You cannot select more than 25 topics
Topics must start with a letter or number, can include dashes ('-') and can be up to 35 characters long.
96 lines
2.4 KiB
C++
96 lines
2.4 KiB
C++
/*
|
|
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;
|
|
}
|