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Bug 1462682 - Skia path bounds rounding fix. r=rhunt, a=RyanVM

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This commit is contained in:
Lee Salzman 2018-05-25 15:43:12 -04:00 • committed by Roy Tam
commit 36c694e627
1 changed files with 8 additions and 14 deletions
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22
gfx/skia/skia/src/core/SkScan_Path.cpp
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@ -591,16 +591,10 @@ static bool clip_to_limit(const SkRegion& orig, SkRegion* reduced) {
return true;
}
/**
* Variants of SkScalarRoundToInt, identical to SkDScalarRoundToInt except when the input fraction
* is 0.5. When SK_RASTERIZE_EVEN_ROUNDING is enabled, we must bias the result before rounding to
* account for potential FDot6 rounding edge-cases.
*/
#ifdef SK_RASTERIZE_EVEN_ROUNDING
static const double kRoundBias = 0.5 / SK_FDot6One;
#else
static const double kRoundBias = 0.0;
#endif
// Bias used for conservative rounding of float rects to int rects, to nudge the irects a little
// larger, so we don't "think" a path's bounds are inside a clip, when (due to numeric drift in
// the scan-converter) we might walk beyond the predicted limits.
static const double kConservativeRoundBias = 0.5 + 1.5 / SK_FDot6One;
/**
* Round the value down. This is used to round the top and left of a rectangle,
@ -608,8 +602,8 @@ static const double kRoundBias = 0.0;
*/
static inline int round_down_to_int(SkScalar x) {
double xx = x;
xx -= 0.5 + kRoundBias;
return (int)ceil(xx);
xx -= kConservativeRoundBias;
return pin_double_to_int(ceil(xx));
}
/**
@ -618,8 +612,8 @@ static inline int round_down_to_int(SkScalar x) {
*/
static inline int round_up_to_int(SkScalar x) {
double xx = x;
xx += 0.5 + kRoundBias;
return (int)floor(xx);
xx += kConservativeRoundBias;
return pin_double_to_int(floor(xx));
}
/**