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diff --git a/gfx/thebes/gfxBlur.cpp b/gfx/thebes/gfxBlur.cpp
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+/* -*- Mode: C++; tab-width: 4; indent-tabs-mode: nil; c-basic-offset: 2 -*-
+ * This Source Code Form is subject to the terms of the Mozilla Public
+ * License, v. 2.0. If a copy of the MPL was not distributed with this
+ * file, You can obtain one at http://mozilla.org/MPL/2.0/. */
+
+#include "gfxBlur.h"
+
+#include "gfx2DGlue.h"
+#include "gfxContext.h"
+#include "gfxPlatform.h"
+#include "mozilla/gfx/2D.h"
+#include "mozilla/gfx/Blur.h"
+#include "mozilla/gfx/PathHelpers.h"
+#include "mozilla/Maybe.h"
+#include "nsExpirationTracker.h"
+#include "nsClassHashtable.h"
+#include "gfxUtils.h"
+#include <limits>
+#include <cmath>
+
+using namespace mozilla;
+using namespace mozilla::gfx;
+
+gfxAlphaBoxBlur::~gfxAlphaBoxBlur() = default;
+
+UniquePtr<gfxContext> gfxAlphaBoxBlur::Init(gfxContext* aDestinationCtx,
+ const gfxRect& aRect,
+ const IntSize& aSpreadRadius,
+ const IntSize& aBlurRadius,
+ const gfxRect* aDirtyRect,
+ const gfxRect* aSkipRect,
+ bool aUseHardwareAccel) {
+ DrawTarget* refDT = aDestinationCtx->GetDrawTarget();
+ Maybe<Rect> dirtyRect = aDirtyRect ? Some(ToRect(*aDirtyRect)) : Nothing();
+ Maybe<Rect> skipRect = aSkipRect ? Some(ToRect(*aSkipRect)) : Nothing();
+ RefPtr<DrawTarget> dt = InitDrawTarget(
+ refDT, ToRect(aRect), aSpreadRadius, aBlurRadius,
+ dirtyRect.ptrOr(nullptr), skipRect.ptrOr(nullptr), aUseHardwareAccel);
+ if (!dt || !dt->IsValid()) {
+ return nullptr;
+ }
+
+ auto context = MakeUnique<gfxContext>(dt);
+ context->SetMatrix(Matrix::Translation(-mBlur.GetRect().TopLeft()));
+ return context;
+}
+
+already_AddRefed<DrawTarget> gfxAlphaBoxBlur::InitDrawTarget(
+ const DrawTarget* aReferenceDT, const Rect& aRect,
+ const IntSize& aSpreadRadius, const IntSize& aBlurRadius,
+ const Rect* aDirtyRect, const Rect* aSkipRect, bool aUseHardwareAccel) {
+ mBlur.Init(aRect, aSpreadRadius, aBlurRadius, aDirtyRect, aSkipRect);
+ size_t blurDataSize = mBlur.GetSurfaceAllocationSize();
+ if (blurDataSize == 0) {
+ return nullptr;
+ }
+
+ BackendType backend = aReferenceDT->GetBackendType();
+
+ // Check if the backend has an accelerated DrawSurfaceWithShadow.
+ // Currently, only D2D1.1 supports this.
+ // Otherwise, DrawSurfaceWithShadow only supports square blurs without spread.
+ // When blurring small draw targets such as short spans text, the cost of
+ // creating and flushing an accelerated draw target may exceed the speedup
+ // gained from the faster blur. It's up to the users of this blur
+ // to determine whether they want to use hardware acceleration.
+ if (aBlurRadius.IsSquare() && aSpreadRadius.IsEmpty() && aUseHardwareAccel &&
+ backend == BackendType::DIRECT2D1_1) {
+ mAccelerated = true;
+ }
+
+ if (mAccelerated) {
+ // Note: CreateShadowDrawTarget is only implemented for Cairo.
+ mDrawTarget = aReferenceDT->CreateShadowDrawTarget(
+ mBlur.GetSize(), SurfaceFormat::A8,
+ AlphaBoxBlur::CalculateBlurSigma(aBlurRadius.width));
+ if (mDrawTarget) {
+ // See Bug 1526045 - this is to force DT initialization.
+ mDrawTarget->ClearRect(gfx::Rect());
+ }
+ } else {
+ // Make an alpha-only surface to draw on. We will play with the data after
+ // everything is drawn to create a blur effect.
+ // This will be freed when the DrawTarget dies
+ mData = static_cast<uint8_t*>(calloc(1, blurDataSize));
+ if (!mData) {
+ return nullptr;
+ }
+ mDrawTarget =
+ Factory::DoesBackendSupportDataDrawtarget(backend)
+ ? Factory::CreateDrawTargetForData(backend, mData, mBlur.GetSize(),
+ mBlur.GetStride(),
+ SurfaceFormat::A8)
+ : gfxPlatform::CreateDrawTargetForData(
+ mData, mBlur.GetSize(), mBlur.GetStride(), SurfaceFormat::A8);
+ }
+
+ if (!mDrawTarget || !mDrawTarget->IsValid()) {
+ if (mData) {
+ free(mData);
+ }
+
+ return nullptr;
+ }
+
+ if (mData) {
+ mDrawTarget->AddUserData(reinterpret_cast<UserDataKey*>(mDrawTarget.get()),
+ mData, free);
+ }
+
+ mDrawTarget->SetTransform(Matrix::Translation(-mBlur.GetRect().TopLeft()));
+ return do_AddRef(mDrawTarget);
+}
+
+already_AddRefed<SourceSurface> gfxAlphaBoxBlur::DoBlur(
+ const sRGBColor* aShadowColor, IntPoint* aOutTopLeft) {
+ if (aOutTopLeft) {
+ *aOutTopLeft = mBlur.GetRect().TopLeft();
+ }
+
+ RefPtr<SourceSurface> blurMask;
+ if (mData) {
+ mBlur.Blur(mData);
+ blurMask = mDrawTarget->Snapshot();
+ } else if (mAccelerated) {
+ blurMask = mDrawTarget->Snapshot();
+ RefPtr<DrawTarget> blurDT = mDrawTarget->CreateSimilarDrawTarget(
+ blurMask->GetSize(), SurfaceFormat::A8);
+ if (!blurDT) {
+ return nullptr;
+ }
+ blurDT->DrawSurfaceWithShadow(
+ blurMask, Point(0, 0),
+ ShadowOptions(
+ DeviceColor::MaskOpaqueWhite(), Point(0, 0),
+ AlphaBoxBlur::CalculateBlurSigma(mBlur.GetBlurRadius().width)),
+ CompositionOp::OP_OVER);
+ blurMask = blurDT->Snapshot();
+ }
+
+ if (!aShadowColor) {
+ return blurMask.forget();
+ }
+
+ RefPtr<DrawTarget> shadowDT = mDrawTarget->CreateSimilarDrawTarget(
+ blurMask->GetSize(), SurfaceFormat::B8G8R8A8);
+ if (!shadowDT) {
