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TwatchChalice
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Built-in foreground color selection 

Now that I'm doing it in the right order, it turns out the built-in function for picking a legible foreground color works just dandy. Pulled my custom function back out and using that.
This commit is contained in:
Neale Pickett 2016-05-10 20:25:53 -06:00
parent e5b1670958
commit a23fed6fbe
1 changed files with 1 additions and 16 deletions
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17
src/main.c
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@ -20,20 +20,6 @@ GPoint center;
bool bt_connected; bool bt_connected;
static GColor8 visible_against(GColor8 bg) {
uint8_t r = (bg.argb >> 4) & 0b11;
uint8_t g = (bg.argb >> 2) & 0b11;
uint8_t b = (bg.argb >> 0) & 0b11;
uint16_t a = (299*r + 587*g + 114*b);
// Counting the perceptive luminance - human eye favors green color...
if (a < 1500) {
return GColorWhite;
} else {
return GColorBlack;
}
}
static GPoint point_of_polar(int32_t theta, int r) { static GPoint point_of_polar(int32_t theta, int r) {
GPoint ret = { GPoint ret = {
.x = (int16_t)(sin_lookup(theta) * r / TRIG_MAX_RATIO) + center.x, .x = (int16_t)(sin_lookup(theta) * r / TRIG_MAX_RATIO) + center.x,
@ -186,11 +172,10 @@ static void init() {
argb = rand() % 0b00111111; argb = rand() % 0b00111111;
} }
accent_color = (GColor8){ .argb = argb + 0b11000000 }; accent_color = (GColor8){ .argb = argb + 0b11000000 };
text_color = visible_against(accent_color);
#else #else
accent_color = GColorWhite; accent_color = GColorWhite;
text_color = GColorBlack;
#endif #endif
text_color = gcolor_legible_over(accent_color);
s_day_buffer[0] = '\0'; s_day_buffer[0] = '\0';