added dtx_baseline()

jtsiomb · Jul 3, 2018 · 12794cb · 12794cb
1 parent 7b71866
commit 12794cb
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Showing 3 changed files with 10 additions and 0 deletions.
diff --git a/src/drawtext.h b/src/drawtext.h
@@ -281,6 +281,7 @@ size_t dtx_utf8_from_string(const wchar_t *str, char *buf);
 
 /* ---- metrics ---- */
 float dtx_line_height(void);
+float dtx_baseline(void);
 
 /* rendered dimensions of a single glyph */
 void dtx_glyph_box(int code, struct dtx_box *box);

diff --git a/src/drawtext_impl.h b/src/drawtext_impl.h
@@ -44,6 +44,7 @@ struct dtx_glyphmap {
 	int crange;
 
 	float line_advance;
+	float baseline;
 
 	struct glyph *glyphs;
 	struct dtx_glyphmap *next;

diff --git a/src/font.c b/src/font.c
@@ -341,6 +341,7 @@ struct dtx_glyphmap *dtx_create_glyphmap_range(struct dtx_font *fnt, int sz, int
 	gmap->cend = cend;
 	gmap->crange = cend - cstart;
 	gmap->line_advance = FTSZ_TO_PIXELS((float)face->size->metrics.height);
+	gmap->baseline = -FTSZ_TO_PIXELS((float)face->size->metrics.descender);
 
 	if(!(gmap->glyphs = malloc(gmap->crange * sizeof *gmap->glyphs))) {
 		free(gmap);
@@ -1081,6 +1082,13 @@ float dtx_line_height(void)
 	return gmap->line_advance;
 }
 
+float dtx_baseline(void)
+{
+	struct dtx_glyphmap *gmap = dtx_get_glyphmap(dtx_font, 0);
+
+	return gmap->baseline;
+}
+
 void dtx_glyph_box(int code, struct dtx_box *box)
 {
 	int cidx;