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Bug 1059033 - Part 2: Approximate path stroke extents for culling since its faster. r=Bas

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This commit is contained in:
Matt Woodrow 2014-09-01 15:22:40 +12:00
parent 7b75eff4d9
commit 353397b6a7
1 changed files with 31 additions and 1 deletions
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32
gfx/2d/DrawTargetTiled.cpp
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@ -220,10 +220,40 @@ DrawTargetTiled::FillRect(const Rect& aRect, const Pattern& aPattern, const Draw
}
}
// The logic for this comes from _cairo_stroke_style_max_distance_from_path
static Rect
PathExtentsToMaxStrokeExtents(const StrokeOptions &aStrokeOptions,
const Rect &aRect,
const Matrix &aTransform)
{
float styleExpansionFactor = 0.5f;
if (aStrokeOptions.mLineCap == CapStyle::SQUARE) {
styleExpansionFactor = M_SQRT1_2;
}
if (aStrokeOptions.mLineJoin == JoinStyle::MITER &&
styleExpansionFactor < M_SQRT2 * aStrokeOptions.mMiterLimit) {
styleExpansionFactor = M_SQRT2 * aStrokeOptions.mMiterLimit;
}
styleExpansionFactor *= aStrokeOptions.mLineWidth;
double dx = styleExpansionFactor * hypot(aTransform._11, aTransform._21);
double dy = styleExpansionFactor * hypot(aTransform._22, aTransform._12);
Rect result = aRect;
result.Inflate(dx, dy);
return result;
}
void
DrawTargetTiled::Stroke(const Path* aPath, const Pattern& aPattern, const StrokeOptions& aStrokeOptions, const DrawOptions& aDrawOptions)
{
Rect deviceRect = aPath->GetStrokedBounds(aStrokeOptions, mTransform);
// Approximate the stroke extents, since Path::GetStrokeExtents can be slow
Rect deviceRect = PathExtentsToMaxStrokeExtents(aStrokeOptions,
aPath->GetBounds(mTransform),
mTransform);
for (size_t i = 0; i < mTiles.size(); i++) {
if (deviceRect.Intersects(Rect(mTiles[i].mTileOrigin.x,
mTiles[i].mTileOrigin.y,