+ return nullptr;
+ }
+ ColorPattern shadowColor(ToDeviceColor(*aShadowColor));
+ shadowDT->MaskSurface(shadowColor, blurMask, Point(0, 0));
+
+ return shadowDT->Snapshot();
+}
+
+void gfxAlphaBoxBlur::Paint(gfxContext* aDestinationCtx) {
+ if (mDrawTarget && !mAccelerated && !mData) {
+ return;
+ }
+
+ DrawTarget* dest = aDestinationCtx->GetDrawTarget();
+ if (!dest) {
+ NS_WARNING("Blurring not supported for Thebes contexts!");
+ return;
+ }
+
+ RefPtr<gfxPattern> thebesPat = aDestinationCtx->GetPattern();
+ Pattern* pat = thebesPat->GetPattern(dest, nullptr);
+ if (!pat) {
+ NS_WARNING("Failed to get pattern for blur!");
+ return;
+ }
+
+ IntPoint topLeft;
+ RefPtr<SourceSurface> mask = DoBlur(nullptr, &topLeft);
+ if (!mask) {
+ NS_ERROR("Failed to create mask!");
+ return;
+ }
+
+ // Avoid a semi-expensive clip operation if we can, otherwise
+ // clip to the dirty rect
+ Rect* dirtyRect = mBlur.GetDirtyRect();
+ if (dirtyRect) {
+ dest->PushClipRect(*dirtyRect);
+ }
+
+ Matrix oldTransform = dest->GetTransform();
+ Matrix newTransform = oldTransform;
+ newTransform.PreTranslate(topLeft);
+ dest->SetTransform(newTransform);
+
+ dest->MaskSurface(*pat, mask, Point(0, 0));
+
+ dest->SetTransform(oldTransform);
+
+ if (dirtyRect) {
+ dest->PopClip();
+ }
+}
+
+IntSize gfxAlphaBoxBlur::CalculateBlurRadius(const gfxPoint& aStd) {
+ mozilla::gfx::Point std(Float(aStd.x), Float(aStd.y));
+ IntSize size = AlphaBoxBlur::CalculateBlurRadius(std);
+ return IntSize(size.width, size.height);
+}
+
+struct BlurCacheKey : public PLDHashEntryHdr {
+ typedef const BlurCacheKey& KeyType;
+ typedef const BlurCacheKey* KeyTypePointer;
+ enum { ALLOW_MEMMOVE = true };
+
+ IntSize mMinSize;
+ IntSize mBlurRadius;
+ sRGBColor mShadowColor;
+ BackendType mBackend;
+ RectCornerRadii mCornerRadii;
+ bool mIsInset;
+
+ // Only used for inset blurs
+ IntSize mInnerMinSize;
+
+ BlurCacheKey(const IntSize& aMinSize, const IntSize& aBlurRadius,
+ const RectCornerRadii* aCornerRadii,
+ const sRGBColor& aShadowColor, BackendType aBackendType)
+ : BlurCacheKey(aMinSize, IntSize(0, 0), aBlurRadius, aCornerRadii,
+ aShadowColor, false, aBackendType) {}
+
+ explicit BlurCacheKey(const BlurCacheKey* aOther)
+ : mMinSize(aOther->mMinSize),
+ mBlurRadius(aOther->mBlurRadius),
+ mShadowColor(aOther->mShadowColor),
+ mBackend(aOther->mBackend),
+ mCornerRadii(aOther->mCornerRadii),
+ mIsInset(aOther->mIsInset),
+ mInnerMinSize(aOther->mInnerMinSize) {}
+
+ explicit BlurCacheKey(const IntSize& aOuterMinSize,
+ const IntSize& aInnerMinSize,
+ const IntSize& aBlurRadius,
+ const RectCornerRadii* aCornerRadii,
+ const sRGBColor& aShadowColor, bool aIsInset,
+ BackendType aBackendType)
+ : mMinSize(aOuterMinSize),
+ mBlurRadius(aBlurRadius),
+ mShadowColor(aShadowColor),
+ mBackend(aBackendType),
+ mCornerRadii(aCornerRadii ? *aCornerRadii : RectCornerRadii()),
+ mIsInset(aIsInset),
+ mInnerMinSize(aInnerMinSize) {}
+
+ BlurCacheKey(BlurCacheKey&&) = default;
+
+ static PLDHashNumber HashKey(const KeyTypePointer aKey) {
+ PLDHashNumber hash = 0;
+ hash = AddToHash(hash, aKey->mMinSize.width, aKey->mMinSize.height);
+ hash = AddToHash(hash, aKey->mBlurRadius.width, aKey->mBlurRadius.height);
+
+ hash = AddToHash(
+ hash, HashBytes(&aKey->mShadowColor.r, sizeof(aKey->mShadowColor.r)));
+ hash = AddToHash(
+ hash, HashBytes(&aKey->mShadowColor.g, sizeof(aKey->mShadowColor.g)));
+ hash = AddToHash(
+ hash, HashBytes(&aKey->mShadowColor.b, sizeof(aKey->mShadowColor.b)));
+ hash = AddToHash(
+ hash, HashBytes(&aKey->mShadowColor.a, sizeof(aKey->mShadowColor.a)));
+
+ for (int i = 0; i < 4; i++) {
+ hash = AddToHash(hash, aKey->mCornerRadii[i].width,
+ aKey->mCornerRadii[i].height);
+ }
+
+ hash = AddToHash(hash, (uint32_t)aKey->mBackend);
+
+ if (aKey->mIsInset) {
+ hash = AddToHash(hash, aKey->mInnerMinSize.width,
+ aKey->mInnerMinSize.height);
+ }
+ return hash;
+ }
+
+ bool KeyEquals(KeyTypePointer aKey) const {
+ if (aKey->mMinSize == mMinSize && aKey->mBlurRadius == mBlurRadius &&
+ aKey->mCornerRadii == mCornerRadii &&
+ aKey->mShadowColor == mShadowColor && aKey->mBackend == mBackend) {
+ if (mIsInset) {
+ return (mInnerMinSize == aKey->mInnerMinSize);
+ }
+
+ return true;
+ }
+
+ return false;
+ }
+
+ static KeyTypePointer KeyToPointer(KeyType aKey) { return &aKey; }
+};
+
+/**
+ * This class is what is cached. It need to be allocated in an object separated
+ * to the cache entry to be able to be tracked by the nsExpirationTracker.
+ * */
+struct BlurCacheData {
+ BlurCacheData(SourceSurface* aBlur, const IntMargin& aBlurMargin,
+ BlurCacheKey&& aKey)
+ : mBlur(aBlur), mBlurMargin(aBlurMargin), mKey(std::move(aKey)) {}
+
+ BlurCacheData(BlurCacheData&& aOther) = default;
+
+ nsExpirationState* GetExpirationState() { return &mExpirationState; }
+
+ nsExpirationState mExpirationState;
+ RefPtr<SourceSurface> mBlur;
+ IntMargin mBlurMargin;
+ BlurCacheKey mKey;
+};
+
+/**
+ * This class implements a cache with no maximum size, that retains the
+ * SourceSurfaces used to draw the blurs.
+ *
+ * An entry stays in the cache as long as it is used often.
