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#include <u.h>
#include <libn.h>
#include <libfont.h>
#define STB_IMAGE_WRITE_IMPLEMENTATION
#include "stb_image_write.h"
#define DIV 2
#define W 1920/DIV
#define H 1080
#define L H/80
static char *phrase = "strlen(info)=000";
int
main()
{
int i, j, k, err;
float x, dx, dy, scale, sx, sy;
uchar *bitmap, *work;
font·Info *info;
mmap·Reader fontfile;
int w, h, off, y, ascent, descent, baseln;
int adv, lsb, r0[2], r1[2];
err = 0;
fontfile = mmap·open("/home/nolln/root/data/Inconsolata-Regular.ttf");
if (!fontfile.len) {
err = 1;
goto end;
}
info = font·make(fontfile.ubuf, 0, mem·sys, nil);
if (!info)
panicf("failed to load info");
bitmap = calloc(W*H, sizeof(*bitmap));
scale = font·scaleheightto(info, L);
font·vmetrics(info, &ascent, &descent, &baseln);
ascent *= scale;
x = 0.;
dy = 0.;
for (i = 0; i < strlen(phrase); i++) {
dx = x - (float)floor(x);
font·code_hmetrics(info, phrase[i], &adv, &lsb);
font·code_bbox_subpixel(info, phrase[i], scale, scale, dx, 0, r0, r0+1, r1, r1+1);
y = ascent + r0[1];
dy = y - (float)floor(y);
w = r1[0]-r0[0];
h = r1[1]-r0[1];
work = calloc(w*h, sizeof(*bitmap));
font·code_fillbitmap_subpixel_prefilter(info, work, w, h, w, scale, scale, dx, 0, 1, 1, &sx, &sy, phrase[i]);
off = (int)floor(x+sx) + r0[0] + ((int)floor(sy)+y) * W;
for (j = 0; j < h; j++) {
for (k = 0; k < w; k++) {
bitmap[off + W*j + k] += work[k + w*j];
}
}
free(work);
x += scale * adv;
if (phrase[i+1])
x += scale * font·code_kernadvance(info, phrase[i], phrase[i+1]);
}
stbi_write_png("out.png", W, H, 1, bitmap, W);
font·free(info);
free(bitmap);
end:
mmap·close(fontfile);
return err;
}
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