setSize(this->width(), this->height());

    // rebuild our clippath
    {
        const SkScalar W = this->width();
        const SkScalar H = this->height();

        fClipPath.reset();
#if 0
        for (SkScalar y = SK_Scalar1; y < H; y += SkIntToScalar(32)) {
            SkRect r;
            r.set(SK_Scalar1, y, SkIntToScalar(30), y + SkIntToScalar(30));
            for (; r.fLeft < W; r.offset(SkIntToScalar(32), 0))
                fClipPath.addRect(r);
        }
#else
        SkRect r;
        r.set(0, 0, W, H);
        fClipPath.addRect(r, SkPath::kCCW_Direction);
        r.set(W/4, H/4, W*3/4, H*3/4);
        fClipPath.addRect(r, SkPath::kCW_Direction);
#endif
    }

    this->updateTitle();    // to refresh our config
}

void SKPBench::onPerCanvasPreDraw(SkCanvas* canvas) {
    if (!fUseMultiPictureDraw) {
        return;
    }

    SkIRect bounds;
    SkAssertResult(canvas->getClipDeviceBounds(&bounds));

    int xTiles = SkScalarCeilToInt(bounds.width()  / SkIntToScalar(FLAGS_benchTile));
    int yTiles = SkScalarCeilToInt(bounds.height() / SkIntToScalar(FLAGS_benchTile));

    fSurfaces.setReserve(xTiles * yTiles);
    fTileRects.setReserve(xTiles * yTiles);

    SkImageInfo ii = canvas->imageInfo().makeWH(FLAGS_benchTile, FLAGS_benchTile);

    for (int y = bounds.fTop; y < bounds.fBottom; y += FLAGS_benchTile) {
        for (int x = bounds.fLeft; x < bounds.fRight; x += FLAGS_benchTile) {
            const SkIRect tileRect = SkIRect::MakeXYWH(x, y, FLAGS_benchTile, FLAGS_benchTile);
            *fTileRects.append() = tileRect;
            *fSurfaces.push() = canvas->newSurface(ii);

            // Never want the contents of a tile to include stuff the parent
            // canvas clips out
            SkRect clip = SkRect::Make(bounds);
            clip.offset(-SkIntToScalar(tileRect.fLeft), -SkIntToScalar(tileRect.fTop));
            fSurfaces.top()->getCanvas()->clipRect(clip);

            fSurfaces.top()->getCanvas()->setMatrix(canvas->getTotalMatrix());
            fSurfaces.top()->getCanvas()->scale(fScale, fScale);
        }
    }
}

    void drawMask(SkCanvas* canvas, const SkRect& r) {
        SkPaint paint;
        paint.setAntiAlias(true);

        if (true) {
            SkBitmap mask;
            int w = SkScalarRoundToInt(r.width());
            int h = SkScalarRoundToInt(r.height());
            mask.allocN32Pixels(w, h);
            mask.eraseColor(SK_ColorTRANSPARENT);
            SkCanvas c(mask);
            SkRect bounds = r;
            bounds.offset(-bounds.fLeft, -bounds.fTop);
            c.drawOval(bounds, paint);

            paint.setBlendMode(SkBlendMode::kDstIn);
            canvas->drawBitmap(mask, r.fLeft, r.fTop, &paint);
        } else {
            SkPath p;
            p.addOval(r);
            p.setFillType(SkPath::kInverseWinding_FillType);
            paint.setBlendMode(SkBlendMode::kDstOut);
            canvas->drawPath(p, paint);
        }
    }

static void add_rect_to_clip(const GrClip& clip, const SkRect& devRect, GrClip* out) {
    switch (clip.clipType()) {
        case GrClip::kClipStack_ClipType: {
            SkClipStack* stack = new SkClipStack;
            *stack = *clip.clipStack();
            // The stack is actually in clip space not device space.
            SkRect clipRect = devRect;
            SkPoint origin = { SkIntToScalar(clip.origin().fX), SkIntToScalar(clip.origin().fY) };
            clipRect.offset(origin);
            SkIRect iclipRect;
            clipRect.roundOut(&iclipRect);
            clipRect = SkRect::Make(iclipRect);
            stack->clipDevRect(clipRect, SkRegion::kIntersect_Op, false);
            out->setClipStack(stack, &clip.origin());
            break;
        }
        case GrClip::kWideOpen_ClipType:
            *out = GrClip(devRect);
            break;
        case GrClip::kIRect_ClipType: {
            SkIRect intersect;
            devRect.roundOut(&intersect);
            if (intersect.intersect(clip.irect())) {
                *out = GrClip(intersect);
            } else {
                *out = clip;
            }
            break;
        }
    }
}