+ */
+class BlurCache final : public nsExpirationTracker<BlurCacheData, 4> {
+ public:
+ BlurCache()
+ : nsExpirationTracker<BlurCacheData, 4>(GENERATION_MS, "BlurCache") {}
+
+ virtual void NotifyExpired(BlurCacheData* aObject) override {
+ RemoveObject(aObject);
+ mHashEntries.Remove(aObject->mKey);
+ }
+
+ BlurCacheData* Lookup(const IntSize& aMinSize, const IntSize& aBlurRadius,
+ const RectCornerRadii* aCornerRadii,
+ const sRGBColor& aShadowColor,
+ BackendType aBackendType) {
+ BlurCacheData* blur = mHashEntries.Get(BlurCacheKey(
+ aMinSize, aBlurRadius, aCornerRadii, aShadowColor, aBackendType));
+ if (blur) {
+ MarkUsed(blur);
+ }
+
+ return blur;
+ }
+
+ BlurCacheData* LookupInsetBoxShadow(const IntSize& aOuterMinSize,
+ const IntSize& aInnerMinSize,
+ const IntSize& aBlurRadius,
+ const RectCornerRadii* aCornerRadii,
+ const sRGBColor& aShadowColor,
+ BackendType aBackendType) {
+ bool insetBoxShadow = true;
+ BlurCacheKey key(aOuterMinSize, aInnerMinSize, aBlurRadius, aCornerRadii,
+ aShadowColor, insetBoxShadow, aBackendType);
+ BlurCacheData* blur = mHashEntries.Get(key);
+ if (blur) {
+ MarkUsed(blur);
+ }
+
+ return blur;
+ }
+
+ void RegisterEntry(UniquePtr<BlurCacheData> aValue) {
+ nsresult rv = AddObject(aValue.get());
+ if (NS_FAILED(rv)) {
+ // We are OOM, and we cannot track this object. We don't want stall
+ // entries in the hash table (since the expiration tracker is responsible
+ // for removing the cache entries), so we avoid putting that entry in the
+ // table, which is a good thing considering we are short on memory
+ // anyway, we probably don't want to retain things.
+ return;
+ }
+ mHashEntries.InsertOrUpdate(aValue->mKey, std::move(aValue));
+ }
+
+ protected:
+ static const uint32_t GENERATION_MS = 1000;
+ /**
+ * FIXME use nsTHashtable to avoid duplicating the BlurCacheKey.
+ * https://bugzilla.mozilla.org/show_bug.cgi?id=761393#c47
+ */
+ nsClassHashtable<BlurCacheKey, BlurCacheData> mHashEntries;
+};
+
+static BlurCache* gBlurCache = nullptr;
+
+static IntSize ComputeMinSizeForShadowShape(const RectCornerRadii* aCornerRadii,
+ const IntSize& aBlurRadius,
+ IntMargin& aOutSlice,
+ const IntSize& aRectSize) {
+ Size cornerSize(0, 0);
+ if (aCornerRadii) {
+ const RectCornerRadii& corners = *aCornerRadii;
+ for (const auto i : mozilla::AllPhysicalCorners()) {
+ cornerSize.width = std::max(cornerSize.width, corners[i].width);
+ cornerSize.height = std::max(cornerSize.height, corners[i].height);
+ }
+ }
+
+ IntSize margin = IntSize::Ceil(cornerSize) + aBlurRadius;
+ aOutSlice =
+ IntMargin(margin.height, margin.width, margin.height, margin.width);
+
+ IntSize minSize(aOutSlice.LeftRight() + 1, aOutSlice.TopBottom() + 1);
+
+ // If aRectSize is smaller than minSize, the border-image approach won't
+ // work; there's no way to squeeze parts of the min box-shadow source
+ // image such that the result looks correct. So we need to adjust minSize
+ // in such a way that we can later draw it without stretching in the affected
+ // dimension. We also need to adjust "slice" to ensure that we're not trying
+ // to slice away more than we have.
+ if (aRectSize.width < minSize.width) {
+ minSize.width = aRectSize.width;
+ aOutSlice.left = 0;
+ aOutSlice.right = 0;
+ }
+ if (aRectSize.height < minSize.height) {
+ minSize.height = aRectSize.height;
+ aOutSlice.top = 0;
+ aOutSlice.bottom = 0;
+ }
+
+ MOZ_ASSERT(aOutSlice.LeftRight() <= minSize.width);
+ MOZ_ASSERT(aOutSlice.TopBottom() <= minSize.height);
+ return minSize;
+}
+
+static void CacheBlur(DrawTarget* aDT, const IntSize& aMinSize,
+ const IntSize& aBlurRadius,
+ const RectCornerRadii* aCornerRadii,
+ const sRGBColor& aShadowColor,
+ const IntMargin& aBlurMargin, SourceSurface* aBoxShadow) {
+ gBlurCache->RegisterEntry(MakeUnique<BlurCacheData>(
+ aBoxShadow, aBlurMargin,
+ BlurCacheKey(aMinSize, aBlurRadius, aCornerRadii, aShadowColor,
+ aDT->GetBackendType())));
+}
+
+// Blurs a small surface and creates the colored box shadow.
+static already_AddRefed<SourceSurface> CreateBoxShadow(
+ DrawTarget* aDestDrawTarget, const IntSize& aMinSize,
+ const RectCornerRadii* aCornerRadii, const IntSize& aBlurRadius,
+ const sRGBColor& aShadowColor, bool aMirrorCorners,
+ IntMargin& aOutBlurMargin) {
+ gfxAlphaBoxBlur blur;
+ Rect minRect(Point(0, 0), Size(aMinSize));
+ Rect blurRect(minRect);
+ // If mirroring corners, we only need to draw the top-left quadrant.
+ // Use ceil to preserve the remaining 1x1 middle area for minimized box
+ // shadows.
+ if (aMirrorCorners) {
+ blurRect.SizeTo(ceil(blurRect.Width() * 0.5f),
+ ceil(blurRect.Height() * 0.5f));
+ }
+ IntSize zeroSpread(0, 0);
+ RefPtr<DrawTarget> blurDT =
+ blur.InitDrawTarget(aDestDrawTarget, blurRect, zeroSpread, aBlurRadius);
+ if (!blurDT) {
+ return nullptr;
+ }
+
+ ColorPattern black(DeviceColor::MaskOpaqueBlack());
+
+ if (aCornerRadii) {
+ RefPtr<Path> roundedRect =
+ MakePathForRoundedRect(*blurDT, minRect, *aCornerRadii);
+ blurDT->Fill(roundedRect, black);
+ } else {
+ blurDT->FillRect(minRect, black);
+ }
+
+ IntPoint topLeft;
+ RefPtr<SourceSurface> result = blur.DoBlur(&aShadowColor, &topLeft);
+ if (!result) {
+ return nullptr;
+ }
+
+ // Since blurRect is at (0, 0), we can find the inflated margin by
+ // negating the new rect origin, which would have been negative if
+ // the rect was inflated.
