diff options
| author | pommicket <pommicket@gmail.com> | 2025-09-28 01:05:07 -0400 |
|---|---|---|
| committer | pommicket <pommicket@gmail.com> | 2025-09-28 01:05:07 -0400 |
| commit | 5c0c8ac1d84b93c413604229396d6d3ff590804e (patch) | |
| tree | 985a1016498aa0440dc1663e3f51ac7c460d2789 /lib/stb_truetype.h | |
| parent | 80585f276ee666c9967312671bef081abedf53c3 (diff) | |
Diffstat (limited to 'lib/stb_truetype.h')
| -rw-r--r-- | lib/stb_truetype.h | 14 |
1 files changed, 8 insertions, 6 deletions
diff --git a/lib/stb_truetype.h b/lib/stb_truetype.h index bbf2284..90a5c2e 100644 --- a/lib/stb_truetype.h +++ b/lib/stb_truetype.h @@ -54,7 +54,7 @@ // Hou Qiming Derek Vinyard // Rob Loach Cort Stratton // Kenney Phillis Jr. Brian Costabile -// Ken Voskuil (kaesve) +// Ken Voskuil (kaesve) Yakov Galka // // VERSION HISTORY // @@ -4604,6 +4604,8 @@ STBTT_DEF unsigned char * stbtt_GetGlyphSDF(const stbtt_fontinfo *info, float sc scale_y = -scale_y; { + // distance from singular values (in the same units as the pixel grid) + const float eps = 1./1024, eps2 = eps*eps; int x,y,i,j; float *precompute; stbtt_vertex *verts; @@ -4616,15 +4618,15 @@ STBTT_DEF unsigned char * stbtt_GetGlyphSDF(const stbtt_fontinfo *info, float sc float x0 = verts[i].x*scale_x, y0 = verts[i].y*scale_y; float x1 = verts[j].x*scale_x, y1 = verts[j].y*scale_y; float dist = (float) STBTT_sqrt((x1-x0)*(x1-x0) + (y1-y0)*(y1-y0)); - precompute[i] = (dist == 0) ? 0.0f : 1.0f / dist; + precompute[i] = (dist < eps) ? 0.0f : 1.0f / dist; } else if (verts[i].type == STBTT_vcurve) { float x2 = verts[j].x *scale_x, y2 = verts[j].y *scale_y; float x1 = verts[i].cx*scale_x, y1 = verts[i].cy*scale_y; float x0 = verts[i].x *scale_x, y0 = verts[i].y *scale_y; float bx = x0 - 2*x1 + x2, by = y0 - 2*y1 + y2; float len2 = bx*bx + by*by; - if (len2 != 0.0f) - precompute[i] = 1.0f / (bx*bx + by*by); + if (len2 >= eps2) + precompute[i] = 1.0f / len2; else precompute[i] = 0.0f; } else @@ -4689,8 +4691,8 @@ STBTT_DEF unsigned char * stbtt_GetGlyphSDF(const stbtt_fontinfo *info, float sc float a = 3*(ax*bx + ay*by); float b = 2*(ax*ax + ay*ay) + (mx*bx+my*by); float c = mx*ax+my*ay; - if (a == 0.0) { // if a is 0, it's linear - if (b != 0.0) { + if (STBTT_fabs(a) < eps2) { // if a is 0, it's linear + if (STBTT_fabs(b) >= eps2) { res[num++] = -c/b; } } else { |