GrBlurUtils Namespace Reference

Classes
struct	DrawRectData

Functions
static bool	clip_bounds_quick_reject (const SkIRect &clipBounds, const SkIRect &rect)
static bool	draw_mask (skgpu::ganesh::SurfaceDrawContext *sdc, const GrClip *clip, const SkMatrix &viewMatrix, const SkIRect &maskBounds, GrPaint &&paint, GrSurfaceProxyView mask)
static void	mask_release_proc (void *addr, void *)
static sk_sp< SkData >	create_data (const SkIRect &drawRect, const SkIRect &origDevBounds)
static SkIRect	extract_draw_rect_from_data (SkData *data, const SkIRect &origDevBounds)
static GrSurfaceProxyView	sw_create_filtered_mask (GrRecordingContext *rContext, const SkMatrix &viewMatrix, const GrStyledShape &shape, const SkMaskFilter *filter, const SkIRect &unclippedDevShapeBounds, const SkIRect &clipBounds, SkIRect *drawRect, skgpu::UniqueKey *key)
static std::unique_ptr< skgpu::ganesh::SurfaceDrawContext >	create_mask_GPU (GrRecordingContext *rContext, const SkIRect &maskRect, const SkMatrix &origViewMatrix, const GrStyledShape &shape, int sampleCnt)
static bool	get_unclipped_shape_dev_bounds (const GrStyledShape &shape, const SkMatrix &matrix, SkIRect *devBounds)
static bool	get_shape_and_clip_bounds (skgpu::ganesh::SurfaceDrawContext *sdc, const GrClip *clip, const GrStyledShape &shape, const SkMatrix &matrix, SkIRect *unclippedDevShapeBounds, SkIRect *devClipBounds)
static bool	can_filter_mask (const SkMaskFilterBase *maskFilter, const GrStyledShape &shape, const SkIRect &devSpaceShapeBounds, const SkIRect &clipBounds, const SkMatrix &ctm, SkIRect *maskRect)
static std::unique_ptr< GrFragmentProcessor >	create_profile_effect (GrRecordingContext *rContext, const SkRect &circle, float sigma, float *solidRadius, float *textureRadius)
static std::unique_ptr< GrFragmentProcessor >	make_circle_blur (GrRecordingContext *context, const SkRect &circle, float sigma)
static std::unique_ptr< GrFragmentProcessor >	make_rect_integral_fp (GrRecordingContext *rContext, float sixSigma)
static std::unique_ptr< GrFragmentProcessor >	make_rect_blur (GrRecordingContext *context, const GrShaderCaps &caps, const SkRect &srcRect, const SkMatrix &viewMatrix, float transformedSigma)
static void	make_blurred_rrect_key (skgpu::UniqueKey *key, const SkRRect &rrectToDraw, float xformedSigma)
static bool	fillin_view_on_gpu (GrDirectContext *dContext, const GrSurfaceProxyView &lazyView, GrThreadSafeCache::Trampoline *trampoline, const SkRRect &rrectToDraw, const SkISize &dimensions, float xformedSigma)
static GrSurfaceProxyView	create_mask_on_cpu (GrRecordingContext *rContext, const SkRRect &rrectToDraw, const SkISize &dimensions, float xformedSigma)
static std::unique_ptr< GrFragmentProcessor >	find_or_create_rrect_blur_mask_fp (GrRecordingContext *rContext, const SkRRect &rrectToDraw, const SkISize &dimensions, float xformedSigma)
static std::unique_ptr< GrFragmentProcessor >	make_rrect_blur (GrRecordingContext *context, float sigma, float xformedSigma, const SkRRect &srcRRect, const SkRRect &devRRect)
static bool	direct_filter_mask (GrRecordingContext *context, const SkMaskFilterBase *maskFilter, skgpu::ganesh::SurfaceDrawContext *sdc, GrPaint &&paint, const GrClip *clip, const SkMatrix &viewMatrix, const GrStyledShape &shape)
static bool	compute_key_and_clip_bounds (skgpu::UniqueKey *maskKey, SkIRect *boundsForClip, const GrCaps *caps, const SkMatrix &viewMatrix, bool inverseFilled, const SkMaskFilterBase *maskFilter, const GrStyledShape &shape, const SkIRect &unclippedDevShapeBounds, const SkIRect &devClipBounds)
static GrSurfaceProxyView	filter_mask (GrRecordingContext *context, const SkMaskFilterBase *maskFilter, GrSurfaceProxyView srcView, GrColorType srcColorType, SkAlphaType srcAlphaType, const SkMatrix &ctm, const SkIRect &maskRect)
static GrSurfaceProxyView	hw_create_filtered_mask (GrDirectContext *dContext, skgpu::ganesh::SurfaceDrawContext *sdc, const SkMatrix &viewMatrix, const GrStyledShape &shape, const SkMaskFilterBase *filter, const SkIRect &unclippedDevShapeBounds, const SkIRect &clipBounds, SkIRect *maskRect, skgpu::UniqueKey *key)
static void	draw_shape_with_mask_filter (GrRecordingContext *rContext, skgpu::ganesh::SurfaceDrawContext *sdc, const GrClip *clip, GrPaint &&paint, const SkMatrix &viewMatrix, const SkMaskFilterBase *maskFilter, const GrStyledShape &origShape)
bool	ComputeBlurredRRectParams (const SkRRect &srcRRect, const SkRRect &devRRect, SkScalar sigma, SkScalar xformedSigma, SkRRect *rrectToDraw, SkISize *widthHeight, SkScalar rectXs[kBlurRRectMaxDivisions], SkScalar rectYs[kBlurRRectMaxDivisions], SkScalar texXs[kBlurRRectMaxDivisions], SkScalar texYs[kBlurRRectMaxDivisions])
void	DrawShapeWithMaskFilter (GrRecordingContext *rContext, skgpu::ganesh::SurfaceDrawContext *sdc, const GrClip *clip, const GrStyledShape &shape, GrPaint &&paint, const SkMatrix &viewMatrix, const SkMaskFilter *mf)
void	DrawShapeWithMaskFilter (GrRecordingContext *rContext, skgpu::ganesh::SurfaceDrawContext *sdc, const GrClip *clip, const SkPaint &paint, const SkMatrix &ctm, const GrStyledShape &shape)
static void	convolve_gaussian_1d (skgpu::ganesh::SurfaceFillContext *sfc, GrSurfaceProxyView srcView, const SkIRect &srcSubset, SkIVector dstToSrcOffset, const SkIRect &dstRect, SkAlphaType srcAlphaType, Direction direction, int radius, float sigma, SkTileMode mode)
static std::unique_ptr< skgpu::ganesh::SurfaceDrawContext >	convolve_gaussian_2d (GrRecordingContext *rContext, GrSurfaceProxyView srcView, GrColorType srcColorType, const SkIRect &srcBounds, const SkIRect &dstBounds, int radiusX, int radiusY, SkScalar sigmaX, SkScalar sigmaY, SkTileMode mode, sk_sp< SkColorSpace > finalCS, SkBackingFit dstFit)
static std::unique_ptr< skgpu::ganesh::SurfaceDrawContext >	convolve_gaussian (GrRecordingContext *rContext, GrSurfaceProxyView srcView, GrColorType srcColorType, SkAlphaType srcAlphaType, SkIRect srcBounds, SkIRect dstBounds, Direction direction, int radius, float sigma, SkTileMode mode, sk_sp< SkColorSpace > finalCS, SkBackingFit fit)
static std::unique_ptr< skgpu::ganesh::SurfaceDrawContext >	reexpand (GrRecordingContext *rContext, std::unique_ptr< skgpu::ganesh::SurfaceContext > src, const SkRect &srcBounds, SkISize dstSize, sk_sp< SkColorSpace > colorSpace, SkBackingFit fit)
static std::unique_ptr< skgpu::ganesh::SurfaceDrawContext >	two_pass_gaussian (GrRecordingContext *rContext, GrSurfaceProxyView srcView, GrColorType srcColorType, SkAlphaType srcAlphaType, sk_sp< SkColorSpace > colorSpace, SkIRect srcBounds, SkIRect dstBounds, float sigmaX, float sigmaY, int radiusX, int radiusY, SkTileMode mode, SkBackingFit fit)
std::unique_ptr< skgpu::ganesh::SurfaceDrawContext >	GaussianBlur (GrRecordingContext *rContext, GrSurfaceProxyView srcView, GrColorType srcColorType, SkAlphaType srcAlphaType, sk_sp< SkColorSpace > colorSpace, SkIRect dstBounds, SkIRect srcBounds, float sigmaX, float sigmaY, SkTileMode mode, SkBackingFit fit)

Variables
static constexpr auto	kMaskOrigin = kTopLeft_GrSurfaceOrigin
static constexpr auto	kBlurredRRectMaskOrigin = kTopLeft_GrSurfaceOrigin
static constexpr int	kBlurRRectMaxDivisions = 6

Detailed Description

Blur utilities.

Function Documentation

can_filter_mask()

static bool GrBlurUtils::can_filter_mask ( const SkMaskFilterBase *  maskFilter, const GrStyledShape &  shape, const SkIRect &  devSpaceShapeBounds, const SkIRect &  clipBounds, const SkMatrix &  ctm, SkIRect *  maskRect  )

static

If we cannot create a FragmentProcess for a mask filter, we might have special logic for it here. That code path requires constructing a src mask as input. Since that is a potentially expensive operation, this function tests if filter_mask would succeed if the mask were to be created.

'maskRect' returns the device space portion of the mask that the filter needs. The mask passed into 'filter_mask' should have the same extent as 'maskRect' but be translated to the upper-left corner of the mask (i.e., (maskRect.fLeft, maskRect.fTop) appears at (0, 0) in the mask).

Logically, how this works is: can_filter_mask is called if (it returns true) the returned mask rect is used for quick rejecting the mask rect is used to generate the mask filter_mask is called to filter the mask

TODO: this should work as: if (can_filter_mask(devShape, ...)) // rect, rrect, drrect, path filter_mask(devShape, ...) this would hide the RRect special case and the mask generation

Definition at line 372 of file GrBlurUtils.cpp.

                                               {
    if (maskFilter->type() != SkMaskFilterBase::Type::kBlur) {
        return false;
    }
    auto bmf = static_cast<const SkBlurMaskFilterImpl*>(maskFilter);
    SkScalar xformedSigma = bmf->computeXformedSigma(ctm);
    if (skgpu::BlurIsEffectivelyIdentity(xformedSigma)) {
        *maskRect = devSpaceShapeBounds;
        return maskRect->intersect(clipBounds);
    }
 
    if (maskRect) {
        float sigma3 = 3 * xformedSigma;
 
        // Outset srcRect and clipRect by 3 * sigma, to compute affected blur area.
        SkIRect clipRect = clipBounds.makeOutset(sigma3, sigma3);
        SkIRect srcRect = devSpaceShapeBounds.makeOutset(sigma3, sigma3);
 
        if (!srcRect.intersect(clipRect)) {
            srcRect.setEmpty();
        }
        *maskRect = srcRect;
    }
 
    // We prefer to blur paths with small blur radii on the CPU.
    static const SkScalar kMIN_GPU_BLUR_SIZE  = SkIntToScalar(64);
    static const SkScalar kMIN_GPU_BLUR_SIGMA = SkIntToScalar(32);
 
    if (devSpaceShapeBounds.width() <= kMIN_GPU_BLUR_SIZE &&
        devSpaceShapeBounds.height() <= kMIN_GPU_BLUR_SIZE &&
        xformedSigma <= kMIN_GPU_BLUR_SIGMA) {
        return false;
    }
 
    return true;
}

clip_bounds_quick_reject()

static bool GrBlurUtils::clip_bounds_quick_reject ( const SkIRect &  clipBounds, const SkIRect &  rect  )

static

Definition at line 99 of file GrBlurUtils.cpp.

                                                                                     {
    return clipBounds.isEmpty() || rect.isEmpty() || !SkIRect::Intersects(clipBounds, rect);
}

compute_key_and_clip_bounds()

static bool GrBlurUtils::compute_key_and_clip_bounds ( skgpu::UniqueKey *  maskKey, SkIRect *  boundsForClip, const GrCaps *  caps, const SkMatrix &  viewMatrix, bool  inverseFilled, const SkMaskFilterBase *  maskFilter, const GrStyledShape &  shape, const SkIRect &  unclippedDevShapeBounds, const SkIRect &  devClipBounds  )

static

Definition at line 1136 of file GrBlurUtils.cpp.

