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(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();
}
// Blurs a small surface and creates the mask.
static already_AddRefed<SourceSurface>
CreateBlurMask(const IntSize& aRectSize,
RectCornerRadii* aCornerRadii,
gfxIntSize aBlurRadius,
IntMargin& aExtendDestBy,
IntMargin& aSliceBorder,
DrawTarget& aDestDrawTarget)
{
IntMargin slice;
gfxAlphaBoxBlur blur;
IntSize minSize =
ComputeMinSizeForShadowShape(aCornerRadii, aBlurRadius, slice, aRectSize);
IntRect minRect(IntPoint(), minSize);
gfxContext* blurCtx = blur.Init(ThebesRect(Rect(minRect)), gfxIntSize(),
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 = slice + aExtendDestBy;
MOZ_ASSERT(aSliceBorder.LeftRight() <= expandedMinRect.width);
MOZ_ASSERT(aSliceBorder.TopBottom() <= expandedMinRect.height);
return result.forget();
}
static IntSize
ComputeMinSizeForShadowShape(RectCornerRadii* aCornerRadii,
gfxIntSize 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;
}
static IntSize
ComputeMinSizeForShadowShape(const RectCornerRadii* aCornerRadii,
const IntSize& aBlurRadius,
IntMargin& aOutSlice,
const IntSize& aRectSize)
{
Size cornerSize(0, 0);
if (aCornerRadii) {
const RectCornerRadii& corners = *aCornerRadii;
NS_FOR_CSS_FULL_CORNERS(i) {
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;
}
already_AddRefed<mozilla::gfx::SourceSurface>
gfxAlphaBoxBlur::GetInsetBlur(IntMargin& aExtendDestBy,
IntMargin& aSlice,
const Rect aDestinationRect,
const Rect aShadowClipRect,
const IntSize& aBlurRadius,
const IntSize& aSpreadRadius,
const RectCornerRadii& aInnerClipRadii,
const Color& aShadowColor,
const bool& aHasBorderRadius,
const Point aShadowOffset,
bool& aMovedOffset,
DrawTarget* aDestDrawTarget)
{
if (!gBlurCache) {
gBlurCache = new BlurCache();
}
IntRect outerRect;
IntRect innerRect;
ComputeRectsForInsetBoxShadow(aBlurRadius, aSpreadRadius,
outerRect, innerRect,
aSlice, aDestinationRect,
aShadowClipRect, aHasBorderRadius,
aInnerClipRadii);
// If we have a shadow offset larger than the min rect,
// there's no clean way we can properly create a min rect with the offset
// in the correct place and still render correctly. In those cases,
// fallback to just rendering the dest rect as is.
bool useDestRect = (std::abs(aShadowOffset.x) > aSlice.left) ||
(std::abs(aShadowOffset.y) > aSlice.top);
aMovedOffset = false;
if (useDestRect) {
aDestinationRect.ToIntRect(&outerRect);
aShadowClipRect.ToIntRect(&innerRect);
aMovedOffset = true;
}
BlurCacheData* cached =
gBlurCache->LookupInsetBoxShadow(outerRect.Size(), innerRect.Size(),
aBlurRadius, aSpreadRadius,
&aInnerClipRadii, aShadowColor,
aHasBorderRadius,
aDestDrawTarget->GetBackendType());
if (cached && !useDestRect) {
aExtendDestBy = cached->mExtendDest;
// Need to extend it twice: once for the outer rect and once for the inner rect.
aSlice += aExtendDestBy;
aSlice += aExtendDestBy;
// So we don't forget the actual cached blur
RefPtr<SourceSurface> cachedBlur = cached->mBlur;
return cachedBlur.forget();
}
// Dirty rect and skip rect are null for the min inset shadow.
// When rendering inset box shadows, we respect the spread radius by changing
// the shape of the unblurred shadow, and can pass a spread radius of zero here.
