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stb_truetype: fix incorrect antialiasing computation in v2 rasterizer, and handle certain cases where math blew up

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This commit is contained in:
Sean Barrett
2021-07-11 16:26:02 -07:00
parent e05ecc05ee
commit 0be82e4814
3 changed files with 52 additions and 16 deletions
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2
tests/stb.dsp
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@ -66,7 +66,7 @@ LINK32=link.exe
# PROP Ignore_Export_Lib 0
# PROP Target_Dir ""
# ADD BASE CPP /nologo /W3 /Gm /GX /ZI /Od /D "WIN32" /D "_DEBUG" /D "_CONSOLE" /D "_MBCS" /YX /FD /GZ /c
# ADD CPP /nologo /MTd /W3 /GX /Zi /Od /I ".." /D "WIN32" /D "_DEBUG" /D "_CONSOLE" /D "_MBCS" /D "DS_TEST" /FR /FD /GZ /c
# ADD CPP /nologo /MTd /W3 /GX /Zi /Od /I ".." /D "WIN32" /D "_DEBUG" /D "_CONSOLE" /D "_MBCS" /D "TT_TEST" /FR /FD /GZ /c
# SUBTRACT CPP /YX
# ADD BASE RSC /l 0x409 /d "_DEBUG"
# ADD RSC /l 0x409 /d "_DEBUG"

39
tests/test_truetype.c
View File

@ -37,7 +37,7 @@ int main(int argc, char **argv)
{
stbtt_fontinfo font;
unsigned char *bitmap;
int w,h,i,j,c = (argc > 1 ? atoi(argv[1]) : 34807), s = (argc > 2 ? atoi(argv[2]) : 32);
int w,h,i,j,c = (argc > 1 ? atoi(argv[1]) : '@'), s = (argc > 2 ? atoi(argv[2]) : 32);
//debug();
@ -49,6 +49,25 @@ int main(int argc, char **argv)
stbtt_InitFont(&font, ttf_buffer, stbtt_GetFontOffsetForIndex(ttf_buffer,0));
#if 0
{
stbtt__bitmap b;
stbtt__point p[2];
int wcount[2] = { 2,0 };
p[0].x = 0.2f;
p[0].y = 0.3f;
p[1].x = 3.8f;
p[1].y = 0.8f;
b.w = 16;
b.h = 2;
b.stride = 16;
b.pixels = malloc(b.w*b.h);
stbtt__rasterize(&b, p, wcount, 1, 1, 1, 0, 0, 0, 0, 0, NULL);
for (i=0; i < 8; ++i)
printf("%f\n", b.pixels[i]/255.0);
}
#endif
#if 1
{
static stbtt_pack_context pc;
static stbtt_packedchar cd[256];
@ -60,16 +79,14 @@ int main(int argc, char **argv)
}
#endif
#if 1
{
static stbtt_pack_context pc;
static stbtt_packedchar cd[256];
static unsigned char atlas[1024*1024];
unsigned char *data;
stbtt_PackBegin(&pc, atlas, 1024,1024,1024,1,NULL);
stbtt_PackFontRange(&pc, ttf_buffer, 0, 32.0, 'u', 1, cd);
stbtt_PackEnd(&pc);
data = stbtt_GetCodepointSDF(&font, stbtt_ScaleForPixelHeight(&font,32.0), 'u', 4, 128, 128/4, &w,&h,&i,&j);
for (j=0; j < h; ++j) {
for (i=0; i < w; ++i) {
@ -77,8 +94,8 @@ int main(int argc, char **argv)
}
putchar('\n');
}
return 0;
}
#endif
#if 0
stbtt_BakeFontBitmap(ttf_buffer,stbtt_GetFontOffsetForIndex(ttf_buffer,0), 40.0, temp_bitmap[0],BITMAP_W,BITMAP_H, 32,96, cdata); // no guarantee this fits!
@ -117,8 +134,16 @@ int main(int argc, char **argv)
return 0;
#endif
bitmap = stbtt_GetCodepointBitmap(&font, 0,stbtt_ScaleForPixelHeight(&font, (float)s), c, &w, &h, 0,0);
(void)stbtt_GetCodepointBitmapSubpixel(&font,
0.4972374737262726f,
0.4986416995525360f,
0.2391788959503174f,
0.1752119064331055f,
'd',
&w, &h,
0,0);
bitmap = stbtt_GetCodepointBitmap(&font, 0,stbtt_ScaleForPixelHeight(&font, (float)s), c, &w, &h, 0,0);
for (j=0; j < h; ++j) {
for (i=0; i < w; ++i)
putchar(" .:ioVM@"[bitmap[j*w+i]>>5]);