                                                                      {
    SkASSERT(maskFilter);
    *boundsForClip = devClipBounds;
 
#ifndef SK_DISABLE_MASKFILTERED_MASK_CACHING
    // To prevent overloading the cache with entries during animations we limit the cache of masks
    // to cases where the matrix preserves axis alignment.
    bool useCache = !inverseFilled && viewMatrix.preservesAxisAlignment() &&
                    shape.hasUnstyledKey() && as_MFB(maskFilter)->asABlur(nullptr);
 
    if (useCache) {
        SkIRect clippedMaskRect, unClippedMaskRect;
        can_filter_mask(maskFilter, shape, unclippedDevShapeBounds, devClipBounds,
                        viewMatrix, &clippedMaskRect);
        if (clippedMaskRect.isEmpty()) {
            return false;
        }
        can_filter_mask(maskFilter, shape, unclippedDevShapeBounds, unclippedDevShapeBounds,
                        viewMatrix, &unClippedMaskRect);
 
        // Use the cache only if >50% of the filtered mask is visible.
        int unclippedWidth = unClippedMaskRect.width();
        int unclippedHeight = unClippedMaskRect.height();
        int64_t unclippedArea = sk_64_mul(unclippedWidth, unclippedHeight);
        int64_t clippedArea = sk_64_mul(clippedMaskRect.width(), clippedMaskRect.height());
        int maxTextureSize = caps->maxTextureSize();
        if (unclippedArea > 2 * clippedArea || unclippedWidth > maxTextureSize ||
            unclippedHeight > maxTextureSize) {
            useCache = false;
        } else {
            // Make the clip not affect the mask
            *boundsForClip = unclippedDevShapeBounds;
        }
    }
 
    if (useCache) {
        static const skgpu::UniqueKey::Domain kDomain = skgpu::UniqueKey::GenerateDomain();
        skgpu::UniqueKey::Builder builder(maskKey, kDomain, 5 + 2 + shape.unstyledKeySize(),
                                          "Mask Filtered Masks");
 
        // We require the upper left 2x2 of the matrix to match exactly for a cache hit.
        SkScalar sx = viewMatrix.get(SkMatrix::kMScaleX);
        SkScalar sy = viewMatrix.get(SkMatrix::kMScaleY);
        SkScalar kx = viewMatrix.get(SkMatrix::kMSkewX);
        SkScalar ky = viewMatrix.get(SkMatrix::kMSkewY);
        SkScalar tx = viewMatrix.get(SkMatrix::kMTransX);
        SkScalar ty = viewMatrix.get(SkMatrix::kMTransY);
        // Allow 8 bits each in x and y of subpixel positioning. But, note that we're allowing
        // reuse for integer translations.
        SkFixed fracX = SkScalarToFixed(SkScalarFraction(tx)) & 0x0000FF00;
        SkFixed fracY = SkScalarToFixed(SkScalarFraction(ty)) & 0x0000FF00;
 
        builder[0] = SkFloat2Bits(sx);
        builder[1] = SkFloat2Bits(sy);
        builder[2] = SkFloat2Bits(kx);
        builder[3] = SkFloat2Bits(ky);
        // Distinguish between hairline and filled paths. For hairlines, we also need to include
        // the cap. (SW grows hairlines by 0.5 pixel with round and square caps). Note that
        // stroke-and-fill of hairlines is turned into pure fill by SkStrokeRec, so this covers
        // all cases we might see.
        uint32_t styleBits = shape.style().isSimpleHairline()
                                    ? ((shape.style().strokeRec().getCap() << 1) | 1)
                                    : 0;
        builder[4] = fracX | (fracY >> 8) | (styleBits << 16);
 
        SkMaskFilterBase::BlurRec rec;
        SkAssertResult(as_MFB(maskFilter)->asABlur(&rec));
 
        builder[5] = rec.fStyle;  // TODO: we could put this with the other style bits
        builder[6] = SkFloat2Bits(rec.fSigma);
        shape.writeUnstyledKey(&builder[7]);
    }
#endif
 
    return true;
}

ComputeBlurredRRectParams()

bool GrBlurUtils::ComputeBlurredRRectParams	(	const SkRRect &	srcRRect,
		const SkRRect &	devRRect,
		SkScalar	sigma,
		SkScalar	xformedSigma,
		SkRRect *	rrectToDraw,
		SkISize *	widthHeight,
		SkScalar	rectXs[kBlurRRectMaxDivisions],
		SkScalar	rectYs[kBlurRRectMaxDivisions],
		SkScalar	texXs[kBlurRRectMaxDivisions],
		SkScalar	texYs[kBlurRRectMaxDivisions]
	)

This method computes all the parameters for drawing a partially occluded nine-patched blurred rrect mask: rrectToDraw - the integerized rrect to draw in the mask widthHeight - how large to make the mask (rrectToDraw will be centered in this coord system). rectXs, rectYs - the x & y coordinates of the covering geometry lattice texXs, texYs - the texture coordinate at each point in rectXs & rectYs It returns true if 'devRRect' is nine-patchable

Definition at line 1465 of file GrBlurUtils.cpp.

                                                                       {
    unsigned int devBlurRadius = 3 * SkScalarCeilToInt(xformedSigma - 1 / 6.0f);
    SkScalar srcBlurRadius = 3.0f * sigma;
 
    const SkRect& devOrig = devRRect.getBounds();
    const SkVector& devRadiiUL = devRRect.radii(SkRRect::kUpperLeft_Corner);
    const SkVector& devRadiiUR = devRRect.radii(SkRRect::kUpperRight_Corner);
    const SkVector& devRadiiLR = devRRect.radii(SkRRect::kLowerRight_Corner);
    const SkVector& devRadiiLL = devRRect.radii(SkRRect::kLowerLeft_Corner);
 
    const int devLeft = SkScalarCeilToInt(std::max<SkScalar>(devRadiiUL.fX, devRadiiLL.fX));
    const int devTop = SkScalarCeilToInt(std::max<SkScalar>(devRadiiUL.fY, devRadiiUR.fY));
    const int devRight = SkScalarCeilToInt(std::max<SkScalar>(devRadiiUR.fX, devRadiiLR.fX));
    const int devBot = SkScalarCeilToInt(std::max<SkScalar>(devRadiiLL.fY, devRadiiLR.fY));
 
    // This is a conservative check for nine-patchability
    if (devOrig.fLeft + devLeft + devBlurRadius >= devOrig.fRight - devRight - devBlurRadius ||
        devOrig.fTop + devTop + devBlurRadius >= devOrig.fBottom - devBot - devBlurRadius) {
        return false;
    }
 
    const SkVector& srcRadiiUL = srcRRect.radii(SkRRect::kUpperLeft_Corner);
    const SkVector& srcRadiiUR = srcRRect.radii(SkRRect::kUpperRight_Corner);
    const SkVector& srcRadiiLR = srcRRect.radii(SkRRect::kLowerRight_Corner);
    const SkVector& srcRadiiLL = srcRRect.radii(SkRRect::kLowerLeft_Corner);
 
    const SkScalar srcLeft = std::max<SkScalar>(srcRadiiUL.fX, srcRadiiLL.fX);
    const SkScalar srcTop = std::max<SkScalar>(srcRadiiUL.fY, srcRadiiUR.fY);
    const SkScalar srcRight = std::max<SkScalar>(srcRadiiUR.fX, srcRadiiLR.fX);
    const SkScalar srcBot = std::max<SkScalar>(srcRadiiLL.fY, srcRadiiLR.fY);
 
    int newRRWidth = 2 * devBlurRadius + devLeft + devRight + 1;
    int newRRHeight = 2 * devBlurRadius + devTop + devBot + 1;
    widthHeight->fWidth = newRRWidth + 2 * devBlurRadius;
    widthHeight->fHeight = newRRHeight + 2 * devBlurRadius;
 
    const SkRect srcProxyRect = srcRRect.getBounds().makeOutset(srcBlurRadius, srcBlurRadius);
 
    rectXs[0] = srcProxyRect.fLeft;
    rectXs[1] = srcProxyRect.fLeft + 2 * srcBlurRadius + srcLeft;
    rectXs[2] = srcProxyRect.fRight - 2 * srcBlurRadius - srcRight;
    rectXs[3] = srcProxyRect.fRight;
 
    rectYs[0] = srcProxyRect.fTop;
    rectYs[1] = srcProxyRect.fTop + 2 * srcBlurRadius + srcTop;
    rectYs[2] = srcProxyRect.fBottom - 2 * srcBlurRadius - srcBot;
    rectYs[3] = srcProxyRect.fBottom;
 
    texXs[0] = 0.0f;
    texXs[1] = 2.0f * devBlurRadius + devLeft;
    texXs[2] = 2.0f * devBlurRadius + devLeft + 1;
    texXs[3] = SkIntToScalar(widthHeight->fWidth);
 
    texYs[0] = 0.0f;
    texYs[1] = 2.0f * devBlurRadius + devTop;
    texYs[2] = 2.0f * devBlurRadius + devTop + 1;
    texYs[3] = SkIntToScalar(widthHeight->fHeight);
 
    const SkRect newRect = SkRect::MakeXYWH(SkIntToScalar(devBlurRadius),
                                            SkIntToScalar(devBlurRadius),
                                            SkIntToScalar(newRRWidth),
                                            SkIntToScalar(newRRHeight));
    SkVector newRadii[4];
    newRadii[0] = {SkScalarCeilToScalar(devRadiiUL.fX), SkScalarCeilToScalar(devRadiiUL.fY)};
    newRadii[1] = {SkScalarCeilToScalar(devRadiiUR.fX), SkScalarCeilToScalar(devRadiiUR.fY)};
    newRadii[2] = {SkScalarCeilToScalar(devRadiiLR.fX), SkScalarCeilToScalar(devRadiiLR.fY)};
    newRadii[3] = {SkScalarCeilToScalar(devRadiiLL.fX), SkScalarCeilToScalar(devRadiiLL.fY)};
 
    rrectToDraw->setRectRadii(newRect, newRadii);
    return true;
}

convolve_gaussian()

static std::unique_ptr< skgpu::ganesh::SurfaceDrawContext > GrBlurUtils::convolve_gaussian ( GrRecordingContext *  rContext, GrSurfaceProxyView  srcView, GrColorType  srcColorType, SkAlphaType  srcAlphaType, SkIRect  srcBounds, SkIRect  dstBounds, Direction  direction, int  radius, float  sigma, SkTileMode  mode, sk_sp< SkColorSpace >  finalCS, SkBackingFit  fit  )

static

Definition at line 1742 of file GrBlurUtils.cpp.

                          {
    SkASSERT(radius > 0 && !skgpu::BlurIsEffectivelyIdentity(sigma));
    // Logically we're creating an infinite blur of 'srcBounds' of 'srcView' with 'mode' tiling
    // and then capturing the 'dstBounds' portion in a new RTC where the top left of 'dstBounds' is
    // at {0, 0} in the new RTC.
    //
    // Create the sdc with default SkSurfaceProps. Gaussian blurs will soon use a
    // SurfaceFillContext, at which point the SkSurfaceProps won't exist anymore.
    auto dstSDC =
            skgpu::ganesh::SurfaceDrawContext::Make(rContext,
                                                    srcColorType,
                                                    std::move(finalCS),
                                                    fit,
                                                    dstBounds.size(),
                                                    SkSurfaceProps(),
                                                    /*label=*/"SurfaceDrawContext_ConvolveGaussian",
                                                    /* sampleCnt= */ 1,
                                                    skgpu::Mipmapped::kNo,
                                                    srcView.proxy()->isProtected(),
                                                    srcView.origin());
    if (!dstSDC) {
        return nullptr;
    }
    // This represents the translation from 'dstSurfaceDrawContext' coords to 'srcView' coords.
    auto rtcToSrcOffset = dstBounds.topLeft();
 
    auto srcBackingBounds = SkIRect::MakeSize(srcView.proxy()->backingStoreDimensions());
    // We've implemented splitting the dst bounds up into areas that do and do not need to
    // use shader based tiling but only for some modes...
    bool canSplit = mode == SkTileMode::kDecal || mode == SkTileMode::kClamp;
    // ...but it's not worth doing the splitting if we'll get HW tiling instead of shader tiling.
    bool canHWTile =
            srcBounds.contains(srcBackingBounds) &&
            !rContext->priv().caps()->reducedShaderMode() &&  // this mode always uses shader tiling
            !(mode == SkTileMode::kDecal && !rContext->priv().caps()->clampToBorderSupport());
    if (!canSplit || canHWTile) {
        auto dstRect = SkIRect::MakeSize(dstBounds.size());
        convolve_gaussian_1d(dstSDC.get(),
                             std::move(srcView),
                             srcBounds,
                             rtcToSrcOffset,
                             dstRect,
                             srcAlphaType,
                             direction,
                             radius,
                             sigma,
                             mode);
        return dstSDC;
    }
 
    // 'left' and 'right' are the sub rects of 'srcBounds' where 'mode' must be enforced.
    // 'mid' is the area where we can ignore the mode because the kernel does not reach to the
    // edge of 'srcBounds'.
    SkIRect mid, left, right;
    // 'top' and 'bottom' are areas of 'dstBounds' that are entirely above/below 'srcBounds'.
    // These are areas that we can simply clear in the dst in kDecal mode. If 'srcBounds'
    // straddles the top edge of 'dstBounds' then 'top' will be inverted and we will skip
    // processing for the rect. Similar for 'bottom'. The positional/directional labels above refer
    // to the Direction::kX case and one should think of these as 'left' and 'right' for
    // Direction::kY.
    SkIRect top, bottom;
    if (Direction::kX == direction) {
        top = {dstBounds.left(), dstBounds.top(), dstBounds.right(), srcBounds.top()};
        bottom = {dstBounds.left(), srcBounds.bottom(), dstBounds.right(), dstBounds.bottom()};
 
        // Inset for sub-rect of 'srcBounds' where the x-dir kernel doesn't reach the edges, clipped
        // vertically to dstBounds.
        int midA = std::max(srcBounds.top(), dstBounds.top());
        int midB = std::min(srcBounds.bottom(), dstBounds.bottom());
        mid = {srcBounds.left() + radius, midA, srcBounds.right() - radius, midB};
        if (mid.isEmpty()) {
            // There is no middle where the bounds can be ignored. Make the left span the whole
            // width of dst and we will not draw mid or right.
            left = {dstBounds.left(), mid.top(), dstBounds.right(), mid.bottom()};
        } else {
            left = {dstBounds.left(), mid.top(), mid.left(), mid.bottom()};
            right = {mid.right(), mid.top(), dstBounds.right(), mid.bottom()};
        }
    } else {
        // This is the same as the x direction code if you turn your head 90 degrees CCW. Swap x and
        // y and swap top/bottom with left/right.
        top = {dstBounds.left(), dstBounds.top(), srcBounds.left(), dstBounds.bottom()};
        bottom = {srcBounds.right(), dstBounds.top(), dstBounds.right(), dstBounds.bottom()};
 
        int midA = std::max(srcBounds.left(), dstBounds.left());
        int midB = std::min(srcBounds.right(), dstBounds.right());
        mid = {midA, srcBounds.top() + radius, midB, srcBounds.bottom() - radius};
 
        if (mid.isEmpty()) {
            left = {mid.left(), dstBounds.top(), mid.right(), dstBounds.bottom()};
        } else {
            left = {mid.left(), dstBounds.top(), mid.right(), mid.top()};
            right = {mid.left(), mid.bottom(), mid.right(), dstBounds.bottom()};
        }
    }
 
    auto convolve = [&](SkIRect rect) {
        // Transform rect into the render target's coord system.
        rect.offset(-rtcToSrcOffset);
        convolve_gaussian_1d(dstSDC.get(),
                             srcView,
                             srcBounds,
                             rtcToSrcOffset,
                             rect,
                             srcAlphaType,
                             direction,
                             radius,
                             sigma,
                             mode);
    };
    auto clear = [&](SkIRect rect) {
        // Transform rect into the render target's coord system.
        rect.offset(-rtcToSrcOffset);
        dstSDC->clearAtLeast(rect, SK_PMColor4fTRANSPARENT);
    };
 
    // Doing mid separately will cause two draws to occur (left and right batch together). At
    // small sizes of mid it is worse to issue more draws than to just execute the slightly
    // more complicated shader that implements the tile mode across mid. This threshold is
    // very arbitrary right now. It is believed that a 21x44 mid on a Moto G4 is a significant
    // regression compared to doing one draw but it has not been locally evaluated or tuned.
    // The optimal cutoff is likely to vary by GPU.
    if (!mid.isEmpty() && mid.width() * mid.height() < 256 * 256) {
        left.join(mid);
        left.join(right);
        mid = SkIRect::MakeEmpty();
        right = SkIRect::MakeEmpty();
        // It's unknown whether for kDecal it'd be better to expand the draw rather than a draw and
        // up to two clears.
        if (mode == SkTileMode::kClamp) {
            left.join(top);
            left.join(bottom);
            top = SkIRect::MakeEmpty();
            bottom = SkIRect::MakeEmpty();
        }
    }
 
    if (!top.isEmpty()) {
        if (mode == SkTileMode::kDecal) {
            clear(top);
        } else {
            convolve(top);
        }
    }
 
    if (!bottom.isEmpty()) {
        if (mode == SkTileMode::kDecal) {
            clear(bottom);
        } else {
            convolve(bottom);
        }
    }
 
    if (mid.isEmpty()) {
        convolve(left);
    } else {
        convolve(left);
        convolve(right);
        convolve(mid);
    }
    return dstSDC;
}

convolve_gaussian_1d()

static void GrBlurUtils::convolve_gaussian_1d ( skgpu::ganesh::SurfaceFillContext *  sfc, GrSurfaceProxyView  srcView, const SkIRect &  srcSubset, SkIVector  dstToSrcOffset, const SkIRect &  dstRect, SkAlphaType  srcAlphaType, Direction  direction, int  radius, float  sigma, SkTileMode  mode  )

static

Draws 'dstRect' into 'surfaceFillContext' evaluating a 1D Gaussian over 'srcView'. The src rect is 'dstRect' offset by 'dstToSrcOffset'. 'mode' and 'bounds' are applied to the src coords.