+ aOutBlurMargin = IntMargin(-topLeft.y, -topLeft.x, -topLeft.y, -topLeft.x);
+
+ return result.forget();
+}
+
+static already_AddRefed<SourceSurface> GetBlur(
+ gfxContext* aDestinationCtx, const IntSize& aRectSize,
+ const IntSize& aBlurRadius, const RectCornerRadii* aCornerRadii,
+ const sRGBColor& aShadowColor, bool aMirrorCorners,
+ IntMargin& aOutBlurMargin, IntMargin& aOutSlice, IntSize& aOutMinSize) {
+ if (!gBlurCache) {
+ gBlurCache = new BlurCache();
+ }
+
+ IntSize minSize = ComputeMinSizeForShadowShape(aCornerRadii, aBlurRadius,
+ aOutSlice, aRectSize);
+
+ // We can get seams using the min size rect when drawing to the destination
+ // rect if we have a non-pixel aligned destination transformation. In those
+ // cases, fallback to just rendering the destination rect. During printing, we
+ // record all the Moz 2d commands and replay them on the parent side with
+ // Cairo. Cairo printing uses StretchDIBits to stretch the surface. However,
+ // since our source image is only 1px for some parts, we make thousands of
+ // calls. Instead just render the blur ourself here as one image and send it
+ // over for printing.
+ // TODO: May need to change this with the blob renderer in WR since it also
+ // records.
+ Matrix destMatrix = aDestinationCtx->CurrentMatrix();
+ bool useDestRect = !destMatrix.IsRectilinear() ||
+ destMatrix.HasNonIntegerTranslation() ||
+ aDestinationCtx->GetDrawTarget()->IsRecording();
+ if (useDestRect) {
+ minSize = aRectSize;
+ }
+
+ int32_t maxTextureSize = gfxPlatform::MaxTextureSize();
+ if (minSize.width > maxTextureSize || minSize.height > maxTextureSize) {
+ return nullptr;
+ }
+
+ aOutMinSize = minSize;
+
+ DrawTarget* destDT = aDestinationCtx->GetDrawTarget();
+
+ if (!useDestRect) {
+ BlurCacheData* cached =
+ gBlurCache->Lookup(minSize, aBlurRadius, aCornerRadii, aShadowColor,
+ destDT->GetBackendType());
+ if (cached) {
+ // See CreateBoxShadow() for these values
+ aOutBlurMargin = cached->mBlurMargin;
+ RefPtr<SourceSurface> blur = cached->mBlur;
+ return blur.forget();
+ }
+ }
+
+ RefPtr<SourceSurface> boxShadow =
+ CreateBoxShadow(destDT, minSize, aCornerRadii, aBlurRadius, aShadowColor,
+ aMirrorCorners, aOutBlurMargin);
+ if (!boxShadow) {
+ return nullptr;
+ }
+
+ if (RefPtr<SourceSurface> opt = destDT->OptimizeSourceSurface(boxShadow)) {
+ boxShadow = opt;
+ }
+
+ if (!useDestRect) {
+ CacheBlur(destDT, minSize, aBlurRadius, aCornerRadii, aShadowColor,
+ aOutBlurMargin, boxShadow);
+ }
+ return boxShadow.forget();
+}
+
+void gfxAlphaBoxBlur::ShutdownBlurCache() {
+ delete gBlurCache;
+ gBlurCache = nullptr;
+}
+
+static Rect RectWithEdgesTRBL(Float aTop, Float aRight, Float aBottom,
+ Float aLeft) {
+ return Rect(aLeft, aTop, aRight - aLeft, aBottom - aTop);
+}
+
+static bool ShouldStretchSurface(DrawTarget* aDT, SourceSurface* aSurface) {
+ // Use stretching if possible, since it leads to less seams when the
+ // destination is transformed. However, don't do this if we're using cairo,
+ // because if cairo is using pixman it won't render anything for large
+ // stretch factors because pixman's internal fixed point precision is not
+ // high enough to handle those scale factors.
+ return aDT->GetBackendType() != BackendType::CAIRO;
+}
+
+static void RepeatOrStretchSurface(DrawTarget* aDT, SourceSurface* aSurface,
+ const Rect& aDest, const Rect& aSrc,
+ const Rect& aSkipRect) {
+ if (aSkipRect.Contains(aDest)) {
+ return;
+ }
+
+ if (ShouldStretchSurface(aDT, aSurface)) {
+ aDT->DrawSurface(aSurface, aDest, aSrc);
+ return;
+ }
+
+ SurfacePattern pattern(aSurface, ExtendMode::REPEAT,
+ Matrix::Translation(aDest.TopLeft() - aSrc.TopLeft()),
+ SamplingFilter::GOOD, RoundedToInt(aSrc));
+ aDT->FillRect(aDest, pattern);
+}
+
+static void DrawCorner(DrawTarget* aDT, SourceSurface* aSurface,
+ const Rect& aDest, const Rect& aSrc,
+ const Rect& aSkipRect) {
+ if (aSkipRect.Contains(aDest)) {
+ return;
+ }
+
+ aDT->DrawSurface(aSurface, aDest, aSrc);
+}
+
+static void DrawMinBoxShadow(DrawTarget* aDestDrawTarget,
+ SourceSurface* aSourceBlur, const Rect& aDstOuter,
+ const Rect& aDstInner, const Rect& aSrcOuter,
+ const Rect& aSrcInner, const Rect& aSkipRect,
+ bool aMiddle = false) {
+ // Corners: top left, top right, bottom left, bottom right
+ DrawCorner(aDestDrawTarget, aSourceBlur,
+ RectWithEdgesTRBL(aDstOuter.Y(), aDstInner.X(), aDstInner.Y(),
+ aDstOuter.X()),
+ RectWithEdgesTRBL(aSrcOuter.Y(), aSrcInner.X(), aSrcInner.Y(),
+ aSrcOuter.X()),
+ aSkipRect);
+
+ DrawCorner(aDestDrawTarget, aSourceBlur,
+ RectWithEdgesTRBL(aDstOuter.Y(), aDstOuter.XMost(), aDstInner.Y(),
+ aDstInner.XMost()),
+ RectWithEdgesTRBL(aSrcOuter.Y(), aSrcOuter.XMost(), aSrcInner.Y(),
+ aSrcInner.XMost()),
+ aSkipRect);
+
+ DrawCorner(aDestDrawTarget, aSourceBlur,
+ RectWithEdgesTRBL(aDstInner.YMost(), aDstInner.X(),
+ aDstOuter.YMost(), aDstOuter.X()),
+ RectWithEdgesTRBL(aSrcInner.YMost(), aSrcInner.X(),
+ aSrcOuter.YMost(), aSrcOuter.X()),
+ aSkipRect);
+
+ DrawCorner(aDestDrawTarget, aSourceBlur,
+ RectWithEdgesTRBL(aDstInner.YMost(), aDstOuter.XMost(),
+ aDstOuter.YMost(), aDstInner.XMost()),
+ RectWithEdgesTRBL(aSrcInner.YMost(), aSrcOuter.XMost(),
+ aSrcOuter.YMost(), aSrcInner.XMost()),
+ aSkipRect);
+
+ // Edges: top, left, right, bottom
+ RepeatOrStretchSurface(aDestDrawTarget, aSourceBlur,
+ RectWithEdgesTRBL(aDstOuter.Y(), aDstInner.XMost(),
+ aDstInner.Y(), aDstInner.X()),
+ RectWithEdgesTRBL(aSrcOuter.Y(), aSrcInner.XMost(),
+ aSrcInner.Y(), aSrcInner.X()),
