C++ SkRegion::setPath方法代码示例

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);
}

bool Sk2DPathEffect::filterPath(SkPath* dst, const SkPath& src, SkStrokeRec*) {
    if (!fMatrixIsInvertible) {
        return false;
    }

    SkPath  tmp;
    SkIRect ir;

    src.transform(fInverse, &tmp);
    tmp.getBounds().round(&ir);
    if (!ir.isEmpty()) {
        this->begin(ir, dst);

        SkRegion rgn;
        rgn.setPath(tmp, SkRegion(ir));
        SkRegion::Iterator iter(rgn);
        for (; !iter.done(); iter.next()) {
            const SkIRect& rect = iter.rect();
            for (int y = rect.fTop; y < rect.fBottom; ++y) {
                this->nextSpan(rect.fLeft, y, rect.width(), dst);
            }
        }

        this->end(dst);
    }
    return true;
}

bool SkHitTestPath(const SkPath& path, SkRect& target, bool hires) {
    if (target.isEmpty()) {
        return false;
    }

    bool isInverse = path.isInverseFillType();
    if (path.isEmpty()) {
        return isInverse;
    }

    SkRect bounds = path.getBounds();

    bool sects = SkRect::Intersects(target, bounds);
    if (isInverse) {
        if (!sects) {
            return true;
        }
    } else {
        if (!sects) {
            return false;
        }
        if (target.contains(bounds)) {
            return true;
        }
    }

    SkPath devPath;
    const SkPath* pathPtr;
    SkRect        devTarget;

    if (hires) {
        const SkScalar coordLimit = SkIntToScalar(16384);
        const SkRect limit = { 0, 0, coordLimit, coordLimit };
        
        SkMatrix matrix;
        matrix.setRectToRect(bounds, limit, SkMatrix::kFill_ScaleToFit);

        path.transform(matrix, &devPath);
        matrix.mapRect(&devTarget, target);

        pathPtr = &devPath;
    } else {
        devTarget = target;
        pathPtr = &path;
    }

    SkIRect iTarget;
    devTarget.round(&iTarget);
    if (iTarget.isEmpty()) {
        iTarget.fLeft = SkScalarFloorToInt(devTarget.fLeft);
        iTarget.fTop = SkScalarFloorToInt(devTarget.fTop);
        iTarget.fRight = iTarget.fLeft + 1;
        iTarget.fBottom = iTarget.fTop + 1;
    }

    SkRegion clip(iTarget);
    SkRegion rgn;
    return rgn.setPath(*pathPtr, clip) ^ isInverse;
}

static jboolean Region_setPath(JNIEnv* env, jobject, jlong dstHandle,
                               jlong pathHandle, jlong clipHandle) {
    SkRegion*       dst  = reinterpret_cast<SkRegion*>(dstHandle);
    const SkPath*   path = reinterpret_cast<SkPath*>(pathHandle);
    const SkRegion* clip = reinterpret_cast<SkRegion*>(clipHandle);
    SkASSERT(dst && path && clip);
    bool result = dst->setPath(*path, *clip);
    return boolTojboolean(result);

}

static bool test_pathregion() {
    SkPath path;
    SkRegion region;
    path.moveTo(25071800.f, -141823808.f);
    path.lineTo(25075500.f, -141824000.f);
    path.lineTo(25075400.f, -141827712.f);
    path.lineTo(25071810.f, -141827600.f);
    path.close();

    SkIRect bounds;
    path.getBounds().round(&bounds);
    SkRegion clip(bounds);
    return region.setPath(path, clip); // <-- !! DOWN !!
}

bool SkPathContainsPoint(SkPath* originalPath, const FloatPoint& point, SkPath::FillType ft)
{
	SkRegion rgn;
	SkRegion clip;

	SkPath::FillType originalFillType = originalPath->getFillType();

	const SkPath* path = originalPath;
	SkPath scaledPath;
	int scale = 1;

	SkRect bounds = originalPath->getBounds();

	// We can immediately return false if the point is outside the bounding
	// rect.  We don't use bounds.contains() here, since it would exclude
	// points on the right and bottom edges of the bounding rect, and we want
	// to include them.
	SkScalar fX = SkFloatToScalar(point.x());
	SkScalar fY = SkFloatToScalar(point.y());
	if (fX < bounds.fLeft || fX > bounds.fRight || fY < bounds.fTop || fY > bounds.fBottom)
		return false;

	originalPath->setFillType(ft);

