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particle/string: apply font kerning

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Daniel Eklöf 2020-01-18 09:26:50 +01:00
parent e2ea79bb2f
commit b644c75586
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GPG key ID: 5BBD4992C116573F
1 changed files with 11 additions and 1 deletions
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12
particles/string.c
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@ -20,6 +20,7 @@ struct eprivate {
char *text; char *text;
const struct glyph **glyphs; const struct glyph **glyphs;
long *kern_x;
int num_glyphs; int num_glyphs;
}; };
@ -30,6 +31,7 @@ exposable_destroy(struct exposable *exposable)
free(e->text); free(e->text);
free(e->glyphs); free(e->glyphs);
free(e->kern_x);
free(e); free(e);
exposable_default_destroy(exposable); exposable_default_destroy(exposable);
} }
@ -49,6 +51,7 @@ begin_expose(struct exposable *exposable)
mbstowcs(wtext, e->text, chars + 1); mbstowcs(wtext, e->text, chars + 1);
e->glyphs = malloc(chars * sizeof(e->glyphs[0])); e->glyphs = malloc(chars * sizeof(e->glyphs[0]));
e->kern_x = calloc(chars, sizeof(e->kern_x[0]));
/* Convert text to glyph masks/images. */ /* Convert text to glyph masks/images. */
for (size_t i = 0; i < chars; i++) { for (size_t i = 0; i < chars; i++) {
@ -56,6 +59,11 @@ begin_expose(struct exposable *exposable)
if (glyph == NULL) if (glyph == NULL)
continue; continue;
e->glyphs[e->num_glyphs++] = glyph; e->glyphs[e->num_glyphs++] = glyph;
if (i == 0)
continue;
font_kerning(font, wtext[i - 1], wtext[i], &e->kern_x[i], NULL);
} }
} }
@ -64,7 +72,7 @@ begin_expose(struct exposable *exposable)
/* Calculate the size we need to render the glyphs */ /* Calculate the size we need to render the glyphs */
for (int i = 0; i < e->num_glyphs; i++) for (int i = 0; i < e->num_glyphs; i++)
exposable->width += e->glyphs[i]->x_advance; exposable->width += e->kern_x[i] + e->glyphs[i]->x_advance;
return exposable->width; return exposable->width;
} }
@ -106,6 +114,8 @@ expose(const struct exposable *exposable, pixman_image_t *pix, int x, int y, int
const struct glyph *glyph = e->glyphs[i]; const struct glyph *glyph = e->glyphs[i];
assert(glyph != NULL); assert(glyph != NULL);
x += e->kern_x[i];
if (pixman_image_get_format(glyph->pix) == PIXMAN_a8r8g8b8) { if (pixman_image_get_format(glyph->pix) == PIXMAN_a8r8g8b8) {
/* Glyph surface is a pre-rendered image (typically a color emoji...) */ /* Glyph surface is a pre-rendered image (typically a color emoji...) */
pixman_image_composite32( pixman_image_composite32(