first working version of uuterm!

- at this point it is purely experimental. only ascii characters are
  visible (using builtin font) although all characters are processed.
- there are known bugs, including crashes.
- there are major missing features.
- but it works. ^_^

1 files changed, 45 insertions, 0 deletions

diff --git a/refresh.c b/refresh.c
new file mode 100644
index 0000000..b1766d2
--- /dev/null
+++ b/refresh.c
@@ -0,0 +1,45 @@
+/* uuterm, Copyright (C) 2006 Rich Felker; licensed under GNU GPL v2 only */
+
+#include "uuterm.h"
+
+static void extract_cell(unsigned *ch, struct uucell *cell)
+{
+	int i;
+	unsigned b;
+	for (b=i=0; i<3; i++) b |= cell->c[i] << 8*i;
+	ch[0] = b;
+	ch -= 2;
+	for (; i<sizeof(cell->c)+1 && cell->c[i]; i++)
+		ch[i] = uu_combine_involution(b, cell->c[i]);
+	if (cell->a & UU_ATTR_UL)
+		ch[i++] = '_'; //0x0332;
+	for (; i<sizeof(cell->c)+1; i++)
+		ch[i] = 0;
+}
+
+const void *ascii_get_glyph(unsigned);
+
+static const void *lookup_glyph(unsigned *this, int i, unsigned *prev, unsigned *next)
+{
+	return ascii_get_glyph(this[i]);
+}
+
+void uuterm_refresh_row(struct uudisp *d, struct uurow *row, int x1, int x2)
+{
+	unsigned ch[4][sizeof(row->cells[0].c)+1];
+	int x, i;
+
+	if (x1) extract_cell(ch[(x1-1)&3], &row->cells[x1-1]);
+	else memset(ch[3], 0, sizeof(ch[3]));
+	extract_cell(ch[x1&3], &row->cells[x1]);
+
+	for (x=x1; x<=x2; x++) {
+		extract_cell(ch[(x+1)&3], &row->cells[x+1]);
+		for (i=0; i<sizeof(ch[0]) && ch[x&3][i]; i++) {
+			const void *glyph = lookup_glyph(ch[x&3], i, ch[(x+3)&3], ch[(x+1)&3]);
+			uudisp_draw_glyph(d, row->idx, x, glyph, row->cells[x].a);
+		}
+	}
+}
+
+