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diff --git a/system/graphics/thebes/gfxBlur.cpp b/system/graphics/thebes/gfxBlur.cpp
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+++ b/system/graphics/thebes/gfxBlur.cpp
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+/* -*- Mode: C++; tab-width: 4; indent-tabs-mode: nil; c-basic-offset: 4 -*-
+ * 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/UniquePtr.h"
+#include "mozilla/UniquePtrExtensions.h"
+#include "nsExpirationTracker.h"
+#include "nsClassHashtable.h"
+#include "gfxUtils.h"
+
+using namespace mozilla;
+using namespace mozilla::gfx;
+
+gfxAlphaBoxBlur::gfxAlphaBoxBlur()
+{
+}
+
+gfxAlphaBoxBlur::~gfxAlphaBoxBlur()
+{
+ mContext = nullptr;
+}
+
+gfxContext*
+gfxAlphaBoxBlur::Init(const gfxRect& aRect,
+ const IntSize& aSpreadRadius,
+ const IntSize& aBlurRadius,
+ const gfxRect* aDirtyRect,
+ const gfxRect* aSkipRect)
+{
+ mozilla::gfx::Rect rect(Float(aRect.x), Float(aRect.y),
+ Float(aRect.width), Float(aRect.height));
+ IntSize spreadRadius(aSpreadRadius.width, aSpreadRadius.height);
+ IntSize blurRadius(aBlurRadius.width, aBlurRadius.height);
+ UniquePtr<Rect> dirtyRect;
+ if (aDirtyRect) {
+ dirtyRect = MakeUnique<Rect>(Float(aDirtyRect->x),
+ Float(aDirtyRect->y),
+ Float(aDirtyRect->width),
+ Float(aDirtyRect->height));
+ }
+ UniquePtr<Rect> skipRect;
+ if (aSkipRect) {
+ skipRect = MakeUnique<Rect>(Float(aSkipRect->x),
+ Float(aSkipRect->y),
+ Float(aSkipRect->width),
+ Float(aSkipRect->height));
+ }
+
+ mBlur = MakeUnique<AlphaBoxBlur>(rect, spreadRadius, blurRadius, dirtyRect.get(), skipRect.get());
+ size_t blurDataSize = mBlur->GetSurfaceAllocationSize();
+ if (blurDataSize == 0)
+ return nullptr;
+
+ IntSize size = mBlur->GetSize();
+
+ // Make an alpha-only surface to draw on. We will play with the data after
+ // everything is drawn to create a blur effect.
+ mData = MakeUniqueFallible<unsigned char[]>(blurDataSize);
+ if (!mData) {
+ return nullptr;
+ }
+ memset(mData.get(), 0, blurDataSize);
+
+ RefPtr<DrawTarget> dt =
+ gfxPlatform::CreateDrawTargetForData(mData.get(), size,
+ mBlur->GetStride(),
+ SurfaceFormat::A8);
+ if (!dt || !dt->IsValid()) {
+ return nullptr;
+ }
+
+ IntRect irect = mBlur->GetRect();
+ gfxPoint topleft(irect.TopLeft().x, irect.TopLeft().y);
+
+ mContext = gfxContext::CreateOrNull(dt);
+ MOZ_ASSERT(mContext); // already checked for target above
+ mContext->SetMatrix(gfxMatrix::Translation(-topleft));
+
+ return mContext;
+}
+
+void
+DrawBlur(gfxContext* aDestinationCtx,
+ SourceSurface* aBlur,
+ const IntPoint& aTopLeft,
+ const Rect* aDirtyRect)
+{
+ DrawTarget *dest = aDestinationCtx->GetDrawTarget();
+
+ RefPtr<gfxPattern> thebesPat = aDestinationCtx->GetPattern();
+ Pattern* pat = thebesPat->GetPattern(dest, nullptr);
+
+ Matrix oldTransform = dest->GetTransform();
