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render: add font_baseline() - calculates the y-coordinate for the baseline

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The old baseline calculation was copy-pasted to a couple of places,
and also assumed that the font's height was equal to ascent+descent.

While this is typically true, it isn't necessarily so.

Now, we assume that height >= ascent+descent, and then position the
baseline in "center" (but adjusted for the descent).
This commit is contained in:
Daniel Eklöf 2019-08-29 20:39:22 +02:00
parent 6d5f200429
commit 013cf61ffb
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1 changed files with 19 additions and 0 deletions
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render.c
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@ -80,6 +80,25 @@ pixman_color_dim_for_search(pixman_color_t *color)
color->blue /= 3;
}
static inline int
font_baseline(const struct terminal *term)
{
assert(term->fextents.ascent >= 0);
assert(term->fextents.descent >= 0);
int diff = term->fextents.height - (term->fextents.ascent + term->fextents.descent);
assert(diff >= 0);
#if 0
LOG_INFO("height=%d, ascent=%d, descent=%d, diff=%d",
term->fextents.height,
term->fextents.ascent, term->fextents.descent,
diff);
#endif
return term->fextents.height - diff / 2 - term->fextents.descent;
}
static void
draw_bar(const struct terminal *term, pixman_image_t *pix,
const pixman_color_t *color, int x, int y)