Definition at line 1627 of file GrBlurUtils.cpp.

                                                  {
    SkASSERT(radius && !skgpu::BlurIsEffectivelyIdentity(sigma));
    auto srcRect = dstRect.makeOffset(dstToSrcOffset);
 
    std::array<SkV4, skgpu::kMaxBlurSamples/2> offsetsAndKernel;
    skgpu::Compute1DBlurLinearKernel(sigma, radius, offsetsAndKernel);
 
    // The child of the 1D linear blur effect must be linearly sampled.
    GrSamplerState sampler{SkTileModeToWrapMode(mode), GrSamplerState::Filter::kLinear};
 
    SkISize radii = {direction == Direction::kX ? radius : 0,
                     direction == Direction::kY ? radius : 0};
    std::unique_ptr<GrFragmentProcessor> child = make_texture_effect(sfc->caps(),
                                                                     std::move(srcView),
                                                                     srcAlphaType,
                                                                     sampler,
                                                                     srcSubset,
                                                                     srcRect,
                                                                     radii);
 
    auto conv = GrSkSLFP::Make(skgpu::GetLinearBlur1DEffect(radius),
                               "GaussianBlur1D",
                               /*inputFP=*/nullptr,
                               GrSkSLFP::OptFlags::kCompatibleWithCoverageAsAlpha,
                               "offsetsAndKernel", SkSpan<SkV4>{offsetsAndKernel},
                               "dir", direction == Direction::kX ? SkV2{1.f, 0.f}
                                                                 : SkV2{0.f, 1.f},
                               "child", std::move(child));
    sfc->fillRectToRectWithFP(srcRect, dstRect, std::move(conv));
}

convolve_gaussian_2d()

static std::unique_ptr< skgpu::ganesh::SurfaceDrawContext > GrBlurUtils::convolve_gaussian_2d ( GrRecordingContext *  rContext, GrSurfaceProxyView  srcView, GrColorType  srcColorType, const SkIRect &  srcBounds, const SkIRect &  dstBounds, int  radiusX, int  radiusY, SkScalar  sigmaX, SkScalar  sigmaY, SkTileMode  mode, sk_sp< SkColorSpace >  finalCS, SkBackingFit  dstFit  )

static

Definition at line 1667 of file GrBlurUtils.cpp.

                             {
    SkASSERT(radiusX && radiusY);
    SkASSERT(!skgpu::BlurIsEffectivelyIdentity(sigmaX) &&
             !skgpu::BlurIsEffectivelyIdentity(sigmaY));
    // Create the sdc with default SkSurfaceProps. Gaussian blurs will soon use a
    // SurfaceFillContext, at which point the SkSurfaceProps won't exist anymore.
    auto sdc = skgpu::ganesh::SurfaceDrawContext::Make(
            rContext,
            srcColorType,
            std::move(finalCS),
            dstFit,
            dstBounds.size(),
            SkSurfaceProps(),
            /*label=*/"SurfaceDrawContext_ConvolveGaussian2d",
            /* sampleCnt= */ 1,
            skgpu::Mipmapped::kNo,
            srcView.proxy()->isProtected(),
            srcView.origin());
    if (!sdc) {
        return nullptr;
    }
 
    // GaussianBlur() should have downsampled the request until we can handle the 2D blur with
    // just a uniform array, which is asserted inside the Compute function.
    const SkISize radii{radiusX, radiusY};
    std::array<SkV4, skgpu::kMaxBlurSamples/4> kernel;
    std::array<SkV4, skgpu::kMaxBlurSamples/2> offsets;
    skgpu::Compute2DBlurKernel({sigmaX, sigmaY}, radii, kernel);
    skgpu::Compute2DBlurOffsets(radii, offsets);
 
    GrSamplerState sampler{SkTileModeToWrapMode(mode), GrSamplerState::Filter::kNearest};
    auto child = make_texture_effect(sdc->caps(),
                                     std::move(srcView),
                                     kPremul_SkAlphaType,
                                     sampler,
                                     srcBounds,
                                     dstBounds,
                                     radii);
    auto conv = GrSkSLFP::Make(skgpu::GetBlur2DEffect(radii),
                               "GaussianBlur2D",
                               /*inputFP=*/nullptr,
                               GrSkSLFP::OptFlags::kNone,
                               "kernel", SkSpan<SkV4>{kernel},
                               "offsets", SkSpan<SkV4>{offsets},
                               "child", std::move(child));
 
    GrPaint paint;
    paint.setColorFragmentProcessor(std::move(conv));
    paint.setPorterDuffXPFactory(SkBlendMode::kSrc);
 
    // 'dstBounds' is actually in 'srcView' proxy space. It represents the blurred area from src
    // space that we want to capture in the new RTC at {0, 0}. Hence, we use its size as the rect to
    // draw and it directly as the local rect.
    sdc->fillRectToRect(nullptr,
                        std::move(paint),
                        GrAA::kNo,
                        SkMatrix::I(),
                        SkRect::Make(dstBounds.size()),
                        SkRect::Make(dstBounds));
 
    return sdc;
}

create_data()

static sk_sp< SkData > GrBlurUtils::create_data ( const SkIRect &  drawRect, const SkIRect &  origDevBounds  )

static

Definition at line 142 of file GrBlurUtils.cpp.

                                                                                        {
 
    DrawRectData drawRectData { {drawRect.fLeft - origDevBounds.fLeft,
                                 drawRect.fTop - origDevBounds.fTop},
                                drawRect.size() };
 
    return SkData::MakeWithCopy(&drawRectData, sizeof(drawRectData));
}

create_mask_GPU()

static std::unique_ptr< skgpu::ganesh::SurfaceDrawContext > GrBlurUtils::create_mask_GPU ( GrRecordingContext *  rContext, const SkIRect &  maskRect, const SkMatrix &  origViewMatrix, const GrStyledShape &  shape, int  sampleCnt  )

static

Definition at line 249 of file GrBlurUtils.cpp.

                       {
    // We cache blur masks. Use default surface props here so we can use the same cached mask
    // regardless of the final dst surface.
    SkSurfaceProps defaultSurfaceProps;
 
    // Use GetApproxSize to implement our own approximate size matching, but demand
    // a "SkBackingFit::kExact" size match on the actual render target. We do this because the
    // filter will reach outside the src bounds, so we need to pre-clear these values to ensure a
    // "decal" sampling effect (i.e., ensure reads outside the src bounds return alpha=0).
    //
    // FIXME: Reads outside the left and top edges will actually clamp to the edge pixel. And in the
    // event that GetApproxSize does not change the size, reads outside the right and/or bottom will
    // do the same. We should offset our filter within the render target and expand the size as
    // needed to guarantee at least 1px of padding on all sides.
    auto approxSize = skgpu::GetApproxSize(maskRect.size());
    auto sdc = skgpu::ganesh::SurfaceDrawContext::MakeWithFallback(rContext,
                                                                   GrColorType::kAlpha_8,
                                                                   nullptr,
                                                                   SkBackingFit::kExact,
                                                                   approxSize,
                                                                   defaultSurfaceProps,
                                                                   sampleCnt,
                                                                   skgpu::Mipmapped::kNo,
                                                                   GrProtected::kNo,
                                                                   kMaskOrigin);
    if (!sdc) {
        return nullptr;
    }
 
    sdc->clear(SK_PMColor4fTRANSPARENT);
 
    GrPaint maskPaint;
    maskPaint.setCoverageSetOpXPFactory(SkRegion::kReplace_Op);
 
    // setup new clip
    GrFixedClip clip(sdc->dimensions(), SkIRect::MakeWH(maskRect.width(), maskRect.height()));
 
    // Draw the mask into maskTexture with the path's integerized top-left at the origin using
    // maskPaint.
    SkMatrix viewMatrix = origViewMatrix;
    viewMatrix.postTranslate(-SkIntToScalar(maskRect.fLeft), -SkIntToScalar(maskRect.fTop));
    sdc->drawShape(&clip, std::move(maskPaint), GrAA::kYes, viewMatrix, GrStyledShape(shape));
    return sdc;
}

create_mask_on_cpu()

static GrSurfaceProxyView GrBlurUtils::create_mask_on_cpu ( GrRecordingContext *  rContext, const SkRRect &  rrectToDraw, const SkISize &  dimensions, float  xformedSigma  )

static

Definition at line 801 of file GrBlurUtils.cpp.

                                                                 {
    SkBitmap result = skgpu::CreateRRectBlurMask(rrectToDraw, dimensions, xformedSigma);
    if (result.empty()) {
        return {};
    }
 
    auto view = std::get<0>(GrMakeUncachedBitmapProxyView(rContext, result));
    if (!view) {
        return {};
    }
 
    SkASSERT(view.origin() == kBlurredRRectMaskOrigin);
    return view;
}

create_profile_effect()

static std::unique_ptr< GrFragmentProcessor > GrBlurUtils::create_profile_effect ( GrRecordingContext *  rContext, const SkRect &  circle, float  sigma, float *  solidRadius, float *  textureRadius  )

static

Definition at line 418 of file GrBlurUtils.cpp.

                                                                                        {
    float circleR = circle.width() / 2.0f;
    if (!SkIsFinite(circleR) || circleR < SK_ScalarNearlyZero) {
        return nullptr;
    }
 
    auto threadSafeCache = rContext->priv().threadSafeCache();
 
    // Profile textures are cached by the ratio of sigma to circle radius and by the size of the
    // profile texture (binned by powers of 2).
    SkScalar sigmaToCircleRRatio = sigma / circleR;
    // When sigma is really small this becomes a equivalent to convolving a Gaussian with a
    // half-plane. Similarly, in the extreme high ratio cases circle becomes a point WRT to the
    // Guassian and the profile texture is a just a Gaussian evaluation. However, we haven't yet
    // implemented this latter optimization.
    sigmaToCircleRRatio = std::min(sigmaToCircleRRatio, 8.f);
    SkFixed sigmaToCircleRRatioFixed;
    static const SkScalar kHalfPlaneThreshold = 0.1f;
    bool useHalfPlaneApprox = false;
    if (sigmaToCircleRRatio <= kHalfPlaneThreshold) {
        useHalfPlaneApprox = true;
        sigmaToCircleRRatioFixed = 0;
        *solidRadius = circleR - 3 * sigma;
        *textureRadius = 6 * sigma;
    } else {
        // Convert to fixed point for the key.
        sigmaToCircleRRatioFixed = SkScalarToFixed(sigmaToCircleRRatio);
        // We shave off some bits to reduce the number of unique entries. We could probably
        // shave off more than we do.
        sigmaToCircleRRatioFixed &= ~0xff;
        sigmaToCircleRRatio = SkFixedToScalar(sigmaToCircleRRatioFixed);
        sigma = circleR * sigmaToCircleRRatio;
        *solidRadius = 0;
        *textureRadius = circleR + 3 * sigma;
    }
 
    static constexpr int kProfileTextureWidth = 512;
    // This would be kProfileTextureWidth/textureRadius if it weren't for the fact that we do
    // the calculation of the profile coord in a coord space that has already been scaled by
    // 1 / textureRadius. This is done to avoid overflow in length().
    SkMatrix texM = SkMatrix::Scale(kProfileTextureWidth, 1.f);
 
    static const skgpu::UniqueKey::Domain kDomain = skgpu::UniqueKey::GenerateDomain();
    skgpu::UniqueKey key;
    skgpu::UniqueKey::Builder builder(&key, kDomain, 1, "1-D Circular Blur");
    builder[0] = sigmaToCircleRRatioFixed;
    builder.finish();
 
    GrSurfaceProxyView profileView = threadSafeCache->find(key);
    if (profileView) {
        SkASSERT(profileView.asTextureProxy());
        SkASSERT(profileView.origin() == kTopLeft_GrSurfaceOrigin);
        return GrTextureEffect::Make(std::move(profileView), kPremul_SkAlphaType, texM);
    }
 
    SkBitmap bm;
    if (useHalfPlaneApprox) {
        bm = skgpu::CreateHalfPlaneProfile(kProfileTextureWidth);
    } else {
        // Rescale params to the size of the texture we're creating.
        SkScalar scale = kProfileTextureWidth / *textureRadius;
        bm = skgpu::CreateCircleProfile(sigma * scale, circleR * scale, kProfileTextureWidth);
    }
 
    profileView = std::get<0>(GrMakeUncachedBitmapProxyView(rContext, bm));
    if (!profileView) {
        return nullptr;
    }
 
    profileView = threadSafeCache->add(key, profileView);
    return GrTextureEffect::Make(std::move(profileView), kPremul_SkAlphaType, texM);
}

direct_filter_mask()

static bool GrBlurUtils::direct_filter_mask ( GrRecordingContext *  context, const SkMaskFilterBase *  maskFilter, skgpu::ganesh::SurfaceDrawContext *  sdc, GrPaint &&  paint, const GrClip *  clip, const SkMatrix &  viewMatrix, const GrStyledShape &  shape  )

static

Try to directly render the mask filter into the target. Returns true if drawing was successful. If false is returned then paint is unmodified.