+ Matrix newTransform = oldTransform;
+ newTransform.PreTranslate(aTopLeft.x, aTopLeft.y);
+
+ // Avoid a semi-expensive clip operation if we can, otherwise
+ // clip to the dirty rect
+ if (aDirtyRect) {
+ dest->PushClipRect(*aDirtyRect);
+ }
+
+ dest->SetTransform(newTransform);
+ dest->MaskSurface(*pat, aBlur, Point(0, 0));
+ dest->SetTransform(oldTransform);
+
+ if (aDirtyRect) {
+ dest->PopClip();
+ }
+}
+
+already_AddRefed<SourceSurface>
+gfxAlphaBoxBlur::DoBlur(DrawTarget* aDT, IntPoint* aTopLeft)
+{
+ mBlur->Blur(mData.get());
+
+ *aTopLeft = mBlur->GetRect().TopLeft();
+
+ return aDT->CreateSourceSurfaceFromData(mData.get(),
+ mBlur->GetSize(),
+ mBlur->GetStride(),
+ SurfaceFormat::A8);
+}
+
+void
+gfxAlphaBoxBlur::Paint(gfxContext* aDestinationCtx)
+{
+ if (!mContext)
+ return;
+
+ DrawTarget *dest = aDestinationCtx->GetDrawTarget();
+ if (!dest) {
+ NS_WARNING("Blurring not supported for Thebes contexts!");
+ return;
+ }
+
+ Rect* dirtyRect = mBlur->GetDirtyRect();
+
+ IntPoint topLeft;
+ RefPtr<SourceSurface> mask = DoBlur(dest, &topLeft);
+ if (!mask) {
+ NS_ERROR("Failed to create mask!");
+ return;
+ }
+
+ DrawBlur(aDestinationCtx, mask, topLeft, dirtyRect);
+}
+
+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;
+ Color mShadowColor;
+ BackendType mBackend;
+ RectCornerRadii mCornerRadii;
+ bool mIsInset;
+
+ // Only used for inset blurs
+ bool mHasBorderRadius;
+ IntSize mInnerMinSize;
+
+ BlurCacheKey(IntSize aMinSize, IntSize aBlurRadius,
+ RectCornerRadii* aCornerRadii, const Color& aShadowColor,
+ BackendType aBackendType)
+ : BlurCacheKey(aMinSize, IntSize(0, 0),
+ aBlurRadius, aCornerRadii,
+ aShadowColor, false,
+ 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)
+ , mHasBorderRadius(aOther->mHasBorderRadius)
+ , mInnerMinSize(aOther->mInnerMinSize)
+ { }
+
+ explicit BlurCacheKey(IntSize aOuterMinSize, IntSize aInnerMinSize,
+ IntSize aBlurRadius,
+ const RectCornerRadii* aCornerRadii,
+ const Color& aShadowColor, bool aIsInset,
+ bool aHasBorderRadius, BackendType aBackendType)
+ : mMinSize(aOuterMinSize)
+ , mBlurRadius(aBlurRadius)
+ , mShadowColor(aShadowColor)
+ , mBackend(aBackendType)
+ , mCornerRadii(aCornerRadii ? *aCornerRadii : RectCornerRadii())
+ , mIsInset(aIsInset)
+ , mHasBorderRadius(aHasBorderRadius)
+ , mInnerMinSize(aInnerMinSize)
+ { }
+
+ 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);
+ hash = AddToHash(hash, HashBytes(&aKey->mHasBorderRadius, sizeof(bool)));
+ }
+ 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 (mHasBorderRadius == aKey->mHasBorderRadius) &&
+ (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, IntMargin aExtendDestBy, const BlurCacheKey& aKey)
+ : mBlur(aBlur)
+ , mExtendDest(aExtendDestBy)
+ , mKey(aKey)
+ {}
+
+ BlurCacheData(const BlurCacheData& aOther)
+ : mBlur(aOther.mBlur)
