borgware-2d/animations/laborlogo.c

#include <stdint.h>
#include <assert.h>
#include "../compat/pgmspace.h"
#include "../random/prng.h"
#include "../util.h"
#include "../autoconf.h"
#include "../pixel.h"

#define PB(a) pgm_read_byte(&(a))

#define BITMAP_WIDTH    48
#define BITMAP_HEIGHT   48

#if NUM_COLS > BITMAP_WIDTH
	#define VIEWPORT_WIDTH BITMAP_WIDTH
#else
	#define VIEWPORT_WIDTH NUM_COLS
#endif

#if NUM_ROWS > BITMAP_HEIGHT
	#define VIEWPORT_HEIGHT BITMAP_HEIGHT
#else
	#define VIEWPORT_HEIGHT NUM_ROWS
#endif

#define XDOMAIN      (BITMAP_WIDTH - VIEWPORT_WIDTH)
#define YDOMAIN      (BITMAP_HEIGHT - VIEWPORT_HEIGHT)

#define CHUNKDOMAIN  (BITMAP_WIDTH - 8)
#define CHUNKCOUNT   (((VIEWPORT_WIDTH - 1) / 8) + 1)

#define FRAME_TICK   75
#define FRAMECOUNT   400


static uint8_t laborlogo_getChunk(const uint8_t x, const uint8_t y)
{
	assert(x <= CHUNKDOMAIN);
	assert(y < BITMAP_HEIGHT);

	static const uint8_t nBitmap[48][6] PROGMEM =
		{{0xFF, 0xFF, 0xE0, 0x07, 0xFF, 0xFF},
		 {0xFF, 0xFF, 0x00, 0xF8, 0xFF, 0xFF},
		 {0xFF, 0xF8, 0x00, 0xFF, 0x1F, 0xFF},
		 {0xFF, 0xF0, 0x00, 0xFF, 0xEF, 0xFF},
		 {0xFF, 0xC0, 0x00, 0xFF, 0xF3, 0xFF},
		 {0xFF, 0x80, 0x00, 0xFF, 0xFD, 0xFF},
		 {0xFF, 0x00, 0x00, 0xFF, 0xFE, 0xFF},
		 {0xFE, 0x00, 0x03, 0x3F, 0xFF, 0x7F},
		 {0xFC, 0x00, 0x04, 0xDF, 0xFF, 0xBF},
		 {0xF8, 0x00, 0x08, 0xEF, 0xFF, 0xDF},
		 {0xF0, 0x00, 0x10, 0xF7, 0xFF, 0xEF},
		 {0xF0, 0x00, 0x10, 0xF7, 0xFF, 0xEF},
		 {0xE0, 0xC0, 0x10, 0xF7, 0xFF, 0xF7},
		 {0xC0, 0xC0, 0x10, 0xF7, 0xFF, 0xFB},
		 {0xC0, 0x40, 0x08, 0xEF, 0xFF, 0xFB},
		 {0xC0, 0x40, 0x04, 0xDF, 0xFF, 0xFB},
		 {0x80, 0x40, 0x03, 0x3F, 0xFF, 0xFD},
		 {0x87, 0xFC, 0x00, 0xFF, 0xFF, 0xFD},
		 {0x84, 0x0C, 0x00, 0xFF, 0xFF, 0xFD},
		 {0x04, 0x00, 0x1F, 0x07, 0xFF, 0xFE},
		 {0x04, 0x00, 0x10, 0xF7, 0xFF, 0xFE},
		 {0x04, 0x00, 0x10, 0xF7, 0xFF, 0xFE},
		 {0xFF, 0x80, 0x10, 0xF7, 0xFF, 0xFE},
		 {0x00, 0x80, 0x10, 0xF7, 0xFF, 0xFE},
		 {0x00, 0x80, 0x10, 0xF7, 0xFF, 0xFE},
		 {0x00, 0x80, 0x10, 0xF7, 0xFF, 0xFE},
		 {0x00, 0x80, 0x10, 0xF7, 0xFF, 0xFE},
		 {0x00, 0x80, 0x10, 0xF7, 0xFF, 0xFE},
		 {0x00, 0x80, 0x10, 0xF7, 0xFF, 0xFE},
		 {0xBF, 0xFC, 0x10, 0xF7, 0xFF, 0xFD},
		 {0xB0, 0x0C, 0x10, 0xF7, 0xFF, 0xFD},
		 {0x80, 0x00, 0x10, 0xF7, 0xFF, 0xFD},
		 {0xC0, 0x00, 0x10, 0xF7, 0xFF, 0xFB},
		 {0xC0, 0x00, 0x10, 0xF7, 0xFF, 0xFB},
		 {0xC0, 0x00, 0x10, 0xF7, 0xFF, 0xFB},
		 {0xE0, 0x00, 0x10, 0xF7, 0xFF, 0xF7},
		 {0xF0, 0x00, 0x10, 0xF7, 0xFF, 0xEF},
		 {0xF0, 0x00, 0x10, 0xF7, 0xFF, 0xEF},
		 {0xF8, 0x00, 0x10, 0xF7, 0xFF, 0xDF},
		 {0xFC, 0x00, 0x10, 0xF7, 0xFF, 0xBF},
		 {0xFE, 0x00, 0x1F, 0x07, 0xFF, 0x7F},
		 {0xFF, 0x00, 0x00, 0xFF, 0xFE, 0xFF},
		 {0xFF, 0x80, 0x00, 0xFF, 0xFD, 0xFF},
		 {0xFF, 0xC0, 0x00, 0xFF, 0xF3, 0xFF},
		 {0xFF, 0xF0, 0x00, 0xFF, 0xEF, 0xFF},
		 {0xFF, 0xF8, 0x00, 0xFF, 0x1F, 0xFF},
		 {0xFF, 0xFF, 0x00, 0xF8, 0xFF, 0xFF},
		 {0xFF, 0xFF, 0xE0, 0x07, 0xFF, 0xFF}};

