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/*
* Copyright 2015 Google Inc.
*
* Use of this source code is governed by a BSD-style license that can be
* found in the LICENSE file.
*/
#include "src/gpu/GrBlurUtils.h"
#include "include/gpu/GrDirectContext.h"
#include "include/gpu/GrRecordingContext.h"
#include "src/gpu/GrBitmapTextureMaker.h"
#include "src/gpu/GrCaps.h"
#include "src/gpu/GrDirectContextPriv.h"
#include "src/gpu/GrFixedClip.h"
#include "src/gpu/GrProxyProvider.h"
#include "src/gpu/GrRecordingContextPriv.h"
#include "src/gpu/GrSoftwarePathRenderer.h"
#include "src/gpu/GrStyle.h"
#include "src/gpu/GrSurfaceDrawContext.h"
#include "src/gpu/GrTextureProxy.h"
#include "src/gpu/GrThreadSafeCache.h"
#include "src/gpu/effects/GrTextureEffect.h"
#include "src/gpu/geometry/GrStyledShape.h"
#include "include/core/SkPaint.h"
#include "src/core/SkDraw.h"
#include "src/core/SkMaskFilterBase.h"
#include "src/core/SkMatrixProvider.h"
#include "src/core/SkTLazy.h"
#include "src/gpu/SkGr.h"
static bool clip_bounds_quick_reject(const SkIRect& clipBounds, const SkIRect& rect) {
return clipBounds.isEmpty() || rect.isEmpty() || !SkIRect::Intersects(clipBounds, rect);
}
static constexpr auto kMaskOrigin = kTopLeft_GrSurfaceOrigin;
// Draw a mask using the supplied paint. Since the coverage/geometry
// is already burnt into the mask this boils down to a rect draw.
// Return true if the mask was successfully drawn.
static bool draw_mask(GrSurfaceDrawContext* surfaceDrawContext,
const GrClip* clip,
const SkMatrix& viewMatrix,
const SkIRect& maskBounds,
GrPaint&& paint,
GrSurfaceProxyView mask) {
SkMatrix inverse;
if (!viewMatrix.invert(&inverse)) {
return false;
}
mask.concatSwizzle(GrSwizzle("aaaa"));
SkMatrix matrix = SkMatrix::Translate(-SkIntToScalar(maskBounds.fLeft),
-SkIntToScalar(maskBounds.fTop));
matrix.preConcat(viewMatrix);
paint.setCoverageFragmentProcessor(
GrTextureEffect::Make(std::move(mask), kUnknown_SkAlphaType, matrix));
surfaceDrawContext->fillPixelsWithLocalMatrix(clip, std::move(paint), maskBounds, inverse);
return true;
}
static void mask_release_proc(void* addr, void* /*context*/) {
SkMask::FreeImage(addr);
}
// This stores the mapping from an unclipped, integerized, device-space, shape bounds to
// the filtered mask's draw rect.
struct DrawRectData {
SkIVector fOffset;
SkISize fSize;
};
static sk_sp<SkData> create_data(const SkIRect& drawRect, const SkIRect& origDevBounds) {
DrawRectData drawRectData { {drawRect.fLeft - origDevBounds.fLeft,
drawRect.fTop - origDevBounds.fTop},
drawRect.size() };
return SkData::MakeWithCopy(&drawRectData, sizeof(drawRectData));
}
static SkIRect extract_draw_rect_from_data(SkData* data, const SkIRect& origDevBounds) {
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);
}
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,
GrUniqueKey* key) {
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);
SkMask srcM, dstM;
if (!SkDraw::DrawToMask(devPath, &clipBounds, filter, &viewMatrix, &srcM,
SkMask::kComputeBoundsAndRenderImage_CreateMode, fillOrHairline)) {
return {};
}
SkAutoMaskFreeImage autoSrc(srcM.fImage);
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.fImage);
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();
GrBitmapTextureMaker maker(rContext, bm, SkBackingFit::kApprox);
filteredMaskView = maker.view(GrMipmapped::kNo);
if (!filteredMaskView.proxy()) {
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;
}
// Create a mask of 'shape' and return the resulting surfaceDrawContext
static std::unique_ptr<GrSurfaceDrawContext> create_mask_GPU(GrRecordingContext* context,
const SkIRect& maskRect,
const SkMatrix& origViewMatrix,
const GrStyledShape& shape,
int sampleCnt) {
// Use GrResourceProvider::MakeApprox 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 MakeApprox 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 = GrResourceProvider::MakeApprox(maskRect.size());
auto rtContext = GrSurfaceDrawContext::MakeWithFallback(
context, GrColorType::kAlpha_8, nullptr, SkBackingFit::kExact, approxSize, sampleCnt,
GrMipmapped::kNo, GrProtected::kNo, kMaskOrigin);
if (!rtContext) {
return nullptr;
}
rtContext->clear(SK_PMColor4fTRANSPARENT);
GrPaint maskPaint;
maskPaint.setCoverageSetOpXPFactory(SkRegion::kReplace_Op);
// setup new clip
GrFixedClip clip(rtContext->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));
rtContext->drawShape(&clip, std::move(maskPaint), GrAA::kYes, viewMatrix, GrStyledShape(shape));
return rtContext;
}
static bool get_unclipped_shape_dev_bounds(const GrStyledShape& shape, const SkMatrix& matrix,
SkIRect* devBounds) {
SkRect shapeBounds = shape.styledBounds();
if (shapeBounds.isEmpty()) {
return false;
}
SkRect shapeDevBounds;
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;
}
// Gets the shape bounds, the clip bounds, and the intersection (if any). Returns false if there
// is no intersection.
