1 files changed, 32 insertions, 0 deletions
diff --git a/src/libdraw/cursor.c b/src/libdraw/cursor.c
new file mode 100644
index 00000000..58f447b1
--- /dev/null
+++ b/src/libdraw/cursor.c
@@ -0,0 +1,32 @@
+#include <u.h>
+#include <libc.h>
+#include <draw.h>
+#include <cursor.h>
+
+static uint8 expand[16] = {
+	0x00, 0x03, 0x0c, 0x0f,
+	0x30, 0x33, 0x3c, 0x3f,
+	0xc0, 0xc3, 0xcc, 0xcf,
+	0xf0, 0xf3, 0xfc, 0xff,
+};
+
+void
+scalecursor(Cursor2 *c2, Cursor *c)
+{
+	int y;
+
+	c2->offset.x = 2*c->offset.x;
+	c2->offset.y = 2*c->offset.y;
+	memset(c2->clr, 0, sizeof c2->clr);
+	memset(c2->set, 0, sizeof c2->set);
+	for(y = 0; y < 16; y++) {
+		c2->clr[8*y] = c2->clr[8*y+4] = expand[c->clr[2*y]>>4];
+		c2->set[8*y] = c2->set[8*y+4] = expand[c->set[2*y]>>4];
+		c2->clr[8*y+1] = c2->clr[8*y+5] = expand[c->clr[2*y]&15];
+		c2->set[8*y+1] = c2->set[8*y+5] = expand[c->set[2*y]&15];
+		c2->clr[8*y+2] = c2->clr[8*y+6] = expand[c->clr[2*y+1]>>4];
+		c2->set[8*y+2] = c2->set[8*y+6] = expand[c->set[2*y+1]>>4];
+		c2->clr[8*y+3] = c2->clr[8*y+7] = expand[c->clr[2*y+1]&15];
+		c2->set[8*y+3] = c2->set[8*y+7] = expand[c->set[2*y+1]&15];
+	}
+}