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PROGMEMed invader sprite, optimized some shifting foo - saving 106 bytes

This commit is contained in:
Christian Kroll 2010-12-22 23:19:40 +00:00
parent 3708a3accc
commit d199d48abd
1 changed files with 15 additions and 12 deletions
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27
animations/stonefly.c
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@ -1,6 +1,7 @@
#include <stdlib.h>
#include <inttypes.h>
#include "../config.h"
#include "../compat/pgmspace.h"
#include "../random/prng.h"
#include "../pixel.h"
#include "../games/tetris/piece.h"
@ -19,7 +20,7 @@
010000010 0x0082
*/
uint16_t invader[] = {0x0044, 0x017D, 0x01BB, 0x00FE, 0x0082};
static uint16_t const invader[] PROGMEM = {0x0044, 0x017D, 0x01BB, 0x00FE, 0x0082};
#define INV_HEIGHT (sizeof(invader) / sizeof(uint16_t))
@ -33,12 +34,12 @@ typedef struct
} stone_t;
//forward decls (not drunk yet!)
void create_stone(stone_t *stone);
void draw_stone(stone_t *stone);
//void create_stone(stone_t *stone);
//void draw_stone(stone_t *stone);
//create a stone at a random x pos
void create_stone(stone_t *stone)
static void create_stone(stone_t *stone)
{
//create stone at top position
stone->y = 0;
@ -64,42 +65,42 @@ void draw_stone(stone_t *stone)
{
uint8_t y, x, ydraw;
uint16_t nPieceMap = tetris_piece_getBitmap(&stone->piece);
uint16_t pieceLala;
for(y = 0; y < 4; y++)
{
// clear all bits of the piece we are not interested in and
// align the remaining row to LSB
// -> translates to: get the correct row out of the bitmap and right-align
pieceLala = (nPieceMap & (0x000F << (y << 2)) ) >> (y << 2);
// shift bitmap line to current x pos (this can be done faster... BUT I WANT IT SO!)
pieceLala <<= stone->x;
uint16_t pieceLala = (nPieceMap & 0x000F) << stone->x;
nPieceMap >>= 4;
//DRUUUUUUUUUUUWWWWWWWWWWWWWWW!!!!!!!!!!! eerrr /U/A/s
ydraw = (stone->y / YSCALE) + y;
if((ydraw < (NUM_ROWS + 4)) && (ydraw > 3)) //drawing begins @ 3, to make piece of height 4 scroll in
{
uint16_t mask = 0x0001;
for (x = 0; x < 16; ++x)
{
if(pieceLala & (1 << x))
if(pieceLala & mask)
{
setpixel((pixel){ x, ydraw - 4 }, stone->color);
}
mask <<= 1;
}
}
}
}
void draw_invader(uint8_t ypos, uint8_t xpos)
static void draw_invader(uint8_t ypos, uint8_t xpos)
{
uint8_t y, x, ydraw;
uint16_t pieceLala;
for(y = 0; y < INV_HEIGHT; y++)
{
pieceLala = invader[y];
pieceLala = pgm_read_word(&invader[y]);
// shift bitmap line to current x pos (this is nonsense overhead... BUT I LIKE IT!)
pieceLala <<= xpos;
@ -108,12 +109,14 @@ void draw_invader(uint8_t ypos, uint8_t xpos)
ydraw = (ypos / 2) + y;
if((ydraw < (NUM_ROWS + INV_HEIGHT)) && (ydraw > (INV_HEIGHT - 1))) //drawing begins @ 5, to make invader of height 6 scroll in
{
uint16_t mask = 0x0001;
for (x = 0; x < 16; ++x)
{
if(pieceLala & (1 << x))
if(pieceLala & mask)
{
setpixel((pixel){ x, ydraw - INV_HEIGHT }, 1);
}
mask <<= 1;
}
}
}