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Faster & smaller screen_dump() function, saving almost 1.8 KB of ram

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git-svn-id: svn://svn.rockbox.org/rockbox/trunk@5037 a1c6a512-1295-4272-9138-f99709370657
This commit is contained in:
Jens Arnold 2004-09-03 22:24:29 +00:00
parent 862f729331
commit 0f04656325
1 changed files with 32 additions and 41 deletions
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71
apps/misc.c
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@ -124,59 +124,50 @@ static const unsigned char bmpheader[] =
0x00, 0x00 0x00, 0x00
}; };
static unsigned char buf[112*8];
static unsigned char buf2[112*8];
static const char dummy[2] = {0, 0};
void screen_dump(void) void screen_dump(void)
{ {
int f; int fh;
int i, shift; int bx, by, ix, iy;
int x, y; int src_byte, src_mask, dst_mask;
char filename[MAX_PATH]; char filename[MAX_PATH];
static unsigned char line_block[8][16];
struct tm *tm = get_time(); struct tm *tm = get_time();
i = 0;
for(y = 0;y < LCD_HEIGHT/8;y++)
{
for(x = 0;x < LCD_WIDTH;x++)
{
buf[i++] = lcd_framebuffer[y][x];
}
}
memset(buf2, 0, sizeof(buf2));
for(y = 0;y < 64;y++)
{
shift = y & 7;
for(x = 0;x < 112/8;x++)
{
for(i = 0;i < 8;i++)
{
buf2[y*112/8+x] |= ((buf[y/8*112+x*8+i] >> shift)
& 0x01) << (7-i);
}
}
}
snprintf(filename, MAX_PATH, "/dump %04d-%02d-%02d %02d-%02d-%02d.bmp", snprintf(filename, MAX_PATH, "/dump %04d-%02d-%02d %02d-%02d-%02d.bmp",
tm->tm_year+1900, tm->tm_mon+1, tm->tm_mday, tm->tm_year+1900, tm->tm_mon+1, tm->tm_mday,
tm->tm_hour, tm->tm_min, tm->tm_sec); tm->tm_hour, tm->tm_min, tm->tm_sec);
f = creat(filename, O_WRONLY);
if(f >= 0)
{
write(f, bmpheader, sizeof(bmpheader));
for(i = 63;i >= 0;i--) fh = creat(filename, O_WRONLY);
if (fh < 0)
return;
write(fh, bmpheader, sizeof(bmpheader));
/* BMP image goes bottom up */
for (by = LCD_HEIGHT/8 - 1; by >= 0; by--)
{
memset(&line_block[0][0], 0, 8*16);
for (bx = 0; bx < LCD_WIDTH/8; bx++)
{ {
write(f, &buf2[i*14], 14); dst_mask = 0x01;
write(f, dummy, 2); for (ix = 7; ix >= 0; ix--)
{
src_byte = lcd_framebuffer[by][8*bx+ix];
src_mask = 0x01;
for (iy = 7; iy >= 0; iy--)
{
if (src_byte & src_mask)
line_block[iy][bx] |= dst_mask;
src_mask <<= 1;
}
dst_mask <<= 1;
}
} }
close(f); write(fh, &line_block[0][0], 8*16);
} }
close(fh);
} }
#endif #endif