tools/libtxt/: add rendering of (compiled) edits (untested, WIP)

tools/libtxt/Makefile

@@ -15,7 +15,7 @@ MAIN = libtxt.a
 
 CFLAGS = -g -Wall
 
-OBJS = font.o
+OBJS = edit.o font.o
 
 .PHONY:		all clean spotless
 

tools/libtxt/font.c

@@ -277,6 +277,19 @@ int draw_char(void *canvas, int width, int height,
 }
 
 
+int char_height(const struct font *font, char c)
+{
+	const char *cp;
+	const struct sym *sym;
+
+	cp = strchr(charset, c);
+	if (!cp)
+		return 0;
+	sym = font->sym+(cp-charset);
+	return sym->h;
+}
+
+
 /* ----- Testing ----------------------------------------------------------- */
 
 

tools/libtxt/libtxt.h

@@ -13,15 +13,20 @@
 #ifndef LIBTXT_H
 #define LIBTXT_H
 
+struct image;
+
+struct font;
 
 struct edit {
 	enum edit_type {
 		edit_string,
 		edit_font,
+		edit_spc,
 		edit_xoff,
 		edit_xpos,
 		edit_yoff,
 		edit_ypos,
+		edit_nl,
 	} type;
 	union {
 		const char *s;
@@ -35,6 +40,7 @@ struct edit {
  *
  * <FONT fontname>
  * <IMG imagefile>
+ * <SPC offset>
  * <X+offset> <X-offset> <X=pos>
  * <Y+offset> ...
  *
@@ -52,10 +58,12 @@ void free_font(struct font *font);
 
 int draw_char(void *canvas, int width, int height,
     const struct font *font, char c, int x, int y);
+int char_height(const struct font *font, char c);
 
 struct edit *text2edit(const char *s);
 char *edit2text(const struct edit *e);
 
-void *apply_edits(int width, int height, const struct edit *e);
+void *apply_edits(int width, int height, const struct edit *e,
+    const char **error);
 
 #endif /* !LIBTXT_H */