Differential D596 Diff 1959 source/blender/blenlib/intern/math_color.c

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source/blender/blenlib/intern/math_color.c

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	void hsv_to_rgb(float h, float s, float v, float r, float g, float *b)	void hsv_to_rgb(float h, float s, float v, float r, float g, float *b)
	{	{
	if (s != 0.0f) {	float nr, ng, nb;
	float i, f, p;
	h = (h - floorf(h)) * 6.0f;

	i = floorf(h);
	f = h - i;

	/* avoid computing q/t when not needed */
	p = (v * (1.0f - s));
	#define q (v * (1.0f - (s * f)))
	#define t (v * (1.0f - (s * (1.0f - f))))

	/* faster to compare floats then int conversion */
	if (i < 1.0f) {
	*r = v;
	*g = t;
	*b = p;
	}
	else if (i < 2.0f) {
	*r = q;
	*g = v;
	*b = p;
	}
	else if (i < 3.0f) {
	*r = p;
	*g = v;
	*b = t;
	}
	else if (i < 4.0f) {
	*r = p;
	*g = q;
	*b = v;
	}
	else if (i < 5.0f) {
	*r = t;
	*g = p;
	*b = v;
	}
	else {
	*r = v;
	*g = p;
	*b = q;
	}

	#undef q	nr = (float) fabsf(h * 6.0f - 3.0f) - 1.0f;
	#undef t	ng = 2.0f - (float) fabsf(h * 6.0f - 2.0f);
		nb = 2.0f - (float) fabsf(h * 6.0f - 4.0f);

	}	CLAMP(nr, 0.0f, 1.0f);
	else {	CLAMP(nb, 0.0f, 1.0f);
	*r = v;	CLAMP(ng, 0.0f, 1.0f);
	*g = v;
	*b = v;	r = ((nr - 1.0f) s + 1.0f) * v;
	}	g = ((ng - 1.0f) s + 1.0f) * v;
		b = ((nb - 1.0f) s + 1.0f) * v;
	}	}

	/* HSL to rgb conversion from https://en.wikipedia.org/wiki/HSL_and_HSV */
	void hsl_to_rgb(float h, float s, float l, float r, float g, float *b)	void hsl_to_rgb(float h, float s, float l, float r, float g, float *b)
	{	{
	float i, f, c;	float nr, ng, nb, chroma;
		campbellbartonUnsubmitted Not Done Inline Actions picky, prefer all lowercase names, also C is used for context. campbellbarton: picky, prefer all lowercase names, also C is used for context.
	h = (h - floorf(h)) * 6.0f;
	c = (l > 0.5f) ? (2.0f * (1.0f - l) * s) : (2.0f * l * s);
	i = floorf(h);
	f = h - i;

	#define x2 (c * f)	nr = (float) fabsf(h * 6.0f - 3.0f) - 1.0f;
	#define x1 (c * (1.0f - f))	ng = 2.0f - (float) fabsf(h * 6.0f - 2.0f);
		nb = 2.0f - (float) fabsf(h * 6.0f - 4.0f);
		campbellbartonUnsubmitted Not Done Inline Actions should use `fabsf` campbellbarton: should use `fabsf`

	/* faster to compare floats then int conversion */	CLAMP(nr, 0.0f, 1.0f);
	if (i < 1.0f) {	CLAMP(nb, 0.0f, 1.0f);
	*r = c;	CLAMP(ng, 0.0f, 1.0f);
	*g = x2;
	*b = 0;
	}
	else if (i < 2.0f) {
	*r = x1;
	*g = c;
	*b = 0;
	}
	else if (i < 3.0f) {
	*r = 0;
	*g = c;
	*b = x2;
	}
	else if (i < 4.0f) {
	*r = 0;
	*g = x1;
	*b = c;
	}
	else if (i < 5.0f) {
	*r = x2;
	*g = 0;
	*b = c;
	}
	else {
	*r = c;
	*g = 0;
	*b = x1;
	}

	#undef x1	chroma = (1.0f - (float) fabsf(2.0f * l - 1.0f)) * s;
	#undef x2

	f = l - 0.5f * c;	r = (nr - 0.5f) chroma + l;
	*r += f;	g = (ng - 0.5f) chroma + l;
	*g += f;	b = (nb - 0.5f) chroma + l;
	*b += f;
	}	}

	/* convenience function for now */	/* convenience function for now */
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	void rgb_to_hsv(float r, float g, float b, float lh, float ls, float *lv)	void rgb_to_hsv(float r, float g, float b, float lh, float ls, float *lv)
	{	{
	float h, s, v;	float K = 0.0f;
	float cmax, cmin;	float chroma;

	cmax = r;	if (g < b) {
	cmin = r;	SWAP(float, g, b);
	cmax = (g > cmax ? g : cmax);	K = -1.0f;
	cmin = (g < cmin ? g : cmin);
	cmax = (b > cmax ? b : cmax);
	cmin = (b < cmin ? b : cmin);

	v = cmax; /* value */
	if (cmax != 0.0f) {
	float cdelta;

	cdelta = cmax - cmin;
	s = cdelta / cmax;

	if (s != 0.0f) {
	float rc, gc, bc;

	rc = (cmax - r) / cdelta;
	gc = (cmax - g) / cdelta;
	bc = (cmax - b) / cdelta;

	if (r == cmax) {
	h = bc - gc;
	if (h < 0.0f) {
	h += 6.0f;
	}
	}
	else if (g == cmax) {
	h = 2.0f + rc - bc;
	}
	else {
	h = 4.0f + gc - rc;
	}

	h *= (1.0f / 6.0f);
	}
	else {
	h = 0.0f;
	}
	}	}
	else {	if (r < g) {
	h = 0.0f;	SWAP(float, r, g);
	s = 0.0f;	K = -2.0f * 6e-1f - K;
	}	}

	*lh = h;	chroma = r - min_ff(g, b);
	*ls = s;
	*lv = v;	lh = (float) fabsf(K + (g - b) / (6.0f chroma + 1e-20f));
		*ls = chroma / (r + 1e-20f);
		*lv = r;
	}	}

	/* convenience function for now */	/* convenience function for now */
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