C++ SkPath::getBounds方法代码示例

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);
}

// 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]);
        }
    }
}

static void test_path_bounds(skiatest::Reporter* reporter) {
    SkPath path;
    SkAAClip clip;
    const int height = 40;
    const SkScalar sheight = SkIntToScalar(height);

    path.addOval(SkRect::MakeWH(sheight, sheight));
    REPORTER_ASSERT(reporter, sheight == path.getBounds().height());
    clip.setPath(path, nullptr, true);
    REPORTER_ASSERT(reporter, height == clip.getBounds().height());

    // this is the trimmed height of this cubic (with aa). The critical thing
    // for this test is that it is less than height, which represents just
    // the bounds of the path's control-points.
    //
    // This used to fail until we tracked the MinY in the BuilderBlitter.
    //
    const int teardrop_height = 12;
    path.reset();
    imoveTo(path, 0, 20);
    icubicTo(path, 40, 40, 40, 0, 0, 20);
    REPORTER_ASSERT(reporter, sheight == path.getBounds().height());
    clip.setPath(path, nullptr, true);
    REPORTER_ASSERT(reporter, teardrop_height == clip.getBounds().height());
}

 TessellatingPathBatch(const GrColor& color,
                       const SkPath& path,
                       const GrStrokeInfo& stroke,
                       const SkMatrix& viewMatrix,
                       const SkRect& clipBounds)
   : INHERITED(ClassID())
   , fColor(color)
   , fPath(path)
   , fStroke(stroke)
   , fViewMatrix(viewMatrix) {
     const SkRect& pathBounds = path.getBounds();
     fClipBounds = clipBounds;
     // Because the clip bounds are used to add a contour for inverse fills, they must also
     // include the path bounds.
     fClipBounds.join(pathBounds);
     if (path.isInverseFillType()) {
         fBounds = fClipBounds;
     } else {
         fBounds = path.getBounds();
     }
     if (!stroke.isFillStyle()) {
         SkScalar radius = SkScalarHalf(stroke.getWidth());
         if (stroke.getJoin() == SkPaint::kMiter_Join) {
             SkScalar scale = stroke.getMiter();
             if (scale > SK_Scalar1) {
                 radius = SkScalarMul(radius, scale);
             }
         }
         fBounds.outset(radius, radius);
     }
     viewMatrix.mapRect(&fBounds);
 }

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 void check_convex_bounds(skiatest::Reporter* reporter, const SkPath& p,
                                const SkRect& bounds) {
    REPORTER_ASSERT(reporter, p.isConvex());
    REPORTER_ASSERT(reporter, p.getBounds() == bounds);

    SkPath p2(p);
    REPORTER_ASSERT(reporter, p2.isConvex());
    REPORTER_ASSERT(reporter, p2.getBounds() == bounds);

    SkPath other;
    other.swap(p2);
    REPORTER_ASSERT(reporter, other.isConvex());
    REPORTER_ASSERT(reporter, other.getBounds() == bounds);
}

static void test_maskFromPath(const SkPath& path) {
    SkIRect bounds;
    path.getBounds().roundOut(&bounds);

    SkPaint paint;
    paint.setAntiAlias(true);

    SkAutoTUnref<SkCanvas> path_canvas(MakeCanvas(bounds));
    path_canvas->drawPath(path, paint);

    SkAutoTUnref<SkCanvas> rect_canvas(MakeCanvas(bounds));
    drawRectAsPath(rect_canvas, path.getBounds(), paint);

    compare_canvas(path_canvas, rect_canvas);
}

static void test_cubic2() {
    const char* str = "M2242 -590088L-377758 9.94099e+07L-377758 9.94099e+07L2242 -590088Z";
    SkPath path;
    SkParsePath::FromSVGString(str, &path);

    {
#ifdef SK_BUILD_FOR_WIN
        // windows doesn't have strtof
        float x = (float)strtod("9.94099e+07", NULL);
#else
        float x = strtof("9.94099e+07", NULL);
#endif
        int ix = (int)x;
        int fx = (int)(x * 65536);
        int ffx = SkScalarToFixed(x);
        printf("%g %x %x %x\n", x, ix, fx, ffx);

