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optimize ssd1306_fill_rectangle

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This commit is contained in:
Olli Asikainen 2020-04-24 16:31:05 +03:00
parent bc979883c2
commit cc24111c05
1 changed files with 52 additions and 6 deletions
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58
extras/ssd1306/ssd1306.c
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@ -692,12 +692,58 @@ int ssd1306_draw_rectangle(const ssd1306_t *dev, uint8_t *fb, int8_t x, int8_t y
int ssd1306_fill_rectangle(const ssd1306_t *dev, uint8_t *fb, int8_t x, int8_t y, uint8_t w, uint8_t h, ssd1306_color_t color) int ssd1306_fill_rectangle(const ssd1306_t *dev, uint8_t *fb, int8_t x, int8_t y, uint8_t w, uint8_t h, ssd1306_color_t color)
{ {
// Can be optimized? uint16_t index;
uint8_t i; uint8_t fill, mask, mod, t;
int err = 0;
for (i = x; i < x + w; ++i) // boundary check
if ((err = ssd1306_draw_vline(dev, fb, i, y, h, color))) if ((x >= dev->width) || (x < 0) || (y >= dev->height) || (y < 0))
return err; return -EINVAL;
if (w == 0 || h == 0)
return -EINVAL;
if (x + w > dev->width)
w = dev->width - x;
if (y + h > dev->height)
h = dev->height - y;
do {
mod = y & 7;
fill = 8 - mod;
if (fill > h)
fill = h;
t = w;
index = x + (y / 8) * dev->width;
mask = ((1 << fill) - 1) << mod;
switch (color) {
case OLED_COLOR_WHITE:
while (t--) {
fb[index] |= mask;
++index;
}
break;
case OLED_COLOR_BLACK:
mask = ~mask;
while (t--) {
fb[index] &= mask;
++index;
}
break;
case OLED_COLOR_INVERT:
while (t--) {
fb[index] ^= mask;
++index;
}
break;
default:
break;
}
y += fill;
h -= fill;
} while(h > 0);
return 0; return 0;
} }