Definition at line 1009 of file GrBlurUtils.cpp.

                                                           {
    SkASSERT(sdc);
    if (maskFilter->type() != SkMaskFilterBase::Type::kBlur) {
        return false;
    }
    auto bmf = static_cast<const SkBlurMaskFilterImpl*>(maskFilter);
 
    if (bmf->blurStyle() != kNormal_SkBlurStyle) {
        return false;
    }
 
    // TODO: we could handle blurred stroked circles
    if (!shape.style().isSimpleFill()) {
        return false;
    }
 
    SkScalar xformedSigma = bmf->computeXformedSigma(viewMatrix);
    if (skgpu::BlurIsEffectivelyIdentity(xformedSigma)) {
        sdc->drawShape(clip, std::move(paint), GrAA::kYes, viewMatrix, GrStyledShape(shape));
        return true;
    }
 
    SkRRect srcRRect;
    bool inverted;
    if (!shape.asRRect(&srcRRect, &inverted) || inverted) {
        return false;
    }
 
    std::unique_ptr<GrFragmentProcessor> fp;
 
    SkRRect devRRect;
    bool devRRectIsValid = srcRRect.transform(viewMatrix, &devRRect);
 
    bool devRRectIsCircle = devRRectIsValid && SkRRectPriv::IsCircle(devRRect);
 
    bool canBeRect = srcRRect.isRect() && viewMatrix.preservesRightAngles();
    bool canBeCircle = (SkRRectPriv::IsCircle(srcRRect) && viewMatrix.isSimilarity()) ||
                       devRRectIsCircle;
 
    if (canBeRect || canBeCircle) {
        if (canBeRect) {
            fp = make_rect_blur(context, *context->priv().caps()->shaderCaps(),
                                srcRRect.rect(), viewMatrix, xformedSigma);
        } else {
            SkRect devBounds;
            if (devRRectIsCircle) {
                devBounds = devRRect.getBounds();
            } else {
                SkPoint center = {srcRRect.getBounds().centerX(), srcRRect.getBounds().centerY()};
                viewMatrix.mapPoints(&center, 1);
                SkScalar radius = viewMatrix.mapVector(0, srcRRect.width()/2.f).length();
                devBounds = {center.x() - radius,
                             center.y() - radius,
                             center.x() + radius,
                             center.y() + radius};
            }
            fp = make_circle_blur(context, devBounds, xformedSigma);
        }
 
        if (!fp) {
            return false;
        }
 
        SkRect srcProxyRect = srcRRect.rect();
        // Determine how much to outset the src rect to ensure we hit pixels within three sigma.
        SkScalar outsetX = 3.0f*xformedSigma;
        SkScalar outsetY = 3.0f*xformedSigma;
        if (viewMatrix.isScaleTranslate()) {
            outsetX /= SkScalarAbs(viewMatrix.getScaleX());
            outsetY /= SkScalarAbs(viewMatrix.getScaleY());
        } else {
            SkSize scale;
            if (!viewMatrix.decomposeScale(&scale, nullptr)) {
                return false;
            }
            outsetX /= scale.width();
            outsetY /= scale.height();
        }
        srcProxyRect.outset(outsetX, outsetY);
 
        paint.setCoverageFragmentProcessor(std::move(fp));
        sdc->drawRect(clip, std::move(paint), GrAA::kNo, viewMatrix, srcProxyRect);
        return true;
    }
    if (!viewMatrix.isScaleTranslate()) {
        return false;
    }
    if (!devRRectIsValid || !SkRRectPriv::AllCornersCircular(devRRect)) {
        return false;
    }
 
    fp = make_rrect_blur(context, bmf->sigma(), xformedSigma, srcRRect, devRRect);
    if (!fp) {
        return false;
    }
 
    if (!bmf->ignoreXform()) {
        SkRect srcProxyRect = srcRRect.rect();
        srcProxyRect.outset(3.0f*bmf->sigma(), 3.0f*bmf->sigma());
        paint.setCoverageFragmentProcessor(std::move(fp));
        sdc->drawRect(clip, std::move(paint), GrAA::kNo, viewMatrix, srcProxyRect);
    } else {
        SkMatrix inverse;
        if (!viewMatrix.invert(&inverse)) {
            return false;
        }
 
        SkIRect proxyBounds;
        float extra=3.f*SkScalarCeilToScalar(xformedSigma-1/6.0f);
        devRRect.rect().makeOutset(extra, extra).roundOut(&proxyBounds);
 
        paint.setCoverageFragmentProcessor(std::move(fp));
        sdc->fillPixelsWithLocalMatrix(clip, std::move(paint), proxyBounds, inverse);
    }
 
    return true;
}

draw_mask()

static bool GrBlurUtils::draw_mask ( skgpu::ganesh::SurfaceDrawContext *  sdc, const GrClip *  clip, const SkMatrix &  viewMatrix, const SkIRect &  maskBounds, GrPaint &&  paint, GrSurfaceProxyView  mask  )

static

Definition at line 108 of file GrBlurUtils.cpp.

                                               {
    SkMatrix inverse;
    if (!viewMatrix.invert(&inverse)) {
        return false;
    }
 
    mask.concatSwizzle(skgpu::Swizzle("aaaa"));
 
    SkMatrix matrix = SkMatrix::Translate(-SkIntToScalar(maskBounds.fLeft),
                                          -SkIntToScalar(maskBounds.fTop));
    matrix.preConcat(viewMatrix);
    paint.setCoverageFragmentProcessor(
            GrTextureEffect::Make(std::move(mask), kUnknown_SkAlphaType, matrix));
 
    sdc->fillPixelsWithLocalMatrix(clip, std::move(paint), maskBounds, inverse);
    return true;
}

draw_shape_with_mask_filter()

static void GrBlurUtils::draw_shape_with_mask_filter ( GrRecordingContext *  rContext, skgpu::ganesh::SurfaceDrawContext *  sdc, const GrClip *  clip, GrPaint &&  paint, const SkMatrix &  viewMatrix, const SkMaskFilterBase *  maskFilter, const GrStyledShape &  origShape  )

static

Definition at line 1376 of file GrBlurUtils.cpp.

                                                                        {
    SkASSERT(maskFilter);
 
    const GrStyledShape* shape = &origShape;
    SkTLazy<GrStyledShape> tmpShape;
 
    if (origShape.style().applies()) {
        SkScalar styleScale =  GrStyle::MatrixToScaleFactor(viewMatrix);
        if (styleScale == 0) {
            return;
        }
 
        tmpShape.init(origShape.applyStyle(GrStyle::Apply::kPathEffectAndStrokeRec, styleScale));
        if (tmpShape->isEmpty()) {
            return;
        }
 
        shape = tmpShape.get();
    }
 
    if (direct_filter_mask(rContext, maskFilter, sdc, std::move(paint), clip, viewMatrix, *shape)) {
        // the mask filter was able to draw itself directly, so there's nothing
        // left to do.
        return;
    }
    assert_alive(paint);
 
    // If the path is hairline, ignore inverse fill.
    bool inverseFilled = shape->inverseFilled() &&
                         !GrIsStrokeHairlineOrEquivalent(shape->style(), viewMatrix, nullptr);
 
    SkIRect unclippedDevShapeBounds, devClipBounds;
    if (!get_shape_and_clip_bounds(sdc, clip, *shape, viewMatrix,
                                   &unclippedDevShapeBounds, &devClipBounds)) {
        // TODO: just cons up an opaque mask here
        if (!inverseFilled) {
            return;
        }
    }
 
    skgpu::UniqueKey maskKey;
    SkIRect boundsForClip;
    if (!compute_key_and_clip_bounds(&maskKey, &boundsForClip,
                                     sdc->caps(),
                                     viewMatrix, inverseFilled,
                                     maskFilter, *shape,
                                     unclippedDevShapeBounds,
                                     devClipBounds)) {
        return; // 'shape' was entirely clipped out
    }
 
    GrSurfaceProxyView filteredMaskView;
    SkIRect maskRect;
 
    if (auto dContext = rContext->asDirectContext()) {
        filteredMaskView = hw_create_filtered_mask(dContext, sdc,
                                                   viewMatrix, *shape, maskFilter,
                                                   unclippedDevShapeBounds, boundsForClip,
                                                   &maskRect, &maskKey);
        if (filteredMaskView) {
            if (draw_mask(sdc, clip, viewMatrix, maskRect, std::move(paint),
                          std::move(filteredMaskView))) {
                // This path is completely drawn
                return;
            }
            assert_alive(paint);
        }
    }
 
    // Either HW mask rendering failed or we're in a DDL recording thread
    filteredMaskView = sw_create_filtered_mask(rContext,
                                               viewMatrix, *shape, maskFilter,
                                               unclippedDevShapeBounds, boundsForClip,
                                               &maskRect, &maskKey);
    if (filteredMaskView) {
        if (draw_mask(sdc, clip, viewMatrix, maskRect, std::move(paint),
                      std::move(filteredMaskView))) {
            return;
        }
        assert_alive(paint);
    }
}

DrawShapeWithMaskFilter() [1/2]

void GrBlurUtils::DrawShapeWithMaskFilter	(	GrRecordingContext *	,
		skgpu::ganesh::SurfaceDrawContext *	,
		const GrClip *	,
		const GrStyledShape &	,
		GrPaint &&	,
		const SkMatrix &	viewMatrix,
		const SkMaskFilter *
	)

Draw a shape handling the mask filter. The mask filter is not optional. The GrPaint will be modified after return.

Definition at line 1546 of file GrBlurUtils.cpp.

                                                     {
    draw_shape_with_mask_filter(rContext, sdc, clip, std::move(paint),
                                viewMatrix, as_MFB(mf), shape);
}

DrawShapeWithMaskFilter() [2/2]

void GrBlurUtils::DrawShapeWithMaskFilter	(	GrRecordingContext *	,
		skgpu::ganesh::SurfaceDrawContext *	,
		const GrClip *	,
		const SkPaint &	,
		const SkMatrix &	,
		const GrStyledShape &
	)

Draw a shape handling the mask filter if present.

Definition at line 1557 of file GrBlurUtils.cpp.

                                                         {
    if (rContext->abandoned()) {
        return;
    }
 
    GrPaint grPaint;
    if (!SkPaintToGrPaint(rContext, sdc->colorInfo(), paint, ctm, sdc->surfaceProps(), &grPaint)) {
        return;
    }
 
    SkMaskFilterBase* mf = as_MFB(paint.getMaskFilter());
    if (mf && !GrFragmentProcessors::IsSupported(mf)) {
        // The MaskFilter wasn't already handled in SkPaintToGrPaint
        draw_shape_with_mask_filter(rContext, sdc, clip, std::move(grPaint), ctm, mf, shape);
    } else {
        sdc->drawShape(clip, std::move(grPaint), sdc->chooseAA(paint), ctm, GrStyledShape(shape));
    }
}

extract_draw_rect_from_data()

static SkIRect GrBlurUtils::extract_draw_rect_from_data ( SkData *  data, const SkIRect &  origDevBounds  )

static

Definition at line 151 of file GrBlurUtils.cpp.

                                                                                       {
    auto drawRectData = static_cast<const DrawRectData*>(data->data());
 
    return SkIRect::MakeXYWH(origDevBounds.fLeft + drawRectData->fOffset.fX,
                             origDevBounds.fTop + drawRectData->fOffset.fY,
                             drawRectData->fSize.fWidth,
                             drawRectData->fSize.fHeight);
}

fillin_view_on_gpu()

static bool GrBlurUtils::fillin_view_on_gpu ( GrDirectContext *  dContext, const GrSurfaceProxyView &  lazyView, GrThreadSafeCache::Trampoline *  trampoline, const SkRRect &  rrectToDraw, const SkISize &  dimensions, float  xformedSigma  )

static

Definition at line 737 of file GrBlurUtils.cpp.

                                                   {
    SkASSERT(!skgpu::BlurIsEffectivelyIdentity(xformedSigma));
 
    // We cache blur masks. Use default surface props here so we can use the same cached mask
    // regardless of the final dst surface.
    SkSurfaceProps defaultSurfaceProps;
 
    std::unique_ptr<skgpu::ganesh::SurfaceDrawContext> sdc =
            skgpu::ganesh::SurfaceDrawContext::MakeWithFallback(dContext,
                                                                GrColorType::kAlpha_8,
                                                                nullptr,
                                                                SkBackingFit::kExact,
                                                                dimensions,
                                                                defaultSurfaceProps,
                                                                1,
                                                                skgpu::Mipmapped::kNo,
                                                                GrProtected::kNo,
                                                                kBlurredRRectMaskOrigin);
    if (!sdc) {
        return false;
    }
 
    GrPaint paint;
 
    sdc->clear(SK_PMColor4fTRANSPARENT);
    sdc->drawRRect(nullptr,
                   std::move(paint),
                   GrAA::kYes,
                   SkMatrix::I(),
                   rrectToDraw,
                   GrStyle::SimpleFill());
 
    GrSurfaceProxyView srcView = sdc->readSurfaceView();
    SkASSERT(srcView.asTextureProxy());
    auto rtc2 = GaussianBlur(dContext,
                             std::move(srcView),
                             sdc->colorInfo().colorType(),
                             sdc->colorInfo().alphaType(),
                             nullptr,
                             SkIRect::MakeSize(dimensions),
                             SkIRect::MakeSize(dimensions),
                             xformedSigma,
                             xformedSigma,
                             SkTileMode::kClamp,
                             SkBackingFit::kExact);
    if (!rtc2 || !rtc2->readSurfaceView()) {
        return false;
    }
 
    auto view = rtc2->readSurfaceView();
    SkASSERT(view.swizzle() == lazyView.swizzle());
    SkASSERT(view.origin() == lazyView.origin());
    trampoline->fProxy = view.asTextureProxyRef();
 
    return true;
}

filter_mask()

static GrSurfaceProxyView GrBlurUtils::filter_mask ( GrRecordingContext *  context, const SkMaskFilterBase *  maskFilter, GrSurfaceProxyView  srcView, GrColorType  srcColorType, SkAlphaType  srcAlphaType, const SkMatrix &  ctm, const SkIRect &  maskRect  )

static

This function is used to implement filters that require an explicit src mask. It should only be called if can_filter_mask returned true and the maskRect param should be the output from that call. Implementations are free to get the GrContext from the src texture in order to create additional textures and perform multiple passes.

