My test code is at https://github.com/paulpv/lv_examples/blob/master/lv_tests/lv_test_misc/lv_test_color/lv_test_color.ino
typedef struct {
lv_color_t rgb;
lv_color_hsv_t hsv;
} test_rgb_to_hsv_t;
bool isClose(uint8_t a, uint8_t b, uint8_t d) {
return abs(a - b) <= d;
}
void testRgbToHsvtoRgb() {
/*
* https://en.wikipedia.org/wiki/HSL_and_HSV#Examples
*/
test_rgb_to_hsv_t expected[] = { // H, Shsv, V // https://www.htmlcsscolor.com
{ LV_COLOR_MAKE(0xFF, 0xFF, 0xFF), { 0, 0, 100 } }, // LV_COLOR_WHITE
{ LV_COLOR_MAKE(0x80, 0x80, 0x80), { 0, 0, 50 } }, // LV_COLOR_GRAY
{ LV_COLOR_MAKE(0x00, 0x00, 0x00), { 0, 0, 0 } }, // LV_COLOR_BLACK
{ LV_COLOR_MAKE(0xFF, 0x00, 0x00), { 0, 100, 100 } }, // LV_COLOR_RED
{ LV_COLOR_MAKE(0xBF, 0xBF, 0x00), { 60, 100, 75 } }, // "La Rioja"
{ LV_COLOR_MAKE(0x00, 0x80, 0x00), { 120, 100, 50 } }, // LV_COLOR_GREEN
{ LV_COLOR_MAKE(0x80, 0xFF, 0xFF), { 180, 50, 100 } }, // "Electric Blue"
{ LV_COLOR_MAKE(0x80, 0x80, 0xFF), { 240, 50, 100 } }, // "Light Slate Blue"
{ LV_COLOR_MAKE(0xBF, 0x40, 0xBF), { 300, 67, 75 } }, // "Fuchsia"
{ LV_COLOR_MAKE(0xA0, 0xA4, 0x24), { 62, 78, 64 } }, // "Lucky"
{ LV_COLOR_MAKE(0x41, 0x1B, 0xEA), { 251, 89, 92 } }, // "Han Purple"
{ LV_COLOR_MAKE(0x1E, 0xAC, 0x41), { 135, 83, 68 } }, // "Dark Pastel Green"
{ LV_COLOR_MAKE(0xF0, 0xC8, 0x0E), { 50, 94, 94 } }, // "Moon Yellow"
{ LV_COLOR_MAKE(0xB4, 0x30, 0xE5), { 284, 79, 90 } }, // "Dark Orchid"
{ LV_COLOR_MAKE(0xED, 0x76, 0x51), { 14, 66, 93 } }, // "Burnt Sienna"
{ LV_COLOR_MAKE(0xFE, 0xF8, 0x88), { 57, 47, 100 } }, // "Milan"
{ LV_COLOR_MAKE(0x19, 0xCB, 0x97), { 162, 88, 80 } }, // "Caribbean Green"
{ LV_COLOR_MAKE(0x36, 0x26, 0x98), { 248, 75, 60 } }, // "Dark Slate Blue"
{ LV_COLOR_MAKE(0x7E, 0x7E, 0xB8), { 241, 32, 72 } }, // "Moody Blue"
};
int test_count = sizeof(expected) / sizeof(expected[0]);
for(int i=0; i < test_count; i++) {
test_rgb_to_hsv_t rgb_to_hsv = expected[i];
lv_color_t colorRgbExpected = rgb_to_hsv.rgb;
lv_color_hsv_t colorHsvExpected = rgb_to_hsv.hsv;
Serial.printf("testRgbToHsvtoRgb: colorRgbExpected=0x%08X, colorHsvExpected={ %d, %d, %d }\n", colorRgbExpected, colorHsvExpected.h, colorHsvExpected.s, colorHsvExpected.v);
//
// RGB to HSV
//
lv_color_hsv_t colorHsvActual = lv_color_to_hsv(colorRgbExpected);
Serial.printf("testRgbToHsvtoRgb: colorHsvActual={ %d, %d, %d }\n", colorHsvActual.h, colorHsvActual.s, colorHsvActual.v);
if (!isClose(colorHsvActual.h, colorHsvExpected.h, 3) ||
!isClose(colorHsvActual.s, colorHsvExpected.s, 3) ||
!isClose(colorHsvActual.v, colorHsvExpected.v, 3)) {
Serial.println("testRgbToHsvtoRgb: FAIL!");
break;
}
//
// HSV to RGB
//
lv_color_t colorRgbActual = lv_color_hsv_to_rgb(colorHsvExpected.h, colorHsvExpected.s, colorHsvExpected.v);
Serial.printf("testRgbToHsvtoRgb: colorRgbActual=0x%08X\n", colorRgbActual);
if (!isClose(colorRgbActual.ch.red, colorRgbExpected.ch.red, 3) ||
!isClose(colorRgbActual.ch.green, colorRgbExpected.ch.green, 3) ||
!isClose(colorRgbActual.ch.blue, colorRgbExpected.ch.blue, 3)) {
Serial.println("testRgbToHsvtoRgb: FAIL!");
break;
}
}
Serial.println("testRgbToHsvtoRgb: PASS!");
}
