diff options
| author | Jesse Morgan <jesse@jesterpm.net> | 2011-10-20 22:16:19 -0700 |
|---|---|---|
| committer | Jesse Morgan <jesse@jesterpm.net> | 2011-10-20 22:16:19 -0700 |
| commit | fc944ff979dbbd49a57722fe2d1d2acf47312eb4 (patch) | |
| tree | 38cc3a5c5c8f24f55068fc4ffa73d018169fc2df /libraries/Sprite/Sprite.cpp | |
Inital commit... halfway through the project
Diffstat (limited to 'libraries/Sprite/Sprite.cpp')
| -rw-r--r-- | libraries/Sprite/Sprite.cpp | 95 |
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..21c90e9 --- /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;
+}
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