        SkRect r = path.getBounds();
        SkIRect ir;
        r.round(&ir);
        printf("[%g %g %g %g] [%x %x %x %x]\n",
               SkScalarToDouble(r.fLeft), SkScalarToDouble(r.fTop),
               SkScalarToDouble(r.fRight), SkScalarToDouble(r.fBottom),
               ir.fLeft, ir.fTop, ir.fRight, ir.fBottom);
    }

    SkBitmap bitmap;
    bitmap.setConfig(SkBitmap::kARGB_8888_Config, 300, 200);
    bitmap.allocPixels();

    SkCanvas canvas(bitmap);
    SkPaint paint;
    paint.setAntiAlias(true);
    canvas.drawPath(path, paint);
}

bool GrAAConvexPathRenderer::onDrawPath(GrDrawTarget* target,
                                        GrPipelineBuilder* pipelineBuilder,
                                        GrColor color,
                                        const SkMatrix& vm,
                                        const SkPath& path,
                                        const GrStrokeInfo&,
                                        bool antiAlias) {
    if (path.isEmpty()) {
        return true;
    }

    // We outset our vertices one pixel and add one more pixel for precision.
    // TODO create tighter bounds when we start reordering.
    SkRect devRect = path.getBounds();
    vm.mapRect(&devRect);
    devRect.outset(2, 2);

    AAConvexPathBatch::Geometry geometry;
    geometry.fColor = color;
    geometry.fViewMatrix = vm;
    geometry.fPath = path;

    SkAutoTUnref<GrBatch> batch(AAConvexPathBatch::Create(geometry));
    target->drawBatch(pipelineBuilder, batch, &devRect);

    return true;

}

void SkGScalerContext::generateMetrics(SkGlyph* glyph) {
    fProxy->getMetrics(glyph);

    SkVector advance;
    fMatrix.mapXY(SkFloatToScalar(glyph->fAdvanceX),
                  SkFloatToScalar(glyph->fAdvanceY), &advance);
    glyph->fAdvanceX = SkScalarToFloat(advance.fX);
    glyph->fAdvanceY = SkScalarToFloat(advance.fY);

    SkPath path;
    fProxy->getPath(*glyph, &path);
    path.transform(fMatrix);

    SkRect storage;
    const SkPaint& paint = fFace->paint();
    const SkRect& newBounds = paint.doComputeFastBounds(path.getBounds(),
                                                        &storage,
                                                        SkPaint::kFill_Style);
    SkIRect ibounds;
    newBounds.roundOut(&ibounds);
    glyph->fLeft = ibounds.fLeft;
    glyph->fTop = ibounds.fTop;
    glyph->fWidth = ibounds.width();
    glyph->fHeight = ibounds.height();
    glyph->fMaskFormat = SkMask::kARGB32_Format;
}

 DEFINE_BATCH_CLASS_ID
 AAConvexPathBatch(GrColor color, const SkMatrix& viewMatrix, const SkPath& path)
     : INHERITED(ClassID()) {
     fGeoData.emplace_back(Geometry{color, viewMatrix, path});
     this->setTransformedBounds(path.getBounds(), viewMatrix, HasAABloat::kYes,
                                IsZeroArea::kNo);
 }

bool
PathSkia::StrokeContainsPoint(const StrokeOptions &aStrokeOptions,
                              const Point &aPoint,
                              const Matrix &aTransform) const
{
  Matrix inverse = aTransform;
  inverse.Invert();
  Point transformed = inverse * aPoint;

  SkPaint paint;
  StrokeOptionsToPaint(paint, aStrokeOptions);

  SkPath strokePath;
  paint.getFillPath(mPath, &strokePath);

  Rect bounds = aTransform.TransformBounds(SkRectToRect(strokePath.getBounds()));

  if (aPoint.x < bounds.x || aPoint.y < bounds.y ||
      aPoint.x > bounds.XMost() || aPoint.y > bounds.YMost()) {
    return false;
  }

  SkRegion pointRect;
  pointRect.setRect(int32_t(SkFloatToScalar(transformed.x - 1.f)),
                    int32_t(SkFloatToScalar(transformed.y - 1.f)),
                    int32_t(SkFloatToScalar(transformed.x + 1.f)),
                    int32_t(SkFloatToScalar(transformed.y + 1.f)));