+ aSkipRect);
+ RepeatOrStretchSurface(aDestDrawTarget, aSourceBlur,
+ RectWithEdgesTRBL(aDstInner.Y(), aDstInner.X(),
+ aDstInner.YMost(), aDstOuter.X()),
+ RectWithEdgesTRBL(aSrcInner.Y(), aSrcInner.X(),
+ aSrcInner.YMost(), aSrcOuter.X()),
+ aSkipRect);
+
+ RepeatOrStretchSurface(
+ aDestDrawTarget, aSourceBlur,
+ RectWithEdgesTRBL(aDstInner.Y(), aDstOuter.XMost(), aDstInner.YMost(),
+ aDstInner.XMost()),
+ RectWithEdgesTRBL(aSrcInner.Y(), aSrcOuter.XMost(), aSrcInner.YMost(),
+ aSrcInner.XMost()),
+ aSkipRect);
+ RepeatOrStretchSurface(aDestDrawTarget, aSourceBlur,
+ RectWithEdgesTRBL(aDstInner.YMost(), aDstInner.XMost(),
+ aDstOuter.YMost(), aDstInner.X()),
+ RectWithEdgesTRBL(aSrcInner.YMost(), aSrcInner.XMost(),
+ aSrcOuter.YMost(), aSrcInner.X()),
+ aSkipRect);
+
+ // Middle part
+ if (aMiddle) {
+ RepeatOrStretchSurface(aDestDrawTarget, aSourceBlur,
+ RectWithEdgesTRBL(aDstInner.Y(), aDstInner.XMost(),
+ aDstInner.YMost(), aDstInner.X()),
+ RectWithEdgesTRBL(aSrcInner.Y(), aSrcInner.XMost(),
+ aSrcInner.YMost(), aSrcInner.X()),
+ aSkipRect);
+ }
+}
+
+static void DrawMirroredRect(DrawTarget* aDT, SourceSurface* aSurface,
+ const Rect& aDest, const Point& aSrc,
+ Float aScaleX, Float aScaleY) {
+ SurfacePattern pattern(
+ aSurface, ExtendMode::CLAMP,
+ Matrix::Scaling(aScaleX, aScaleY)
+ .PreTranslate(-aSrc)
+ .PostTranslate(aScaleX < 0 ? aDest.XMost() : aDest.X(),
+ aScaleY < 0 ? aDest.YMost() : aDest.Y()));
+ aDT->FillRect(aDest, pattern);
+}
+
+static void DrawMirroredBoxShadow(DrawTarget* aDT, SourceSurface* aSurface,
+ const Rect& aDestRect) {
+ Point center(ceil(aDestRect.X() + aDestRect.Width() / 2),
+ ceil(aDestRect.Y() + aDestRect.Height() / 2));
+ Rect topLeft(aDestRect.X(), aDestRect.Y(), center.x - aDestRect.X(),
+ center.y - aDestRect.Y());
+ Rect bottomRight(topLeft.BottomRight(), aDestRect.Size() - topLeft.Size());
+ Rect topRight(bottomRight.X(), topLeft.Y(), bottomRight.Width(),
+ topLeft.Height());
+ Rect bottomLeft(topLeft.X(), bottomRight.Y(), topLeft.Width(),
+ bottomRight.Height());
+ DrawMirroredRect(aDT, aSurface, topLeft, Point(), 1, 1);
+ DrawMirroredRect(aDT, aSurface, topRight, Point(), -1, 1);
+ DrawMirroredRect(aDT, aSurface, bottomLeft, Point(), 1, -1);
+ DrawMirroredRect(aDT, aSurface, bottomRight, Point(), -1, -1);
+}
+
+static void DrawMirroredCorner(DrawTarget* aDT, SourceSurface* aSurface,
+ const Rect& aDest, const Point& aSrc,
+ const Rect& aSkipRect, Float aScaleX,
+ Float aScaleY) {
+ if (aSkipRect.Contains(aDest)) {
+ return;
+ }
+
+ DrawMirroredRect(aDT, aSurface, aDest, aSrc, aScaleX, aScaleY);
+}
+
+static void RepeatOrStretchMirroredSurface(DrawTarget* aDT,
+ SourceSurface* aSurface,
+ const Rect& aDest, const Rect& aSrc,
+ const Rect& aSkipRect, Float aScaleX,
+ Float aScaleY) {
+ if (aSkipRect.Contains(aDest)) {
+ return;
+ }
+
+ if (ShouldStretchSurface(aDT, aSurface)) {
+ aScaleX *= aDest.Width() / aSrc.Width();
+ aScaleY *= aDest.Height() / aSrc.Height();
+ DrawMirroredRect(aDT, aSurface, aDest, aSrc.TopLeft(), aScaleX, aScaleY);
+ return;
+ }
+
+ SurfacePattern pattern(
+ aSurface, ExtendMode::REPEAT,
+ Matrix::Scaling(aScaleX, aScaleY)
+ .PreTranslate(-aSrc.TopLeft())
+ .PostTranslate(aScaleX < 0 ? aDest.XMost() : aDest.X(),
+ aScaleY < 0 ? aDest.YMost() : aDest.Y()),
+ SamplingFilter::GOOD, RoundedToInt(aSrc));
+ aDT->FillRect(aDest, pattern);
+}
+
+static void DrawMirroredMinBoxShadow(
+ DrawTarget* aDestDrawTarget, SourceSurface* aSourceBlur,
+ const Rect& aDstOuter, const Rect& aDstInner, const Rect& aSrcOuter,
+ const Rect& aSrcInner, const Rect& aSkipRect, bool aMiddle = false) {
+ // Corners: top left, top right, bottom left, bottom right
+ // Compute quadrant bounds and then clip them to corners along
+ // dimensions where we need to stretch from min size.
+ Point center(ceil(aDstOuter.X() + aDstOuter.Width() / 2),
+ ceil(aDstOuter.Y() + aDstOuter.Height() / 2));
+ Rect topLeft(aDstOuter.X(), aDstOuter.Y(), center.x - aDstOuter.X(),
+ center.y - aDstOuter.Y());
+ Rect bottomRight(topLeft.BottomRight(), aDstOuter.Size() - topLeft.Size());
+ Rect topRight(bottomRight.X(), topLeft.Y(), bottomRight.Width(),
+ topLeft.Height());
+ Rect bottomLeft(topLeft.X(), bottomRight.Y(), topLeft.Width(),
+ bottomRight.Height());
+
+ // Check if the middle part has been minimized along each dimension.
+ // If so, those will be strecthed/drawn separately and need to be clipped out.
+ if (aSrcInner.Width() == 1) {
+ topLeft.SetRightEdge(aDstInner.X());
+ topRight.SetLeftEdge(aDstInner.XMost());
+ bottomLeft.SetRightEdge(aDstInner.X());
+ bottomRight.SetLeftEdge(aDstInner.XMost());
+ }
+ if (aSrcInner.Height() == 1) {
+ topLeft.SetBottomEdge(aDstInner.Y());
+ topRight.SetBottomEdge(aDstInner.Y());
+ bottomLeft.SetTopEdge(aDstInner.YMost());
+ bottomRight.SetTopEdge(aDstInner.YMost());
+ }
+
+ DrawMirroredCorner(aDestDrawTarget, aSourceBlur, topLeft, aSrcOuter.TopLeft(),
+ aSkipRect, 1, 1);
+ DrawMirroredCorner(aDestDrawTarget, aSourceBlur, topRight,
+ aSrcOuter.TopLeft(), aSkipRect, -1, 1);
+ DrawMirroredCorner(aDestDrawTarget, aSourceBlur, bottomLeft,
+ aSrcOuter.TopLeft(), aSkipRect, 1, -1);
+ DrawMirroredCorner(aDestDrawTarget, aSourceBlur, bottomRight,
+ aSrcOuter.TopLeft(), aSkipRect, -1, -1);
+
+ // Edges: top, bottom, left, right
+ // Draw middle edges where they need to be stretched. The top and left
+ // sections that are part of the top-left quadrant will be mirrored to
+ // the bottom and right sections, respectively.