IntSize zeroSpread(0, 0);
gfxContext* minGfxContext = Init(ThebesRect(outerRect),
zeroSpread, aBlurRadius, nullptr, nullptr);
if (!minGfxContext) {
return nullptr;
}
DrawTarget* minDrawTarget = minGfxContext->GetDrawTarget();
RefPtr<Path> maskPath =
GetBoxShadowInsetPath(minDrawTarget, IntRectToRect(outerRect),
IntRectToRect(innerRect), aHasBorderRadius,
aInnerClipRadii);
Color black(0.f, 0.f, 0.f, 1.f);
minGfxContext->SetColor(black);
minGfxContext->SetPath(maskPath);
minGfxContext->Fill();
IntPoint topLeft;
RefPtr<SourceSurface> minMask = DoBlur(minDrawTarget, &topLeft);
if (!minMask) {
return nullptr;
}
RefPtr<SourceSurface> minInsetBlur = CreateBoxShadow(minMask, aShadowColor);
if (!minInsetBlur) {
return nullptr;
}
IntRect blurRect(topLeft, minInsetBlur->GetSize());
aExtendDestBy = blurRect - outerRect;
if (useDestRect) {
// Since we're just going to paint the actual rect to the destination
aSlice.SizeTo(0, 0, 0, 0);
} else {
aSlice += aExtendDestBy;
aSlice += aExtendDestBy;
CacheInsetBlur(outerRect.Size(), innerRect.Size(),
aBlurRadius, aSpreadRadius,
&aInnerClipRadii, aShadowColor,
aHasBorderRadius, aDestDrawTarget->GetBackendType(),
aExtendDestBy, minInsetBlur);
}
return minInsetBlur.forget();
}
static void
ComputeRectsForInsetBoxShadow(IntSize aBlurRadius,
IntSize aSpreadRadius,
IntRect& aOutOuterRect,
IntRect& aOutInnerRect,
IntMargin& aOutPathMargins,
const Rect& aDestRect,
const Rect& aShadowClipRect,
bool aHasBorderRadius,
const RectCornerRadii& aInnerClipRectRadii)
{
IntSize rectBufferSize = aBlurRadius + aSpreadRadius;
float cornerWidth = 0;
float cornerHeight = 0;
if (aHasBorderRadius) {
for (size_t i = 0; i < 4; i++) {
cornerWidth = std::max(cornerWidth, aInnerClipRectRadii[i].width);
cornerHeight = std::max(cornerHeight, aInnerClipRectRadii[i].height);
}
}
// Create the inner rect to be the smallest possible size based on
// blur / spread / corner radii
IntMargin innerMargin = IntMargin(ceil(cornerHeight) + rectBufferSize.height,
ceil(cornerWidth) + rectBufferSize.width,
ceil(cornerHeight) + rectBufferSize.height,
ceil(cornerWidth) + rectBufferSize.width);
aOutPathMargins = innerMargin;
// If we have a negative spread radius, we would not have enough
// size to actually do the blur. So the min size must be the abs() of the blur
// and spread radius.
IntSize minBlurSize(std::abs(aSpreadRadius.width) + std::abs(aBlurRadius.width),
std::abs(aSpreadRadius.height) + std::abs(aBlurRadius.height));
IntMargin minInnerMargins = IntMargin(ceil(cornerHeight) + minBlurSize.height,
ceil(cornerWidth) + minBlurSize.width,
ceil(cornerHeight) + minBlurSize.height,
ceil(cornerWidth) + minBlurSize.width);
IntSize minInnerSize(minInnerMargins.LeftRight() + 1,
minInnerMargins.TopBottom() + 1);
if (aShadowClipRect.height < minInnerSize.height) {
minInnerSize.height = aShadowClipRect.height;
}
if (aShadowClipRect.width < minInnerSize.width) {
minInnerSize.width = aShadowClipRect.width;
}
// Then expand the outer rect based on the size between the inner/outer rects
IntSize minOuterSize(minInnerSize);
IntMargin outerRectMargin(rectBufferSize.height, rectBufferSize.width,
rectBufferSize.height, rectBufferSize.width);
minOuterSize.width += outerRectMargin.LeftRight();
minOuterSize.height += outerRectMargin.TopBottom();
aOutOuterRect = IntRect(IntPoint(), minOuterSize);
aOutInnerRect = IntRect(IntPoint(rectBufferSize.width, rectBufferSize.height), minInnerSize);
if (aShadowClipRect.IsEmpty()) {
aOutInnerRect.width = 0;
aOutInnerRect.height = 0;
}
}