1 files changed, 109 insertions, 0 deletions
diff --git a/linux/tile/box.mu b/linux/tile/box.mu
new file mode 100644
index 00000000..859d0b8e
--- /dev/null
+++ b/linux/tile/box.mu
@@ -0,0 +1,109 @@
+fn draw-box screen: (addr screen), row1: int, col1: int, row2: int, col2: int {
+  draw-horizontal-line screen, row1, col1, col2
+  draw-vertical-line screen, row1, row2, col1
+  draw-horizontal-line screen, row2, col1, col2
+  draw-vertical-line screen, row1, row2, col2
+  draw-top-left-corner screen, row1, col1
+  draw-top-right-corner screen, row1, col2
+  draw-bottom-left-corner screen, row2, col1
+  draw-bottom-right-corner screen, row2, col2
+}
+
+fn draw-hatching screen: (addr screen), row1: int, col1: int, row2: int, col2: int {
+  var c/eax: int <- copy col1
+  var r1/ecx: int <- copy row1
+  r1 <- increment
+  c <- add 2
+  {
+    compare c, col2
+    break-if->=
+    draw-vertical-line screen, r1, row2, c
+    c <- add 2
+    loop
+  }
+}
+
+fn draw-horizontal-line screen: (addr screen), row: int, col1: int, col2: int {
+  var col/eax: int <- copy col1
+  move-cursor screen, row, col
+  {
+    compare col, col2
+    break-if->=
+    print-code-point screen, 0x2500
+    col <- increment
+    loop
+  }
+}
+
+fn draw-vertical-line screen: (addr screen), row1: int, row2: int, col: int {
+  var row/eax: int <- copy row1
+  {
+    compare row, row2
+    break-if->=
+    move-cursor screen, row, col
+    print-code-point screen, 0x2502
+    row <- increment
+    loop
+  }
+}
+
+fn draw-top-left-corner screen: (addr screen), row: int, col: int {
+  move-cursor screen, row, col
+  print-code-point screen, 0x250c
+}
+
+fn draw-top-right-corner screen: (addr screen), row: int, col: int {
+  move-cursor screen, row, col
+  print-code-point screen, 0x2510
+}
+
+fn draw-bottom-left-corner screen: (addr screen), row: int, col: int {
+  move-cursor screen, row, col
+  print-code-point screen, 0x2514
+}
+
+fn draw-bottom-right-corner screen: (addr screen), row: int, col: int {
+  move-cursor screen, row, col
+  print-code-point screen, 0x2518
+}
+
+# erase parts of screen the slow way
+fn clear-rect screen: (addr screen), row1: int, col1: int, row2: int, col2: int {
+  var i/eax: int <- copy row1
+  {
+    compare i, row2
+    break-if->
+    var j/ecx: int <- copy col1
+    move-cursor screen, i, j
+    {
+      compare j, col2
+      break-if->
+      print-grapheme screen 0x20/space
+      j <- increment
+      loop
+    }
+    i <- increment
+    loop
+  }
+}
+
+fn clear-rect2 screen: (addr screen), row1: int, col1: int, w: int, h: int {
+  var i/eax: int <- copy 0
+  var curr-row/esi: int <- copy row1
+  {
+    compare i, w
+    break-if->=
+    move-cursor screen, curr-row, col1
+    var j/ecx: int <- copy 0
+    {
+      compare j, h
+      break-if->=
+      print-grapheme screen 0x20/space
+      j <- increment
+      loop
+    }
+    i <- increment
+    curr-row <- increment
+    loop
+  }
+}