+ if (aSrcInner.Width() == 1) {
+ Rect dstTop = RectWithEdgesTRBL(aDstOuter.Y(), aDstInner.XMost(),
+ aDstInner.Y(), aDstInner.X());
+ Rect srcTop = RectWithEdgesTRBL(aSrcOuter.Y(), aSrcInner.XMost(),
+ aSrcInner.Y(), aSrcInner.X());
+ Rect dstBottom = RectWithEdgesTRBL(aDstInner.YMost(), aDstInner.XMost(),
+ aDstOuter.YMost(), aDstInner.X());
+ Rect srcBottom = RectWithEdgesTRBL(aSrcOuter.Y(), aSrcInner.XMost(),
+ aSrcInner.Y(), aSrcInner.X());
+ // If we only need to stretch along the X axis and we're drawing
+ // the middle section, just sample all the way to the center of the
+ // source on the Y axis to avoid extra draw calls.
+ if (aMiddle && aSrcInner.Height() != 1) {
+ dstTop.SetBottomEdge(center.y);
+ srcTop.SetHeight(dstTop.Height());
+ dstBottom.SetTopEdge(dstTop.YMost());
+ srcBottom.SetHeight(dstBottom.Height());
+ }
+ RepeatOrStretchMirroredSurface(aDestDrawTarget, aSourceBlur, dstTop, srcTop,
+ aSkipRect, 1, 1);
+ RepeatOrStretchMirroredSurface(aDestDrawTarget, aSourceBlur, dstBottom,
+ srcBottom, aSkipRect, 1, -1);
+ }
+
+ if (aSrcInner.Height() == 1) {
+ Rect dstLeft = RectWithEdgesTRBL(aDstInner.Y(), aDstInner.X(),
+ aDstInner.YMost(), aDstOuter.X());
+ Rect srcLeft = RectWithEdgesTRBL(aSrcInner.Y(), aSrcInner.X(),
+ aSrcInner.YMost(), aSrcOuter.X());
+ Rect dstRight = RectWithEdgesTRBL(aDstInner.Y(), aDstOuter.XMost(),
+ aDstInner.YMost(), aDstInner.XMost());
+ Rect srcRight = RectWithEdgesTRBL(aSrcInner.Y(), aSrcInner.X(),
+ aSrcInner.YMost(), aSrcOuter.X());
+ // Only stretching on Y axis, so sample source to the center of the X axis.
+ if (aMiddle && aSrcInner.Width() != 1) {
+ dstLeft.SetRightEdge(center.x);
+ srcLeft.SetWidth(dstLeft.Width());
+ dstRight.SetLeftEdge(dstLeft.XMost());
+ srcRight.SetWidth(dstRight.Width());
+ }
+ RepeatOrStretchMirroredSurface(aDestDrawTarget, aSourceBlur, dstLeft,
+ srcLeft, aSkipRect, 1, 1);
+ RepeatOrStretchMirroredSurface(aDestDrawTarget, aSourceBlur, dstRight,
+ srcRight, aSkipRect, -1, 1);
+ }
+
+ // If we need to stretch along both dimensions, then the middle part
+ // must be drawn separately.
+ if (aMiddle && aSrcInner.Width() == 1 && aSrcInner.Height() == 1) {
+ RepeatOrStretchSurface(aDestDrawTarget, aSourceBlur,
+ RectWithEdgesTRBL(aDstInner.Y(), aDstInner.XMost(),
+ aDstInner.YMost(), aDstInner.X()),
+ RectWithEdgesTRBL(aSrcInner.Y(), aSrcInner.XMost(),
+ aSrcInner.YMost(), aSrcInner.X()),
+ aSkipRect);
+ }
+}
+
+/***
+ * We draw a blurred a rectangle by only blurring a smaller rectangle and
+ * splitting the rectangle into 9 parts.
+ * First, a small minimum source rect is calculated and used to create a blur
+ * mask since the actual blurring itself is expensive. Next, we use the mask
+ * with the given shadow color to create a minimally-sized box shadow of the
+ * right color. Finally, we cut out the 9 parts from the box-shadow source and
+ * paint each part in the right place, stretching the non-corner parts to fill
+ * the space between the corners.
+ */
+
+/* static */
+void gfxAlphaBoxBlur::BlurRectangle(gfxContext* aDestinationCtx,
+ const gfxRect& aRect,
+ const RectCornerRadii* aCornerRadii,
+ const gfxPoint& aBlurStdDev,
+ const sRGBColor& aShadowColor,
+ const gfxRect& aDirtyRect,
+ const gfxRect& aSkipRect) {
+ if (!RectIsInt32Safe(ToRect(aRect))) {
+ return;
+ }
+
+ IntSize blurRadius = CalculateBlurRadius(aBlurStdDev);
+ bool mirrorCorners = !aCornerRadii || aCornerRadii->AreRadiiSame();
+
+ IntRect rect = RoundedToInt(ToRect(aRect));
+ IntMargin blurMargin;
+ IntMargin slice;
+ IntSize minSize;
+ RefPtr<SourceSurface> boxShadow =
+ GetBlur(aDestinationCtx, rect.Size(), blurRadius, aCornerRadii,
+ aShadowColor, mirrorCorners, blurMargin, slice, minSize);
+ if (!boxShadow) {
+ return;
+ }
+
+ DrawTarget* destDrawTarget = aDestinationCtx->GetDrawTarget();
+ destDrawTarget->PushClipRect(ToRect(aDirtyRect));
+
+ // Copy the right parts from boxShadow into destDrawTarget. The middle parts
+ // will be stretched, border-image style.
+
+ Rect srcOuter(Point(blurMargin.left, blurMargin.top), Size(minSize));
+ Rect srcInner(srcOuter);
+ srcOuter.Inflate(Margin(blurMargin));
+ srcInner.Deflate(Margin(slice));
+
+ Rect dstOuter(rect);
+ Rect dstInner(rect);
+ dstOuter.Inflate(Margin(blurMargin));
+ dstInner.Deflate(Margin(slice));
+
+ Rect skipRect = ToRect(aSkipRect);
+
+ if (minSize == rect.Size()) {
+ // The target rect is smaller than the minimal size so just draw the surface
+ if (mirrorCorners) {
+ DrawMirroredBoxShadow(destDrawTarget, boxShadow, dstOuter);
+ } else {
+ destDrawTarget->DrawSurface(boxShadow, dstOuter, srcOuter);
+ }
+ } else {
+ if (mirrorCorners) {
+ DrawMirroredMinBoxShadow(destDrawTarget, boxShadow, dstOuter, dstInner,
+ srcOuter, srcInner, skipRect, true);
+ } else {
+ DrawMinBoxShadow(destDrawTarget, boxShadow, dstOuter, dstInner, srcOuter,
+ srcInner, skipRect, true);
+ }
+ }
+
+ // A note about anti-aliasing and seems between adjacent parts:
+ // We don't explicitly disable anti-aliasing in the DrawSurface calls above,
+ // so if there's a transform on destDrawTarget that is not pixel-aligned,
+ // there will be seams between adjacent parts of the box-shadow. It's hard to
+ // avoid those without the use of an intermediate surface.