Definition at line 1228 of file GrBlurUtils.cpp.

                                                               {
    if (maskFilter->type() != SkMaskFilterBase::Type::kBlur) {
        return {};
    }
    auto bmf = static_cast<const SkBlurMaskFilterImpl*>(maskFilter);
    // 'maskRect' isn't snapped to the UL corner but the mask in 'src' is.
    const SkIRect clipRect = SkIRect::MakeWH(maskRect.width(), maskRect.height());
 
    SkScalar xformedSigma = bmf->computeXformedSigma(ctm);
 
    // If we're doing a normal blur, we can clobber the pathTexture in the
    // gaussianBlur.  Otherwise, we need to save it for later compositing.
    bool isNormalBlur = (kNormal_SkBlurStyle == bmf->blurStyle());
    auto srcBounds = SkIRect::MakeSize(srcView.proxy()->dimensions());
    auto surfaceDrawContext = GaussianBlur(context,
                                            srcView,
                                            srcColorType,
                                            srcAlphaType,
                                            nullptr,
                                            clipRect,
                                            srcBounds,
                                            xformedSigma,
                                            xformedSigma,
                                            SkTileMode::kClamp);
    if (!surfaceDrawContext || !surfaceDrawContext->asTextureProxy()) {
        return {};
    }
 
    if (!isNormalBlur) {
        GrPaint paint;
        // Blend pathTexture over blurTexture.
        paint.setCoverageFragmentProcessor(GrTextureEffect::Make(std::move(srcView), srcAlphaType));
        if (kInner_SkBlurStyle == bmf->blurStyle()) {
            // inner:  dst = dst * src
            paint.setCoverageSetOpXPFactory(SkRegion::kIntersect_Op);
        } else if (kSolid_SkBlurStyle == bmf->blurStyle()) {
            // solid:  dst = src + dst - src * dst
            //             = src + (1 - src) * dst
            paint.setCoverageSetOpXPFactory(SkRegion::kUnion_Op);
        } else if (kOuter_SkBlurStyle == bmf->blurStyle()) {
            // outer:  dst = dst * (1 - src)
            //             = 0 * src + (1 - src) * dst
            paint.setCoverageSetOpXPFactory(SkRegion::kDifference_Op);
        } else {
            paint.setCoverageSetOpXPFactory(SkRegion::kReplace_Op);
        }
 
        surfaceDrawContext->fillPixelsWithLocalMatrix(nullptr, std::move(paint), clipRect,
                                                      SkMatrix::I());
    }
 
    return surfaceDrawContext->readSurfaceView();
}

find_or_create_rrect_blur_mask_fp()

static std::unique_ptr< GrFragmentProcessor > GrBlurUtils::find_or_create_rrect_blur_mask_fp ( GrRecordingContext *  rContext, const SkRRect &  rrectToDraw, const SkISize &  dimensions, float  xformedSigma  )

static

Definition at line 819 of file GrBlurUtils.cpp.

                            {
    SkASSERT(!skgpu::BlurIsEffectivelyIdentity(xformedSigma));
    skgpu::UniqueKey key;
    make_blurred_rrect_key(&key, rrectToDraw, xformedSigma);
 
    auto threadSafeCache = rContext->priv().threadSafeCache();
 
    // It seems like we could omit this matrix and modify the shader code to not normalize
    // the coords used to sample the texture effect. However, the "proxyDims" value in the
    // shader is not always the actual the proxy dimensions. This is because 'dimensions' here
    // was computed using integer corner radii as determined in
    // SkComputeBlurredRRectParams whereas the shader code uses the float radius to compute
    // 'proxyDims'. Why it draws correctly with these unequal values is a mystery for the ages.
    auto m = SkMatrix::Scale(dimensions.width(), dimensions.height());
 
    GrSurfaceProxyView view;
 
    if (GrDirectContext* dContext = rContext->asDirectContext()) {
        // The gpu thread gets priority over the recording threads. If the gpu thread is first,
        // it crams a lazy proxy into the cache and then fills it in later.
        auto [lazyView, trampoline] = GrThreadSafeCache::CreateLazyView(dContext,
                                                                        GrColorType::kAlpha_8,
                                                                        dimensions,
                                                                        kBlurredRRectMaskOrigin,
                                                                        SkBackingFit::kExact);
        if (!lazyView) {
            return nullptr;
        }
 
        view = threadSafeCache->findOrAdd(key, lazyView);
        if (view != lazyView) {
            SkASSERT(view.asTextureProxy());
            SkASSERT(view.origin() == kBlurredRRectMaskOrigin);
            return GrTextureEffect::Make(std::move(view), kPremul_SkAlphaType, m);
        }
 
        if (!fillin_view_on_gpu(dContext,
                                lazyView,
                                trampoline.get(),
                                rrectToDraw,
                                dimensions,
                                xformedSigma)) {
            // In this case something has gone disastrously wrong so set up to drop the draw
            // that needed this resource and reduce future pollution of the cache.
            threadSafeCache->remove(key);
            return nullptr;
        }
    } else {
        view = threadSafeCache->find(key);
        if (view) {
            SkASSERT(view.asTextureProxy());
            SkASSERT(view.origin() == kBlurredRRectMaskOrigin);
            return GrTextureEffect::Make(std::move(view), kPremul_SkAlphaType, m);
        }
 
        view = create_mask_on_cpu(rContext, rrectToDraw, dimensions, xformedSigma);
        if (!view) {
            return nullptr;
        }
 
        view = threadSafeCache->add(key, view);
    }
 
    SkASSERT(view.asTextureProxy());
    SkASSERT(view.origin() == kBlurredRRectMaskOrigin);
    return GrTextureEffect::Make(std::move(view), kPremul_SkAlphaType, m);
}

GaussianBlur()

std::unique_ptr< skgpu::ganesh::SurfaceDrawContext > GrBlurUtils::GaussianBlur	(	GrRecordingContext *	,
		GrSurfaceProxyView	srcView,
		GrColorType	srcColorType,
		SkAlphaType	srcAlphaType,
		sk_sp< SkColorSpace >	srcColorSpace,
		SkIRect	dstBounds,
		SkIRect	srcBounds,
		float	sigmaX,
		float	sigmaY,
		SkTileMode	mode,
		SkBackingFit	fit = SkBackingFit::kApprox
	)

Applies a 2D Gaussian blur to a given texture. The blurred result is returned as a surfaceDrawContext in case the caller wishes to draw into the result. The GrSurfaceOrigin of the result will watch the GrSurfaceOrigin of srcView. The output color type, color space, and alpha type will be the same as the src.

Note: one of sigmaX and sigmaY should be non-zero!

Parameters

context	The GPU context
srcView	The source to be blurred.
srcColorType	The colorType of srcProxy
srcAlphaType	The alphaType of srcProxy
srcColorSpace	Color space of the source.
dstBounds	The destination bounds, relative to the source texture.
srcBounds	The source bounds, relative to the source texture's offset. No pixels will be sampled outside of this rectangle.
sigmaX	The blur's standard deviation in X.
sigmaY	The blur's standard deviation in Y.
tileMode	The mode to handle samples outside bounds.
fit	backing fit for the returned render target context

Returns

The surfaceDrawContext containing the blurred result.

Definition at line 2107 of file GrBlurUtils.cpp.

                                                                                  {
    SkASSERT(rContext);
    TRACE_EVENT2("skia.gpu", "GaussianBlur", "sigmaX", sigmaX, "sigmaY", sigmaY);
 
    if (!srcView.asTextureProxy()) {
        return nullptr;
    }
 
    int maxRenderTargetSize = rContext->priv().caps()->maxRenderTargetSize();
    if (dstBounds.width() > maxRenderTargetSize || dstBounds.height() > maxRenderTargetSize) {
        return nullptr;
    }
 
    int radiusX = skgpu::BlurSigmaRadius(sigmaX);
    int radiusY = skgpu::BlurSigmaRadius(sigmaY);
    // Attempt to reduce the srcBounds in order to detect that we can set the sigmas to zero or
    // to reduce the amount of work to rescale the source if sigmas are large. TODO: Could consider
    // how to minimize the required source bounds for repeat/mirror modes.
    if (mode == SkTileMode::kClamp || mode == SkTileMode::kDecal) {
        SkIRect reach = dstBounds.makeOutset(radiusX, radiusY);
        SkIRect intersection;
        if (!intersection.intersect(reach, srcBounds)) {
            if (mode == SkTileMode::kDecal) {
                return nullptr;
            } else {
                if (reach.fLeft >= srcBounds.fRight) {
                    srcBounds.fLeft = srcBounds.fRight - 1;
                } else if (reach.fRight <= srcBounds.fLeft) {
                    srcBounds.fRight = srcBounds.fLeft + 1;
                }
                if (reach.fTop >= srcBounds.fBottom) {
                    srcBounds.fTop = srcBounds.fBottom - 1;
                } else if (reach.fBottom <= srcBounds.fTop) {
                    srcBounds.fBottom = srcBounds.fTop + 1;
                }
            }
        } else {
            srcBounds = intersection;
        }
    }
 
    if (mode != SkTileMode::kDecal) {
        // All non-decal tile modes are equivalent for one pixel width/height src and amount to a
        // single color value repeated at each column/row. Applying the normalized kernel to that
        // column/row yields that same color. So no blurring is necessary.
        if (srcBounds.width() == 1) {
            sigmaX = 0.f;
            radiusX = 0;
        }
        if (srcBounds.height() == 1) {
            sigmaY = 0.f;
            radiusY = 0;
        }
    }
 
    // If we determined that there is no blurring necessary in either direction then just do a
    // a draw that applies the tile mode.
    if (!radiusX && !radiusY) {
        // Create the sdc with default SkSurfaceProps. Gaussian blurs will soon use a
        // SurfaceFillContext, at which point the SkSurfaceProps won't exist anymore.
        auto result =
                skgpu::ganesh::SurfaceDrawContext::Make(rContext,
                                                        srcColorType,
                                                        std::move(colorSpace),
                                                        fit,
                                                        dstBounds.size(),
                                                        SkSurfaceProps(),
                                                        /*label=*/"SurfaceDrawContext_GaussianBlur",
                                                        /* sampleCnt= */ 1,
                                                        skgpu::Mipmapped::kNo,
                                                        srcView.proxy()->isProtected(),
                                                        srcView.origin());
        if (!result) {
            return nullptr;
        }
        GrSamplerState sampler(SkTileModeToWrapMode(mode), GrSamplerState::Filter::kNearest);
        auto fp = GrTextureEffect::MakeSubset(std::move(srcView),
                                              srcAlphaType,
                                              SkMatrix::I(),
                                              sampler,
                                              SkRect::Make(srcBounds),
                                              SkRect::Make(dstBounds),
                                              *rContext->priv().caps());
        result->fillRectToRectWithFP(dstBounds, SkIRect::MakeSize(dstBounds.size()), std::move(fp));
        return result;
    }
 
    // Any sigma higher than the limit for the 1D linear-filtered Gaussian blur is downsampled. If
    // the sigma in X and Y just so happen to fit in the 2D limit, we'll use that. The 2D limit is
    // always less than the linear blur sigma limit.
    static constexpr float kMaxSigma = skgpu::kMaxLinearBlurSigma;
    if (sigmaX <= kMaxSigma && sigmaY <= kMaxSigma) {
        // 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.
        const int kernelSize = skgpu::BlurKernelWidth(radiusX) * skgpu::BlurKernelWidth(radiusY);
        if (radiusX > 0 && radiusY > 0 &&
            kernelSize <= skgpu::kMaxBlurSamples &&
            !rContext->priv().caps()->reducedShaderMode()) {
            // Apply the proxy offset to src bounds and offset directly
            return convolve_gaussian_2d(rContext,
                                        std::move(srcView),
                                        srcColorType,
                                        srcBounds,
                                        dstBounds,
                                        radiusX,
                                        radiusY,
                                        sigmaX,
                                        sigmaY,
                                        mode,
                                        std::move(colorSpace),
                                        fit);
        }
        // This will automatically degenerate into a single pass of X or Y if only one of the
        // radii are non-zero.
        SkASSERT(skgpu::BlurLinearKernelWidth(radiusX) <= skgpu::kMaxBlurSamples &&
                 skgpu::BlurLinearKernelWidth(radiusY) <= skgpu::kMaxBlurSamples);
        return two_pass_gaussian(rContext,
                                 std::move(srcView),
                                 srcColorType,
                                 srcAlphaType,
                                 std::move(colorSpace),
                                 srcBounds,
                                 dstBounds,
                                 sigmaX,
                                 sigmaY,
                                 radiusX,
                                 radiusY,
                                 mode,
                                 fit);
    }
 
    GrColorInfo colorInfo(srcColorType, srcAlphaType, colorSpace);
    auto srcCtx = rContext->priv().makeSC(srcView, colorInfo);
    SkASSERT(srcCtx);
 
#if defined(SK_USE_PADDED_BLUR_UPSCALE)
    // When we are in clamp mode any artifacts in the edge pixels due to downscaling may be
    // exacerbated because of the tile mode. The particularly egregious case is when the original
    // image has transparent black around the edges and the downscaling pulls in some non-zero
    // values from the interior. Ultimately it'd be better for performance if the calling code could
    // give us extra context around the blur to account for this. We don't currently have a good way
    // to communicate this up stack. So we leave a 1 pixel border around the rescaled src bounds.
    // We populate the top 1 pixel tall row of this border by rescaling the top row of the original
    // source bounds into it. Because this is only rescaling in x (i.e. rescaling a 1 pixel high
    // row into a shorter but still 1 pixel high row) we won't read any interior values. And similar
    // for the other three borders. We'll adjust the source/dest bounds rescaled blur so that this
    // border of extra pixels is used as the edge pixels for clamp mode but the dest bounds
    // corresponds only to the pixels inside the border (the normally rescaled pixels inside this
    // border).
    // Moreover, if we clamped the rescaled size to 1 column or row then we still have a sigma
    // that is greater than kMaxSigma. By using a pad and making the src 3 wide/tall instead of
    // 1 we can recurse again and do another downscale. Since mirror and repeat modes are trivial
    // for a single col/row we only add padding based on sigma exceeding kMaxSigma for decal.
    int padX = mode == SkTileMode::kClamp || (mode == SkTileMode::kDecal && sigmaX > kMaxSigma) ? 1
                                                                                                : 0;
    int padY = mode == SkTileMode::kClamp || (mode == SkTileMode::kDecal && sigmaY > kMaxSigma) ? 1
                                                                                                : 0;
#endif
 
    float scaleX = sigmaX > kMaxSigma ? kMaxSigma / sigmaX : 1.f;
    float scaleY = sigmaY > kMaxSigma ? kMaxSigma / sigmaY : 1.f;
    // We round down here so that when we recalculate sigmas we know they will be below
    // kMaxSigma (but clamp to 1 do we don't have an empty texture).
    SkISize rescaledSize = {std::max(sk_float_floor2int(srcBounds.width() * scaleX), 1),
                            std::max(sk_float_floor2int(srcBounds.height() * scaleY), 1)};
    // Compute the sigmas using the actual scale factors used once we integerized the
    // rescaledSize.
    scaleX = static_cast<float>(rescaledSize.width()) / srcBounds.width();
    scaleY = static_cast<float>(rescaledSize.height()) / srcBounds.height();
    sigmaX *= scaleX;
    sigmaY *= scaleY;
 
