1 files changed, 97 insertions, 0 deletions
diff --git a/libstorycode/render_cairo_common.c b/libstorycode/render_cairo_common.c
new file mode 100644
index 0000000..b3883c9
--- /dev/null
+++ b/libstorycode/render_cairo_common.c
@@ -0,0 +1,97 @@
+/*
+ * render_cairo_common.c
+ *
+ * Copyright © 2019 Thomas White <taw@bitwiz.org.uk>
+ *
+ * This file is part of Colloquium.
+ *
+ * Colloquium is free software: you can redistribute it and/or modify
+ * it under the terms of the GNU General Public License as published by
+ * the Free Software Foundation, either version 3 of the License, or
+ * (at your option) any later version.
+ *
+ * This program is distributed in the hope that it will be useful,
+ * but WITHOUT ANY WARRANTY; without even the implied warranty of
+ * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
+ * GNU General Public License for more details.
+ *
+ * You should have received a copy of the GNU General Public License
+ * along with this program.  If not, see <http://www.gnu.org/licenses/>.
+ *
+ */
+
+
+#ifdef HAVE_CONFIG_H
+#include <config.h>
+#endif
+
+#include <string.h>
+#include <stdio.h>
+#include <pango/pango.h>
+
+#include "storycode.h"
+
+int runs_to_pangolayout(PangoLayout *layout, struct text_run *runs, int n_runs)
+{
+	size_t total_len = 0;
+	int i;
+	char *text;
+	PangoAttrList *attrs;
+
+	attrs = pango_layout_get_attributes(layout);
+
+	/* Work out length of all text in item (paragraph) */
+	for ( i=0; i<n_runs; i++ ) {
+		total_len += strlen(runs[i].text);
+	}
+
+	/* Allocate the complete text */
+	text = malloc(total_len+1);
+	if ( text == NULL ) {
+		fprintf(stderr, "Couldn't allocate combined text (%lli)\n",
+		       (long long int)total_len);
+		return 1;
+	}
+
+	/* Put all of the text together */
+	text[0] = '\0';
+	size_t pos = 0;
+	for ( i=0; i<n_runs; i++ ) {
+
+		PangoAttribute *attr = NULL;
+		size_t run_len = strlen(runs[i].text);
+
+		switch ( runs[i].type ) {
+
+			case TEXT_RUN_NORMAL :
+			break;
+
+			case TEXT_RUN_BOLD:
+			attr = pango_attr_weight_new(PANGO_WEIGHT_BOLD);
+			break;
+
+			case TEXT_RUN_ITALIC:
+			attr = pango_attr_style_new(PANGO_STYLE_ITALIC);
+			break;
+
+			case TEXT_RUN_UNDERLINE:
+			attr = pango_attr_underline_new(PANGO_UNDERLINE_SINGLE);
+			break;
+
+		}
+
+		if ( attr != NULL ) {
+			attr->start_index = pos;
+			attr->end_index = pos + run_len;
+			pango_attr_list_insert(attrs, attr);
+		}
+
+		/* FIXME: Should check that each bit of text finishes on a character boundary */
+		pos += run_len;
+		strcat(text, runs[i].text);
+
+	}
+	pango_layout_set_text(layout, text, -1);
+
+	return 0;
+}