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Squashed 'external/stb/stb/' changes from f4a71b13373..f7f20f39fe4

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f7f20f39fe4 update README
8503b888748 Merge branch 'resize_latest' of https://github.com/jeffrbig2/stb into working
6e9f34d5429 Merge branch 'master' into working
2a584248766 2.09 resize - fix defines for GCC arm 32
013ac3beddf stb_image: fix gcc bounds-check warning (believed erroneous)
449758bd74c update stb_image_resize2.h
43201e7788f image resize 2.07
ae721c50eaf Merge pull request #1609 from jeffrbig2/fix_coeffs
2fb057af65b remove test
1828f357dc8 Fix bug in coeff generation on more than 3x downsamples with width and height scale equal
b7cf1246284 stb_image: fix VC6
c59da6729e0 Mark row0 as unused
7f7e3469cf2 clean up comments
7a075fe7c79 Fix 2 pixel to 1 pixel with wrap Fix output buffer for output callback
177b6c6d9d5 Merge branch 'patch-1' of https://github.com/mundusnine/stb into working
2a74e27bdc4 Merge branch 'floatfix' of https://github.com/ybungalobill/stb into working
c497f727861 Merge branch 'dev' into working
aac5e88febc Add contributor
84fa046c7c9 Fix custom types having a string_len of 0(always)
b1947dd6cfb pre-C99; decrease epsilon
d84b174fd35 add self
d7a44685a82 use STBTT_fabs
7e2ade58ea2 stb_truetype -- fix floating point comparison against zero by using a correct epsilon

git-subtree-dir: external/stb/stb
git-subtree-split: f7f20f39fe4f206c6f19e26ebfef7b261ee59ee4
This commit is contained in:
Green Sky
2024-07-18 14:39:09 +02:00
parent 04b3382029
commit ac7437c89b
7 changed files with 362 additions and 116 deletions
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14
stb_truetype.h
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@@ -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 {