	// Skia has trouble with coordinates close to the max signed 16-bit values
	// If we have those, we need to scale. 
	//
	// TODO: remove this code once Skia is patched to work properly with large
	// values
	const SkScalar kMaxCoordinate = SkIntToScalar(1<<15);
	SkScalar biggestCoord = std::max(std::max(std::max(bounds.fRight, bounds.fBottom), -bounds.fLeft), -bounds.fTop);

	if (biggestCoord > kMaxCoordinate) {
		scale = SkScalarCeil(SkScalarDiv(biggestCoord, kMaxCoordinate));

		SkMatrix m;
		m.setScale(SkScalarInvert(SkIntToScalar(scale)), SkScalarInvert(SkIntToScalar(scale)));
		originalPath->transform(m, &scaledPath);
		path = &scaledPath;
	}

	int x = static_cast<int>(floorf(point.x() / scale));
	int y = static_cast<int>(floorf(point.y() / scale));
	clip.setRect(x - 1, y - 1, x + 1, y + 1);

	bool contains = rgn.setPath(*path, clip);

	originalPath->setFillType(originalFillType);
	return contains;
}

static void test_pathregion() {
    SkPath path;
    SkRegion region;
    path.moveTo(25071800.f, -141823808.f); 
    path.lineTo(25075500.f, -141824000.f);
    path.lineTo(25075400.f, -141827712.f);
    path.lineTo(25071810.f, -141827600.f);
    path.close();

    SkIRect bounds;
    path.getBounds().round(&bounds);
    SkRegion clip(bounds);
    bool result = region.setPath(path, clip); // <-- !! DOWN !!
    SkDebugf("----- result %d\n", result);
}

bool SkPathContainsPoint(const SkPath& originalPath, const FloatPoint& point, SkPath::FillType ft)
{
    SkRect bounds = originalPath.getBounds();

    // We can immediately return false if the point is outside the bounding
    // rect.  We don't use bounds.contains() here, since it would exclude
    // points on the right and bottom edges of the bounding rect, and we want
    // to include them.
    SkScalar fX = SkFloatToScalar(point.x());
    SkScalar fY = SkFloatToScalar(point.y());
    if (fX < bounds.fLeft || fX > bounds.fRight || fY < bounds.fTop || fY > bounds.fBottom)
        return false;

    // Scale the path to a large size before hit testing for two reasons:
    // 1) Skia has trouble with coordinates close to the max signed 16-bit values, so we scale larger paths down.
    //    TODO: when Skia is patched to work properly with large values, this will not be necessary.
    // 2) Skia does not support analytic hit testing, so we scale paths up to do raster hit testing with subpixel accuracy.
    // 3) Scale the x/y axis separately so an extreme large/small scale factor on one axis won't
    //    ruin the resolution of the other axis.
    SkScalar biggestCoordX = std::max(bounds.fRight, -bounds.fLeft);
    SkScalar biggestCoordY = std::max(bounds.fBottom, -bounds.fTop);
    if (SkScalarNearlyZero(biggestCoordX) || SkScalarNearlyZero(biggestCoordY))
        return false;

    biggestCoordX = std::max(biggestCoordX, std::fabs(fX) + 1);
    biggestCoordY = std::max(biggestCoordY, std::fabs(fY) + 1);

    const SkScalar kMaxCoordinate = SkIntToScalar(1 << 15);
    SkScalar scaleX = kMaxCoordinate / biggestCoordX;
    SkScalar scaleY = kMaxCoordinate / biggestCoordY;

    SkRegion rgn;
    SkRegion clip;
    SkMatrix m;
    SkPath scaledPath(originalPath);

    scaledPath.setFillType(ft);
    m.setScale(scaleX, scaleY);
    scaledPath.transform(m, 0);

    int x = static_cast<int>(floorf(0.5f + point.x() * scaleX));
    int y = static_cast<int>(floorf(0.5f + point.y() * scaleY));
    clip.setRect(x - 1, y - 1, x + 1, y + 1);

    return rgn.setPath(scaledPath, clip);
}

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

  Rect bounds = GetBounds(aTransform);

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

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

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