C++ SkCanvas::clipPath方法代码示例

    void onDraw(SkCanvas* canvas) override {
        SkPictureRecorder recorder;
        SkCanvas* rec = recorder.beginRecording(1200, 900, nullptr, 0);
        SkPath p;
        SkRect r = {
            SkIntToScalar(100),
            SkIntToScalar(200),
            SkIntToScalar(400),
            SkIntToScalar(700)
        };
        p.addRoundRect(r, SkIntToScalar(50), SkIntToScalar(50));
        rec->clipPath(p, SkRegion::kIntersect_Op, true);
        rec->translate(SkIntToScalar(250), SkIntToScalar(250));
        rec->clipPath(p, SkRegion::kIntersect_Op, true);
        rec->drawColor(0xffff0000);
        sk_sp<SkPicture> pict(recorder.finishRecordingAsPicture());

        canvas->setAllowSimplifyClip(true);
        canvas->save();
        canvas->drawPicture(pict);
        canvas->restore();

        canvas->setAllowSimplifyClip(false);
        canvas->save();
        canvas->translate(SkIntToScalar(1200 / 2), 0);
        canvas->drawPicture(pict);
        canvas->restore();
    }

    virtual void onDraw(SkCanvas* canvas) {
        constexpr SkScalar kOffset = 35000.0f;
        constexpr SkScalar kExtents = 1000.0f;

        SkPictureRecorder recorder;
        // We record a picture of huge vertical extents in which we clear the canvas to red, create
        // a 'extents' by 'extents' round rect clip at a vertical offset of 'offset', then draw
        // green into that.
        SkCanvas* rec = recorder.beginRecording(kExtents, kOffset + kExtents, nullptr, 0);
        rec->drawColor(SK_ColorRED);
        rec->save();
        SkRect r = SkRect::MakeXYWH(-kExtents, kOffset - kExtents, 2 * kExtents, 2 * kExtents);
        SkPath p;
        p.addRoundRect(r, 5, 5);
        rec->clipPath(p, true);
        rec->drawColor(SK_ColorGREEN);
        rec->restore();
        sk_sp<SkPicture> pict(recorder.finishRecordingAsPicture());

        // Next we play that picture into another picture of the same size.
        pict->playback(recorder.beginRecording(pict->cullRect().width(),
                                               pict->cullRect().height(),
                                               nullptr, 0));
        sk_sp<SkPicture> pict2(recorder.finishRecordingAsPicture());

        // Finally we play the part of that second picture that should be green into the canvas.
        canvas->save();
        canvas->translate(kExtents / 2, -(kOffset - kExtents / 2));
        pict2->playback(canvas);
        canvas->restore();

        // If the image is red, we erroneously decided the clipPath was empty and didn't record
        // the green drawColor, if it's green we're all good.
    }

static void fuzz_drawPath(Fuzz* fuzz) {
    SkPaint p;
    init_paint(fuzz, &p);
    sk_sp<SkSurface> surface;
    init_surface(fuzz, &surface);

    // TODO(kjlubick): put the ability to fuzz a path in shared file, with
    // other common things (e.g. rects, lines)
    uint8_t i, j;
    fuzz->nextRange(&i, 0, 10); // set i to number of operations to perform
    SkPath path;
    SkScalar a, b, c, d, e, f;
    for (int k = 0; k < i; ++k) {
        fuzz->nextRange(&j, 0, 5); // set j to choose operation to perform
        switch (j) {
            case 0:
                fuzz->next(&a, &b);
                path.moveTo(a, b);
                break;
            case 1:
                fuzz->next(&a, &b);
                path.lineTo(a, b);
                break;
            case 2:
                fuzz->next(&a, &b, &c, &d);
                path.quadTo(a, b, c, d);
                break;
            case 3:
                fuzz->next(&a, &b, &c, &d, &e);
                path.conicTo(a, b, c, d, e);
                break;
            case 4:
                fuzz->next(&a, &b, &c, &d, &e, &f);
                path.cubicTo(a, b, c, d, e, f);
                break;
            case 5:
                fuzz->next(&a, &b, &c, &d, &e);
                path.arcTo(a, b, c, d, e);
                break;
        }
    }
    path.close();

