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save flash through image compression

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For default make configuration, 574 bytes saved with primitive
compression algorithm.
This commit is contained in:
mihlit@mihlit.cz
2012-05-24 20:33:35 +00:00
parent c1e61fdd38
commit 6a0114d612
9 changed files with 75 additions and 27 deletions
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src/lcd.cpp
+11 -1
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@@ -54,12 +54,22 @@ void lcd_img(uint8_t x, uint8_t y, const pm_uchar * img, uint8_t idx, uint8_t mo
const pm_uchar *q = img;
uint8_t w = pgm_read_byte(q++);
uint8_t hb = (pgm_read_byte(q++)+7)/8;
bool comp = pgm_read_byte(q++);
bool inv = (mode & INVERS) ? true : (mode & BLINK ? BLINK_ON_PHASE : false);
q += idx*w*hb;
uint8_t ocur=0, b;
for (uint8_t yb = 0; yb < hb; yb++) {
uint8_t *p = &displayBuf[ (y / 8 + yb) * DISPLAY_W + x ];
for (uint8_t i=0; i<w; i++){
uint8_t b = pgm_read_byte(q++);
if (ocur==0)
{
b = pgm_read_byte(q++);
if (comp && b==0xf0)
{
b = pgm_read_byte(q++);
ocur = pgm_read_byte(q++)-1;
}
} else ocur--;
*p++ = inv ? ~b : b;
}
}