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| author |  mtklein <mtklein@chromium.org> | 2016-01-19 12:35:24 -0800 |
|---|---|---|
| committer |  Commit bot <commit-bot@chromium.org> | 2016-01-19 12:35:24 -0800 |
| commit | 8a87bb4d5c23da83ef406ef87b470afa4217d7a4 (patch) | |
| tree | 45c6743aeeaf309f9b57418fa5a5b4171f478619 | |
| parent | 3bd5aba2a0e165997f683cf3aa306661e71464f6 (diff) | |
sdf: use linear edge distance approximation for all gradient directions
Image diff tools tell me there are diffs, but I sure can't see them.
This drops edge_distance() off the chart as far as CPU cost goes.
BUG=skia:4729
GOLD_TRYBOT_URL= https://gold.skia.org/search2?unt=true&query=source_type%3Dgm&master=false&issue=1545893003
Review URL: https://codereview.chromium.org/1545893003
| -rwxr-xr-x | src/core/SkDistanceFieldGen.cpp | 4 |
1 files changed, 4 insertions, 0 deletions
diff --git a/src/core/SkDistanceFieldGen.cpp b/src/core/SkDistanceFieldGen.cpp index 147aefad79..f1ebfa558a 100755 --- a/src/core/SkDistanceFieldGen.cpp +++ b/src/core/SkDistanceFieldGen.cpp @@ -107,6 +107,9 @@ static void init_glyph_data(DFData* data, unsigned char* edges, const unsigned c // computes the distance to an edge given an edge normal vector and a pixel's alpha value // assumes that direction has been pre-normalized static float edge_distance(const SkPoint& direction, float alpha) { +#if 1 // formula (1) + return 0.5f - alpha; +#else // formula (4) float dx = direction.fX; float dy = direction.fY; float distance; @@ -143,6 +146,7 @@ static float edge_distance(const SkPoint& direction, float alpha) { } return distance; +#endif } static void init_distances(DFData* data, unsigned char* edges, int width, int height) { |