    SkCanvas* cnv = surface->getCanvas();
    cnv->drawPath(path, p);

    bool bl;
    fuzz->next(&bl);
    cnv->clipPath(path, kIntersect_SkClipOp, bl);
}

    virtual void onDraw(SkCanvas* canvas) {
        int offset = 35000;
        int extents = 1000;

        // We record a picture of huge vertical extents in which we clear the canvas to red, create
        // a 'extents' by 'extents' round rect clip at a vertical offset of 'offset', then draw
        // green into that.
        SkPicture pict;
        SkCanvas* rec = pict.beginRecording(100, offset + extents);
        rec->drawColor(0xffff0000);
        rec->save();
        SkRect r = {
            SkIntToScalar(-extents),
            SkIntToScalar(offset - extents),
            SkIntToScalar(extents),
            SkIntToScalar(offset + extents)
        };
        SkPath p;
        p.addRoundRect(r, 5, 5);
        rec->clipPath(p, SkRegion::kIntersect_Op, true);
        rec->drawColor(0xff00ff00);
        rec->restore();
        pict.endRecording();

        // Next we play that picture into another picture of the same size.
        SkPicture pict2;
        pict.draw(pict2.beginRecording(100, offset + extents));
        pict2.endRecording();

        // Finally we play the part of that second picture that should be green into the canvas.
        canvas->save();
        canvas->translate(SkIntToScalar(extents / 2),
                          SkIntToScalar(-(offset - extents / 2)));
        pict2.draw(canvas);
        canvas->restore();

        // If the image is red, we erroneously decided the clipPath was empty and didn't record
        // the green drawColor, if it's green we're all good.
    }

static void
_prepare_sized_pattern(mbe_t *mbe, mbe_pattern_t *ptn) {
    SkCanvas *canvas = mbe->canvas;
    SkPath path;
    co_aix x, y;
    co_aix reverse[6];

    *mbe->saved_region = canvas->getTotalClip();

    compute_reverse(ptn->matrix, reverse);
    x = 0; y = 0;
    matrix_trans_pos(reverse, &x, &y);
    path.moveTo(CO_AIX_2_SKSCALAR(x), CO_AIX_2_SKSCALAR(y));
    x = 0; y = ptn->h;
    matrix_trans_pos(reverse, &x, &y);
    path.moveTo(CO_AIX_2_SKSCALAR(x), CO_AIX_2_SKSCALAR(y));
    x = ptn->w; y = ptn->h;
    matrix_trans_pos(reverse, &x, &y);
    path.moveTo(CO_AIX_2_SKSCALAR(x), CO_AIX_2_SKSCALAR(y));
    path.close();

    canvas->clipPath(path, SkRegion::kIntersect_Op);
}

static void test_clip_bound_opt(skiatest::Reporter* reporter) {
    // Test for crbug.com/229011
    SkRect rect1 = SkRect::MakeXYWH(SkIntToScalar(4), SkIntToScalar(4),
                                    SkIntToScalar(2), SkIntToScalar(2));
    SkRect rect2 = SkRect::MakeXYWH(SkIntToScalar(7), SkIntToScalar(7),
                                    SkIntToScalar(1), SkIntToScalar(1));
    SkRect rect3 = SkRect::MakeXYWH(SkIntToScalar(6), SkIntToScalar(6),
                                    SkIntToScalar(1), SkIntToScalar(1));

    SkPath invPath;
    invPath.addOval(rect1);
    invPath.setFillType(SkPath::kInverseEvenOdd_FillType);
    SkPath path;
    path.addOval(rect2);
    SkPath path2;
    path2.addOval(rect3);
    SkIRect clipBounds;
    SkPictureRecorder recorder;

