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