+ , mExtendDest(aOther.mExtendDest)
+ , mKey(aOther.mKey)
+ { }
+
+ nsExpirationState *GetExpirationState() {
+ return &mExpirationState;
+ }
+
+ nsExpirationState mExpirationState;
+ RefPtr<SourceSurface> mBlur;
+ IntMargin mExtendDest;
+ 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)
+ {
+ RemoveObject(aObject);
+ mHashEntries.Remove(aObject->mKey);
+ }
+
+ BlurCacheData* Lookup(const IntSize aMinSize,
+ const IntSize& aBlurRadius,
+ RectCornerRadii* aCornerRadii,
+ const Color& 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 Color& aShadowColor,
+ const bool& aHasBorderRadius,
+ BackendType aBackendType)
+ {
+ bool insetBoxShadow = true;
+ BlurCacheKey key(aOuterMinSize, aInnerMinSize,
+ aBlurRadius, aCornerRadii,
+ aShadowColor, insetBoxShadow,
+ aHasBorderRadius, aBackendType);
+ BlurCacheData* blur = mHashEntries.Get(key);
+ if (blur) {
+ MarkUsed(blur);
+ }
+
+ return blur;
+ }
+
+ // Returns true if we successfully register the blur in the cache, false
+ // otherwise.
+ bool RegisterEntry(BlurCacheData* aValue)
+ {
+ nsresult rv = AddObject(aValue);
+ 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 things considering we are short on memory
+ // anyway, we probably don't want to retain things.
+ return false;
+ }
+ mHashEntries.Put(aValue->mKey, aValue);
+ return true;
+ }
+
+ 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(RectCornerRadii* aCornerRadii,
+ IntSize aBlurRadius,
+ IntMargin& aSlice,
+ const IntSize& aRectSize)
+{
+ float cornerWidth = 0;
+ float cornerHeight = 0;
+ if (aCornerRadii) {
+ RectCornerRadii corners = *aCornerRadii;
+ for (size_t i = 0; i < 4; i++) {
+ cornerWidth = std::max(cornerWidth, corners[i].width);
+ cornerHeight = std::max(cornerHeight, corners[i].height);
+ }
+ }
+
+ aSlice = IntMargin(ceil(cornerHeight) + aBlurRadius.height,
+ ceil(cornerWidth) + aBlurRadius.width,
+ ceil(cornerHeight) + aBlurRadius.height,
+ ceil(cornerWidth) + aBlurRadius.width);
+
+ IntSize minSize(aSlice.LeftRight() + 1,
+ aSlice.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;
+ aSlice.left = 0;
+ aSlice.right = 0;
+ }
+ if (aRectSize.height < minSize.height) {
+ minSize.height = aRectSize.height;
+ aSlice.top = 0;
+ aSlice.bottom = 0;
+ }
+
+ MOZ_ASSERT(aSlice.LeftRight() <= minSize.width);
+ MOZ_ASSERT(aSlice.TopBottom() <= minSize.height);
+ return minSize;
+}
+
+void
+CacheBlur(DrawTarget& aDT,
+ const IntSize& aMinSize,
+ const IntSize& aBlurRadius,
+ RectCornerRadii* aCornerRadii,
+ const Color& aShadowColor,
+ IntMargin aExtendDest,
+ SourceSurface* aBoxShadow)
+{
+ BlurCacheKey key(aMinSize, aBlurRadius, aCornerRadii, aShadowColor, aDT.GetBackendType());
+ BlurCacheData* data = new BlurCacheData(aBoxShadow, aExtendDest, key);
+ if (!gBlurCache->RegisterEntry(data)) {
+ delete data;
+ }
+}
+
+// Blurs a small surface and creates the mask.