#if !defined(SK_USE_PADDED_BLUR_UPSCALE)
    // Historically, padX and padY were calculated after scaling sigmaX,Y, which meant that they
    // would never be greater than kMaxSigma. This causes pixel diffs so must be guarded along with
    // the rest of the padding dst behavior.
    int padX = mode == SkTileMode::kClamp || (mode == SkTileMode::kDecal && sigmaX > kMaxSigma) ? 1
                                                                                                : 0;
    int padY = mode == SkTileMode::kClamp || (mode == SkTileMode::kDecal && sigmaY > kMaxSigma) ? 1
                                                                                                : 0;
#endif
 
    // Create the sdc with default SkSurfaceProps. Gaussian blurs will soon use a
    // SurfaceFillContext, at which point the SkSurfaceProps won't exist anymore.
    auto rescaledSDC = skgpu::ganesh::SurfaceDrawContext::Make(
            srcCtx->recordingContext(),
            colorInfo.colorType(),
            colorInfo.refColorSpace(),
            SkBackingFit::kApprox,
            {rescaledSize.width() + 2 * padX, rescaledSize.height() + 2 * padY},
            SkSurfaceProps(),
            /*label=*/"RescaledSurfaceDrawContext",
            /* sampleCnt= */ 1,
            skgpu::Mipmapped::kNo,
            srcCtx->asSurfaceProxy()->isProtected(),
            srcCtx->origin());
    if (!rescaledSDC) {
        return nullptr;
    }
    if ((padX || padY) && mode == SkTileMode::kDecal) {
        rescaledSDC->clear(SkPMColor4f{0, 0, 0, 0});
    }
    if (!srcCtx->rescaleInto(rescaledSDC.get(),
                             SkIRect::MakeSize(rescaledSize).makeOffset(padX, padY),
                             srcBounds,
                             SkSurface::RescaleGamma::kSrc,
                             SkSurface::RescaleMode::kRepeatedLinear)) {
        return nullptr;
    }
    if (mode == SkTileMode::kClamp) {
        SkASSERT(padX == 1 && padY == 1);
        // Rather than run a potentially multi-pass rescaler on single rows/columns we just do a
        // single bilerp draw. If we find this quality unacceptable we should think more about how
        // to rescale these with better quality but without 4 separate multi-pass downscales.
        auto cheapDownscale = [&](SkIRect dstRect, SkIRect srcRect) {
            rescaledSDC->drawTexture(nullptr,
                                     srcCtx->readSurfaceView(),
                                     srcAlphaType,
                                     GrSamplerState::Filter::kLinear,
                                     GrSamplerState::MipmapMode::kNone,
                                     SkBlendMode::kSrc,
                                     SK_PMColor4fWHITE,
                                     SkRect::Make(srcRect),
                                     SkRect::Make(dstRect),
                                     GrQuadAAFlags::kNone,
                                     SkCanvas::SrcRectConstraint::kFast_SrcRectConstraint,
                                     SkMatrix::I(),
                                     nullptr);
        };
        auto [dw, dh] = rescaledSize;
        // The are the src rows and columns from the source that we will scale into the dst padding.
        float sLCol = srcBounds.left();
        float sTRow = srcBounds.top();
        float sRCol = srcBounds.right() - 1;
        float sBRow = srcBounds.bottom() - 1;
 
        int sx = srcBounds.left();
        int sy = srcBounds.top();
        int sw = srcBounds.width();
        int sh = srcBounds.height();
 
        // Downscale the edges from the original source. These draws should batch together (and with
        // the above interior rescaling when it is a single pass).
        cheapDownscale(SkIRect::MakeXYWH(0, 1, 1, dh), SkIRect::MakeXYWH(sLCol, sy, 1, sh));
        cheapDownscale(SkIRect::MakeXYWH(1, 0, dw, 1), SkIRect::MakeXYWH(sx, sTRow, sw, 1));
        cheapDownscale(SkIRect::MakeXYWH(dw + 1, 1, 1, dh), SkIRect::MakeXYWH(sRCol, sy, 1, sh));
        cheapDownscale(SkIRect::MakeXYWH(1, dh + 1, dw, 1), SkIRect::MakeXYWH(sx, sBRow, sw, 1));
 
        // Copy the corners from the original source. These would batch with the edges except that
        // at time of writing we recognize these can use kNearest and downgrade the filter. So they
        // batch with each other but not the edge draws.
        cheapDownscale(SkIRect::MakeXYWH(0, 0, 1, 1), SkIRect::MakeXYWH(sLCol, sTRow, 1, 1));
        cheapDownscale(SkIRect::MakeXYWH(dw + 1, 0, 1, 1), SkIRect::MakeXYWH(sRCol, sTRow, 1, 1));
        cheapDownscale(SkIRect::MakeXYWH(dw + 1, dh + 1, 1, 1),
                       SkIRect::MakeXYWH(sRCol, sBRow, 1, 1));
        cheapDownscale(SkIRect::MakeXYWH(0, dh + 1, 1, 1), SkIRect::MakeXYWH(sLCol, sBRow, 1, 1));
    }
    srcView = rescaledSDC->readSurfaceView();
    // Drop the contexts so we don't hold the proxies longer than necessary.
    rescaledSDC.reset();
    srcCtx.reset();
 
    // Compute the dst bounds in the scaled down space. First move the origin to be at the top
    // left since we trimmed off everything above and to the left of the original src bounds during
    // the rescale.
    SkRect scaledDstBounds = SkRect::Make(dstBounds.makeOffset(-srcBounds.topLeft()));
    scaledDstBounds.fLeft *= scaleX;
    scaledDstBounds.fTop *= scaleY;
    scaledDstBounds.fRight *= scaleX;
    scaledDstBounds.fBottom *= scaleY;
    // Account for padding in our rescaled src, if any.
    scaledDstBounds.offset(padX, padY);
    // Turn the scaled down dst bounds into an integer pixel rect, adding 1px of padding to help
    // with boundary sampling during re-expansion when there are extreme scale factors. This is
    // particularly important when the blurs extend across Chrome raster tiles; w/o it the re-expand
    // produces visible seams: crbug.com/1500021.
#if defined(SK_USE_PADDED_BLUR_UPSCALE)
    static constexpr int kDstPadding = 1;
#else
    static constexpr int kDstPadding = 0;
#endif
    auto scaledDstBoundsI = scaledDstBounds.roundOut();
    scaledDstBoundsI.outset(kDstPadding, kDstPadding);
 
    SkIRect scaledSrcBounds = SkIRect::MakeSize(srcView.dimensions());
    auto sdc = GaussianBlur(rContext,
                            std::move(srcView),
                            srcColorType,
                            srcAlphaType,
                            colorSpace,
                            scaledDstBoundsI,
                            scaledSrcBounds,
                            sigmaX,
                            sigmaY,
                            mode,
                            fit);
    if (!sdc) {
        return nullptr;
    }
 
    SkASSERT(sdc->width() == scaledDstBoundsI.width() &&
             sdc->height() == scaledDstBoundsI.height());
    // We rounded out the integer scaled dst bounds. Select the fractional dst bounds from the
    // integer dimension blurred result when we scale back up. This also accounts for the padding
    // added to 'scaledDstBoundsI' when sampling from the blurred result.
    scaledDstBounds.offset(-scaledDstBoundsI.left(), -scaledDstBoundsI.top());
    return reexpand(rContext,
                    std::move(sdc),
                    scaledDstBounds,
                    dstBounds.size(),
                    std::move(colorSpace),
                    fit);
}

get_shape_and_clip_bounds()

static bool GrBlurUtils::get_shape_and_clip_bounds ( skgpu::ganesh::SurfaceDrawContext *  sdc, const GrClip *  clip, const GrStyledShape &  shape, const SkMatrix &  matrix, SkIRect *  unclippedDevShapeBounds, SkIRect *  devClipBounds  )

static

Definition at line 331 of file GrBlurUtils.cpp.

                                                              {
    // compute bounds as intersection of rt size, clip, and path
    *devClipBounds = clip ? clip->getConservativeBounds()
                          : SkIRect::MakeWH(sdc->width(), sdc->height());
 
    if (!get_unclipped_shape_dev_bounds(shape, matrix, unclippedDevShapeBounds)) {
        *unclippedDevShapeBounds = SkIRect::MakeEmpty();
        return false;
    }
 
    return true;
}

get_unclipped_shape_dev_bounds()

static bool GrBlurUtils::get_unclipped_shape_dev_bounds ( const GrStyledShape &  shape, const SkMatrix &  matrix, SkIRect *  devBounds  )

static

Definition at line 299 of file GrBlurUtils.cpp.

                                                               {
    SkRect shapeDevBounds;
    if (shape.inverseFilled()) {
        shapeDevBounds = {SK_ScalarNegativeInfinity, SK_ScalarNegativeInfinity,
                          SK_ScalarInfinity, SK_ScalarInfinity};
    } else {
        SkRect shapeBounds = shape.styledBounds();
        if (shapeBounds.isEmpty()) {
            return false;
        }
        matrix.mapRect(&shapeDevBounds, shapeBounds);
    }
    // Even though these are "unclipped" bounds we still clip to the int32_t range.
    // This is the largest int32_t that is representable exactly as a float. The next 63 larger ints
    // would round down to this value when cast to a float, but who really cares.
    // INT32_MIN is exactly representable.
    static constexpr int32_t kMaxInt = 2147483520;
    if (!shapeDevBounds.intersect(SkRect::MakeLTRB(INT32_MIN, INT32_MIN, kMaxInt, kMaxInt))) {
        return false;
    }
    // Make sure that the resulting SkIRect can have representable width and height
    if (SkScalarRoundToInt(shapeDevBounds.width()) > kMaxInt ||
        SkScalarRoundToInt(shapeDevBounds.height()) > kMaxInt) {
        return false;
    }
    shapeDevBounds.roundOut(devBounds);
    return true;
}

hw_create_filtered_mask()

static GrSurfaceProxyView GrBlurUtils::hw_create_filtered_mask ( GrDirectContext *  dContext, skgpu::ganesh::SurfaceDrawContext *  sdc, const SkMatrix &  viewMatrix, const GrStyledShape &  shape, const SkMaskFilterBase *  filter, const SkIRect &  unclippedDevShapeBounds, const SkIRect &  clipBounds, SkIRect *  maskRect, skgpu::UniqueKey *  key  )

static

Definition at line 1288 of file GrBlurUtils.cpp.

                                                                       {
    if (!can_filter_mask(filter, shape, unclippedDevShapeBounds, clipBounds, viewMatrix,
                         maskRect)) {
        return {};
    }
 
    if (clip_bounds_quick_reject(clipBounds, *maskRect)) {
        // clipped out
        return {};
    }
 
    auto threadSafeCache = dContext->priv().threadSafeCache();
 
    GrSurfaceProxyView lazyView;
    sk_sp<GrThreadSafeCache::Trampoline> trampoline;
 
    if (key->isValid()) {
        // In this case, we want GPU-filtered masks to have priority over SW-generated ones so
        // we pre-emptively add a lazy-view to the cache and fill it in later.
        std::tie(lazyView, trampoline) = GrThreadSafeCache::CreateLazyView(
                dContext, GrColorType::kAlpha_8, maskRect->size(),
                kMaskOrigin, SkBackingFit::kApprox);
        if (!lazyView) {
            return {}; // fall back to a SW-created mask - 'create_mask_GPU' probably won't succeed
        }
 
        key->setCustomData(create_data(*maskRect, unclippedDevShapeBounds));
        auto [cachedView, data] = threadSafeCache->findOrAddWithData(*key, lazyView);
        if (cachedView != lazyView) {
            // In this case, the gpu-thread lost out to a recording thread - use its result.
            SkASSERT(data);
            SkASSERT(cachedView.asTextureProxy());
            SkASSERT(cachedView.origin() == kMaskOrigin);
 
            *maskRect = extract_draw_rect_from_data(data.get(), unclippedDevShapeBounds);
            return cachedView;
        }
    }
 
    std::unique_ptr<skgpu::ganesh::SurfaceDrawContext> maskSDC(
            create_mask_GPU(dContext, *maskRect, viewMatrix, shape, sdc->numSamples()));
    if (!maskSDC) {
        if (key->isValid()) {
            // It is very unlikely that 'create_mask_GPU' will fail after 'CreateLazyView'
            // succeeded but, if it does, remove the lazy-view from the cache and fallback to
            // a SW-created mask. Note that any recording threads that glommed onto the
            // lazy-view will have to, later, drop those draws.
            threadSafeCache->remove(*key);
        }
        return {};
    }
 
    auto filteredMaskView = filter_mask(dContext, filter,
                                                  maskSDC->readSurfaceView(),
                                                  maskSDC->colorInfo().colorType(),
                                                  maskSDC->colorInfo().alphaType(),
                                                  viewMatrix,
                                                  *maskRect);
    if (!filteredMaskView) {
        if (key->isValid()) {
            // Remove the lazy-view from the cache and fallback to a SW-created mask. Note that
            // any recording threads that glommed onto the lazy-view will have to, later, drop
            // those draws.
            threadSafeCache->remove(*key);
        }
        return {};
    }
 
    if (key->isValid()) {
        SkASSERT(filteredMaskView.dimensions() == lazyView.dimensions());
        SkASSERT(filteredMaskView.swizzle() == lazyView.swizzle());
        SkASSERT(filteredMaskView.origin() == lazyView.origin());
 
        trampoline->fProxy = filteredMaskView.asTextureProxyRef();
        return lazyView;
    }
 
    return filteredMaskView;
}

make_blurred_rrect_key()

static void GrBlurUtils::make_blurred_rrect_key ( skgpu::UniqueKey *  key, const SkRRect &  rrectToDraw, float  xformedSigma  )

static

Definition at line 715 of file GrBlurUtils.cpp.

