diff options
Diffstat (limited to 'src/effects')
-rw-r--r-- | src/effects/gradients/Sk4fGradientBase.cpp | 16 |
1 files changed, 15 insertions, 1 deletions
diff --git a/src/effects/gradients/Sk4fGradientBase.cpp b/src/effects/gradients/Sk4fGradientBase.cpp index 02b43fe08a..442916638b 100644 --- a/src/effects/gradients/Sk4fGradientBase.cpp +++ b/src/effects/gradients/Sk4fGradientBase.cpp @@ -207,8 +207,9 @@ GradientShaderBase4fContext::GradientShaderBase4fContext(const SkGradientShaderB clamp_color, clamp_pos, componentScale); } else if (shader.fTileMode == SkShader::kMirror_TileMode) { + const int count = fIntervals.count(); // synthetic flipped intervals in [1 .. 2) - for (int i = fIntervals.count() - 1; i >= 0; --i) { + for (int i = count - 1; i >= 0; --i) { const Interval& interval = fIntervals[i]; const SkScalar p0 = interval.fP0; const SkScalar p1 = interval.fP1; @@ -216,6 +217,19 @@ GradientShaderBase4fContext::GradientShaderBase4fContext(const SkGradientShaderB Sk4f c = Sk4f::Load(interval.fC0.fVec) + dc * Sk4f(p1 - p0); fIntervals.emplace_back(c, dc * Sk4f(-1), 2 - p1, 2 - p0); } + + if (!dx_is_pos) { + // When dx is negative, our initial invervals are in (1..0] order. + // The loop above appends their flipped counterparts, pivoted in 2: (1..0](2..1] + // To achieve the expected monotonic interval order, we need to + // swap the two halves: (2..1](1..0] + // TODO: we can probably avoid this late swap with some additional logic during + // the initial interval buildup. + SkASSERT(fIntervals.count() == count * 2) + for (int i = 0; i < count; ++i) { + SkTSwap(fIntervals[i], fIntervals[count + i]); + } + } } SkASSERT(fIntervals.count() > 0); |