    // Testing conservative-raster-clip that is enabled by PictureRecord
    {
        SkCanvas* canvas = recorder.beginRecording(10, 10);
        canvas->clipPath(invPath, SkRegion::kIntersect_Op);
        bool nonEmpty = canvas->getClipDeviceBounds(&clipBounds);
        REPORTER_ASSERT(reporter, true == nonEmpty);
        REPORTER_ASSERT(reporter, 0 == clipBounds.fLeft);
        REPORTER_ASSERT(reporter, 0 == clipBounds.fTop);
        REPORTER_ASSERT(reporter, 10 == clipBounds.fBottom);
        REPORTER_ASSERT(reporter, 10 == clipBounds.fRight);
    }
    {
        SkCanvas* canvas = recorder.beginRecording(10, 10);
        canvas->clipPath(path, SkRegion::kIntersect_Op);
        canvas->clipPath(invPath, SkRegion::kIntersect_Op);
        bool nonEmpty = canvas->getClipDeviceBounds(&clipBounds);
        REPORTER_ASSERT(reporter, true == nonEmpty);
        REPORTER_ASSERT(reporter, 7 == clipBounds.fLeft);
        REPORTER_ASSERT(reporter, 7 == clipBounds.fTop);
        REPORTER_ASSERT(reporter, 8 == clipBounds.fBottom);
        REPORTER_ASSERT(reporter, 8 == clipBounds.fRight);
    }
    {
        SkCanvas* canvas = recorder.beginRecording(10, 10);
        canvas->clipPath(path, SkRegion::kIntersect_Op);
        canvas->clipPath(invPath, SkRegion::kUnion_Op);
        bool nonEmpty = canvas->getClipDeviceBounds(&clipBounds);
        REPORTER_ASSERT(reporter, true == nonEmpty);
        REPORTER_ASSERT(reporter, 0 == clipBounds.fLeft);
        REPORTER_ASSERT(reporter, 0 == clipBounds.fTop);
        REPORTER_ASSERT(reporter, 10 == clipBounds.fBottom);
        REPORTER_ASSERT(reporter, 10 == clipBounds.fRight);
    }
    {
        SkCanvas* canvas = recorder.beginRecording(10, 10);
        canvas->clipPath(path, SkRegion::kDifference_Op);
        bool nonEmpty = canvas->getClipDeviceBounds(&clipBounds);
        REPORTER_ASSERT(reporter, true == nonEmpty);
        REPORTER_ASSERT(reporter, 0 == clipBounds.fLeft);
        REPORTER_ASSERT(reporter, 0 == clipBounds.fTop);
        REPORTER_ASSERT(reporter, 10 == clipBounds.fBottom);
        REPORTER_ASSERT(reporter, 10 == clipBounds.fRight);
    }
    {
        SkCanvas* canvas = recorder.beginRecording(10, 10);
        canvas->clipPath(path, SkRegion::kReverseDifference_Op);
        bool nonEmpty = canvas->getClipDeviceBounds(&clipBounds);
        // True clip is actually empty in this case, but the best
        // determination we can make using only bounds as input is that the
        // clip is included in the bounds of 'path'.
        REPORTER_ASSERT(reporter, true == nonEmpty);
        REPORTER_ASSERT(reporter, 7 == clipBounds.fLeft);
        REPORTER_ASSERT(reporter, 7 == clipBounds.fTop);
        REPORTER_ASSERT(reporter, 8 == clipBounds.fBottom);
        REPORTER_ASSERT(reporter, 8 == clipBounds.fRight);
    }
    {
        SkCanvas* canvas = recorder.beginRecording(10, 10);
        canvas->clipPath(path, SkRegion::kIntersect_Op);
        canvas->clipPath(path2, SkRegion::kXOR_Op);
        bool nonEmpty = canvas->getClipDeviceBounds(&clipBounds);
        REPORTER_ASSERT(reporter, true == nonEmpty);
        REPORTER_ASSERT(reporter, 6 == clipBounds.fLeft);
        REPORTER_ASSERT(reporter, 6 == clipBounds.fTop);
        REPORTER_ASSERT(reporter, 8 == clipBounds.fBottom);
        REPORTER_ASSERT(reporter, 8 == clipBounds.fRight);
    }
}