                                                       {
    SkASSERT(!skgpu::BlurIsEffectivelyIdentity(xformedSigma));
    static const skgpu::UniqueKey::Domain kDomain = skgpu::UniqueKey::GenerateDomain();
 
    skgpu::UniqueKey::Builder builder(key, kDomain, 9, "RoundRect Blur Mask");
    builder[0] = SkScalarCeilToInt(xformedSigma - 1 / 6.0f);
 
    int index = 1;
    // TODO: this is overkill for _simple_ circular rrects
    for (auto c : {SkRRect::kUpperLeft_Corner,
                   SkRRect::kUpperRight_Corner,
                   SkRRect::kLowerRight_Corner,
                   SkRRect::kLowerLeft_Corner}) {
        SkASSERT(SkScalarIsInt(rrectToDraw.radii(c).fX) && SkScalarIsInt(rrectToDraw.radii(c).fY));
        builder[index++] = SkScalarCeilToInt(rrectToDraw.radii(c).fX);
        builder[index++] = SkScalarCeilToInt(rrectToDraw.radii(c).fY);
    }
    builder.finish();
}

make_circle_blur()

static std::unique_ptr< GrFragmentProcessor > GrBlurUtils::make_circle_blur ( GrRecordingContext *  context, const SkRect &  circle, float  sigma  )

static

Definition at line 495 of file GrBlurUtils.cpp.

                                                                          {
    if (skgpu::BlurIsEffectivelyIdentity(sigma)) {
        return nullptr;
    }
 
    float solidRadius;
    float textureRadius;
    std::unique_ptr<GrFragmentProcessor> profile =
            create_profile_effect(context, circle, sigma, &solidRadius, &textureRadius);
    if (!profile) {
        return nullptr;
    }
 
    static const SkRuntimeEffect* effect = SkMakeRuntimeEffect(SkRuntimeEffect::MakeForShader,
        "uniform shader blurProfile;"
        "uniform half4 circleData;"
 
        "half4 main(float2 xy) {"
            // We just want to compute "(length(vec) - circleData.z + 0.5) * circleData.w" but need
            // to rearrange to avoid passing large values to length() that would overflow.
            "half2 vec = half2((sk_FragCoord.xy - circleData.xy) * circleData.w);"
            "half dist = length(vec) + (0.5 - circleData.z) * circleData.w;"
            "return blurProfile.eval(half2(dist, 0.5)).aaaa;"
        "}"
    );
 
    SkV4 circleData = {circle.centerX(), circle.centerY(), solidRadius, 1.f / textureRadius};
    auto circleBlurFP = GrSkSLFP::Make(effect, "CircleBlur", /*inputFP=*/nullptr,
                                       GrSkSLFP::OptFlags::kCompatibleWithCoverageAsAlpha,
                                       "blurProfile", GrSkSLFP::IgnoreOptFlags(std::move(profile)),
                                       "circleData", circleData);
    // Modulate blur with the input color.
    return GrBlendFragmentProcessor::Make<SkBlendMode::kModulate>(std::move(circleBlurFP),
                                                                  /*dst=*/nullptr);
}

make_rect_blur()

static std::unique_ptr< GrFragmentProcessor > GrBlurUtils::make_rect_blur ( GrRecordingContext *  context, const GrShaderCaps &  caps, const SkRect &  srcRect, const SkMatrix &  viewMatrix, float  transformedSigma  )

static

Definition at line 577 of file GrBlurUtils.cpp.

                                                                                   {
    SkASSERT(viewMatrix.preservesRightAngles());
    SkASSERT(srcRect.isSorted());
 
    if (skgpu::BlurIsEffectivelyIdentity(transformedSigma)) {
        // No need to blur the rect
        return nullptr;
    }
 
    SkMatrix invM;
    SkRect rect;
    if (viewMatrix.rectStaysRect()) {
        invM = SkMatrix::I();
        // We can do everything in device space when the src rect projects to a rect in device space
        SkAssertResult(viewMatrix.mapRect(&rect, srcRect));
    } else {
        // The view matrix may scale, perhaps anisotropically. But we want to apply our device space
        // "transformedSigma" to the delta of frag coord from the rect edges. Factor out the scaling
        // to define a space that is purely rotation/translation from device space (and scale from
        // src space) We'll meet in the middle: pre-scale the src rect to be in this space and then
        // apply the inverse of the rotation/translation portion to the frag coord.
        SkMatrix m;
        SkSize scale;
        if (!viewMatrix.decomposeScale(&scale, &m)) {
            return nullptr;
        }
        if (!m.invert(&invM)) {
            return nullptr;
        }
        rect = {srcRect.left() * scale.width(),
                srcRect.top() * scale.height(),
                srcRect.right() * scale.width(),
                srcRect.bottom() * scale.height()};
    }
 
    if (!caps.fFloatIs32Bits) {
        // We promote the math that gets us into the Gaussian space to full float when the rect
        // coords are large. If we don't have full float then fail. We could probably clip the rect
        // to an outset device bounds instead.
        if (SkScalarAbs(rect.fLeft) > 16000.f || SkScalarAbs(rect.fTop) > 16000.f ||
            SkScalarAbs(rect.fRight) > 16000.f || SkScalarAbs(rect.fBottom) > 16000.f) {
            return nullptr;
        }
    }
 
    const float sixSigma = 6 * transformedSigma;
    std::unique_ptr<GrFragmentProcessor> integral = make_rect_integral_fp(context, sixSigma);
    if (!integral) {
        return nullptr;
    }
 
    // In the fast variant we think of the midpoint of the integral texture as aligning with the
    // closest rect edge both in x and y. To simplify texture coord calculation we inset the rect so
    // that the edge of the inset rect corresponds to t = 0 in the texture. It actually simplifies
    // things a bit in the !isFast case, too.
    float threeSigma = sixSigma / 2;
    SkRect insetRect = {rect.left() + threeSigma,
                        rect.top() + threeSigma,
                        rect.right() - threeSigma,
                        rect.bottom() - threeSigma};
 
    // In our fast variant we find the nearest horizontal and vertical edges and for each do a
    // lookup in the integral texture for each and multiply them. When the rect is less than 6 sigma
    // wide then things aren't so simple and we have to consider both the left and right edge of the
    // rectangle (and similar in y).
    bool isFast = insetRect.isSorted();
 
    static const SkRuntimeEffect* effect = SkMakeRuntimeEffect(SkRuntimeEffect::MakeForShader,
        // Effect that is a LUT for integral of normal distribution. The value at x:[0,6*sigma] is
        // the integral from -inf to (3*sigma - x). I.e. x is mapped from [0, 6*sigma] to
        // [3*sigma to -3*sigma]. The flip saves a reversal in the shader.
        "uniform shader integral;"
 
        "uniform float4 rect;"
        "uniform int isFast;"  // specialized
 
        "half4 main(float2 pos) {"
            "half xCoverage, yCoverage;"
            "if (bool(isFast)) {"
                // Get the smaller of the signed distance from the frag coord to the left and right
                // edges and similar for y.
                // The integral texture goes "backwards" (from 3*sigma to -3*sigma), So, the below
                // computations align the left edge of the integral texture with the inset rect's
                // edge extending outward 6 * sigma from the inset rect.
                "half2 xy = max(half2(rect.LT - pos), half2(pos - rect.RB));"
                "xCoverage = integral.eval(half2(xy.x, 0.5)).a;"
                "yCoverage = integral.eval(half2(xy.y, 0.5)).a;"
            "} else {"
                // We just consider just the x direction here. In practice we compute x and y
                // separately and multiply them together.
                // We define our coord system so that the point at which we're evaluating a kernel
                // defined by the normal distribution (K) at 0. In this coord system let L be left
                // edge and R be the right edge of the rectangle.
                // We can calculate C by integrating K with the half infinite ranges outside the
                // L to R range and subtracting from 1:
                //   C = 1 - <integral of K from from -inf to  L> - <integral of K from R to inf>
                // K is symmetric about x=0 so:
                //   C = 1 - <integral of K from from -inf to  L> - <integral of K from -inf to -R>
 
                // The integral texture goes "backwards" (from 3*sigma to -3*sigma) which is
                // factored in to the below calculations.
                // Also, our rect uniform was pre-inset by 3 sigma from the actual rect being
                // blurred, also factored in.
                "half4 rect = half4(half2(rect.LT - pos), half2(pos - rect.RB));"
                "xCoverage = 1 - integral.eval(half2(rect.L, 0.5)).a"
                              "- integral.eval(half2(rect.R, 0.5)).a;"
                "yCoverage = 1 - integral.eval(half2(rect.T, 0.5)).a"
                              "- integral.eval(half2(rect.B, 0.5)).a;"
            "}"
            "return half4(xCoverage * yCoverage);"
        "}"
    );
 
    std::unique_ptr<GrFragmentProcessor> fp =
            GrSkSLFP::Make(effect, "RectBlur", /*inputFP=*/nullptr,
                           GrSkSLFP::OptFlags::kCompatibleWithCoverageAsAlpha,
                           "integral", GrSkSLFP::IgnoreOptFlags(std::move(integral)),
                           "rect", insetRect,
                           "isFast", GrSkSLFP::Specialize<int>(isFast));
    // Modulate blur with the input color.
    fp = GrBlendFragmentProcessor::Make<SkBlendMode::kModulate>(std::move(fp),
                                                                /*dst=*/nullptr);
    if (!invM.isIdentity()) {
        fp = GrMatrixEffect::Make(invM, std::move(fp));
    }
    return GrFragmentProcessor::DeviceSpace(std::move(fp));
}

make_rect_integral_fp()

static std::unique_ptr< GrFragmentProcessor > GrBlurUtils::make_rect_integral_fp ( GrRecordingContext *  rContext, float  sixSigma  )

static

Definition at line 537 of file GrBlurUtils.cpp.

                                                                                  {
    SkASSERT(!skgpu::BlurIsEffectivelyIdentity(sixSigma / 6.f));
    auto threadSafeCache = rContext->priv().threadSafeCache();
 
    int width = skgpu::ComputeIntegralTableWidth(sixSigma);
 
    static const skgpu::UniqueKey::Domain kDomain = skgpu::UniqueKey::GenerateDomain();
    skgpu::UniqueKey key;
    skgpu::UniqueKey::Builder builder(&key, kDomain, 1, "Rect Blur Mask");
    builder[0] = width;
    builder.finish();
 
    SkMatrix m = SkMatrix::Scale(width / sixSigma, 1.f);
 
    GrSurfaceProxyView view = threadSafeCache->find(key);
 
    if (view) {
        SkASSERT(view.origin() == kTopLeft_GrSurfaceOrigin);
        return GrTextureEffect::Make(
                std::move(view), kPremul_SkAlphaType, m, GrSamplerState::Filter::kLinear);
    }
 
    SkBitmap bitmap = skgpu::CreateIntegralTable(width);
    if (bitmap.empty()) {
        return {};
    }
 
    view = std::get<0>(GrMakeUncachedBitmapProxyView(rContext, bitmap));
    if (!view) {
        return {};
    }
 
    view = threadSafeCache->add(key, view);
 
    SkASSERT(view.origin() == kTopLeft_GrSurfaceOrigin);
    return GrTextureEffect::Make(
            std::move(view), kPremul_SkAlphaType, m, GrSamplerState::Filter::kLinear);
}

make_rrect_blur()

static std::unique_ptr< GrFragmentProcessor > GrBlurUtils::make_rrect_blur ( GrRecordingContext *  context, float  sigma, float  xformedSigma, const SkRRect &  srcRRect, const SkRRect &  devRRect  )

static

Definition at line 891 of file GrBlurUtils.cpp.

                                                                                     {
    SkASSERTF(!SkRRectPriv::IsCircle(devRRect),
              "Unexpected circle. %d\n\t%s\n\t%s",
              SkRRectPriv::IsCircle(srcRRect),
              srcRRect.dumpToString(true).c_str(),
              devRRect.dumpToString(true).c_str());
    SkASSERTF(!devRRect.isRect(),
              "Unexpected rect. %d\n\t%s\n\t%s",
              srcRRect.isRect(),
              srcRRect.dumpToString(true).c_str(),
              devRRect.dumpToString(true).c_str());
 
    // TODO: loosen this up
    if (!SkRRectPriv::IsSimpleCircular(devRRect)) {
        return nullptr;
    }
 
    if (skgpu::BlurIsEffectivelyIdentity(xformedSigma)) {
        return nullptr;
    }
 
    // Make sure we can successfully ninepatch this rrect -- the blur sigma has to be sufficiently
    // small relative to both the size of the corner radius and the width (and height) of the rrect.
    SkRRect rrectToDraw;
    SkISize dimensions;
    SkScalar ignored[kBlurRRectMaxDivisions];
 
    bool ninePatchable = ComputeBlurredRRectParams(srcRRect,
                                                   devRRect,
                                                   sigma,
                                                   xformedSigma,
                                                   &rrectToDraw,
                                                   &dimensions,
                                                   ignored,
                                                   ignored,
                                                   ignored,
                                                   ignored);
    if (!ninePatchable) {
        return nullptr;
    }
 
    std::unique_ptr<GrFragmentProcessor> maskFP =
            find_or_create_rrect_blur_mask_fp(context, rrectToDraw, dimensions, xformedSigma);
    if (!maskFP) {
        return nullptr;
    }
 
    static const SkRuntimeEffect* effect = SkMakeRuntimeEffect(SkRuntimeEffect::MakeForShader,
        "uniform shader ninePatchFP;"
 
        "uniform half cornerRadius;"
        "uniform float4 proxyRect;"
        "uniform half blurRadius;"
 
        "half4 main(float2 xy) {"
            // Warp the fragment position to the appropriate part of the 9-patch blur texture by
            // snipping out the middle section of the proxy rect.
            "float2 translatedFragPosFloat = sk_FragCoord.xy - proxyRect.LT;"
            "float2 proxyCenter = (proxyRect.RB - proxyRect.LT) * 0.5;"
            "half edgeSize = 2.0 * blurRadius + cornerRadius + 0.5;"
 
            // Position the fragment so that (0, 0) marks the center of the proxy rectangle.
            // Negative coordinates are on the left/top side and positive numbers are on the
            // right/bottom.
            "translatedFragPosFloat -= proxyCenter;"
 
