1 files changed, 69 insertions, 0 deletions
diff --git a/libskrift_get_cluster_glyph.c b/libskrift_get_cluster_glyph.c
new file mode 100644
index 0000000..e8d5724
--- /dev/null
+++ b/libskrift_get_cluster_glyph.c
@@ -0,0 +1,69 @@
+/* See LICENSE file for copyright and license details. */
+#include "common.h"
+
+/* TODO try normalisation if not found, then try fallback fonts */
+
+ssize_t
+libskrift_get_cluster_glyph(LIBSKRIFT_CONTEXT *ctx, const char *text, struct libskrift_saved_grapheme *saved,
+                            double x, double y, struct libskrift_glyph **glyphp)
+{
+	struct libskrift_glyph *glyph0, *glyph1, *glyph2;
+	uint32_t cp0, cp1;
+	int state = 0;
+	size_t r, len;
+
+	*glyphp = NULL;
+
+	if (saved && saved->cp) {
+		cp0 = saved->cp;
+		len = saved->len;
+	} else {
+		len = grapheme_decode(text, &cp0);
+		if (!len) {
+			errno = EINVAL;
+			return -1;
+		}
+	}
+
+	if (libskrift_get_grapheme_glyph(ctx, cp0, x, y, &glyph0))
+		return -1;
+
+	x += glyph0->advance;
+	for (; cp0; cp0 = cp1, len += r) {
+		r = grapheme_decode(&text[len], &cp1);
+		if (!r) {
+			if (saved) {
+				saved->cp = 0;
+				saved->len = 0;
+			}
+			break;
+		}
+		if (grapheme_boundary(cp0, cp1, &state)) {
+			if (saved) {
+				saved->cp = cp1;
+				saved->len = r;
+			}
+			break;
+		}
+
+		if (libskrift_get_grapheme_glyph(ctx, cp1, x, y, &glyph1)) {
+			free(glyph0);
+			return -1;
+		}
+		x += glyph1->advance;
+
+		if (libskrift_merge_glyphs(ctx, glyph0, glyph1, &glyph2)) {
+			free(glyph0);
+			free(glyph1);
+			return -1;
+		}
+
+		free(glyph0);
+		free(glyph1);
+		glyph0 = glyph2;
+	}
+
+	*glyphp = glyph0;
+
+	return (ssize_t)len;
+}