//.........这里部分代码省略.........
        SkPaint paint;
        paint.setAntiAlias(true);
        for (int i = 0; i < 50; ++i) {
            canvas->drawPath(path, paint);
        }
    }
    picture = recorder.finishRecordingAsPicture();
    // A lot of large AA concave paths currently render an SkPicture undesireable for GPU rendering
    REPORTER_ASSERT(reporter, !SkPictureGpuAnalyzer(picture).suitableForGpuRasterization());

    canvas = recorder.beginRecording(100, 100);
    {
        SkPath path;

        path.moveTo(0, 0);
        path.lineTo(0, 50);
        path.lineTo(25, 25);
        path.lineTo(50, 50);
        path.lineTo(50, 0);
        path.close();
        REPORTER_ASSERT(reporter, !path.isConvex());

        SkPaint paint;
        paint.setAntiAlias(true);
        paint.setStyle(SkPaint::kStroke_Style);
        paint.setStrokeWidth(0);
        for (int i = 0; i < 50; ++i) {
            canvas->drawPath(path, paint);
        }
    }
    picture = recorder.finishRecordingAsPicture();
    // hairline stroked AA concave paths are fine for GPU rendering
    REPORTER_ASSERT(reporter, SkPictureGpuAnalyzer(picture).suitableForGpuRasterization());

    canvas = recorder.beginRecording(100, 100);
    {
        SkPaint paint;
        SkScalar intervals [] = { 10, 20 };
        paint.setPathEffect(SkDashPathEffect::Make(intervals, 2, 25));

        SkPoint points [2] = { { 0, 0 }, { 100, 0 } };

        for (int i = 0; i < 50; ++i) {
            canvas->drawPoints(SkCanvas::kLines_PointMode, 2, points, paint);
        }
    }
    picture = recorder.finishRecordingAsPicture();
    // fast-path dashed effects are fine for GPU rendering ...
    REPORTER_ASSERT(reporter, SkPictureGpuAnalyzer(picture).suitableForGpuRasterization());

    canvas = recorder.beginRecording(100, 100);
    {
        SkPaint paint;
        SkScalar intervals [] = { 10, 20 };
        paint.setPathEffect(SkDashPathEffect::Make(intervals, 2, 25));

        for (int i = 0; i < 50; ++i) {
            canvas->drawRect(SkRect::MakeWH(10, 10), paint);
        }
    }
    picture = recorder.finishRecordingAsPicture();
    // ... but only when applied to drawPoint() calls
    REPORTER_ASSERT(reporter, !SkPictureGpuAnalyzer(picture).suitableForGpuRasterization());

    canvas = recorder.beginRecording(100, 100);
    {
        const SkPath convexClip = make_convex_path();
        const SkPath concaveClip = make_concave_path();

        for (int i = 0; i < 50; ++i) {
            canvas->clipPath(convexClip);
            canvas->clipPath(concaveClip);
            canvas->clipPath(convexClip, SkRegion::kIntersect_Op, true);
            canvas->drawRect(SkRect::MakeWH(100, 100), SkPaint());
        }
    }
    picture = recorder.finishRecordingAsPicture();
    // Convex clips and non-AA concave clips are fine on the GPU.
    REPORTER_ASSERT(reporter, SkPictureGpuAnalyzer(picture).suitableForGpuRasterization());

    canvas = recorder.beginRecording(100, 100);
    {
        const SkPath concaveClip = make_concave_path();
        for (int i = 0; i < 50; ++i) {
            canvas->clipPath(concaveClip, SkRegion::kIntersect_Op, true);
            canvas->drawRect(SkRect::MakeWH(100, 100), SkPaint());
        }
    }
    picture = recorder.finishRecordingAsPicture();
    // ... but AA concave clips are not.
    REPORTER_ASSERT(reporter, !SkPictureGpuAnalyzer(picture).suitableForGpuRasterization());

    // Nest the previous picture inside a new one.
    canvas = recorder.beginRecording(100, 100);
    {
        canvas->drawPicture(picture);
    }
    picture = recorder.finishRecordingAsPicture();
    REPORTER_ASSERT(reporter, !SkPictureGpuAnalyzer(picture).suitableForGpuRasterization());
}