  SkRegion pathRegion;
  
  return pathRegion.setPath(strokePath, pointRect);
}

GrGLPath::GrGLPath(GrGpuGL* gpu, const SkPath& path) : INHERITED(gpu, kIsWrapped) {
#ifndef SK_SCALAR_IS_FLOAT
    GrCrash("Assumes scalar is float.");
#endif
    SkASSERT(!path.isEmpty());

    GL_CALL_RET(fPathID, GenPaths(1));

    SkSTArray<16, GrGLubyte, true> pathCommands;
    SkSTArray<16, SkPoint, true> pathPoints;

    int verbCnt = path.countVerbs();
    int pointCnt = path.countPoints();
    pathCommands.resize_back(verbCnt);
    pathPoints.resize_back(pointCnt);

    // TODO: Direct access to path points since we could pass them on directly.
    path.getPoints(&pathPoints[0], pointCnt);
    path.getVerbs(&pathCommands[0], verbCnt);

    GR_DEBUGCODE(int numPts = 0);
    for (int i = 0; i < verbCnt; ++i) {
        SkPath::Verb v = static_cast<SkPath::Verb>(pathCommands[i]);
        pathCommands[i] = verb_to_gl_path_cmd(v);
        GR_DEBUGCODE(numPts += num_pts(v));
    }
    GrAssert(pathPoints.count() == numPts);

    GL_CALL(PathCommands(fPathID,
                         verbCnt, &pathCommands[0],
                         2 * pointCnt, GR_GL_FLOAT, &pathPoints[0]));
    fBounds = path.getBounds();
}

bool SkRasterClip::op(const SkPath& path, const SkMatrix& matrix, const SkIRect& bounds,
                      SkRegion::Op op, bool doAA) {
    AUTO_RASTERCLIP_VALIDATE(*this);

    if (fForceConservativeRects) {
        SkIRect ir;
        switch (mutate_conservative_op(&op, path.isInverseFillType())) {
            case kDoNothing_MutateResult:
                return !this->isEmpty();
            case kReplaceClippedAgainstGlobalBounds_MutateResult:
                ir = bounds;
                break;
            case kContinue_MutateResult: {
                SkRect bounds = path.getBounds();
                matrix.mapRect(&bounds);
                ir = bounds.roundOut();
                break;
            }
        }
        return this->op(ir, op);
    }

    // base is used to limit the size (and therefore memory allocation) of the
    // region that results from scan converting devPath.
    SkRegion base;

    SkPath devPath;
    if (matrix.isIdentity()) {
        devPath = path;
    } else {
        path.transform(matrix, &devPath);
        devPath.setIsVolatile(true);
    }
    if (SkRegion::kIntersect_Op == op) {
        // since we are intersect, we can do better (tighter) with currRgn's
        // bounds, than just using the device. However, if currRgn is complex,
        // our region blitter may hork, so we do that case in two steps.
        if (this->isRect()) {
            // FIXME: we should also be able to do this when this->isBW(),
            // but relaxing the test above triggers GM asserts in
            // SkRgnBuilder::blitH(). We need to investigate what's going on.
            return this->setPath(devPath, this->bwRgn(), doAA);
        } else {
            base.setRect(this->getBounds());
            SkRasterClip clip(fForceConservativeRects);
            clip.setPath(devPath, base, doAA);
            return this->op(clip, op);
        }
    } else {
        base.setRect(bounds);

        if (SkRegion::kReplace_Op == op) {
            return this->setPath(devPath, base, doAA);
        } else {
            SkRasterClip clip(fForceConservativeRects);
            clip.setPath(devPath, base, doAA);
            return this->op(clip, op);
        }
    }
}

    void onDraw(const int loops, SkCanvas* canvas) override {
        SkPaint paint;
        paint.setAntiAlias(true);
        paint.setStyle(SkPaint::kStroke_Style);
        paint.setStrokeWidth(2);
        if (fRound) {
            paint.setStrokeJoin(SkPaint::kRound_Join);
        }
        this->setupPaint(&paint);

        const SkRect r = fPath.getBounds();
        switch (fAlign) {
            case kLeft_Align:
                canvas->translate(-r.left(), 0);
                break;
            case kMiddle_Align:
                break;
            case kRight_Align:
                canvas->translate(640 - r.right(), 0);
                break;
        }

        for (int i = 0; i < loops; i++) {
            canvas->drawPath(fPath, paint);
        }
    }