Font rendering

1 files changed, 42 insertions, 0 deletions

diff --git a/stage3/font.c b/stage3/font.c
new file mode 100644
index 0000000..c9ef520
--- /dev/null
+++ b/stage3/font.c
@@ -0,0 +1,42 @@
+#include "font.h"
+#include "gfx.h"
+
+#define FONT_SIZE 3
+
+static const u16 outer_width  = (CHAR_WIDTH  + 2) * FONT_SIZE;
+static const u16 outer_height = (CHAR_HEIGHT + 2) * FONT_SIZE;
+
+extern u8 letters['z' - 'a' + 1][CHAR_HEIGHT * CHAR_WIDTH];
+
+static u16 line_count = 0;
+
+static void print_chr(u16 at_x, u16 at_y, char c)
+{
+	u16 base_x = at_x * outer_width;
+	u16 base_y = at_y * outer_height;
+
+	gfx_set_area(base_x, base_y, outer_width, outer_height, 0xFF000000);
+
+	if (c > 'z' || c < 'a')
+		return;
+
+	for (u16 x = 0; x < CHAR_WIDTH; x++)
+	for (u16 y = 0; y < CHAR_HEIGHT; y++) {
+		if (!letters[c - 'a'][y * CHAR_WIDTH + x])
+			continue;
+
+		gfx_set_area(
+			base_x + (x + 1) * FONT_SIZE,
+			base_y + (y + 1) * FONT_SIZE,
+			FONT_SIZE, FONT_SIZE, 0xFFFFFFFF);
+	}
+}
+
+void print(char *line)
+{
+	for (u16 x = 0; *line != '\0'; ++x, ++line)
+		print_chr(x, line_count, *line);
+
+	line_count++;
+}
+