+static already_AddRefed<SourceSurface>
+CreateBlurMask(const IntSize& aMinSize,
+ RectCornerRadii* aCornerRadii,
+ IntSize aBlurRadius,
+ IntMargin& aExtendDestBy,
+ IntMargin& aSliceBorder,
+ DrawTarget& aDestDrawTarget)
+{
+ gfxAlphaBoxBlur blur;
+ IntRect minRect(IntPoint(), aMinSize);
+
+ gfxContext* blurCtx = blur.Init(ThebesRect(Rect(minRect)), IntSize(),
+ aBlurRadius, nullptr, nullptr);
+
+ if (!blurCtx) {
+ return nullptr;
+ }
+
+ DrawTarget* blurDT = blurCtx->GetDrawTarget();
+ ColorPattern black(Color(0.f, 0.f, 0.f, 1.f));
+
+ if (aCornerRadii) {
+ RefPtr<Path> roundedRect =
+ MakePathForRoundedRect(*blurDT, Rect(minRect), *aCornerRadii);
+ blurDT->Fill(roundedRect, black);
+ } else {
+ blurDT->FillRect(Rect(minRect), black);
+ }
+
+ IntPoint topLeft;
+ RefPtr<SourceSurface> result = blur.DoBlur(&aDestDrawTarget, &topLeft);
+ if (!result) {
+ return nullptr;
+ }
+
+ IntRect expandedMinRect(topLeft, result->GetSize());
+ aExtendDestBy = expandedMinRect - minRect;
+ aSliceBorder += aExtendDestBy;
+
+ MOZ_ASSERT(aSliceBorder.LeftRight() <= expandedMinRect.width);
+ MOZ_ASSERT(aSliceBorder.TopBottom() <= expandedMinRect.height);
+
+ return result.forget();
+}
+
+static already_AddRefed<SourceSurface>
+CreateBoxShadow(DrawTarget& aDestDT, SourceSurface* aBlurMask, const Color& aShadowColor)
+{
+ IntSize blurredSize = aBlurMask->GetSize();
+ RefPtr<DrawTarget> boxShadowDT =
+ Factory::CreateDrawTarget(aDestDT.GetBackendType(), blurredSize, SurfaceFormat::B8G8R8A8);
+
+ if (!boxShadowDT) {
+ return nullptr;
+ }
+
+ ColorPattern shadowColor(ToDeviceColor(aShadowColor));
+ boxShadowDT->MaskSurface(shadowColor, aBlurMask, Point(0, 0));
+ return boxShadowDT->Snapshot();
+}
+
+static already_AddRefed<SourceSurface>
+GetBlur(gfxContext* aDestinationCtx,
+ const IntSize& aRectSize,
+ const IntSize& aBlurRadius,
+ RectCornerRadii* aCornerRadii,
+ const Color& aShadowColor,
+ IntMargin& aExtendDestBy,
+ IntMargin& aSlice)
+{
+ if (!gBlurCache) {
+ gBlurCache = new BlurCache();
+ }
+
+ IntSize minSize =
+ ComputeMinSizeForShadowShape(aCornerRadii, aBlurRadius, aSlice, 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.