+ // You might think that we could avoid those by just turning off AA, but there
+ // is a problem with that: Box-shadow rendering needs to clip out the
+ // element's border box, and we'd like that clip to have anti-aliasing -
+ // especially if the element has rounded corners! So we can't do that unless
+ // we have a way to say "Please anti-alias the clip, but don't antialias the
+ // destination rect of the DrawSurface call".
+
+ destDrawTarget->PopClip();
+}
+
+static already_AddRefed<Path> GetBoxShadowInsetPath(
+ DrawTarget* aDrawTarget, const Rect aOuterRect, const Rect aInnerRect,
+ const RectCornerRadii* aInnerClipRadii) {
+ /***
+ * We create an inset path by having two rects.
+ *
+ * -----------------------
+ * | ________________ |
+ * | | | |
+ * | | | |
+ * | ------------------ |
+ * |_____________________|
+ *
+ * The outer rect and the inside rect. The path
+ * creates a frame around the content where we draw the inset shadow.
+ */
+ RefPtr<PathBuilder> builder =
+ aDrawTarget->CreatePathBuilder(FillRule::FILL_EVEN_ODD);
+ AppendRectToPath(builder, aOuterRect, true);
+
+ if (aInnerClipRadii) {
+ AppendRoundedRectToPath(builder, aInnerRect, *aInnerClipRadii, false);
+ } else {
+ AppendRectToPath(builder, aInnerRect, false);
+ }
+ return builder->Finish();
+}
+
+static void FillDestinationPath(
+ gfxContext* aDestinationCtx, const Rect& aDestinationRect,
+ const Rect& aShadowClipRect, const sRGBColor& aShadowColor,
+ const RectCornerRadii* aInnerClipRadii = nullptr) {
+ // When there is no blur radius, fill the path onto the destination
+ // surface.
+ aDestinationCtx->SetColor(aShadowColor);
+ DrawTarget* destDrawTarget = aDestinationCtx->GetDrawTarget();
+ RefPtr<Path> shadowPath = GetBoxShadowInsetPath(
+ destDrawTarget, aDestinationRect, aShadowClipRect, aInnerClipRadii);
+
+ aDestinationCtx->SetPath(shadowPath);
+ aDestinationCtx->Fill();
+}
+
+static void CacheInsetBlur(const IntSize& aMinOuterSize,
+ const IntSize& aMinInnerSize,
+ const IntSize& aBlurRadius,
+ const RectCornerRadii* aCornerRadii,
+ const sRGBColor& aShadowColor,
+ BackendType aBackendType,
+ SourceSurface* aBoxShadow) {
+ bool isInsetBlur = true;
+ BlurCacheKey key(aMinOuterSize, aMinInnerSize, aBlurRadius, aCornerRadii,
+ aShadowColor, isInsetBlur, aBackendType);
+ IntMargin blurMargin(0, 0, 0, 0);
+
+ gBlurCache->RegisterEntry(
+ MakeUnique<BlurCacheData>(aBoxShadow, blurMargin, std::move(key)));
+}
+
+already_AddRefed<SourceSurface> gfxAlphaBoxBlur::GetInsetBlur(
+ const Rect& aOuterRect, const Rect& aWhitespaceRect, bool aIsDestRect,
+ const sRGBColor& aShadowColor, const IntSize& aBlurRadius,
+ const RectCornerRadii* aInnerClipRadii, DrawTarget* aDestDrawTarget,
+ bool aMirrorCorners) {
+ if (!gBlurCache) {
+ gBlurCache = new BlurCache();
+ }
+
+ IntSize outerSize = IntSize::Truncate(aOuterRect.Size());
+ IntSize whitespaceSize = IntSize::Truncate(aWhitespaceRect.Size());
+ if (!aIsDestRect) {
+ BlurCacheData* cached = gBlurCache->LookupInsetBoxShadow(
+ outerSize, whitespaceSize, aBlurRadius, aInnerClipRadii, aShadowColor,
+ aDestDrawTarget->GetBackendType());
+ if (cached) {
+ // So we don't forget the actual cached blur
+ RefPtr<SourceSurface> cachedBlur = cached->mBlur;
+ return cachedBlur.forget();
+ }
+ }
+
+ // If we can do a min rect, the whitespace rect will be expanded in Init to
+ // aOuterRect.
+ Rect blurRect = aIsDestRect ? aOuterRect : aWhitespaceRect;
+ // If mirroring corners, we only need to draw the top-left quadrant.
+ // Use ceil to preserve the remaining 1x1 middle area for minimized box
+ // shadows.
+ if (aMirrorCorners) {
+ blurRect.SizeTo(ceil(blurRect.Width() * 0.5f),
+ ceil(blurRect.Height() * 0.5f));
+ }
+ IntSize zeroSpread(0, 0);
+ RefPtr<DrawTarget> minDrawTarget =
+ InitDrawTarget(aDestDrawTarget, blurRect, zeroSpread, aBlurRadius);
+ if (!minDrawTarget) {
+ return nullptr;
+ }
+
+ // This is really annoying. When we create the AlphaBoxBlur, the DrawTarget
+ // has a translation applied to it that is the topLeft point. This is actually
+ // the rect we gave it plus the blur radius. The rects we give this for the
+ // outer and whitespace rects are based at (0, 0). We could either translate
+ // those rects when we don't have a destination rect or ignore the translation
+ // when using the dest rect. The dest rects layout gives us expect this
+ // translation.
+ if (!aIsDestRect) {
+ minDrawTarget->SetTransform(Matrix());
+ }
+
+ // Fill in the path between the inside white space / outer rects
+ // NOT the inner frame
+ RefPtr<Path> maskPath = GetBoxShadowInsetPath(
+ minDrawTarget, aOuterRect, aWhitespaceRect, aInnerClipRadii);
+
+ ColorPattern black(DeviceColor::MaskOpaqueBlack());
+ minDrawTarget->Fill(maskPath, black);
+
+ // Blur and fill in with the color we actually wanted
+ RefPtr<SourceSurface> minInsetBlur = DoBlur(&aShadowColor);
+ if (!minInsetBlur) {
+ return nullptr;
+ }
+
+ if (RefPtr<SourceSurface> opt =
+ aDestDrawTarget->OptimizeSourceSurface(minInsetBlur)) {
+ minInsetBlur = opt;
+ }
+
+ if (!aIsDestRect) {
+ CacheInsetBlur(outerSize, whitespaceSize, aBlurRadius, aInnerClipRadii,
+ aShadowColor, aDestDrawTarget->GetBackendType(),
+ minInsetBlur);
+ }
+
+ return minInsetBlur.forget();
+}
+
+/***
+ * We create our minimal rect with 2 rects.