	uint8_t nChunk;
	uint8_t nAlignment = x % 8;

	if (nAlignment == 0)
	{
		nChunk = PB(nBitmap[y][x / 8]);
	}
	else
	{
		nChunk = PB(nBitmap[y][x / 8]) << nAlignment;
		nChunk |= PB(nBitmap[y][x / 8 + 1]) >> (8 - nAlignment);
	}

	return nChunk;
}


static void laborlogo_drawViewport(const uint8_t nBitmapX,
                                   const uint8_t nBitmapY)
{
	assert(nBitmapX <= XDOMAIN);
	assert(nBitmapY <= YDOMAIN);

	for (int8_t y = 0; y < VIEWPORT_HEIGHT; ++y)
	{
		for (int8_t x = VIEWPORT_WIDTH; x > 0; x -= 8)
		{
			uint8_t nChunk;
			if ((nBitmapX + x - 8) >= 0)
			{
				nChunk = laborlogo_getChunk(nBitmapX + x - 8, nBitmapY + y);
				pixmap[2][y][CHUNKCOUNT - 1 - ((x - 1) / 8)] = nChunk;
			}
			else
			{
				nChunk = laborlogo_getChunk(nBitmapX, nBitmapY + y) >> (8 - x);
				pixmap[2][y][CHUNKCOUNT - 1] = nChunk;
			}
		}
	}
}


static void laborlogo_recalcVector(const int8_t x,
                                   const int8_t y,
                                   int8_t *const pdx,
                                   int8_t *const pdy)
{
	if (((x + *pdx) > (XDOMAIN)) || ((x + *pdx) < 0))
	{
		*pdx = random8() % 2 * (x < (XDOMAIN / 2) ? 1 : -1);
	}
	if (((y + *pdy) > (YDOMAIN)) || ((y + *pdy) < 0))
	{
		*pdy = random8() % 2 * (y < (YDOMAIN / 2) ? 1 : -1);
	}
	if (*pdx == 0 && *pdy == 0)
	{
		*pdx = (x < (XDOMAIN / 2) ? 1 : -1);
		*pdy = (y < (YDOMAIN / 2) ? 1 : -1);
	}
}


void laborlogo()
{
	int8_t x = random8() % (XDOMAIN + 1);
	int8_t y = random8() % (YDOMAIN + 1);
	int8_t dx = 0;
	int8_t dy = 0;

	clear_screen(0);

	for (uint16_t nCycles = FRAMECOUNT; nCycles > 0; --nCycles)
	{
		laborlogo_drawViewport(x, y);
		laborlogo_recalcVector(x, y, &dx, &dy);

#if BITMAP_WIDTH > VIEWPORT_WIDTH
		x += dx;
#endif

#if BITMAP_HEIGHT > VIEWPORT_HEIGHT
		y += dy;
#endif

		wait(FRAME_TICK);
	}
}