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Converting to integer based math

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This commit is contained in:
Paul Peavyhouse
2019-10-24 16:46:30 -07:00
parent ddd7c1d30c
commit 372b133b18
1 changed files with 16 additions and 15 deletions
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src/lv_misc/lv_color.c
+16 -15
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@@ -113,46 +113,47 @@ lv_color_t lv_color_hsv_to_rgb(uint16_t h, uint8_t s, uint8_t v)
*/
lv_color_hsv_t lv_color_rgb_to_hsv(uint8_t r8, uint8_t g8, uint8_t b8)
{
float r = r8 / 255.0;
float g = g8 / 255.0;
float b = b8 / 255.0;
uint16_t r = ((uint32_t)r8 << 10) / 255;
uint16_t g = ((uint32_t)g8 << 10) / 255;
uint16_t b = ((uint32_t)b8 << 10) / 255;
float rgbMin = r < g ? (r < b ? r : b) : (g < b ? g : b);
float rgbMax = r > g ? (r > b ? r : b) : (g > b ? g : b);
uint16_t rgbMin = r < g ? (r < b ? r : b) : (g < b ? g : b);
uint16_t rgbMax = r > g ? (r > b ? r : b) : (g > b ? g : b);
lv_color_hsv_t hsv;
// https://en.wikipedia.org/wiki/HSL_and_HSV#Lightness
hsv.v = rgbMax * 100 + 0.5;
hsv.v = (100 * rgbMax) >> 10;
float delta = rgbMax - rgbMin;
if (fabs(delta) < 0.009) {
int32_t delta = rgbMax - rgbMin;
if (abs(delta) < 3) {
hsv.h = 0;
hsv.s = 0;
return hsv;
}
// https://en.wikipedia.org/wiki/HSL_and_HSV#Saturation
hsv.s = delta / rgbMax * 100 + 0.5;
if(hsv.s == 0) {
hsv.s = 100 * delta / rgbMax;
if(hsv.s < 3) {
hsv.h = 0;
return hsv;
}
// https://en.wikipedia.org/wiki/HSL_and_HSV#Hue_and_chroma
float h;
int32_t h;
if(rgbMax == r)
h = (g - b) / delta + (g < b ? 6 : 0); // between yellow & magenta
h = (((g - b) << 10) / delta) + (g < b ? (6 << 10) : 0); // between yellow & magenta
else if(rgbMax == g)
h = (b - r) / delta + 2; // between cyan & yellow
h = (((b - r) << 10) / delta) + (2 << 10); // between cyan & yellow
else if(rgbMax == b)
h = (r - g) / delta + 4; // between magenta & cyan
h = (((r - g) << 10) / delta) + (4 << 10); // between magenta & cyan
else
h = 0;
h *= 60;
h >>= 10;
if (h < 0) h += 360;
hsv.h = h + 0.5;
hsv.h = h;
return hsv;
}