+ * The first is the inside whitespace rect, that is "cut out"
+ * from the box. This is (1). This must be the size
+ * of the blur radius + corner radius so we can have a big enough
+ * inside cut.
+ *
+ * The second (2) is one blur radius surrounding the inner
+ * frame of (1). This is the amount of blur space required
+ * to get a proper blend.
+ *
+ * B = one blur size
+ * W = one blur + corner radii - known as inner margin
+ * ___________________________________
+ * | |
+ * | | | |
+ * | (2) | (1) | (2) |
+ * | B | W | B |
+ * | | | |
+ * | | | |
+ * | | |
+ * |________________________________|
+ */
+static void GetBlurMargins(const RectCornerRadii* aInnerClipRadii,
+ const IntSize& aBlurRadius, Margin& aOutBlurMargin,
+ Margin& aOutInnerMargin) {
+ Size cornerSize(0, 0);
+ if (aInnerClipRadii) {
+ const RectCornerRadii& corners = *aInnerClipRadii;
+ for (const auto i : mozilla::AllPhysicalCorners()) {
+ cornerSize.width = std::max(cornerSize.width, corners[i].width);
+ cornerSize.height = std::max(cornerSize.height, corners[i].height);
+ }
+ }
+
+ // Only the inside whitespace size cares about the border radius size.
+ // Outer sizes only care about blur.
+ IntSize margin = IntSize::Ceil(cornerSize) + aBlurRadius;
+
+ aOutInnerMargin.SizeTo(margin.height, margin.width, margin.height,
+ margin.width);
+ aOutBlurMargin.SizeTo(aBlurRadius.height, aBlurRadius.width,
+ aBlurRadius.height, aBlurRadius.width);
+}
+
+static bool GetInsetBoxShadowRects(const Margin& aBlurMargin,
+ const Margin& aInnerMargin,
+ const Rect& aShadowClipRect,
+ const Rect& aDestinationRect,
+ Rect& aOutWhitespaceRect,
+ Rect& aOutOuterRect) {
+ // We always copy (2 * blur radius) + corner radius worth of data to the
+ // destination rect This covers the blend of the path + the actual blur Need
+ // +1 so that we copy the edges correctly as we'll copy over the min box
+ // shadow corners then the +1 for the edges between Note, the (x,y)
+ // coordinates are from the blur margin since the frame outside the whitespace
+ // rect is 1 blur radius extra space.
+ Rect insideWhiteSpace(aBlurMargin.left, aBlurMargin.top,
+ aInnerMargin.LeftRight() + 1,
+ aInnerMargin.TopBottom() + 1);
+
+ // If the inner white space rect is larger than the shadow clip rect
+ // our approach does not work as we'll just copy one corner
+ // and cover the destination. In those cases, fallback to the destination rect
+ bool useDestRect = (aShadowClipRect.Width() <= aInnerMargin.LeftRight()) ||
+ (aShadowClipRect.Height() <= aInnerMargin.TopBottom());
+
+ if (useDestRect) {
+ aOutWhitespaceRect = aShadowClipRect;
+ aOutOuterRect = aDestinationRect;
+ } else {
+ aOutWhitespaceRect = insideWhiteSpace;
+ aOutOuterRect = aOutWhitespaceRect;
+ aOutOuterRect.Inflate(aBlurMargin);
+ }
+
+ return useDestRect;
+}
+
+void gfxAlphaBoxBlur::BlurInsetBox(
+ gfxContext* aDestinationCtx, const Rect& aDestinationRect,
+ const Rect& aShadowClipRect, const IntSize& aBlurRadius,
+ const sRGBColor& aShadowColor, const RectCornerRadii* aInnerClipRadii,
+ const Rect& aSkipRect, const Point& aShadowOffset) {
+ if ((aBlurRadius.width == 0 && aBlurRadius.height == 0) ||
+ aShadowClipRect.IsEmpty()) {
+ FillDestinationPath(aDestinationCtx, aDestinationRect, aShadowClipRect,
+ aShadowColor, aInnerClipRadii);
+ return;
+ }
+
+ DrawTarget* destDrawTarget = aDestinationCtx->GetDrawTarget();
+
+ Margin innerMargin;
+ Margin blurMargin;
+ GetBlurMargins(aInnerClipRadii, aBlurRadius, blurMargin, innerMargin);
+
+ Rect whitespaceRect;
+ Rect outerRect;
+ bool useDestRect =
+ GetInsetBoxShadowRects(blurMargin, innerMargin, aShadowClipRect,
+ aDestinationRect, whitespaceRect, outerRect);
+
+ // Check that the inset margin between the outer and whitespace rects is
+ // symmetric, and that all corner radii are the same, in which case the blur
+ // can be mirrored.
+ Margin checkMargin = outerRect - whitespaceRect;
+ bool mirrorCorners = checkMargin.left == checkMargin.right &&
+ checkMargin.top == checkMargin.bottom &&
+ (!aInnerClipRadii || aInnerClipRadii->AreRadiiSame());
+ RefPtr<SourceSurface> minBlur =
+ GetInsetBlur(outerRect, whitespaceRect, useDestRect, aShadowColor,
+ aBlurRadius, aInnerClipRadii, destDrawTarget, mirrorCorners);
+ if (!minBlur) {
+ return;
+ }
+
+ if (useDestRect) {
+ Rect destBlur = aDestinationRect;
+ destBlur.Inflate(blurMargin);
+ if (mirrorCorners) {
+ DrawMirroredBoxShadow(destDrawTarget, minBlur.get(), destBlur);
+ } else {
+ Rect srcBlur(Point(0, 0), Size(minBlur->GetSize()));
+ MOZ_ASSERT(RoundedOut(srcBlur).Size() == RoundedOut(destBlur).Size());
+ destDrawTarget->DrawSurface(minBlur, destBlur, srcBlur);
+ }
+ } else {
+ Rect srcOuter(outerRect);
+ Rect srcInner(srcOuter);
+ srcInner.Deflate(blurMargin); // The outer color fill
+ srcInner.Deflate(innerMargin); // The inner whitespace
+
+ // The shadow clip rect already takes into account the spread radius
+ Rect outerFillRect(aShadowClipRect);
+ outerFillRect.Inflate(blurMargin);
+ FillDestinationPath(aDestinationCtx, aDestinationRect, outerFillRect,
+ aShadowColor);
+
+ // Inflate once for the frame around the whitespace
+ Rect destRect(aShadowClipRect);
+ destRect.Inflate(blurMargin);
+
+ // Deflate for the blurred in white space
+ Rect destInnerRect(aShadowClipRect);
+ destInnerRect.Deflate(innerMargin);
+
+ if (mirrorCorners) {
+ DrawMirroredMinBoxShadow(destDrawTarget, minBlur, destRect, destInnerRect,
+ srcOuter, srcInner, aSkipRect);
+ } else {
+ DrawMinBoxShadow(destDrawTarget, minBlur, destRect, destInnerRect,
+ srcOuter, srcInner, aSkipRect);
+ }
+ }
+}
generated by cgit v1.2.3 (git 2.39.1) at 2024-09-14 08:33:49 +0000