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Put back the 0.5 bias in the shader. Only adjust the radii for the geometry, not the radii constants.

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After working through this with Jim, this is more mathematically correct, and also accounts for the inner radius.

BUG=skia:
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Review URL: https://codereview.chromium.org/1692683003
This commit is contained in:
brianosman 2016-02-12 10:20:00 -08:00 committed by Commit bot
parent de8e54ccfd
commit c6052ac41a
1 changed files with 5 additions and 5 deletions
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10
src/gpu/GrOvalRenderer.cpp
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@ -297,7 +297,7 @@ public:
// avoid calling inversesqrt on zero.
fragBuilder->codeAppend("grad_dot = max(grad_dot, 1.0e-4);");
fragBuilder->codeAppend("float invlen = inversesqrt(grad_dot);");
fragBuilder->codeAppend("float edgeAlpha = clamp(-test*invlen, 0.0, 1.0);");
fragBuilder->codeAppend("float edgeAlpha = clamp(0.5-test*invlen, 0.0, 1.0);");
// for inner curve
if (ee.isStroked()) {
@ -1081,8 +1081,8 @@ static GrDrawBatch* create_ellipse_batch(GrColor color,
// We've extended the outer x radius out half a pixel to antialias.
// This will also expand the rect so all the pixels will be captured.
// TODO: Consider if we should use sqrt(2)/2 instead
xRadius += SK_ScalarHalf;
yRadius += SK_ScalarHalf;
SkScalar geoXRadius = xRadius + SK_ScalarHalf;
SkScalar geoYRadius = yRadius + SK_ScalarHalf;
EllipseBatch::Geometry geometry;
geometry.fViewMatrix = viewMatrix;
@ -1092,8 +1092,8 @@ static GrDrawBatch* create_ellipse_batch(GrColor color,
geometry.fInnerXRadius = innerXRadius;
geometry.fInnerYRadius = innerYRadius;
geometry.fStroke = isStrokeOnly && innerXRadius > 0 && innerYRadius > 0;
geometry.fDevBounds = SkRect::MakeLTRB(center.fX - xRadius, center.fY - yRadius,
center.fX + xRadius, center.fY + yRadius);
geometry.fDevBounds = SkRect::MakeLTRB(center.fX - geoXRadius, center.fY - geoYRadius,
center.fX + geoXRadius, center.fY + geoYRadius);
return EllipseBatch::Create(geometry);
}