+ Matrix destMatrix = ToMatrix(aDestinationCtx->CurrentMatrix());
+ bool useDestRect = !destMatrix.IsRectilinear() || destMatrix.HasNonIntegerTranslation();
+ if (useDestRect) {
+ minSize = aRectSize;
+ }
+
+ DrawTarget& destDT = *aDestinationCtx->GetDrawTarget();
+
+ BlurCacheData* cached = gBlurCache->Lookup(minSize, aBlurRadius,
+ aCornerRadii, aShadowColor,
+ destDT.GetBackendType());
+ if (cached && !useDestRect) {
+ // See CreateBlurMask() for these values
+ aExtendDestBy = cached->mExtendDest;
+ aSlice = aSlice + aExtendDestBy;
+ RefPtr<SourceSurface> blur = cached->mBlur;
+ return blur.forget();
+ }
+
+ RefPtr<SourceSurface> blurMask =
+ CreateBlurMask(minSize, aCornerRadii, aBlurRadius, aExtendDestBy, aSlice,
+ destDT);
+
+ if (!blurMask) {
+ return nullptr;
+ }
+
+ RefPtr<SourceSurface> boxShadow = CreateBoxShadow(destDT, blurMask, aShadowColor);
+ if (!boxShadow) {
+ return nullptr;
+ }
+
+ if (useDestRect) {
+ // Since we're just going to paint the actual rect to the destination
+ aSlice.SizeTo(0, 0, 0, 0);
+ } else {
+ CacheBlur(destDT, minSize, aBlurRadius, aCornerRadii, aShadowColor,
+ aExtendDestBy, 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 void
+RepeatOrStretchSurface(DrawTarget& aDT, SourceSurface* aSurface,
+ const Rect& aDest, const Rect& aSrc, Rect& aSkipRect)
+{
+ if (aSkipRect.Contains(aDest)) {
+ return;
+ }
+
+ if ((!aDT.GetTransform().IsRectilinear() &&
+ aDT.GetBackendType() != BackendType::CAIRO) ||
+ (aDT.GetBackendType() == BackendType::DIRECT2D1_1)) {
+ // 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.
+ // Calling FillRect on a D2D backend with a repeating pattern is much slower
+ // than DrawSurface, so special case the D2D backend here.
+ 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, Rect& aSkipRect)
+{
+ if (aSkipRect.Contains(aDest)) {
+ return;
+ }
+
+ aDT.DrawSurface(aSurface, aDest, aSrc);
+}
+
+static void
+DrawBoxShadows(DrawTarget& aDestDrawTarget, SourceSurface* aSourceBlur,
+ Rect aDstOuter, Rect aDstInner, Rect aSrcOuter, Rect aSrcInner,
+ Rect aSkipRect)
+{
+ // 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);
+}
+
+/***
+ * 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,
+ RectCornerRadii* aCornerRadii,
+ const gfxPoint& aBlurStdDev,
+ const Color& aShadowColor,
+ const gfxRect& aDirtyRect,
+ const gfxRect& aSkipRect)
+{
+ IntSize blurRadius = CalculateBlurRadius(aBlurStdDev);
+
+ IntRect rect = RoundedToInt(ToRect(aRect));
+ IntMargin extendDestBy;
+ IntMargin slice;
+
+ RefPtr<SourceSurface> boxShadow = GetBlur(aDestinationCtx,
+ rect.Size(), blurRadius,
+ aCornerRadii, aShadowColor,
+ extendDestBy, slice);
+ 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(), Size(boxShadow->GetSize()));
+ Rect srcInner = srcOuter;
+ srcInner.Deflate(Margin(slice));
+
+ rect.Inflate(extendDestBy);
+ Rect dstOuter(rect);
+ Rect dstInner(rect);
+ dstInner.Deflate(Margin(slice));
+
+ Rect skipRect = ToRect(aSkipRect);
+
+ if (srcInner.IsEqualInterior(srcOuter)) {
+ MOZ_ASSERT(dstInner.IsEqualInterior(dstOuter));
+ // The target rect is smaller than the minimal size so just draw the surface
+ destDrawTarget.DrawSurface(boxShadow, dstInner, srcInner);
+ } else {
+ DrawBoxShadows(destDrawTarget, boxShadow, dstOuter, dstInner,
+ srcOuter, srcInner, skipRect);
+
+ // Middle part
+ RepeatOrStretchSurface(destDrawTarget, boxShadow,
+ RectWithEdgesTRBL(dstInner.Y(), dstInner.XMost(),
+ dstInner.YMost(), dstInner.X()),
+ RectWithEdgesTRBL(srcInner.Y(), srcInner.XMost(),
+ srcInner.YMost(), srcInner.X()),
+ skipRect);
+ }
+
+ // 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 of 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".
