| Commit message (Collapse) | Author | Age |
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BUG=skia:3075
TEST=ninja -C out/Debug
TBR=reed@google.com
Review URL: https://codereview.chromium.org/831113002
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Draw thick-stroked Beziers by computing the outset quadratic, measuring the error, and subdividing until the error is within a predetermined limit.
To try this CL out, change src/core/SkStroke.h:18 to
#define QUAD_STROKE_APPROXIMATION 1
or from the command line: CPPFLAGS="-D QUAD_STROKE_APPROXIMATION=1" ./gyp_skia
Here's what's in this CL:
bench/BezierBench.cpp : a microbench for examining where the time is going
gm/beziers.cpp : random Beziers with various thicknesses
gm/smallarc.cpp : a distillation of bug skia:2769
samplecode/SampleRotateCircles.cpp : controls added for error, limit, width
src/core/SkStroke.cpp : the new stroke implementation (disabled)
tests/StrokerTest.cpp : a stroke torture test that checks normal and extreme values
The new stroke algorithm has a tweakable parameter:
stroker.setError(1); (SkStrokeRec.cpp:112)
The stroke error is the allowable gap between the midpoint of the stroke quadratic and the center Bezier. As the projection from the quadratic approaches the endpoints, the error is decreased proportionally so that it is always inside the quadratic curve.
An overview of how this works:
- For a given T range of a Bezier, compute the perpendiculars and find the points outset and inset for some radius.
- Construct tangents for the quadratic stroke.
- If the tangent don't intersect between them (may happen with cubics), subdivide.
- If the quadratic stroke end points are close (again, may happen with cubics), draw a line between them.
- Compute the quadratic formed by the intersecting tangents.
- If the midpoint of the quadratic is close to the midpoint of the Bezier perpendicular, return the quadratic.
- If the end of the stroke at the Bezier midpoint doesn't intersect the quad's bounds, subdivide.
- Find where the Bezier midpoint ray intersects the quadratic.
- If the intersection is too close to the quad's endpoints, subdivide.
- If the error is large proportional to the intersection's distance to the quad's endpoints, subdivide.
BUG=skia:723,skia:2769
Review URL: https://codereview.chromium.org/558163005
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BUG=skia:
R=reed@google.com
Author: reed@chromium.org
Review URL: https://codereview.chromium.org/169063002
git-svn-id: http://skia.googlecode.com/svn/trunk@13473 2bbb7eff-a529-9590-31e7-b0007b416f81
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BUG=skia:
Review URL: https://codereview.chromium.org/147683003
git-svn-id: http://skia.googlecode.com/svn/trunk@13190 2bbb7eff-a529-9590-31e7-b0007b416f81
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The goal here is to get people to start using the new random number
generator, while leaving the old one in place so we don't have to
rebaseline GMs.
R=reed@google.com, bsalomon@google.com
Author: jvanverth@google.com
Review URL: https://chromiumcodereview.appspot.com/23576015
git-svn-id: http://skia.googlecode.com/svn/trunk@11169 2bbb7eff-a529-9590-31e7-b0007b416f81
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This change makes tests, benches and samples use the new SkMWCRandom PRNG. GMs will be saved for another time, as they'll require rebaselining.
R=reed@google.com, bsalomon@google.com
Author: jvanverth@google.com
Review URL: https://chromiumcodereview.appspot.com/23653018
git-svn-id: http://skia.googlecode.com/svn/trunk@11136 2bbb7eff-a529-9590-31e7-b0007b416f81
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git-svn-id: http://skia.googlecode.com/svn/trunk@7406 2bbb7eff-a529-9590-31e7-b0007b416f81
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Review URL: https://codereview.appspot.com/7062054
git-svn-id: http://skia.googlecode.com/svn/trunk@7082 2bbb7eff-a529-9590-31e7-b0007b416f81
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Review URL: https://codereview.appspot.com/7073044
git-svn-id: http://skia.googlecode.com/svn/trunk@7064 2bbb7eff-a529-9590-31e7-b0007b416f81
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SkIntToScalar call.
git-svn-id: http://skia.googlecode.com/svn/trunk@6993 2bbb7eff-a529-9590-31e7-b0007b416f81
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git-svn-id: http://skia.googlecode.com/svn/trunk@6947 2bbb7eff-a529-9590-31e7-b0007b416f81
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update samples for circle testing
git-svn-id: http://skia.googlecode.com/svn/trunk@6943 2bbb7eff-a529-9590-31e7-b0007b416f81
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git-svn-id: http://skia.googlecode.com/svn/trunk@6934 2bbb7eff-a529-9590-31e7-b0007b416f81
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git-svn-id: http://skia.googlecode.com/svn/trunk@6932 2bbb7eff-a529-9590-31e7-b0007b416f81
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