static bool get_shape_and_clip_bounds(GrSurfaceDrawContext* surfaceDrawContext,
const GrClip* clip,
const GrStyledShape& shape,
const SkMatrix& matrix,
SkIRect* unclippedDevShapeBounds,
SkIRect* devClipBounds) {
// compute bounds as intersection of rt size, clip, and path
*devClipBounds = clip ? clip->getConservativeBounds()
: SkIRect::MakeWH(surfaceDrawContext->width(),
surfaceDrawContext->height());
if (!get_unclipped_shape_dev_bounds(shape, matrix, unclippedDevShapeBounds)) {
*unclippedDevShapeBounds = SkIRect::MakeEmpty();
return false;
}
return true;
}
// The key and clip-bounds are computed together because the caching decision can impact the
// clip-bound - since we only cache un-clipped masks the clip can be removed entirely.
// A 'false' return value indicates that the shape is known to be clipped away.
static bool compute_key_and_clip_bounds(GrUniqueKey* maskKey,
SkIRect* boundsForClip,
const GrCaps* caps,
const SkMatrix& viewMatrix,
bool inverseFilled,
const SkMaskFilterBase* maskFilter,
const GrStyledShape& shape,
const SkIRect& unclippedDevShapeBounds,
const SkIRect& devClipBounds) {
*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;
maskFilter->canFilterMaskGPU(shape, unclippedDevShapeBounds, devClipBounds,
viewMatrix, &clippedMaskRect);
maskFilter->canFilterMaskGPU(shape, unclippedDevShapeBounds, unclippedDevShapeBounds,
viewMatrix, &unClippedMaskRect);
if (clippedMaskRect.isEmpty()) {
return false;
}
// 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 GrUniqueKey::Domain kDomain = GrUniqueKey::GenerateDomain();
GrUniqueKey::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;
}
static GrSurfaceProxyView hw_create_filtered_mask(GrDirectContext* dContext,
GrSurfaceDrawContext* surfaceDrawContext,
const SkMatrix& viewMatrix,
const GrStyledShape& shape,
const SkMaskFilterBase* filter,
const SkIRect& unclippedDevShapeBounds,
const SkIRect& clipBounds,
SkIRect* maskRect,
GrUniqueKey* key) {
if (!filter->canFilterMaskGPU(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<GrSurfaceDrawContext> maskRTC(create_mask_GPU(
dContext,
*maskRect,
viewMatrix,
shape,
surfaceDrawContext->numSamples()));
if (!maskRTC) {
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->filterMaskGPU(dContext,
maskRTC->readSurfaceView(),
maskRTC->colorInfo().colorType(),
maskRTC->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;
}
static void draw_shape_with_mask_filter(GrRecordingContext* rContext,
GrSurfaceDrawContext* surfaceDrawContext,
const GrClip* clip,
GrPaint&& paint,
const SkMatrix& viewMatrix,
const SkMaskFilterBase* maskFilter,
const GrStyledShape& origShape) {
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 (maskFilter->directFilterMaskGPU(rContext, surfaceDrawContext, 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() &&
!GrPathRenderer::IsStrokeHairlineOrEquivalent(shape->style(),
viewMatrix, nullptr);
SkIRect unclippedDevShapeBounds, devClipBounds;
if (!get_shape_and_clip_bounds(surfaceDrawContext, clip, *shape, viewMatrix,
&unclippedDevShapeBounds, &devClipBounds)) {
// TODO: just cons up an opaque mask here
if (!inverseFilled) {
return;
}
}
GrUniqueKey maskKey;
SkIRect boundsForClip;
if (!compute_key_and_clip_bounds(&maskKey, &boundsForClip,
surfaceDrawContext->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, surfaceDrawContext,
viewMatrix, *shape, maskFilter,
unclippedDevShapeBounds, boundsForClip,
&maskRect, &maskKey);
if (filteredMaskView) {
if (draw_mask(surfaceDrawContext, 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(surfaceDrawContext, clip, viewMatrix, maskRect, std::move(paint),
std::move(filteredMaskView))) {
return;
}
assert_alive(paint);
}
}
void GrBlurUtils::drawShapeWithMaskFilter(GrRecordingContext* context,
GrSurfaceDrawContext* surfaceDrawContext,
const GrClip* clip,
const GrStyledShape& shape,
GrPaint&& paint,
const SkMatrix& viewMatrix,
const SkMaskFilter* mf) {
draw_shape_with_mask_filter(context, surfaceDrawContext, clip, std::move(paint),
viewMatrix, as_MFB(mf), shape);
}
void GrBlurUtils::drawShapeWithMaskFilter(GrRecordingContext* context,
GrSurfaceDrawContext* surfaceDrawContext,
const GrClip* clip,
const SkPaint& paint,
const SkMatrixProvider& matrixProvider,
const GrStyledShape& shape) {
if (context->abandoned()) {
return;
}
GrPaint grPaint;
if (!SkPaintToGrPaint(context, surfaceDrawContext->colorInfo(), paint, matrixProvider,
&grPaint)) {
return;
}
const SkMatrix& viewMatrix(matrixProvider.localToDevice());
SkMaskFilterBase* mf = as_MFB(paint.getMaskFilter());
if (mf && !mf->hasFragmentProcessor()) {
// The MaskFilter wasn't already handled in SkPaintToGrPaint
draw_shape_with_mask_filter(context, surfaceDrawContext, clip, std::move(grPaint),
viewMatrix, mf, shape);
} else {
surfaceDrawContext->drawShape(clip, std::move(grPaint), context->priv().chooseAA(paint),
viewMatrix, GrStyledShape(shape));
}
}