+ // On OS X there is an additional problem with turning off AA: CoreGraphics
+ // will not just fill the pixels that have their pixel center inside the
+ // filled shape. Instead, it will fill all the pixels which are partially
+ // covered by the shape. So for pixels on the edge between two adjacent parts,
+ // all those pixels will be painted to by both parts, which looks very bad.
+
+ destDrawTarget.PopClip();
+}
+
+static already_AddRefed<Path>
+GetBoxShadowInsetPath(DrawTarget* aDrawTarget,
+ const Rect aOuterRect, const Rect aInnerRect,
+ const bool aHasBorderRadius, 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 (aHasBorderRadius) {
+ 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 Color& aShadowColor,
+ const bool aHasBorderRadius,
+ const RectCornerRadii& aInnerClipRadii)
+{
+ // 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, aHasBorderRadius,
+ aInnerClipRadii);
+
+ aDestinationCtx->SetPath(shadowPath);
+ aDestinationCtx->Fill();
+}
+
+static void
+CacheInsetBlur(const IntSize aMinOuterSize,
+ const IntSize aMinInnerSize,
+ const IntSize& aBlurRadius,
+ const RectCornerRadii* aCornerRadii,
+ const Color& aShadowColor,
+ const bool& aHasBorderRadius,
+ BackendType aBackendType,
+ SourceSurface* aBoxShadow)
+{
+ bool isInsetBlur = true;
+ BlurCacheKey key(aMinOuterSize, aMinInnerSize,
+ aBlurRadius, aCornerRadii,
+ aShadowColor, isInsetBlur,
+ aHasBorderRadius, aBackendType);
+ IntMargin extendDestBy(0, 0, 0, 0);
+ BlurCacheData* data = new BlurCacheData(aBoxShadow, extendDestBy, key);
+ if (!gBlurCache->RegisterEntry(data)) {
+ delete data;
+ }
+}
+
+already_AddRefed<mozilla::gfx::SourceSurface>
+gfxAlphaBoxBlur::GetInsetBlur(const mozilla::gfx::Rect aOuterRect,
+ const mozilla::gfx::Rect aWhitespaceRect,
+ const bool aIsDestRect,
+ const mozilla::gfx::Color& aShadowColor,
+ const mozilla::gfx::IntSize& aBlurRadius,
+ const bool aHasBorderRadius,
+ const RectCornerRadii& aInnerClipRadii,
+ DrawTarget* aDestDrawTarget)
+{
+ if (!gBlurCache) {
+ gBlurCache = new BlurCache();
+ }
+
+ IntSize outerSize((int)aOuterRect.width, (int)aOuterRect.height);
+ IntSize whitespaceSize((int)aWhitespaceRect.width, (int)aWhitespaceRect.height);
+ BlurCacheData* cached =
+ gBlurCache->LookupInsetBoxShadow(outerSize, whitespaceSize,
+ aBlurRadius, &aInnerClipRadii,
+ aShadowColor, aHasBorderRadius,
+ aDestDrawTarget->GetBackendType());
+
+ if (cached && !aIsDestRect) {
+ // 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;
+ IntSize zeroSpread(0, 0);
+ gfxContext* minGfxContext = Init(ThebesRect(blurRect),
+ zeroSpread, aBlurRadius,
+ nullptr, nullptr);
+ if (!minGfxContext) {
+ return nullptr;
+ }
+
+ // This is really annoying. When we create the AlphaBoxBlur, the gfxContext
+ // 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) {
+ minGfxContext->SetMatrix(gfxMatrix());
+ }
+
+ DrawTarget* minDrawTarget = minGfxContext->GetDrawTarget();
+
+ // Fill in the path between the inside white space / outer rects
+ // NOT the inner frame
+ RefPtr<Path> maskPath =
+ GetBoxShadowInsetPath(minDrawTarget, aOuterRect,
