1 files changed, 95 insertions, 0 deletions
diff --git a/libraries/Sprite/Sprite.cpp b/libraries/Sprite/Sprite.cpp
new file mode 100644
index 0000000..6055876
--- /dev/null
+++ b/libraries/Sprite/Sprite.cpp
@@ -0,0 +1,95 @@
+/*
+  Sprite.cpp - 2D sprite buffer library for Arduino & Wiring
+  Copyright (c) 2006 David A. Mellis.  All right reserved.
+
+  This library is free software; you can redistribute it and/or
+  modify it under the terms of the GNU Lesser General Public
+  License as published by the Free Software Foundation; either
+  version 2.1 of the License, or (at your option) any later version.
+
+  This library is distributed in the hope that it will be useful,
+  but WITHOUT ANY WARRANTY; without even the implied warranty of
+  MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the GNU
+  Lesser General Public License for more details.
+
+  You should have received a copy of the GNU Lesser General Public
+  License along with this library; if not, write to the Free Software
+  Foundation, Inc., 51 Franklin St, Fifth Floor, Boston, MA  02110-1301  USA
+*/
+
+#include <stdlib.h>
+#include <stdarg.h>
+//#include <stdio.h>
+
+#include "Sprite.h"
+
+void Sprite::init(uint8_t width, uint8_t height)
+{
+  _width = width >= 8 ? 8 : width;
+  _height = height >= 8 ? 8 : height;
+
+  // for now, do nothing if this allocation fails.  methods that require it
+  // should silently fail if _buffer is null.
+  _buffer = (uint8_t *) calloc(_height, 1);
+}
+  
+Sprite::Sprite(uint8_t width, uint8_t height)
+{
+  init(width, height);
+}
+
+Sprite::Sprite(uint8_t width, uint8_t height, uint8_t row, ...)
+{
+  init(width, height);
+  
+  if (!_buffer) return;
+  
+  va_list ap;
+  va_start(ap, row);
+
+  int y = 0;
+  
+  for (y = 0; ; y++) {
+    for (int x = 0; x < width && x < 8; x++)
+      write(x, y, (row >> (width - x - 1)) & 0x01);
+    
+    if (y == height - 1)
+      break;
+      
+    row = va_arg(ap, int); // using '...' promotes uint8_t to int
+  }
+  
+  va_end(ap);
+}
+
+uint8_t Sprite::width() const
+{
+  return _width;
+}
+
+uint8_t Sprite::height() const
+{
+  return _height;
+}
+
+void Sprite::write(uint8_t x, uint8_t y, uint8_t value)
+{
+  if (!_buffer) return;
+  
+  // uint8_t's can't be negative, so don't test for negative x and y.
+  if (x >= _width || y >= _height) return;
+  
+  // we need to bitwise-or the value of the other pixels in the byte with
+  // the new value, masked and shifted into the proper bits.
+  _buffer[y] = (_buffer[y] & ~(0x01 << x)) | ((value & 0x01) << x);
+}
+
+uint8_t Sprite::read(uint8_t x, uint8_t y) const
+{
+  if (!_buffer) return 0;
+  
+  // uint8_t's can't be negative, so don't test for negative x and y.
+  if (x >= _width || y >= _height) return 0;
+  
+  return (_buffer[y] >> x) & 0x01;
+}