            // Temporarily strip off the fragment's sign. x/y are now strictly increasing as we
            // move away from the center.
            "half2 fragDirection = half2(sign(translatedFragPosFloat));"
            "translatedFragPosFloat = abs(translatedFragPosFloat);"
 
            // Our goal is to snip out the "middle section" of the proxy rect (everything but the
            // edge). We've repositioned our fragment position so that (0, 0) is the centerpoint
            // and x/y are always positive, so we can subtract here and interpret negative results
            // as being within the middle section.
            "half2 translatedFragPosHalf = half2(translatedFragPosFloat - (proxyCenter - edgeSize));"
 
            // Remove the middle section by clamping to zero.
            "translatedFragPosHalf = max(translatedFragPosHalf, 0);"
 
            // Reapply the fragment's sign, so that negative coordinates once again mean left/top
            // side and positive means bottom/right side.
            "translatedFragPosHalf *= fragDirection;"
 
            // Offset the fragment so that (0, 0) marks the upper-left again, instead of the center
            // point.
            "translatedFragPosHalf += half2(edgeSize);"
 
            "half2 proxyDims = half2(2.0 * edgeSize);"
            "half2 texCoord = translatedFragPosHalf / proxyDims;"
 
            "return ninePatchFP.eval(texCoord).aaaa;"
        "}"
    );
 
    float cornerRadius = SkRRectPriv::GetSimpleRadii(devRRect).fX;
    float blurRadius = 3.f * SkScalarCeilToScalar(xformedSigma - 1 / 6.0f);
    SkRect proxyRect = devRRect.getBounds().makeOutset(blurRadius, blurRadius);
 
    auto rrectBlurFP = GrSkSLFP::Make(effect, "RRectBlur", /*inputFP=*/nullptr,
                                      GrSkSLFP::OptFlags::kCompatibleWithCoverageAsAlpha,
                                      "ninePatchFP", GrSkSLFP::IgnoreOptFlags(std::move(maskFP)),
                                      "cornerRadius", cornerRadius,
                                      "proxyRect", proxyRect,
                                      "blurRadius", blurRadius);
    // Modulate blur with the input color.
    return GrBlendFragmentProcessor::Make<SkBlendMode::kModulate>(std::move(rrectBlurFP),
                                                                  /*dst=*/nullptr);
}

mask_release_proc()

static void GrBlurUtils::mask_release_proc ( void *  addr, void *    )

static

Definition at line 131 of file GrBlurUtils.cpp.

                                                   {
    SkMaskBuilder::FreeImage(addr);
}

reexpand()

static std::unique_ptr< skgpu::ganesh::SurfaceDrawContext > GrBlurUtils::reexpand ( GrRecordingContext *  rContext, std::unique_ptr< skgpu::ganesh::SurfaceContext >  src, const SkRect &  srcBounds, SkISize  dstSize, sk_sp< SkColorSpace >  colorSpace, SkBackingFit  fit  )

static

Definition at line 1919 of file GrBlurUtils.cpp.

                          {
    GrSurfaceProxyView srcView = src->readSurfaceView();
    if (!srcView.asTextureProxy()) {
        return nullptr;
    }
 
    GrColorType srcColorType = src->colorInfo().colorType();
    SkAlphaType srcAlphaType = src->colorInfo().alphaType();
 
#if defined(SK_USE_PADDED_BLUR_UPSCALE)
    // The blur output completely filled the src SurfaceContext, so that is our subset boundary,
    // ensuring we don't access undefined pixels in the approx-fit backing texture.
    SkRect srcContent = SkRect::MakeIWH(src->width(), src->height());
#endif
 
    src.reset();  // no longer needed
 
    // Create the sdc with default SkSurfaceProps. Gaussian blurs will soon use a
    // SurfaceFillContext, at which point the SkSurfaceProps won't exist anymore.
    auto dstSDC = skgpu::ganesh::SurfaceDrawContext::Make(rContext,
                                                          srcColorType,
                                                          std::move(colorSpace),
                                                          fit,
                                                          dstSize,
                                                          SkSurfaceProps(),
                                                          /*label=*/"SurfaceDrawContext_Reexpand",
                                                          /* sampleCnt= */ 1,
                                                          skgpu::Mipmapped::kNo,
                                                          srcView.proxy()->isProtected(),
                                                          srcView.origin());
    if (!dstSDC) {
        return nullptr;
    }
 
    GrPaint paint;
    auto fp = GrTextureEffect::MakeSubset(std::move(srcView),
                                          srcAlphaType,
                                          SkMatrix::I(),
                                          GrSamplerState::Filter::kLinear,
#if defined(SK_USE_PADDED_BLUR_UPSCALE)
                                          srcContent,
#else
                                          srcBounds,
                                          srcBounds,
#endif
                                          *rContext->priv().caps());
    paint.setColorFragmentProcessor(std::move(fp));
    paint.setPorterDuffXPFactory(SkBlendMode::kSrc);
 
    dstSDC->fillRectToRect(
            nullptr, std::move(paint), GrAA::kNo, SkMatrix::I(), SkRect::Make(dstSize), srcBounds);
 
    return dstSDC;
}

sw_create_filtered_mask()

static GrSurfaceProxyView GrBlurUtils::sw_create_filtered_mask ( GrRecordingContext *  rContext, const SkMatrix &  viewMatrix, const GrStyledShape &  shape, const SkMaskFilter *  filter, const SkIRect &  unclippedDevShapeBounds, const SkIRect &  clipBounds, SkIRect *  drawRect, skgpu::UniqueKey *  key  )

static

Definition at line 160 of file GrBlurUtils.cpp.

                                                                       {
    SkASSERT(filter);
    SkASSERT(!shape.style().applies());
 
    auto threadSafeCache = rContext->priv().threadSafeCache();
 
    GrSurfaceProxyView filteredMaskView;
    sk_sp<SkData> data;
 
    if (key->isValid()) {
        std::tie(filteredMaskView, data) = threadSafeCache->findWithData(*key);
    }
 
    if (filteredMaskView) {
        SkASSERT(data);
        SkASSERT(kMaskOrigin == filteredMaskView.origin());
 
        *drawRect = extract_draw_rect_from_data(data.get(), unclippedDevShapeBounds);
    } else {
        SkStrokeRec::InitStyle fillOrHairline = shape.style().isSimpleHairline()
                                                        ? SkStrokeRec::kHairline_InitStyle
                                                        : SkStrokeRec::kFill_InitStyle;
 
        // TODO: it seems like we could create an SkDraw here and set its fMatrix field rather
        // than explicitly transforming the path to device space.
        SkPath devPath;
 
        shape.asPath(&devPath);
 
        devPath.transform(viewMatrix);
 
        SkMaskBuilder srcM, dstM;
        if (!SkDraw::DrawToMask(devPath, clipBounds, filter, &viewMatrix, &srcM,
                                SkMaskBuilder::kComputeBoundsAndRenderImage_CreateMode,
                                fillOrHairline)) {
            return {};
        }
        SkAutoMaskFreeImage autoSrc(srcM.image());
 
        SkASSERT(SkMask::kA8_Format == srcM.fFormat);
 
        if (!as_MFB(filter)->filterMask(&dstM, srcM, viewMatrix, nullptr)) {
            return {};
        }
        // this will free-up dstM when we're done (allocated in filterMask())
        SkAutoMaskFreeImage autoDst(dstM.image());
 
        if (clip_bounds_quick_reject(clipBounds, dstM.fBounds)) {
            return {};
        }
 
        // we now have a device-aligned 8bit mask in dstM, ready to be drawn using
        // the current clip (and identity matrix) and GrPaint settings
        SkBitmap bm;
        if (!bm.installPixels(SkImageInfo::MakeA8(dstM.fBounds.width(), dstM.fBounds.height()),
                              autoDst.release(), dstM.fRowBytes, mask_release_proc, nullptr)) {
            return {};
        }
        bm.setImmutable();
 
        std::tie(filteredMaskView, std::ignore) = GrMakeUncachedBitmapProxyView(
                rContext, bm, skgpu::Mipmapped::kNo, SkBackingFit::kApprox);
        if (!filteredMaskView) {
            return {};
        }
 
        SkASSERT(kMaskOrigin == filteredMaskView.origin());
 
        *drawRect = dstM.fBounds;
 
        if (key->isValid()) {
            key->setCustomData(create_data(*drawRect, unclippedDevShapeBounds));
            std::tie(filteredMaskView, data) = threadSafeCache->addWithData(*key, filteredMaskView);
            // If we got a different view back from 'addWithData' it could have a different drawRect
            *drawRect = extract_draw_rect_from_data(data.get(), unclippedDevShapeBounds);
        }
    }
 
    return filteredMaskView;
}

two_pass_gaussian()

static std::unique_ptr< skgpu::ganesh::SurfaceDrawContext > GrBlurUtils::two_pass_gaussian ( GrRecordingContext *  rContext, GrSurfaceProxyView  srcView, GrColorType  srcColorType, SkAlphaType  srcAlphaType, sk_sp< SkColorSpace >  colorSpace, SkIRect  srcBounds, SkIRect  dstBounds, float  sigmaX, float  sigmaY, int  radiusX, int  radiusY, SkTileMode  mode, SkBackingFit  fit  )

static

Definition at line 1980 of file GrBlurUtils.cpp.

                          {
    SkASSERT(radiusX || radiusY);
    std::unique_ptr<skgpu::ganesh::SurfaceDrawContext> dstSDC;
    if (radiusX > 0) {
        SkBackingFit xFit = radiusY > 0 ? SkBackingFit::kApprox : fit;
        // Expand the dstBounds vertically to produce necessary content for the y-pass. Then we will
        // clip these in a tile-mode dependent way to ensure the tile-mode gets implemented
        // correctly. However, if we're not going to do a y-pass then we must use the original
        // dstBounds without clipping to produce the correct output size.
        SkIRect xPassDstBounds = dstBounds;
        if (radiusY) {
            xPassDstBounds.outset(0, radiusY);
            if (mode == SkTileMode::kRepeat || mode == SkTileMode::kMirror) {
                int srcH = srcBounds.height();
                int srcTop = srcBounds.top();
                if (mode == SkTileMode::kMirror) {
                    srcTop -= srcH;
                    srcH *= 2;
                }
 
                float floatH = srcH;
                // First row above the dst rect where we should restart the tile mode.
                int n = sk_float_floor2int_no_saturate((xPassDstBounds.top() - srcTop) / floatH);
                int topClip = srcTop + n * srcH;
 
                // First row above below the dst rect where we should restart the tile mode.
                n = sk_float_ceil2int_no_saturate((xPassDstBounds.bottom() - srcBounds.bottom()) /
                                                  floatH);
                int bottomClip = srcBounds.bottom() + n * srcH;
 
                xPassDstBounds.fTop = std::max(xPassDstBounds.top(), topClip);
                xPassDstBounds.fBottom = std::min(xPassDstBounds.bottom(), bottomClip);
            } else {
                if (xPassDstBounds.fBottom <= srcBounds.top()) {
                    if (mode == SkTileMode::kDecal) {
                        return nullptr;
                    }
                    xPassDstBounds.fTop = srcBounds.top();
                    xPassDstBounds.fBottom = xPassDstBounds.fTop + 1;
                } else if (xPassDstBounds.fTop >= srcBounds.bottom()) {
                    if (mode == SkTileMode::kDecal) {
                        return nullptr;
                    }
                    xPassDstBounds.fBottom = srcBounds.bottom();
                    xPassDstBounds.fTop = xPassDstBounds.fBottom - 1;
                } else {
                    xPassDstBounds.fTop = std::max(xPassDstBounds.fTop, srcBounds.top());
                    xPassDstBounds.fBottom = std::min(xPassDstBounds.fBottom, srcBounds.bottom());
                }
                int leftSrcEdge = srcBounds.fLeft - radiusX;
                int rightSrcEdge = srcBounds.fRight + radiusX;
                if (mode == SkTileMode::kClamp) {
                    // In clamp the column just outside the src bounds has the same value as the
                    // column just inside, unlike decal.
                    leftSrcEdge += 1;
                    rightSrcEdge -= 1;
                }
                if (xPassDstBounds.fRight <= leftSrcEdge) {
                    if (mode == SkTileMode::kDecal) {
                        return nullptr;
                    }
                    xPassDstBounds.fLeft = xPassDstBounds.fRight - 1;
                } else {
                    xPassDstBounds.fLeft = std::max(xPassDstBounds.fLeft, leftSrcEdge);
                }
                if (xPassDstBounds.fLeft >= rightSrcEdge) {
                    if (mode == SkTileMode::kDecal) {
                        return nullptr;
                    }
                    xPassDstBounds.fRight = xPassDstBounds.fLeft + 1;
                } else {
                    xPassDstBounds.fRight = std::min(xPassDstBounds.fRight, rightSrcEdge);
                }
            }
        }
        dstSDC = convolve_gaussian(rContext,
                                   std::move(srcView),
                                   srcColorType,
                                   srcAlphaType,
                                   srcBounds,
                                   xPassDstBounds,
                                   Direction::kX,
                                   radiusX,
                                   sigmaX,
                                   mode,
                                   colorSpace,
                                   xFit);
        if (!dstSDC) {
            return nullptr;
        }
        srcView = dstSDC->readSurfaceView();
        SkIVector newDstBoundsOffset = dstBounds.topLeft() - xPassDstBounds.topLeft();
        dstBounds = SkIRect::MakeSize(dstBounds.size()).makeOffset(newDstBoundsOffset);
        srcBounds = SkIRect::MakeSize(xPassDstBounds.size());
    }
 
    if (!radiusY) {
        return dstSDC;
    }
 
    return convolve_gaussian(rContext,
                             std::move(srcView),
                             srcColorType,
                             srcAlphaType,
                             srcBounds,
                             dstBounds,
                             Direction::kY,
                             radiusY,
                             sigmaY,
                             mode,
                             std::move(colorSpace),
                             fit);
}

Variable Documentation

kBlurredRRectMaskOrigin

constexpr auto GrBlurUtils::kBlurredRRectMaskOrigin = kTopLeft_GrSurfaceOrigin

staticconstexpr

Definition at line 713 of file GrBlurUtils.cpp.

kBlurRRectMaxDivisions

constexpr int GrBlurUtils::kBlurRRectMaxDivisions = 6

staticconstexpr

Definition at line 39 of file GrBlurUtils.h.

kMaskOrigin

constexpr auto GrBlurUtils::kMaskOrigin = kTopLeft_GrSurfaceOrigin

staticconstexpr

Definition at line 103 of file GrBlurUtils.cpp.