+ aWhitespaceRect, aHasBorderRadius,
+ aInnerClipRadii);
+
+ Color black(0.f, 0.f, 0.f, 1.f);
+ minGfxContext->SetColor(black);
+ minGfxContext->SetPath(maskPath);
+ minGfxContext->Fill();
+
+ // Create the A8 mask
+ IntPoint topLeft;
+ RefPtr<SourceSurface> minMask = DoBlur(minDrawTarget, &topLeft);
+ if (!minMask) {
+ return nullptr;
+ }
+
+ // Fill in with the color we actually wanted
+ RefPtr<SourceSurface> minInsetBlur = CreateBoxShadow(*aDestDrawTarget, minMask, aShadowColor);
+ if (!minInsetBlur) {
+ return nullptr;
+ }
+
+ if (!aIsDestRect) {
+ CacheInsetBlur(outerSize, whitespaceSize,
+ aBlurRadius, &aInnerClipRadii,
+ aShadowColor, aHasBorderRadius,
+ 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 bool aHasBorderRadius,
+ const RectCornerRadii& aInnerClipRadii,
+ const IntSize aBlurRadius,
+ Margin& aOutBlurMargin,
+ Margin& aOutInnerMargin)
+{
+ float cornerWidth = 0;
+ float cornerHeight = 0;
+ if (aHasBorderRadius) {
+ for (size_t i = 0; i < 4; i++) {
+ cornerWidth = std::max(cornerWidth, aInnerClipRadii[i].width);
+ cornerHeight = std::max(cornerHeight, aInnerClipRadii[i].height);
+ }
+ }
+
+ // Only the inside whitespace size cares about the border radius size.
+ // Outer sizes only care about blur.
+ int width = cornerWidth + aBlurRadius.width;
+ int height = cornerHeight + aBlurRadius.height;
+
+ aOutInnerMargin.SizeTo(height, width, height, 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 IntSize aSpreadRadius,
+ const Color& aShadowColor,
+ bool aHasBorderRadius,
+ const RectCornerRadii& aInnerClipRadii,
+ const Rect aSkipRect,
+ const Point aShadowOffset)
+{
+ if ((aBlurRadius.width == 0 && aBlurRadius.height == 0)
+ || aShadowClipRect.IsEmpty()) {
+ FillDestinationPath(aDestinationCtx, aDestinationRect, aShadowClipRect,
+ aShadowColor, aHasBorderRadius, aInnerClipRadii);
+ return;
+ }
+
+ DrawTarget* destDrawTarget = aDestinationCtx->GetDrawTarget();
+
+ Margin innerMargin;
+ Margin blurMargin;
+ GetBlurMargins(aHasBorderRadius, aInnerClipRadii, aBlurRadius,
+ blurMargin, innerMargin);
+
+ Rect whitespaceRect;
+ Rect outerRect;
+ bool useDestRect = GetInsetBoxShadowRects(blurMargin, innerMargin, aShadowClipRect,
+ aDestinationRect, whitespaceRect, outerRect);
+
+ RefPtr<SourceSurface> minBlur = GetInsetBlur(outerRect, whitespaceRect, useDestRect, aShadowColor,
+ aBlurRadius, aHasBorderRadius, aInnerClipRadii,
+ destDrawTarget);
+ if (!minBlur) {
+ return;
+ }
+
+ if (useDestRect) {
+ IntSize blurSize = minBlur->GetSize();
+ Rect srcBlur(0, 0, blurSize.width, blurSize.height);
+ Rect destBlur = aDestinationRect;
+
+ // The blur itself expands the rect by the blur margin, so we
+ // have to mimic that here.
+ destBlur.Inflate(blurMargin);
+ MOZ_ASSERT(srcBlur.Size() == 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, false, RectCornerRadii());
+
+ // 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);
+
+ DrawBoxShadows(*destDrawTarget, minBlur,
+ destRect, destInnerRect,
+ srcOuter, srcInner,
+ aSkipRect);
+ }
+}
generated by cgit v1.2.3 (git 2.26.2) at 2024-11-13 00:04:12 +0000