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Issue #2364 - Re-factor AlphaBoxBlur

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Only blur one quadrant of a box-shadow and mirror it to the other quadrants.
This applies only if the corners are symmetrical (square corners or equal
corner radii) otherwise we'll fall back to the old method.
This commit is contained in:
Moonchild 2023-10-30 12:23:36 +01:00 • committed by roytam1
commit 8d30faf95f
6 changed files with 556 additions and 351 deletions
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33
gfx/2d/Blur.cpp
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@ -335,10 +335,26 @@ AlphaBoxBlur::AlphaBoxBlur(const Rect& aRect,
const IntSize& aBlurRadius,
const Rect* aDirtyRect,
const Rect* aSkipRect)
: mSpreadRadius(aSpreadRadius),
mBlurRadius(aBlurRadius),
mSurfaceAllocationSize(0)
: mSurfaceAllocationSize(0)
{
Init(aRect, aSpreadRadius, aBlurRadius, aDirtyRect, aSkipRect);
}
AlphaBoxBlur::AlphaBoxBlur()
: mSurfaceAllocationSize(0)
{
}
void
AlphaBoxBlur::Init(const Rect& aRect,
const IntSize& aSpreadRadius,
const IntSize& aBlurRadius,
const Rect* aDirtyRect,
const Rect* aSkipRect)
{
mSpreadRadius = aSpreadRadius;
mBlurRadius = aBlurRadius;
Rect rect(aRect);
rect.Inflate(Size(aBlurRadius + aSpreadRadius));
rect.RoundOut();
@ -355,8 +371,7 @@ AlphaBoxBlur::AlphaBoxBlur(const Rect& aRect,
mHasDirtyRect = false;
}
mRect = IntRect(int32_t(rect.x), int32_t(rect.y),
int32_t(rect.width), int32_t(rect.height));
mRect = TruncatedToInt(rect);
if (mRect.IsEmpty()) {
return;
}
@ -366,11 +381,8 @@ AlphaBoxBlur::AlphaBoxBlur(const Rect& aRect,
// blurring/spreading we need to do. We convert it to IntRect to avoid
// expensive int<->float conversions if we were to use Rect instead.
Rect skipRect = *aSkipRect;
skipRect.RoundIn();
skipRect.Deflate(Size(aBlurRadius + aSpreadRadius));
mSkipRect = IntRect(int32_t(skipRect.x), int32_t(skipRect.y),
int32_t(skipRect.width), int32_t(skipRect.height));
mSkipRect = RoundedIn(skipRect);
mSkipRect = mSkipRect.Intersect(mRect);
if (mSkipRect.IsEqualInterior(mRect))
return;
@ -397,8 +409,7 @@ AlphaBoxBlur::AlphaBoxBlur(const Rect& aRect,
int32_t aStride,
float aSigmaX,
float aSigmaY)
: mRect(int32_t(aRect.x), int32_t(aRect.y),
int32_t(aRect.width), int32_t(aRect.height)),
: mRect(TruncatedToInt(aRect)),
mSpreadRadius(),
mBlurRadius(CalculateBlurRadius(Point(aSigmaX, aSigmaY))),
mStride(aStride),